{
  "bibcode": "2008GCN..7901....1B",
  "body": "A. A. Breeveld (MSSL/UCL) and T. N. Ukwatta (GSFC/GWU) report on behalf\nof the Swift/UVOT team.\n\nThe Swift Ultra-Violet/Optical Telescope (UVOT) began settled\nobservations of GRB 080623 (Ukwatta et al., GCN Circ. 7894) 22.15 \nminutes after the trigger, as reported in Holland, GCN Circ. 7896.  We \nconfirm that no afterglow is detected at the position of the enhanced \nXRT position (Beardmore et al., GCN Circ. 7898) in the initial finding \nchart or subsequent summed images.\n\nThe following table gives the 3 sigma upper limits in all filters.\n\nFilter  T_start(s)  T_stop(s)  Exp(s)  Mag UL (3sig)\n\nwhite   1329        1428       98.1    >20.4\nwhite   1559        2713       76.9    >20.3\nwhite   8133        8332      196.6    >20.8\nv       1436        2598      155.6    >19.0\nb       1535        2698      155.5    >19.9\nu       1510        2673      155.4    >19.7\nuvw1    1486        2648      155.5    >19.4\nuvm2    1460        2623      155.6    >19.1\nuvw2    1575        2573      136.1    >19.3\n\nThe values quoted above are in the UVOT photometric system (Poole et al.\n2008, MNRAS, 383, 627).  No correction has been made for the large \nexpected extinction corresponding to E(B-V) of 0.35 mag in\nthe direction of the burst (Schlegel et al. 1998).",
  "circularId": 7901,
  "createdOn": 1214253784000,
  "email": "aad@mssl.ucl.ac.uk",
  "subject": "GRB080623: Swift UVOT followup observations",
  "submitter": "Alice Breeveld at MSSL-UCL  <aad@mssl.ucl.ac.uk>",
  "eventId": "GRB 080623"
}