{
  "bibcode": "2011GCN.11910....1B",
  "body": "A. A. Breeveld (MSSL/UCL), M. M. Chester (PSU), S. T. Holland \n(CRESST/USRA/GSFC) , F.E. Marshall (NASA/GSFC) and J. R. Cummings \n(NASA/UMBC) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT has been observing the field of GRB110328A/Swift \nJ164449.3+573451 since 1483s after the initial trigger (Cummings et \nal., GCN Circ. 11823). We have found no source in any filter at the \nposition of the afterglow (Cenko et al., GCN Circ. 11827), using \nindividual exposures or summed exposures.\n\nSumming up all the data in each filter, beginning with the first BAT \ntrigger on 28th March through 7th April, we have obtained the \nfollowing 3-sigma upper limits using the UVOT photometric system \n(Poole et al. 2008, MNRAS, 383, 627):\n\nFilter           Exp(s)    Mag\n---------------------------------------------------------------------\nwhite            29579     >23.9\nv                2541      >21.1\nb                1493      >21.5\nu                58559     >23.5\nw1               59906     >23.4\nm2               29000     >23.0\nw2               15547     >22.9\n\nThe values quoted above are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.02 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 11910,
  "createdOn": 1302287926000,
  "email": "aab@mssl.ucl.ac.uk",
  "subject": "GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits",
  "submitter": "Alice Breeveld at MSSL-UCL  <aab@mssl.ucl.ac.uk>",
  "eventId": "GRB 110328A"
}