GCN Circular 8983
Subject
GRB 090313, GROND observations
Date
2009-03-13T10:34:51Z (15 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
A. C. Updike (Clemson University), S. Klose (Tautenburg), C. Clemens
and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 090313 (Swift trigger 346386; Mao et al.
2009, GCN 8980) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2m ESO/MPI telescope at La Silla
Observatory (Chile).
Observations started at 09:13 UT on March 13, 7 minutes after the GRB
trigger. We confirm that the afterglow candidate reported by Chornock et
al. (GCN 8979) is bright in all bands.
We measure the following preliminary magnitudes at a mean time of about 10
minutes after the burst (Vega mags):
J = 14.0 +/- 0.1
H = 13.1 +/- 0.1
K = 12.3 +/- 0.1
calibrated against 2MASS field stars. Astrometry gives RA, DEC (J2000) =
13:13:36.21, +08:05:49.2 (+/- 0.5 arcsec). As already noted by Chornock
et al., the afterglow is close to a bright galaxy.
These are preliminary data. Data reduction is in progress.