GCN Circular 23601
Subject
GRB 181201A: photometric signature of the SN
Date
2019-01-03T20:40:28Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), E. Mazaeva (IKI), A. Pozanenko (IKI), P. Minaev
(IKI), A. Volnova (IKI), N. Tominaga (Konan University), S. Blinnikov
(ITEP), D. Chestnov (KIAM), E. Klunko (ISTP), I. Reva (FAPI), V.
Rumyantsev (CrAO), D. Buckley (SAAO), R. Ya. Inasaridze (AbAO) report
on behalf of GRB-FuN collaboration:
We observed the optical afterglow (e.g. Podesta et al., GCN 23470;
Kong GCN 23475) of the INTEGRAL GRB 181201A (Mereghetti et al., GCN
23469) with Gemini-N telescope on Dec. 22 in g'r'i'z and Dec. 24 in
r'i'-filters. Preliminary photometry of the OT is following.
Date t-T0 Filter Exp. OT Err.
(mid, days) (s)
2018-12-22 21.10536 i' 3*180 21.50 0.03
2018-12-22 21.09536 r' 3*180 21.82 0.03
2018-12-24 23.09418 i' 3*180 21.32 0.06
2018-12-24 23.10793 r' 3*240 21.83 0.03
The photometry is based on the SDSS-DR12 star
SDSS-DR12_id i' r'
J211710.81-123706.3 16.257 16.517
Based on our previous observations and photometry reported in GCNs
23475, 23478, 23486, 23504 we plot a light curve of the afterglow in
r'-filter (http://grb.rssi.ru/GRB181201A/GRB181201A_optics_fit.png).
Power law approximation of the LC before 2018-12-22 has an index of
1.19 +/-0.01. The photometry obtained on 2018-12-22 and 2018-12-24 has a
significance of about 2 and 6.5 sigma above the power law approximation.
Additionally the i'-magnitude increases between the two epochs. We can
suggest that we observed the Supernova signature associated with GRB
181201A.
