{
  "bibcode": "2008GCN..7927....1M",
  "body": "F.E. Marshall (NASA/GSFC) and C. Pagani (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT observed the field of Swift trigger number 315630 \nstarting 95 s after the BAT trigger (Pagani et al., GCN Circ. 7912).  \nNo afterglow has been detected in either the X-ray\n(Barthelmy et al., GCN Circ. 7921) or optical\n(Gonsalves et al., GCN Circ. 7922) bands. \nWe do not find a source in any of the UVOT observations inside \nthe ground-calculated BAT error circle (Barthelmy et al., GCN Circ. 7921).\nThe first UVOT finding chart exposure covers only about 90% of\nthe BAT error region, but the other exposures cover the entire\nBAT error region. The 3-sigma upper limits for detecting\na source in the first finding chart (FC) exposure and co-added frames are:\n\nFilter            T_start(s)   T_stop(s)     Exp(s)     Mag (3-sigma UL)\n\nwhite (FC)          95          194           98        >19.7\nwhite               95         4573          241        >20.4\nv                  201         5854          216        >18.6\nb                 4225         4424          197        >19.9\nu                 4019         4218          197        >19.8\nuvw1              3815         4014          197        >19.6\nuvm2              3609         5995          329        >20.2\nuvw2              5450         5649          197        >19.5\n\nThe values quoted above are not corrected for the expected Galactic\nextinction corresponding to a reddening of E(B-V) = 0.051 mag in\nthe direction of the burst (Schlegel et al. 1998).",
  "circularId": 7927,
  "createdOn": 1215036343000,
  "email": "marshall@milkyway.gsfc.nasa.gov",
  "subject": "Swift Trigger 315630: Swift/UVOT Upper Limits",
  "submitter": "Frank Marshall at GSFC  <marshall@milkyway.gsfc.nasa.gov>"
}