{
  "bibcode": "2008GCN..7702....1B",
  "body": "A. A. Breeveld (MSSL/UCL) and W. H. Baumgartner (GSFC/UMBC)\non behalf of the Swift/UVOT team.\n\nThe Swift Ultra-Violet/Optical Telescope (UVOT) started a ToO \nobservation of GRB 080507 (Lapshov et al., GCN Circ. 7697) 109312s \nafter the AGILE trigger. At the position of the afterglow candidate \nseen in the Tautenburg telescope (Kann et al. GCN Circ. 7701), which \nalso corresponds to the  brightest source in the Swift XRT (V. Mangano \net al. GCN Circ. 7699), the UVOT has a very faint source that does not \nappear in DSS or SDSS. It is only detectable in summed white images, \nbut does NOT appear to be fading.\n\nThe limiting magnitudes for the initial exposure and detections in \nsummed images are as follows:\n\nFilter         T_start(s)  T_stop(s)  Exp(s)  Mag\n\nwhite         109312  109526  211.4     >21.3 (UL)\nwhite         109312  111881  2462.3   22.6 +/- 0.4 (3 sig)\nwhite\t111881  116511  1355.3   22.1 +/- 0.3 (3.8 sig)\n\nThe values quoted above are in the UVOT photometric system\n(Poole et al. 2008, MNRAS, 383, 627) and are not corrected for galactic \nreddening.",
  "circularId": 7702,
  "createdOn": 1210341771000,
  "email": "aad@mssl.ucl.ac.uk",
  "subject": "GRB080507: Swift/UVOT followup observations",
  "submitter": "Alice Breeveld at MSSL-UCL  <aad@mssl.ucl.ac.uk>",
  "eventId": "GRB 080507"
}