GCN Circular 17372
Subject
GRB 150201A: GROND upper limits
Date
2015-02-02T14:54:42Z (10 years ago)
From
Fabian Knust at MPE/GROND <fknust@mpe.mpg.de>
F. Knust, T. Schweyer, J. Bolmer, J. Greiner (all MPE Garching) report on behalf of the GROND team:
We
observed the field of GRB 150201A (Swift trigger 629302; J. K. Cannizzo
et al., GCN #17368) simultaneously in g'r'i'z'JHK with GROND (Greiner
et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La
Silla Observatory (Chile). Observations
started at 00:47 UT on 2015-02-02, 11hrs after the GRB trigger. They
were performed at an average seeing of 1.64" and at an average airmass
of 2.1. We do not detect a source within the Swift-XRT error circle reported by J.P. Osborne et al. (GCN #17369) down to
g' > 23.2 mag, r' > 23.1 mag, i' > 23.5 mag, z' > 23.6 mag, J > 21.5 mag, H > 21.0 mag, and K > 19.4 mag.
The
given limits are derived based on calibrating the images against GROND
zeropoints and 2MASS field stars and are not corrected for the Galactic
foreground extinction corresponding to a reddening of E_(B-V)= 0.012 in
the direction of the burst (Schlegel et al. 1998).