//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33122 SUBJECT: IceCube-221229A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/12/29 15:01:36 GMT FROM: Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 2022-12-29 at 07:25:27.88 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 1.014 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/137487_35344578.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2022-12-29 Time: 07:25:27.88 UT RA: 31.90 (+1.68/-1.55 deg 90% PSF containment) J2000 Dec: +4.18 (+1.39/-0.84 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 of the event. The nearest gamma-ray source in either catalog is 4FGL J0215.9+0521 (TXS 0213+051) at RA: 33.99 deg, Dec: 5.35 deg J2000 (2.39 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: 33124 SUBJECT: IceCube-221229A: BOOTES-2/TELMA Optical Upper Limit DATE: 22/12/30 15:32:21 GMT FROM: Dingrong Xiong at Yunnan Observatories of CAS, China D. R. Xiong, J. M. Bai, Y. F. Fan, K. Ye, C. J. Wang, Y. X. Xin, B. L. Lun, J. R. Mao, X. H. Zhao, L. Xu, X. G. Yu, K. X. Lu, X. Ding, D. Q. Wang (Yunnan Observatories), A. J. Castro-Tirado, E. Fernandez-Garcia, Y. D. Hu (IAA-CSIC) and C. J. Perez del Pulgar (UMA) on behalf of the BOOTES team report: On 2022-12-29 at 07:25:27.88 UT IceCube detected a track-like event with a high probability of being of astrophysical origin (GCN 33122). We observed the best-fit position of IceCube-221229A with BOOTES-2/TELMA 0.6m automatic optical telescope. The magnitude was calculated using three bright stars in the same frame and the SDSS DR16 catalogue as reference. We did not detect any optical source within the best-fit position. The upper limit of magnitude (without being corrected for Galactic extinction) is given as follows. Tmid-T0 (day) | UT (start) | Upper Limit (error) | Exposure Time | Filter | Comment -------------------------------------------------------------------------------------------------------------- 0.61 | 22-12-29T22:05:40.929 | 19.22 (0.11) | 5*300s (co-added) | Clear | Strong moonlight --------------------------------------------------------------------------------------------------------------- The Burst Optical Observer and Transient Exploring System (BOOTES) is a world-wide automatic telescope network which aims to repaid follow-up of transient and astrophysical sources in the sky for which the first station was installed in 1998 (Hu et al. 2021). The BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain). We acknowledge the support of these staffs from the BOOTES telescope networks. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33126 SUBJECT: Fermi-LAT gamma-ray observations of IceCube-221229A DATE: 22/12/30 18:52:23 GMT FROM: Simone Garrappa at DESY S. Garrappa (Ruhr-Universitaet Bochum), 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 IC221229A high-energy neutrino event (GCN 33122) 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 2022-12-29 at 07:25:27.88 UT (T0) with J2000 position RA = 31.90 (+1.68, -1.55) deg, Decl. = +4.18 (+1.39, -0.84) deg (90% PSF containment). No cataloged gamma-ray sources (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) are located within the 90% IC221229A localization region. 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 IC221229A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC221229A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.3e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04 to 2022-12-29 UTC), and < 1.2e-8 (<8.8e-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 ruhr-uni-bochum.de), J. Sinapius (jonas.sinapius 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33127 SUBJECT: IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/12/30 21:11:57 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-221229A (https://gcn.gsfc.nasa.gov/gcn3/33122.gcn3) in a time range of 1000 seconds centered on the alert event time (2022-12-29 07:17:07.884 UTC to 2022-12-29 07:33:47.884 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-221229A. 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-221229A is 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 (2022-12-28 07:25:27.884 UTC to 2022-12-30 07:25:27.884 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-221229A 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: 33128 SUBJECT: Subject: IceCube-Cascade 221229A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/12/31 05:05:07 GMT FROM: Abhishek Desai at ICECUBE/U of Wisconsin The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search [1] for track-like muon neutrino events arriving from the direction of IceCube-Cascade 221229A (https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/137489_30229466.amon) in a time range of 1000 seconds centered on the alert event time (2022-12-29 22:48:52.768 UTC to 2022-12-29 23:05:32.768 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-Cascade 221229A. 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-Cascade 221229A ranges from 1.4e-01 to 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 2e+02 GeV and 7e+04 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2022-12-28 22:57:12.768 UTC to 2022-12-30 22:57:12.768 UTC). In this case, we report a p-value of 0.24, 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-Cascade 221229A ranges from 1.6e-01 to 1.8e-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: 33166 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-Cascade-221229A DATE: 23/01/14 01:12:48 GMT FROM: Simone Garrappa at DESY J. Sinapius (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg), S. Garrappa (Ruhr-Universitaet Bochum) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the IceCube-Cascade-221229A high-energy neutrino event (https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/137489_30229466.amon) 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 2022-12-29 at 22:57:12.76 UT (T0) with J2000 position RA = (27.24 +/- 6.01) deg, Decl. = (36.80 +/- 6.01) deg (90% PSF containment). Multiple cataloged gamma-ray (>100 MeV) sources are located within the 90% IceCube-Cascade-221229A localization region (4FGL-DR3; The Fermi-LAT collaboration 2022, ApJS, 260, 53). Based on a preliminary analysis of the LAT data over the timescales of 1-day and 1-month prior to T0, one of these objects is significantly detected (> 5 sigma). This source is the BL Lac object 4FGL J0136.5+3906, associated with the TeV emitter TeV J0136+391, at 3.35 deg from the IC best-fit position. In a preliminary analysis of LAT data over 30 days before T0, the object is observed at a flux level of (9.75 +/- 4.48) e-9 ph cm^-2 s^-1, consistent with the average value reported in 4FGL-DR3. We searched for intermediate (days to months) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IceCube-Cascade-221229A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IceCube-Cascade-221229A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 7.2e-9 (< 5.2e-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 J. Sinapius (jonas.sinapius at desy.de), S. Garrappa (simone.garrappa at ruhr-uni-bochum.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.