TITLE:   GCN CIRCULAR
NUMBER:  3093
SUBJECT: GRB050223: No XMM-Newton OM detection of afterglow emission
DATE:    05/03/15 19:35:46 GMT
FROM:    Alexander Blustin at MSSL-UCL  <ajb@mssl.ucl.ac.uk>

A. Blustin (MSSL), G. Branduardi-Raymont (MSSL), A. Breeveld
(MSSL), C. Brocksopp (MSSL), M. Cropper (MSSL), C. James
(MSSL), N. Loaring (MSSL), K. Mason (MSSL), K. McGowan (MSSL),
M. de Pasquale (MSSL), M. Page (MSSL), T. Poole (MSSL),
G. Ramsay (MSSL), S. Rosen (MSSL), C. Saxton (MSSL), P. Schady
(MSSL), K. Wu (MSSL), S. Zane (MSSL), H. Ziaeepour (MSSL) on
behalf of the XMM-Newton Optical Monitor team


The XMM-Newton Optical Monitor began observations of GRB050223
at 14:23:15 on 2005-02-23, about 11 hours after the initial
Swift BAT trigger (Mitani et al, GCN 3055). We detect no
source at the position of the XMM-Newton pn source
(Gonzalez-Riestra et al, GCN 3060). The estimated limiting
magnitudes (5-sigma) in each of the OM filters are as follows:

Filter  Lim_Mag  Duration  T_start

B       21.22    4000      T+40449
UVW1    20.24    2500      T+60374
UVW1    20.49    4000      T+63181
UVM2    19.60    4000      T+67488
UVM2    19.56    4000      T+71795
UVW2    18.70    4000      T+76102
UVW2    18.67    4000      T+80409
UVW2    18.64    4000      T+84716

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