[vsnet-grb-info 9686] GRB 100823A: optical upper limit
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Aug 28 05:45:26 JST 2010
TITLE: GCN CIRCULAR
NUMBER: 11154
SUBJECT: GRB 100823A: optical upper limit
DATE: 10/08/27 20:45:22 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
K. Antoniuk, V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of the Swift GRB 100823A (Mangano et al. GCN 11135)
with AZT-11 telescope of CrAO observatory. Several images in R-filter were
obtained on Aug. 23 between (UT) 22:05 - 22:53.
In enhanced XRT position (Goad et al. GCN 11136) we do not detect any source
up to R=20.7. The photometry of stacked image is based on USNO-B1.0 star
0958-0013520 located at RA(J2000) = 01:22:45.50, DEC(J2000) = +05:49:03.0
(assuming R=16.75):
t-T0, Filter, Exposure, OT, Upper limit (3 sigma)
(mid, d) (s)
0.2111 R 15*180 n/d 20.7
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