{
  "bibcode": "2018GCN.22531....1L",
  "body": "GRB 180324A: Swift/UVOT Upper Limits\n\nS. J. Laporte (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 180324A\n72 s after the BAT trigger (Sonbas et al., GCN Circ. 22524).\nNo optical afterglow consistent with the XRT position\n(Goad et al. GCN Circ. 22529) or RATIR position (Butler et al. GCN Circ. 22528)\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            72          221          147         >19.8\nu_FC               284          534          246         >19.3\nwhite               72        12383         1552         >21.3\nv                  614        13894         1172         >19.5\nb                  539         8158          549         >20.9\nu                  284         7992          814         >20.3\nw1                 664         7787          471         >20.2\nw2                6970        13290         1082         >21.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.90 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 22531,
  "createdOn": 1521934052000,
  "email": "sjl5346@psu.edu",
  "subject": "GRB 180324A: Swift/UVOT Upper Limits",
  "submitter": "Sam LaPorte at PSU  <sjl5346@psu.edu>",
  "eventId": "GRB 180324A"
}