GCN Circular 13273
Subject
GRB 120422A: optical observations
Date
2012-04-29T17:45:14Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev, K. Antonyuk (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of GRB 120422A (Troja et al., GCN 13243) with AZT-11
telescope of CrAO observatory on April 22 (UT) 18:54:58 - 19:55:14 under
mean seeing of 2.8 arcsec and with Shajn telescope of CrAO observatory on
April 23 (UT) 18:22:50 - 19:29:02 under mean seeing of 1.8 arcsec. In
both epochs we cannot resolve the afterglow (Cucchiara et al., GCN 13245;
Kuin et al., GCN 13248) from possible host galaxy SDSS J090738.51+140108.3
and we used aperture photometry of host + afterglow. A preliminary
photometry is based on the USNO-B1.0 star 1040-0165213 (09 07 37.94 +14 00
43.0) assuming R=16.37:
T0+ Filter, Exposure, OT+host, uplim (3 sigma)
(mid, d) (s)
0.5091 R 20x180 20.5 +/-0.3 20.8
1.4891 R 60x60 20.74 +/-0.03 23.9
From the above photometry of the host + afterglow it is evident that in both
epochs there is apparent admixture of the afterglow in the brightness of the
galaxy SDSS J090738.51+140108.3 which have a brightness of R ~ 21.0.
We are grateful for CCD PL4240 provided by ISON for Shajn telescope.