{
  "bibcode": "2017GCN.21220....1E",
  "body": "S.W.K. Emery (UCL-MSSL) and A. D'Ai (INAF-IASFPA)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 170607A\n84 s after the BAT trigger (D'Ai et al., GCN Circ. 21214).\nGRB 170607A was also triggered by Fermi GBM\n(Hamburg and Meegan GCN Circ. 21218)\nWe detect a fading afterglow consistent with the position given by XRT\n(Beardmore et al., GCN Circ. 21215) and ground-based optical detections\n(Heintz et al., GCN Circ. 21217; Lipunov et al., GCN Circ. 21219).\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  00:29:27.82 =   7.36591 (deg.)\n    Dec (J2000) = +09:14:36.0  =   9.24334 (deg.)\nwith an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).\n\nPreliminary detections using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite_FC            84          233          147         15.76 +/- 0.02\nwhite              575         5285          461         17.11 +/- 0.03\nwhite             6895         7065          197         17.50 +/- 0.04\nv                  625         5696          313         17.51 +/- 0.11\nb                  551         1859          132         17.63 +/- 0.09\nu_FC               295          545          246         16.14 +/- 0.04\nu                  699         6205          210         16.80 +/- 0.06\nu                 6454        29372         1601         17.68 +/- 0.04\nuvw1               847         6105          313         16.87 +/- 0.06\nuvm2              5700         5900          197         16.86 +/- 0.09\nuvw2              1720         5491          216         17.04 +/- 0.07\n\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.04 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 21220,
  "createdOn": 1496926596000,
  "email": "samuel.emery.15@ucl.ac.uk",
  "subject": "GRB 170607A: Swift/UVOT Detection",
  "submitter": "Sam Emery at MSSL-UCL  <samuel.emery.15@ucl.ac.uk>",
  "eventId": "GRB 170607A"
}