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

GCN Circular 3744

Subject
GRB050802: CrAO optical observations
Date
2005-08-03T11:02:17Z (19 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Pavlenko, Yu. Efimov, A. Shlyapnikov, A. Baklanov(CrAO), A.Pozanenko
(IKI), M. Ibrahimov (MAO) on behalf of larger GRB follow up collaboration
report:

We observed the error box of   GRB050802 (Band et al., GCN 3734) with 2.6m
Shain telescope (CrAO) on August 2 between (UT) 18:46 - 20:40. OT found by
McGowan et al. (GCN 3739) is clearly detected. Preliminary VRI photometry is
following:

Mean time  Exposure Filter Magnitude
 (UT)        s

18:54       60       V      20.6
20:27      2x60      V      21.1
18:48       60       R      20.6
20:36      2x60      R      21.0
18:56       60       I      20.2
20:39      2x60      I      20.6

with a typical error of 0.1m.

Comparing decay index of fading light curve in V between magnitudes obtained
in UVOT observation (McGowan et al. GCN 3739) and our first observation in
18:54, and decay index obtained based on our observations we suggest that
the break of OT light curve occurs between (UT) 19:00 - 20:40. Detailed
analysis is underway.

Finding chart of the OT in V band can be found in
http://grb.rssi.ru/GRB050902.

This message may be cited.
Looking for U.S. government information and services? Visit USA.gov