0548019 - ASÚ 2022 RIV FR eng J - Journal Article
Hu, Y.D. - Castro-Tirado, A.J. - Kumar, A. - Gupta, R. C. - Valeev, A.F. - Kann, D.A. - Castellon, A. - Agudo, I. - Aryan, A. - Caballero-García, María Dolores - Guziy, S. - Martin-Carrillo, A. - Oates, S.R. - Pian, E. - Sánchez-Ramírez, R. - Sokolov, V.V. - Zhang, B.B.
10.4 m GTC observations of the nearby VHE-detected GRB 190829A/SN 2019oyw.
Astronomy & Astrophysics. Roč. 646, February (2021), č. článku A50. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : gamma-ray burst * gamma-ray burst * RB 190829A
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.240, year: 2021
Method of publishing: Open access with time embargo
https://doi.org/10.1051/0004-6361/202039349

Gamma-ray burst (GRB) 190829A (z=0.0785) was detected by Fermi and Swift and also at very high energy (VHE) by the High-Energy Stereoscopic System (H.E.S.S.) telescopes. The prompt emission displayed two emission episodes separated by a quiescent gap of similar to 40 s. We present the 10.4 m Gran Telescopio Canarias (GTC) observations of the afterglow of GRB 190829A and its underlying supernova. We also compare GRB 190829A to GRB 180728A, a GRB with similar behaviour, and discuss the implications on underlying physical mechanisms producing these two GRBs. A detailed analysis of the multi-band observations of the afterglow requires the cooling frequency to pass between the optical and X-ray bands at early epochs. The afterglow then transitions to the underlying supernova (SN) 2019oyw, which dominates later on.Conclusions. Although the prompt emission temporal properties of GRB 190829A and GRB 180728A are similar, the two pulses are different in the spectral domain. We find that SN 2019oyw associated with GRB 190829A is powered by Ni decay and is a Type Ic-BL SN. The spectroscopic and photometric properties of this SN are consistent with those observed for SN 1998bw, but evolved earlier.
Permanent Link: http://hdl.handle.net/11104/0324148