GCN Circular 15241
Subject
GRB 130903A: optical observations
Event
Date
2013-09-21T19:07:58Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), V. Nevskiy (ISON), I. Molotov (KIAM), Yu. Krugly(IA
KhNU), I. Slyusarev (IA KhNU), A. Pozanenko (IKI) report on behalf of
larger collaboration:
After the refined analysis of the ISON-Kislovodsk observations (Volnova
et al., GCN 15171) of GRB 130903A field (Mereghetti et al., GCN 15169)
in the coordinates of OT reported by Tanga et al. (GCN 15177) we found a
faint source with a R magnitude 20.40 � 0.3. Photometry is based on the
stars reported below.
We also observed the field of the field with AZT-8 (0.7m) telescope of
Institute of Astronomy, Kharkiv National University starting on Sep. 03
(UT) 01:38:52. We took 11 frames with exposures of 120 seconds in R
filter. On the stacked image within 1.5 arcmin of error circle
localization (Mereghetti et al., GCN 15169) we do not detect any
source.
Photometry of combined image is the following
T_start, T0+, Exp., Filter, UL (3 sigma)
(UT) mid (d) (s)
01:38:52 0.03579 11*120 R >20.0
and based on SDSS stars, R (gri -> R transformations by Lupton 2005):
# SDSS R Err_R
1 J052835.34-000624.7 15.543 0.013
2 J052817.12-000749.0 14.650 0.012
3 J052841.64-000642.3 14.233 0.013