GCN Circular 23024
Subject
GRB 180720B: D50 optical observations
Date
2018-07-23T20:21:57Z (6 years ago)
From
Jan Strobl at AI AS CR,Ondrejov <jan@strobl.cz>
M. Jelinek, J. Strobl, R. Hudec, C. Polasek (ASU CAS Ondrejov)
report:
We observed the position of the bright GRB 180720B (Siegel et al., GCN
22973 & GCN 22975) with the D50 telescope of the Astronomical Institute
Ondrejov, near Prague, Czech Republic. We performed a series of ~300x 20s
unfiltered exposures as soon as the position became accessible above local
horizon, between 9.8 and 12h after the trigger.
The optical afterglow (Martone et al., GCN 22976; Sasada et al., GCN
22977; Reva et al., GCN 22979; Itoh et al., GCN 22983) is clearly detected
in single 20 s images.
We confirm the stationary behaviour during our observations as reported by
Kann et al. (GCN 22985) - the afterglow might have faded as few as 0.04
mag between 10 and 11h after the GRB trigger.