batgrbproduct Analysis for Trigger=228316

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Jan  2 03:23:18 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger228316/GCN5_download_cron
======================================================================

  Trigger: 00228316      Segment: 000

  BAT Trigger Time: 179224368   [s; MET]
      Trigger Stop: 179224432   [s; MET]
               UTC: 2006-09-06T08:32:46.573080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 40.7485000090217   Dec: 30.3494020585399  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.96
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.96

  Flight Position:   [ source = BAT ]
    RA: 40.7485000090217   Dec: 30.3494020585399  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 40.7097134711121   Dec: 30.3662799831574  [deg; J2000]  
        { 02h 42m 50.3s , +30d 21' 58.6" }
         +/- 2.58427500624567 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.33840594553739 [arcmin] (formal 1-sigma fit error)
    SNR: 7.83543397188559
    RA  =   2h 42m 50.3s  (40.709713 deg.)
    Dec =  30d 21' 59" (30.366280 deg.)
 
  Angular difference between Flight and Ground position is 2.248996 arcmin
 
  Partial Coding Fraction: 0.453125    [ including projection effects ]

  Duration
     T90: 43.5119999945164 +/- 8.16698720444148
        Measured from: -39.9399999976158
                   to: 3.57199999690056     [s; relative to TRIGTIME]
     T50: 14.4679999947548 +/- 2.49773176413273
        Measured from: -32.4799999892712
                   to: -18.0119999945164     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -24.863999992609     
                   to: -23.863999992609     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -41.7960000038147     
                   to: 5.86399999260902     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.339938   1.432484   0.772260   0.163792
           0.065892   0.067056   0.058261   0.048776 [error]
 Peak      0.072546   0.082895   0.046526   0.006012
           0.009708   0.010367   0.008572   0.006892 [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 4.67e-07 6.46e-07 6.59e-07 1.23e-06 2.16e-06 3.00e-06   erg/cm2
              Error 4.32e-08 3.70e-08 5.88e-08 2.26e-07 1.36e-07 2.80e-07   erg/cm2
Peak flux Power-law 8.53e-01 6.33e-01 3.13e-01 2.20e-01 1.90e+00 2.02e+00   ph/cm2/s
              Error 1.68e-01 8.85e-02 7.05e-02 9.29e-02 2.67e-01 2.83e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.39e-07 6.76e-07 6.62e-07 6.20e-07 2.08e-06 2.46e-06   erg/cm2
              Error 5.04e-08 4.75e-08 6.35e-08 4.26e-07 1.57e-07 4.65e-07   erg/cm2
Peak flux Cutoff-PL 7.87e-01 6.98e-01 3.20e-01 8.94e-02 1.87e+00 1.89e+00   ph/cm2/s
              Error 1.92e-01 1.23e-01 8.17e-02 1.27e-01 2.71e-01 2.94e-01   ph/cm2/s
 
Fluence        Band 4.29e-07 6.83e-07 6.38e-07 9.70e-07 2.10e-06 2.74e-06   erg/cm2
              Error 5.35e-08 5.27e-08 7.42e-08 4.38e-07 1.56e-07 3.92e-07   erg/cm2
Peak flux      Band 7.89e-01 6.96e-01 3.19e-01 1.06e-01 1.87e+00 1.92e+00   ph/cm2/s
              Error 1.87e-01 1.17e-01 8.37e-02 1.21e-01 2.70e-01 3.08e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.970    0.109    -      -           4.93e-03 3.19e-04   62.254 57
CPL   1.526    0.456      48.7   38.7      8.55e-03 5.18e-03   59.130  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.018    0.251    -      -           1.26e-02 2.18e-03   60.332 57
CPL   1.230    1.127      42.6 5000.0      3.51e-02 9.11e-02   58.573 56
 
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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   47.660  -41.796    5.864
T90    43.512  -39.940    3.572
T50    14.468  -32.480  -18.012
Peak    1.000  -24.864  -23.864

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   40.7097 +30.3663 0.0247   35.3  152.2       0.3668     7.8  TRIG_00228316       
------------------------------------------
 
Foreground time interval of the image:
 -6.699   5.864 (delta_t =  12.563 [sec])
Background time interval of the image:

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  -41.796 sec. to    5.864 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.96994     ( -0.108267   0.110482 )
Norm@50keV  : 4.931823E-03    ( -3.207475E-04   3.169803E-04) )
------------------------------------------------------------
 Chi-Squared =      62.25437     using    59 PHA bins.
 Reduced chi-squared =      1.092182     for     57 degrees of freedom
 Null hypothesis probability = 0.295
 
Photon flux (15-150 keV)    in 47.66 sec: 0.729734 ( -0.043583  0.043694 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.16462e-06 ( -1.35412e-07  1.36217e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -41.796 sec. to    5.864 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.52640     ( -0.482679   0.429490 )
Epeak [keV] : 48.6788      ( -13.2978 64.1065 )
Norm@50keV  : 8.552251E-03    ( -3.457373E-03   6.904133E-03) )
------------------------------------------------------------
 Chi-Squared =      59.12956     using    59 PHA bins.
 but latest trial   23.9367     gives Chi-Squared =   3.30610
 Reduced chi-squared =      1.055885     for     56 degrees of freedom
 Null hypothesis probability = 0.362
 
Photon flux (15-150 keV)    in 47.66 sec: 0.712580 ( -0.046539  0.046457 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.08477e-06 ( -1.56797e-07  1.56625e-07 ) ergs/cm2
 
Band function
Time interval is from  -41.796 sec. to    5.864 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.52563   ( -0.430307   0.478122 )
beta        : -8.57840    ( -1.42160   6.64902 )
Epeak [keV] : 48.6462      ( -18.3735 64.1274 )
Norm@50keV   : 8.559971E-03    ( -3.470650E-03   6.896227E-03) )
------------------------------------------------------------
 Chi-Squared =      59.12952     using    59 PHA bins.
 Reduced chi-squared =      1.075082     for     55 degrees of freedom
 Null hypothesis probability = 0.327
 
Photon flux (15-150 keV)    in 47.66 sec: 0.712563 ( -0.04654  0.046585 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.09505e-06 ( -1.52388e-07  1.59556e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  -24.864 sec. to  -23.864 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.01783     ( -0.240840   0.261344 )
Norm@50keV  : 1.257896E-02    ( -2.211977E-03   2.142359E-03) )
------------------------------------------------------------
 Chi-Squared =      60.33154     using    59 PHA bins.
 Reduced chi-squared =      1.058448     for     57 degrees of freedom
 Null hypothesis probability = 0.356
 
Photon flux (15-150 keV)    in 1.000 sec: 1.90249 ( -0.26702  0.2671 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16116e-07 ( -1.89024e-08  1.9232e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -24.864 sec. to  -23.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.23031     ( -1.25918   0.995777 )
Epeak [keV] : 42.6109      ( -42.6009 9957.39 )
Norm@50keV  : 3.514904E-02    ( -3.514905E-02   0.147131 )
------------------------------------------------------------
 Chi-Squared =      58.57280     using    59 PHA bins.
 Reduced chi-squared =      1.045943     for     56 degrees of freedom
 Null hypothesis probability = 0.381
 
Photon flux (15-150 keV)    in 1.000 sec: 1.86993 ( -0.27113  0.27037 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10617e-07 ( -1.97334e-08  2.0495e-08 ) ergs/cm2
 
Band function
Time interval is from  -24.864 sec. to  -23.864 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.23481   ( -8.76519   1.29591 )
beta        : -9.02453    ( -0.975470   7.15085 )
Epeak [keV] : 42.6392      ( -17.3120 9957.36 )
Norm@50keV   : 3.491952E-02    ( -3.491952E-02   0.147467 )
------------------------------------------------------------
 Chi-Squared =      58.57290     using    59 PHA bins.
 Reduced chi-squared =      1.064962     for     55 degrees of freedom
 Null hypothesis probability = 0.346
 
Photon flux (15-150 keV)    in 1.000 sec: 1.87159 ( -0.27231  0.26778 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10825e-07 ( -1.99945e-08  2.0005e-08 ) ergs/cm2
 
Plot creation:
Wed Jan  2 03:45:49 EST 2008