//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33094 SUBJECT: IceCube-221223A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/12/23 15:59:58 GMT FROM: Marcos Santander at U. Alabama/IceCube The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 2022-12-23 at 07:43:00.52 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 0.246 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. The automated offline reconstruction pipeline that is used to generate refined directions encountered technical issues that require additional investigations to resolve. The event itself was examined using a graphical event display and is considered of good quality. At this time, the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/137467_64735045.amon) is the best information available: Date: 2022-12-23 Time: 07:43:00.52 UT RA: 350.54 +/- 0.67 deg (90% PSF containment) J2000 Dec: +34.71 +/- 0.67 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. We note that the error estimates from the initial automated alerts can underestimate the angular uncertainty after considering systematic errors and an additional update is planned once the more sophisticated algorithms in our standard pipeline are successfully applied. One gamma-ray source listed in the 4FGL Fermi-LAT catalog is located within the preliminary 90% uncertainty radius of the event. The source is 4FGL J2322.7+3436 / TXS 2320+343 (RA: 350.68 deg, Dec: 34.61 deg J2000, 0.15 deg away from the best-fit position) and is associated to a BL Lac object. 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: 33095 SUBJECT: IceCube Alert 221223.32: Global MASTER-Net observations report DATE: 22/12/23 17:00:15 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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the IceCube Alert 221223.32 (trigger No 64735045,23h 22m 11.76s , +34d 42m 39.6s, R=0.66) errorbox 32494 sec after notice time and 32547 sec after trigger time at 2022-12-23 16:45:27 UT, with upper limit up to 19.7 mag. The observations began at zenith distance = 28 deg. The sun altitude is -32.9 deg. The galactic latitude b = -25 deg., longitude l = 103 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2186667 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 32637 | 2022-12-23 16:45:27 | MASTER-Kislovodsk | (23h 22m 02.16s , +35d 10m 42.8s) | C | 180 | 19.7 | 32859 | 2022-12-23 16:49:09 | MASTER-Kislovodsk | (23h 22m 08.07s , +35d 09m 39.6s) | C | 180 | 19.7 | 33061 | 2022-12-23 16:52:31 | MASTER-Kislovodsk | (23h 17m 15.82s , +35d 06m 07.7s) | C | 180 | 19.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33100 SUBJECT: Fermi-LAT gamma-ray observations of IceCube-221223A DATE: 22/12/25 02:29:32 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 IC221223A high-energy neutrino event (GCN 33094) 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 2022-12-23 at 07:43:00.52 UT (T0) with J2000 position RA = 350.54 (+0.67, -0.67) deg, Decl. = +34.71 (+0.67, -0.67) deg (90% PSF containment). One cataloged gamma-ray (>100 MeV) source is located within the 90% IC221223A localization region. This is 4FGL J2322.7+3436 (4FGL-DR3; The Fermi-LAT collaboration 2022, ApJS, 260, 53), associated with the BL Lac object TXS 2320+343 (a.k.a. 5BZB J2322+3436, Massaro et al. 2015, Ap&SS, 357, 1). Based on a preliminary analysis of the LAT data over the timescales of 1-day and 1-month prior to T0, this object is not significantly detected (> 5 sigma). 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 IC221223A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC221223A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 2.1e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04 to 2022-12-23 UTC), and < 1e-8 (<2.7e-7) 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: 33101 SUBJECT: IceCube-221223A: BOOTES-4/MET Optical Observations DATE: 22/12/25 07:48:52 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: On 22-12-23 at 07:43:00.52 UT (T0) IceCube detected a track-like event with a high probability of being of astrophysical origin (GCN 33094). The gamma-ray source 4FGL J2322.7+3436 is located within the preliminary 90% uncertainty radius of the event (GCN 33094, 33100). We observed the gamma-ray source 4FGL J2322.7+3436 using BOOTES-4/MET 0.6m automatic optical telescope. During our observation period, this target is darker in optical SDSS-i band compared to result of SDSS DR16 (15.32 mag). From the 23rd to the 24th, the target has a small brightening. The magnitudes were calculated using four stars in the same frame and the SDSS DR16 catalogue as reference. The SDSS-i band magnitudes (without being corrected for Galactic extinction) are given as follows. MJD-T0 (day) | UT(start) | Magnitude (error) | Exposure Time ------------------------------------------------------------------------------ 0.394 | 22-12-23T17:10:40.800 | 15.565 (0.07) | 180s 0.397 | 22-12-23T17:14:47.990 | 15.585 (0.07) | 180s 0.4 | 22-12-23T17:18:58.982 | 15.545 (0.07) | 180s 0.403 | 22-12-23T17:23:11.962 | 15.565 (0.08) | 180s 0.406 | 22-12-23T17:27:18.979 | 15.455 (0.08) | 180s 1.263 | 22-12-24T14:01:26.026 | 15.401 (0.04) | 180s 1.267 | 22-12-24T14:06:55.037 | 15.427 (0.04) | 180s ------------------------------------------------------------------------------ There was no optical source within best-fit position of IceCube-221223A. The upper limit of magnitude (without being corrected for Galactic extinction) is 20.18 +/- 0.06 (clear filter, exposure of 30*60s, 22-12-23T11:19:55.746 UT). -------------------------------------------------------------------------------------------------------------- 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 fourth station of the BOOTE Network, BOOTES-4/MET, is located at the Lijiang Observatory of the Yunnan Observatories of China (Xiong et al. 2020). We acknowledge the support of these staffs from the BOOTES telescope networks. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33117 SUBJECT: IceCube-221223A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/12/28 20:32:18 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-221223A (https://gcn.gsfc.nasa.gov/gcn3/33094.gcn3) reported in the prompt GCN Notice in a time range of 1000 seconds centered on the alert event time (2022-12-23 07:34:40.523 UTC to 2022-12-23 07:51:20.523 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-221223A. The IceCube sensitivity to neutrino point sources with an E^-2.0 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-221223A is 4.3e-02 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.0 spectrum have energies in the approximate energy range between 7e+02 GeV and 3.5e+05 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2022-12-22 07:43:00.523 UTC to 2022-12-24 07:43:00.523 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^-2.0 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-221223A is 4.5e-02 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: 33134 SUBJECT: IceCube-221223A: No Candidate Counterparts from the Zwicky Transient Facility DATE: 23/01/01 14:05:53 GMT FROM: Simeon Reusch at DESY Simeon Reusch, Jannis Necker (DESY), Robert Stein (Caltech), Sven Weimann (Ruhr University Bochum) 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-221223A (Santander et. al, GCN 33094) 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 2022-12-24 02:35 UTC, approximately 18.9 hours after event time. We covered 76.2% (1.0 sq deg) of the reported localization region. This estimate accounts for chip gaps. First exposures were 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). We are left with the following high-significance transient candidates by our pipeline, all lying within the 90.0% localization of the skymap. No candidate counterparts were detected. 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 nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33152 SUBJECT: IceCube-221223A: JCMT/SCUBA2 observations DATE: 23/01/07 07:36:39 GMT FROM: Kuiyun Huang at CYCU Y. Urata and K. Huang, on behalf of a larger collaboration We observed the field of IceCube-221223A (GCN Circ. 33094) using Scuba-2 attached to JCMT. The observations were conducted on 2022/12/24 and 2022/12/29. SCUBA-2 imaged the field centered at RA 23:22:10, Dec +34:42:36 with 40 arcmin diameter. The rms of the stacked map in 850um created using two-night observations is 4.1 mJy. There was no source brighter than the 5-sigma limit.