[vsnet-grb-info 25510] GRB 200412B: continued Mondy and Terskol optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  27610
SUBJECT: GRB 200412B: continued Mondy and Terskol optical observations
DATE:    20/04/20 19:47:32 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. Klunko (ISTP),  M. Eselevich (ISTP), 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  AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) 
and Zeiss-2000 of Mt.Terskol observatory.  We  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)
2020-04-19 16:10:31 7.32142 41*120 R 23.50 0.30 23.6 Mondy AZT-33IK
2020-04-19 22:23:48 7.59245 48*120 R 23.55 0.28 23.7 Terskol Z-2000

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