LIGO/Virgo S190829u

The LIGO Scientific Collaboration and the Virgo Collaboration report:

After human inspection, the trigger S190829u is no longer considered to be
a candidate of interest due to a data quality issue in the LIGO Livingston
detector.

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-IAC robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Spain (IAC Teide Observatory) started inspect of the LIGO/Virgo S190829u errorbox  44 sec after trigger time at 2019-08-29 21:06:40 UT, with upper limit up to  19.0 mag. The observations began at zenit distance = 75 deg. The sun  altitude  is -21.6 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S190829u errorbox  30 sec after notice time and 472 sec after trigger time at 2019-08-29 21:13:48 UT, with upper limit up to  19.7 mag. The observations began at zenit distance = 42 deg. The sun  altitude  is -59.8 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=10754

We obtain a following upper limits.  

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

     135 | 2019-08-29 21:06:40 |          MASTER-IAC | (12h 07m 00.735s , +44d 06m 53.34s) |   C |   180 | 18.4 |        
     135 | 2019-08-29 21:06:41 |          MASTER-IAC | (12h 18m 21.888s , +44d 02m 52.22s) |   C |   180 | 18.8 |        
     390 | 2019-08-29 21:10:55 |          MASTER-IAC | (12h 26m 45.951s , +42d 07m 18.93s) |   C |   180 | 18.4 |        
     390 | 2019-08-29 21:10:56 |          MASTER-IAC | (12h 37m 45.322s , +42d 03m 14.66s) |   C |   180 | 19.0 |        
     518 | 2019-08-29 21:13:48 |         MASTER-SAAO | (00h 33m 07.564s , -40d 40m 17.97s) |   C |    90 | 19.7 |        
     649 | 2019-08-29 21:15:15 |          MASTER-IAC | (12h 35m 55.348s , +40d 03m 15.38s) |   C |   180 | 18.9 |        
Filter C is a clear (unfiltred) band. 


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