{
  "bibcode": "2019GCN.23725....1S",
  "body": "M. H. Siegel (PSU) and J. D. Gropp (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 190114C\n74 s after the BAT trigger (Gropp et al., GCN Circ. 23688).\nA source consistent with the XRT position\n(Osborne et al. GCN Circ. 23704) and previously reported optical \ndetections (Tyurina et al., GCN Circ. 23690, Selsing et al., GCN Circ. 23695,\nIzzy et al., GCN Circ. 23699, Bolmer & Schady, GCN Circ. 23702, Im et al.,\nGCN Circ. 23717) is detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n   RA  (J2000) =  03:38:01.16 =  54.50484 (deg.)\n   Dec (J2000) = -26:56:46.9  = -26.94637 (deg.)\nwith an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).\n\nThe data of the first few orbits shows the afterglow to fade rapidly, particularly\nin the NUV filters, which could be consistent with the heavy extinction reported by\nKann et al. (GCN Circ. 23710).\n\nPreliminary detections 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 (fc)          74          224          147      14.89+/-0.02\nwhite              566          586           19      16.90+/-0.07\nwhite             5851         6050          196      19.19+/-0.09\nwhite            21950        22857          885      20.22+/-0.09\nv                  616          627           10      16.28+/-0.19\nv                16295        17136          820      18.97+/-0.13\nv                26775        27682          885      19.41+/-0.24\nv                39149        57221         1694      19.92+/-0.20\nb                  542          561           19      17.38+/-0.14\nb                 5646         5845          196      19.38+/-0.16\nb                21038        46521         1591      20.83+/-0.26\nu (fc)             286          536          245      17.58+/-0.07\nu                33738        34038          295            >20.28\nuvw1              4044        51522         3671      21.05+/-0.31\nuvm2              3839        50615         3251      21.00+/-0.30\nuvw2              6056        56384         3552            >21.33\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.01 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 23725,
  "createdOn": 1547582342000,
  "email": "mhs18@psu.edu",
  "subject": "GRB 190114C: Swift/UVOT Detection",
  "submitter": "Mike Siegel at PSU/Swift MOC  <mhs18@psu.edu>",
  "eventId": "GRB 190114C"
}