GRB 201015A: from seconds to months of optical monitoring and supernova discovery
2023; Oxford University Press; Volume: 527; Issue: 4 Linguagem: Inglês
10.1093/mnras/stad3989
ISSN1365-2966
AutoresS. Belkin, A. Pozanenko, P. Yu. Minaev, N. Pankov, A. Volnova, A. Rossi, G. Stratta, S. Benetti, E. Palazzi, А. С. Москвитин, O. Burhonov, V V Rumyantsev, E. Klunko, R. Inasaridze, I. Reva, Vitaliy Kim, M. Jelínek, Д. А. Канн, A. E. Volvach, L. N. Volvach, D. Xu, Z. Zhu, Shao-Yu Fu, Aram Mkrtchyan,
Tópico(s)Astrophysical Phenomena and Observations
ResumoWe present full photometric coverage and spectroscopic data for soft GRB 201015A with a redshift z = 0.426. Our data spans a time range of 85 days following the detection of GRB. These observations revealed an underlying supernova SN 201015A with a maximum at $8.54 \pm $1.48 days (rest frame) and an optical peak absolute magnitude $-19.45_{-0.47}^{+0.85}$ mag. The supernova stands out clearly, since the contribution of the afterglow at this time is not dominant, which made it possible to determine SN's parameters. A comparison of these parameters reveals that the SN 201015A is the earliest (the minimum $T_{max}$) known supernova associated with gamma-ray bursts. Spectroscopic observations during the supernova decay stage showed broad lines, indicating a large photospheric velocity, and identified this supernova as a type Ic-BL. Thus, the SN 201015A associated with the GRB 201015A becomes the 27th SN/GRB confirmed by both photometric and spectroscopic observations. Using the results of spectral analysis based on the available data of Fermi-GBM experiment, the parameters $E_\text{p,i} = 20.0 \pm 8.5$ keV and $E_\text{iso} = (1.1 \pm 0.2) \times 10^{50}$ erg were obtained. According to the position of the burst on the $E_\text{p,i}$-$E_\text{iso}$ correlation, GRB 201015A was classified as a Type II (long) gamma-ray burst, which was also confirmed by the $T_\text{90,i}$-$EH$ diagram.
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