//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25554 SUBJECT: LIGO/Virgo S190829u: Retraction of GW compact binary merger candidate DATE: 19/08/29 21:32:40 GMT FROM: Olivier Minazzoli at LIGO Virgo Collaboration 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25556 SUBJECT: LIGO/Virgo S190829u Global MASTER-Net observations report DATE: 19/08/29 21:41:40 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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.