//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29012 SUBJECT: IceCube-201209A: IceCube observation of a high-energy neutrino candidate event DATE: 20/12/09 14:00:14 GMT FROM: Cristina Lagunas Gualda at DESY The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 20/12/09 at 10:15:43.94 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 0.77 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. Due to a technical problem, the initial automated alert was not issued. Nonetheless, sophisticated reconstruction algorithms have been applied offline, with a direction of: Date: 20/12/09 Time: 10:15:43.94 UT RA: 6.86 (+ 1.02 - 1.22 deg 90% PSF containment) J2000 Dec: -9.25 (+ 0.99 - 1.14 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-LAT 4FGL or 3FHL sources inside the 90% localization region. The closest source is 4FGL J0021.6-0855 located at RA 5.41 deg and Dec -8.92 deg (J2000), at a distance of 1.47 degrees from the best-fit location. 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: 29016 SUBJECT: IceCube-201209A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation DATE: 20/12/09 17:31:14 GMT FROM: Volodymyr Savchenko at ISDC,U of Geneve 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 combination of INTEGRAL all-sky detectors (following [1]): SPI/ACS, IBIS/Veto, and IBIS we have performed a search for a prompt gamma-ray counterpart of IceCube-201209A (GCN 29012). At the time of the event (2020-12-09 10:15:44 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 (17% of optimal) response of ISGRI, strongly suppressed (36% of optimal) response of IBIS/Veto, and near-optimal (89% of optimal) response of SPI-ACS. The background within +/-300 seconds around the event was very stable (excess variance 1.2). We have performed a search for any impulsive events in INTEGRAL SPI- ACS (as described in [2]), IBIS, and IBIS/Veto data. We do not detect any significant counterparts and estimate a 3-sigma upper limit on the 75-2000 keV fluence of 2e-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 ~1.7e-07 (5.9e-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: 1 possibly associated excess: T-T0 | scale | S/N | flux ( x 1e-06 erg/cm2/s) | FAP -0.0869 | 0.05 | 3.4 | 1.01 +/- 0.281 +/- 0.257 | 0.0103 5 likely background excesses: T-T0 | scale | S/N | flux ( x 1e-06 erg/cm2/s) | FAP 199 | 6.5 | 3.5 | 0.885 +/- 0.241 +/- 0.225 | 0.223 296 | 1.4 | 4.8 | 2.53 +/- 0.521 +/- 0.641 | 0.372 160 | 1.5 | 3.7 | 1.94 +/- 0.503 +/- 0.492 | 0.554 -3.94 | 0.05 | 3.3 | 0.979 +/- 0.28 +/- 0.249 | 0.627 39.1 | 0.55 | 3.4 | 2.93 +/- 0.833 +/- 0.744 | 0.63 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: 29022 SUBJECT: IceCube Alert 201209.43: Global MASTER-Net observations report DATE: 20/12/10 01:13:13 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), 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the IceCube Alert 201209.43 (trigger No 8912764,00h 25m 36.24s , -10d 01m 04.8s, R=0.59) errorbox 39512 sec after notice time and 52475 sec after trigger time at 2020-12-10 00:50:19 UT, with upper limit up to 18.8 mag. Observations started at twilight. The observations began at zenith distance = 25 deg. The sun altitude is -15.1 deg. The galactic latitude b = -72 deg., longitude l = 104 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1499288 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 52505 | 2020-12-10 00:50:19 | MASTER-OAFA | (00h 27m 05.58s , -10d 47m 41.9s) | C | 60 | 17.7 | 52585 | 2020-12-10 00:51:38 | MASTER-OAFA | (00h 26m 49.69s , -08d 47m 16.1s) | C | 60 | 18.2 | 52864 | 2020-12-10 00:56:17 | MASTER-OAFA | (00h 26m 59.38s , -10d 49m 18.5s) | C | 60 | 18.5 | 52943 | 2020-12-10 00:57:37 | MASTER-OAFA | (00h 35m 14.46s , -10d 49m 09.4s) | C | 60 | 18.8 | 53023 | 2020-12-10 00:58:57 | MASTER-OAFA | (00h 26m 53.61s , -08d 47m 24.0s) | C | 60 | 18.7 | 53297 | 2020-12-10 01:03:30 | MASTER-OAFA | (00h 35m 05.27s , -09d 23m 20.0s) | C | 60 | 18.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29023 SUBJECT: IceCube-201209A: No neutrino counterpart candidates in ANTARES search DATE: 20/12/10 10:46:53 GMT FROM: Antoine Kouchner at ANTARES Collaboration Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration. Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported single track-like event IceCube-201209A (GCN #29012 [https://gcn.gsfc.nasa.gov/gcn3/29012.gcn3]). The reconstructed origin was 34 degrees below the horizon for ANTARES. No up-going muon neutrino candidate events were recorded within 90% error box of the IceCube event during a +/- 1h time-window centered on the IceCube event time, and over which the potential source remained visible all time. This leads to a preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source of 16 GeV.cm^-2 over the energy range 3 TeV - 3 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and 30 GeV.cm^-2 (540 GeV - 275 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/- 1 day has also yielded no detection (55 % visibility). ANTARES [http://antares.in2p3.fr/] is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29024 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-201209A DATE: 20/12/10 16:45:47 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 IC201209A neutrino event (GCN 29012) 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 2020-12-09 at 10:15:43.94 UT (T0) with J2000 position RA = 6.86 (+1.02 ,-1.22) deg, Decl. = -9.25 (+0.99, -1.14) deg (90% PSF containment). No cataloged >100 MeV gamma-ray source is located within the 90% IC201209A localization region. 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 IC201209A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC201209A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.2e-10 ph cm^-2 s^-1 for ~12-years (2008-08-04 to 2020-12-09 UTC), and < 8.6e-9 (< 5.9e-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 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: 29025 SUBJECT: IceCube-201209A: Upper limits from Fermi-GBM Observations DATE: 20/12/10 21:51:40 GMT FROM: Cori Fletcher at USRA C. Fletcher (USRA) reports on behalf of the Fermi-GBM Team: For the IceCube high-energy neutrino candidate event 201209A (GCN 29012), at the event time Fermi-GBM was observing the reported neutrino location at: RA: 6.86 (+ 1.02 - 1.22 deg 90% PSF containment) J2000 Dec: -9.25 (+ 0.99 - 1.14 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-201209A. We set upper limits on impulsive gamma-ray emission. Using the representative soft, normal, and hard GRB-like templates (arXiv:1612.02395), we report the following 3 sigma flux upper limits over 10-1000 keV (in units of 10^-7 erg/s/cm^2): Timescale soft norm hard -------------------------------------- 0.128 s: 9.3 16. 25. 1.024 s: 3.2 5.1 7.9 8.192 s: 1.3 2.0 2.4 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29027 SUBJECT: IceCube-201209A: Upper limits from a search for additional neutrino events in IceCube DATE: 20/12/11 15:33:42 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-201209A (https://gcn.gsfc.nasa.gov/gcn3/29012.gcn3) in a time range of 2 days centered on the alert event time (2020-12-08 10:15:43.94 UTC to 2020-12-10 10:15:43.94 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-201209A. 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 = 8.8 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 5 TeV and 10 PeV. A subsequent search was performed to include the month of data prior to the alert event (2020-11-09 10:15:43.94 UTC to 2020-12-10 10:15:43.94 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 1.1 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: 29031 SUBJECT: IceCube-201209A: No Candidate Counterparts from the Zwicky Transient Facility DATE: 20/12/12 14:45:26 GMT FROM: Simeon Reusch at DESY Simeon Reusch (DESY), Sven Weimann (Ruhr University Bochum), Robert Stein (DESY) 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: We observed the localization region of the neutrino event IceCube-201209A (Lagunas Gualda et al., GCN 29012) 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-band and r-band beginning at 2020-12-10 03:11 UTC, approximately 16.9 hours after event time. We covered 3.2 sq deg, corresponding to 82.1% of the reported localization region. This estimate accounts for chip gaps. Each exposure was 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. 2020) 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). No counterpart candidates were detected. ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. 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 the AMPEL Follow-up Pipeline (Stein et al. 2020). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29042 SUBJECT: IceCube-201209: No significant detection in HAWC DATE: 20/12/14 19:19:05 GMT FROM: Mateo Fernandez at Pennsylvania State U Mateo Fernandez (Penn State University) reports on behalf of the HAWC collaboration (http://www.hawc-observatory.org/collaboration): On 20/12/09 10:15:43.94 UTC, the IceCube collaboration reported a track-like very-high-energy event that has a high probability of being an astrophysical neutrino, IceCube-201209A. Location is at RA: 6.86 (+ 1.02/-1.22 deg 90% PSF containment) J2000 Dec: -9.25 (+ 0.99/-1.14 deg 90% PSF containment) J2000 (GCN circular 29012). 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 June 2019. We searched inside the reported IceCube error region. The most significant location, with p-value 1.42e-04 (3.44e-03 post-trials), is at RA 6.11 deg, Dec -8.69 deg (±0.15 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 = 4.11003e-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 2020/12/08 03:58:58 UTC and ended 2020/12/10 04:14:55 UTC. The most significant location, with p-value 3.44e-02 (5.73e-01 post-trials), is at RA 7.6914 deg, Dec -9.25632 deg (±0.35 deg 68% containment) J2000. We set a time-integrated 95% CL upper limit at the position of maximum significance of: E^2 dN/dE = 2.54e-12 (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. ---------------------------------------------------------------------------------------------------------------------- Mateo Fernández Alonso Postdoctoral Scholar Pennsylvania State University Tel: +1 (814) 996-9015 Mail: mkf5479@psu.edu //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29049 SUBJECT: IceCube-201209A: Upper limits from Insight-HXMT/HE observations DATE: 20/12/15 14:39:56 GMT FROM: Y Q Zhang at IHEP C. Zheng, C. Cai, J. C. Liu, Q. Luo, S. Xiao, W. C. Xue, Q. B. Yi, Y. Q. Zhang, Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, X. Y. Song, 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=2020-12-09 10:15:43.94 UTC) of this high-energy neutrino event (GCN #29012), which was monitored by Insight-HXMT without any occultation by the Earth. There is no significant excess event (SNR > 3 sigma) found in the search of the Insight-HXMT/HE raw light curve (within T0 +/- 100 s). 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: 2.1e-07 erg cm^-2 10s: 6.7-07 erg cm^-2 Band model 2 (alpha=-1.0, beta=-2.3, Ep=230 keV): 1s: 3.4e-07 erg cm^-2 10s: 10.3e-07 erg cm^-2 Band model 3 (alpha=-0.0, beta=-1.5, Ep=1000 keV): 1s: 4.7e-07 erg cm^-2 10s: 18.4e-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 funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information could be found at: http://www.hxmt.org. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 29082 SUBJECT: IceCube-201209A : MAXI/GSC upper limit DATE: 20/12/18 04:29:17 GMT FROM: Motoko Serino at RIKEN/MAXI M. Serino (AGU), T. Mihara (RIKEN), H. Negoro, M. Nakajima, M. Aoki, K. Kobayashi, R. Takagi, K, Asakura, K, Seino (Nihon U.), T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Nishida, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, R. Adachi, M. Niwano (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, U. Goto, R. Uematsu (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) report on behalf of the MAXI team: We report the non-detection of MAXI/GSC of the neutrino event IceCube-201209A (GCN #29012). At 10:39:17 UT on 2020-12-09 (about 23.6 min after the event trigger), MAXI/GSC scanned the error region of the event at (R.A., Dec) = (6.8600, -9.2500) (J2000) with a radius of 65.40 arcmin. No significant excess emission was detected from the region. A typical 1-sigma averaged upper limit in one scan observation is 20 mCrab at 2-20 keV.