GCN Circular 18189
Subject
GRB 150818A: continued Mondy optical observations
Date
2015-08-21T15:39:24Z (9 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), E. Klunko (ISTP), A. Volnova (IKI), I. Korobtsev
(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We continue observations of the of Swift GRB 150818A (D'Elia et al.,
GCNC 18152) with AZT-33IK telescope of Sayan observatory (Mondy). We
obtained several images in R-filter starting on Aug., 20 (UT)
16:54:32. The optical transient (Marshall et al., GCN 18155; McCauley
et al., GCN 18161; Schulze et al., GCN 18164; Mazaeva et al., GCN
18175) is clearly visible. Preliminary photometry of the optical
transient is following
Date UT start t-T0 Filter Exp. OT Err.
(mid, days) (s)
2015-08-20 16:54:32 2.23334 R 15*120 21.15 0.09
Photometry is based on USNO-B1.0 stars referenced in (Mazaeva et al.,
GCN 18175).
The continued shallow decay mentioned in Schulze et al. (GCN 18179)
indeed can be explained by underlying host galaxy (Sanchez-Ramirez et
al., GCN 18177).