TY  - JOUR
PB  - Oxford University Press (OUP)
SP  - 1
ID  - discovery10190966
JF  - Monthly Notices of the Royal Astronomical Society
A1  - Hussenot-Desenonges, T
A1  - Wouters, T
A1  - Guessoum, N
A1  - Abdi, I
A1  - Abulwfa, A
A1  - Adami, C
A1  - Agüí Fernández, JF
A1  - Ahumada, T
A1  - Aivazyan, V
A1  - Akl, D
A1  - Anand, S
A1  - Andrade, CM
A1  - Antier, S
A1  - Ata, SA
A1  - D'Avanzo, P
A1  - Azzam, YA
A1  - Baransky, A
A1  - Basa, S
A1  - Blazek, M
A1  - Bendjoya, P
A1  - Beradze, S
A1  - Boumis, P
A1  - Bremer, M
A1  - Brivio, R
A1  - Buat, V
A1  - Bulla, M
A1  - Burkhonov, O
A1  - Burns, E
A1  - Cenko, SB
A1  - Coughlin, MW
A1  - Corradi, W
A1  - Daigne, F
A1  - Dietrich, T
A1  - Dornic, D
A1  - Ducoin, JG
A1  - Duverne, PA
A1  - Elhosseiny, EG
A1  - Elnagahy, FI
A1  - El-Sadek, MA
A1  - Ferro, M
A1  - Le Floc'H, E
A1  - Freeberg, M
A1  - Fynbo, JPU
A1  - Götz, D
A1  - Gurbanov, E
A1  - Hamed, GM
A1  - Hasanov, E
A1  - Healy, BF
A1  - Heintz, KE
A1  - Hello, P
A1  - Inasaridze, R
A1  - Iskandar, A
A1  - Ismailov, N
A1  - Izzo, L
A1  - Jhawar, S
A1  - Jegou du Laz, T
A1  - Kamel, TM
A1  - Karpov, S
A1  - Klotz, A
A1  - Koulouridis, E
A1  - Kuin, NP
A1  - Kochiashvili, N
A1  - Leonini, S
A1  - Lu, KX
A1  - Malesani, DB
A1  - Ma?ek, M
A1  - Mao, J
A1  - Melandri, A
A1  - Mihov, BM
A1  - Natsvlishvili, R
A1  - Navarete, F
A1  - Nedora, V
A1  - Nicolas, J
A1  - Odeh, M
A1  - Palmerio, J
A1  - Pang, PTH
A1  - De Pasquale, M
A1  - Peng, HW
A1  - Pormente, S
A1  - Peloton, J
A1  - Pradier, T
A1  - Pyshna, O
A1  - Rajabov, Y
A1  - Rakotondrainibe, NA
A1  - Rivet, JP
A1  - Rousselot, L
A1  - Saccardi, A
A1  - Sasaki, N
A1  - Schneider, B
A1  - Serrau, M
A1  - Shokry, A
A1  - Slavcheva-Mihova, L
A1  - Simon, A
A1  - Sokoliuk, O
A1  - Srinivasaragavan, G
A1  - Strausbaugh, R
A1  - Takey, A
A1  - Tanvir, NR
A1  - Thöne, CC
A1  - Tillayev, Y
UR  - http://dx.doi.org/10.1093/mnras/stae503
KW  - methods: statistical
KW  -  techniques: photometric
KW  -  techniques: spectroscopic
KW  -  gamma-ray burst: individual: GRB 230812B
KW  -  gamma-ray bursts
KW  -  transients: supernovae
AV  - public
Y1  - 2024/05/01/
N1  - © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
IS  - 1
TI  - Multiband analyses of the bright GRB 230812B and the associated SN2023pel
SN  - 0035-8711
VL  - 530
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 ?core = 1.54+-01.8102 deg and viewing angle ?obs = 0.76+-01.7629 deg. GRB 230812B is thus one of the best observed afterglows with a distinctive supernova bump.
EP  - 19
ER  -