[vsnet-grb-info 12801] GRB 130122A: optical observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Jan 24 19:09:49 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 14148
SUBJECT: GRB 130122A: optical observations
DATE: 13/01/24 10:05:37 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
A. Volnova (SAI MSU/IKI), V. Linkov (ISON-Kislovodsk), I. Molotov (KIAM),
V. Kouprianov (GAO), A. Pozanenko (IKI), report on behalf of larger
collaboration:
We observed the field of GRB 130122A (Lien et al., GCN 14140) with
SANTEL-400AN (0.4-m f/3) telescope of ISON-Kislovodsk observatory.
Observations started on Jan. 22 (UT) 23:44 and we obtained several
unfiltered images of 60 s and 100 s exposures. Initial part of our
observations were carried under unfavorable weather conditions. Starting on
Jan.23 (UT) 00:14:14 we clearly detect optical afterglow of GRB 130122A
(Lien et al., GCN 14140; Sonbas et al., GCN 14141; Gorbovskoy et al., GCN
14142) in single images of 60 s exposure. A preliminary photometry of
stacked images is based on USNO-B1.0 (R2) nearby stars:
T_start, T0+, Exp, Filter, OT
(UT) mid (d) (s)
00:14:14 0.00899 8x60 none 18.0 +/-0.1
00:47:45 0.04474 100 none 18.5 +/- 0.5
01:02:07 0.05579 4x60 none >17.3
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