batgrbproduct Analysis for Trigger=231974

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Jan  2 07:30:49 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger231974/SDC
======================================================================

  Trigger: 00231974      Segment: 000

  BAT Trigger Time: 181443811.072   [s; MET]
      Trigger Stop: 181443819.264   [s; MET]
               UTC: 2006-10-02T01:03:29.592060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 220.345605609545   Dec: 48.7365696281697  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.16
     Image Trigger?:     NO
     Rate S/N Ratio:     9.05538513813742  [ if not an image trigger ]
     Image S/N Ratio:    8.16

  Flight Position:   [ source = BAT ]
    RA: 220.345605609545   Dec: 48.7365696281697  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 220.3591796088   Dec: 48.7308103849378  [deg; J2000]  
        { 14h 41m 26.2s , +48d 43' 50.9" }
         +/- 1.75918220872549 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.897651414624023 [arcmin] (formal 1-sigma fit error)
    SNR: 13.5729530060744
    RA  =  14h 41m 26.2s  (220.359180 deg.)
    Dec =  48d 43' 51" (48.730810 deg.)
 
  Angular difference between Flight and Ground position is 0.638719 arcmin
 
  Partial Coding Fraction: 0.390625    [ including projection effects ]

  Duration
     T90: 17.5920000076294 +/- 1.72699162056985
        Measured from: -1.56799998879433
                   to: 16.0240000188351     [s; relative to TRIGTIME]
     T50: 7.86400002241135 +/- 2.94145609289421
        Measured from: 4.53999999165535
                   to: 12.4040000140667     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -1.38400000333786     
                   to: -0.38400000333786     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.34799998998642     
                   to: 16.8680000007153     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.344144   0.377241   0.284758   0.045398
           0.043274   0.039495   0.034214   0.028601 [error]
 Peak      0.028462   0.040777   0.018572   0.003142
           0.009834   0.008894   0.007802   0.006512 [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 1.20e-07 1.88e-07 2.21e-07 5.06e-07 6.77e-07 1.03e-06   erg/cm2
              Error 2.36e-08 2.20e-08 3.43e-08 1.71e-07 8.09e-08 1.96e-07   erg/cm2
Peak flux Power-law 3.01e-01 2.73e-01 1.72e-01 1.65e-01 8.15e-01 9.10e-01   ph/cm2/s
              Error 1.58e-01 8.84e-02 6.52e-02 1.34e-01 2.56e-01 2.69e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.20e-07 1.88e-07 2.22e-07 5.03e-07 6.77e-07 9.72e-07   erg/cm2
              Error 2.36e-08 2.20e-08 3.44e-08 1.70e-07 8.10e-08 2.62e-07   erg/cm2
Peak flux Cutoff-PL 2.95e-01 2.77e-01 1.73e-01 1.49e-01 8.12e-01 8.82e-01   ph/cm2/s
              Error 1.70e-01 9.98e-02 7.00e-02 1.65e-01 2.57e-01 3.04e-01   ph/cm2/s
 
Fluence        Band 1.17e-07 1.87e-07 2.22e-07 5.13e-07 6.78e-07 1.05e-06   erg/cm2
              Error 1.28e-08 2.32e-08 2.30e-08 1.71e-07 7.94e-08 1.40e-07   erg/cm2
Peak flux      Band 2.78e-01 2.94e-01 1.67e-01 1.37e-01 8.06e-01 8.77e-01   ph/cm2/s
              Error 1.27e-01 1.12e-01 6.17e-02 2.55e-01 2.70e-01 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.761    0.210    -      -           3.82e-03 4.43e-04   64.464 57
CPL   1.738    0.000     715.2 5000.0      3.91e-03 3.47e-03   64.514 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.671    0.559    -      -           6.19e-03 1.89e-03   67.443 57
CPL   1.433    1.661     114.4    0.0      8.24e-03 8.25e-02   67.473  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: 41.472000 sec.
T50 in the 50-300 keV band: 16.832000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   19.216   -2.348   16.868
T90    17.592   -1.568   16.024
T50     7.864    4.540   12.404
Peak    1.000   -1.384   -0.384

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  220.3592 +48.7308 0.0143   46.1  -13.2       1.0813    13.6  TRIG_00231974       
------------------------------------------
 
Foreground time interval of the image:
 -2.348  16.868 (delta_t =  19.216 [sec])
Background time interval of the image:
-164.667  -2.348 (delta_t = 162.319 [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   -2.348 sec. to   16.868 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76136     ( -0.208121   0.212537 )
Norm@50keV  : 3.819568E-03    ( -4.460108E-04   4.403342E-04) )
------------------------------------------------------------
 Chi-Squared =      64.46429     using    59 PHA bins.
 Reduced chi-squared =      1.130952     for     57 degrees of freedom
 Null hypothesis probability = 0.232
 
Photon flux (15-150 keV)    in 19.22 sec: 0.518650 ( -0.061763  0.062073 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.76782e-07 ( -8.0428e-08  8.14236e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -2.348 sec. to   16.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73791     (     )
Epeak [keV] : 715.213      ( -80.4121 9919.58 )
Norm@50keV  : 3.908661E-03    ( -2.318577E-03   4.613023E-03) )
------------------------------------------------------------
 Chi-Squared =      64.51385     using    59 PHA bins.
 Reduced chi-squared =      1.152033     for     56 degrees of freedom
 Null hypothesis probability = 0.203
 
Photon flux (15-150 keV)    in 19.22 sec: 0.518431 ( -0.061737  0.062049 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.77071e-07 ( -8.07509e-08  8.12256e-08 ) ergs/cm2
 
Band function
Time interval is from   -2.348 sec. to   16.868 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.34472   ( -8.65528   2.70899 )
beta        : -1.76878    ( -8.23122   0.214236 )
Epeak [keV] : 34.3661      ( -34.2661 9965.63 )
Norm@50keV   : 8.231916E-03    ( -33.6355   1783.77 )
------------------------------------------------------------
 Chi-Squared =      64.42957     using    59 PHA bins.
 Reduced chi-squared =      1.171447     for     55 degrees of freedom
 Null hypothesis probability = 0.180
 
Photon flux (15-150 keV)    in 19.22 sec: 0.513966 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.78203e-07 ( -7.92537e-08  7.94593e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -1.384 sec. to   -0.384 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67136     ( -0.553970   0.563415 )
Norm@50keV  : 6.193891E-03    ( -1.909407E-03   1.867611E-03) )
------------------------------------------------------------
 Chi-Squared =      67.44314     using    59 PHA bins.
 Reduced chi-squared =      1.183213     for     57 degrees of freedom
 Null hypothesis probability = 0.162
 
Photon flux (15-150 keV)    in 1.000 sec: 0.814564 ( -0.254299  0.257656 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.74719e-08 ( -1.8067e-08  1.84492e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -1.384 sec. to   -0.384 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.43277     ( -2.39055   0.931365 )
Epeak [keV] : 114.399      (   )
Norm@50keV  : 8.244747E-03    ( -2.145327E-03   0.162787 )
------------------------------------------------------------
 Chi-Squared =      67.47332     using    59 PHA bins.
 but latest trial   2.36408     gives Chi-Squared =  0.405159
 Reduced chi-squared =      1.204881     for     56 degrees of freedom
 Null hypothesis probability = 0.140
 
Photon flux (15-150 keV)    in 1.000 sec: 0.811833 ( -0.254771  0.259847 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.70353e-08 ( -1.01117e-08  1.86148e-08 ) ergs/cm2
 
Band function
Time interval is from   -1.384 sec. to   -0.384 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.594853   ( -9.40515   5.59485 )
beta        : -1.79017    ( -8.20983   0.638658 )
Epeak [keV] : 42.1512      ( -42.0512 522.224 )
Norm@50keV   : 3.186214E-02    ( -127.049   175.088 )
------------------------------------------------------------
 Chi-Squared =      67.13963     using    59 PHA bins.
 Reduced chi-squared =      1.220721     for     55 degrees of freedom
 Null hypothesis probability = 0.126
 
Photon flux (15-150 keV)    in 1.000 sec: 0.806199 ( -0.264034  0.246821 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.61399e-08 ( -1.6529e-08  1.71425e-08 ) ergs/cm2
 
Plot creation:
Wed Jan  2 07:50:39 EST 2008