TITLE: GCN CIRCULAR NUMBER: 27788 SUBJECT: IceCube Alert 200523.10: Global MASTER-Net observations report DATE: 20/05/23 04:13:08 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, D. Cheryasov (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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the IceCube Alert 200523.10 (trigger No 58596690,22h 35m 39.12s , +02d 08m 56.4s, R=1.56) errorbox 30 sec after notice time and 3994 sec after trigger time at 2020-05-23 03:36:42 UT, with upper limit up to 20.0 mag. The observations began at zenith distance = 41 deg. The sun altitude is -22.8 deg. MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) started inspect of the IceCube Alert 200523.10 errorbox 51 sec after notice time and 4015 sec after trigger time at 2020-05-23 03:37:03 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 62 deg. The sun altitude is -28.3 deg. The galactic latitude b = -46 deg., longitude l = 70 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1363593 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 4084 | 2020-05-23 03:36:42 | MASTER-SAAO | (22h 37m 53.79s , +02d 04m 34.7s) | C | 180 | 18.8 | 4084 | 2020-05-23 03:36:42 | MASTER-SAAO | (22h 30m 48.99s , +02d 03m 26.1s) | C | 180 | 19.7 | 4105 | 2020-05-23 03:37:03 | MASTER-IAC | (22h 34m 39.92s , +02d 03m 55.4s) | P| | 180 | 17.9 | 4285 | 2020-05-23 03:37:03 | MASTER-IAC | (22h 34m 39.92s , +02d 03m 55.4s) | P| | 540 | 18.5 | Coadd 4106 | 2020-05-23 03:37:03 | MASTER-IAC | (22h 33m 57.37s , +02d 07m 52.5s) | P- | 180 | 17.9 | 4286 | 2020-05-23 03:37:03 | MASTER-IAC | (22h 33m 57.38s , +02d 07m 52.5s) | P- | 540 | 18.5 | Coadd 4284 | 2020-05-23 03:40:01 | MASTER-SAAO | (22h 37m 57.53s , +02d 06m 16.8s) | C | 180 | 18.7 | 4284 | 2020-05-23 03:40:01 | MASTER-SAAO | (22h 30m 52.70s , +02d 05m 09.5s) | C | 180 | 20.0 | 4345 | 2020-05-23 03:41:02 | MASTER-IAC | (22h 34m 40.02s , +02d 04m 49.3s) | P| | 180 | 18.1 | 4345 | 2020-05-23 03:41:02 | MASTER-IAC | (22h 33m 57.53s , +02d 08m 48.6s) | P- | 180 | 18.1 | 4484 | 2020-05-23 03:43:21 | MASTER-SAAO | (22h 37m 50.72s , +02d 05m 15.0s) | C | 180 | 18.8 | 4484 | 2020-05-23 03:43:21 | MASTER-SAAO | (22h 30m 45.82s , +02d 04m 07.5s) | C | 180 | 20.0 | 4586 | 2020-05-23 03:45:03 | MASTER-IAC | (22h 34m 45.48s , +02d 03m 47.0s) | P| | 180 | 18.3 | 4586 | 2020-05-23 03:45:03 | MASTER-IAC | (22h 34m 02.92s , +02d 07m 48.0s) | P- | 180 | 18.1 | 4683 | 2020-05-23 03:46:40 | MASTER-SAAO | (22h 37m 51.02s , +02d 06m 09.5s) | C | 180 | 18.7 | 4683 | 2020-05-23 03:46:40 | MASTER-SAAO | (22h 30m 46.05s , +02d 05m 02.0s) | C | 180 | 20.0 | 4826 | 2020-05-23 03:49:03 | MASTER-IAC | (22h 34m 40.49s , +02d 02m 45.8s) | P| | 180 | 18.2 | 4826 | 2020-05-23 03:49:03 | MASTER-IAC | (22h 33m 57.90s , +02d 06m 48.0s) | P- | 180 | 18.1 | 4823 | 2020-05-23 03:50:00 | MASTER-SAAO | (22h 43m 08.73s , +01d 56m 16.9s) | C | 60 | 17.8 | 4823 | 2020-05-23 03:50:00 | MASTER-SAAO | (22h 36m 03.78s , +01d 55m 09.7s) | C | 60 | 19.7 | 5004 | 2020-05-23 03:53:01 | MASTER-IAC | (22h 42m 44.24s , -00d 06m 17.0s) | C | 60 | 17.8 | 5004 | 2020-05-23 03:53:01 | MASTER-IAC | (22h 34m 38.99s , -00d 01m 40.6s) | C | 60 | 18.1 | 5120 | 2020-05-23 03:54:57 | MASTER-SAAO | (22h 27m 10.69s , +01d 54m 39.4s) | C | 60 | 16.6 | 5123 | 2020-05-23 03:55:00 | MASTER-IAC | (22h 46m 01.40s , +03d 54m 53.1s) | C | 60 | 18.0 | 5217 | 2020-05-23 03:56:34 | MASTER-IAC | (22h 29m 59.27s , +03d 53m 39.9s) | C | 60 | 17.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.