{
  "id": "1805.05722",
  "version": "v1",
  "published": "2018-05-15T12:08:53.000Z",
  "updated": "2018-05-15T12:08:53.000Z",
  "title": "A lower occurrence rate of bright X-ray flares in SN-GRBs than $z<1$ GRBs: evidence of energy partitions?",
  "authors": [
    "Hui-Jun Mu",
    "Wei-Min Gu",
    "Jirong Mao",
    "Tong Liu",
    "Shu-Jin Hou",
    "Da-Bin Lin",
    "Junfeng Wang",
    "Taotao Fang",
    "En-Wei Liang"
  ],
  "comment": "10 pages, 4 figures, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The occurrence rates of bright X-ray flares in z<1 gamma-ray bursts (GRBs) with or without observed supernovae (SNe) association were compared. Our Sample I: the z<1 long GRBs (LGRBs) with SNe association (SN-GRBs) and with early Swift/X-Ray Telescope (XRT) observations, consists of 18 GRBs, among which only two GRBs have bright X-ray flares. Our Sample II: for comparison, all the z<1 LGRBs without observed SNe association and with early Swift/XRT observations, consists of 45 GRBs, among which 16 GRBs present bright X-ray flares. Thus, the study indicates a lower occurrence rate of bright X-ray flares in Sample I (11.1%) than in Sample II (35.6%). In addition, if dim X-ray fluctuations are included as flares, then 16.7% of Sample I and 55.6% of Sample II are found to have flares, again showing the discrepancy between these two samples. We examined the physical origin of these bright X-ray flares and found that most of them are probably related to the central engine reactivity. To understand the discrepancy, we propose that such a lower occurrence rate of flares in the SN-GRB sample may hint at an energy partition among the GRB, SNe, and X-ray flares under a saturated energy budget of massive star explosion.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-05-15T12:08:53.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "bright x-ray flares",
      "lower occurrence rate",
      "energy partition",
      "sne association",
      "central engine reactivity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}