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 2190

GRB030429: Optical Observations
2003-05-01T23:45:41Z (21 years ago)
Vasilij Rumjantsev at CrAO <>
V.Rumyantsev (CrAO), A.Pozanenko (IKI) report:

We have imaged the error box of the HETE GRB030429 (HETE trigger 2695) with
AT-64 telescope of CrAO. Several unfiltered images with exposures of 120 s
were obtained in Apr. 29 between (UT) 18:19 and 20:57.  The OT found by
A.Gilmore at al. (GCN 2184) is marginally visible in co-added image. The
midtime of the co-added image (39x120 s) is Apr. 29.820. Due to short focal length 
of AT-64 (F=900mm, F/1.4)  the OT appears to be in the wing of the star

USNO A2.0  675-11945727
RA =12 13 07.92
DEC=-20 54 45.3
R=17.90  B=20.50

Star 1 in the image at

The limiting magnitude of the  image calibrated with USNO A2.0 catalog
R-band is 20.7, so we can estimate the OT magnitude as brighter as R=20.7m.
Our estimation is consistent with OT decay slope 2 which implies the
observation by  A.Gilmore at al. (GCN 2184).

Detailed calibration and PSF analysis is in a progress.
Looking for U.S. government information and services? Visit