//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31615 SUBJECT: AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-220220A DATE: 22/02/20 14:59:43 GMT FROM: Hugo Ayala at Pennsylvania State University The AMON, IceCube, and HAWC collaborations report: The AMON NuEm stream channel found a coincidence alert from the IceCube online neutrino selection + HAWC daily monitoring analysis. The analysis looks for IceCube neutrino events -mostly atmospheric in origin- around the position and transit time of a HAWC cluster of likely gamma rays, as identified in the integrated observations from a single transit, in this case having a duration of 5.66 hours. The HAWC transit interval start from 2022/02/20 08:08:05 UT - 2022/02/20 14:19:37 UT (End of HAWC Transit Time) The location of the coincidence is reported as RA (J2000): 221.35 deg Dec (J2000): 13.23 deg Location uncertainty (50% containment): 0.17 deg (statistical only). Location uncertainty (90% containment): 0.31 deg (statistical only). The false alarm rate (FAR) of this coincidence is 1.25 per year. We encourage follow-up observations of the alert region contingent on the availability of resources and interest, given the quoted FAR. AMON seeks to perform a real-time correlation analysis of the high-energy signals across all known astronomical messengers. More information about AMON can be found in https://www.amon.psu.edu/ Information on the IceCube collaboration: http://icecube.wisc.edu/ Information on the HAWC collaboration: https://www.hawc-observatory.org //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31616 SUBJECT: IceCube Alert 220220.60: Global MASTER-Net observations report DATE: 22/02/20 21:29:17 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez, M.L.H.Rodriguez (INAOE, OAGH) A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the IceCube Alert 220220.60 (trigger No 220220,14h 45m 23.98s , +13d 13m 48.0s, R=0.17) errorbox 25 sec after notice time and 618 sec after trigger time at 2022-02-20 14:29:55 UT, with upper limit up to 16.6 mag. The observations began at zenith distance = 77 deg. The sun altitude is -48.0 deg. The galactic latitude b = 59 deg., longitude l = 11 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1889478 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 678 | 2022-02-20 14:29:55 | MASTER-Amur | (14h 42m 51.44s , +13d 34m 16.1s) | P\ | 120 | 13.3 | 833 | 2022-02-20 14:32:14 | MASTER-Amur | (14h 42m 51.57s , +13d 32m 31.1s) | P\ | 150 | 13.0 | 1018 | 2022-02-20 14:35:04 | MASTER-Amur | (14h 42m 54.86s , +13d 33m 58.4s) | P\ | 180 | 13.4 | 1217 | 2022-02-20 14:38:24 | MASTER-Amur | (14h 42m 48.84s , +13d 33m 15.2s) | P\ | 180 | 13.0 | 1416 | 2022-02-20 14:41:43 | MASTER-Amur | (14h 42m 49.03s , +13d 34m 12.8s) | P\ | 180 | 13.5 | 1616 | 2022-02-20 14:45:03 | MASTER-Amur | (14h 42m 55.32s , +13d 33m 09.4s) | P\ | 180 | 13.4 | 5624 | 2022-02-20 15:52:50 | MASTER-Amur | (14h 42m 58.57s , +13d 29m 12.0s) | R | 60 | 15.5 | 5704 | 2022-02-20 15:54:10 | MASTER-Amur | (14h 42m 52.54s , +13d 28m 09.8s) | R | 60 | 15.7 | 5783 | 2022-02-20 15:55:30 | MASTER-Amur | (14h 42m 59.85s , +13d 28m 16.4s) | R | 60 | 15.6 | 5863 | 2022-02-20 15:56:49 | MASTER-Amur | (14h 42m 56.65s , +13d 29m 49.2s) | R | 60 | 15.7 | 5942 | 2022-02-20 15:58:09 | MASTER-Amur | (14h 42m 56.76s , +13d 28m 28.4s) | R | 60 | 15.6 | 6022 | 2022-02-20 15:59:28 | MASTER-Amur | (14h 43m 00.05s , +13d 30m 01.7s) | R | 60 | 15.7 | 6102 | 2022-02-20 16:00:48 | MASTER-Amur | (14h 42m 52.91s , +13d 29m 01.5s) | R | 60 | 15.8 | 6181 | 2022-02-20 16:02:08 | MASTER-Amur | (14h 42m 53.02s , +13d 30m 01.1s) | R | 60 | 15.7 | 6261 | 2022-02-20 16:03:28 | MASTER-Amur | (14h 43m 00.34s , +13d 29m 00.3s) | R | 60 | 15.8 | 6341 | 2022-02-20 16:04:48 | MASTER-Amur | (14h 42m 54.36s , +13d 27m 60.0s) | R | 60 | 15.9 | 6421 | 2022-02-20 16:06:08 | MASTER-Amur | (14h 42m 59.44s , +13d 28m 06.4s) | R | 60 | 15.8 | 6501 | 2022-02-20 16:07:27 | MASTER-Amur | (14h 42m 57.33s , +13d 29m 31.0s) | R | 60 | 15.9 | 10155 | 2022-02-20 17:07:21 | MASTER-Amur | (14h 43m 03.36s , +13d 28m 31.0s) | R | 180 | 16.1 | 10354 | 2022-02-20 17:10:41 | MASTER-Amur | (14h 42m 57.44s , +13d 27m 51.8s) | R | 180 | 16.1 | 10554 | 2022-02-20 17:14:00 | MASTER-Amur | (14h 42m 57.58s , +13d 28m 50.2s) | R | 180 | 16.1 | 10753 | 2022-02-20 17:17:20 | MASTER-Amur | (14h 43m 04.93s , +13d 27m 48.2s) | R | 180 | 16.1 | 10953 | 2022-02-20 17:20:40 | MASTER-Amur | (14h 42m 57.96s , +13d 26m 47.7s) | R | 180 | 16.1 | 11153 | 2022-02-20 17:24:00 | MASTER-Amur | (14h 43m 05.28s , +13d 27m 05.1s) | R | 180 | 16.1 | 12996 | 2022-02-20 17:54:43 | MASTER-Amur | (14h 43m 08.31s , +13d 28m 58.9s) | R | 180 | 15.5 | 13423 | 2022-02-20 18:01:49 | MASTER-Amur | (14h 43m 02.64s , +13d 28m 10.2s) | R | 180 | 15.9 | 13622 | 2022-02-20 18:05:09 | MASTER-Amur | (14h 43m 03.81s , +13d 29m 02.7s) | R | 180 | 16.1 | 13822 | 2022-02-20 18:08:28 | MASTER-Amur | (14h 43m 10.03s , +13d 28m 00.1s) | R | 180 | 16.1 | 14022 | 2022-02-20 18:11:48 | MASTER-Amur | (14h 43m 02.98s , +13d 26m 57.6s) | R | 180 | 16.1 | 14221 | 2022-02-20 18:15:08 | MASTER-Amur | (14h 43m 09.27s , +13d 27m 15.0s) | R | 180 | 16.2 | 14652 | 2022-02-20 18:22:19 | MASTER-Amur | (14h 43m 07.64s , +13d 27m 06.3s) | R | 180 | 15.6 | 14852 | 2022-02-20 18:25:38 | MASTER-Amur | (14h 43m 11.03s , +13d 28m 47.3s) | R | 180 | 15.9 | 15051 | 2022-02-20 18:28:58 | MASTER-Amur | (14h 43m 03.91s , +13d 27m 55.6s) | R | 180 | 16.1 | 15251 | 2022-02-20 18:32:18 | MASTER-Amur | (14h 43m 03.99s , +13d 28m 52.0s) | R | 180 | 16.1 | 15451 | 2022-02-20 18:35:37 | MASTER-Amur | (14h 43m 11.31s , +13d 27m 52.0s) | R | 180 | 16.2 | 15650 | 2022-02-20 18:38:57 | MASTER-Amur | (14h 43m 05.30s , +13d 26m 50.6s) | R | 180 | 16.3 | 17556 | 2022-02-20 19:11:42 | MASTER-Amur | (14h 43m 05.21s , +13d 29m 20.2s) | C | 60 | 16.0 | 17636 | 2022-02-20 19:13:02 | MASTER-Amur | (14h 43m 10.31s , +13d 28m 15.8s) | C | 60 | 15.7 | 17716 | 2022-02-20 19:14:23 | MASTER-Amur | (14h 43m 05.24s , +13d 27m 12.4s) | C | 60 | 16.1 | 17776 | 2022-02-20 19:14:23 | MASTER-Amur | (14h 43m 05.24s , +13d 27m 12.4s) | C | 180 | 16.6 | Coadd 17796 | 2022-02-20 19:15:43 | MASTER-Amur | (14h 43m 11.35s , +13d 27m 24.3s) | C | 60 | 16.3 | 17876 | 2022-02-20 19:17:02 | MASTER-Amur | (14h 43m 08.51s , +13d 29m 08.6s) | C | 60 | 16.2 | 17955 | 2022-02-20 19:18:22 | MASTER-Amur | (14h 43m 08.56s , +13d 27m 39.1s) | C | 60 | 16.2 | 18095 | 2022-02-20 19:19:42 | MASTER-Amur | (14h 43m 11.46s , +13d 28m 52.5s) | C | 180 | 16.6 | 18295 | 2022-02-20 19:23:02 | MASTER-Amur | (14h 43m 04.72s , +13d 28m 07.3s) | C | 180 | 16.6 | 18495 | 2022-02-20 19:26:21 | MASTER-Amur | (14h 43m 04.75s , +13d 29m 06.9s) | C | 180 | 16.4 | 18695 | 2022-02-20 19:29:41 | MASTER-Amur | (14h 43m 11.67s , +13d 28m 07.7s) | C | 180 | 16.3 | 18894 | 2022-02-20 19:33:01 | MASTER-Amur | (14h 43m 04.89s , +13d 27m 09.0s) | C | 180 | 16.3 | 19100 | 2022-02-20 19:36:26 | MASTER-Amur | (14h 43m 11.80s , +13d 27m 39.3s) | C | 180 | 16.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31620 SUBJECT: IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart DATE: 22/02/21 10:09:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs O.Gress & N.M. Budnev (Irkutsk State University, API), V. Lipunov, N.Tiurina, K.Zhirkov, A.Kuznetsov, P.Balanutsa, A.Chasovnikov, K.Zhirkov, N.Tiurina, G.Antipov, E.Gorbovskoy, D. Vlasenko, V.Senik, Ya.Kechin, V.Topolev (Lomonosov MSU,SAI,PhysicsDepartment), A. Gabovich & V.Yurkov (Blagoveschensk Educational StateUniversity) L. Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J. Martinez, A.R.Corella, L.H.Rodriguez (INAOE, OAGH), C.Francile, R. Podesta, F. Podesta (OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), MASTER Global Robotic Net (Lipunov et al. 2010, Advances in Astronomy, v.2010, 30L) started IceCube 20220220.60/AMON NuEm-220220A alert (GCN #31615, https://gcn.gsfc.nasa.gov/other/icecube_220220A.gcn3 ) optical observations 25 sec after notice time (618s after trigger time) at 2022-02-20 14:29:55 UT at MASTER-Amur (Lipunov et al. GCN #31616) and observed it in MASTER-OAGH (Mexico), -SAAO (South Africa), -OAFA (Argentina), see cover map https://master.sai.msu.ru/site/master2/event.php?id=1889478
There is a blazar 5BZBJ1442+1200 (RA=220.70117d DEC=12.01119d) 1.5 degrees from the center of the event that shows moderate dimming that started 10 days before the neutrino according to public ATLAS data (https://fallingstar-data.com/forcedphot/queue/169872/plot.pdf).
There was IC-201014A in this region (IC GCN #28624, MASTER GCN #28627 ). Due to this dimming we are inclined to believe that 5BZBJ1442+1200 might be a source of NuEM-220220A even though it is largely outside the error-box. The analysis will be continued. Additional observations are planned.