{
  "bibcode": "2015GCN.17472....1M",
  "body": "F. E. Marshall (NASA/GSFC) and C. Pagani (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 150213B\n153 s after the BAT trigger (Pagani et al., GCN Circ. 17464).\nA source consistent with the XRT position\n(Osborne et al. GCN Circ. 17469)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  16:53:48.67 = 253.45278 (deg.)\n    Dec (J2000) = +34:11:19.3  =  34.18869 (deg.)\nwith an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite              153          302          147         18.61 +/- 0.07\nv                 4498        23548          966        >20.3\nb                 3883        12039          961        >20.7\nu                  310          532          218         18.76 +/- 0.15\nw1                4910        10539         1082         20.76 +/- 0.21\nm2                4703        16622         1224         21.25 +/- 0.32\nw2                4293        22956         1279         21.48 +/- 0.31\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.02 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 17472,
  "createdOn": 1423938093000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 150213B: Swift/UVOT Detection",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 150213B"
}