Аннотация:MASTER Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,vol. 2010, 30L)
automatically started LIGO/Virgo S190412m alert observations (Sjawhan et al. GCN 24098)
MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan
National University) was pointed to the LIGO/Virgo S190412m alert
20 sec after notice time and 3839 sec after trigger time at 2019-04-12 06:34:43 UT.
The 5-sigma upper limit has been about 18.16mag on the first image.
Reduction and observation will be continued.
The message may be cited.