{
  "bibcode": "2015GCN.18005....1B",
  "body": "M.G. Bernardini, P. D'Avanzo, A. Melandri, S. Campana,\nG. Tagliaferri (INAF-OAB), D. Burrows (PSU), K. Page\nand P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:\n\nWe analyzed the full dataset of Swift-XRT observations of the\nSwift trigger 648437 (Bernardini et al., GCN Circ. 18000),\nclassified as short GRB 150710A (Barthelmy et al., GCN Circ.\n18002, Golenetskii et al. GCN Circ. 18003), comprising 11.2 ks in\nPhoton Counting (PC) mode. One X-ray source has been detected\nwithin the BAT error circle at the following position:\n\n  RA (J2000.0):  194.47045  = 12:57:52.91\n  Dec (J2000.0): 14.31807 = +14:19:05.0\n  Error: 2.8 arcsec (radius, 90% conf.)\n\nThis position is consistent with the location of a ROSAT faint source\n1RXS J125754.7+14185. In an initial 0.98 ks observation carried out\nbetween T+57s and T+1056s, the source has an initial count-rate of\n(3.22E-02 �� 6.3E-03) ct/s. Then in a subsequent 10 ks observation,\ncarried out between T+4.9 ks and T+34.5 ks, it is no longer detected\ndown to a 3sigma UL of 1.3E-3 ct/s. The source is near the edge of\nthe Virgo cluster, but the non-detection of any host galaxy by RATIR\n(Butler et al., GCN Circ. 18001) argues against the possibility of this\nbeing a giant SGR flare from a galaxy in the Virgo cluster. Given the\nobserved fading, we propose this source as the X-ray counterpart of\nGRB 150710A.\n\nWe also note the possible presence of a second source at the following \nposition:\n\n  RA (J2000.0):  194.4810088073  =  12:57:55.44\n  Dec (J2000.0): 14.317574983  =  +14:19:03.3\n  Error: 6.0 arcsec (radius, 90% conf.)\n\nalso consistent with the location of 1RXS J125754.7+14185. The source\nis detected at a low significance, and it is not possible with present data\nto assess if is real or not. Further observation can confirm if this second\nsource is real and if it is possibly related to 1RXS J125754.7+14185.\nOtherwise, we cannot exclude that the observed X-ray emission from\nSource #1 is due to a brightening from 1RXS J125754.7+14185.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 18005,
  "createdOn": 1436551751000,
  "email": "grazia.bernardini@brera.inaf.it",
  "subject": "Swift-XRT observations of GRB 150710A",
  "submitter": "Maria Grazia Bernardini at INAF/Brera  <grazia.bernardini@brera.inaf.it>",
  "eventId": "GRB 150710A"
}