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GCN Circular 6485

Subject
GRB070520B: optical observations
Date
2007-06-02T16:32:32Z (17 years ago)
From
Vasilij Rumjantsev at CrAO <rum@crao.crimea.ua>
D. Shakhovskoy, V. Rumyantsev (CrAO),  V. Biryukov (CrAO, SAI MSU),
A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:

We observed error box of GRB070520B (Moretti et al., GCN 6425) with AZT-11
(1.25m)  telescope of CrAO  in R-band under not optimal weather conditions
(seeing ~3.6 arcsec) on May 20 between (UT)18:47 and 19:21, i.e. starting 1
hour after burst onset. The weather condition No object is found in a
refined XRT error box (Moretti et al., GCN 6438 ). Limiting magnitude of a
combined image is based on USANO A2.0:

Mid time (UT),  Exposure,    R_Lim (3sigma)
May 20.753      6x300        21.0

The combined image can be found in
http://grb.rssi.ru/GRB070520B/GRB070520B_AZT11.gif

This message may be cited.

[GCN OPS NOTE(02jun07): The binary attachment was removed as well as the
diagnostics from MIMEDefang reacting to that binary.]
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