GCN Circular 17565
Subject
GRB 150309A: CrAO optic upper limit
Event
Date
2015-03-11T12:55:33Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev (CrAO), K. Antoniuk, E. Mazaeva (IKI), A. Pozanenko (IKI)
report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 150309A (Cummings et al., GCN
17553) with AZT-11 telescope of CrAO observatory starting on Mar. 09
(UT) 23:39:47. We took several images in R-filter of 180 s exposure. In
the enhanced XRT position (Osborne et al., GCN 17555) we do not detect
any object. An upper limit is following
Date UT start, t-t0 Filter Exp. UL (3 sigma)
(mid, days) (s)
2015-03-09 23:39:47 0.0468 R 20*180 20.9
The photometry is based on nearby USNO-B1.0 stars.