batgrbproduct Analysis for Trigger=312958

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Jun  2 10:11:59 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger312958/SDC
======================================================================

  Trigger: 00312958      Segment: 000

  BAT Trigger Time: 234063030.912   [s; MET]
      Trigger Stop: 234063032.96   [s; MET]
               UTC: 2008-06-02T01:30:28.077080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 19.1726774847547   Dec: -9.25077306570324  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.11
     Image Trigger?:     NO
     Rate S/N Ratio:     13.3790881602597  [ if not an image trigger ]
     Image S/N Ratio:    8.11

  Flight Position:   [ source = BAT ]
    RA: 19.1726774847547   Dec: -9.25077306570324  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 19.1773149963115   Dec: -9.23883402557759  [deg; J2000]  
        { 01h 16m 42.6s , -09d 14' 19.8" }
         +/- 1.7325011366993 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.761414681550076 [arcmin] (formal 1-sigma fit error)
    SNR: 13.8725467423614
 
  Angular difference between Flight and Ground position is 0.767184 arcmin
 
  Partial Coding Fraction: 0.1972656    [ including projection effects ]

  Duration
     T90: 74.2680000066757 +/- 7.15611626957373
        Measured from: -9.78000000119209
                   to: 64.4880000054836     [s; relative to TRIGTIME]
     T50: 58.9760000109673 +/- 1.19500291774825
        Measured from: 1.20800000429153
                   to: 60.1840000152588     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 59.5959999859333     
                   to: 60.5959999859333     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.4880000054836     
                   to: 69.3079999983311     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.980287   1.521488   1.550791   0.356908
           0.105653   0.108770   0.104316   0.100131 [error]
 Peak      0.037419   0.116626   0.148466   0.053289
           0.007606   0.008549   0.009189   0.007835 [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 4.01e-07 7.68e-07 1.14e-06 3.65e-06 3.22e-06 5.94e-06   erg/cm2
              Error 5.66e-08 6.49e-08 9.80e-08 6.98e-07 2.46e-07 7.54e-07   erg/cm2
Peak flux Power-law 6.25e-01 8.71e-01 8.98e-01 1.69e+00 2.93e+00 4.09e+00   ph/cm2/s
              Error 1.06e-01 9.13e-02 6.72e-02 2.69e-01 2.38e-01 3.13e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.53e-07 7.96e-07 1.21e-06 2.01e-06 3.16e-06 4.37e-06   erg/cm2
              Error 7.24e-08 7.34e-08 1.22e-07 1.26e-06 2.57e-07 1.25e-06   erg/cm2
Peak flux Cutoff-PL 5.36e-01 8.90e-01 9.69e-01 1.10e+00 2.89e+00 3.50e+00   ph/cm2/s
              Error 1.33e-01 9.87e-02 9.81e-02 4.95e-01 2.39e-01 5.46e-01   ph/cm2/s
 
Fluence        Band 3.50e-07 7.93e-07 1.21e-06 2.03e-06 3.16e-06 4.38e-06   erg/cm2
              Error 7.17e-08 7.32e-08 1.22e-07 8.45e-07 2.57e-07 8.92e-07   erg/cm2
Peak flux      Band 4.48e-01 9.47e-01 9.40e-01 1.42e+00 2.83e+00 3.76e+00   ph/cm2/s
              Error 1.70e-01 1.12e-01 9.57e-02 3.73e-01 2.44e-01 4.21e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.429    0.128    -      -           4.14e-03 3.02e-04   50.093 57
CPL   0.910    0.567     119.0 3764.7      7.12e-03 4.45e-03   47.330  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.956    0.129    -      -           2.55e-02 2.03e-03   58.475 57
CPL   0.425    0.574     182.0 4942.4      4.28e-02 2.51e-02   55.746  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: 72.896000 sec.
T50 in the 50-300 keV band: 59.200000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   80.796  -11.488   69.308
T90    74.268   -9.780   64.488
T50    58.976    1.208   60.184
Peak    1.000   59.596   60.596

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   19.1773  -9.2388 0.0139   51.3   -0.8       2.7358    13.9  TRIG_00312958       
------------------------------------------
 
Foreground time interval of the image:
-11.488  33.293 (delta_t =  44.781 [sec])
Background time interval of the image:
-276.707 -11.488 (delta_t = 265.219 [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  -11.488 sec. to   69.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.42911     ( -0.128441   0.128080 )
Norm@50keV  : 4.143935E-03    ( -3.017907E-04   3.017797E-04) )
------------------------------------------------------------
 Chi-Squared =      50.09345     using    59 PHA bins.
 Reduced chi-squared =     0.8788325     for     57 degrees of freedom
 Null hypothesis probability = 0.730
 
Photon flux (15-150 keV)    in 80.80 sec: 0.508091 ( -0.040348  0.04054 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.21703e-06 ( -2.45252e-07  2.45907e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -11.488 sec. to   69.308 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.909818     ( -0.606450   0.527583 )
Epeak [keV] : 119.021      ( -36.3732 7493.01 )
Norm@50keV  : 7.120116E-03    ( -2.932764E-03   5.972967E-03) )
------------------------------------------------------------
 Chi-Squared =      47.33049     using    59 PHA bins.
 but latest trial  4.178043E-03 gives Chi-Squared =   2.75431
 Reduced chi-squared =     0.8451873     for     56 degrees of freedom
 Null hypothesis probability = 0.789
 
Photon flux (15-150 keV)    in 80.80 sec: 0.494903 ( -0.042481  0.042527 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.15925e-06 ( -2.56984e-07  2.573e-07 ) ergs/cm2
 
Band function
Time interval is from  -11.488 sec. to   69.308 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.877329   ( -0.561185   0.575347 )
beta        : -8.63633    ( -1.36367   7.21746 )
Epeak [keV] : 115.225      ( -32.6228 9737.21 )
Norm@50keV   : 7.360399E-03    ( -3.224001E-03   5.757923E-03) )
------------------------------------------------------------
 Chi-Squared =      47.34118     using    59 PHA bins.
 Reduced chi-squared =     0.8607487     for     55 degrees of freedom
 Null hypothesis probability = 0.759
 
Photon flux (15-150 keV)    in 80.80 sec: 0.494898 ( -0.042486  0.042672 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.1583e-06 ( -2.58075e-07  2.55756e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   59.596 sec. to   60.596 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.955549     ( -0.131307   0.126900 )
Norm@50keV  : 2.551152E-02    ( -2.040124E-03   2.018383E-03) )
------------------------------------------------------------
 Chi-Squared =      58.47540     using    59 PHA bins.
 Reduced chi-squared =      1.025884     for     57 degrees of freedom
 Null hypothesis probability = 0.421
 
Photon flux (15-150 keV)    in 1.000 sec: 2.93152 ( -0.23754  0.23843 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.80341e-07 ( -2.111e-08  2.114e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   59.596 sec. to   60.596 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 0.425274     ( -0.619909   0.528563 )
Epeak [keV] : 181.998      ( -66.8639 9818.00 )
Norm@50keV  : 4.275346E-02    ( -1.655767E-02   3.367895E-02) )
------------------------------------------------------------
 Chi-Squared =      55.74582     using    59 PHA bins.
 but latest trial  0.953883     gives Chi-Squared =   2.53842
 but latest trial  2.631187E-02 gives Chi-Squared =   3.51888
 Reduced chi-squared =     0.9954610     for     56 degrees of freedom
 Null hypothesis probability = 0.484
 
Photon flux (15-150 keV)    in 1.000 sec: 2.89495 ( -0.23852  0.24027 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.78927e-07 ( -2.1844e-08  2.1608e-08 ) ergs/cm2
 
Band function
Time interval is from   59.596 sec. to   60.596 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.887128   ( -3.82706   1.61132 )
beta        : -1.19674    ( -0.176063   0.169073 )
Epeak [keV] : 68.9981      ( -12.6935 127.865 )
Norm@50keV   : 0.237952    ( -11.6064   66.1433 )
------------------------------------------------------------
 Chi-Squared =      52.88729     using    59 PHA bins.
 Reduced chi-squared =     0.9615872     for     55 degrees of freedom
 Null hypothesis probability = 0.556
 
Photon flux (15-150 keV)    in 1.000 sec: 2.83292 ( -0.24545  0.24189 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.7561e-07 ( -2.1711e-08  2.1244e-08 ) ergs/cm2
 
Plot creation:
Mon Jun  2 10:42:46 EDT 2008