//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31542 SUBJECT: IceCube Alert 220202.49: Global MASTER-Net observations report DATE: 22/02/02 12:26:08 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 220202.49 (trigger No 22093816,01h 30m 27.12s , -03d 43m 19.2s, R=0.51) errorbox 114 sec after notice time and 168 sec after trigger time at 2022-02-02 11:51:26 UT, with upper limit up to 13.9 mag. The observations began at zenith distance = 72 deg. The sun altitude is -33.1 deg. The galactic latitude b = -64 deg., longitude l = 147 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1867985 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 183 | 2022-02-02 11:51:26 | MASTER-Amur | (01h 31m 11.30s , -04d 03m 49.9s) | P\ | 30 | 13.1 | 238 | 2022-02-02 11:52:16 | MASTER-Amur | (01h 31m 05.66s , -04d 04m 54.3s) | P\ | 40 | 13.1 | 382 | 2022-02-02 11:54:25 | MASTER-Amur | (01h 31m 09.68s , -04d 03m 28.5s) | P\ | 70 | 12.4 | 481 | 2022-02-02 11:55:54 | MASTER-Amur | (01h 31m 09.70s , -04d 05m 10.1s) | P\ | 90 | 13.3 | 601 | 2022-02-02 11:57:44 | MASTER-Amur | (01h 31m 12.52s , -04d 03m 10.6s) | P\ | 110 | 13.3 | 741 | 2022-02-02 11:59:54 | MASTER-Amur | (01h 31m 05.75s , -04d 04m 07.8s) | P\ | 130 | 13.8 | 905 | 2022-02-02 12:02:23 | MASTER-Amur | (01h 31m 07.17s , -04d 03m 07.5s) | P\ | 160 | 13.9 | 1094 | 2022-02-02 12:05:22 | MASTER-Amur | (01h 31m 13.34s , -04d 04m 08.0s) | P\ | 180 | 13.9 | 1294 | 2022-02-02 12:08:42 | MASTER-Amur | (01h 31m 06.52s , -04d 05m 05.1s) | P\ | 180 | 13.9 | 1494 | 2022-02-02 12:12:02 | MASTER-Amur | (01h 31m 13.73s , -04d 04m 41.5s) | P\ | 180 | 13.8 | 1693 | 2022-02-02 12:15:21 | MASTER-Amur | (01h 31m 10.91s , -04d 03m 10.5s) | P\ | 180 | 13.9 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31543 SUBJECT: IceCube-220202A: IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/02/02 14:19:28 GMT FROM: Cristina Lagunas Gualda at DESY The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 2022-02-02 at 11:48:38.59 UT IceCube detected a track-like event with a high probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Gold alert stream. The average astrophysical neutrino purity for Gold alerts is 50%. This alert has an estimated false alarm rate of 1.925 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/136241_22093816.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2022-02-02 Time: 11:48:38.59 UTC RA: 21.36 (+1.10, -0.77 deg 90% PSF containment) J2000 Dec: -3.88 (+0.42, -0.64 deg 90% PSF containment) J2000 We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino. There are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J0124.8-0625 at RA: 21.22 deg, Dec: -6.43 deg (2.56 deg away from the best-fit event position). The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31545 SUBJECT: IceCube-220202A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/02/03 17:10:03 GMT FROM: Alex Pizzuto at ICECUBE/U of Wisconsin The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-220202A (https://gcn.gsfc.nasa.gov/gcn3/31543.gcn3) in a time range of 1000 seconds centered on the alert event time (2022-02-02 11:40:18.590 UTC to 2022-02-02 11:56:58.590 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-220202A. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-220202A ranges from 2.4e-01 to 3.3e-01 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 4e+02 GeV and 2e+05 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2022-02-01 11:48:38.590 UTC to 2022-02-03 11:48:38.590 UTC). In this case, we report a p-value of 1.00, consistent with no significant excess of track events. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-220202A ranges from 2.5e-01 to 3.4e-01 GeV cm^-2 in a 2 day time window. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu. [1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 31546 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-220202A DATE: 22/02/03 20:09:52 GMT FROM: Simone Garrappa at DESY S. Garrappa (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg) and J. Sinapius (DESY-Zeuthen) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC220202A neutrino event (GCN 31543) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2022-02-02 11:48:38.59 UTC (T0) with J2000 position RA = 21.36 (+1.10, -0.77) deg, Decl. = -3.88 (+0.42, -0.64) deg 90% PSF containment. No cataloged gamma-ray sources are found within the 90% IC220202A localization error (The Fourth Fermi-LAT catalog DR3; The Fermi-LAT collaboration 2022, arXiv:2201.11184). We searched for the existence of intermediate (months to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (>5sigma) new excess emission (> 100 MeV) at the the IC220202A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC220202A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 2.4-10 ph cm^-2 s^-1 for ~13-years (2008-08-04 / 2022-02-02 UTC), < 3.7e-9 (< 5.7e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For these observations the Fermi-LAT contact persons are S. Garrappa (simone.garrappa at desy.de) and S. Buson (sara.buson at uni-wuerzburg.de). The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.