TITLE: GCN CIRCULAR NUMBER: 27533 SUBJECT: IceCube Alert 200410.97: Global MASTER-Net observations report DATE: 20/04/10 23:39:11 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-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) was pointed to the IceCube Alert 200410.97 (trigger No 24635982,16h 05m 03.84s , +11d 35m 06.0s, R=0.53) errorbox 20 sec after notice time and 73 sec after trigger time at 2020-04-10 23:21:08 UT, with upper limit up to 18.1 mag. The observations began at zenith distance = 33 deg. The sun altitude is -30.9 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the IceCube Alert 200410.97 errorbox 38 sec after notice time and 90 sec after trigger time at 2020-04-10 23:21:26 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 36 deg. The sun altitude is -33.2 deg. The galactic latitude b = 42 deg., longitude l = 24 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1334069 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 78 | 2020-04-10 23:21:08 | MASTER-Kislovodsk | (16h 04m 40.56s , +11d 21m 05.6s) | P| | 10 | 16.6 | 103 | 2020-04-10 23:21:08 | MASTER-Kislovodsk | (16h 04m 40.56s , +11d 21m 05.6s) | P| | 60 | 17.5 | Coadd 78 | 2020-04-10 23:21:08 | MASTER-Kislovodsk | (16h 04m 22.32s , +11d 48m 56.6s) | P- | 10 | 16.3 | 103 | 2020-04-10 23:21:08 | MASTER-Kislovodsk | (16h 04m 22.32s , +11d 48m 56.6s) | P- | 60 | 17.3 | Coadd 101 | 2020-04-10 23:21:26 | MASTER-Tavrida | (16h 09m 40.08s , +11d 33m 24.2s) | C | 20 | 16.4 | 126 | 2020-04-10 23:21:26 | MASTER-Tavrida | (16h 09m 40.07s , +11d 33m 24.2s) | C | 70 | 17.1 | Coadd 113 | 2020-04-10 23:21:38 | MASTER-Kislovodsk | (16h 04m 40.52s , +11d 19m 40.8s) | P| | 20 | 17.0 | 113 | 2020-04-10 23:21:38 | MASTER-Kislovodsk | (16h 04m 22.24s , +11d 47m 31.2s) | P- | 20 | 16.8 | 141 | 2020-04-10 23:22:06 | MASTER-Tavrida | (16h 09m 34.93s , +11d 32m 54.8s) | C | 20 | 15.3 | 159 | 2020-04-10 23:22:19 | MASTER-Kislovodsk | (16h 04m 42.29s , +11d 21m 08.3s) | P| | 30 | 17.0 | 159 | 2020-04-10 23:22:19 | MASTER-Kislovodsk | (16h 04m 23.95s , +11d 48m 57.5s) | P- | 30 | 16.9 | 186 | 2020-04-10 23:22:46 | MASTER-Tavrida | (16h 09m 34.90s , +11d 33m 55.3s) | C | 30 | 16.8 | 214 | 2020-04-10 23:23:09 | MASTER-Kislovodsk | (16h 04m 36.52s , +11d 20m 21.4s) | P| | 40 | 17.2 | 269 | 2020-04-10 23:23:09 | MASTER-Kislovodsk | (16h 04m 36.52s , +11d 20m 21.4s) | P| | 150 | 18.1 | Coadd 214 | 2020-04-10 23:23:09 | MASTER-Kislovodsk | (16h 04m 18.13s , +11d 48m 09.8s) | P- | 40 | 17.1 | 269 | 2020-04-10 23:23:09 | MASTER-Kislovodsk | (16h 04m 18.13s , +11d 48m 09.8s) | P- | 150 | 18.0 | Coadd 242 | 2020-04-10 23:23:37 | MASTER-Tavrida | (16h 09m 39.91s , +11d 32m 55.5s) | C | 40 | 17.0 | 307 | 2020-04-10 23:23:37 | MASTER-Tavrida | (16h 09m 39.91s , +11d 32m 55.6s) | C | 170 | 17.6 | Coadd 280 | 2020-04-10 23:24:10 | MASTER-Kislovodsk | (16h 04m 37.24s , +11d 21m 22.4s) | P| | 50 | 17.5 | 280 | 2020-04-10 23:24:10 | MASTER-Kislovodsk | (16h 04m 18.80s , +11d 49m 09.7s) | P- | 50 | 17.4 | 312 | 2020-04-10 23:24:37 | MASTER-Tavrida | (16h 09m 34.12s , +11d 31m 56.0s) | C | 60 | 17.0 | 355 | 2020-04-10 23:25:20 | MASTER-Kislovodsk | (16h 04m 42.28s , +11d 20m 23.6s) | P| | 60 | 17.5 | 355 | 2020-04-10 23:25:20 | MASTER-Kislovodsk | (16h 04m 23.79s , +11d 48m 10.0s) | P- | 60 | 17.4 | 398 | 2020-04-10 23:25:58 | MASTER-Tavrida | (16h 09m 40.59s , +11d 32m 04.0s) | C | 70 | 16.9 | 446 | 2020-04-10 23:26:41 | MASTER-Kislovodsk | (16h 04m 36.54s , +11d 19m 25.2s) | P| | 80 | 17.6 | 446 | 2020-04-10 23:26:41 | MASTER-Kislovodsk | (16h 04m 18.00s , +11d 47m 11.0s) | P- | 80 | 17.6 | 498 | 2020-04-10 23:27:28 | MASTER-Tavrida | (16h 09m 37.00s , +11d 33m 49.3s) | C | 90 | 17.2 | 556 | 2020-04-10 23:28:21 | MASTER-Kislovodsk | (16h 04m 42.32s , +11d 19m 45.7s) | P| | 100 | 17.8 | 556 | 2020-04-10 23:28:21 | MASTER-Kislovodsk | (16h 04m 23.72s , +11d 47m 31.0s) | P- | 100 | 17.6 | 619 | 2020-04-10 23:29:19 | MASTER-Tavrida | (16h 09m 36.98s , +11d 32m 26.3s) | C | 110 | 17.0 | 687 | 2020-04-10 23:30:22 | MASTER-Kislovodsk | (16h 04m 40.63s , +11d 21m 10.2s) | P| | 120 | 17.9 | 687 | 2020-04-10 23:30:22 | MASTER-Kislovodsk | (16h 04m 21.93s , +11d 48m 54.7s) | P- | 120 | 17.8 | 764 | 2020-04-10 23:31:29 | MASTER-Tavrida | (16h 09m 40.24s , +11d 33m 53.8s) | C | 140 | 16.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.