Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 18767

V404Cyg Swift Trigger 668097: AbAO optical observations
2015-12-30T10:31:22Z (8 years ago)
Alexei Pozanenko at IKI, Moscow <>
E. Mazaeva (IKI),  R. Inasaridze (AbAO), A. Volnova (IKI), V. Ayvazian 
(AbAO), I. Molotov (KIAM), 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 AS-32 (0.7m) telescope of Abastumani Observatory. Observations 
started on Dec., 28 (UT) 16:19:10. We obtained several unfiltered images of 
60 s exposure. The source has a flare during our observations, the maximal 
brightness of the source during our observations is 15.5m at (UT) 16:22:39. 
It is also apparent that we observed only a small episode of new flaring 
activity of V404 Cyg.

Preliminary light curve of the V404 Cyg can be found in

Photometry is based on following USNO-B1.0 stars

USNO-B.1_id  R2

1238-0434779 13.52
1238-0434864 14.12
Looking for U.S. government information and services? Visit