GCN Circular 23682
Subject
GRB 190114A: GROND detection of the afterglow
Event
Date
2019-01-14T09:21:12Z (7 years ago)
From
Jan Bolmer at MPE/Garching <jan@bolmer.de>
J. Bolmer (MPE, Garching) and P. Schady (Univ. of Bath) report:
We observed the field of GRB 190114A (Swift trigger 883600; LaPorte et al., GCN #23677) 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 03:16 UT on 14th January, around 5 minutes after the GRB trigger. They were performed
at an average seeing of 1.4" and at an average airmass of 1.3.
We found a faint source within the 1.7 arcsec Swift-XRT error circle reported by Evans et al. (GCN #23681) at
RA (J2000.0) = 4:22:10.58
DEC (J2000.0) = +2:11:28.32
with an uncertainty of 0.25" in each coordinate.
Based on the first 6.5 min of exposure, we report the following preliminary JHK magnitudes:
J = 16.41 +/- 0.05 mag
H = 15.88 +/- 0.05 mag
K = 15.53 +/- 0.07 mag
The above magnitudes are calibrated against 2MASS and are not corrected for the expected
Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.19 in the direction
of theburst (Schlafly & Finkbeiner 2011).