batgrbproduct Analysis for Trigger=302506

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Tue Feb  5 22:34:47 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger302506/GCN5_download_cron
======================================================================

  Trigger: 00302506      Segment: 000

  BAT Trigger Time: 223890954.304   [s; MET]
      Trigger Stop: 223890955.328   [s; MET]
               UTC: 2008-02-05T07:55:51.751640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 98.2192547486492   Dec: 62.7686859637972  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.53
     Image Trigger?:     NO
     Rate S/N Ratio:     15.0996688705415  [ if not an image trigger ]
     Image S/N Ratio:    8.53

  Flight Position:   [ source = BAT ]
    RA: 98.2192547486492   Dec: 62.7686859637972  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 98.2609154800131   Dec: 62.7821541810855  [deg; J2000]  
        { 06h 33m 02.6s , +62d 46' 55.8" }
         +/- 1.53703698888576 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.687964869330796 [arcmin] (formal 1-sigma fit error)
    SNR: 16.4598735983302
    RA  =   6h 33m  2.6s  (98.260915 deg.)
    Dec =  62d 46' 56" (62.782154 deg.)
 
  Angular difference between Flight and Ground position is 1.400246 arcmin
 
  Partial Coding Fraction: 0.5234375    [ including projection effects ]

  Duration
     T90: 106.460000008345 +/- 4.95726093935357
        Measured from: -5.4879999756813
                   to: 100.972000032663     [s; relative to TRIGTIME]
     T50: 84.7800000011921 +/- 4.9962742211341
        Measured from: 5.14000001549721
                   to: 89.9200000166893     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.224000006914139     
                   to: 1.22400000691414     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.0760000050068     
                   to: 105.332000017166     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.396616   1.403651   0.732437   0.087069
           0.067148   0.067055   0.058464   0.049381 [error]
 Peak      0.054059   0.061526   0.023801   0.010011
           0.008203   0.008200   0.006981   0.005630 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1    Band2    Band3    Band4    Band5    Total      
                       15-25    25-50   50-100  100-350   15-150   15-350   keV
Fluence   Power-law 4.99e-07 6.45e-07 6.10e-07 1.02e-06 2.09e-06 2.77e-06   erg/cm2
              Error 4.90e-08 3.82e-08 6.00e-08 2.09e-07 1.35e-07 2.63e-07   erg/cm2
Peak flux Power-law 6.21e-01 4.59e-01 2.25e-01 1.57e-01 1.38e+00 1.46e+00   ph/cm2/s
              Error 1.46e-01 7.34e-02 5.92e-02 7.95e-02 2.23e-01 2.34e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.89e-07 6.54e-07 6.11e-07 8.20e-07 2.07e-06 2.56e-06   erg/cm2
              Error 5.77e-08 4.62e-08 6.13e-08 4.07e-07 1.17e-07 4.51e-07   erg/cm2
Peak flux Cutoff-PL 6.08e-01 4.72e-01 2.26e-01 1.13e-01 1.37e+00 1.42e+00   ph/cm2/s
              Error 1.63e-01 9.93e-02 6.46e-02 9.77e-02 1.70e-01 2.67e-01   ph/cm2/s
 
Fluence        Band 4.83e-07 6.51e-07 6.10e-07 8.24e-07 2.07e-06 2.62e-06   erg/cm2
              Error 5.71e-08 4.60e-08 6.15e-08 4.07e-07 1.54e-07 4.44e-07   erg/cm2
Peak flux      Band 5.87e-01 4.93e-01 2.19e-01 1.18e-01 1.36e+00 1.42e+00   ph/cm2/s
              Error 1.74e-01 1.03e-01 5.62e-02 1.19e-01 2.28e-01 2.54e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.081    0.122    -      -           1.96e-03 1.36e-04   41.991 57
CPL   1.852    0.000      30.8    0.0      2.57e-03 1.53e-03   41.874  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.026    0.305    -      -           9.08e-03 1.81e-03   60.433 57
CPL   1.796    1.094      37.9 4999.7      1.23e-02 7.69e-02   60.345  0
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom
 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 105.344000 sec.
T50 in the 50-300 keV band: 27.840000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  115.408  -10.076  105.332
T90   106.460   -5.488  100.972
T50    84.780    5.140   89.920
Peak    1.000    0.224    1.224

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   98.2609 +62.7822 0.0116   38.4 -145.0       1.1546    16.5  TRIG_00302506       
------------------------------------------
 
Foreground time interval of the image:
-10.076  14.297 (delta_t =  24.373 [sec])
Background time interval of the image:
-179.203 -79.634 (delta_t =  99.569 [sec])
-78.304 -10.076 (delta_t =  68.228 [sec])

Lightcurves

Notes:

1 s binning

From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval

64 ms binning

Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Spectra

Notes:

Time averaged spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  -10.076 sec. to  105.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.08141     ( -0.120004   0.123499 )
Norm@50keV  : 1.957224E-03    ( -1.374340E-04   1.354236E-04) )
------------------------------------------------------------
 Chi-Squared =      41.99075     using    59 PHA bins.
 Reduced chi-squared =     0.7366797     for     57 degrees of freedom
 Null hypothesis probability = 0.932
 
Photon flux (15-150 keV)    in 115.4 sec: 0.305127 ( -0.019179  0.019258 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.09491e-06 ( -1.34845e-07  1.35699e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -10.076 sec. to  105.332 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.85193     (     )
Epeak [keV] : 30.8467      (   )
Norm@50keV  : 2.569687E-03    ( -1.332084E-03   1.735340E-03) )
------------------------------------------------------------
 Chi-Squared =      41.87393     using    59 PHA bins.
 but latest trial  1.904428E-03 gives Chi-Squared =  0.308491
 Reduced chi-squared =     0.7477487     for     56 degrees of freedom
 Null hypothesis probability = 0.920
 
Photon flux (15-150 keV)    in 115.4 sec: 0.302514 ( -0.019171  0.018929 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07293e-06 ( -1.60833e-07  7.2425e-08 ) ergs/cm2
 
Band function
Time interval is from  -10.076 sec. to  105.332 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.71300   ( -2.24352   8.23275 )
beta        : -2.12670    ( -0.123470   0.120023 )
Epeak [keV] : 25.8729      ( -25.7729 9974.13 )
Norm@50keV   : 3.360493E-03    ( -1.867864E-02   1.840696E-02) )
------------------------------------------------------------
 Chi-Squared =      42.28710     using    59 PHA bins.
 Reduced chi-squared =     0.7688563     for     55 degrees of freedom
 Null hypothesis probability = 0.895
 
Photon flux (15-150 keV)    in 115.4 sec: 0.302519 ( -0.021021  0.020894 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.06972e-06 ( -1.56402e-07  1.51705e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.224 sec. to    1.224 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.02634     ( -0.292143   0.318150 )
Norm@50keV  : 9.082811E-03    ( -1.849898E-03   1.771701E-03) )
------------------------------------------------------------
 Chi-Squared =      60.43256     using    59 PHA bins.
 Reduced chi-squared =      1.060220     for     57 degrees of freedom
 Null hypothesis probability = 0.353
 
Photon flux (15-150 keV)    in 1.000 sec: 1.37918 ( -0.22265  0.22284 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.38432e-08 ( -1.55359e-08  1.59599e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.224 sec. to    1.224 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.79564     ( -1.85710   0.331623 )
Epeak [keV] : 37.8555      ( -37.2557 9962.14 )
Norm@50keV  : 1.232777E-02    ( -1.232777E-02   0.141554 )
------------------------------------------------------------
 Chi-Squared =      60.34454     using    59 PHA bins.
 but latest trial   2.12726     gives Chi-Squared =  0.165596
 but latest trial  0.674587     gives Chi-Squared =  0.158138
 Reduced chi-squared =      1.077581     for     56 degrees of freedom
 Null hypothesis probability = 0.322
 
Photon flux (15-150 keV)    in 1.000 sec: 1.36981 ( -0.11706  0.22332 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.20413e-08 ( -1.84896e-08  1.74937e-08 ) ergs/cm2
 
Band function
Time interval is from    0.224 sec. to    1.224 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.37492   ( -8.62508   3.51800 )
beta        : -2.28140    ( -7.71860   0.520287 )
Epeak [keV] : 36.8736      ( -36.7736 232.215 )
Norm@50keV   : 2.240369E-02    ( -9.967863E-03   1269.88 )
------------------------------------------------------------
 Chi-Squared =      59.95060     using    59 PHA bins.
 Reduced chi-squared =      1.090011     for     55 degrees of freedom
 Null hypothesis probability = 0.301
 
Photon flux (15-150 keV)    in 1.000 sec: 1.35909 ( -0.22977  0.22679 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.13841e-08 ( -1.64866e-08  1.60039e-08 ) ergs/cm2
 
Plot creation:
Tue Feb  5 22:59:16 EST 2008