GCN Circular 16247
Subject
GRB 140423A: Mondy optical observations
Event
Date
2014-05-12T17:32:49Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), I. Korobtsev
(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the optical afterglow (Elenin et al., GCN 16143; Kaur et
al., GCN 16144; Ferrante et al., GCN 16145; Chester et al., GCN 16147;
Maehara et al., GCN 16151) of the Swift GRB 140423A (Sonbas et al.,
GCN 16142) with AZT-33IK telescope of Sayan observatory (Mondy). We took
several images in R-filter of 60 s exposure on Apr., 25 and
of 120 s exposure on Apr., 26 and 27.
The details of the photometry are the following:
date UT start t-T0 Filter Exp. OT
(mid, days) (s)
2014-04-25 16:36:21 2.36772 R 90*60 22.63+/-0.10
2014-04-26 15:56:26 3.34068 R 46*120 23.46+/-0.18
2014-04-27 14:15:32 4.27964 R 54*120 > 22.9
The photometry is based on two SDSS stars, R (gri -> R transformations
by Lupton 2005):
SDSS id R
J130911.04+494854.6 20.209+/-0.053
J130924.79+494946.6 19.533+/-0.038