//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32276 SUBJECT: IceCube Alert 220627.74: Global MASTER-Net observations report DATE: 22/06/27 18:13:20 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, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.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) 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) was pointed to the IceCube Alert 220627.74 (trigger No 22443736,11h 01m 41.52s , +05d 00m 00.0s, R=0.51) errorbox 47 sec after notice time and 88 sec after trigger time at 2022-06-27 17:53:22 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 53 deg. The sun altitude is -26.7 deg. The galactic latitude b = 56 deg., longitude l = 249 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2016799 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 98 | 2022-06-27 17:53:22 | MASTER-SAAO | (11h 00m 26.09s , +05d 08m 58.7s) | C | 20 | 18.8 | 123 | 2022-06-27 17:53:22 | MASTER-SAAO | (11h 00m 26.09s , +05d 08m 58.7s) | C | 70 | 19.4 | Coadd 138 | 2022-06-27 17:54:01 | MASTER-SAAO | (11h 00m 32.45s , +05d 07m 59.8s) | C | 20 | 18.7 | 182 | 2022-06-27 17:54:41 | MASTER-SAAO | (11h 00m 27.24s , +05d 07m 01.7s) | C | 30 | 18.9 | 237 | 2022-06-27 17:55:31 | MASTER-SAAO | (11h 00m 32.82s , +05d 07m 05.1s) | C | 40 | 19.1 | 297 | 2022-06-27 17:55:31 | MASTER-SAAO | (11h 00m 32.82s , +05d 07m 05.0s) | C | 160 | 19.8 | Coadd 312 | 2022-06-27 17:56:40 | MASTER-SAAO | (11h 00m 29.29s , +05d 09m 05.6s) | C | 50 | 19.2 | 391 | 2022-06-27 17:57:50 | MASTER-SAAO | (11h 00m 29.00s , +05d 07m 38.4s) | C | 70 | 19.4 | 502 | 2022-06-27 17:59:31 | MASTER-SAAO | (11h 00m 31.52s , +05d 09m 10.1s) | C | 90 | 19.4 | 633 | 2022-06-27 18:01:32 | MASTER-SAAO | (11h 00m 25.31s , +05d 08m 18.2s) | C | 110 | 19.4 | 790 | 2022-06-27 18:03:54 | MASTER-SAAO | (11h 00m 24.43s , +05d 09m 23.7s) | C | 140 | 19.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32277 SUBJECT: IceCube-220627A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/06/27 19:06:39 GMT FROM: Marcos Santander at U. Alabama/IceCube The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 2022-06-27 at 17:51:54.28 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_BRONZE alert stream. The average astrophysical neutrino purity for Bronze alerts is 30%. This alert has an estimated false alarm rate of 3.454 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/136775_22443736.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2022-06-27 Time: 17:51:54.28 UT RA: 165.59 (+2.83, -5.61 deg 90% PSF containment) J2000 Dec: 5.30 (+1.76, -1.33 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 is one Fermi 4FGL catalog source in the 90% uncertainty region of the event: 4FGL J1050.1+0432 (RA: 162.55 deg, Dec: 4.54 deg J2000, 3.13 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: 32292 SUBJECT: IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/06/29 14:44:45 GMT FROM: Jessie Thwaites at IceCube/U Wisc-Madison 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-220627A (https://gcn.gsfc.nasa.gov/gcn3/32277.gcn3) in a time range of 1000 seconds centered on the alert event time (2022-06-27 17:43:34.270 UTC to 2022-06-27 18:00:14.270 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-220627A. 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-220627A ranges from 1.3e-01 to 1.4e-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 3e+02 GeV and 1e+05 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2022-06-26 17:51:54.270 UTC to 2022-06-28 17:51:54.270 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-220627A ranges from 1.5e-01 to 1.6e-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: 32298 SUBJECT: IceCube-220627A: No significant detection in HAWC DATE: 22/06/30 01:14:27 GMT FROM: Woo-Hyeon Heo at U of Seoul Woo-Hyeon Heo, Hugo Ayala (UOS, PSU) reports on behalf of the HAWC collaboration (http://www.hawc-observatory.org/collaboration): On 2022/06/27 17:51:54 UTC, the IceCube collaboration reported a track-like very-high-energy event that has a high probability of being an astrophysical neutrino, IceCube-220627A. Location is at RA: 165.59 (+2.83/-5.61 deg 90% PSF containment) J2000 Dec: 5.30 (+1.76/-1.33 deg 90% PSF containment) J2000 (GCN circular 32277). We performed two types of analyses for the follow-up. The first is for a steady source in archival data and the second is a search for a transient source. We assume a power-law spectrum with an index of -2.3 for both analyses. Search for a steady source in archival data: The archival data spans from November 2014 to June 2019. We searched inside the reported IceCube error region. The most significant location, with p-value 1.07e-03 (1.33e-01 post-trials), is at RA 163.96 deg, Dec +6.88 deg (±0.12 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit on gamma rays at the maximum position of: E^2 dN/dE = 2.94e-13 (E/TeV)^-0.3 TeV.cm^-2.s^-1 Search for a transient source. Since the event was not in our field of view at the time reported, we report the combined result for the transits before and after the IceCube event. Data acquisition started on 2022/06/27 01:53:17 UTC and ended 2022/06/28 04:44:51 UTC. The most significant location, with p-value 6.64e-04 (8.44e-02 post-trials), is at RA 162.20 deg, Dec +4.41 deg (±0.14 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit at the position of maximum significance of: E^2 dN/dE = 1.36e-11 (E/TeV)^-0.3 TeV.cm^-2.s^-1 HAWC is a very-high-energy gamma-ray observatory operating in Central Mexico at latitude 19 deg. north. Operating day and night with over 95% duty cycle, HAWC has an instantaneous field of view of 2 sr and surveys 2/3 of the sky every day. It is sensitive to gamma rays from 300 GeV to 100 TeV. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32301 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-220627A DATE: 22/06/30 11:26:24 GMT FROM: Simone Garrappa at DESY S. Garrappa (DESY-Zeuthen) and S. Buson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC220627A neutrino event (GCN 32277) 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 2022-06-27 at 17:51:54.28  UT (T0) with J2000 position RA = +165.59 (+2.83, -5.61) deg, Decl. = 5.30 (+1.76, -1.33) deg (90% PSF containment). Four cataloged gamma-ray (>100 MeV) sources are located within the 90% IC220627A localization region (4FGL-DR3; arXiv:2201.11184; The Fermi-LAT collaboration 2020, ApJS, 247, 33). Based on a preliminary analysis of the LAT data over the timescales of 1-month prior to T0, the only source significantly detected (> 5 sigma) is 4FGL J1040.5+0617, associated with the BL Lac object GB6 J1040+0617 at z = 0.74 (Paiano et al. 2021, MNRAS, 504, 3). This object has been previously suggested as candidate counterpart of the high-energy neutrino event IC141209A (Garrappa et al. 2019, ApJ 880, 2, 103). 4FGL J1040.5+0617 is detected over the timescale of 1-month prior to T0 at a flux level comparable to the average one reported in the 4FGL-DR3. We searched for intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC220627A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC220627A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 2.4e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04 to 2022-06-27 UTC), and < 4.6e-9 (< 4.8e-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 region 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.