{
  "bibcode": "2020GCN.26962....1K",
  "body": "N. P. M. Kuin (UCL-MSSL) and B. Sbarufatti (PSU)report on behalf of\nthe Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 200131A\n78 s after the BAT trigger (Sbarufatti et al., GCN Circ. 26953).\nA source consistent with the XRT position (Goad et al. GCN Circ. 26956)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  00:12:22.57 =   3.09405 (deg.)\n    Dec (J2000) = +51:07:00.3  =  51.11675 (deg.)\nwith an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).\n\nThe source has been detected also by MASTER (Lipunov et al. GCN Circ. No.\n26954), RATIR (Butler et al., GCN Circ. No. 26957), MacDonalds Observatory\n(Strausbaugh et al., GCN Circ. No. 26959),  and VIRT (Gokuldass et al.,\nGCN Circ. No. 26960.\n\nPreliminary detections using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures\nare:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite               78          227          147         15.47 +/- 0.02\nv                 4281         5919          393         19.57 +/- 0.28\nb                 5103         5303          197         19.53 +/- 0.16\nu                  290          323           32         16.09 +/- 0.08\nw1                4692         4892          197         18.48 +/- 0.18\nm2                4486         6124          393         18.98 +/- 0.20\nw2                4076         5714          393         19.06 +/- 0.19\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.17 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 26962,
  "createdOn": 1580567868000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 200131A: Swift/UVOT Detection",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 200131A"
}