{
  "bibcode": "2013GCN.14937....1P",
  "body": "K.L. Page (U. Leicester), S.R. Oates (UCL-MSSL) and M. De Pasquale\n(UCL-MSSL) report on behalf of the Swift-XRT and UVOT teams:\n\nWe have analysed 9.5 ks of Swift-XRT Photon Counting mode data collected\nfor GRB 130626A, starting 111 s after the trigger (De Pasquale et al., GCN\nCirc. 14931). Of these data, only 10s were collected promptly following\nthe trigger before Swift had to slew away because of a pointing\nconstraint.\n\nWithin the onboard BAT error circle, there is a possible source detected,\nwith a count rate (averaged between 111 s and 34.7 ks after the trigger)\nof (2.0 +0.5/-0.4) x 10^-3 count s^-1. The position of this source is RA,\nDec = 273.14043, -9.50093, which is equivalent to:\n\nRA (J2000):   18h 12m 33.70s\nDec (J2000): -09d 30' 03.3\"\n\nwith an uncertainty of 5.5 arcsec (radius, 90% confidence). It is not\npossible to determine whether this candidate source is fading at present;\na follow-up observation will be performed at a later date.\n\nWe do note, however, that there are other possible sources detected at a\nsimilar level in the XRT field of view, although outside the BAT error\ncircle.\n\nThe Swift-UVOT began settled observations of the field of GRB 130626A\n67 s after the BAT trigger (De Pasquale et al., GCN Circ. 14931).\nIn the initial UVOT exposures, no optical afterglow is found within\nthe BAT error circle or consistent with the candidate XRT position.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial\nexposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite (FC)          67          124          57          >20.5\nwhite               67         5608          597         >22.0\nv                 4384         5892          269         >19.8\nb                 3768         5403          393         >21.1\nu                 3563         5198          393         >20.7\nw1                4794         4993          197         >20.1\n\nThe magnitudes in the table are not corrected for the heavy, but\nuncertain, Galactic extinction due to the reddening of E(B-V) = 1.45 in\nthe direction of the burst (Schlegel et al. 1998).\n\nThis circular is an official product of the Swift-XRT and UVOT teams.",
  "circularId": 14937,
  "createdOn": 1372339905000,
  "email": "klp5@leicester.ac.uk",
  "subject": "GRB 130626A: Swift-XRT possible detection and UVOT upper limits",
  "submitter": "Kim Page at U.of Leicester  <klp5@leicester.ac.uk>",
  "eventId": "GRB 130626A"
}