[vsnet-grb-info 17354] V404Cyg Swift Trigger 668097: TSHAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18721
SUBJECT: V404Cyg Swift Trigger 668097: TSHAO optical observations
DATE:    15/12/24 18:31:34 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin 
(Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) 
report on behalf of larger GRB follow-up collaboration:

We observed V404 Cyg after Swift BAT trigger 668097 (Barthelmy et al., 
GCN 18716) with Zeiss-1000 (East) 1-m telescope of Tien Shan 
Astronomical Observatory. Observations started on Dec., 23 (UT) 
12:19:13. We obtained 165 images in R-filter of 30 s exposure.

Preliminary light curve 
http://grb.rssi.ru/V404_Cyg/v404Cyg_20151223_lc.pngof the V404 Cyg can 
be found in http://grb.rssi.ru/V404_Cyg/v404Cyg_20151223_lc.png

Photometry is based on following USNO-B1.0 stars

ID              R2
USNO-B1.0_id	R2
1238-0435152	15.98
1239-0424177	14.99
1239-0424179	15.61
1238-0435111	16.33