TITLE:   GCN CIRCULAR
NUMBER:  27481
SUBJECT: GRB 200325B: Mondy continued observations
DATE:    20/04/03 08:42:32 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI),  A. Pozanenko (IKI), E. Klunko (ISTP),  M. Eselevich
(ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:

We continued observations of the  MASTER OT J111012.51+274912.8 
(Lipunov et al., GCN 27446)  which is now is confirmed afterglow 
(Pozanenko et al., GCN 27452; Strausbaugh et al.,  GCN 27456; Klose et 
al.,  GCN 27464; D'Ai  et al.,  GCN 27471) of the Fermi GRB 200325B 
(Fermi GBM team, GCN 27441) with AZT-33IK 1.5-m telescope of Sayan 
observatory (Mondy).
Preliminary photometry of the OT is following.

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

2020-03-30  15:07:22 5.03063  R 30*120  22.40  0.20  22.7
2020-03-31  17:09:44 6.11561  R 30*120  22.45  0.17  22.8
2020-04-01  16:40:59 7.10254  R 40*120  n/d    n/d   22.6

the photometry is based on nearby SDSS-DR12 stars
RA         DEC       R(Lupton transformations)
167.569191 27.848262 16.015
167.513655 27.832992 16.930
167.510507 27.850424 15.261

A light curve of the GRB 200325B afterglow based on our observations 
(Belkin et al., GCNs 27455, 27465, 27467, 27468) can be found at 
http://grb.rssi.ru/GRB200325B/GRB200325B_lc.png