[vsnet-grb-info 23240] LIGO/Virgo S190814bv Global MASTER-Net optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25339
SUBJECT: LIGO/Virgo S190814bv Global MASTER-Net optical observations
DATE:    19/08/15 13:57:46 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov,  D.Vlasenko, P.Balanutsa, D.Vlasenko, V.Vladimirov,
D.Zimnukhov, A.Kuznetsov, P.Balanutsa,I.Gorbunov, A. Chasovnikov, F.Balakin, V.Grinshpun, T.Pogrosheva, 
A.Poznyakov (Lomonosov Moscow State University, SAI, Physics Department),
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov (Kislovodsk Solar Station ofthe Pulkovo Observatory),
R. Podesta, C. Lopez, C.Francile, F. Podesta (Observatorio Astronomico  Felix Aguilar OAFA, San Juan National University),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE,SJNU)
O. Gress, N.M. Budnev, O.Ershova (Applied Physics Institute, Irkutsk Stat University),
V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Education State University)


MASTER-Kislovodsk, MASTER-IAC and MASTER-OAFA robotic telescopes  (Lipunov et al. GCN 25322)
made a series of 9 images of  DESGW OTs area (2019nmd and 2019nme, M.Soares-Santos et al GCN 25336)
during last night since 2019-08-14 22:42:29 till 2019-08-15 05:43:57.

We do not see any OT at this position up to 18 mag this night
(Error-box-Altitude: 18deg; Sun_Alt: -47.2 deg., Moon_Alt:43.35 deg., Distane to Moon: 49 deg),
  and on 2018-11-03 00:13:30UT with m_lim=21.

Full Moon and cirrus made heterogeneous limits on different inspect images.

The list of times when we cover OTs area.
2019-08-15 05:43:57
2019-08-15 05:32:34
2019-08-15 03:42:43
2019-08-15 03:27:38
2019-08-15 00:56:36
2019-08-15 00:55:33
2019-08-15 00:42:49
2019-08-14 22:53:24
2019-08-14 22:42:29

During LVC S190814bv (LVC GCN 25324) error-box inspect (Lipunov et al. GCN 25322),
MASTER-IAC auto-detection system found
MASTER OT J003814.71-245902.0 - QSO flare at (RA, Dec) = 00h 38m 14.71s -24d 59m 02.0s on 2019-08-15.20078 UT.
The OT unfiltered magnitude is 15.3m (limit 18.6m).
We have reference images on 2015-09-14.09730 UT with m_OT=19.2 and unfiltered magnitude limit 21.0m.


The observation and reduction will be continued.
The message may be cited.