batgrbproduct Analysis for Trigger=146970

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Jan  7 16:58:21 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger146970/SDC
======================================================================

  Trigger: 00146970      Segment: 000

  BAT Trigger Time: 143612953.92   [s; MET]
      Trigger Stop: 143612959.424   [s; MET]
               UTC: 2005-07-21T04:29:14.287540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 253.445004837197   Dec: -28.3896705827692  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.22
     Image Trigger?:     NO
     Rate S/N Ratio:     15.0996688705415  [ if not an image trigger ]
     Image S/N Ratio:    6.22

  Flight Position:   [ source = BAT ]
    RA: 253.445004837197   Dec: -28.3896705827692  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 253.461055355825   Dec: -28.38832419309  [deg; J2000]  
        { 16h 53m 50.7s , -28d 23' 18.0" }
         +/- 2.06918474673001 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.820170009180595 [arcmin] (formal 1-sigma fit error)
    SNR: 10.7640713576373
    RA  =  16h 53m 50.7s  (253.461055 deg.)
    Dec = -28d 23' 18" (-28.388324 deg.)
 
  Angular difference between Flight and Ground position is 0.851060 arcmin
 
  Partial Coding Fraction: 0.06445312    [ including projection effects ]

  Duration
     T90: 103.871999979019 +/- 46.2783163853342
        Measured from: -0.647999972105026
                   to: 103.224000006914     [s; relative to TRIGTIME]
     T50: 30.6879999935627 +/- 10.6199504618228
        Measured from: 3.90800002217293
                   to: 34.5960000157356     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.00400000810623     
                   to: 3.00400000810623     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.00399997830391     
                   to: 149.436000019312     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.232562   2.486967   1.572248   0.309999
           0.255634   0.228240   0.192787   0.161741 [error]
 Peak      0.118516   0.121838   0.078735   0.029434
           0.026722   0.024033   0.021644   0.014193 [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 7.74e-07 1.14e-06 1.25e-06 2.57e-06 3.94e-06 5.74e-06   erg/cm2
              Error 1.27e-07 1.18e-07 1.85e-07 7.89e-07 4.39e-07 9.57e-07   erg/cm2
Peak flux Power-law 1.45e+00 8.85e-01 3.47e-01 1.82e-01 2.77e+00 2.86e+00   ph/cm2/s
              Error 4.45e-01 2.11e-01 1.37e-01 1.31e-01 6.58e-01 6.73e-01   ph/cm2/s
 
Fluence   Cutoff-PL 7.01e-07 1.23e-06 1.27e-06 9.39e-07 3.74e-06 4.19e-06   erg/cm2
              Error 1.50e-07 1.57e-07 2.09e-07 1.17e-06 4.95e-07 1.31e-06   erg/cm2
Peak flux Cutoff-PL 1.25e+00 1.02e+00 3.82e-01 6.75e-02 2.71e+00 2.72e+00   ph/cm2/s
              Error 5.23e-01 2.77e-01 1.77e-01 1.00e-01 6.65e-01 5.06e-01   ph/cm2/s
 
Fluence        Band 6.88e-07 1.24e-06 1.23e-06 1.67e-06 3.77e-06 4.83e-06   erg/cm2
              Error 1.56e-07 1.62e-07 2.27e-07 1.47e-06 4.74e-07 1.61e-06   erg/cm2
Peak flux      Band 1.25e+00 1.02e+00 3.82e-01 6.77e-02 2.71e+00 2.72e+00   ph/cm2/s
              Error 5.17e-01 2.76e-01 1.77e-01 1.32e-01 6.66e-01 6.77e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.867    0.184    -      -           2.82e-03 3.12e-04   63.634 57
CPL   1.129    0.872      54.8 4979.7      6.96e-03 1.12e-02   61.191  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.353    0.426    -      -           1.54e-02 4.80e-03   59.260 57
CPL   1.163    1.290      32.5   26.9      6.92e-02 5.31e-01   57.445  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: 26.176000 sec.
T50 in the 50-300 keV band: 12.032000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  152.440   -3.004  149.436
T90   103.872   -0.648  103.224
T50    30.688    3.908   34.596
Peak    1.000    2.004    3.004

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  253.4611 -28.3883 0.0178   39.1   91.4       6.8097    10.8  TRIG_00146970       
------------------------------------------
 
Foreground time interval of the image:
 -3.004 122.685 (delta_t = 125.689 [sec])
Background time interval of the image:
-291.415  -3.004 (delta_t = 288.411 [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   -3.004 sec. to  149.436 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.86690     ( -0.181321   0.186436 )
Norm@50keV  : 2.815307E-03    ( -3.143863E-04   3.103602E-04) )
------------------------------------------------------------
 Chi-Squared =      63.63424     using    59 PHA bins.
 Reduced chi-squared =      1.116390     for     57 degrees of freedom
 Null hypothesis probability = 0.254
 
Photon flux (15-150 keV)    in 152.4 sec: 0.398468 ( -0.042457  0.04261 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.94355e-06 ( -4.36184e-07  4.41564e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -3.004 sec. to  149.436 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.12863     ( -0.952430   0.791253 )
Epeak [keV] : 54.7565      ( -14.1968 9945.24 )
Norm@50keV  : 6.963455E-03    ( -6.963455E-03   1.539312E-02) )
------------------------------------------------------------
 Chi-Squared =      61.19067     using    59 PHA bins.
 but latest trial   1.92198     gives Chi-Squared =   2.73017
 Reduced chi-squared =      1.092691     for     56 degrees of freedom
 Null hypothesis probability = 0.295
 
Photon flux (15-150 keV)    in 152.4 sec: 0.385540 ( -0.044858  0.04488 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.73653e-06 ( -4.92603e-07  4.98257e-07 ) ergs/cm2
 
Band function
Time interval is from   -3.004 sec. to  149.436 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.901177   ( -1.37257   4.10578 )
beta        : -2.29806    ( -7.70194   0.494905 )
Epeak [keV] : 48.4693      ( -17.8785 580.742 )
Norm@50keV   : 9.764692E-03    ( -9.764692E-03   109.267 )
------------------------------------------------------------
 Chi-Squared =      60.84074     using    59 PHA bins.
 Reduced chi-squared =      1.106195     for     55 degrees of freedom
 Null hypothesis probability = 0.274
 
Photon flux (15-150 keV)    in 152.4 sec: 0.384928 ( -0.045751  0.044032 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.77355e-06 ( -4.83169e-07  4.63936e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    2.004 sec. to    3.004 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.35258     ( -0.383817   0.468373 )
Norm@50keV  : 1.540880E-02    ( -4.932614E-03   4.674074E-03) )
------------------------------------------------------------
 Chi-Squared =      59.25997     using    59 PHA bins.
 Reduced chi-squared =      1.039649     for     57 degrees of freedom
 Null hypothesis probability = 0.393
 
Photon flux (15-150 keV)    in 1.000 sec: 2.77388 ( -0.65799  0.6589 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48779e-07 ( -3.871e-08  3.9403e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    2.004 sec. to    3.004 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16313     ( -2.11087   0.468869 )
Epeak [keV] : 32.4656      ( -32.4556 21.4070 )
Norm@50keV  : 6.916161E-02    ( -6.916161E-02   0.992661 )
------------------------------------------------------------
 Chi-Squared =      57.44509     using    59 PHA bins.
 but latest trial   2.06252     gives Chi-Squared =   3.32550
 Reduced chi-squared =      1.025805     for     56 degrees of freedom
 Null hypothesis probability = 0.421
 
Photon flux (15-150 keV)    in 1.000 sec: 2.71323 ( -0.66652  0.66443 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.4669e-07 ( -3.8649e-08  3.9869e-08 ) ergs/cm2
 
Band function
Time interval is from    2.004 sec. to    3.004 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.25429   ( -8.74571   2.14599 )
beta        : -8.93646    ( -1.06354   6.81034 )
Epeak [keV] : 31.3611      ( -31.2611 22.5345 )
Norm@50keV   : 6.181292E-02    ( -6.181291E-02   0.999896 )
------------------------------------------------------------
 Chi-Squared =      57.45163     using    59 PHA bins.
 Reduced chi-squared =      1.044575     for     55 degrees of freedom
 Null hypothesis probability = 0.384
 
Photon flux (15-150 keV)    in 1.000 sec: 2.71324 ( -0.66655  0.66535 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.464e-07 ( -3.8218e-08  3.9943e-08 ) ergs/cm2
 
Plot creation:
Mon Jan  7 17:14:32 EST 2008