{
  "bibcode": "2005GCN..3093....1B",
  "body": "A. Blustin (MSSL), G. Branduardi-Raymont (MSSL), A. Breeveld\n(MSSL), C. Brocksopp (MSSL), M. Cropper (MSSL), C. James\n(MSSL), N. Loaring (MSSL), K. Mason (MSSL), K. McGowan (MSSL),\nM. de Pasquale (MSSL), M. Page (MSSL), T. Poole (MSSL),\nG. Ramsay (MSSL), S. Rosen (MSSL), C. Saxton (MSSL), P. Schady\n(MSSL), K. Wu (MSSL), S. Zane (MSSL), H. Ziaeepour (MSSL) on\nbehalf of the XMM-Newton Optical Monitor team\n\n\nThe XMM-Newton Optical Monitor began observations of GRB050223\nat 14:23:15 on 2005-02-23, about 11 hours after the initial\nSwift BAT trigger (Mitani et al, GCN 3055). We detect no\nsource at the position of the XMM-Newton pn source\n(Gonzalez-Riestra et al, GCN 3060). The estimated limiting\nmagnitudes (5-sigma) in each of the OM filters are as follows:\n\nFilter  Lim_Mag  Duration  T_start\n\nB       21.22    4000      T+40449\nUVW1    20.24    2500      T+60374\nUVW1    20.49    4000      T+63181\nUVM2    19.60    4000      T+67488\nUVM2    19.56    4000      T+71795\nUVW2    18.70    4000      T+76102\nUVW2    18.67    4000      T+80409\nUVW2    18.64    4000      T+84716\n\nThis message may be cited.",
  "circularId": 3093,
  "createdOn": 1110915346000,
  "email": "ajb@mssl.ucl.ac.uk",
  "subject": "GRB050223: No XMM-Newton OM detection of afterglow emission",
  "submitter": "Alexander Blustin at MSSL-UCL  <ajb@mssl.ucl.ac.uk>",
  "eventId": "GRB 050223"
}