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GCN Circular 30064

ZTF21aayokph (AT2021lfa): continued Assy optical observations
2021-05-21T06:58:41Z (3 years ago)
Alexei Pozanenko at IKI, Moscow <>
N. Pankov (HSE, IKI),  S. Belkin (IKI), V. Kim (FAI, Pulkovo 
Observatory), M. Krugov (FAI), A. Pozanenko (IKI), report on behalf of 

We observed the field of  ZTF21aayokph (AT2021lfa) (Yao et al., GCN 
29938) with AZT-20 telescope of Assy-Turgen observatory on 2021-05-17 
and  2021-05-18.

We still detect the optical transient (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; 
Pankov et al., GCN 29964).

Preliminary photometry of the optical transient  is following

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

2021-05-17 16:19:12  n/a       200*60   r'      23.60  0.28   23.9
2021-05-18 15:52:05  n/a       230*60   r'      23.67  0.29   24.0

The photometry is based on the nearby SDSS-DR12 stars.
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