GCN Circular 19052
Subject
GRB 160220B: Further GROND Observations
Event
Date
2016-02-22T14:04:03Z (10 years ago)
From
Philip Wiseman at MPE/Swift <wiseman@mpe.mpg.de>
P. Wiseman, J. Bolmer and J. Greiner (all MPE Garching) report on behalf
of the GROND team:
We once again observed the field of GRB 160220B (Swift trigger 674734;
Cummings et al., GCN #19029) simultaneously in g'r'i'z'JHK with GROND
(Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope
at ESO La Silla Observatory (Chile).
Based on 36.00 min of total exposures in r', at a mid-time of 08:55 UT
on 2016-02-22, ~1.9 days after the trigger, we do not detect any fading
in the source reported by Wiseman et al. (GCN #19042), placing a limit
on any magnitude change to < 0.1 mag in 24 hrs, in agreement with UVOT
observations ( De Pasquale et al., GCN #19051).
We therefore agree that this source is likely not the afterglow of GRB
160220B.