GCN Circular 1861
Subject
GRB 030204: Optical Observations
Date
2003-02-07T18:25:09Z (21 years ago)
From
Melissa Nysewander at UNC,Chapel Hill <mnysewan@astro.unc.edu>
M. Nysewander (U. North Carolina), A. Henden (USRA/USNO), M.
Lopez-Morales, D. Reichart (U. North Carolina), and M. Schwartz (Tenagra
Observatories) report on behalf of a larger collaboration:
We observed the entire ~73 square arcminute error box of GRB 030204 (GCN
1854) beginning 11.5 hours after the burst (GCNs 1856, 1858) in BVRcIc and
beginning 38.2 hours after the burst in Rc. Using the field calibration of
Henden (GCN 1860), we report the following 3-sigma limiting magnitudes:
Date Mean Time Filter Integration Limiting Telescope*
Since GRB Time (sec) Magnitude
(hours) x Pointings
Feb 5.011 11.5 Rc 1500 x 3 20.0 0.6-meter MO
Feb 5.042 12.2 Ic 3600 x 1 19.3 0.2-meter PST
Feb 5.108 13.8 Rc 900 x 2 21.5 1.0-meter USNO
Feb 5.133 14.4 B 480 x 2 22.0 1.0-meter USNO
Feb 5.133 14.4 V 300 x 2 21.7 1.0-meter USNO
Feb 6.122 38.2 Rc 1800 x 2 22.9 1.0-meter USNO
Feb 6.124 38.2 Rc 2700 x 2 21.7 0.8-meter TII
*MO = Morehead Observatory telescope; PST = Pisgah Survey Telescope at the
Pisgah Astronomical Research Institute (PARI); TII = Tenagra II telescope.
Using the image subtraction routine ISIS2 (Alard 2000), we find no
transient sources in either of our Rc images of February 4th when compared
to either of our Rc images of February 5th.
Alard, C. 2000, A&AS 114, 363