//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27941 SUBJECT: IceCube-200614A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 20/06/14 15:38:08 GMT FROM: Erik Blaufuss at U. Maryland/IceCube The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 20/06/14 at 12:41:21.41 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 threshold astrophysical neutrino purity for Bronze alerts is 30% . This alert has an estimated false alarm rate of 1.48 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/134187_72386329.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 20/06/14 Time: 12:41:21.41 UT RA: 33.84 (+4.77 -6.39 deg 90% PSF containment) J2000 Dec: 31.61( +2.75 -2.28 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 four Fermi-LAT 4FGL and 3FHL sources in the 90% containment region. The closest is 4FGL J0220.2+3246, 1.57 deg from the best fit location. Upon examination, this event appears to be a starting track event, where the neutrino interaction occurs inside the instrumented volume and the charge muon leaves the detector. Starting events tend to have poorer angular resolution than standard through-going events. 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: 27945 SUBJECT: IceCube Alert 200614.53: Global MASTER-Net observations report DATE: 20/06/14 17:39:06 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, D. Cheryasov (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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the IceCube Alert 200614.53 (trigger No 72386329,01h 54m 48.96s , +31d 11m 34.8s, R=1.19) errorbox 17264 sec after notice time and 17313 sec after trigger time at 2020-06-14 17:29:54 UT, with upper limit up to 13.4 mag. Observations started at twilight. The observations began at zenith distance = 82 deg. The sun altitude is -15.5 deg. The galactic latitude b = -29 deg., longitude l = 139 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1381607 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 17403 | 2020-06-14 17:29:54 | MASTER-Tunka | (01h 53m 43.45s , +30d 46m 34.1s) | C | 180 | 13.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27952 SUBJECT: IceCube-200614A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation DATE: 20/06/15 16:47:28 GMT FROM: Maeve Doyle at U College Dublin, Ireland M. Doyle, A. Martin-Carrillo (UCD, Ireland) 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-200614A (GCN 27941). At the time of the event (2020-06-14 12:41:21 UTC, hereafter T0), INTEGRAL was operating in nominal mode. The peak of the event localization probability was at an angle of 75 deg with respect to the spacecraft pointing axis. This orientation implies strongly suppressed (15% of optimal) response of ISGRI, strongly suppressed (32% of optimal) response of IBIS/Veto, and somewhat suppressed (64% of optimal) 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 2.7e-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 ~2.4e-07 (7.1e-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 region. We find 3 likely background excesses: T-T0 | scale | S/N | flux ( x 1e-06 erg/cm2/s) | FAP -89.2 | 4.5 | 3.6 | 1.5 +/- 0.491 +/- 0.667 | 0.116 89.4 | 2.55 | 4 | 2.2 +/- 0.653 +/- 0.979 | 0.119 85.4 | 0.25 | 4.1 | 0.77 +/- 0.21 +/- 0.342 | 0.975 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: 27955 SUBJECT: IceCube-200614A: not observable by Fermi-GBM DATE: 20/06/15 18:00:42 GMT FROM: Joshua Wood at MSFC/Fermi-GBM J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM Team: At the time of the neutrino candidate IceCube-200614A (GCN 27941), Fermi was passing through the South Atlantic Anomaly from 21 minutes prior to 4 minutes after the trigger time; therefore the GBM detectors were disabled. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27956 SUBJECT: IceCube-200614A: Upper limits from a search for additional neutrino events in IceCube DATE: 20/06/15 18:02:06 GMT FROM: Alex Pizzuto at ICECUBE/U of Wisconsin The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search for additional track-like muon neutrino events arriving from the direction of IceCube-200614A (https://gcn.gsfc.nasa.gov/gcn3/27941.gcn3) in a time range of 2 days centered on the alert event time (2020-06-13 12:41:21.410 UTC to 2020-06-15 12:41:21.410 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, one additional track-like event is found in spatial coincidence with the 90% containment region of IceCube-200614A. We find that these data are consistent with atmospheric background expectations, with a p-value of 1.0. We accordingly derive a time-integrated muon-neutrino flux upper limit at the alert position of E^2 dN/ dE = 5.2 x 10^-5 TeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum are approximately between 1 TeV and 500 TeV. A subsequent search was performed to include the month of data prior to the alert event (2020-05-15 12:41:21.410 UTC to 2020-06-15 12:41:21.410 UTC). In this case, we report a p-value of 1.0, consistent with no significant excess of track-like events, and a corresponding time-integrated muon-neutrino flux upper limit assuming an E^-2 spectrum (E^2 dN/dE) of 1.4 x 10^-4 TeV cm^-2 at the 90% CL. 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: 27966 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-200614A and detection of a new gamma-ray source, Fermi J0202.8+3132 DATE: 20/06/16 14:52:21 GMT FROM: Simone Garrappa at DESY S. Garrappa (DESY-Zeuthen) and S. Buson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC200614A neutrino event (GCN 27941) 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 2020-06-14 at 12:41:21.41 UT (T0) with J2000 position RA =33.84 (+4.77 -6.39) deg, Decl. =31.61(+2.75 -2.28) deg 90% PSF containment. Five cataloged >100 MeV gamma-ray sources (The Fermi-LAT Collaboration 2019, arXiv:1902.10045) are located within the 90% IC200614A localization error. These are  4FGL J0159.0+3313, 4FGL J0202.4+2943, 4FGL J0203.7+3042, 4FGL J0205.2+3212 and 4FGL J0220.2+3246. Based on a preliminary analysis of the LAT data over the timescales of 1-day and 1-month prior to T0, these objects are 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 IC200614A best-fit position. 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 < 8e-10 ph cm^-2 s^-1 for ~11-years (2008-08-04 / 2020-06-14 UTC), < 9e-9 (< 8e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Within the 90% confidence localization of the neutrino, ~2.7 deg offset from the best-fit IC200614A position, a >5 sigma excess of gamma rays, Fermi J0202.8+3132 was detected in an analysis of the integrated LAT data (> 100 MeV) between 2008-08-04 and  2020-06-14. Assuming a power-law spectrum, the best-fit localization is (J2000) RA:  30.71, Dec: 31.55 (0.16 deg 99% containment, 0.08 deg 68% containment), with best-fit spectral parameters flux = (5 +/- 3)e-10 ph cm^-2 s^-1 and index = 1.8 +/- 0.2. In a preliminary analysis of the LAT data over one day and one month prior T0, Fermi J0202.8+3132  is not significantly detected in the LAT data. A possible counterpart for Fermi J0202.8+3132 is the BL Lac candidate object NVSSJ020242+313212 (D'Abrusco et al. 2019, ApJS 242, 1), located 0.03 deg from the best-fit LAT localization. Two additional ~4 sigma excess of gamma rays are detected within the 90% confidence localization of IC200614A in an analysis of the LAT data (> 100 MeV) between 2008-08-04 and  2020-06-14. One is found at the best-fit localisation RA= 32.69, Dec= 30.97 (0.15 deg 99% containment), and has best-fit spectral parameters flux = (4 +/- 3)e-10 ph cm^-2 s^-1 and index = (1.8 +/- 0.2). The second one, at best-fit localisation RA= 35.91, Dec= 32.01 (0.2 deg 99% containment), has best-fit spectral parameters flux = (1.3 +/- 0.7)e-9 ph cm^-2 s^-1 and index = (2.2 +/- 0.2). These excesses are located ~1.2 deg and ~1.8 deg away from the best-fit IC200614A position, respectively. In a preliminary analysis of the LAT data over one day and one month prior to T0, they are not significantly detected in the LAT data. All values include the statistical uncertainty only. 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 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: 27969 SUBJECT: IceCube-200614A: No significant detection in HAWC DATE: 20/06/16 18:18:30 GMT FROM: Hugo Ayala at Pennsylvania State University Hugo Ayala (Penn State) reports on behalf of the HAWC collaboration (http://www.hawc-observatory.org/collaboration): On 2020/06/14 12:41:21 UTC, the IceCube collaboration reported a track-like very-high-energy event that has a high probability of being an astrophysical neutrino, IceCube-200614A. Location is at RA: 33.84 (+4.77/-6.39 deg 90% PSF containment) J2000 Dec: 31.61 (+2.75/-2.28 deg 90% PSF containment) J2000 (GCN circular 27941). 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. The most significant location, with p-value 3.02e-4 (8.27e-2 post-trials), is at RA 35.51 deg, Dec 33.55 deg (±0.16 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit on gamma rays at the maximum position of: E^2 dN/dE = 3.85e-13 (E/TeV)^-0.3 TeV.cm^-2.s^-1 Search for a transient source. Since the IceCube event fall inside the HAWC field of view, we report on the result for the transit of the IceCube position. Data acquisition started on 2020/06/13 18:10:07 UTC and ended 2020/06/14 18:32:13 UTC. The most significant location, with p-value 1.35e-3 (3.20e-1 post-trials), is at RA 38.63 deg, Dec -30.55 deg (±0.09 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit at the position of maximum significance of: E^2 dN/dE = 1.46e-11 (E/TeV)^-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.