Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 6485

GRB070520B: optical observations
2007-06-02T16:32:32Z (17 years ago)
Vasilij Rumjantsev at CrAO <>
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

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.]
Looking for U.S. government information and services? Visit