{
  "id": "1605.04274",
  "version": "v1",
  "published": "2016-05-13T18:10:57.000Z",
  "updated": "2016-05-13T18:10:57.000Z",
  "title": "Prompt emission from GRB 150915A in the GeV energy range detected at ground by the New-Tupi detector",
  "authors": [
    "C. R. A. Augusto",
    "C. E. Navia",
    "M. N. de Oliveira",
    "A. A. Nepomuceno",
    "V. Kopenkin",
    "T. Sinzi"
  ],
  "comment": "9 pages, 9 figures",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Since 2014, a new detector (New-Tupi) consisting of four plastic scintillators ($150 \\times 75 \\times 5 cm^3$) placed in pairs and located in Niteroi, Rio de Janeiro, Brazil, has been used for the search of transient solar events and photomuons from gamma-ray bursts (GRBs). On September 15, 2015, at 21:18:24 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150915A (trigger 655721). The GRB light curve shows a weak complex structure of long duration $T_{90}=164.7 \\pm 49.7 $ sec, and a fluence in the 15-150 keV band of $8.0 \\pm 1.8 \\times 10^{-7}erg/cm^2$. GRB 150915A was fortuitously located in the field of view of the New-Tupi detector, and a search for prompt emission in the GeV energy range is presented here. The analysis was made using the \"scaler\" or \"single-particle\" technique. The New-Tupi detector registered a muon excess peak of 6.1s duration with a signal significance $6.9\\sigma$, the signal was within the T90 duration of the Swift BAT GRB, with an estimated fluence $4.8 \\times 10^{-6} erg/cm^2$ (10-100 GeV). The Poisson probability of the event to be a background fluctuation is $6.9 \\times 10^{-10}$ and it appears in the counting rate of the New-Tupi detector with an annual rate $\\sim 2.6$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-05-13T18:10:57.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gev energy range",
      "new-tupi detector",
      "grb 150915a",
      "prompt emission",
      "swift burst alert telescope"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1458941
    }
  }
}