{
  "bibcode": "2015GCN.17828....1D",
  "body": "M. De Pasquale (MSSL-UCL) and B.Cenko (NASA-GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 150518A\n10383 s after the MAXI-GSC trigger (Kawamuro et al, GCN Circ. 17825).\n\nNo UVOT source is detected at the XRT position or within the XRT error\ncircle (Sbarufatti et al., GCN Circ. 17827) in the initial UVOT exposures.\n\nPreliminary 3-sigma upper limit using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) is\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag U.L.\n\nu                10383       20164          364            >20.3\n\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.05 in the direction of the burst\n(Schlegel et al. 1998).\nI.A.S.F.   INAF   Mailing System\nOutgoing mail is certified Virus Free.\nChecked by Kaspersky anti-virus system",
  "circularId": 17828,
  "createdOn": 1432045658000,
  "email": "mdp@ifc.inaf.it",
  "subject": "Swift/UVOT observations of GRB150518A",
  "submitter": "Massimiliano de Pasquale at IASF-Palermo  <mdp@ifc.inaf.it>",
  "eventId": "GRB 150518A"
}