batgrbproduct Analysis for Trigger=331856

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Fri Oct 17 09:53:37 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger331856/GCN5_download_cron
======================================================================

  Trigger: 00331856      Segment: 000

  BAT Trigger Time: 245879237.696   [s; MET]
      Trigger Stop: 245879239.744   [s; MET]
               UTC: 2008-10-16T19:47:14.515960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 14.6151239564649   Dec: -43.5430521619781  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.48
     Image Trigger?:     NO
     Rate S/N Ratio:     19.6977156035922  [ if not an image trigger ]
     Image S/N Ratio:    7.48

  Flight Position:   [ source = BAT ]
    RA: 14.6151239564649   Dec: -43.5430521619781  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 14.5823675398395   Dec: -43.5355403199613  [deg; J2000]  
        { 00h 58m 19.8s , -43d 32' 07.9" }
         +/- 2.27373171756348 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.01089950125502 [arcmin] (formal 1-sigma fit error)
    SNR: 9.40786166388258
 
  Angular difference between Flight and Ground position is 1.494304 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 2.64400002360344 +/- 0.793745547045134
        Measured from: 0.180000066757202
                   to: 2.82400009036064     [s; relative to TRIGTIME]
     T50: 0.936000019311905 +/- 0.329611881397209
        Measured from: 0.772000074386597
                   to: 1.7080000936985     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.503999978303909     
                   to: 1.50399997830391     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0200000107288361     
                   to: 2.95600000023842     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.020883   0.044054   0.048688   0.028531
           0.007801   0.008063   0.007267   0.006375 [error]
 Peak      0.010278   0.016430   0.028294   0.016338
           0.004554   0.004748   0.004411   0.003867 [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 6.69e-09 1.74e-08 3.68e-08 2.00e-07 9.92e-08 2.64e-07   erg/cm2
              Error 2.51e-09 3.89e-09 6.81e-09 9.08e-08 1.82e-08 9.33e-08   erg/cm2
Peak flux Power-law 8.09e-02 1.37e-01 1.76e-01 4.54e-01 5.18e-01 8.47e-01   ph/cm2/s
              Error 4.12e-02 4.20e-02 3.36e-02 2.09e-01 1.06e-01 2.03e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.60e-09 1.75e-08 3.69e-08 1.99e-07 9.93e-08 1.95e-07   erg/cm2
              Error 2.72e-09 3.90e-09 6.82e-09 9.02e-08 1.82e-08 0.00e+00   erg/cm2
Peak flux Cutoff-PL 8.07e-02 1.37e-01 1.76e-01 4.51e-01 5.18e-01 8.44e-01   ph/cm2/s
              Error 4.12e-02 4.20e-02 3.36e-02 2.08e-01 1.06e-01 2.02e-01   ph/cm2/s
 
Fluence        Band 6.05e-09 1.78e-08 3.73e-08 1.82e-07 9.81e-08 2.41e-07   erg/cm2
              Error 3.96e-09 4.66e-09 7.37e-09 9.90e-08 1.78e-08 1.25e-07   erg/cm2
Peak flux      Band 8.12e-02 1.37e-01 1.76e-01 4.51e-01 5.18e-01 8.02e-01   ph/cm2/s
              Error 4.26e-02 4.21e-02 3.37e-02 2.08e-01 8.08e-02 2.94e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.921    0.320    -      -           2.99e-03 5.31e-04   42.000 57
CPL   0.915    0.323    9999.2 5000.0      3.01e-03 5.32e-04   42.000 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.639    0.391    -      -           4.46e-03 1.00e-03   46.493 57
CPL   0.630    0.395    9995.4 4887.7      4.49e-03 1.00e-03   46.494 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: 1.344000 sec.
T50 in the 50-300 keV band: 0.704000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    2.976   -0.020    2.956
T90     2.644    0.180    2.824
T50     0.936    0.772    1.708
Peak    1.000    0.504    1.504

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   14.5824 -43.5355 0.0205   17.3   13.0       0.1486     9.4  TRIG_00331856       
------------------------------------------
 
Foreground time interval of the image:
 -0.020   2.956 (delta_t =   2.976 [sec])
Background time interval of the image:
-239.696  -0.020 (delta_t = 239.676 [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   -0.020 sec. to    2.956 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.920882     ( -0.332600   0.308279 )
Norm@50keV  : 2.994476E-03    ( -5.349515E-04   5.260655E-04) )
------------------------------------------------------------
 Chi-Squared =      41.99952     using    59 PHA bins.
 Reduced chi-squared =     0.7368336     for     57 degrees of freedom
 Null hypothesis probability = 0.932
 
Photon flux (15-150 keV)    in 2.976 sec: 0.343791 ( -0.061114  0.061566 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.91922e-08 ( -1.81232e-08  1.832e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.020 sec. to    2.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.914635     ( -0.335304   0.310410 )
Epeak [keV] : 9999.21      ( -9999.20 0.787109 )
Norm@50keV  : 3.013866E-03    ( -5.365531E-04   5.281542E-04) )
------------------------------------------------------------
 Chi-Squared =      42.00020     using    59 PHA bins.
 Reduced chi-squared =     0.7500035     for     56 degrees of freedom
 Null hypothesis probability = 0.917
 
Photon flux (15-150 keV)    in 2.976 sec: 0.343692 ( -0.061097  0.061429 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.92561e-08 ( -1.81685e-08  1.82923e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.020 sec. to    2.956 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.819511   ( -9.18049   5.81951 )
beta        : -0.920882    ( -0.308256   0.332601 )
Epeak [keV] : 34.7138      ( -34.6138 9965.29 )
Norm@50keV   : 4.410485E-03    ( -1.927503E-03   1346.08 )
------------------------------------------------------------
 Chi-Squared =      41.99952     using    59 PHA bins.
 Reduced chi-squared =     0.7636275     for     55 degrees of freedom
 Null hypothesis probability = 0.901
 
Photon flux (15-150 keV)    in 2.976 sec: 0.340170 ( -0.06552  0.061649 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.80785e-08 ( -1.7748e-08  1.78997e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.504 sec. to    1.504 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.638624     ( -0.414709   0.367812 )
Norm@50keV  : 4.456746E-03    ( -1.029480E-03   9.734989E-04) )
------------------------------------------------------------
 Chi-Squared =      46.49325     using    59 PHA bins.
 Reduced chi-squared =     0.8156711     for     57 degrees of freedom
 Null hypothesis probability = 0.839
 
Photon flux (15-150 keV)    in 1.000 sec: 0.518073 ( -0.10551  0.106653 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.59567e-08 ( -1.11801e-08  1.12529e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.504 sec. to    1.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.629598     ( -0.418742   0.370920 )
Epeak [keV] : 9995.41      ( -9770.85 4.58691 )
Norm@50keV  : 4.487553E-03    ( -1.028168E-03   9.817118E-04) )
------------------------------------------------------------
 Chi-Squared =      46.49386     using    59 PHA bins.
 Reduced chi-squared =     0.8302475     for     56 degrees of freedom
 Null hypothesis probability = 0.813
 
Photon flux (15-150 keV)    in 1.000 sec: 0.517912 ( -0.105467  0.106607 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.60086e-08 ( -1.12148e-08  1.1218e-08 ) ergs/cm2
 
Band function
Time interval is from    0.504 sec. to    1.504 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.927876   ( -9.07212   5.92788 )
beta        : -0.638628    ( -0.367789   0.414713 )
Epeak [keV] : 13.1243      ( -13.0243 9986.88 )
Norm@50keV   : 6.656977E-03    ( -3.190425E-03   83252.7 )
------------------------------------------------------------
 Chi-Squared =      46.49325     using    59 PHA bins.
 Reduced chi-squared =     0.8453318     for     55 degrees of freedom
 Null hypothesis probability = 0.786
 
Photon flux (15-150 keV)    in 1.000 sec: 0.517911 ( -0.054938  0.106621 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.59324e-08 ( -1.15203e-08  1.12583e-08 ) ergs/cm2
 
Plot creation:
Fri Oct 17 10:19:16 EDT 2008