GCN Circular 10011
Subject
GRB 091010 optical upper limits
Event
Date
2009-10-11T11:29:01Z (16 years ago)
From
AAVSO GRB Network at AAVSO <matthewt@aavso.org>
Arto Oksanen and Eric Southgate (The Hermitage Observatory, Sunshine
Coast, QLD, Australia) report to the AAVSO International High Energy
Network the following optical observations of the field of GRB 091010 (GCN
Circ. #10004, Donnarumma et al.):
A. Oksanen and E. Southgate report an upper limit of approximately CR=17.5
on the optical afterglow of GRB 091010 (GCN Circ. #10004, Donnarumma et
al.). The afterglow upper limit was measured relative to the star
USNO-B1.0 0674-0991959. A single, 120-second observation was made using
an A&M 130-mm TMB APO with an SBIG ST2000 CCD camera and no filter. The
mid-point of the exposure was 2009 October 10, 11:19:17 UT, approximately
8.6 hours after the SuperAGILE trigger. The entire error box of the burst
centered on RA 19h 54m 40.51s , Dec -22d 32m 17.36s was imaged; no new
sources were detected using visual comparison of the CCD image with the
DSS2 R-band plate of the area.
A stacked, 10 x 120-second image was also created from subsequent images
of the field using the same camera. The midpoint of this image was 2009
October 10 11:47 UT, approximately 9.0 hours after the burst. This image
was visually examined, and no candidate objects were found; the image
extends to approximately the same depth as the DSS2 red plate.
A FITS image of the initial observation is available at the following URL:
ftp://ftp.aavso.org/grb/ArtoOksanen_GRB091010_2455115.12128_.fits
The AAVSO thanks the Curry Foundation for its support of the AAVSO
International High Energy Network.