{
  "bibcode": "2020GCN.26674....1N",
  "body": "++++++++++++++++++++++++++++++++++++++++++++++++++++++++\nANTARES 200108A: AMON + ANTARES Identification of a High-Energy Neutrino +\nFermi LAT Coincidence\n\n\nC. F. Turley and D. B. Fox (for AMON https://www.amon.psu.edu/) +\nM. Ageron (CNRS/CPPM) A.Coleiro (Univ. de Paris/APC), D. Dornic\n(CNRS/CPPM), A. Kouchner (Univ. de Paris/APC ) (for ANTARES) report:\n\n\"During operations of the AMON ANTARES neutrino + Fermi LAT gamma-ray\nmultimessenger alerts, at 2020 January 8 at 09:30:14 UT, we identified\na low false alarm-rate (2.39 per year) coincidence between a single\nANTARES neutrino and one Fermi LAT photon. An alert was automatically\ngenerated and, after human review, distributed to AMON partner\nfacilities at 2020 January 8, 15:04 UT. We are now reporting this\nalert publicly. Alert details are as follows:\n\n    Date:  8 January 2020\n    Time:  09:30:14.48 UT\n    R.A.:  02:53:55.6 (J2000)\n    Dec.: -18:04:02 (J2000)\n    r_90:  0.832 deg (90%-containment)\n    FAR:   2.387 yr-1\n\nANTARES 200108A is a high-energy neutrino-induced muon event detected\nby ANTARES (Ageron et al. 2011) with coordinates R.A. 02:53:47.8,\nDec. -18:07:23 (J2000) at 09:25:12 UT, and a p-value based on the\nnumber of hits used for the reconstruction of 0.0269, which relates\nto the deposited energy.\n\nThe minimum false alarm rate coincidence from our analysis associates\nthis neutrino with one Fermi LAT photon. The photon is detected at\n09:35:16.96 UT with coordinates R.A. 02:54:06.79, Dec. -18:01:00.12\n(J2000) and energy 778.3 MeV. The best-fit localization and\nuncertainty for a point source yielding the ANTARES 200108A neutrino and\nthe photon is as quoted above. The false alarm rate for ANTARES\nneutrino + Fermi LAT gamma-ray coincidences of this quality or better\nis 1 per 0.419 years.\n\nDetails of the ANTARES + Fermi LAT coincidence search procedures are\nprovided in Ayala Solares et al. 2019 (ApJ 886, 98). False alarm rates\nare established from 73,000 years of simulated observation and take\ninto account the point spread functions of the associated neutrino +\nphotons, the known backgrounds at this sky position, the energy of the\nneutrino, and the energies of the Fermi LAT photons (within broad ranges).\n\nThis nearest LAT source to this transient is 3FGL J0251.1-1829, which\nis 0.77 deg away, within the 90%-containment region for this\ncoincidence.\n\nWe provide the associated AMON alert for this coincidence in GCN Alert\nformat, below.\"\n\n//////////////////////////////////////////////////////////////////////\nTITLE: GCN/AMON NOTICE\nNOTICE_DATE: Wed 08 Jan 2020 09:30:14.48 UT\nNOTICE_TYPE: Fermi-LAT ANTARES coincidence\nAMON_NUM: 1440223121\nSRC_RA: 43.4818d {+02h 53m 55.6s} (J2000),\n43.7129 d{+02h 54m 51.1s} (current),\n42.9035d {02:51:36.8} (1950)\nSRC_DEC: -18.0673d {-18d 04��� 02\"} (J2000),\n17.9866d {-17d 59��� 12\"} (current),\n-18.2702d {-18d 16' 13\"} (1950)\n\nSRC_ERROR90: 0.832 [deg, stat, 90% containment]\nDISCOVERY_DATE: 18856 TJD;  8 DOY; 20/01/082 (yy/mm/dd)\nDISCOVERY_TIME: 34214 SOD {01:42:52.783} UT\nREVISION: 0\nDELTA_T: 604.96 [sec]\nSIGMA_T: 302.48 [sec]\nFAR: 2.387 [yr^-1]\nSUN_POSTN: 289.0042d {+19h 16m 01s} -22.2867d {-22d 17��� 12\"}\nSUN_DIST: 104.29 [deg] Sun_angle= 6.95 [hr] (East of Sun)\nMOON_POSTN: 79.4917d {+05h 17m 58s} +21.4503 {+21d 27��� 01\"}\nMOON_DIST: 53.03 [deg]\nGAL_COORDS: 201.6015, -60.4037  [deg] galactic lon,lat of the event\nCOMMENTS: ALERT FROM FERMI-LAT ANTARES COINCIDENCE STREAM\n\n++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n\nColin F. Turley\n860-685-1260 Cell\ncft114@psu.edu email\n\nDepartment of Physics, Penn State University\n104 Davey Lab, Box 52\nUniversity Park, PA 16802-6300",
  "circularId": 26674,
  "createdOn": 1578512809000,
  "email": "cft114@psu.edu",
  "subject": "Fermi-LAT ANTARES coincidence",
  "submitter": "Colin F Turley at AMON, Penn State U  <cft114@psu.edu>"
}