{
  "bibcode": "2009GCN..9435....1S",
  "body": "P. Schady (MSSL-UCL), T. Sakamoto (NASA/UMBC), S. T. Holland \n(CRESST/GSFC/USRA) and F. E. Marshall (NASA/GSFC) report on behalf of the \nSwift UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 090529 206s \nafter the BAT trigger (Sakamoto et al., GCN Circ. 9430) and no new source \nwas detected within the XRT position in the first white finding chart (fc) \n(Sakamoto et al., GCN Circ. 9430; Holland et al., GCN Circ. 9432). \nHowever, a new source is detected within the refined XRT error circle \n(Osborne et al., GCN Circ. 9433) in a second white finding chart, taken at \n883s after the BAT trigger, as well as in a co-added b-band exposure at\n\nRA (J2000)  14:09:52.56   =  212.46892 (deg)\nDec (J2000) +24:27:32.2   =  +24.45892 (deg)\n\nwith an estimated uncertainty of 0.7 arcsec (radius, 90% confidence, \nstatistical + systematic). This source detection is consistent with the \nwhite band detection reported by Xin et al. (GCN Circ. 9431). We note that \nthere is weak evidence that the source could be extended.\n\nThe magnitudes and 3-sigma upper limits for the observations currently \navailable are as follows:\n\nFilter      T_start(s)  T_stop(s)  Exp(s)   Mag/3-sigma UL\n\nwhite_fc1     206        355        147        > 21.09\nwhite_fc2     883        1032       147        20.81 +/- 0.22\nwhite         1185       2587       175        21.55 +/- 0.31\nv             363        2637       253        > 20.24\nb             461        2564       233        20.97 +/- 0.36\nb             2716\t 2824       107        > 20.70\nu             436        2691       253        > 20.87\nuvw1          412        2667       156        > 20.60\nuvm2          387        2661       253        > 20.20\nuvw2          510        2594       253        > 20.65\n\nThe values quoted above are not corrected for the Galactic extinction due \nto the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel \net al. 1998). The photometry is on the UVOT photometric system described \nin Poole et al. (2008, MNRAS, 383, 627).",
  "circularId": 9435,
  "createdOn": 1243635164000,
  "email": "ps@mssl.ucl.ac.uk",
  "subject": "GRB090529: UVOT/Swift detection of a brightening optical afterglow",
  "submitter": "Patricia Schady at MSSL/Swift  <ps@mssl.ucl.ac.uk>",
  "eventId": "GRB 090529"
}