Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 06:04:32 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger517234
======================================================================

  Trigger: 00517234      Segment: 000

  BAT Trigger Time: 352880026.624   [s; MET]
      Trigger Stop: 352880030.72   [s; MET]
               UTC: 2012-03-08T06:13:38.654560    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 219.077930337103   Dec: 79.7034623843718  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.74
     Image Trigger?:     NO
     Rate S/N Ratio:     8.30662386291807  [ if not an image trigger ]
     Image S/N Ratio:    8.74

  Analysis Position:   [ source = BAT ]
    RA: 219.077930337103   Dec: 79.7034623843718  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 219.12266054142   Dec: 79.677734855378  [deg; J2000]  
        { 14h 36m 29.4s , +79d 40' 39.8" }
         +/- 1.31455536765174 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.425188706623284 [arcmin] (formal 1-sigma fit error)
    SNR: 20.5794735924838
 
  Angular difference between the analysis and refined position is 1.616649 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 61.2559999227524 +/- 16.8148358036733
        Measured from: -19.4639999866486
                   to: 41.7919999361038     [s; relative to TRIGTIME]
     T50: 23.1159999966621 +/- 3.68487558487293
        Measured from: -6.28400003910065
                   to: 16.8319999575615     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.624000012874603     
                   to: 1.6240000128746     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -24.7520000338554     
                   to: 58.2039999961853     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.667613   0.803141   0.502276   0.097781
           0.045030   0.047349   0.043354   0.041502 [error]
 Peak      0.023313   0.030163   0.019870   0.001468
           0.005007   0.005475   0.005001   0.004647 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   82.956  -24.752   58.204
T90    61.256  -19.464   41.792
T50    23.116   -6.284   16.832
Peak    1.000    0.624    1.624
 
 
====== 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      -1.719    -0.130      0.127       -           -               -         1.52e-03     -1.21e-04          1.20e-04      53.070   57
CPL     -1.095    -0.507      0.581       65.035     -14.143        80.572      3.34e-03     -1.55e-03          3.55e-03      48.520   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      -1.707     -0.408     0.374       -           -               -         4.48e-03     -1.16e-03          1.11e-03      68.960   57
CPL     -1.335     -1.071     1.997       76.369     -76.325       -76.369      7.33e-03     -7.33e-03          1.02e-01      68.790   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   1.98e-07  3.19e-07  3.88e-07  9.25e-07  1.17e-06  1.83e-06   erg/cm2
      90%_error_low -2.12e-08 -2.22e-08 -4.20e-08 -1.91e-07 -9.72e-08 -2.33e-07   erg/cm2
      90%_error_hi   2.17e-08  2.22e-08  4.23e-08  2.23e-07  9.87e-08  2.59e-07   erg/cm2
Peak flux       PL   2.25e-01  2.00e-01  1.23e-01  1.14e-01  5.96e-01  6.62e-01   ph/cm2/s
      90%_error_low -6.76e-02 -4.22e-02 -4.06e-02 -5.97e-02 -1.26e-01 -1.46e-01   ph/cm2/s
      90%_error_hi   7.12e-02  4.22e-02  4.13e-02  8.97e-02  1.26e-01  1.50e-01   ph/cm2/s
 
Fluence        CPL   1.84e-07  3.42e-07  3.86e-07  3.45e-07  1.09e-06  1.26e-06   erg/cm2
      90%_error_low -2.45e-08 -2.86e-08 -4.71e-08 -1.79e-07 -1.11e-07 -2.14e-07   erg/cm2
      90%_error_hi   2.47e-08  2.94e-08  4.63e-08  4.04e-07  1.14e-07  4.15e-07   erg/cm2
Peak flux      CPL   2.17e-01  2.10e-01  1.23e-01  6.60e-02  5.89e-01  6.16e-01   ph/cm2/s
      90%_error_low -7.64e-02 -5.04e-02 -4.75e-02 -6.60e-02 -1.30e-01 -1.53e-01   ph/cm2/s
      90%_error_hi   7.63e-02  6.05e-02  4.41e-02  6.54e-02  1.30e-01  1.89e-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
  219.1227    79.6777   0.0093    19.8523   -28.6161         1.8948941     20.579 TRIG_00517234                 
 
Foreground time interval of the image:
-24.752  35.877 (delta_t =  60.629 [sec])
Background time interval of the image:
-239.624 -24.752 (delta_t = 214.872 [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  -24.752 sec. to   58.204 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71877     ( -0.13013   0.127256 )
Norm@50keV  : 1.52465E-03    ( -0.000121361   0.000119971 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.07 using 59 PHA bins.
# Reduced chi-squared =         0.9310 for     57 degrees of freedom 
# Null hypothesis probability =   6.233013e-01
 
Photon flux (15-150 keV)    in 82.96 sec: 0.203846 ( -0.014245  0.014249 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16963e-06 ( -9.72233e-08  9.87207e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -24.752 sec. to   58.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09529     ( -0.507256   0.581077 )
Epeak [keV] : 65.0351      ( -14.1435 80.5721 )
Norm@50keV  : 3.33995E-03    ( -0.00154588   0.00354594 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.52 using 59 PHA bins.
# Reduced chi-squared =         0.8664 for     56 degrees of freedom 
# Null hypothesis probability =   7.510014e-01
 
Photon flux (15-150 keV)    in 82.96 sec: 0.197629 ( -0.015055  0.015057 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09423e-06 ( -1.1129e-07  1.14327e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.624 sec. to    1.624 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70676     ( -0.40814   0.373793 )
Norm@50keV  : 4.47972E-03    ( -0.00116422   0.00111349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.96 using 59 PHA bins.
# Reduced chi-squared =          1.210 for     57 degrees of freedom 
# Null hypothesis probability =   1.331063e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.596394 ( -0.125695  0.125703 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.14629e-08 ( -1.09116e-08  1.14218e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.624 sec. to    1.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33483     ( -1.07114   1.99716 )
Epeak [keV] : 76.3689      ( -76.3249 -76.3689 )
Norm@50keV  : 7.32874E-03    ( -0.00732874   0.102406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.79 using 59 PHA bins.
# Reduced chi-squared =          1.228 for     56 degrees of freedom 
# Null hypothesis probability =   1.172487e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.588502 ( -0.129571  0.1295 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.96333e-08 ( -1.23875e-08  1.28305e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 61.256 sec.
Hardness ratio (energy fluence ratio) = 1.21526198291

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

    S(15-50 keV)  = 5.174588e-07
S(50-150 keV) = 6.52176e-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 = 3.169507521572804E-01, IMY = 1.729227277776173E-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:
-239.624000 -24.752000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
119.5113  29.0995    2.9  43.4  160.5   3.1401   4.1 ------	UNKNOWN                       
181.6244  64.0018    3.3  13.7   37.3   1.0944   3.5 ------	UNKNOWN                       
273.5135  47.6238    3.4  56.4  -16.5   4.0004   3.4 ------	UNKNOWN                       
 42.9076  71.6806    2.4  31.2  -94.0   2.1690   4.7 ------	UNKNOWN                       
348.6917  67.7828    3.4  42.5  -69.2   4.8346   3.4 ------	UNKNOWN

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

    Time interval of the image:
-24.752000 35.876600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
108.8372  29.2816    1.8  46.0  173.2   1.2152   6.4 ------	UNKNOWN                       
229.5714  61.6525    2.2  31.8    4.3   0.5931   5.2 ------	UNKNOWN                       
219.1226  79.6777    0.6  19.9  -28.6   1.8951  20.6 ------	UNKNOWN                       
264.3770  43.0810    2.7  58.3   -7.4   2.3159   4.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
81.076600 962.389400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5862  35.3309   20.2  46.5   -1.7  -0.5422  -0.6    6.3	Her X-1                       
244.1700  26.7860    3.2  54.0   11.1   6.3867   3.6 ------	UNKNOWN                       
128.2402  74.0845    2.7  19.0  161.8   1.8933   4.3 ------	UNKNOWN                       
 40.5183  47.1049    2.9  53.2 -142.2  10.8523   3.9 ------	UNKNOWN                       
 24.5181  52.1135    2.5  47.9 -129.0   9.6344   4.6 ------	UNKNOWN