//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32979 SUBJECT: IceCube Alert 221124.66: Global MASTER-Net observations report DATE: 22/11/24 16:13:21 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 221124.66 (trigger No 24212476,19h 55m 43.68s , +03d 28m 48.0s, R=0.9) errorbox 6 sec after notice time and 53 sec after trigger time at 2022-11-24 15:46:55 UT, with upper limit up to 15.8 mag. The observations began at zenith distance = 55 deg. The sun altitude is -22.7 deg. The galactic latitude b = -13 deg., longitude l = 44 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2165188 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 58 | 2022-11-24 15:46:55 | MASTER-Kislovodsk | (19h 56m 01.96s , +03d 32m 38.7s) | P- | 10 | 14.4 | 58 | 2022-11-24 15:46:55 | MASTER-Kislovodsk | (19h 56m 04.41s , +03d 55m 57.9s) | P| | 10 | 13.9 | 88 | 2022-11-24 15:47:25 | MASTER-Kislovodsk | (19h 56m 08.11s , +03d 31m 37.2s) | P- | 10 | 14.7 | 88 | 2022-11-24 15:47:25 | MASTER-Kislovodsk | (19h 56m 10.66s , +03d 54m 55.5s) | P| | 10 | 14.3 | 123 | 2022-11-24 15:47:55 | MASTER-Kislovodsk | (19h 56m 03.06s , +03d 30m 33.9s) | P- | 20 | 14.7 | 123 | 2022-11-24 15:47:55 | MASTER-Kislovodsk | (19h 56m 05.64s , +03d 53m 52.8s) | P| | 20 | 14.5 | 168 | 2022-11-24 15:48:35 | MASTER-Kislovodsk | (19h 56m 08.89s , +03d 30m 44.9s) | P- | 30 | 15.3 | 168 | 2022-11-24 15:48:35 | MASTER-Kislovodsk | (19h 56m 11.51s , +03d 54m 03.8s) | P| | 30 | 15.3 | 234 | 2022-11-24 15:49:35 | MASTER-Kislovodsk | (19h 56m 08.70s , +03d 55m 45.0s) | P| | 40 | 15.5 | 234 | 2022-11-24 15:49:35 | MASTER-Kislovodsk | (19h 56m 05.97s , +03d 32m 26.3s) | P- | 40 | 15.4 | 312 | 2022-11-24 15:50:44 | MASTER-Kislovodsk | (19h 56m 08.83s , +03d 53m 56.2s) | P| | 60 | 15.7 | 312 | 2022-11-24 15:50:44 | MASTER-Kislovodsk | (19h 56m 06.01s , +03d 30m 37.8s) | P- | 60 | 15.6 | 392 | 2022-11-24 15:50:44 | MASTER-Kislovodsk | (19h 56m 06.01s , +03d 30m 37.8s) | P- | 220 | 15.8 | Coadd 397 | 2022-11-24 15:52:04 | MASTER-Kislovodsk | (19h 56m 08.88s , +03d 32m 14.5s) | P- | 70 | 15.0 | 397 | 2022-11-24 15:52:04 | MASTER-Kislovodsk | (19h 56m 11.79s , +03d 55m 32.7s) | P| | 70 | 15.1 | 497 | 2022-11-24 15:53:34 | MASTER-Kislovodsk | (19h 56m 03.16s , +03d 31m 18.4s) | P- | 90 | 14.9 | 497 | 2022-11-24 15:53:34 | MASTER-Kislovodsk | (19h 56m 06.22s , +03d 54m 36.0s) | P| | 90 | 15.2 | 618 | 2022-11-24 15:55:24 | MASTER-Kislovodsk | (19h 56m 02.04s , +03d 32m 13.9s) | P- | 110 | 15.1 | 773 | 2022-11-24 15:55:24 | MASTER-Kislovodsk | (19h 56m 02.04s , +03d 32m 13.8s) | P- | 420 | 15.7 | Coadd 618 | 2022-11-24 15:55:25 | MASTER-Kislovodsk | (19h 56m 05.28s , +03d 55m 31.1s) | P| | 110 | 15.1 | 763 | 2022-11-24 15:57:35 | MASTER-Kislovodsk | (19h 56m 08.92s , +03d 31m 11.4s) | P- | 140 | 15.3 | 763 | 2022-11-24 15:57:35 | MASTER-Kislovodsk | (19h 56m 12.33s , +03d 54m 28.1s) | P| | 140 | 15.3 | 938 | 2022-11-24 16:00:15 | MASTER-Kislovodsk | (19h 56m 05.76s , +03d 53m 23.0s) | P| | 170 | 15.3 | 938 | 2022-11-24 16:00:15 | MASTER-Kislovodsk | (19h 56m 02.25s , +03d 30m 07.4s) | P- | 170 | 15.3 | 1134 | 2022-11-24 16:03:26 | MASTER-Kislovodsk | (19h 56m 08.50s , +03d 30m 26.8s) | P- | 180 | 15.4 | 1134 | 2022-11-24 16:03:26 | MASTER-Kislovodsk | (19h 56m 12.09s , +03d 53m 41.6s) | P| | 180 | 15.4 | The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 32980 SUBJECT: IceCube-221124A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/11/24 16:39:15 GMT FROM: Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 22-11-24 at 15:46:02.26 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 2.79 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/137296_24212476.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 22-11-24 Time: 15:46:02.26 RA: 298.92 (+2.65/-2.92 deg 90% PSF containment) J2000 Dec: +3.73 (+1.04/-1.23 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. One gamma-ray source listed in the 4FGL Fermi-LAT catalog is located in the 90% uncertainty contour. The source is 4FGL J1956.1+0234 located at RA=299.04 deg, Dec=2.57 deg (J2000 coordinates), 1.16 deg away from the best fit 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: 32983 SUBJECT: Fermi-LAT gamma-ray observations of IceCube-221124A DATE: 22/11/25 22:34:39 GMT FROM: Simone Garrappa at DESY J. Sinapius (DESY-Zeuthen), S. Garrappa (Ruhr-Universitaet Bochum) and S. Buson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the IC221124A high-energy neutrino event (GCN 32980) 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 2022-11-24 at 15:46:02 UT (T0) with J2000 position RA = 298.92 (+2.65, -2.92) deg, Decl. = +3.73 (+1.04, -1.23) deg (90% PSF containment). One cataloged gamma-ray (>100 MeV) source is located within the 90% IC221124A localization region (4FGL-DR3; The Fermi-LAT collaboration 2022, ApJS, 260, 53). This is 4FGL J1956.1+0234, associated with the blazar of uncertain type 2MASS J19562808+0234250. 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 IC221124A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC221124A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 7.5e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04 to 2022-11-24 UTC), and < 9.9e-9 (<4.7e-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 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: 32989 SUBJECT: IceCube-221124A: BOOTES-4/MET and BOOTES-2/TELMA optical upper limit DATE: 22/11/28 12:34:52 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, 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 2022-11-24 at 15:46:02.26 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin (GCN 32980). The gamma-ray source 4FGL J1956.1+0234 (RA=299.04 deg, Dec=2.57 deg, J2000) is located in the 90% uncertainty contour, and 1.16 deg away from the best fit position (GCN 32980, 32983).

We observed the gamma-ray source 4FGL J1956.1+0234 with BOOTES-4/MET and BOOTES-2/TELMA 0.6m automatic optical telescopes on Nov 25, 26, and 27. We did not detect any new optical source within localizationof the gamma ray source. The upper limits of magnitudes were calculated using six bright stars in the same frame and the APASS9 catalogue as reference. The upper limits of magnitudes (without being corrected for Galactic extinction) are given as follows.

MJD-T0 (day) | UT(Start) | Upper Limits (mag) | Exposure Time | Filter | Telescope

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0.86 | 2022-11-25T12:25:17.41 | 18.718 (0.04) | 11*30s | SDSS-i | BOOTES-4

0.87 | 2022-11-25T12:40:37.86 | 19.567 (0.07) | 8*30s | Clear | BOOTES-4

1.14 | 2022-11-25T19:04:23.56 | 18.756 (0.07) | 30*30s | SDSS-i | BOOTES-2

1.84 | 2022-11-26T11:52:03.53 | 19.347 (0.04) | 7*60s | SDSS-i | BOOTES-4

2.82 | 2022-11-27T11:29:08.99 | 19.80 (0.06) | 24*60s | SDSS-i | BOOTES-4

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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). 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: 32993 SUBJECT: IceCube-221124A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/11/28 20:32:57 GMT FROM: Sam Hori 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-221124A (https://gcn.gsfc.nasa.gov/gcn3/32980.gcn3) in a time range of 1000 seconds centered on the alert event time (2022-11-24 15:37:42.260 UTC to 2022-11-24 15:54:22.260 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-221124A. 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-221124A 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 (2022-11-23 15:46:02.260 UTC to 2022-11-25 15:46:02.260 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-221124A 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)