TITLE:   GCN CIRCULAR
NUMBER:  25712
SUBJECT: LIGO/Virgo S190910h Global MASTER-Net observations report 
DATE:    19/09/10 11:37:19 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov 
(Lomonosov Moscow State University, SAI, Physics Department),

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),

R. Rebolo, M. Serra 
(The Instituto de Astrofisica de Canarias),

D. Buckley 
(South African Astronomical Observatory),

O.A. Gres, N.M. Budnev, 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)




MASTER-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S190910h errorbox  9379 sec after trigger time at 2019-09-10 11:06:17 UT, with upper limit up to  18.5 mag. Observations started at twilight.  The observations began at zenit distance = 58 deg. The sun  altitude  is -11.4 deg. 

The galactic latitude b = -60 deg., longitude l = 98 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/ligo_1.php?id=10792

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

    9469 | 2019-09-10 11:06:17 |         MASTER-Amur | (00h 35m 19.061s , +39d 43m 52.06s) |   C |   180 | 18.3 |        
    9681 | 2019-09-10 11:09:48 |         MASTER-Amur | (00h 58m 02.961s , +41d 43m 35.15s) |   C |   180 | 18.3 |        
    9893 | 2019-09-10 11:13:21 |         MASTER-Amur | (01h 22m 21.252s , +43d 43m 36.45s) |   C |   180 | 18.4 |        
   10105 | 2019-09-10 11:16:52 |         MASTER-Amur | (00h 35m 19.334s , +39d 43m 46.44s) |   C |   180 | 18.5 |        
   10315 | 2019-09-10 11:20:22 |         MASTER-Amur | (00h 45m 45.264s , +39d 43m 37.68s) |   C |   180 | 18.5 |        
Filter C is a clear (unfiltred) band. 


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