Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 16:32:58 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger432420
======================================================================

  Trigger: 00432420      Segment: 000

  BAT Trigger Time: 304277141.824   [s; MET]
      Trigger Stop: 304277142.848   [s; MET]
               UTC: 2010-08-23T17:25:35.715620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 20.7032249785858   Dec: 5.8420131400694  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.5
     Image Trigger?:     NO
     Rate S/N Ratio:     15.8429795177549  [ if not an image trigger ]
     Image S/N Ratio:    10.5

  Analysis Position:   [ source = BAT ]
    RA: 20.7032249785858   Dec: 5.8420131400694  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 20.7047693351404   Dec: 5.84732433240791  [deg; J2000]  
        { 01h 22m 49.1s , +05d 50' 50.4" }
         +/- 1.41283374432378 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.465102322787318 [arcmin] (formal 1-sigma fit error)
    SNR: 18.5653260677926
 
  Angular difference between the analysis and refined position is 0.331736 arcmin
 
  Partial Coding Fraction: 0.9296875    [ including projection effects ]

  Duration
     T90: 17.7359999418259 +/- 3.10168209249592
        Measured from: -0.452000021934509
                   to: 17.2839999198914     [s; relative to TRIGTIME]
     T50: 7.95199990272522 +/- 1.62941585249702
        Measured from: 1.18800002336502
                   to: 9.13999992609024     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.139999985694885     
                   to: 1.13999998569489     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.17199999094009     
                   to: 19.4120000004768     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.347463   0.300562   0.138145   0.043036
           0.023390   0.023966   0.020872   0.018419 [error]
 Peak      0.047644   0.041763   0.017171   0.009010
           0.005530   0.005631   0.004836   0.003947 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   20.584   -1.172   19.412
T90    17.736   -0.452   17.284
T50     7.952    1.188    9.140
Peak    1.000    0.140    1.140
 
 
====== 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      -2.168    -0.181      0.172       -           -               -         2.14e-03     -2.61e-04          2.56e-04      54.350   57
CPL     -1.823    -0.218      0.830       19.831     -19.222       -19.831      3.45e-03     -1.16e-03          7.62e-03      53.640   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      -2.138     -0.308     0.277       -           -               -         6.01e-03     -1.26e-03          1.21e-03      59.750   57
CPL     -2.204     -0.273     1.116      123.342      N/A           N/A         5.48e-03        N/A               N/A         59.730   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   1.06e-07  1.29e-07  1.15e-07  1.77e-07  4.11e-07  5.27e-07   erg/cm2
      90%_error_low -1.24e-08 -1.15e-08 -1.91e-08 -5.13e-08 -4.32e-08 -7.57e-08   erg/cm2
      90%_error_hi   1.26e-08  1.15e-08  1.97e-08  6.42e-08  4.43e-08  8.55e-08   erg/cm2
Peak flux       PL   4.58e-01  3.17e-01  1.44e-01  9.11e-02  9.63e-01  1.01e+00   ph/cm2/s
      90%_error_low -8.72e-02 -4.64e-02 -3.87e-02 -3.93e-02 -1.36e-01 -1.45e-01   ph/cm2/s
      90%_error_hi   8.93e-02  4.60e-02  4.02e-02  5.43e-02  1.36e-01  1.46e-01   ph/cm2/s
 
Fluence        CPL   1.03e-07  1.35e-07  1.11e-07  8.76e-08  3.94e-07  4.36e-07   erg/cm2
      90%_error_low -1.35e-08 -1.35e-08 -2.43e-08 -6.45e-08 -5.30e-08 -8.81e-08   erg/cm2
      90%_error_hi   1.30e-08  1.59e-08  2.19e-08  1.60e-07  5.36e-08  1.50e-07   erg/cm2
Peak flux      CPL   4.60e-01  3.14e-01  1.44e-01  1.03e-01  9.65e-01  1.02e+00   ph/cm2/s
      90%_error_low -9.16e-02 -7.35e-02     N/A   -5.03e-02 -2.20e-01 -3.33e-01   ph/cm2/s
      90%_error_hi   4.52e-02  4.85e-02     N/A    4.98e-02  1.36e-01  1.48e-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
   20.7048     5.8473   0.0104    23.9756  -174.5894         0.6624661     18.565 TRIG_00432420                 
 
Foreground time interval of the image:
 -1.172  10.877 (delta_t =  12.049 [sec])
Background time interval of the image:
-371.523 -324.793 (delta_t =  46.731 [sec])
-239.824  -1.172 (delta_t = 238.652 [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   -1.172 sec. to   19.412 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.16843     ( -0.181097   0.171717 )
Norm@50keV  : 2.13507E-03    ( -0.000260766   0.000255937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.35 using 59 PHA bins.
# Reduced chi-squared =         0.9535 for     57 degrees of freedom 
# Null hypothesis probability =   5.751408e-01
 
Photon flux (15-150 keV)    in 20.58 sec: 0.347737 ( -0.029891  0.029895 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.11468e-07 ( -4.3233e-08  4.42698e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.172 sec. to   19.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.82321     ( -0.218279   0.829354 )
Epeak [keV] : 19.8315      ( -19.2767 -19.8861 )
Norm@50keV  : 3.45387E-03    ( -0.00116413   0.00761867 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.64 using 59 PHA bins.
# Reduced chi-squared =         0.9578 for     56 degrees of freedom 
# Null hypothesis probability =   5.648802e-01
 
Photon flux (15-150 keV)    in 20.58 sec: 0.342723 ( -0.031438  0.030939 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.93909e-07 ( -5.29715e-08  5.3593e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.140 sec. to    1.140 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.13831     ( -0.307512   0.277482 )
Norm@50keV  : 6.00716E-03    ( -0.00125836   0.00121217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.75 using 59 PHA bins.
# Reduced chi-squared =          1.048 for     57 degrees of freedom 
# Null hypothesis probability =   3.762125e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.963437 ( -0.135876  0.135883 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.60493e-08 ( -1.00597e-08  1.04275e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.140 sec. to    1.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.20403     ( -0.271449   1.1169 )
Epeak [keV] : 123.342      (   )
Norm@50keV  : 5.48242E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.73 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     56 degrees of freedom 
# Null hypothesis probability =   3.418431e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.965042 ( -0.220383  0.136218 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 17.736 sec.
Hardness ratio (energy fluence ratio) = 0.889856212565

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

    S(15-50 keV)  = 2.349337e-07
S(50-150 keV) = 1.7653561e-07

    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 = -4.427365595017845E-01, IMY = 4.193319806749431E-02

    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:
-371.523400 -324.792700
-239.824000 -1.172000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
358.3073  -7.8609    3.0  25.8  120.3   0.9429   3.8  482.4	UNKNOWN                       
  5.9271  33.9219    3.0  54.4  173.0   3.2434   3.9 ------	UNKNOWN                       
 36.5532 -72.8597    2.6  55.4    5.2   3.9489   4.4 ------	UNKNOWN                       
 40.3658 -58.4445    2.9  42.4   -3.6   1.1347   4.0 ------	UNKNOWN                       
 36.0347 -51.2220    3.0  34.8   -4.6   0.8715   3.8 ------	UNKNOWN                       
 55.5336 -56.5210    2.4  45.7  -14.7   1.5182   4.9 ------	UNKNOWN

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

    Time interval of the image:
-1.172000 10.876600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 20.7048   5.8473    0.6  24.0 -174.6   0.6624  18.6 ------	UNKNOWN                       
 69.4656 -40.4824    2.2  45.9  -40.5   0.3933   5.2 ------	UNKNOWN                       
 47.3802  28.6389    2.8  52.5 -142.3   0.6665   4.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
58.076600 894.676600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
346.6945  -5.2013    3.0  35.7   92.6   3.6385   3.9 ------	UNKNOWN                       
 33.4360 -19.3554    3.0  28.1   -6.2   1.5051   3.8 ------	UNKNOWN                       
 56.5132 -34.9183    2.7  52.9  -17.0   3.9201   4.2 ------	UNKNOWN