batgrbproduct Analysis for Trigger=315615

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Tue Jul  1 20:56:31 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger315615/GCN5_download_cron
======================================================================

  Trigger: 00315615      Segment: 000

  BAT Trigger Time: 236600020.544   [s; MET]
      Trigger Stop: 236600021.568   [s; MET]
               UTC: 2008-07-01T10:13:37.636600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 45.8375449298875   Dec: 75.4918923999807  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    16.1
     Image Trigger?:     NO
     Rate S/N Ratio:     26.153393661244  [ if not an image trigger ]
     Image S/N Ratio:    16.1

  Flight Position:   [ source = BAT ]
    RA: 45.8375449298875   Dec: 75.4918923999807  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 45.9404560988669   Dec: 75.4776178954597  [deg; J2000]  
        { 03h 03m 45.7s , +75d 28' 39.4" }
         +/- 1.37605332254784 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.446612994829778 [arcmin] (formal 1-sigma fit error)
    SNR: 19.2782675768269
 
  Angular difference between Flight and Ground position is 1.768790 arcmin
 
  Partial Coding Fraction: 0.5546875    [ including projection effects ]

  Duration
     T90: 17.66400000453 +/- 9.11522680546778
        Measured from: -2.10400000214577
                   to: 15.5600000023842     [s; relative to TRIGTIME]
     T50: 4.48000001907349 +/- 1.19561867603917
        Measured from: -0.631999999284744
                   to: 3.84800001978874     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0760000050067902     
                   to: 0.92399999499321     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.74399998784065     
                   to: 24.5839999914169     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.570225   0.552702   0.228216   0.036348
           0.036892   0.036855   0.033805   0.032139 [error]
 Peak      0.100355   0.099370   0.035642   0.009148
           0.008340   0.008211   0.007054   0.006199 [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 1.93e-07 2.26e-07 1.91e-07 2.73e-07 7.08e-07 8.87e-07   erg/cm2
              Error 2.13e-08 1.87e-08 3.08e-08 8.57e-08 6.90e-08 1.22e-07   erg/cm2
Peak flux Power-law 1.15e+00 7.20e-01 2.91e-01 1.59e-01 2.24e+00 2.32e+00   ph/cm2/s
              Error 1.47e-01 7.39e-02 5.53e-02 5.49e-02 2.20e-01 2.29e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.85e-07 2.40e-07 1.80e-07 9.78e-08 6.64e-07 7.04e-07   erg/cm2
              Error 2.37e-08 2.45e-08 3.66e-08 1.35e-07 8.06e-08 1.69e-07   erg/cm2
Peak flux Cutoff-PL 1.04e+00 8.42e-01 2.46e-01 2.15e-02 2.15e+00 2.15e+00   ph/cm2/s
              Error 1.65e-01 1.03e-01 7.24e-02 3.14e-02 2.22e-01 1.69e-01   ph/cm2/s
 
Fluence        Band 1.83e-07 2.39e-07 1.79e-07 9.79e-08 6.63e-07 7.02e-07   erg/cm2
              Error 2.34e-08 2.44e-08 3.65e-08 1.28e-07 8.05e-08 1.69e-07   erg/cm2
Peak flux      Band 1.04e+00 8.43e-01 2.45e-01 2.68e-02 2.15e+00 2.14e+00   ph/cm2/s
              Error 1.61e-01 5.14e-02 3.43e-02 4.75e-02 2.16e-01 2.10e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.243    0.170    -      -           2.74e-03 3.16e-04   43.328 57
CPL   1.670    0.549      22.6   17.6      6.01e-03 6.90e-03   41.052  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.305    0.194    -      -           1.28e-02 1.84e-03   68.848 57
CPL   0.758    1.022      29.6    9.2      1.16e-01 2.96e-01   59.823 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: 3.584000 sec.
T50 in the 50-300 keV band: 2.048000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   27.328   -2.744   24.584
T90    17.664   -2.104   15.560
T50     4.480   -0.632    3.848
Peak    1.000   -0.076    0.924

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   45.9405 +75.4776 0.0100   27.1  -68.0       1.4144    19.3  TRIG_00315615       
------------------------------------------
 
Foreground time interval of the image:
 -2.744  24.584 (delta_t =  27.328 [sec])
Background time interval of the image:
-239.544  -2.744 (delta_t = 236.800 [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   -2.744 sec. to   24.584 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.24292     ( -0.164938   0.174090 )
Norm@50keV  : 2.736915E-03    ( -3.181105E-04   3.132732E-04) )
------------------------------------------------------------
 Chi-Squared =      43.32780     using    59 PHA bins.
 Reduced chi-squared =     0.7601368     for     57 degrees of freedom
 Null hypothesis probability = 0.909
 
Photon flux (15-150 keV)    in 27.33 sec: 0.463580 ( -0.036751  0.036762 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.07811e-07 ( -6.81528e-08  6.97981e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -2.744 sec. to   24.584 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.66954     ( -0.764305   0.333135 )
Epeak [keV] : 22.5963      ( -21.7857 13.4572 )
Norm@50keV  : 6.007569E-03    ( -2.640091E-03   1.115381E-02) )
------------------------------------------------------------
 Chi-Squared =      41.05194     using    59 PHA bins.
 but latest trial   2.00267     gives Chi-Squared =   8.10708
 Reduced chi-squared =     0.7330704     for     56 degrees of freedom
 Null hypothesis probability = 0.933
 
Photon flux (15-150 keV)    in 27.33 sec: 0.451247 ( -0.038981  0.019568 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.64428e-07 ( -7.77429e-08  8.3403e-08 ) ergs/cm2
 
Band function
Time interval is from   -2.744 sec. to   24.584 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.67374   ( -8.32626   0.379812 )
beta        : -8.98947    ( -1.01053   6.81582 )
Epeak [keV] : 22.5188      ( -22.4188 13.5239 )
Norm@50keV   : 5.964989E-03    ( -2.430074E-03   1.119126E-02) )
------------------------------------------------------------
 Chi-Squared =      41.05239     using    59 PHA bins.
 Reduced chi-squared =     0.7464070     for     55 degrees of freedom
 Null hypothesis probability = 0.919
 
Photon flux (15-150 keV)    in 27.33 sec: 0.451275 ( -0.039009  0.039033 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.63455e-07 ( -7.77866e-08  8.32198e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.056 sec. to    0.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.30531     ( -0.187495   0.200458 )
Norm@50keV  : 1.276739E-02    ( -1.854684E-03   1.833016E-03) )
------------------------------------------------------------
 Chi-Squared =      68.84841     using    59 PHA bins.
 Reduced chi-squared =      1.207867     for     57 degrees of freedom
 Null hypothesis probability = 0.135
 
Photon flux (15-150 keV)    in 0.9600 sec: 2.23782 ( -0.22033  0.22034 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17167e-07 ( -1.38893e-08  1.43952e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.056 sec. to    0.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.758487     ( -1.11733   0.926059 )
Epeak [keV] : 29.6462      ( -12.2052 6.16990 )
Norm@50keV  : 0.116032    ( -0.116032   0.476403 )
------------------------------------------------------------
 Chi-Squared =      59.82298     using    59 PHA bins.
 Reduced chi-squared =      1.068267     for     56 degrees of freedom
 Null hypothesis probability = 0.339
 
Photon flux (15-150 keV)    in 0.9600 sec: 2.14922 ( -0.22142  0.2226 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03588e-07 ( -1.32232e-08  1.46362e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.056 sec. to    0.904 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.959655   ( -0.740510   1.01138 )
beta        : -9.36466    ( -0.635340   6.71904 )
Epeak [keV] : 28.7869      ( -14.9407 7.28179 )
Norm@50keV   : 8.699273E-02    ( -1.765837E-02   0.222761 )
------------------------------------------------------------
 Chi-Squared =      59.94207     using    59 PHA bins.
 Reduced chi-squared =      1.089856     for     55 degrees of freedom
 Null hypothesis probability = 0.301
 
Photon flux (15-150 keV)    in 0.9600 sec: 2.15182 ( -0.22115  0.21067 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.0478e-07 ( -1.31511e-08  1.30435e-08 ) ergs/cm2
 
Plot creation:
Tue Jul  1 21:30:52 EDT 2008