TITLE:   GCN CIRCULAR
NUMBER:  31625
SUBJECT: ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
DATE:    22/02/21 20:28:05 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

Pankov (HSE),  I. Sokolov (INASAN, KIAM),  V. Kozlov (IC AMER), Y. 
Markelov (KIAM), I. Izvekova (Institute of physics of NAS, IC AMER 
NASU), Y. Markus (Institute of physics of NAS, IC AMER NASU),  G. 
Butenko (Institute of physics of NAS),  A. Pozanenko (IKI), S. Belkin 
(IKI, HSE) report on behalf of GRB IKI FuN:

We observed the optical transient of  ZTF22aaajecp/AT2022cmc  (Andreoni
et al., GCN 31590) with K-800 telescope, and Zeiss-600 telescope of 
Terskol observatory on Feb. 15 and Feb. 17. We detected the optical 
transient (Andreoni et al., GCN 31590; GСN-bibliography in  Tanvir et 
al.,  GCN 31602; see also Lipunov et al., GCN 31600) at the redshift of 
z=1.193  (Tanvir  et al., GCN 31602; Lundquist et al., GCN 31612) in 
first epoch observation with K-800 in Clear filter. Preliminary 
photometry of the transient and upper limit is following


Date UT start t-T0 Filter Exp. OT Err UL(3sigma) Telescope

2022-02-15 23:15:36 4.939271 C     93*30  20.15  0.2  20.9 K-800
2022-02-17 00:38:05 5.994641 C     88*30  n/d    n/d  20.4 K-800

The photometry is based on the nearby SDSS-DR12 stars R (Lupton
transformations)
R.A. Dec R
203.7398307 33.1702037 17.794
203.7684775 33.1572431 17.347