GCN Circular 9919
Subject
GRB 090912: optical observation
Date
2009-09-16T22:13:56Z (15 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev, V.Biryukov (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of the Swift GRB 090912 (Ukwatta et al., GCN 9905)
with Zeiss-600 telescope of SAI MSU Crimean branch in R-filter on Sep.12
between (UT) 17:41:36 - 19:08:10. Within XRT error circle (Beardmore et
al., GCN 9906) we do not detect any source. However in a stacked image we
detect faint source at the coordinates RA(J2000)= 12 32 09.82 Dec(J2000)=
+61 29 04.54 with uncertainty of 0.5 arcsec. It is 3.5" apart from XRT
center of the circle of 1.8" radius. We suggest the detected source as
afterglow candidate and urge deep observation to confirm variable nature of
the source.
The photometry of the source against nearby USNO-B1.0 star 1515-0196640
RA(J2000)= 12:32:18.77 Dec(J2000)= +61:30:00.3 assuming R=19.06 is
following:
T0+ Filter, Exposure, mag., err.
(d) (s)
0.1086 R 4620 21.8 +/- 0.3