Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 28656

GRB 201015A: CrAO/ZTSH optical observations
2020-10-16T15:31:16Z (4 years ago)
Alexei Pozanenko at IKI, Moscow <>
S. Belkin (IKI),  N. Pankov (HSE), A. Pozanenko (IKI), V. Rumyantsev 
(CrAO),  A. Volnova (IKI)  report on behalf of larger GRB follow-up 

We observed the GRB 201015A  (D'Elia et al., GCN 28632) with ZTSH 2.6m 
telescope of CrAO observatory between Oct. 16 (UT) 01:02:14 -- 02:52:23. 
  The optical afterglow  (e.g., Lipunov et al., GCN 28633; Kennea et 
al., GCN 28635; Malesani et al., GCN 28637; Ackley et al., GCN 28639; Hu 
et al., GCN 28645; Zhu et al., GCN 28653) at redshift z=0.426 (de Ugarte 
Postigo et al., GCN 28649) is clearly detected in each frame of 120 s 
exposure in R filter.

The exact photometry of the afterglow depends on the underlying object 
visible and presented in PS1 catalogue (i'=19.6), which may be a host 
galaxy (PS1 magnitude i'=19.6). Preliminary photometry of the afterglow 
in a combined image is following

Date      UT start   t-T0    Filter Exp.     OT      err    UL(3sigma)
                      (mid, days)       (s)

2018-10-16 02:19:26  0.15501 R      12*120   20.66   0.05   23.0

The photometry is based on several nearby USNO-B1.0 stars
USNO-B1.0_id R2
1434-0471702 17.51
1434-0471746 18.23
Looking for U.S. government information and services? Visit