//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33039 SUBJECT: IceCube Alert 221210.36: Global MASTER-Net observations report DATE: 22/12/10 09:13:08 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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the IceCube Alert 221210.36 (trigger No 7930341,22h 08m 22.08s , +23d 50m 27.6s, R=1.13) errorbox 17 sec after notice time and 69 sec after trigger time at 2022-12-10 08:36:20 UT, with upper limit up to 18.1 mag. Observations started at twilight. The observations began at zenith distance = 26 deg. The sun altitude is -10.2 deg. The galactic latitude b = -26 deg., longitude l = 82 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2180073 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 74 | 2022-12-10 08:36:20 | MASTER-Amur | (22h 12m 30.63s , +23d 51m 03.3s) | C | 10 | 15.5 | 109 | 2022-12-10 08:36:50 | MASTER-Amur | (22h 12m 36.73s , +23d 50m 01.8s) | C | 20 | 15.9 | 154 | 2022-12-10 08:37:29 | MASTER-Amur | (22h 12m 30.57s , +23d 49m 00.5s) | C | 30 | 16.3 | 208 | 2022-12-10 08:38:19 | MASTER-Amur | (22h 12m 35.66s , +23d 49m 25.3s) | C | 40 | 16.5 | 273 | 2022-12-10 08:39:18 | MASTER-Amur | (22h 12m 33.58s , +23d 50m 41.5s) | C | 50 | 16.6 | 347 | 2022-12-10 08:40:28 | MASTER-Amur | (22h 12m 33.58s , +23d 49m 20.6s) | C | 60 | 16.9 | 437 | 2022-12-10 08:41:48 | MASTER-Amur | (22h 12m 35.79s , +23d 50m 34.2s) | C | 80 | 17.0 | 546 | 2022-12-10 08:43:27 | MASTER-Amur | (22h 12m 29.68s , +23d 50m 00.5s) | C | 100 | 17.3 | 676 | 2022-12-10 08:45:26 | MASTER-Amur | (22h 12m 29.78s , +23d 51m 02.0s) | C | 120 | 17.5 | 830 | 2022-12-10 08:47:46 | MASTER-Amur | (22h 12m 36.96s , +23d 50m 00.2s) | C | 150 | 17.6 | 1015 | 2022-12-10 08:50:36 | MASTER-Amur | (22h 12m 29.74s , +23d 49m 00.9s) | C | 180 | 17.8 | 1215 | 2022-12-10 08:53:55 | MASTER-Amur | (22h 12m 35.93s , +23d 49m 26.4s) | C | 180 | 17.9 | 1414 | 2022-12-10 08:57:15 | MASTER-Amur | (22h 12m 33.88s , +23d 50m 47.8s) | C | 180 | 18.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33040 SUBJECT: IceCube-221210A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 22/12/10 12:24:04 GMT FROM: Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 22-12-10 at 08:35:11.23 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 0.9539 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/137350_7930341.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 22-12-10 Time: 08:35:11.23 RA: 332.58 (+9.84/-11.77 deg 90% PSF containment) J2000 Dec: +22.75 (+8.15/-4.13 deg 90% PSF containment) J2000 Due to the event being a short through-going track, the 90% uncertainty contour is especially large. We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino. Two gamma-ray sources listed in the 4FGL Fermi-LAT catalog are located within 2 deg of the best-fit candidate neutrino position. The sources are 4FGL J2207.1+2222 and 4FGL J2212.0+2356, and are located 0.82 and 1.25 deg away from the best-fit position, respectively. A total of 20 sources listed in the 4FGL catalog are within the 90% containment radius of the event. 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: 33048 SUBJECT: IceCube-221210A: Upper limits from a search for additional neutrino events in IceCube DATE: 22/12/12 16:04:38 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-221210A (https://gcn.gsfc.nasa.gov/gcn3/33040.gcn3) in a time range of 1000 seconds centered on the alert event time (2022-12-10 08:26:51.230 UTC to 2022-12-10 08:43:31.230 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-221210A. 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-221210A 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 2e+02 GeV and 9e+04 GeV. A subsequent search was performed including 2 days of data centered on the alert event time (2022-12-09 08:35:11.230 UTC to 2022-12-11 08:35:11.230 UTC). In this case, we report a p-value of 0.65, 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-221210A ranges from 1.6e-01 to 1.7e-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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33075 SUBJECT: Fermi-LAT gamma-ray observations of IceCube-221210A DATE: 22/12/16 23:09:54 GMT FROM: Simone Garrappa at DESY J. Sinapius (DESY-Zeuthen), S. Buson (Univ. of Wuerzburg) and S. Garrappa (Ruhr Universitaet Bochum) on behalf of the Fermi-LAT collaboration: We report an analysis of observations in the vicinity of the high-energy IC221210A neutrino event (GCN 33040) 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 2022-12-10 at 08:35:11.23 UT (T0) with J2000 position RA = 332.58 (+9.84, -11.77) deg, Decl. = +22.75 (+8.15, -4.13) deg (90% PSF containment). Due to the large uncertainty on the neutrino localization, several  cataloged gamma-ray (>100 MeV) sources are located within the 90% IC221210A 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 IC221210A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC221210A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.5e-10 ph cm^-2 s^-1 for ~13-years (2008-08-04 to 2022-12-10 UTC), and < 6.6e-9 (< 1.7e-7) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. The catalogued source 4FGL J2212.0+2356, associated with the flat-spectrum radio quasar PKS 2209+236, is located 1.25 deg from the best-fit neutrino position. An inspection of the Fermi-LAT data over the 14 years of LAT observations, shows that on timescales of 1-month, the object is a relatively stable and faint gamma-ray emitter. Integrating over a time interval of 1-month prior to T0, the source is significantly detected (> 5 sigma). A preliminary analysis of the data over the past year, indicates that the source is undergoing enhanced activity. It is currently in a fading phase of a flaring episode that started circa September 2022. The peak-activity flux of F = (1.4 +/- 0.2)e-7 ph cm^-2 s^-1, about 10 times the average 4FGL value, is observed between October and November 2022 (see also FAVA light curve https://fermi.gsfc.nasa.gov/ssc/data/access/lat/FAVA/LightCurve.php?ra=333.02&dec=23.93). Three additional sources are significantly detected (> 5 sigma) over a time interval of 1-month prior to T0, with fluxes comparable to their average 4FGL value. 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 J. Sinapius (jonas.sinapius at desy.de), 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33084 SUBJECT: IceCube-221210A: BOOTES-4/MET and Lijiang 2.4-meter Telescopes Optical Observations DATE: 22/12/19 15:43:34 GMT FROM: Dingrong Xiong at Yunnan Observatories of CAS, China D. R. Xiong, J. M. Bai, Y. F. Fan, H. C. Feng, 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 BOOTESteam and Lijiang 2.4-meter team report: On 22-12-10 at 08:35:11.23 UT (T0) IceCube detected a track-like event with a moderate probability of being of astrophysical origin (GCN 33040). The two gamma-ray sources 4FGL J2207.1+2222 (blazar candidate) and 4FGL J2212.0+2356 (flat-spectrum radio quasar) in 4FGL-DR3, closest from best-fit position, are located in the 90% uncertainty contour, and are located 0.82 and 1.25 deg away from the best-fit position, respectively (GCN 33040; GCN 33075). We observed the gamma-ray source 4FGL J2207.1+2222 using BOOTES-4/MET 0.6m automatic optical telescope on 22-12-12 at 13:03:03.88 UT. There was no optical source within localizationof the gamma ray source. The upper limit of AB magnitude (without being corrected for Galactic extinction) is 17.72 +/- 0.01 (clear filter, exposure of 17*60s). The gamma-ray source 4FGL J2212.0+2356 was observed using BOOTES-4/MET 0.6m automatic optical telescope and Lijiang 2.4-meter optical telescope. After correcting flat field and bias, we used PyRAF to implement aperture photometry. The magnitudes were calculated using four stars in the same frame and the SDSS DR16 catalogue as reference. The magnitudes (without being corrected for Galactic extinction) are given as follows. MJD-T0 (day) | UT(Start) | Magnitudes (mag) | Exposure Time | Filter | Telescope -------------------------------------------------------------------------------------------------------------- 1.117 | 22-12-11T11:23:20.72 | 18.003 (0.06) | 400s | SDSS-i | Lijiang 2.4-meter 1.152| 22-12-11T12:13:49.41 | 18.35 (0.09) | 3*180s | Clear | BOOTES-4 2.130| 22-12-12T11:42:05.74 | 18.681 (0.082) | 30*60s | Clear | BOOTES-4 -------------------------------------------------------------------------------------------------------------- The above magnitude values are smaller than that in DR16 (SDSS-i: 19.3 mag), i.e., during our observation period, this target becomes brighter in optical band. 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 Lijiang 2.4-meter Telescope (LJT), the largest common-purpose optical telescope in China. It is located at the Gaomeigu site, Lijiang Observatory, in the southwest of China (Wang et al. 2019). We acknowledge the support of these staffs from the BOOTES telescope networks and Lijiang 2.4-meter telescope.