GCN Circular 4909
Subject
GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
Event
Date
2006-03-23T23:17:25Z (20 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. A. Kann, B. Stecklum (TLS Tautenburg) report:
The field of GRB 060323 (Vetere et al., GCN 4904) was observed with the 1.34m
Tautenburg Schmidt telescope under excellent conditions in BVRcIc.
The observation log is the following:
Midtime Exp Filter lim. Mag
0.1948 6 * 600 s Ic 21.8
0.2227 1 * 600 s Rc 22.5
0.2309 1 * 600 s V 22.5
0.2385 1 * 600 s B 22.5
Limiting magnitudes were derived via comparison with SDSS pre-burst observations
(Cool et al., GCN 4905).
For the star at
RA= 174.38742 (11:37:32.98)
Dec = +50.02251 (+50:01:21.04)
I derive via the transformation equations of Lupton (2005) and the SDSS
photometry:
B = 19.187
V = 18.848
Rc = 18.654
Ic = 18.002
with typical erros of 0.03 mags. Aperature photometry instrumental magnitudes are
then compared with the magnitudes of sources near the detection limit. The limiting
magnitudes may be improved with further analysis.
There is no source detected at the position of the possible UVOT afterglow (Vetere
et al., GCN 4904).
At the position of the X-ray afterglow (Kennea et al., GCN 4908), we detect a faint
source (Rc ~ 21) at
RA= 11:37:44.56
Dec = +49:58:59.8
that is not visible in the SDSS (limiting mag ~ r = 23).
We suggest this source as the possible afterglow of GRB 060323.
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