TITLE:   GCN CIRCULAR
NUMBER:  29964
SUBJECT: ZTF21aayokph (AT2021lfa): continued Mondy optical observations
DATE:    21/05/07 21:58:07 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin 
(IKI) report  on behalf of GRB IKI FuN:

We continued observation of the ZTF21aayokph (AT2021lfa) (Yao et al., 
GCN 29938; Watson et al., GCN 29940; Butler et al., GCN 29941; Yao et 
al., GCN 29945; Fu et al., GCN 29948; Kim  et al., GCN 29950; O'Connor 
et al., GCN 29952; Ho et al., GCN 29953; Pankov et al., GCN 29954; 
Lipunov et al., GCN 29959) with AZT-33IK telescope of Sayan observatory 
(Mondy).

Preliminary photometry of the optical transient is following

Date       UT start    Filter Exp.   OT    Err.  UL(3sigma)
                               (s)

2021-05-06 16:01:16    R      30*120  22.60 0.14 22.9

The photometry is based on the nearby USNO-B1.0 star
USNO-B1.0_id R2
0884-0227886 14.13