GCN Circular 13978
Subject
GRB 121117A: optical upper limit
Date
2012-11-21T07:21:38Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (SAI MSU, IKI), D.Varda (ISON), E.Sinyakov (ISON), I. Molotov
(KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of GRB 121117A (Cummings et al., GCN 13967) with
ORI-25 telescope of ISON-Blagoveshensk observatory starting on Nov.17
(UT) 09:05:39. We took several unfiltered exposures within 2 hours after
the start. We do not detect the OT (Oates et al., GCN 13973) in the XRT
error circle (Beardmore et al. GCN 13972) in any stacked images. A
photometry is based on nearby USNO-B1.0 stars (R2):
T_start T0+, Filter, exposure, UL (3 sigma)
(UT) mid (d) (s)
09:05:39 0.03105 none 80 x 40 18.3
10:05:44 0.07483 none 88 x 40 18.4
09:05:39 0.05397 none 168 x 40 18.9