{
  "bibcode": "2020GCN.28475....1S",
  "body": "GRB 200917A: Swift/UVOT Upper Limits\n\nK. K. Simpson (PSU) and E. Sonbas (Adiyaman Univ.)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 200917A\n104 s after the BAT trigger (Sonbas et al., GCN Circ. 28435).\nNo optical afterglow consistent with the XRT position\n(Goad et al. GCN Circ. 28436)\nis detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits 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           104          254          147         >19.9\nu_FC               262          512          246         >20.1\nwhite              104         1708          412         >20.5\nv                  592         1758          136         >18.9\nb                  518         1684          117         >19.5\nu                  262         1832          382         >20.2\nw1                 641         1807          136         >18.7\nm2                1762         1782           19         >18.2\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.19 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 28475,
  "createdOn": 1600805607000,
  "email": "kira.simpson1984@gmail.com",
  "subject": "GRB 200917A: Swift/UVOT Upper Limits",
  "submitter": "Kira Simpson at PSU  <kira.simpson1984@gmail.com>",
  "eventId": "GRB 200917A"
}