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 2606

GRB 040606: Optical observations
2004-06-07T16:06:50Z (20 years ago)
Gerald Bourban at Geneva Observatory <>
G.Bourban, F.Carrier, G.Burki and L.Weber (Geneva Observatory, 
Switzerland) report:

We have carried out optical observations of the 12'x 12' field centered 
on the error circle of HETE trigger #3316 (~23% of the whole uncertainty 
area provided by HETE/WXM) using the C2 CCD Camera mounted on the Swiss 
1.2-meter telescope located at the ESO La Silla Observatory (Chile). The 
observations began on 2004 June 06 at 23:08:03 UT (9.84 h after the 
burst). We obtained 5 R-filtered images with exposure times of 180 and 
480 s under non optimal wheather conditions and with a relatively high 
airmass (Fz ~2.5).

The division of these images as well as their comparison with the 
USNO-A2 catalog did not reveal any new or fainting source inside the 
field of view of the C2 camera, down to a limiting magnitude of R < 20.5.

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