Multiband analyses of the bright GRB 230812B and the associated SN2023pel

T. Hussenot-Desenonges; T. Wouters; N. Guessoum; I. Abdi; A. Abulwfa; C. Adami; J. F. Agüí Fernández; T. Ahumada; V. Aivazyan; D. Akl; S. Anand; C. M. Andrade; S. Antier; S. A. Ata; P. D'Avanzo; Y. A. Azzam; A. Baransky; S. Basa; M. Blazek; P. Bendjoya; S. Beradze; P. Boumis; M. Bremer; R. Brivio; V. Buat; M. Bulla; O. Burkhonov; E. Burns; S. B. Cenko; M. W. Coughlin; W. Corradi; F. Daigne; T. Dietrich; D. Dornic; J. G. Ducoin; P. A. Duverne; E. G. Elhosseiny; F. I. Elnagahy; M. A. El-Sadek; M. Ferro; E. Le Floc'H; M. Freeberg; J. P.U. Fynbo; D. Götz; E. Gurbanov; G. M. Hamed; E. Hasanov; B. F. Healy; K. E. Heintz; P. Hello; R. Inasaridze; A. Iskandar; N. Ismailov; L. Izzo; S. Jhawar; T. Jegou du Laz; T. M. Kamel; S. Karpov; A. Klotz; E. Koulouridis; N. P. Kuin; N. Kochiashvili; S. Leonini; K. X. Lu; D. B. Malesani; M. Mašek; J. Mao; A. Melandri; B. M. Mihov; R. Natsvlishvili; F. Navarete; V. Nedora; J. Nicolas; M. Odeh; J. Palmerio; P. T.H. Pang; M. De Pasquale; H. W. Peng; S. Pormente; J. Peloton; T. Pradier; O. Pyshna; Y. Rajabov; N. A. Rakotondrainibe; J. P. Rivet; L. Rousselot; A. Saccardi; N. Sasaki; B. Schneider; M. Serrau; A. Shokry; L. Slavcheva-Mihova; A. Simon; O. Sokoliuk; G. Srinivasaragavan; R. Strausbaugh; A. Takey; N. R. Tanvir; C. C. Thöne; Y. Tillayev; I. Tosta e Melo; D. Turpin; A. de Ugarte Postigo; V. Vasylenko; S. D. Vergani; Z. Vidadi; D. Xu; L. T. Wang; X. F. Wang; J. M. Winters; X. L. Zhang; Z. Zhu

doi:10.1093/mnras/stae503

Multiband analyses of the bright GRB 230812B and the associated SN2023pel

T. Hussenot-Desenonges^*, T. Wouters, N. Guessoum^*, I. Abdi, A. Abulwfa, C. Adami, J. F. Agüí Fernández, T. Ahumada, V. Aivazyan, D. Akl, S. Anand, C. M. Andrade, S. Antier^*, S. A. Ata, P. D'Avanzo, Y. A. Azzam, A. Baransky, S. Basa, M. Blazek, P. BendjoyaS. Beradze, P. Boumis, M. Bremer, R. Brivio, V. Buat, M. Bulla, O. Burkhonov, E. Burns, S. B. Cenko, M. W. Coughlin, W. Corradi, F. Daigne, T. Dietrich, D. Dornic, J. G. Ducoin, P. A. Duverne, E. G. Elhosseiny, F. I. Elnagahy, M. A. El-Sadek, M. Ferro, E. Le Floc'H, M. Freeberg, J. P.U. Fynbo, D. Götz, E. Gurbanov, G. M. Hamed, E. Hasanov, B. F. Healy, K. E. Heintz, P. Hello, R. Inasaridze, A. Iskandar, N. Ismailov, L. Izzo, S. Jhawar, T. Jegou du Laz, T. M. Kamel, S. Karpov, A. Klotz, E. Koulouridis, N. P. Kuin, N. Kochiashvili, S. Leonini, K. X. Lu, D. B. Malesani, M. Mašek, J. Mao, A. Melandri, B. M. Mihov, R. Natsvlishvili, F. Navarete, V. Nedora, J. Nicolas, M. Odeh, J. Palmerio, P. T.H. Pang, M. De Pasquale, H. W. Peng, S. Pormente, J. Peloton, T. Pradier, O. Pyshna, Y. Rajabov, N. A. Rakotondrainibe, J. P. Rivet, L. Rousselot, A. Saccardi, N. Sasaki, B. Schneider, M. Serrau, A. Shokry, L. Slavcheva-Mihova, A. Simon, O. Sokoliuk, G. Srinivasaragavan, R. Strausbaugh, A. Takey, N. R. Tanvir, C. C. Thöne, Y. Tillayev, I. Tosta e Melo, D. Turpin, A. de Ugarte Postigo, V. Vasylenko, S. D. Vergani, Z. Vidadi, D. Xu, L. T. Wang, X. F. Wang, J. M. Winters, X. L. Zhang, Z. Zhu

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

GRB 230812B is a bright and relatively nearby (z = 0.36) long gamma-ray burst (GRB) that has generated significant interest in the community and has thus been observed over the entire electromagnetic spectrum. We report over 80 observations in X-ray, ultraviolet, optical, infrared, and submillimetre bands from the GRANDMA (Global Rapid Advanced Network for Multimessenger Addicts) network of observatories and from observational partners. Adding complementary data from the literature, we then derive essential physical parameters associated with the ejecta and external properties (i.e. the geometry and environment) of the GRB and compare with other analyses of this event. We spectroscopically confirm the presence of an associated supernova, SN2023pel, and we derive a photospheric expansion velocity of v ∼ 17 × 10³ km s^-1. We analyse the photometric data first using empirical fits of the flux and then with full Bayesian inference. We again strongly establish the presence of a supernova in the data, with a maximum (pseudo-)bolometric luminosity of 5.75 × 10⁴² erg s^-1, at 15.76⁺_-1^0.₂₁⁸¹ d (in the observer frame) after the trigger, with a half-max time width of 22.0 d. We compare these values with those of SN1998bw, SN2006aj, and SN2013dx. Our best-fitting model favours a very low density environment (log₁₀(n_ISM/cm^-3) = -2.38⁺_-1^1.₆₀⁴⁵) and small values for the jet's core angle θ_core = 1.54⁺_-0^1.₈₁⁰² deg and viewing angle θ_obs = 0.76⁺_-0^1.₇₆²⁹ deg. GRB 230812B is thus one of the best observed afterglows with a distinctive supernova bump.

Original language	English
Pages (from-to)	1-19
Number of pages	19
Journal	Monthly Notices of the Royal Astronomical Society
Volume	530
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stae503
Publication status	Published - 1 May 2024

Bibliographical note

Publisher Copyright:
© 2024 The Author(s).

Funding

This work has been coordinated with Mansi Kasliwal and Brad Cenko's group, with whom we shared common developments and visions for time-domain astronomy tools and methods (e.g. SKYPORTAL). We thank Gokul Prem Srinivasaragavan in particular for fruitful exchanges on this object. We also thank the anonymous reviewer for constructive comments that have helped improve the paper. The GRANDMA collaboration thanks its entire network of observatories/observers, all its partners in observations and analyses, and the amateur participants of its Kilonova-Catcher (KNC) programme. We dedicate this work to D. A. Kann, whose groundbreaking work in the field of GRBs earned him international recognition over the past two decades. Alex, your contributions to the world of GRB science will always be remembered. We deeply miss you and hope you are proud of the way the GRB community carries on your legacy. This research has also made use of the MISTRAL data base, based on observations made at Observatoire de Haute Provence (CNRS), France, with the MISTRAL spectro-imager, and operated at CeSAM (LAM), Marseille, France. The GRB OHP observing team is particularly grateful to J\u00E9rome Schmitt for the major role he has played in the development and operations of the MISTRAL instrument at the T193 telescope. GRANDMA thanks amateur astronomers for their observations: MS, KF, SL, JN, MF, MO. This work is based on observations carried out under project number S23BG with the IRAM NOEMA interferometer. Partly based on observations made with the Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrof\u00EDsica de Canarias, on the island of La Palma. Partly based on observations made with the Nordic Optical Telescope, owned in collaboration by the University of Turku and Aarhus University, and operated jointly by Aarhus University, the University of Turku, and the University of Oslo, representing Denmark, Finland, and Norway, the University of Iceland and Stockholm University at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias. This work is based on observations collected at the Centro Astron\u00F3mico Hispano en Andaluc\u00EDa (CAHA) at Calar Alto, operated jointly by Junta de Andaluc\u00EDa and Consejo Superior de Investigaciones Cient\u00EDficas (IAA-CSIC) (Programme code: 23B-2.2-24, PI Ag\u00FC\u00ED Fern\u00E1ndez, J. F.). This work used Expanse at the San Diego Supercomputer Cluster through allocation AST200029 - 'Towards a complete catalog of variable sources to support efficient searches for compact binary mergers and their products' from the Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS) programe. WC and NS wish to thank Laborat\u00F3rio Nacional de Astrof\u00EDsica - LNA and OPD staff, Universidade do Estado do Amazonas - UEA and the Brazilian Agencies CNPq and Capes. GRANDMA has received financial support from the CNRS through the MITI interdisciplinary programmes. TW and PTHP are supported by the research programme of the Netherlands Organization for Scientific Research (NWO). SA acknowledges the financial support of the Programme National Hautes Energies (PNHE). MWC acknowledges support from the National Science Foundation with grant numbers PHY-2347628 and OAC-2117997. CA and MWC were supported by the Preparing for Astrophysics with LSST Program, funded by the Heising-Simons Foundation through grant 2021-2975, and administered by Las Cumbres Observatory. The Egyptian team acknowledges support from the Science, Technology & Innovation Funding Authority (STDF) under grant number 45779. SK is supported by European Structural and Investment Fund and the Czech Ministry of Education, Youth and Sports (Project CoGraDS - CZ.02.1.01/0.0/0.0/15 003/0000437). NPMK is supported by the UKSA Swift operations grant. NG, DA, and IA acknowledge support from the American University of Sharjah (UAE) through the grant FRG22-C-S68. MM is supported by the LM2023032 and LM2023047 grants of the Ministry of Education of the Czech Republic. JM is supported by the National Key R & D Program of China (2023YFE0101200), the Yunnan Revitalization Talent Support Program (YunLing Scholar Award), and NSFC grant 12393813. DBM acknowledges support from the European Research Council (ERC) under the European Union's research and innovation programme (ERC Grant HEAVYMETAL No. 101071865). JGD is supported by a research grant from the Ile-de-France Region within the framework of the Domaine d'Int\u00E9r\u00EAt Majeur-Astrophysique et Conditions d'Apparition de la Vie (DIM-ACAV). The work of FN is supported by NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. The Kilonova-Catcher programme is supported by the IdEx Universit\u00E9 de Paris Cit\u00E9, ANR-18-IDEX-0001 and Paris-Saclay, IJCLAB. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). The Cosmic Dawn Center is supported by the Danish National Research Foundation. The Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS) programe is supported by National Science Foundation grants #2138259, #2138286, #2138307, #2137603, and #2138296.

Funders	Funder number
European Structural and Investment Fund
Stockholms Universitet
Universidade do Estado do Amazonas
NOIRLab
Junta de Andalucía
Turun Yliopisto
INSU
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Centro Astronómico Hispano en Andalucía
Aarhus Universitet
Instituto de Astrofísica de Canarias
Centre National de la Recherche Scientifique
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Observatoire de Haute Provence
Ile-de-France Region
Consejo Superior de Investigaciones Científicas
Programme National Hautes Energies
Laboratório Nacional de Astrofísica
Universitetet i Oslo
Háskóli Íslands
Yunnan Revitalization Talent Support Program
Majeur-Astrophysique et Conditions d'Apparition de la Vie
European Research Council
National Key Research and Development Program of China	2023YFE0101200
National Science Foundation	PHY-2347628, OAC-2117997
American University of Sharjah	FRG22-C-S68, LM2023047, LM2023032
Ministerstvo Školství, Mládeže a Tělovýchovy	CoGraDS - CZ.02.1.01/0.0/0.0/15 003/0000437
Danmarks Grundforskningsfond	2138286, 2138296, 2137603, 2138307, 2138259
Science and Technology Development Fund	45779
IdEx Université de Paris Cité	ANR-18-IDEX-0001
European Union's research and innovation programme	101071865
Heising-Simons Foundation	2021-2975
National Natural Science Foundation of China	12393813
Instituto de Astrofísica de Andalucía	23B-2.2-24, AST200029

Keywords

gamma-ray burst: individual: GRB 230812B
gamma-ray bursts
methods: statistical
techniques: photometric
techniques: spectroscopic
transients: supernovae

Access to Document

10.1093/mnras/stae503Licence: CC BY

stae503Final published version, 3.27 MBLicence: CC BY

Cite this

Hussenot-Desenonges, T., Wouters, T., Guessoum, N., Abdi, I., Abulwfa, A., Adami, C., Agüí Fernández, J. F., Ahumada, T., Aivazyan, V., Akl, D., Anand, S., Andrade, C. M., Antier, S., Ata, S. A., D'Avanzo, P., Azzam, Y. A., Baransky, A., Basa, S., Blazek, M., ... Zhu, Z. (2024). Multiband analyses of the bright GRB 230812B and the associated SN2023pel. Monthly Notices of the Royal Astronomical Society, 530(1), 1-19. https://doi.org/10.1093/mnras/stae503

@article{87d5aa312baf46dab542bb266de6035b,

title = "Multiband analyses of the bright GRB 230812B and the associated SN2023pel",

abstract = "GRB 230812B is a bright and relatively nearby (z = 0.36) long gamma-ray burst (GRB) that has generated significant interest in the community and has thus been observed over the entire electromagnetic spectrum. We report over 80 observations in X-ray, ultraviolet, optical, infrared, and submillimetre bands from the GRANDMA (Global Rapid Advanced Network for Multimessenger Addicts) network of observatories and from observational partners. Adding complementary data from the literature, we then derive essential physical parameters associated with the ejecta and external properties (i.e. the geometry and environment) of the GRB and compare with other analyses of this event. We spectroscopically confirm the presence of an associated supernova, SN2023pel, and we derive a photospheric expansion velocity of v ∼ 17 × 103 km s-1. We analyse the photometric data first using empirical fits of the flux and then with full Bayesian inference. We again strongly establish the presence of a supernova in the data, with a maximum (pseudo-)bolometric luminosity of 5.75 × 1042 erg s-1, at 15.76+-10.2181 d (in the observer frame) after the trigger, with a half-max time width of 22.0 d. We compare these values with those of SN1998bw, SN2006aj, and SN2013dx. Our best-fitting model favours a very low density environment (log10(nISM/cm-3) = -2.38+-11.6045) and small values for the jet's core angle θcore = 1.54+-01.8102 deg and viewing angle θobs = 0.76+-01.7629 deg. GRB 230812B is thus one of the best observed afterglows with a distinctive supernova bump.",

keywords = "gamma-ray burst: individual: GRB 230812B, gamma-ray bursts, methods: statistical, techniques: photometric, techniques: spectroscopic, transients: supernovae",

author = "T. Hussenot-Desenonges and T. Wouters and N. Guessoum and I. Abdi and A. Abulwfa and C. Adami and {Ag{\"u}{\'i} Fern{\'a}ndez}, {J. F.} and T. Ahumada and V. Aivazyan and D. Akl and S. Anand and Andrade, {C. M.} and S. Antier and Ata, {S. A.} and P. D'Avanzo and Azzam, {Y. A.} and A. Baransky and S. Basa and M. Blazek and P. Bendjoya and S. Beradze and P. Boumis and M. Bremer and R. Brivio and V. Buat and M. Bulla and O. Burkhonov and E. Burns and Cenko, {S. B.} and Coughlin, {M. W.} and W. Corradi and F. Daigne and T. Dietrich and D. Dornic and Ducoin, {J. G.} and Duverne, {P. A.} and Elhosseiny, {E. G.} and Elnagahy, {F. I.} and El-Sadek, {M. A.} and M. Ferro and {Le Floc'H}, E. and M. Freeberg and Fynbo, {J. P.U.} and D. G{\"o}tz and E. Gurbanov and Hamed, {G. M.} and E. Hasanov and Healy, {B. F.} and Heintz, {K. E.} and P. Hello and R. Inasaridze and A. Iskandar and N. Ismailov and L. Izzo and S. Jhawar and {Jegou du Laz}, T. and Kamel, {T. M.} and S. Karpov and A. Klotz and E. Koulouridis and Kuin, {N. P.} and N. Kochiashvili and S. Leonini and Lu, {K. X.} and Malesani, {D. B.} and M. Ma{\v s}ek and J. Mao and A. Melandri and Mihov, {B. M.} and R. Natsvlishvili and F. Navarete and V. Nedora and J. Nicolas and M. Odeh and J. Palmerio and Pang, {P. T.H.} and {De Pasquale}, M. and Peng, {H. W.} and S. Pormente and J. Peloton and T. Pradier and O. Pyshna and Y. Rajabov and Rakotondrainibe, {N. A.} and Rivet, {J. P.} and L. Rousselot and A. Saccardi and N. Sasaki and B. Schneider and M. Serrau and A. Shokry and L. Slavcheva-Mihova and A. Simon and O. Sokoliuk and G. Srinivasaragavan and R. Strausbaugh and A. Takey and Tanvir, {N. R.} and Th{\"o}ne, {C. C.} and Y. Tillayev and {Tosta e Melo}, I. and D. Turpin and {de Ugarte Postigo}, A. and V. Vasylenko and Vergani, {S. D.} and Z. Vidadi and D. Xu and Wang, {L. T.} and Wang, {X. F.} and Winters, {J. M.} and Zhang, {X. L.} and Z. Zhu",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s).",

year = "2024",

month = may,

day = "1",

doi = "10.1093/mnras/stae503",

language = "English",

volume = "530",

pages = "1--19",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

Hussenot-Desenonges, T, Wouters, T, Guessoum, N, Abdi, I, Abulwfa, A, Adami, C, Agüí Fernández, JF, Ahumada, T, Aivazyan, V, Akl, D, Anand, S, Andrade, CM, Antier, S, Ata, SA, D'Avanzo, P, Azzam, YA, Baransky, A, Basa, S, Blazek, M, Bendjoya, P, Beradze, S, Boumis, P, Bremer, M, Brivio, R, Buat, V, Bulla, M, Burkhonov, O, Burns, E, Cenko, SB, Coughlin, MW, Corradi, W, Daigne, F, Dietrich, T, Dornic, D, Ducoin, JG, Duverne, PA, Elhosseiny, EG, Elnagahy, FI, El-Sadek, MA, Ferro, M, Le Floc'H, E, Freeberg, M, Fynbo, JPU, Götz, D, Gurbanov, E, Hamed, GM, Hasanov, E, Healy, BF, Heintz, KE, Hello, P, Inasaridze, R, Iskandar, A, Ismailov, N, Izzo, L, Jhawar, S, Jegou du Laz, T, Kamel, TM, Karpov, S, Klotz, A, Koulouridis, E, Kuin, NP, Kochiashvili, N, Leonini, S, Lu, KX, Malesani, DB, Mašek, M, Mao, J, Melandri, A, Mihov, BM, Natsvlishvili, R, Navarete, F, Nedora, V, Nicolas, J, Odeh, M, Palmerio, J, Pang, PTH, De Pasquale, M, Peng, HW, Pormente, S, Peloton, J, Pradier, T, Pyshna, O, Rajabov, Y, Rakotondrainibe, NA, Rivet, JP, Rousselot, L, Saccardi, A, Sasaki, N, Schneider, B, Serrau, M, Shokry, A, Slavcheva-Mihova, L, Simon, A, Sokoliuk, O, Srinivasaragavan, G, Strausbaugh, R, Takey, A, Tanvir, NR, Thöne, CC, Tillayev, Y, Tosta e Melo, I, Turpin, D, de Ugarte Postigo, A, Vasylenko, V, Vergani, SD, Vidadi, Z, Xu, D, Wang, LT, Wang, XF, Winters, JM, Zhang, XL & Zhu, Z 2024, 'Multiband analyses of the bright GRB 230812B and the associated SN2023pel', Monthly Notices of the Royal Astronomical Society, vol. 530, no. 1, pp. 1-19. https://doi.org/10.1093/mnras/stae503

TY - JOUR

T1 - Multiband analyses of the bright GRB 230812B and the associated SN2023pel

AU - Hussenot-Desenonges, T.

AU - Wouters, T.

AU - Guessoum, N.

AU - Abdi, I.

AU - Abulwfa, A.

AU - Adami, C.

AU - Agüí Fernández, J. F.

AU - Ahumada, T.

AU - Aivazyan, V.

AU - Akl, D.

AU - Anand, S.

AU - Andrade, C. M.

AU - Antier, S.

AU - Ata, S. A.

AU - D'Avanzo, P.

AU - Azzam, Y. A.

AU - Baransky, A.

AU - Basa, S.

AU - Blazek, M.

AU - Bendjoya, P.

AU - Beradze, S.

AU - Boumis, P.

AU - Bremer, M.

AU - Brivio, R.

AU - Buat, V.

AU - Bulla, M.

AU - Burkhonov, O.

AU - Burns, E.

AU - Cenko, S. B.

AU - Coughlin, M. W.

AU - Corradi, W.

AU - Daigne, F.

AU - Dietrich, T.

AU - Dornic, D.

AU - Ducoin, J. G.

AU - Duverne, P. A.

AU - Elhosseiny, E. G.

AU - Elnagahy, F. I.

AU - El-Sadek, M. A.

AU - Ferro, M.

AU - Le Floc'H, E.

AU - Freeberg, M.

AU - Fynbo, J. P.U.

AU - Götz, D.

AU - Gurbanov, E.

AU - Hamed, G. M.

AU - Hasanov, E.

AU - Healy, B. F.

AU - Heintz, K. E.

AU - Hello, P.

AU - Inasaridze, R.

AU - Iskandar, A.

AU - Ismailov, N.

AU - Izzo, L.

AU - Jhawar, S.

AU - Jegou du Laz, T.

AU - Kamel, T. M.

AU - Karpov, S.

AU - Klotz, A.

AU - Koulouridis, E.

AU - Kuin, N. P.

AU - Kochiashvili, N.

AU - Leonini, S.

AU - Lu, K. X.

AU - Malesani, D. B.

AU - Mašek, M.

AU - Mao, J.

AU - Melandri, A.

AU - Mihov, B. M.

AU - Natsvlishvili, R.

AU - Navarete, F.

AU - Nedora, V.

AU - Nicolas, J.

AU - Odeh, M.

AU - Palmerio, J.

AU - Pang, P. T.H.

AU - De Pasquale, M.

AU - Peng, H. W.

AU - Pormente, S.

AU - Peloton, J.

AU - Pradier, T.

AU - Pyshna, O.

AU - Rajabov, Y.

AU - Rakotondrainibe, N. A.

AU - Rivet, J. P.

AU - Rousselot, L.

AU - Saccardi, A.

AU - Sasaki, N.

AU - Schneider, B.

AU - Serrau, M.

AU - Shokry, A.

AU - Slavcheva-Mihova, L.

AU - Simon, A.

AU - Sokoliuk, O.

AU - Srinivasaragavan, G.

AU - Strausbaugh, R.

AU - Takey, A.

AU - Tanvir, N. R.

AU - Thöne, C. C.

AU - Tillayev, Y.

AU - Tosta e Melo, I.

AU - Turpin, D.

AU - de Ugarte Postigo, A.

AU - Vasylenko, V.

AU - Vergani, S. D.

AU - Vidadi, Z.

AU - Xu, D.

AU - Wang, L. T.

AU - Wang, X. F.

AU - Winters, J. M.

AU - Zhang, X. L.

AU - Zhu, Z.

PY - 2024/5/1

Y1 - 2024/5/1

N2 - GRB 230812B is a bright and relatively nearby (z = 0.36) long gamma-ray burst (GRB) that has generated significant interest in the community and has thus been observed over the entire electromagnetic spectrum. We report over 80 observations in X-ray, ultraviolet, optical, infrared, and submillimetre bands from the GRANDMA (Global Rapid Advanced Network for Multimessenger Addicts) network of observatories and from observational partners. Adding complementary data from the literature, we then derive essential physical parameters associated with the ejecta and external properties (i.e. the geometry and environment) of the GRB and compare with other analyses of this event. We spectroscopically confirm the presence of an associated supernova, SN2023pel, and we derive a photospheric expansion velocity of v ∼ 17 × 103 km s-1. We analyse the photometric data first using empirical fits of the flux and then with full Bayesian inference. We again strongly establish the presence of a supernova in the data, with a maximum (pseudo-)bolometric luminosity of 5.75 × 1042 erg s-1, at 15.76+-10.2181 d (in the observer frame) after the trigger, with a half-max time width of 22.0 d. We compare these values with those of SN1998bw, SN2006aj, and SN2013dx. Our best-fitting model favours a very low density environment (log10(nISM/cm-3) = -2.38+-11.6045) and small values for the jet's core angle θcore = 1.54+-01.8102 deg and viewing angle θobs = 0.76+-01.7629 deg. GRB 230812B is thus one of the best observed afterglows with a distinctive supernova bump.

AB - GRB 230812B is a bright and relatively nearby (z = 0.36) long gamma-ray burst (GRB) that has generated significant interest in the community and has thus been observed over the entire electromagnetic spectrum. We report over 80 observations in X-ray, ultraviolet, optical, infrared, and submillimetre bands from the GRANDMA (Global Rapid Advanced Network for Multimessenger Addicts) network of observatories and from observational partners. Adding complementary data from the literature, we then derive essential physical parameters associated with the ejecta and external properties (i.e. the geometry and environment) of the GRB and compare with other analyses of this event. We spectroscopically confirm the presence of an associated supernova, SN2023pel, and we derive a photospheric expansion velocity of v ∼ 17 × 103 km s-1. We analyse the photometric data first using empirical fits of the flux and then with full Bayesian inference. We again strongly establish the presence of a supernova in the data, with a maximum (pseudo-)bolometric luminosity of 5.75 × 1042 erg s-1, at 15.76+-10.2181 d (in the observer frame) after the trigger, with a half-max time width of 22.0 d. We compare these values with those of SN1998bw, SN2006aj, and SN2013dx. Our best-fitting model favours a very low density environment (log10(nISM/cm-3) = -2.38+-11.6045) and small values for the jet's core angle θcore = 1.54+-01.8102 deg and viewing angle θobs = 0.76+-01.7629 deg. GRB 230812B is thus one of the best observed afterglows with a distinctive supernova bump.

KW - gamma-ray burst: individual: GRB 230812B

KW - gamma-ray bursts

KW - methods: statistical

KW - techniques: photometric

KW - techniques: spectroscopic

KW - transients: supernovae

UR - http://www.scopus.com/inward/record.url?scp=85189862611&partnerID=8YFLogxK

U2 - 10.1093/mnras/stae503

DO - 10.1093/mnras/stae503

M3 - Article

AN - SCOPUS:85189862611

SN - 0035-8711

VL - 530

SP - 1

EP - 19

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Multiband analyses of the bright GRB 230812B and the associated SN2023pel

Abstract

Bibliographical note

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this