TITLE: GCN CIRCULAR NUMBER: 38057 SUBJECT: LIGO/Virgo/KAGRA S241102br: MASTER observations and OT detection DATE: 24/11/03 10:35:54 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> P.Balanutsa, V.Lipunov, Ya.Kechin, K.Zhirkov, A.Kuznetsov, P.Balanutsa, A.Chasovnikov, O.Gress, N.Tiurina,E.Gorbovskoy, G.Antipov, D.Vlasenko, V.Senik, V.Topolev, Yu.Tselik, Siyu Wu, V.Vladimirov, D.Cheryasov, T.Pogrosheva, V.Shumkov, K.Vetrov (Lomonosov Moscow State University, SAI,Physics Department), D.Buckley (SAAO) C.Francile, F. Podesta, C.Lopez, R. Podesta (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,A.Corella,L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University), M.Gulyaev, K.Labsina (Lomonosov MSU) MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the LVC S241102br errorbox 3180 sec after notice time and 3335 sec after trigger time at 2024-11-02 13:36:33 UT, with upper limit up to 21.5 mag. The observations began at zenith distance = 10 deg. The sun altitude is -37.1 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the LVC S241102br errorbox 7936 sec after notice time and 8090 sec after trigger time at 2024-11-02 14:55:48 UT, with upper limit up to 17.8 mag. Observations started at twilight. The observations began at zenith distance = 24 deg. The sun altitude is -10.4 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the LVC S241102br errorbox 24564 sec after notice time and 24719 sec after trigger time at 2024-11-02 19:32:57 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 74 deg. The sun altitude is -28.0 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the LVC S241102br errorbox 35208 sec after notice time and 35363 sec after trigger time at 2024-11-02 22:30:21 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 46 deg. The sun altitude is -58.0 deg. MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the LVC S241102br errorbox 41867 sec after notice time and 42022 sec after trigger time at 2024-11-03 00:21:20 UT, with upper limit up to 19.4 mag. Observations started at twilight. The observations began at zenith distance = 70 deg. The sun altitude is -16.9 deg. The galactic latitude b = -15 deg., longitude l = 104 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/ligo_1.php?id=23593 MASTER-Tunka auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) new sources: 1. MASTER OT J230458.26+422347.1/AT2024aafy on 2024-11-02.57832 UT (RA, Dec) = 23h 04m 58.26s +42d 23m 47.1s on 2024-11-02.57832 UT. The OT magnitude in 'clear' filter is 17.6m (mlim= 19.0). The OT is seen in 2 images. There is no minor planet at this place. We have reference image on 2024-09-04.61126 UT with 'clear' filter 20.2m. 2.MASTER OT J225647.76+411630.3/AT2024aafw on 2024-11-02.59109 UT. at (RA, Dec) = 22h 56m 47.76s +41d 16m 30.3s on 2024-11-02.59109 UT. The OT magnitude in 'clear' filter is 18.8m (mlim = 20.2). We have reference image on 2024-06-16.73792 UT with 'clear' filter 19.9m. The nearest object is J225647.53+411629.0 in the CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2021) https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=II/365 This is possibly a red star against a dust cloud. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/ligo_1.php?id=23593 The received images are being compiled and processed. Observations and analysis are continued. View this GCN Circular online at https://gcn.nasa.gov/circulars/38057. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...