GCN Circular 17649
Subject
GRB 150323B: Khureltogot optical observations
Date
2015-03-27T19:01:34Z (9 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of
Astronomy and Geophysics MAS), A. Volnova (IKI), I.Molotov (KIAM), A.
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 150323B (Cummings et al., GCN 17619) with
ORI-40 telescope of Khureltogot observatory starting on Mar., 23 (UT)
16:06:11. We obtained 60 unfiltered images of 60 s exposure. Following
detection of XRT sources (D'Avanzo et al., GCN 17634) we do not detect
any source within XRT error circle of the source #1 up to a limiting
magnitude 21.2. In particular we do detect the optical source found by
Kelemen et al. (GCN 17643). At the position of XRT source #2 we found
optical source which coincides with USNO star mentioned by Xin et al.
(GCN 17638) and the star of SDSS DR9 catalog J172150.45+381700.1.
Photometry of the sources is following
Source# Date UT start t-T0 Filter Exp. mag. UL(3sigma)
(mid, days) (s)
1 2015-03-23 16:06:11 0.29859 none 60*60 n/d 21.2
2 2015-03-23 16:06:11 0.29859 none 60*60 20.7+/-0.25 21.2
The photometry is based on R magnitudes of nearby SDSS DR9 stars
SDSS9_id R(Lupton)
J172146.77+381659.6 15.65
J172126.47+382201.1 18.14
J172127.98+382239.0 15.39