//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26339 SUBJECT: IceCube-191204A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation DATE: 19/12/04 23:45:16 GMT FROM: Diego Gotz at CEA Diego Gotz (AIM CEA Saclay, France), Enrico Bozzo, V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland) J. Rodi (IAPS-Roma, Italy), A. Coleiro (APC, France), S. Mereghetti (INAF IASF-Milano, Italy) on behalf of the INTEGRAL multi-messenger collaboration: https://www.astro.unige.ch/cdci/integral-multimessenger-collaboration Using INTEGRAL/SPI-ACS realtime data (following [1]) we have performed a search for a prompt gamma-ray counterpart of IceCube-191204A. At the time of the event (2019-12-04 22:46:11 UTC, hereafter T0), INTEGRAL was operating in nominal mode. The peak of the event localization probability was at an angle of 79 deg with respect to the spacecraft pointing axis. This orientation implies strongly suppressed (4.7% of optimal) response of ISGRI, strongly suppressed (8.2% of optimal) response of IBIS/Veto, and somewhat suppressed (65%! of op timal) response of SPI-ACS. The background within +/-300 seconds around the event was very stable (excess variance 1.1). We have performed a search for any impulsive events in INTEGRAL SPI- ACS (as described in [2]) data. We do not detect any significant counterparts and estimate a 3-sigma upper limit on the 75-2000 keV fluence of 2.6e-07 erg/cm^2 (within the 50% probability containment region of the source localization) for a burst lasting less than 1 s with a characteristic short GRB spectrum (an exponentially cut off power law with alpha=-0.5 and Ep=600 keV) occurring at any time in the interval within 300 s around T0. For a typical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and Ep=300 keV), the derived peak flux upper limit is ~2.1e-07 (7e-08) erg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range. We report for completeness and in order of FAP, all excesses identified in the search reg! ion. We find: 7 likely background excesses: scale | T | S/N | flux ( x 1e-06 erg/cm2/s) | FAP 0.9 | -31.8 | 3.9 | 3.64 +/- 0.889 +/- 0.953 | 0.129 2.4 | -41.2 | 3.2 | 1.82 +/- 0.542 +/- 0.476 | 0.236 0.35 | -21.2 | 3.8 | 0.567 +/- 0.143 +/- 0.148 | 0.251 0.05 | 71.1 | 7 | 2.85 +/- 0.393 +/- 0.747 | 0.44 1.5 | -51.6 | 3.1 | 2.3 +/- 0.687 +/- 0.603 | 0.562 0.75 | 139 | 3.7 | 3.85 +/- 0.974 +/- 1.01 | 0.853 0.6 | 217 | 4.2 | 0.472 +/- 0.109 +/- 0.123 | 0.918 Note that FAP estimates (especially at timescales above 2s) may be possibly further affected by enhanced non-stationary local background noise. This list excludes any excesses for which FAP is close to unity. All results quoted are preliminary. This circular is an official product of the INTEGRAL Multi-Messenger team. [1] Savchenko et al. 2017, A&A 603, A46 [2] Savchenko et al. 2012, A&A 541A, 122S //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26341 SUBJECT: IceCube-191204A - IceCube observation of a high-energy neutrino candidate event DATE: 19/12/05 00:39:59 GMT FROM: Robert Stein at DESY The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 19/12/04 at 22:46:11.32 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 3.21 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/133394_27261780.amon ), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 19/12/04 Time: 22:46:11.32 UT RA: 79.72 (+3.20 -1.74 deg 90% PSF containment) J2000 Dec: 2.80 (+1.12 -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. There are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J0521.6+0103 at RA: 80.41 deg, Dec: 1.05 deg (1.88 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: 26343 SUBJECT: IceCube Alert 191204.95: Global MASTER-Net observations report DATE: 19/12/05 05:39:11 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (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 191204.95 (05h 17m 36.07s , +02d 50m 30.5s, R=0.5134) errorbox 56 sec after trigger time at 2019-12-04 22:47:08 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 43 deg. The sun altitude is -59.8 deg. The galactic latitude b = -19 deg., longitude l = 199 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1216565 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 147 | 2019-12-04 22:47:08 | MASTER-Kislovodsk | (05h 17m 47.15s , +02d 55m 16.0s) | C | 180 | 18.5 | 147 | 2019-12-04 22:47:08 | MASTER-Kislovodsk | (05h 17m 43.90s , +03d 21m 40.6s) | C | 180 | 18.2 | 347 | 2019-12-04 22:50:28 | MASTER-Kislovodsk | (05h 17m 50.39s , +02d 55m 57.0s) | C | 180 | 19.0 | 347 | 2019-12-04 22:50:28 | MASTER-Kislovodsk | (05h 17m 46.87s , +03d 22m 18.8s) | C | 180 | 18.8 | 548 | 2019-12-04 22:53:49 | MASTER-Kislovodsk | (05h 17m 44.68s , +02d 54m 55.6s) | C | 180 | 19.3 | 548 | 2019-12-04 22:53:49 | MASTER-Kislovodsk | (05h 17m 40.95s , +03d 21m 15.4s) | C | 180 | 19.1 | 749 | 2019-12-04 22:57:10 | MASTER-Kislovodsk | (05h 17m 44.86s , +02d 55m 50.6s) | C | 180 | 19.4 | 749 | 2019-12-04 22:57:10 | MASTER-Kislovodsk | (05h 17m 41.02s , +03d 22m 09.3s) | C | 180 | 19.1 | 949 | 2019-12-04 23:00:30 | MASTER-Kislovodsk | (05h 17m 49.94s , +02d 54m 46.8s) | C | 180 | 19.4 | 949 | 2019-12-04 23:00:30 | MASTER-Kislovodsk | (05h 17m 46.15s , +03d 21m 04.6s) | C | 180 | 19.3 | 1552 | 2019-12-04 23:10:33 | MASTER-Kislovodsk | (05h 17m 48.10s , +02d 55m 24.9s) | C | 180 | 19.4 | 1552 | 2019-12-04 23:10:33 | MASTER-Kislovodsk | (05h 17m 44.61s , +03d 21m 39.9s) | C | 180 | 19.2 | 1753 | 2019-12-04 23:13:53 | MASTER-Kislovodsk | (05h 17m 44.76s , +03d 19m 55.4s) | C | 180 | 19.1 | 3775 | 2019-12-04 23:47:36 | MASTER-Kislovodsk | (05h 17m 48.01s , +02d 54m 36.3s) | C | 180 | 18.4 | 3775 | 2019-12-04 23:47:36 | MASTER-Kislovodsk | (05h 17m 48.63s , +03d 21m 07.4s) | C | 180 | 17.8 | 3976 | 2019-12-04 23:50:57 | MASTER-Kislovodsk | (05h 17m 45.20s , +02d 55m 22.0s) | C | 180 | 18.9 | 3976 | 2019-12-04 23:50:57 | MASTER-Kislovodsk | (05h 17m 45.90s , +03d 21m 49.7s) | C | 180 | 18.2 | 4177 | 2019-12-04 23:54:18 | MASTER-Kislovodsk | (05h 17m 50.38s , +02d 54m 13.6s) | C | 180 | 19.2 | 4177 | 2019-12-04 23:54:18 | MASTER-Kislovodsk | (05h 17m 51.20s , +03d 20m 38.7s) | C | 180 | 18.4 | 4378 | 2019-12-04 23:57:39 | MASTER-Kislovodsk | (05h 17m 44.63s , +02d 53m 07.7s) | C | 180 | 19.2 | 4378 | 2019-12-04 23:57:39 | MASTER-Kislovodsk | (05h 17m 45.47s , +03d 19m 31.6s) | C | 180 | 18.5 | 16817 | 2019-12-05 03:24:58 | MASTER-Kislovodsk | (05h 19m 04.63s , +02d 45m 41.5s) | C | 180 | 14.2 | 16817 | 2019-12-05 03:24:58 | MASTER-Kislovodsk | (05h 19m 23.40s , +03d 12m 28.9s) | C | 180 | 13.9 | 17018 | 2019-12-05 03:28:18 | MASTER-Kislovodsk | (05h 18m 59.28s , +02d 46m 13.8s) | C | 180 | 13.4 | 17018 | 2019-12-05 03:28:18 | MASTER-Kislovodsk | (05h 19m 19.48s , +03d 13m 12.6s) | C | 180 | 13.0 | 17219 | 2019-12-05 03:31:39 | MASTER-Kislovodsk | (05h 19m 26.83s , +03d 11m 59.5s) | C | 180 | 12.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26345 SUBJECT: IceCube-191204A: Upper limits from Fermi-GBM Observations DATE: 19/12/05 16:51:29 GMT FROM: C. Michelle Hui at MSFC/Fermi-GBM C. M. Hui (MSFC) and P. Veres (UAH) report on behalf of the Fermi-GBM team: For the IceCube high-energy neutrino candidate event 191204A (GCN 26341), at the event time Fermi-GBM was observing the reported neutrino location at: RA: 79.72 (+3.20 -1.74 deg 90% PSF containment) J2000 Dec: 2.80 (+1.12 -1.23 deg 90% PSF containment) J2000 There was no Fermi-GBM onboard trigger around the event time of the neutrino candidate. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around the neutrino candidate time. From this search, no significant signal was found related to IceCube-191204A. We set upper limits on impulsive gamma-ray emission. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV (in units of 10^-7 erg/s/cm^2): Timescale Soft Normal Hard ------------------------------------------- 0.128 s: 15 20 37 1.024 s: 3.4 4.4 12 8.192 s: 1.3 2.3 3.6 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 26367 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-191204A DATE: 19/12/06 22:26:23 GMT FROM: Sara Buson at GSFC/Fermi S. Buson (Univ. of Wuerzburg) and S. Garrappa (DESY-Zeuthen) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC191204A neutrino event (GCN 26341) 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 2019-12-04 at 22:46:11.32 UT (T0) with J2000 position RA = 79.72 (+3.20, -1.74) deg, Decl. = 2.80(+1.12, -1.23) deg 90% PSF containment. No cataloged gamma-ray sources are found within the 90% IC191204A localization error. We searched for the existence of intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (>5sigma) new excess emission (>100 MeV) within the IC191204A 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IceCube best-fit position, the >100 MeV flux upper limit (95% confidence) is < 2.6e-10 ph cm^-2 s^-1 for ~11-years (2008-08-04 / 2019-12-04 UT), < 8e-9 (< 5e-9) 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 this source the Fermi-LAT contact person are S. Buson (sara.buson at uni-wuerzburg.de) and S. Garrappa (simone.garrappa at desy.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: 26369 SUBJECT: IceCube-191204A: No significant detection in HAWC DATE: 19/12/06 23:17:21 GMT FROM: Hugo Ayala at Pennsylvania State University Hugo Ayala (PSU) reports on behalf of the HAWC collaboration (http://www.hawc-observatory.org/collaboration): On 2019/12/04 22:46:11.32 UTC, the IceCube collaboration reported a track-like very-high-energy event that has a high probability of being an astrophysical neutrino, IceCube-191204A. Location is at RA: 79.72 (+3.20/-1.74 90% PSF containment) J2000 Dec: 2.80(+1.12/-1.23 deg 90% PSF containment) J2000 https://gcn.gsfc.nasa.gov/gcn3/26341.gcn3 (GCN circular 26341). 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 May 2018. We searched inside the reported IceCube error region from the circular. The highest significance, 2.93 sigma (1.28 post-trials), is at RA 82.57 deg, Dec 2.99 deg J2000. We set a time-integrated 95% CL upper limit on gamma rays at the maximum position of: E^2 dN/dE < 3.414e-13 (E/TeV)^-0.3 TeV cm^-2 s^-1 Search for a transient source. Since the event was not in our field of view at the time reported, we report the combined result for the transits before and after the IceCube event. Data acquisition started on Data Start: 2019/12/03 09:40:53 UTC and ended 2019/12/04 09:53:59 UTC. The most significant location, with 3.27 sigma (1.86 post-trials), is at RA 80.99 deg, Dec 3.49 deg (J2000). We set a time-integrated 95% CL upper limit at the position of maximum significance of: E^2 dN/dE < 1.235e-11 (E/1TeV)^-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: 26374 SUBJECT: IceCube-191204A : Upper limits from Insight-HXMT/HE observations DATE: 19/12/07 02:02:10 GMT FROM: YaoGuang Zheng at IHEP Y. G. Zheng, C. Cai, Q. Luo, S. Xiao, Q. B. Yi, Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team: Insight-HXMT was taking data normally around the trigger time (T0=2019-12-04 22:46:11.32 UTC) of this high-energy neutrino event (GCN #26341), which was monitored without any occultation by the Earth. Within T0 +/- 100 s, no significant excess events (SNR > 3 sigma) are found in a search of the Insight-HXMT/HE raw light curves. Assuming the counterpart GRB with three typical GRB Band spectral models, two typical duration timescales(1 s, 10 s) coming from the position of this neutrino event, the 5-sigma upper-limits fluence (0.2 - 5 MeV, incident energy) are reported below: Band model 1 (alpha=-1.9, beta=-3.7, Ep=70 keV): 1s: 9.1e-07 erg cm^-2 10s: 1.5e-06 erg cm^-2 Band model 2 (alpha=-1.0, beta=-2.3, Ep=230 keV): 1s: 1.1e-06 erg cm^-2 10s: 1.8e-06 erg cm^-2 Band model 3 (alpha=-0.0, beta=-1.5, Ep=1000 keV): 1s: 1.0e-06 erg cm^-2 10s: 2.8e-06 erg cm^-2 Further analysis will be reported in the following circulars. All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (record energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope. Insight-HXMT is the first Chinese space X-ray telescope, which was fundedjointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information could be found at: http://www.hxmt.org.