Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 13:48:32 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger228316
======================================================================

  Trigger: 00228316      Segment: 000

  BAT Trigger Time: 179224368   [s; MET]
      Trigger Stop: 179224432   [s; MET]
               UTC: 2006-09-06T08:32:46.573080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 40.7485000090217   Dec: 30.3494020585399  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.96
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.96

  Analysis Position:   [ source = BAT ]
    RA: 40.7485000090217   Dec: 30.3494020585399  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 40.7119716223741   Dec: 30.3561616373423  [deg; J2000]  
        { 02h 42m 50.9s , +30d 21' 22.2" }
         +/- 2.30678805573973 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.00649717813953 [arcmin] (formal 1-sigma fit error)
    SNR: 9.2158619370197
 
  Angular difference between the analysis and refined position is 1.934285 arcmin
 
  Partial Coding Fraction: 0.453125    [ including projection effects ]

  Duration
     T90: 44.5879999995232 +/- 2.59449571961208
        Measured from: -39.9280000030994
                   to: 4.65999999642372     [s; relative to TRIGTIME]
     T50: 17.0960000157356 +/- 2.35680543187746
        Measured from: -32.3000000119209
                   to: -15.2039999961853     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -24.8120000064373     
                   to: -23.8120000064373     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -41.7960000038147     
                   to: 8.30000001192093     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.317647   1.496176   0.845607   0.203501
           0.066231   0.069054   0.059785   0.050217 [error]
 Peak      0.073020   0.083412   0.053519   0.001752
           0.009681   0.010371   0.008645   0.006966 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   50.096  -41.796    8.300
T90    44.588  -39.928    4.660
T50    17.096  -32.300  -15.204
Peak    1.000  -24.812  -23.812
 
 
====== 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      -1.979    -0.105      0.102       -           -               -         4.95e-03     -3.13e-04          3.10e-04      56.530   57
CPL     -1.550    -0.405      0.450       47.803     -18.967        42.777      8.44e-03     -3.28e-03          6.23e-03      53.230   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      -1.997     -0.259     0.239       -           -               -         1.32e-02     -2.24e-03          2.17e-03      66.830   57
CPL     -1.533     -0.611     1.163       44.608      N/A           N/A         2.40e-02        N/A               N/A         66.170   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   4.98e-07  6.84e-07  6.94e-07  1.28e-06  2.29e-06  3.16e-06   erg/cm2
      90%_error_low -4.25e-08 -3.75e-08 -5.98e-08 -2.13e-07 -1.39e-07 -2.75e-07   erg/cm2
      90%_error_hi   4.35e-08  3.75e-08  6.01e-08  2.40e-07  1.39e-07  2.93e-07   erg/cm2
Peak flux       PL   8.78e-01  6.59e-01  3.30e-01  2.37e-01  1.98e+00  2.10e+00   ph/cm2/s
      90%_error_low -1.69e-01 -8.96e-02 -7.21e-02 -8.62e-02 -2.71e-01 -2.87e-01   ph/cm2/s
      90%_error_hi   1.76e-01  8.96e-02  7.22e-02  1.10e-01  2.71e-01  2.87e-01   ph/cm2/s
 
Fluence        CPL   4.70e-07  7.15e-07  6.96e-07  6.59e-07  2.20e-06  2.54e-06   erg/cm2
      90%_error_low -4.96e-08 -4.75e-08 -6.44e-08 -2.93e-07 -1.58e-07 -3.39e-07   erg/cm2
      90%_error_hi   5.03e-08  4.85e-08  6.41e-08  5.70e-07  1.59e-07  5.83e-07   erg/cm2
Peak flux      CPL   8.34e-01  6.98e-01  3.36e-01  1.34e-01  1.95e+00  2.00e+00   ph/cm2/s
      90%_error_low -1.96e-01 -1.50e-01 -7.83e-02 -1.34e-01 -2.77e-01 -3.03e-01   ph/cm2/s
      90%_error_hi   9.74e-02  1.24e-01  7.90e-02  1.78e-01  2.76e-01  3.62e-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
   40.7120    30.3562   0.0208    35.2814   152.1794         0.4788870      9.216 TRIG_00228316                 
 
Foreground time interval of the image:
 -6.499   8.300 (delta_t =  14.799 [sec])
Background time interval of the image:




    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  -41.796 sec. to    8.300 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.97866     ( -0.104827   0.102378 )
Norm@50keV  : 4.95226E-03    ( -0.000313358   0.000310094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.53 using 59 PHA bins.
# Reduced chi-squared =         0.9917 for     57 degrees of freedom 
# Null hypothesis probability =   4.927135e-01
 
Photon flux (15-150 keV)    in 50.1 sec: 0.735696 ( -0.041815  0.041895 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.28606e-06 ( -1.38541e-07  1.39473e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -41.796 sec. to    8.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.54954     ( -0.4051   0.449706 )
Epeak [keV] : 47.8026      ( -18.9669 42.7773 )
Norm@50keV  : 8.44215E-03    ( -0.0032753   0.006227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.23 using 59 PHA bins.
# Reduced chi-squared =         0.9506 for     56 degrees of freedom 
# Null hypothesis probability =   5.802361e-01
 
Photon flux (15-150 keV)    in 50.1 sec: 0.719271 ( -0.044449  0.0445 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20413e-06 ( -1.58078e-07  1.5867e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  -24.812 sec. to  -23.812 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.99727     ( -0.258626   0.238758 )
Norm@50keV  : 1.32002E-02    ( -0.00223911   0.00216705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.83 using 59 PHA bins.
# Reduced chi-squared =          1.172 for     57 degrees of freedom 
# Null hypothesis probability =   1.752132e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.97769 ( -0.27082  0.27095 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21733e-07 ( -1.92552e-08  1.95533e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -24.812 sec. to  -23.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53341     ( -0.611263   1.1633 )
Epeak [keV] : 44.6084      (   )
Norm@50keV  : 2.40109E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.17 using 59 PHA bins.
# Reduced chi-squared =          1.182 for     56 degrees of freedom 
# Null hypothesis probability =   1.659052e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.95248 ( -0.27654  0.27593 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = -6.257692935479964E-01, IMY = -3.302189153698654E-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:

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

    Time interval of the image:
-6.499390 8.300000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6023  22.0158    1.0  33.6 -135.2   0.5580  11.8    1.7	Crab                          
 24.9675 -22.7287    2.2  39.1   52.3   0.4801   5.4 ------	UNKNOWN                       
 40.7120  30.3562    1.2  35.3  152.2   0.4788   9.2 ------	UNKNOWN                       
 65.6703 -45.3591    2.0  45.1   -8.4   0.3549   5.8 ------	UNKNOWN                       
 99.0355   1.6719    3.0  40.9  -94.5   0.5356   3.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
132.500590 263.982600
265.000000 963.063900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6376  22.0286    0.4  39.1  -63.4  33.8794  28.4    0.9	Crab                          
351.2122  47.7272    2.8  41.4  154.0   3.6969   4.2 ------	UNKNOWN                       
 48.2942  23.7899    3.2   9.4  -22.6   1.3391   3.6 ------	UNKNOWN                       
 67.4112 -12.0716    2.7  49.6  -10.4   3.6140   4.2 ------	UNKNOWN                       
 76.0150   6.2449    2.7  40.9  -36.3   2.9755   4.3 ------	UNKNOWN                       
 84.4126  -4.5530    4.2  54.4  -33.0   6.2117   2.7 ------	UNKNOWN