batgrbproduct Analysis for Trigger=310125

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Fri Apr 25 14:14:35 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger310125/GCN5_download_cron
======================================================================

  Trigger: 00310125      Segment: 000

  BAT Trigger Time: 230793240   [s; MET]
      Trigger Stop: 230793328   [s; MET]
               UTC: 2008-04-25T05:13:57.257200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 341.689772081705   Dec: 44.3371798544384  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    19.47
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    19.47

  Flight Position:   [ source = BAT ]
    RA: 341.689772081705   Dec: 44.3371798544384  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 341.69870702022   Dec: 44.3225230569668  [deg; J2000]  
        { 22h 46m 47.7s , +44d 19' 21.1" }
         +/- 1.42171502966041 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.497563661769292 [arcmin] (formal 1-sigma fit error)
    SNR: 18.3998689815867
    RA  =  22h 46m 47.7s  (341.698707 deg.)
    Dec =   44d 19' 21" (44.322523 deg.)
 
  Angular difference between Flight and Ground position is 0.959385 arcmin
 
  Partial Coding Fraction: 0.6015625    [ including projection effects ]

  Duration
     T90: 443.548000007868 +/- 250.300212215046
        Measured from: -21.4359999895096
                   to: 422.112000018358     [s; relative to TRIGTIME]
     T50: 122.980000019073 +/- 46.7256478062551
        Measured from: 14.5119999945164
                   to: 137.49200001359     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -28.9920000135899     
                   to: -27.9920000135899     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -28.9679999947548     
                   to: 672.183999985456     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.408321   1.515462   0.314056   0.052481
           0.137237   0.135098   0.118311   0.103365 [error]
 Peak      0.055920   0.009615   0.005906   0.005510
           0.009851   0.009286   0.007827   0.006738 [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 1.46e-06 6.66e-07 1.84e-07 6.32e-08 2.34e-06 2.37e-06   erg/cm2
              Error 1.53e-07 8.50e-08 5.65e-08 3.50e-08 1.98e-07 2.05e-07   erg/cm2
Peak flux Power-law 3.82e-01 1.75e-01 4.83e-02 1.67e-02 6.15e-01 6.22e-01   ph/cm2/s
              Error 1.66e-01 1.31e-01 5.16e-02 3.98e-02 2.39e-01 2.45e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.46e-06 6.66e-07 1.83e-07 6.26e-08 2.34e-06 2.37e-06   erg/cm2
              Error 1.53e-07 8.51e-08 5.65e-08 3.47e-08 1.98e-07 2.04e-07   erg/cm2
Peak flux Cutoff-PL 3.82e-01 1.75e-01 4.83e-02 1.65e-02 6.15e-01 6.21e-01   ph/cm2/s
              Error 1.66e-01 1.31e-01 5.16e-02 3.95e-02 2.39e-01 2.45e-01   ph/cm2/s
 
Fluence        Band 1.46e-06 6.37e-07 1.42e-07 3.81e-08 2.27e-06 2.27e-06   erg/cm2
              Error 1.61e-07 9.49e-08 3.75e-08 2.47e-08 2.29e-07 1.78e-07   erg/cm2
Peak flux      Band 3.82e-01 1.75e-01 4.83e-02 1.65e-02 6.15e-01 6.21e-01   ph/cm2/s
              Error 1.66e-01 1.31e-01 5.17e-02 3.95e-02 2.39e-01 2.45e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    3.818    0.289    -      -           1.73e-04 3.93e-05   48.178 57
CPL   1.862    0.000       1.7    0.0      5.49e-03 1.79e-03   50.151 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.855    1.088    -      -           2.48e-03 2.34e-03   58.004 57
CPL   1.952    1.426       1.3    0.0      1.24e-02 0.00e+00   58.288  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  701.152  -28.968  672.184
T90   443.548  -21.436  422.112
T50   122.980   14.512  137.492
Peak    1.000  -28.992  -27.992

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  341.6987 +44.3225 0.0104   24.8 -107.0       2.6128    18.4  TRIG_00310125       
------------------------------------------
 
Foreground time interval of the image:
 -5.799 107.301 (delta_t = 113.100 [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  -28.968 sec. to  672.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.81850     ( -0.243396   0.335033 )
Norm@50keV  : 1.728448E-04    ( -4.211110E-05   3.648242E-05) )
------------------------------------------------------------
 Chi-Squared =      48.17771     using    59 PHA bins.
 Reduced chi-squared =     0.8452229     for     57 degrees of freedom
 Null hypothesis probability = 0.791
 
Photon flux (15-150 keV)    in 701.2 sec: 9.149559E-02 ( -0.00797463  0.00802415 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34228e-06 ( -1.98306e-07  1.98475e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -28.968 sec. to  672.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.86212     (     )
Epeak [keV] : 1.69752      (   )
Norm@50keV  : 5.489315E-03    ( -1.462231E-03   2.112886E-03) )
------------------------------------------------------------
 Chi-Squared =      50.15121     using    59 PHA bins.
 Reduced chi-squared =     0.8955573     for     56 degrees of freedom
 Null hypothesis probability = 0.695
 
Photon flux (15-150 keV)    in 701.2 sec: 9.143826E-02 ( -0.00796853  0.00801737 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34149e-06 ( -1.97907e-07  1.98832e-07 ) ergs/cm2
 
Band function
Time interval is from  -28.968 sec. to  672.184 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.45933   ( -0.285731   0.265418 )
beta        : -7.47013    ( -2.52987   17.4333 )
Epeak [keV] : 9.50776      ( -9.40776 6.66512 )
Norm@50keV   : 3.802672E-03    ( -7.470324E-02   115.133 )
------------------------------------------------------------
 Chi-Squared =      73.30212     using    59 PHA bins.
 Reduced chi-squared =      1.332766     for     55 degrees of freedom
 Null hypothesis probability = 5.008E-02
 
Photon flux (15-150 keV)    in 701.2 sec: 9.069664E-02 ( -0.00813504  0.00749259 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.26707e-06 ( -2.33058e-07  2.24573e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  -28.968 sec. to  -28.016 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.85516     ( -0.909047   1.26705 )
Norm@50keV  : 2.478767E-03    ( -2.478767E-03   2.210078E-03) )
------------------------------------------------------------
 Chi-Squared =      58.00449     using    59 PHA bins.
 Reduced chi-squared =      1.017623     for     57 degrees of freedom
 Null hypothesis probability = 0.438
 
Photon flux (15-150 keV)    in 0.9520 sec: 0.614845 ( -0.238879  0.239651 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.6624e-08 ( -1.26894e-08  1.54048e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -28.968 sec. to  -28.016 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.95156     ( -0.889227   1.96197 )
Epeak [keV] : 1.31772      (   )
Norm@50keV  : 1.238882E-02    (     )
------------------------------------------------------------
 Chi-Squared =      58.28772     using    59 PHA bins.
 but latest trial   1.06233     gives Chi-Squared =   8.92389
 but latest trial  -3.41199     gives Chi-Squared =   5.65681
 Reduced chi-squared =      1.040852     for     56 degrees of freedom
 Null hypothesis probability = 0.391
 
Photon flux (15-150 keV)    in 0.9520 sec: 0.614563 ( -0.238799  0.239575 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.66088e-08 ( -1.26855e-08  1.54115e-08 ) ergs/cm2
 
Band function
Time interval is from  -28.968 sec. to  -28.016 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.92077   ( -9.28221   5.71779 )
beta        : -7.90575    ( -6.67926   1.27969 )
Epeak [keV] : 8.53111      ( -11.9743 16.0982 )
Norm@50keV   : 5.807984E-03    ( -8.000000E-02   16860.3 )
------------------------------------------------------------
 Chi-Squared =      59.42583     using    59 PHA bins.
 Reduced chi-squared =      1.080470     for     55 degrees of freedom
 Null hypothesis probability = 0.318
 
Photon flux (15-150 keV)    in 0.9520 sec: 0.614561 ( -0.238796  0.239575 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.31955e-08 ( -8.7723e-09  7.54441e-09 ) ergs/cm2
 
Plot creation:
Fri Apr 25 14:57:58 EDT 2008