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GCN Circular 3492

GRB050525a: optical upper limits
2005-05-27T14:01:46Z (19 years ago)
Vasilij Rumjantsev at CrAO <>
V.Rumyantsev (CrAO), G. Kornienko, A. Erofeeva, (UAPhO), A.Pozanenko (IKI)
on behalf of larger GRB follow up collaboration report:

We have observed the refined error box    (Cummings et al., GCN 3449) of the
Swift GRB050525a (Band et al., GCN 3466)  with 0.4m telescope of  Ussuriysk
Astrophysical Observatory (UAPhO), and AT-64 telescope of CrAO on May, 25.
We do not detect OT found by Rykoff et al., (GCN 3465). Upper limits of
unfiltered stacked images calibrated against of R USNO-A2.0 are following:

Mean time   Exposure   Limiting mag.
May 25
(UT)          (s)

13:59        7x60      15.9
19:38        40x60      19.5

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