//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26263 SUBJECT: LIGO/Virgo S191120aj: Retraction of GW compact binary merger candidate DATE: 19/11/20 16:48:48 GMT FROM: Leo Singer at GSFC The LIGO Scientific Collaboration and the Virgo Collaboration report: The trigger S191120aj is no longer considered to be a gravitational wave signal. The signal is attributed to periodic glitches in L1 caused by ground motion due to forestry activities near the site. The signal in H1 is not significant by itself. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26264 SUBJECT: LIGO/Virgo S191120aj: Global MASTER-Net observations report DATE: 19/11/20 16:50:00 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-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 S191120aj errorbox 572 sec after notice time and 1096 sec after trigger time at 2019-11-20 16:41:50 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 73 deg. The sun altitude is -32.4 deg. The galactic latitude b = 66 deg., longitude l = 45 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/ligo_1.php?id=10927 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1186 | 2019-11-20 16:41:50 | MASTER-Kislovodsk | (16h 14m 13.05s , +41d 52m 15.3s) | C | 180 | 18.4 | 1186 | 2019-11-20 16:41:50 | MASTER-Kislovodsk | (16h 03m 31.42s , +42d 17m 44.2s) | C | 180 | 19.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.