GCN Circular 9239
Subject
GRB 090424 optical observations
Event
Date
2009-04-24T23:40:52Z (17 years ago)
From
AAVSO GRB Network at AAVSO <matthewt@aavso.org>
Arto Oksanen (Hankasalmi Obs., Hankasalmi, Finland) reports via the AAVSO
International High Energy Network the following optical observations of
GRB 090424 (Cannizzo et al., GCN #9223):
A. Oksanen reports the detection of the optical counterpart of GRB 090424
approximately 6.5 hours post-burst. Unfiltered observations were made
using a 0.4-meter RC telescope with an SBIG STL-1001E CCD. A total of
sixty, 60-second observations were made having a mid-point time of
20:45:00 UT on 2009 April 24. The afterglow was detected with a magnitude
of 19.1 +/- 0.1 measured relative to the R band magnitude of USNO-A2.0
1050-06753889 (R=16.3). Astrometry of the afterglow position yields a
position of RA: 12h 38m 05.1s, Dec: +16d 50m 15.3s, in agreement with the
UVOT coordinates given by Cannizzo et al. (GCN #9223).
A jpeg preview of the observation showing the position of the afterglow is
available at this URL:
http://murtoinen.dyndns.org:8888/ccd/grb/GRB090424/GRB090424-S001-R0XX-Clear.jpg
A detailed report of the observation is available at the following URL:
ftp://ftp.aavso.org/grb/ArtoOksanen_GRB090424_2454946.42162_.txt
A FITS image of this observation is available at the following URL:
ftp://ftp.aavso.org/grb/ArtoOksanen_GRB090424_2454946.42162_.fits
The AAVSO thanks the Curry Foundation for their continued support of the
AAVSO International High Energy Network.