GCN Circular 18049
Subject
GRB 150722A: LCOGT-Sutherland observations
Event
Date
2015-07-23T09:00:59Z (10 years ago)
From
Simone Dichiara at Ferrara U/Italy <dichiara@fe.infn.it>
S. Dichiara, C. Guidorzi (U. Ferrara), D. Kopac (LJMU),
on behalf of a large collaboration report:
One of the LCOGT 1-m telescopes in Sutherland (South Africa)
began observing GRB 150722A (Marshall et al. GCN 18042)
on July 22 at 17:01:14 UT, i.e. ~7 hours after the BAT
trigger with the r' and i' filters.
Within the XRT error circle (Evans et al. GCN 18044)
we found no new source down to the following limit:
Mid time from Total Exp Filter Magnitude
trigger (hr) (s)
-------------------------------------------------
7.46 120x15 r' > 20.0
7.90 120x6 i' > 18.8
-------------------------------------------------
Values have been calibrated against nearby USNOB-1 stars
(R2 and I).