batgrbproduct Analysis for Trigger=318832

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sat Aug  2 18:48:22 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger318832/SDC
======================================================================

  Trigger: 00318832      Segment: 000

  BAT Trigger Time: 239382744.064   [s; MET]
      Trigger Stop: 239382748.16   [s; MET]
               UTC: 2008-08-02T15:12:21.075860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 270.748505066349   Dec: -32.3332776459289  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.06
     Image Trigger?:     NO
     Rate S/N Ratio:     8.30662386291807  [ if not an image trigger ]
     Image S/N Ratio:    7.06

  Flight Position:   [ source = BAT ]
    RA: 270.748505066349   Dec: -32.3332776459289  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 270.7293429085   Dec: -32.3293221008975  [deg; J2000]  
        { 18h 02m 55.0s , -32d 19' 45.6" }
         +/- 1.56838190389984 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.738960862706656 [arcmin] (formal 1-sigma fit error)
    SNR: 15.9919524709473
 
  Angular difference between Flight and Ground position is 1.000057 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 176 +/- 50.5964425626941
        Measured from: -31.0640000104904
                   to: 144.93599998951     [s; relative to TRIGTIME]
     T50: 80 +/- 16
        Measured from: -15.0640000104904
                   to: 64.9359999895096     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -7.56400001049042     
                   to: -6.56400001049042     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -31.0640000104904     
                   to: 176.93599998951     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.824563   0.943601   0.490307   0.222442
           0.087180   0.079828   0.071537   0.069973 [error]
 Peak      0.170060   0.186832   0.134453   0.037831
           0.024584   0.022389   0.020185   0.019590 [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 2.22e-07 3.50e-07 4.15e-07 9.54e-07 1.26e-06 1.95e-06   erg/cm2
              Error 3.51e-08 3.60e-08 6.72e-08 3.17e-07 1.56e-07 3.82e-07   erg/cm2
Peak flux Power-law 8.62e-02 8.38e-02 5.69e-02 6.06e-02 2.51e-01 2.88e-01   ph/cm2/s
              Error 1.95e-02 1.14e-02 1.05e-02 2.33e-02 3.31e-02 3.87e-02   ph/cm2/s
 
Fluence   Cutoff-PL 2.05e-07 3.81e-07 4.02e-07 2.72e-07 1.15e-06 1.26e-06   erg/cm2
              Error 4.03e-08 4.95e-08 7.90e-08 5.06e-07 1.86e-07 5.05e-07   erg/cm2
Peak flux Cutoff-PL 8.59e-02 8.39e-02 5.69e-02 6.02e-02 2.51e-01 2.82e-01   ph/cm2/s
              Error 1.95e-02 1.14e-02 1.05e-02 2.31e-02 3.31e-02 4.84e-02   ph/cm2/s
 
Fluence        Band 2.02e-07 3.84e-07 3.90e-07 5.84e-07 1.18e-06 1.57e-06   erg/cm2
              Error 4.12e-08 5.11e-08 7.89e-08 4.95e-07 1.71e-07 4.28e-07   erg/cm2
Peak flux      Band 8.62e-02 8.39e-02 5.69e-02 6.01e-02 2.51e-01 2.87e-01   ph/cm2/s
              Error 1.97e-02 1.24e-02 1.05e-02 2.31e-02 3.31e-02 3.86e-02   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.756    0.190    -      -           6.59e-04 7.79e-05   50.019 57
CPL   0.968    0.917      56.1 4978.6      1.83e-03 3.39e-03   47.401 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.559    0.248    -      -           1.98e-03 2.77e-04   59.027 57
CPL   1.332    0.627     139.7    0.0      2.57e-03 2.16e-03   59.277 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: 20.352000 sec.
T50 in the 50-300 keV band: 8.576000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  208.000  -31.064  176.936
T90   176.000  -31.064  144.936
T50    80.000  -15.064   64.936
Peak    1.000   -7.564   -6.564

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  270.7293 -32.3293 0.0121    4.9  173.5       1.7168    16.0  TRIG_00318832       
------------------------------------------
 
Foreground time interval of the image:
-31.064  45.141 (delta_t =  76.205 [sec])
Background time interval of the image:
-239.064 -237.916 (delta_t =   1.148 [sec])
-236.064 -235.841 (delta_t =   0.223 [sec])
-235.064 -234.617 (delta_t =   0.447 [sec])
-233.064 -227.791 (delta_t =   5.273 [sec])
-227.064 -31.064 (delta_t = 196.000 [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  -31.064 sec. to  176.936 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.75563     ( -0.187376   0.193022 )
Norm@50keV  : 6.591029E-04    ( -7.852144E-05   7.725827E-05) )
------------------------------------------------------------
 Chi-Squared =      50.01943     using    59 PHA bins.
 Reduced chi-squared =     0.8775339     for     57 degrees of freedom
 Null hypothesis probability = 0.732
 
Photon flux (15-150 keV)    in 208.0 sec: 8.930766E-02 ( -0.00921489  0.00922057 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26473e-06 ( -1.5449e-07  1.57787e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -31.064 sec. to  176.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.967924     ( -1.01491   0.818532 )
Epeak [keV] : 56.1497      ( -13.4018 9943.85 )
Norm@50keV  : 1.828932E-03    ( -1.828932E-03   4.960684E-03) )
------------------------------------------------------------
 Chi-Squared =      47.40135     using    59 PHA bins.
 Reduced chi-squared =     0.8464527     for     56 degrees of freedom
 Null hypothesis probability = 0.787
 
Photon flux (15-150 keV)    in 208.0 sec: 8.585617E-02 ( -0.00984375  0.00987145 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15256e-06 ( -1.79076e-07  1.93417e-07 ) ergs/cm2
 
Band function
Time interval is from  -31.064 sec. to  176.936 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.06052   ( -0.979330   5.48198 )
beta        : -2.44292    ( -7.84451   0.470464 )
Epeak [keV] : 57.1145      ( -24.1209 228.404 )
Norm@50keV   : 1.636698E-03    ( -1.69120   26.2247 )
------------------------------------------------------------
 Chi-Squared =      47.26213     using    59 PHA bins.
 Reduced chi-squared =     0.8593115     for     55 degrees of freedom
 Null hypothesis probability = 0.761
 
Photon flux (15-150 keV)    in 208.0 sec: 8.615613E-02 ( -0.00964183  0.00989792 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18441e-06 ( -1.63889e-07  1.77568e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  -15.064 sec. to    0.936 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.55867     ( -0.246136   0.250785 )
Norm@50keV  : 1.980708E-03    ( -2.796955E-04   2.748871E-04) )
------------------------------------------------------------
 Chi-Squared =      59.02724     using    59 PHA bins.
 Reduced chi-squared =      1.035566     for     57 degrees of freedom
 Null hypothesis probability = 0.401
 
Photon flux (15-150 keV)    in 16.00 sec: 0.251380 ( -0.033118  0.033175 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.97976e-07 ( -4.5776e-08  4.68576e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -15.064 sec. to    0.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.33215     ( -0.765490   0.488491 )
Epeak [keV] : 139.666      (   )
Norm@50keV  : 2.565428E-03    ( -4.181077E-04   3.898320E-03) )
------------------------------------------------------------
 Chi-Squared =      59.27656     using    59 PHA bins.
 Reduced chi-squared =      1.058510     for     56 degrees of freedom
 Null hypothesis probability = 0.357
 
Photon flux (15-150 keV)    in 16.00 sec: 0.251282 ( -0.033105  0.033163 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.97966e-07 ( -4.5752e-08  4.68864e-08 ) ergs/cm2
 
Band function
Time interval is from  -15.064 sec. to    0.936 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.18688   ( -8.81312   6.05320 )
beta        : -1.56145    ( -8.43855   0.247494 )
Epeak [keV] : 47.8567      ( -47.7567 9950.49 )
Norm@50keV   : 3.922062E-03    ( -0.237107   1067.74 )
------------------------------------------------------------
 Chi-Squared =      58.99458     using    59 PHA bins.
 Reduced chi-squared =      1.072629     for     55 degrees of freedom
 Null hypothesis probability = 0.332
 
Photon flux (15-150 keV)    in 16.00 sec: 0.251296 ( -0.033121  0.033116 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.96419e-07 ( -4.58816e-08  4.65792e-08 ) ergs/cm2
 
Plot creation:
Sat Aug  2 19:15:46 EDT 2008