{
  "id": "1106.4934",
  "version": "v1",
  "published": "2011-06-24T10:24:57.000Z",
  "updated": "2011-06-24T10:24:57.000Z",
  "title": "The Suzaku Discovery of A Hard Power-Law Component in the Spectra of Short Bursts from SGR 0501+4516",
  "authors": [
    "Yujin E. Nakagawa",
    "Kazuo Makishima",
    "Teruaki Enoto"
  ],
  "comment": "11 pages, 8 figures, 2 tables, Accepted for publication in PASJ (Suzaku & MAXI special issue)",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Using data with the Suzaku XIS and HXD, spectral studies of short bursts from the soft gamma repeater SGR 0501+4516 were performed. In total, 32 bursts were detected during the ~60 ks of observation conducted in the 2008 August activity. Excluding the strongest one, the remaining 31 bursts showed an average 2--40 keV fluence of 1.0(-0.5,+0.3)*10^-9 erg cm^-2. A 1--40 keV spectrum summed over them leaves significant positive residuals in the HXD-PIN band with chi^2/d.o.f. = 74/50, when fitted with a two-blackbody function. By adding a power law model, the fit became acceptable with chi^2/d.o.f. = 56/48, yielding a photon index of Gamma=1.0(-0.3,+0.4). This photon index is comparable to Gamma=1.33(-0.16,+0.23) (Enoto et al. 2010a) for the persistent emission of the same object obtained with Suzaku. The two-blackbody components showed very similar ratios, both in the temperature and the emission radii, to those comprising the persistent emission. However, the power-law to two-blackbody flux ratio was possibly higher than that of the persistent emission at 2.6 sigma level. Based on these measurements, average wide-band properties of these relatively weak bursts are compared with those of the persistent emission.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-06-24T10:24:57.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hard power-law component",
      "short bursts",
      "suzaku discovery",
      "persistent emission",
      "soft gamma repeater sgr"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/pasj/63.sp3.S813",
      "journal": "Publications of the Astronomical Society of Japan",
      "year": 2011,
      "month": "Nov",
      "volume": 63
    },
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 915851,
      "adsabs": "2011PASJ...63S.813N"
    }
  }
}