Аннотация:Global MASTER-Net (http://observ.pereplet.ru, Lipunov et al., 2010, Advances in
Astronomy, vol. 2010, 30L) started inspect of the LIGO/Virgo S190425z
errorbox (Singer et al. GCN 24168) 3133 sec after trigger time at 2019-04-25
09:10:18 UT (Lipunov et al. GCN 24167).
After reviewing 25% of total probability, we found several possible
transients. The most interesting is the MASTER OT J155829.22+271714.6.
Most likely this flash is related to the activity of the galaxy nuclear.
Too large redshift s = 0.09 (distance ~380 Mpc) excludes OT from possible
candidates for a gravitational-wave event LIGO/Virgo S190425z.
MASTER OT J155829.22+271714.6 - Optical Flare in Active Seyfert Galaxy
MASTER-IAC (Teide Observatory, IAC, Tenerife, Spain) auto-detection system
discovered OT source at (RA, Dec) = 15h 58m 29.22s +27d 17m 14.63s
2019-04-25 23:42:39.4 UT.
The OT unfiltered magnitude is 18.4m (limit 19.7 m).
There is no minor planet at this place.
The discovery, referenceand differences images are available at
http://observ.pereplet.ru/images/MASTEROTJ155829.22+271714.6.jpg
The message may be cited.