Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 05:16:06 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger297628
======================================================================

  Trigger: 00297628      Segment: 000

  BAT Trigger Time: 217987437.696   [s; MET]
      Trigger Stop: 217987441.792   [s; MET]
               UTC: 2007-11-29T00:03:55.301720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 220.089670547025   Dec: -26.6590902014323  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.85
     Image Trigger?:     NO
     Rate S/N Ratio:     11.5325625946708  [ if not an image trigger ]
     Image S/N Ratio:    11.85

  Analysis Position:   [ source = BAT ]
    RA: 220.089670547025   Dec: -26.6590902014323  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 220.048957876435   Dec: -26.6699762684598  [deg; J2000]  
        { 14h 40m 11.7s , -26d 40' 11.9" }
         +/- 2.06367015489598 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.06871041757118 [arcmin] (formal 1-sigma fit error)
    SNR: 10.8051863397994
 
  Angular difference between the analysis and refined position is 2.278593 arcmin
 
  Partial Coding Fraction: 0.5546875    [ including projection effects ]

  Duration
     T90: 408.080000013113 +/- 52.3240852031849
        Measured from: -0.412000000476837
                   to: 407.668000012636     [s; relative to TRIGTIME]
     T50: 186.136000007391 +/- 23.5661112465353
        Measured from: 15.6359999775887
                   to: 201.77199998498     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.82799997925758     
                   to: 6.82799997925758     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -5.64000001549721     
                   to: 465.079999983311     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.227064   2.595751   1.522351   0.171889
           0.151452   0.156152   0.139981   0.133959 [error]
 Peak      0.031898   0.026211   0.049538   0.013780
           0.007360   0.007821   0.007235   0.006424 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  470.720   -5.640  465.080
T90   408.080   -0.412  407.668
T50   186.136   15.636  201.772
Peak    1.000    5.828    6.828
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.860    -0.139      0.135       -           -               -         8.48e-04     -7.22e-05          7.11e-05      60.190   57
CPL     -1.473    -0.473      0.588       59.318     -14.483       -59.318      1.40e-03     -5.93e-04          1.55e-03      58.580   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.267     -0.364     0.364       -           -               -         7.80e-03     -1.53e-03          1.53e-03      65.150   57
CPL     -1.122     -2.424     1.620      334.761    -334.761      -334.761      9.10e-03     -2.81e-03          3.45e-02      65.200   56
 
 
=== 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         PL   7.16e-07  1.06e-06  1.16e-06  2.41e-06  3.67e-06  5.35e-06   erg/cm2
      90%_error_low -7.77e-08 -7.53e-08 -1.36e-07 -5.30e-07 -3.10e-07 -6.73e-07   erg/cm2
      90%_error_hi   7.97e-08  7.54e-08  1.37e-07  6.25e-07  3.15e-07  7.47e-07   erg/cm2
Peak flux       PL   2.57e-01  2.97e-01  2.47e-01  3.45e-01  9.25e-01  1.15e+00   ph/cm2/s
      90%_error_low -9.07e-02 -6.78e-02 -5.99e-02 -1.50e-01 -1.85e-01 -2.35e-01   ph/cm2/s
      90%_error_hi   1.02e-01  6.56e-02  5.81e-02  2.10e-01  1.85e-01  2.43e-01   ph/cm2/s
 
Fluence        CPL   6.86e-07  1.10e-06  1.15e-06  1.23e-06  3.52e-06  4.17e-06   erg/cm2
      90%_error_low -8.82e-08 -9.70e-08 -1.49e-07 -6.98e-07 -3.66e-07 -8.08e-07   erg/cm2
      90%_error_hi   8.88e-08  9.96e-08  1.46e-07  1.38e-06  3.74e-07  1.47e-06   erg/cm2
Peak flux      CPL   2.61e-01  2.97e-01  2.46e-01  3.49e-01  9.26e-01  1.15e+00   ph/cm2/s
      90%_error_low -1.30e-01 -6.74e-02 -5.88e-02     N/A   -1.96e-01 -3.64e-01   ph/cm2/s
      90%_error_hi   9.74e-02  7.36e-02  7.09e-02     N/A    1.84e-01  2.20e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
      220.0490   -26.6700   0.0178    28.1558  -109.5893         6.6201649     10.805 TRIG_00297628                 
     
    Foreground time interval of the image:
     -5.640 465.080 (delta_t = 470.720 [sec])
    Background time interval of the image:
    -139.995  -5.640 (delta_t = 134.355 [sec])
    




    Light Curves

    Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

    Full-time range; 1 s binning

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -5.640 sec. to  465.080 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.8599     ( -0.138648   0.134976 )
    Norm@50keV  : 8.48462E-04    ( -7.21817e-05   7.11485e-05 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          60.19 using 59 PHA bins.
    # Reduced chi-squared =          1.056 for     57 degrees of freedom 
    # Null hypothesis probability =   3.610211e-01
     
    Photon flux (15-150 keV)    in 470.7 sec: 0.119750 ( -0.008637  0.008643 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.67235e-06 ( -3.09912e-07  3.1454e-07 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -5.640 sec. to  465.080 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.47316     ( -0.473137   0.587533 )
    Epeak [keV] : 59.3183      ( -14.4825 -59.3183 )
    Norm@50keV  : 1.39502E-03    ( -0.000592837   0.00155217 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          58.58 using 59 PHA bins.
    # Reduced chi-squared =          1.046 for     56 degrees of freedom 
    # Null hypothesis probability =   3.811383e-01
     
    Photon flux (15-150 keV)    in 470.7 sec: 0.117434 ( -0.009159  0.009156 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.5158e-06 ( -3.66281e-07  3.73973e-07 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from    5.828 sec. to    6.828 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.26709     ( -0.363537   0.364407 )
    Norm@50keV  : 7.79913E-03    ( -0.00153072   0.00152747 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          65.15 using 59 PHA bins.
    # Reduced chi-squared =          1.143 for     57 degrees of freedom 
    # Null hypothesis probability =   2.142794e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.925058 ( -0.184654  0.185242 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 7.77159e-08 ( -1.72208e-08  1.74738e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    5.828 sec. to    6.828 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.26288     ( -2.40989   1.63331 )
    Epeak [keV] : 9996.89      ( -9997.37 -9997.37 )
    Norm@50keV  : 7.83364E-03    ( -0.00153989   0.0357947 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          65.15 using 59 PHA bins.
    # Reduced chi-squared =          1.163 for     56 degrees of freedom 
    # Null hypothesis probability =   1.883474e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.926099 ( -0.195795  0.184491 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 7.76945e-08 ( 0  0 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 408.08 sec.
    Hardness ratio (energy fluence ratio) = 1.1020212325
    

    S(15-50 keV) vs. S(50-150 keV) plot

    S(15-50 keV)  = 1.772371e-06
    S(50-150 keV) = 1.8999547e-06
    

    The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




    Mask shadow pattern

    IMX = -1.794401902565495E-01, IMY = 5.042252352474009E-01
    

    Spacecraft aspect plot

    Bright source in the pre-burst/pre-slew/post-slew images

    Pre-burst image of 15-350 keV band

    Time interval of the image:
    -139.995400 -5.640000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.0655 -60.6670    5.2  25.1   19.3  -0.3143  -2.2    7.8	Cen X-3                       
    186.7774 -62.7539    1.9  24.1   -0.2   0.8619   6.0    3.5	GX 301-2                      
    174.7389   6.0794    2.1  46.9  156.2   1.8194   5.4 ------	UNKNOWN                       
    152.4209 -58.3187    1.8  30.8   34.9   1.2001   6.3 ------	UNKNOWN                       
    213.6382  16.2495    3.3  59.4 -156.3   3.5860   3.4 ------	UNKNOWN                       
    

    Pre-slew background subtracted image of 15-350 keV band

    Time interval of the image:
    -5.640000 465.080000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    170.0382 -60.5985    5.6  25.0   19.4   1.0580   2.0    8.3	Cen X-3                       
    186.3672 -62.7208    5.2  24.1    0.2   1.1198   2.2    8.5	GX 301-2                      
    320.0690 -80.4188    2.7  57.8  -12.0  12.0988   4.3 ------	UNKNOWN                       
    220.0490 -26.6700    1.1  28.2 -109.6   6.6183  10.8 ------	UNKNOWN                       
    257.1073 -52.8438    2.1  47.3  -52.8  11.7422   5.6 ------	UNKNOWN                       
    237.7093 -28.2462    2.4  41.0  -93.3   8.6913   4.8 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image: