TITLE:   GCN CIRCULAR
NUMBER:  30365
SUBJECT: GRB 210702A: Chilescope optical observations
DATE:    21/07/03 12:48:04 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI), A. Pozanenko (IKI), N. Pankov (HSE, IKI), M. Krugov 
(FAI)  report on behalf of GRB IKI FuN collaboration:

We observed the field of Swift GRB 210702A (Lien  et al., GCN 30351) 
with Chilescope RC-1000 starting on 2021-07-02 (UT)  23:40:26 in 
r'-filter. Within enhanced XRT position (D'Elia et al., GCN 30358) we 
clearly detect the afterglow (Lien  et al., GCN 30351; Lipunov et al., 
GCN 30352; Groot et al., GCN 30354; Kuin et al., GCN 30355; Kuin et al., 
GCN 30356; Xu et al., GCN 30357; Romanov  et al., GCN 30364).

Preliminary photometry of the afterglow is following

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

2021-07-02 23:40:26 0.193202 r' 1*600 17.01  0.05  19.7


The photometry is based on nearby stars from the APASS_DR8

RA DEC r
11:14:16.46880 -36:49:58.2132 15.187
11:14:36.96576 -36:48:30.0132 15.320