[vsnet-grb-info 25505] GRB 200412B: continued Terskol optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  27605
SUBJECT: GRB 200412B: continued Terskol optical observations
DATE:    20/04/19 13:50:32 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

S. Belkin (IKI), A. Pozanenko (IKI), A.V. Shein (INASAN), I.A. Izvekova 
(ICAMER NASU), E. Mazaeva (IKI), A. Volnova  (IKI) report on behalf of 
GRB IKI FuN:

We observed the field of GRB 200412B (Fermi GBM team, GCN 27547; Mailyan
et al., GCN 27558; see also Burgess et al., GCN 27548; Longo et al., GCN
27557; Page et al., GCN 27561; Gupta et al., GCN 27563; Zheng et al., 
GCN 27565)  with Zeiss-2000 of Mt.Terskol observatory.  We  marginally 
detected  the afterglow of GRB 200412B  (Lipunov et al., GCNs 27555, 
27556; see also e.g. Kumar et al., GCN 27564; Belkin et al., GCN 27566, 
Stecklum et al., GCN 27567, Moskvitin GCN 27570; Xin  et al., GCN 
27571).  Preliminary photometry of the afterglow is following.

Date       UT start  t-T0       Filter  OT Err. UL   Observatory
                     (mid, days)
2020-04-18 19:52:22 6.47687 43*120 R 23.6 0.3 23.6 Terskol Z-2000

The photometry is based on nearby USNO-B1.0 stars.
The update light curve can be found at 
http://grb.rssi.ru/GRB200412B/GRB200412B_LC.png