{
  "bibcode": "2014GCN.16829....1B",
  "body": "D. N. Burrows (PSU), S. B. Cenko (GSFC), V. D'Elia (ASDC),\nN. Gehrels (NASA/GSFC), C. Gronwall (PSU), J. A. Kennea (PSU),\nH. A. Krimm (CRESST/GSFC/USRA), V. Mangano (PSU),\nF. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester),\nC. Pagani (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU),\nB. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), C. A. Swenson (PSU)\nand E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift Team:\n\nAt 13:30:35 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated the symbiotic star 4U 1700+24 (trigger=612974). \nSwift slewed immediately to the source location. \nThe BAT on-board calculated location is \nRA, Dec 256.633, +23.950 which is \n   RA(J2000) = 17h 06m 32s\n   Dec(J2000) = +23d 57' 01\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  Because this is a 15 minute image trigger,\nthe BAT lightcurve is not immediately available. \n\nThe XRT began observing the field at 13:50:12.7 UT, 1177.2 seconds\nafter the BAT trigger. XRT found a bright X-ray source located at RA,\nDec 256.6459, 23.9711 which is equivalent to:\n   RA(J2000)  = +17h 06m 35.02s\n   Dec(J2000) = +23d 58' 16.0\"\nwith an uncertainty of 5.2 arcseconds (radius, 90% containment). This\nlocation is 87 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position is 6.4 arcseconds from a known X-ray\nsource: 1SXPS J170634.5+235816, and 7.3 arc-seconds from the optical \nposition of V934 Her, thought to be the optical counterpart of 4U 1700+24. \nThis source is in the Swift XRT 1SXPS catalogue with a mean 0.3-10 keV \ncount-rate of 0.3810 +/- 0.0067 ct/sec; see\nhttp://www.swift.ac.uk/1SXPS/1SXPSJ170634.5%2B235816 for\ndetails of these previous observations. \n\nThe initial flux in the 2.5 s image was 1.79e-09 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nUVOT took a finding chart exposure of 64 seconds with the White filter\nstarting 1185 seconds after the BAT trigger. The only source within\nthe XRT error circle is the known bright (V=7.6) optical source V934\nHer. \n\nThe source 4U 1700+24 has been rising in brightness in the Swift/BAT\nhard X-ray transient monitor since 12 September 2014.  It is currently\nseen in the one-day average for 17 September at 0.011 +/- 0.004\nct/s/cm^2 (~50 mCrab; 15-50 keV).",
  "circularId": 16829,
  "createdOn": 1410963064000,
  "email": "palmer@lanl.gov",
  "subject": "Swift detection of outburst from 4U 1700+24",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>"
}