GCN Circular 15239
Subject
GRB 130912A: AAO optical upper limit
Event
Date
2013-09-21T16:53:43Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI), R. Inasaridze (AAO), O. Kvaratskhelia (AAO), V.
Ayvazian(AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of Swift GRB 130912A (D'Elia et al., GCN 15212)
with AS-32 (0.7m) telescope of Abastumani Observatory starting Sep., 13
(UT) 00:18:46. We obtained several unfiltered frames with exposures of
120 s. On stacked images within the enhanced XRT circle (Beardmore et
al., GCN 15217) we did not detect an optical counterpart reported by
Tanga et al. (GCN 15214).
The details of the photometry are the following:
t_start, UT filter exptime,s t-t0, mid, days OT uplim
21:39:21 None 31*120 0.68394 n/d 22.3
The photometry is based 3 USNO-B1.0 stars:
USNO-B1.0 id RA Dec R2
1040-0030312 03:10:30.46 +14:01:11.1 19.44
1040-0030310 03:10:29.14 +14:01:21.6 17.38
1040-0030302 03:10:25.12 +14:00:31.6 15.90