[Tue Jun 26 06:24:20 2012] Detection parameters:
  Position = (303.3, 271.9) = 5 25 5.88 -69 39 0.9
  Extent = 10.9" x 10.9", rotation angle = 0 degrees
  Source counts = 93463.7 +/- 359.9
  Background counts = 61.7
  Rate = 4 +/- 0.01

[Tue Jun 26 06:24:21 2012] Off-axis axis estimate = 1.95'
[Tue Jun 26 23:25:49 2012] Using EEF radius (= 7.40 ")to estimate initial spatial extent for simple fitting
[Tue Jun 26 23:25:49 2012] Initial guess for spatial extent in simple fitting = 7.40"
[Tue Jun 26 23:25:49 2012] source mask rpix=1.7, npix_max = 19, mask sum = 16, frac = 0.825
[Tue Jun 26 23:25:49 2012] Giving source the simple spatial ID 1 for pass 0, mean size = 7.40"
[Wed Jun 27 08:46:09 2012] fullrun_mos1_xmm0157160601_pi300-10000_cl_pass0_src1.ximg exists
[Wed Jun 27 08:46:10 2012] fullrun_mos1_xmm0157160601_pi300-10000_cl_pass0_src1_1.ximg exists
[Wed Jun 27 08:46:10 2012] Fit fullrun_mos1_xmm0157160601_pi300-10000_cl_pass0_src1 appears to have run properly
[Wed Jun 27 08:46:10 2012] fullrun_mos1_xmm0157160601_pi300-10000_cl_pass0_tfrozen_src1.ximg exists
[Wed Jun 27 08:46:10 2012] fullrun_mos1_xmm0157160601_pi300-10000_cl_pass0_tfrozen_src1_1.ximg exists
[Wed Jun 27 08:46:10 2012] Fit fullrun_mos1_xmm0157160601_pi300-10000_cl_pass0_tfrozen_src1 appears to have run properly
[Wed Jun 27 10:44:06 2012] Spatial fit model total counts = 210369.000000, observed total counts = 230662.000000
[Wed Jun 27 10:44:06 2012] Offset between fit and detection position for source 2 = 2.119182 pixels
[Wed Jun 27 10:44:06 2012] 200973.000000 total counts/ 25600.000000 bgd. counts: snr = 1096.081250
Spatial fit parameters:
  Offset between fit and detection position for source 2 = 2.119182 pixels
  Position = (303.6, 274.0) = 5 25 5.61 -69 38 51.9
  Extent = 14.8 (14.8-29.6)", rotation angle = 0
  Source counts = 175373.0 +/- 448.3
  Background counts = 25600.0
  Rate = 7 +/- 0.02
[Wed Jun 27 10:44:06 2012] Spatial fit model total counts = 156953.000000, observed total counts = 183784.000000
[Wed Jun 27 10:44:06 2012] Poor agreement between spatial fit and data for source 2
It may help to tweak spatial fit manually
Not incorporating fit results
[Wed Jun 27 10:44:06 2012] Vigneting correction estimate = 1.000000
[Wed Jun 27 10:44:06 2012] Source flux estimate in the 0.3-8.0 bandpass, Gamma=1.800000 = 0 
[Wed Jun 27 10:44:06 2012] Assessing source extent using major axis lower bound
[Wed Jun 27 10:44:06 2012] Source does appear to be extended
[Wed Jun 27 10:44:06 2012] Computing asymmetry using major and minor axis, asym = 1.00
[Wed Jun 27 10:44:06 2012] Source is confused with source 1
[Wed Jun 27 10:44:06 2012] Source is confused with source 5
[Wed Jun 27 22:40:48 2012] Using previous fit value to estimate initial spatial extent for simple fitting
[Wed Jun 27 22:40:48 2012] Setting initial spatial extent for simple fitting to maximum allowed for this pass
[Wed Jun 27 22:40:48 2012] Initial guess for spatial extent in simple fitting = 14.81"
[Wed Jun 27 22:40:48 2012] source mask rpix=3.4, npix_max = 60, mask sum = 46, frac = 0.754
[Wed Jun 27 22:40:48 2012] Giving source the simple spatial ID 1 for pass 1, mean size = 14.81"
[Thu Jun 28 13:46:15 2012] fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_src1.ximg exists
[Thu Jun 28 13:46:15 2012] fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_src1_1.ximg exists
[Thu Jun 28 13:46:15 2012] Fit fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_src1 appears to have run properly
[Thu Jun 28 13:46:15 2012] fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_tfrozen_src1.ximg exists
[Thu Jun 28 13:46:15 2012] Warning: poor agreement between model and actual number of counts may be indicative of a poor fit in csv/fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_tfrozen_src1.csv
[Thu Jun 28 13:46:15 2012] fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_tfrozen_src1_1.ximg exists
[Thu Jun 28 13:46:15 2012] Warning: poor agreement between model and actual number of counts may be indicative of a poor fit in csv/fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_tfrozen_src1.csv
[Thu Jun 28 13:46:15 2012] It looks like the fit did not converge
You should probably delete fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_tfrozen_src1_1.ximg
Either tweak this fit manually starting from fullrun_mos1_xmm0157160601_pi300-10000_cl_pass1_tfrozen_src1.ximg or adjust the simplespatial fit parameters in $XASSIST/data/missions/*/*/spatial.dat and re-run simplespatial fitting after setting file recreation parameter to yes