batgrbproduct Analysis for Trigger=307931

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sun Mar 30 20:53:27 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger307931/SDC
======================================================================

  Trigger: 00307931      Segment: 000

  BAT Trigger Time: 228384187.264   [s; MET]
      Trigger Stop: 228384188.288   [s; MET]
               UTC: 2008-03-28T08:03:04.588480    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 80.4787347010336   Dec: 47.5240403992213  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.28
     Image Trigger?:     NO
     Rate S/N Ratio:     44.2492937796752  [ if not an image trigger ]
     Image S/N Ratio:    15.28

  Flight Position:   [ source = BAT ]
    RA: 80.4787347010336   Dec: 47.5240403992213  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 80.4898416631501   Dec: 47.5225864239297  [deg; J2000]  
        { 05h 21m 57.6s , +47d 31' 21.3" }
         +/- 0.653210124553351 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.25934675044872 [arcmin] (formal 1-sigma fit error)
    SNR: 55.8892796473882
    RA  =   5h 21m 57.6s  (80.489842 deg.)
    Dec =   47d 31' 21" (47.522586 deg.)
 
  Angular difference between Flight and Ground position is 0.458403 arcmin
 
  Partial Coding Fraction: 0.3710938    [ including projection effects ]

  Duration
     T90: 90.2080000042915 +/- 1.42857690277162
        Measured from: 0.0760000050067902
                   to: 90.2840000092983     [s; relative to TRIGTIME]
     T50: 65.7800000011921 +/- 1.19746396987325
        Measured from: 9.96799999475479
                   to: 75.7479999959469     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 9.28000000119209     
                   to: 10.2800000011921     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.24399998784065     
                   to: 111.439999997616     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.771485   4.941622   4.248380   1.284061
           0.077938   0.081285   0.075357   0.065972 [error]
 Peak      0.100444   0.206321   0.280844   0.120488
           0.010949   0.012786   0.014112   0.011762 [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 1.30e-06 2.35e-06 3.27e-06 9.52e-06 9.40e-06 1.64e-05   erg/cm2
              Error 6.46e-08 6.67e-08 8.04e-08 5.70e-07 2.05e-07 5.88e-07   erg/cm2
Peak flux Power-law 1.10e+00 1.59e+00 1.72e+00 3.45e+00 5.48e+00 7.86e+00   ph/cm2/s
              Error 1.51e-01 1.33e-01 1.04e-01 4.59e-01 3.46e-01 5.04e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.26e-06 2.35e-06 3.30e-06 8.70e-06 9.37e-06 1.56e-05   erg/cm2
              Error 7.78e-08 6.63e-08 9.99e-08 1.42e-06 2.21e-07 1.43e-06   erg/cm2
Peak flux Cutoff-PL 1.05e+00 1.60e+00 1.76e+00 2.96e+00 5.45e+00 7.49e+00   ph/cm2/s
              Error 1.97e-01 1.37e-01 1.38e-01 9.08e-01 2.59e-01 1.01e+00   ph/cm2/s
 
Fluence        Band 1.25e-06 2.34e-06 3.29e-06 8.76e-06 9.36e-06 1.50e-05   erg/cm2
              Error 8.88e-08 6.75e-08 9.97e-08 1.06e-06 2.20e-07 0.00e+00   erg/cm2
Peak flux      Band 1.03e+00 1.61e+00 1.76e+00 3.17e+00 5.43e+00 7.57e+00   ph/cm2/s
              Error 2.43e-01 1.41e-01 1.42e-01 5.84e-01 2.75e-01 6.76e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.521    0.043    -      -           8.74e-03 1.93e-04   44.323 57
CPL   1.437    0.148     402.9 5000.0      9.48e-03 1.29e-03   43.866 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.892    0.107    -      -           4.77e-02 3.00e-03   63.455 57
CPL   0.732    0.365     495.3 5000.0      5.56e-02 2.04e-02   62.982 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: 87.168000 sec.
T50 in the 50-300 keV band: 25.216000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  113.684   -2.244  111.440
T90    90.208    0.076   90.284
T50    65.780    9.968   75.748
Peak    1.000    9.280   10.280

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   80.4898 +47.5226 0.0035   45.0    2.0       7.0978    55.9  TRIG_00307931       
------------------------------------------
 
Foreground time interval of the image:
 -2.244  23.341 (delta_t =  25.585 [sec])
Background time interval of the image:
-239.264  -2.244 (delta_t = 237.020 [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   -2.244 sec. to  111.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.52140     ( -4.345310E-02   4.340732E-02) )
Norm@50keV  : 8.744957E-03    ( -1.927102E-04   1.925295E-04) )
------------------------------------------------------------
 Chi-Squared =      44.32313     using    59 PHA bins.
 Reduced chi-squared =     0.7775987     for     57 degrees of freedom
 Null hypothesis probability = 0.890
 
Photon flux (15-150 keV)    in 113.7 sec: 1.09812 ( -0.02962  0.0298 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.40039e-06 ( -2.04569e-07  2.04592e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -2.244 sec. to  111.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.43732     ( -0.174643   0.121307 )
Epeak [keV] : 402.873      ( -402.863 9597.13 )
Norm@50keV  : 9.479201E-03    ( -8.864999E-04   1.683641E-03) )
------------------------------------------------------------
 Chi-Squared =      43.86578     using    59 PHA bins.
 Reduced chi-squared =     0.7833174     for     56 degrees of freedom
 Null hypothesis probability = 0.880
 
Photon flux (15-150 keV)    in 113.7 sec: 1.09082 ( -0.01746  0.03405 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.36712e-06 ( -2.17087e-07  2.24421e-07 ) ergs/cm2
 
Band function
Time interval is from   -2.244 sec. to  111.440 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.38345   ( -8.61655   0.440833 )
beta        : -1.56074    ( -8.43926   7.730460E-02) )
Epeak [keV] : 230.020      ( -229.920 9769.98 )
Norm@50keV   : 1.013720E-02    ( -1.278006E-03   227.926 )
------------------------------------------------------------
 Chi-Squared =      43.87297     using    59 PHA bins.
 Reduced chi-squared =     0.7976903     for     55 degrees of freedom
 Null hypothesis probability = 0.859
 
Photon flux (15-150 keV)    in 113.7 sec: 1.08787 ( -0.03879  0.03574 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.36189e-06 ( -2.20987e-07  2.19975e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    9.280 sec. to   10.280 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.892267     ( -0.108248   0.105821 )
Norm@50keV  : 4.773314E-02    ( -3.016394E-03   2.990305E-03) )
------------------------------------------------------------
 Chi-Squared =      63.45524     using    59 PHA bins.
 Reduced chi-squared =      1.113250     for     57 degrees of freedom
 Null hypothesis probability = 0.259
 
Photon flux (15-150 keV)    in 1.000 sec: 5.47843 ( -0.34525  0.34597 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.37319e-07 ( -3.2988e-08  3.3002e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    9.280 sec. to   10.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.731764     ( -0.478967   0.251158 )
Epeak [keV] : 495.290      ( -495.280 9504.71 )
Norm@50keV  : 5.564219E-02    ( -1.035692E-02   3.050868E-02) )
------------------------------------------------------------
 Chi-Squared =      62.98187     using    59 PHA bins.
 Reduced chi-squared =      1.124676     for     56 degrees of freedom
 Null hypothesis probability = 0.243
 
Photon flux (15-150 keV)    in 1.000 sec: 5.45313 ( -0.17469  0.34231 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.37089e-07 ( -3.3105e-08  3.3179e-08 ) ergs/cm2
 
Band function
Time interval is from    9.280 sec. to   10.280 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.793760   ( -9.20624   5.79376 )
beta        : -0.892270    ( -0.105797   0.108294 )
Epeak [keV] : 24.9035      ( -1.32910 9.765625E-04) )
Norm@50keV   : 7.220993E-02    ( -3.024291E-03   2.997126E-03) )
------------------------------------------------------------
 Chi-Squared =      63.45523     using    59 PHA bins.
 Reduced chi-squared =      1.153731     for     55 degrees of freedom
 Null hypothesis probability = 0.203
 
Photon flux (15-150 keV)    in 1.000 sec: 5.43348 ( -0.36619  0.18363 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.36765e-07 ( -3.3291e-08  3.3238e-08 ) ergs/cm2
 
Plot creation:
Sun Mar 30 21:54:01 EDT 2008