GCN Circular 15190
Subject
GRB 130831A: Maidanak optical observations
Date
2013-09-08T00:17:41Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), A. Volnova (IKI), B. Hafizov (UBAI), O. Burhonov
(UBAI) report on behalf of larger GRB follow-up collaboration:
We observed the afterglow (Hagen et al., GCN 15139; Guidorzi et al.,
GCN 15140) of the Swift GRB 130831A (Hagen et al., GCN 15139) with
AZT-22 telescope equipped with SNUCAM of Maidanak observatory in R
filter. A preliminary photometry of combined images is based on SDSS
stars (see at the bottom):
T_start T0+ Filter, Exposure, OT
(UT) (mid, d) (s)
2013-09-02T13:58:23 2.0410 R 1x600 22.20 +/- 0.10
2013-09-04T18:47:13 4.2555 R 5x600 22.53 +/- 0.07
2013-09-05T18:57:03 5.2658 R 6x600 22.90 +/- 0.07
A preliminary lc of the afterglow GRB 130831A based on our GCNs ##15185,
15186, 15188, 15189 and reported in this circular can be found in
http://grb.rssi.ru/GRB130831A/grb130831A_lc_preliminary.PNG
A power-law decay of the lc between 0.1 days and 2 days after trigger is
-1.68 +/- 0.06 and marginally consistent with power-law decay reported
by Watson (GCN 15179).
Reference stars
N SDSS id R(Lupton)errR
1 J235443.71+292539.3 13.491 0.016
2 J235438.60+292547.3 14.136 0.015
3 J235423.64+292452.8 17.120 0.016
