[vsnet-grb-info 3814] GRB060923C: optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5648
SUBJECT: GRB060923C: optical limit
DATE:    06/09/28 16:38:13 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

G. Kornienko, A. Erofeeva (UAPhO), A.Pozanenko (IKI), V.Rumyantsev (CrAO) on
behalf of larger GRB follow up collaboration report:

We  observed the error box of  GRB060923C (Stamatikos et al., GCN  5591)
with 0.4m telescope of  Ussuriysk Astrophysical Observatory  in R-band
starting  Sep.23 (UT) 13:51:55.  We do not detect the optical transient
detected by Fox (GCN 5607). Upper limits of the first image (exposure 60 s)
and combined image (exp. 10x60 s) are based on USNOA2.0:

Mid time,    Exposure,   Limiting mag (3 sigma)
(UT)           (s)

Sep. 23.5781     1x60        16.0
Sep. 23.5829    10x60       17.3

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