batgrbproduct Analysis for Trigger=331332

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sat Oct 11 12:02:05 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger331332/GCN5_download_cron
======================================================================

  Trigger: 00331332      Segment: 000

  BAT Trigger Time: 245377733.632   [s; MET]
      Trigger Stop: 245377737.728   [s; MET]
               UTC: 2008-10-11T00:28:50.466880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 220.360725648565   Dec: 33.6074738964866  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.49
     Image Trigger?:     NO
     Rate S/N Ratio:     10.9087121146357  [ if not an image trigger ]
     Image S/N Ratio:    7.49

  Flight Position:   [ source = BAT ]
    RA: 220.360725648565   Dec: 33.6074738964866  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 220.363270796738   Dec: 33.5483477683147  [deg; J2000]  
        { 14h 41m 27.2s , +33d 32' 54.1" }
         +/- 2.26838649576108 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.00650263585072 [arcmin] (formal 1-sigma fit error)
    SNR: 9.43954717381493
 
  Angular difference between Flight and Ground position is 3.549848 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 9.05200001597404 +/- 2.38752844770979
        Measured from: -0.283999919891357
                   to: 8.76800009608269     [s; relative to TRIGTIME]
     T50: 3.91600000858307 +/- 1.59996500118899
        Measured from: 1.78400009870529
                   to: 5.70000010728836     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.06000000238419     
                   to: 2.06000000238419     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.912000000476837     
                   to: 8.96000000834465     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.060394   0.112552   0.077386  -0.007014
           0.014007   0.014294   0.013022   0.011847 [error]
 Peak      0.014681   0.013610   0.019991   0.002850
           0.004502   0.004633   0.004116   0.003891 [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 2.00e-08 3.76e-08 5.46e-08 1.69e-07 1.55e-07 2.88e-07   erg/cm2
              Error 5.09e-09 6.11e-09 1.22e-08 7.99e-08 2.97e-08 9.08e-08   erg/cm2
Peak flux Power-law 8.36e-02 1.16e-01 1.18e-01 2.20e-01 3.88e-01 5.38e-01   ph/cm2/s
              Error 4.63e-02 3.83e-02 3.26e-02 1.45e-01 1.01e-01 1.56e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.82e-08 4.08e-08 5.57e-08 5.85e-08 1.45e-07 1.74e-07   erg/cm2
              Error 5.78e-09 6.13e-09 1.38e-08 1.06e-07 3.32e-08 1.18e-07   erg/cm2
Peak flux Cutoff-PL 8.35e-02 1.16e-01 1.18e-01 2.19e-01 3.88e-01 5.23e-01   ph/cm2/s
              Error 4.63e-02 3.83e-02 3.26e-02 1.44e-01 1.01e-01 1.56e-01   ph/cm2/s
 
Fluence        Band 1.80e-08 4.16e-08 5.31e-08 1.25e-07 1.49e-07 2.42e-07   erg/cm2
              Error 5.54e-09 8.23e-09 1.42e-08 1.11e-07 3.24e-08 1.15e-07   erg/cm2
Peak flux      Band 8.17e-02 1.15e-01 1.18e-01 2.21e-01 3.89e-01 5.33e-01   ph/cm2/s
              Error 2.83e-02 3.04e-02 3.03e-02 6.58e-02 9.77e-02 1.33e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.462    0.278    -      -           1.64e-03 2.79e-04   62.491 57
CPL   0.754    1.139      82.4 4975.8      3.92e-03 1.06e-02   61.221  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.969    0.493    -      -           3.37e-03 8.65e-04   60.581 57
CPL   0.857    0.000     552.9    0.0      3.74e-03 8.69e-04   60.643 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    9.872   -0.912    8.960
T90     9.052   -0.284    8.768
T50     3.916    1.784    5.700
Peak    1.000    1.060    2.060

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  220.3633 +33.5483 0.0204    7.8 -132.8       0.2648     9.4  TRIG_00331332       
------------------------------------------
 
Foreground time interval of the image:
 -0.912   8.960 (delta_t =   9.872 [sec])
Background time interval of the image:
-148.131  -0.912 (delta_t = 147.219 [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   -0.912 sec. to    8.960 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.46168     ( -0.274523   0.281610 )
Norm@50keV  : 1.644857E-03    ( -2.808966E-04   2.766864E-04) )
------------------------------------------------------------
 Chi-Squared =      62.49105     using    59 PHA bins.
 Reduced chi-squared =      1.096334     for     57 degrees of freedom
 Null hypothesis probability = 0.288
 
Photon flux (15-150 keV)    in 9.872 sec: 0.203301 ( -0.032446  0.032456 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.55037e-07 ( -2.92438e-08  3.00829e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.912 sec. to    8.960 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.753862     ( -1.36762   0.909751 )
Epeak [keV] : 82.4233      ( -33.9417 9917.58 )
Norm@50keV  : 3.919508E-03    ( -3.919508E-03   1.725575E-02) )
------------------------------------------------------------
 Chi-Squared =      61.22140     using    59 PHA bins.
 but latest trial   37.9200     gives Chi-Squared =   10.4500
 Reduced chi-squared =      1.093239     for     56 degrees of freedom
 Null hypothesis probability = 0.294
 
Photon flux (15-150 keV)    in 9.872 sec: 0.197431 ( -0.033562  0.033597 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.44606e-07 ( -3.25964e-08  3.38501e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.912 sec. to    8.960 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.757118   ( -9.24288   1.21716 )
beta        : -9.15470    ( -8.26586   0.433781 )
Epeak [keV] : 82.5601      ( -47.8470 476.137 )
Norm@50keV   : 3.904055E-03    ( -0.805781   19.8477 )
------------------------------------------------------------
 Chi-Squared =      61.22132     using    59 PHA bins.
 Reduced chi-squared =      1.113115     for     55 degrees of freedom
 Null hypothesis probability = 0.263
 
Photon flux (15-150 keV)    in 9.872 sec: 0.197417 ( -0.033544  0.033618 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.49092e-07 ( -3.31916e-08  3.15608e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    1.060 sec. to    2.060 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.969044     ( -0.516828   0.469682 )
Norm@50keV  : 3.373569E-03    ( -8.723391E-04   8.571437E-04) )
------------------------------------------------------------
 Chi-Squared =      60.58128     using    59 PHA bins.
 Reduced chi-squared =      1.062829     for     57 degrees of freedom
 Null hypothesis probability = 0.348
 
Photon flux (15-150 keV)    in 1.000 sec: 0.387863 ( -0.100388  0.101163 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.68911e-08 ( -1.01588e-08  1.03485e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.060 sec. to    2.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.856681     (     )
Epeak [keV] : 552.925      (   )
Norm@50keV  : 3.743931E-03    ( -8.593032E-04   8.783389E-04) )
------------------------------------------------------------
 Chi-Squared =      60.64340     using    59 PHA bins.
 Reduced chi-squared =      1.082918     for     56 degrees of freedom
 Null hypothesis probability = 0.312
 
Photon flux (15-150 keV)    in 1.000 sec: 0.387712 ( -0.100339  0.101138 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.69139e-08 ( -1.01789e-08  1.03387e-08 ) ergs/cm2
 
Band function
Time interval is from    1.060 sec. to    2.060 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.850883   ( -9.14912   5.85088 )
beta        : -0.969048    ( -9.03095   0.516839 )
Epeak [keV] : 37.4642      ( -37.3642 9962.54 )
Norm@50keV   : 5.139756E-03    ( -5.139756E-03   205.457 )
------------------------------------------------------------
 Chi-Squared =      60.58128     using    59 PHA bins.
 Reduced chi-squared =      1.101478     for     55 degrees of freedom
 Null hypothesis probability = 0.282
 
Photon flux (15-150 keV)    in 1.000 sec: 0.388795 ( -0.097016  0.098454 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.69708e-08 ( -1.0148e-08  1.0367e-08 ) ergs/cm2
 
Plot creation:
Sat Oct 11 12:32:12 EDT 2008