GCN Circular 9907
Subject
GRB 090912 optical upper limit
Event
Date
2009-09-13T10:17:51Z (16 years ago)
From
AAVSO GRB Network at AAVSO <matthewt@aavso.org>
Arto Oksanen (Hankasalmi Obs., Hankasalmi, Finland) reports to the AAVSO
International High Energy Network the following optical observations of
the field of GRB090912 (GCN Circ. #9905, Ukwatta et al.):
A. Oksanen reports an upper limit on the optical afterglow of CR=21.6,
measured relative to USNO-A2.0 1500-05568008 (R=15.7). The X-ray
afterglow position (Beardmore et al., GCN #9906) was observed using the
0.4-m Hankasalmi Observatory RC telescope with an SBIG STL-1001E CCD
camera and clear filter. A total of 57 one-minute exposures were
obtained, with the mid-point of the exposures at 2009 Sept 12 19:33 UT,
approximately 3.7 hours post-burst. Two faint stars near the burst
location are present in DSS2 images, but there is no transient source at
the burst location to a limit of CR=21.6.
A detailed report of these observations may be found at the following URL:
ftp://ftp.aavso.org/grb/ArtoOksanen_GRB090912_2455087.38910_.txt
A fits image is also available at
ftp://ftp.aavso.org/grb/ArtoOksanen_GRB090912_2455087.38910_.fits
The AAVSO thanks the Curry Foundation for its support of the
AAVSO International High Energy Network.