GCN Circular 23867
Subject
GRB 190204A: Mondy optical upper limit
Date
2019-02-04T18:55:55Z (5 years ago)
From
Alina Volnova at SAI MSU <alinusss@gmail.com>
A. Volnova (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), R. Inasaridze
(AbAO), E. Mazaeva (IKI), S. Belkin (IKI) report on behalf of
IKI-GRB-FuN:
We observed the field of localization of GRB 190204A (Lien et al. GCN
23852) with AZT-33IK telescope of Sayan observatory (Mondy). We
started observations on Feb. 04 (UT) 13:10:12 in R-filter. We do not
detect the optical afterglow (Lien et al. GCN 23852; Watson et al.,
GCN 23861; Kuin et al., GCN 23863). Preliminary photometry of the
field is following.
Date UT start t-T0 Filter Exp. OT Err.
UL
(mid, days) (s)
(3 sigma)
2019-02-04 13:10:12 0.32583 R 25*120 n/d n/d 20.3
The photometry is based on nearby SDSS stars:
SDSS_id R_Lupton
J232549.70+545348.8 16.978 0.014
J232550.46+545253.5 17.052 0.014
J232544.33+545253.6 16.085 0.013
Our observation confirm rapid initial decay of the afterglow detected by
UVOT (Kuin et al., GCN 23863).