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GCN Circular 25474

Subject
LIGO/Virgo S190814bv: MASTER prediscovery and postdiscovery observations DECam candidate DG19wxnjc/AT2019npv field
Date
2019-08-25T15:40:32Z (6 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, D. Vlasenko,  E. Gorbovskoy, F.Balakin, N.Tyurina,
V. Kornilov, I.Gorbunov, P.Balanutsa, A.Kuznetsov,  V. Vladimirov,
D.Zimnukhov, V. Senik, A.Chasovnikov, 
A.Pozdnyakov,D.Kuvshinov, V. Topolev (Lomonosov Moscow State University, 
SAI, Physics Department),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias IAC),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix
Aguilar OAFA),
H. Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio
ICATE),
D. Buckley (South African Astronomical Observatory SAAO),
  N.M. Budnev, O. Gress, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State
University)



All observations was done under the MASTER target of opportunity program 
that includes the results of population synthesis  by Scenario Machine 
(Lipunov et al., "First LIGO events: 
binary black holes mergings", New Astronomy, Vol. 2,  p. 43-52, 1997).
There are number arhive images just before trigger.
One (GCN 25354Loading...
 
 )  of our previous circulars was sent erroneously. Here we 
give the correct schedule of our observations.

MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar 
Station of Pulkovo observatory) started inspect of the LIGO/Virgo 
S190814bv errorbox  1327 sec after trigger time at 2019-08-14 21:32:46 UT 
(Lipunov et al., GCN 25322Loading...
 
 ).

MASTER-SAAO robotic telescope  located in South Africa (South African 
Astronomical Observatory) started inspect of the LIGO/Virgo S190814bv 
errorbox  1351 sec after trigger time at 2019-08-14 21:33:10 UT, with 
upper limit up to  19.4 mag (Lipunov et al., GCN 25322Loading...
 
 ).

MASTER-Tavrida robotic telescope  located at Crimea started
inspect of the LIGO/Virgo S190814bv errorbox  1373 sec after trigger time
at 22019-08-14  21:33:32 UT.


MASTER-IAC robotic telescope  located at Tenerife (Spain) started inspect 
of the LIGO/Virgo S190814bv errorbox  4200 sec after trigger time at 
2019-08-14 22019-08-14 22:20:39 UT.

Our coadded images limit is:

  10367 | 2019-08-15 00:01:56 |   C |  1440 | 20.6  |  Coadd
  11174 | 2019-08-15 00:12:22 |   C |   540 | 19.9  |  Coadd
  22253 | 2019-08-15 03:20:01 |   C |   360 | 19.3  |  Coadd
  87165 | 2019-08-15 21:23:44 |   C |   360 | 18.5  |  Coadd
  97387 | 2019-08-16 00:13:46 |   C |   540 | 19.0  |  Coadd
 108618 | 2019-08-16 03:20:57 |   C |  1080 | 19.3  |  Coadd
 ~5 days| 2019-08-20 21:00:43 |   C |   540 | 20.1  |  Coadd
 ~6 days| 2019-08-21 19:55:47 |   C |   540 | 20.7  |  Coadd

We see host galaxy and OT on some images.
For example Robot find MASTER OT J005332.32-234958.5 at 23 Aug:

        Date                   RA              Dec      Tube    OT mag
                                                              unfiltered
2019-08-23 02:45:31.4 00h 53m 32.32s, -23d 49m 58.48s   W     20.1



However, the object is visible at the limit and therefore reduction is 
continuated.
The  Alert page is availabl at
https://master.sai.msu.ru/site/master2/ligo_1.php?id=10685&nb=1

This message can be cited.

[GCN OPS NOTE(26aug19): Per author's request, the "LIGO/Virgo" prefix
was added to the Subject line.]