[vsnet-grb-info 11788] GRB 120324A: CrAO optical upper limit
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Mar 31 20:30:52 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 13179
SUBJECT: GRB 120324A: CrAO optical upper limit
DATE: 12/03/31 11:30:44 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
V. Rumyantsev, K. Antonyuk (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of GRB 120324A (Zhang et al., GCN 13090) with AZT-11
telescope of CrAO observatory starting on March 25 (UT) 01:46:17 under
moderate weather conditions and seeing of about 2.7 arsces. Within
enhanced Swift-XRT position (Evans et al., GCN 13093) we do not detected
any optical source up to R=20.7. The source reported in (Guidorzi et al.,
GCN 13092; Im et al., GCN 13097; Sudilovsky et al., GCN 13098) is clearly
detected and have a brightness R=20.16 +/-0.25. A photometry is based on
the USNO-B1.0 star 1141-0365943 (19 24 20.29 +24 07 58.2) assuming
R=17.07:
T0+ Filter, Exposure, OT, uplim (3 sigma)
(mid, d) (s)
0.8411 R 16x180 n/d 20.7
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