GCN Circular 13019
Subject
GRB 120308A: confirmation of the optical afterglow
Date
2012-03-08T08:06:37Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf
of larger GRB follow-up collaboration:
The 0.45-m telescope of ISON-NM observatory robotically followed up the
field of the Swift GRB 120308A (Baumgartner et al., GCN 13017 ) on March
8, 06:16:55, i.e. 3.3 minutes after burst trigger. In the first frame of 30
s exposure we do not detect the optical afterglow (Virgili et al., GCN
13018 ) up to R~16m. However in a stacked several first images of 1800 s
exposure we clearly detect new source in coordinates 14 36 19.95 +79 41 12.3
which are coincide with coordinates of the optical afterglow (Virgili et
al., GCN 13018 ). The magnitude of the source at (UT) 06:38:10 (middle
time) is R~17.30m. All images are unfiltered and calibrated against
USNO-B1.0 R2 field stars.
All results are preliminary. Observation is continuing.