//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32036 SUBJECT: IceCube Alert 220513.97: Global MASTER-Net observations report DATE: 22/05/13 23:39:13 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the IceCube Alert 220513.97 (trigger No 61640402,14h 52m 53.04s , -01d 13m 08.4s, R=0.51) errorbox 25 sec after notice time and 80 sec after trigger time at 2022-05-13 23:24:33 UT, with upper limit up to 15.7 mag. The observations began at zenith distance = 71 deg. The sun altitude is -20.6 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the IceCube Alert 220513.97 errorbox 26 sec after notice time and 81 sec after trigger time at 2022-05-13 23:24:34 UT, with upper limit up to 14.6 mag. The observations began at zenith distance = 54 deg. The sun altitude is -23.0 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the IceCube Alert 220513.97 errorbox 30 sec after notice time and 85 sec after trigger time at 2022-05-13 23:24:38 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 58 deg. The sun altitude is -20.9 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) was pointed to the IceCube Alert 220513.97 errorbox 30 sec after notice time and 85 sec after trigger time at 2022-05-13 23:24:38 UT, with upper limit up to 18.4 mag. The observations began at zenith distance = 36 deg. The sun altitude is -72.5 deg. The galactic latitude b = 49 deg., longitude l = 354 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1972449 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 91 | 2022-05-13 23:24:33 | MASTER-OAFA | (14h 51m 15.72s , -01d 48m 26.7s) | C | 20 | 15.2 | 92 | 2022-05-13 23:24:34 | MASTER-Tavrida | (14h 50m 52.41s , -01d 10m 38.6s) | P\ | 20 | 14.6 | 96 | 2022-05-13 23:24:38 | MASTER-Kislovodsk | (14h 53m 21.83s , -01d 07m 32.8s) | P- | 20 | 16.1 | 96 | 2022-05-13 23:24:38 | MASTER-Kislovodsk | (14h 53m 24.70s , -00d 43m 40.4s) | P| | 20 | 16.4 | 91 | 2022-05-13 23:24:38 | MASTER-SAAO | (14h 51m 55.50s , -01d 10m 04.1s) | C | 10 | 17.1 | 116 | 2022-05-13 23:24:38 | MASTER-SAAO | (14h 51m 55.49s , -01d 10m 04.1s) | C | 60 | 18.2 | Coadd 125 | 2022-05-13 23:25:07 | MASTER-SAAO | (14h 51m 59.52s , -01d 08m 54.8s) | C | 20 | 17.5 | 136 | 2022-05-13 23:25:18 | MASTER-Kislovodsk | (14h 53m 15.00s , -01d 08m 22.2s) | P- | 20 | 16.0 | 136 | 2022-05-13 23:25:18 | MASTER-Kislovodsk | (14h 53m 17.95s , -00d 44m 30.5s) | P| | 20 | 16.5 | 142 | 2022-05-13 23:25:24 | MASTER-OAFA | (14h 51m 11.62s , -01d 49m 26.5s) | C | 20 | 15.1 | 170 | 2022-05-13 23:25:47 | MASTER-SAAO | (14h 51m 51.71s , -01d 09m 27.7s) | C | 30 | 17.6 | 181 | 2022-05-13 23:25:59 | MASTER-Kislovodsk | (14h 53m 15.00s , -01d 07m 26.5s) | P- | 30 | 16.3 | 181 | 2022-05-13 23:25:59 | MASTER-Kislovodsk | (14h 53m 18.00s , -00d 43m 35.4s) | P| | 30 | 16.7 | 199 | 2022-05-13 23:26:16 | MASTER-OAFA | (14h 51m 17.54s , -01d 49m 04.6s) | C | 30 | 15.3 | 234 | 2022-05-13 23:26:46 | MASTER-SAAO | (14h 51m 53.60s , -01d 08m 24.3s) | C | 40 | 17.5 | 294 | 2022-05-13 23:26:46 | MASTER-SAAO | (14h 51m 53.64s , -01d 08m 24.2s) | C | 160 | 18.4 | Coadd 238 | 2022-05-13 23:26:50 | MASTER-Kislovodsk | (14h 53m 20.78s , -01d 08m 30.5s) | P- | 40 | 16.5 | 238 | 2022-05-13 23:26:50 | MASTER-Kislovodsk | (14h 53m 23.86s , -00d 44m 39.8s) | P| | 40 | 16.9 | 265 | 2022-05-13 23:27:17 | MASTER-OAFA | (14h 51m 14.14s , -01d 47m 39.2s) | C | 40 | 15.4 | 299 | 2022-05-13 23:27:46 | MASTER-SAAO | (14h 51m 59.09s , -01d 09m 21.1s) | C | 50 | 17.9 | 304 | 2022-05-13 23:27:51 | MASTER-Kislovodsk | (14h 53m 16.11s , -01d 09m 36.5s) | P- | 50 | 16.6 | 304 | 2022-05-13 23:27:51 | MASTER-Kislovodsk | (14h 53m 19.28s , -00d 45m 46.3s) | P| | 50 | 16.9 | 346 | 2022-05-13 23:28:29 | MASTER-OAFA | (14h 51m 14.37s , -01d 49m 22.4s) | C | 60 | 15.6 | 384 | 2022-05-13 23:29:01 | MASTER-Kislovodsk | (14h 53m 21.92s , -01d 09m 28.6s) | P- | 70 | 16.7 | 384 | 2022-05-13 23:29:01 | MASTER-Kislovodsk | (14h 53m 25.17s , -00d 45m 38.9s) | P| | 70 | 17.1 | 388 | 2022-05-13 23:29:05 | MASTER-SAAO | (14h 51m 53.54s , -01d 10m 16.8s) | C | 70 | 17.7 | 448 | 2022-05-13 23:30:00 | MASTER-OAFA | (14h 51m 17.46s , -01d 47m 38.7s) | C | 80 | 15.7 | 479 | 2022-05-13 23:30:31 | MASTER-Kislovodsk | (14h 53m 19.10s , -01d 08m 15.0s) | P- | 80 | 16.8 | 479 | 2022-05-13 23:30:31 | MASTER-Kislovodsk | (14h 53m 22.42s , -00d 44m 25.5s) | P| | 80 | 17.1 | 488 | 2022-05-13 23:30:35 | MASTER-SAAO | (14h 51m 59.26s , -01d 09m 45.5s) | C | 90 | 18.2 | 570 | 2022-05-13 23:31:52 | MASTER-OAFA | (14h 51m 12.15s , -01d 48m 24.0s) | C | 100 | 15.7 | 594 | 2022-05-13 23:32:11 | MASTER-Kislovodsk | (14h 53m 19.13s , -01d 09m 45.2s) | P- | 110 | 17.0 | 594 | 2022-05-13 23:32:11 | MASTER-Kislovodsk | (14h 53m 22.61s , -00d 45m 56.2s) | P| | 110 | 17.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32037 SUBJECT: IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/05/14 02:09:06 GMT FROM: Marcos Santander at U. Alabama/IceCube The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 2022-05-13 at 23:23:12.61 UT IceCube detected a track-like event with a moderate 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 0.942 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/136627_61640402.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2022-05-13 Time: 23:23:12.61 UT RA: 224.03 deg (+1.36, -1.27 deg 90% PSF containment) J2000 Dec: -1.34 deg (+0.74, -0.81 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 known gamma-ray sources in the 90% containment region for the event. The nearest source in the 4FGL-DR3 Fermi-LAT catalog is 4FGL J1445.0-0326 (221.27 deg, -3.45 deg J2000, 3.47 deg away from the best-fit neutrino candidate 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: 32040 SUBJECT: IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility DATE: 22/05/14 12:55:49 GMT FROM: Simeon Reusch at DESY Sven Weimann (Ruhr University Bochum), Simeon Reusch, Jannis Necker (DESY), Robert Stein (Caltech) and Anna Franckowiak (DESY/Ruhr University Bochum) report: On behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations: As part of the ZTF neutrino follow up program (Stein et al. 2022), we observed the localization region of the neutrino event IceCube-220513A (Santander et al, GCN 32037) with the Palomar 48-inch telescope, equipped with the 47 square degree ZTF camera (Bellm et al. 2019, Graham et al. 2019). We started observations in the g- and r-band beginning at 2022-05-14 07:28 UTC, approximately 8.1 hours after event time. We covered 51.3% (1.9 sq deg) of the reported localization region. This estimate accounts for chip gaps. Each exposure was 300s with a typical depth of 21.0 mag. The images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC to search for potential counterparts (Masci et al. 2019). AMPEL (Nordin et al. 2019, Stein et al. 2021) was used to search the alerts database for candidates. We reject stellar sources (Tachibana and Miller 2018) and moving objects, and apply machine learning algorithms (Mahabal et al. 2019). No candidate counterparts were detected. We will continue monitoring the localization region with ZTF in the g-band for the next days. ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019). Alert filtering is performed with the AMPEL Follow-up Pipeline (Stein et al. 2021). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32047 SUBJECT: [SUBJECT]: IceCube-220513A: No significant detection in HAWC DATE: 22/05/15 02:02:38 GMT FROM: Woo-Hyeon Heo at HAWC [SUBJECT]: IceCube-220513A: No significant detection in HAWC [FROM]: Woo-Hyeon Heo at the University of Seoul [BODY]: Woo-Hyeon Heo, Hugo Ayala (UOS, PSU) reports on behalf of the HAWC collaboration (http://www.hawc-observatory.org/collaboration): On 2022/05/13 23:23:13 UTC, the IceCube collaboration reported a track-like very-high-energy event that has a high probability of being an astrophysical neutrino, IceCube-220513A. Location is at RA: 224.03 (+1.36/-1.27 deg 90% PSF containment) J2000 Dec: -1.34 (+0.74/-0.81 deg 90% PSF containment) J2000 (GCN circular 32037). 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 1.66e-2 (0.54 post-trials), is at RA 225.22 deg, Dec -1.04 deg (±0.83 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 = 1.97e-13 (E/TeV)^-0.3 TeV.cm^-2.s^-1 Search for a transient source. Since the IceCube event fall inside the HAWC field of view, we report on the result for the current transit of the IceCube position. Data acquisition started on 2022/05/12 08:35:57 UTC and ended 2022/05/14 08:49:21 UTC. The most significant location, with p-value 2.22e-02 (3.73e-01 post-trials), is at RA 225.22 deg, Dec -0.97 deg (±0.89 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit at the position of maximum significance of: E^2 dN/dE = 1.38e-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: 32049 SUBJECT: IceCube-220513A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/05/15 17:53:25 GMT FROM: Abhishek Desai 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-220513A (https://gcn.gsfc.nasa.gov/gcn3/32037.gcn3) in a time range of 1000 seconds centered on the alert event time (2022-05-13 23:14:52.606 UTC to 2022-05-13 23:31:32.606 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-220513A. 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-220513A is 1.5e-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 2e+05 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2022-05-12 23:23:12.606 UTC to 2022-05-14 23:23:12.606 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-220513A is 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: 32050 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-220513A DATE: 22/05/15 20:46:33 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 IC220513A neutrino event (GCN 32037) 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 2022-05-13 at 23:23:12.61  UT (T0) with J2000 position RA = +224.03 (+1.36, -1.27) deg, Decl. = -1.34 (+0.74, -0.81) deg (90% PSF containment). No cataloged gamma-ray (>100 MeV) sources are located within the 90% IC220513A localization region (4FGL-DR3; arXiv:2201.11184; The Fermi-LAT collaboration 2020, ApJS, 247, 33). 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 IC220513A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC220513A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 4.6e-10 ph cm^-2 s^-1 for ~13-years (2008-08-04 to 2022-05-13 UTC), and < 2.1e-8 (< 6.2e-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.