Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 23702

GRB 190114C: GROND detection of the afterglow
2019-01-15T01:58:25Z (5 years ago)
Jan Bolmer at MPE/Garching <>
J. Bolmer (MPE, Garching) and P. Schady (Univ. of Bath) report:

We observed the field of GRB 190114C (Swift trigger 883832; Gropp et al., GCN #23688) 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 the ESO
La Silla Observatory (Chile).

Observations started at 00:48 UT on 15th January, around 3.8 hours after the GRB trigger. They were performed
at an average seeing of 1.0" and at an average airmass of 1.0. 

We found a source consistent with the one reported by Selsing et al., GCN #23695.

Based on the first 5.8 min of exposure in g'r'i'z', and 8.0 min in JHK, we report the
following preliminary AB magnitudes:  

g =  19.00 +/- 0.09 mag
r = 18.17 +/-  0.03  mag
i =  17.66 +/- 0.05 mag
z = 17.15 +/-  0.04 mag
J = 16.76 +/- 0.05 mag
H = 16.30 +/- 0.05 mag
K = 16.08 +/- 0.07 mag

The above magnitudes are calibrated against PanSTARRS and 2MASS and are not corrected for the expected
Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.01 in the direction
of the burst (Schlafly & Finkbeiner 2011).
Looking for U.S. government information and services? Visit