batgrbproduct Analysis for Trigger=331721

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Oct 15 17:38:00 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger331721/GCN5_download_cron
======================================================================

  Trigger: 00331721      Segment: 000

  BAT Trigger Time: 245758464   [s; MET]
      Trigger Stop: 245758784   [s; MET]
               UTC: 2008-10-15T10:14:20.823560    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 79.0501924680654   Dec: 17.297148501389  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.82
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.82

  Flight Position:   [ source = BAT ]
    RA: 79.0501924680654   Dec: 17.297148501389  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA:    Dec:   [deg; J2000]  
        { 00h 00m 00.0s , +00d 00' 00.0" }
         +/- inf [arcmin] (estimated 90% radius based on SNR)
         +/- 0 [arcmin] (formal 1-sigma fit error)
    SNR: 
 
  Angular difference between Flight and Ground position is 4773.065512 arcmin
 
  Partial Coding Fraction: 0.03369141    [ including projection effects ]

  Duration
     T90: 802.60799998045 +/- 68.1172241256339
        Measured from: 27.3520000874996
                   to: 829.960000067949     [s; relative to TRIGTIME]
     T50: 437.455999970436 +/- 69.1161665635242
        Measured from: 206.232000082731
                   to: 643.688000053167     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 315.467999994755     
                   to: 316.467999994755     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.4160000085831     
                   to: 888.055999994278     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    13.433864  10.925353   5.888112   1.967207
           0.553851   0.559324   0.496126   0.447828 [error]
 Peak      0.092787   0.082157   0.042963   0.052691
           0.026550   0.026824   0.026771   0.026321 [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 5.49e-06 5.90e-06 4.50e-06 5.60e-06 1.80e-05 2.15e-05   erg/cm2
              Error 5.22e-07 3.49e-07 5.23e-07 1.32e-06 1.15e-06 1.86e-06   erg/cm2
Peak flux Power-law 8.06e-01 4.11e-01 1.29e-01 5.19e-02 1.38e+00 1.40e+00   ph/cm2/s
              Error 5.47e-01 3.29e-01 1.59e-01 1.57e-01 7.52e-01 7.65e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.49e-06 5.90e-06 4.50e-06 5.56e-06 1.80e-05 2.15e-05   erg/cm2
              Error 5.22e-07 3.50e-07 5.24e-07 1.31e-06 1.15e-06 1.85e-06   erg/cm2
Peak flux Cutoff-PL 9.83e-01 4.15e-01 8.27e-03 7.94e-07 1.41e+00 1.41e+00   ph/cm2/s
              Error 5.82e-01 2.46e-01 1.24e-01 4.28e-02 7.13e-01 7.13e-01   ph/cm2/s
 
Fluence        Band 5.36e-06 5.88e-06 4.49e-06 5.61e-06 1.80e-05 2.06e-05   erg/cm2
              Error 4.63e-07 3.46e-07 4.48e-07 6.94e-07 1.07e-06 0.00e+00   erg/cm2
Peak flux      Band 8.51e-01 4.96e-01 5.21e-02 5.62e-03 1.41e+00 1.43e+00   ph/cm2/s
              Error 5.72e-01 3.80e-01 8.87e-02 8.65e-02 7.01e-01 7.31e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.391    0.136    -      -           2.06e-03 1.66e-04   53.418 57
CPL   1.991    0.000       1.0    8.7      3.27e-03 4.48e-04   56.228 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.669    1.384    -      -           6.29e-03 6.16e-03   71.936 57
CPL  -2.452    0.000      20.9    7.2      6.49e+01 5.15e+02   70.363  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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  899.472  -11.416  888.056
T90   802.608   27.352  829.960
T50   437.456  206.232  643.688
Peak    1.000  315.468  316.468

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
------------------------------------------
  --> command terminated with status 0
 
Foreground time interval of the image:
-11.416 335.001 (delta_t = 346.417 [sec])
Background time interval of the image:
-239.000 -11.416 (delta_t = 227.584 [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  -11.416 sec. to  888.056 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.39051     ( -0.132827   0.139655 )
Norm@50keV  : 2.056642E-03    ( -1.683109E-04   1.645228E-04) )
------------------------------------------------------------
 Chi-Squared =      53.41804     using    59 PHA bins.
 Reduced chi-squared =     0.9371586     for     57 degrees of freedom
 Null hypothesis probability = 0.610
 
Photon flux (15-150 keV)    in 899.5 sec: 0.378427 ( -0.023963  0.02411 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80095e-05 ( -1.151e-06  1.1546e-06 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -11.416 sec. to  888.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.99149     (     )
Epeak [keV] : 1.04066      ( -0.258620 17.1727 )
Norm@50keV  : 3.272096E-03    ( -4.169585E-04   4.798712E-04) )
------------------------------------------------------------
 Chi-Squared =      56.22751     using    59 PHA bins.
 Reduced chi-squared =      1.004063     for     56 degrees of freedom
 Null hypothesis probability = 0.466
 
Photon flux (15-150 keV)    in 899.5 sec: 0.378205 ( -0.023948  0.024097 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80066e-05 ( -1.14857e-06  1.15721e-06 ) ergs/cm2
 
Band function
Time interval is from  -11.416 sec. to  888.056 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.60767   ( -4.27449   10.7255 )
beta        : -2.37294    ( -0.139672   0.132839 )
Epeak [keV] : 10.6018      ( -10.5018 9989.40 )
Norm@50keV   : 8.787609E-03    ( -2.287489E-02   2.236232E-02) )
------------------------------------------------------------
 Chi-Squared =      53.98954     using    59 PHA bins.
 Reduced chi-squared =     0.9816279     for     55 degrees of freedom
 Null hypothesis probability = 0.513
 
Photon flux (15-150 keV)    in 899.5 sec: 0.378156 ( -0.022271  0.023012 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.79804e-05 ( -1.05871e-06  1.07994e-06 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  315.464 sec. to  316.472 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.66923     ( -1.19897   1.56915 )
Norm@50keV  : 6.289879E-03    ( -6.289879E-03   6.037009E-03) )
------------------------------------------------------------
 Chi-Squared =      71.93559     using    59 PHA bins.
 Reduced chi-squared =      1.262028     for     57 degrees of freedom
 Null hypothesis probability = 8.791E-02
 
Photon flux (15-150 keV)    in 1.008 sec: 1.37560 ( -0.752217  0.75263 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.67691e-08 ( -3.89759e-08  4.79141e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  315.464 sec. to  316.472 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.45161     (     )
Epeak [keV] : 20.8673      ( -5.80672 8.56354 )
Norm@50keV  : 64.9055    ( -147.360   882.648 )
------------------------------------------------------------
 Chi-Squared =      70.36284     using    59 PHA bins.
 but latest trial   14.6539     gives Chi-Squared =  0.473152
 Reduced chi-squared =      1.256479     for     56 degrees of freedom
 Null hypothesis probability = 9.380E-02
 
Photon flux (15-150 keV)    in 1.008 sec: 1.40694 ( -0.709914  0.71656 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.23679e-08 ( -2.6628e-08  2.68774e-08 ) ergs/cm2
 
Band function
Time interval is from  315.464 sec. to  316.472 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.48598   ( -8.51402   6.48598 )
beta        : -2.96803    ( -7.03197   6.32815 )
Epeak [keV] : 12.0870      ( -11.9870 9987.91 )
Norm@50keV   : 4.514547E-02    ( -2236.02   4431.08 )
------------------------------------------------------------
 Chi-Squared =      71.57084     using    59 PHA bins.
 Reduced chi-squared =      1.301288     for     55 degrees of freedom
 Null hypothesis probability = 6.596E-02
 
Photon flux (15-150 keV)    in 1.008 sec: 1.41470 ( -0.701511  0.70109 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.42763e-08 ( -3.85907e-08  4.50342e-08 ) ergs/cm2
 
Plot creation:
Wed Oct 15 18:01:07 EDT 2008