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GCN Circular 20012

GRB 161004A: Maidanak optical observations
2016-10-08T00:26:58Z (8 years ago)
Alexei Pozanenko at IKI, Moscow <>
E. Mazaeva (IKI), A. Pozanenko (IKI), B. Hafizov (UBAI), A. Volnova 
(IKI), O. Burhonov (UBAI) report on behalf of larger GRB follow-up 

We observed the field of GRB 161004A  (Evans  et al., GCN 19979) with 
AZT-22 telescope of Maidanak observatory equipped with SNUCAM in R 
filter starting on Oct. 04 (UT) 14:25:10. We  clearly detected optical 
afterglow  (Evans  et al., GCN 19979; Breeveld et al., GCN 19984; 
Mazaeva et al., GRB 20011). Preliminary photometry  of the afterglow in 
a combined image is following

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

2016-10-04   14:25:10  0.06981  R        15*120   22.0  0.15   22.7

Photometry is based on nearby SDSS-DR9 stars used in GCN 19980.
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