[AAVSO-HEN] GRB 090107B optical observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  8788
SUBJECT: GRB 090107B optical observations
DATE:    09/01/07 17:53:05 GMT
FROM:    Arne A. Henden at AAVSO  <arne at aavso.org>

Arto Oksanen (Hankasalmi Obs., Hankasalmi, Finland) reports via the
AAVSO High Energy Network the following optical observations of the
INTEGRAL burst GRB 090107B (Gotz et al., GCN Circular #8786):

Unfiltered observations were made using a 0.4-meter RC telescope
with an SBIG STL-1001E CCD.  The full INTEGRAL error box was
observed unfiltered starting at 16:35UT, 15 minutes after the
burst.  Combining ten 60-second exposures, we do not see any
optical afterglow to a limiting magnitude of 20.5 (compared
with the DSS2 red plate).

A FITS image of this observation is available at the following URL:
ftp://ftp.aavso.org/grb/ArtoOksanen_GRB090107_2454839.23238_.fits

The AAVSO thanks the Curry Foundation for their continued support of the
AAVSO International High Energy Network.