batgrbproduct Analysis for Trigger=312068

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed May 21 16:54:38 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger312068/GCN5_download_cron
======================================================================

  Trigger: 00312068      Segment: 000

  BAT Trigger Time: 233042624   [s; MET]
      Trigger Stop: 233042688   [s; MET]
               UTC: 2008-05-21T06:03:41.193860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 252.010523081687   Dec: -45.1573313426522  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.21
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.21

  Flight Position:   [ source = BAT ]
    RA: 252.010523081687   Dec: -45.1573313426522  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 252.089414340535   Dec: -45.1388786819742  [deg; J2000]  
        { 16h 48m 21.5s , -45d 08' 20.0" }
         +/- 3.34200626097183 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.49589240470592 [arcmin] (formal 1-sigma fit error)
    SNR: 5.42670959258709
 
  Angular difference between Flight and Ground position is 3.517212 arcmin
 
  Partial Coding Fraction: 0.703125    [ including projection effects ]

  Duration
     T90: 64 +/- 
        Measured from: 0
                   to: 64     [s; relative to TRIGTIME]
     T50: 64 +/- 
        Measured from: 0
                   to: 64     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 64 second)
        Measured from: 0     
                   to: 64     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 64     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.272532   0.235267   0.011627   0.030197
           0.050803   0.048687   0.042650   0.038626 [error]
 Peak      0.272532   0.235267   0.011627   0.030197
           0.050803   0.048687   0.042650   0.038626 [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 7.52e-08 8.47e-08 6.82e-08 9.15e-08 2.62e-07 3.19e-07   erg/cm2
              Error 2.27e-08 2.35e-08 3.55e-08 9.06e-08 8.42e-08 1.43e-07   erg/cm2
Peak flux Power-law 3.85e-02 2.41e-02 9.72e-03 5.29e-03 7.51e-02 7.77e-02   ph/cm2/s
              Error 1.19e-02 6.50e-03 4.89e-03 5.92e-03 1.87e-02 1.97e-02   ph/cm2/s
 
Fluence   Cutoff-PL 7.66e-08 1.01e-07 1.85e-08 1.52e-10 1.97e-07 1.96e-07   erg/cm2
              Error 2.58e-08 3.41e-08 4.09e-08 6.13e-08 7.33e-08 1.12e-07   erg/cm2
Peak flux Cutoff-PL 3.82e-02 2.97e-02 3.04e-03 1.36e-05 7.09e-02 7.09e-02   ph/cm2/s
              Error 1.34e-02 9.39e-03 5.86e-03 3.50e-03 1.78e-02 1.78e-02   ph/cm2/s
 
Fluence        Band 7.78e-08 9.34e-08 4.70e-08 1.21e-08 2.21e-07 2.53e-07   erg/cm2
              Error 2.88e-08 2.80e-08 6.93e-08 9.44e-08 1.13e-07 0.00e+00   erg/cm2
Peak flux      Band 3.74e-02 2.82e-02 6.53e-03 1.34e-03 7.41e-02 7.43e-02   ph/cm2/s
              Error 1.36e-02 7.92e-03 3.66e-03 2.83e-03 1.83e-02 1.88e-02   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.312    0.512    -      -           4.27e-04 1.65e-04   60.184 57
CPL  -0.740    2.912      26.5   17.9      5.93e-02 6.53e-01   57.821 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.312    0.512    -      -           4.27e-04 1.65e-04   60.184 57
CPL  -0.740    2.506      26.5   17.9      5.93e-02 6.53e-01   57.821  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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   64.000    0.000   64.000
T90    64.000    0.000   64.000
T50    64.000    0.000   64.000
Peak   64.000    0.000   64.000

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  252.0894 -45.1389 0.0356   20.3   64.1       0.5166     5.4  TRIG_00312068       
------------------------------------------
 
Foreground time interval of the image:
  0.000  64.000 (delta_t =  64.000 [sec])
Background time interval of the image:

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    0.000 sec. to   64.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.31175     ( -0.475486   0.547951 )
Norm@50keV  : 4.273176E-04    ( -1.645723E-04   1.648573E-04) )
------------------------------------------------------------
 Chi-Squared =      60.18392     using    59 PHA bins.
 Reduced chi-squared =      1.055858     for     57 degrees of freedom
 Null hypothesis probability = 0.361
 
Photon flux (15-150 keV)    in 64.00 sec: 7.510207E-02 ( -0.0186995  0.0187147 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.61721e-07 ( -8.04051e-08  8.7961e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to   64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.740392     ( -2.25961   3.56372 )
Epeak [keV] : 26.5347      ( -26.5247 9.22951 )
Norm@50keV  : 5.925614E-02    ( -5.925614E-02   1.24629 )
------------------------------------------------------------
 Chi-Squared =      57.82116     using    59 PHA bins.
 Reduced chi-squared =      1.032521     for     56 degrees of freedom
 Null hypothesis probability = 0.408
 
Photon flux (15-150 keV)    in 64.00 sec: 7.091190E-02 ( -0.0176354  0.0178986 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.9664e-07 ( -5.41523e-08  9.23808e-08 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to   64.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.38326   ( -14.9388   8.248806E-03) )
beta        : -2.77535    ( -1.55237   0.668922 )
Epeak [keV] : 21.9168      ( -6.19951 80.9068 )
Norm@50keV   : 1.791787E-03    ( -243.858   1720.38 )
------------------------------------------------------------
 Chi-Squared =      58.88899     using    59 PHA bins.
 Reduced chi-squared =      1.070709     for     55 degrees of freedom
 Null hypothesis probability = 0.335
 
Photon flux (15-150 keV)    in 64.00 sec: 7.407068E-02 ( -0.0180912  0.0184504 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20551e-07 ( -7.3591e-08  1.15259e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.000 sec. to   64.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.31175     ( -0.475486   0.547951 )
Norm@50keV  : 4.273176E-04    ( -1.645723E-04   1.648573E-04) )
------------------------------------------------------------
 Chi-Squared =      60.18392     using    59 PHA bins.
 Reduced chi-squared =      1.055858     for     57 degrees of freedom
 Null hypothesis probability = 0.361
 
Photon flux (15-150 keV)    in 64.00 sec: 7.510207E-02 ( -0.0186995  0.0187147 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.61721e-07 ( -8.04051e-08  8.7961e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to   64.000 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.740392     ( -2.25961   2.75235 )
Epeak [keV] : 26.5347      ( -26.5247 9.22951 )
Norm@50keV  : 5.925614E-02    ( -5.925614E-02   1.24629 )
------------------------------------------------------------
 Chi-Squared =      57.82116     using    59 PHA bins.
 but latest trial   2.03256     gives Chi-Squared =   3.30130
 Reduced chi-squared =      1.032521     for     56 degrees of freedom
 Null hypothesis probability = 0.408
 
Photon flux (15-150 keV)    in 64.00 sec: 7.091190E-02 ( -0.0176354  0.0178986 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.9664e-07 ( -5.41523e-08  9.23808e-08 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to   64.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.38326   ( -14.9389   8.248806E-03) )
beta        : -2.77535    ( -1.55237   0.668922 )
Epeak [keV] : 21.9168      ( -6.20832 80.9068 )
Norm@50keV   : 1.791787E-03    ( -243.858   1720.38 )
------------------------------------------------------------
 Chi-Squared =      58.88899     using    59 PHA bins.
 Reduced chi-squared =      1.070709     for     55 degrees of freedom
 Null hypothesis probability = 0.335
 
Photon flux (15-150 keV)    in 64.00 sec: 7.407068E-02 ( -0.0180912  0.0184504 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20551e-07 ( -7.3591e-08  1.15259e-07 ) ergs/cm2
 
Plot creation:
Wed May 21 17:31:26 EDT 2008