Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 15:58:26 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger213180
======================================================================

  Trigger: 00213180      Segment: 000

  BAT Trigger Time: 170976733.696   [s; MET]
      Trigger Stop: 170976745.856   [s; MET]
               UTC: 2006-06-02T21:32:12.464320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 149.575786869351   Dec: 0.323047531306239  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.58
     Image Trigger?:     NO
     Rate S/N Ratio:     13.114877048604  [ if not an image trigger ]
     Image S/N Ratio:    7.58

  Analysis Position:   [ source = BAT ]
    RA: 149.575786869351   Dec: 0.323047531306239  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 149.581087427649   Dec: 0.312297003143231  [deg; J2000]  
        { 09h 58m 19.5s , +00d 18' 44.3" }
         +/- 1.63066818162102 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.539421897373349 [arcmin] (formal 1-sigma fit error)
    SNR: 15.1265175477959
 
  Angular difference between the analysis and refined position is 0.719172 arcmin
 
  Partial Coding Fraction: 0.4375    [ including projection effects ]

  Duration
     T90: 74.8360000252724 +/- 12.9564144895898
        Measured from: 4.47599998116493
                   to: 79.3120000064373     [s; relative to TRIGTIME]
     T50: 33.2760000228882 +/- 10.7849999389585
        Measured from: 15.8559999763966
                   to: 49.1319999992847     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.92800000309944     
                   to: 5.92800000309944     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 2.12000000476837     
                   to: 84.7439999878407     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.423949   0.786157   0.790646   0.274803
           0.069497   0.072789   0.065883   0.059487 [error]
 Peak      0.026597   0.019483   0.011642   0.020098
           0.007695   0.008030   0.007577   0.006825 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   82.624    2.120   84.744
T90    74.836    4.476   79.312
T50    33.276   15.856   49.132
Peak    1.000    4.928    5.928
 
 
====== 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      -1.219    -0.159      0.162       -           -               -         1.93e-03     -1.81e-04          1.81e-04      48.160   57
CPL     -0.743    -0.597      0.738      147.502     -58.450      -147.502      3.19e-03     -1.36e-03          3.54e-03      46.540   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.820     -1.091     0.894       -           -               -         4.05e-03     -2.23e-03          1.78e-03      83.460   57
CPL     -1.841     -1.075     0.919     9999.360      N/A           N/A         4.02e-03        N/A               N/A         83.470   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   1.57e-07  3.42e-07  5.88e-07  2.34e-06  1.61e-06  3.42e-06   erg/cm2
      90%_error_low -2.83e-08 -3.86e-08 -6.17e-08 -5.02e-07 -1.57e-07 -5.43e-07   erg/cm2
      90%_error_hi   3.00e-08  3.81e-08  6.12e-08  5.93e-07  1.58e-07  6.16e-07   erg/cm2
Peak flux       PL   2.27e-01  1.89e-01  1.07e-01  8.94e-02  5.62e-01  6.12e-01   ph/cm2/s
      90%_error_low -2.27e-01 -7.41e-02 -1.07e-01 -8.94e-02 -2.12e-01 -2.32e-01   ph/cm2/s
      90%_error_hi   1.57e-01  7.06e-02  6.86e-02  1.99e-01  2.12e-01  2.35e-01   ph/cm2/s
 
Fluence        CPL   1.41e-07  3.55e-07  6.18e-07  1.29e-06  1.58e-06  2.40e-06   erg/cm2
      90%_error_low -3.48e-08 -4.29e-08 -7.30e-08 -6.58e-07 -1.68e-07 -6.68e-07   erg/cm2
      90%_error_hi   3.64e-08  4.40e-08  7.49e-08  1.24e-06  1.67e-07  1.25e-06   erg/cm2
Peak flux      CPL   2.04e-01  1.47e-01  7.36e-02  6.15e-02  4.50e-01  4.86e-01   ph/cm2/s
      90%_error_low -1.52e-01 -1.47e-01 -7.36e-02 -6.15e-02     N/A       N/A     ph/cm2/s
      90%_error_hi   1.63e-01  1.05e-01  5.79e-02  4.49e-02     N/A       N/A     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
  149.5811     0.3123   0.0127    44.5312    -7.6983         2.3504585     15.127 TRIG_00213180                 
 
Foreground time interval of the image:
  2.120  84.744 (delta_t =  82.624 [sec])
Background time interval of the image:
-239.696   2.120 (delta_t = 241.816 [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    2.120 sec. to   84.744 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21898     ( -0.158633   0.16236 )
Norm@50keV  : 1.93227E-03    ( -0.000181364   0.000180787 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.16 using 59 PHA bins.
# Reduced chi-squared =         0.8449 for     57 degrees of freedom 
# Null hypothesis probability =   7.915019e-01
 
Photon flux (15-150 keV)    in 82.62 sec: 0.227434 ( -0.022605  0.022707 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.6113e-06 ( -1.57327e-07  1.581e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.120 sec. to   84.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.743235     ( -0.596817   0.738256 )
Epeak [keV] : 147.502      ( -58.4506 -147.503 )
Norm@50keV  : 3.19389E-03    ( -0.00135802   0.00353608 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.54 using 59 PHA bins.
# Reduced chi-squared =         0.8311 for     56 degrees of freedom 
# Null hypothesis probability =   8.120494e-01
 
Photon flux (15-150 keV)    in 82.62 sec: 0.222820 ( -0.023458  0.023517 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.57516e-06 ( -1.68317e-07  1.66589e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    4.928 sec. to    5.928 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.82008     ( -1.08914   0.895222 )
Norm@50keV  : 4.04773E-03    ( -0.00222224   0.00178186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          83.46 using 59 PHA bins.
# Reduced chi-squared =          1.464 for     57 degrees of freedom 
# Null hypothesis probability =   1.272842e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.562293 ( -0.211992  0.211564 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.72092e-08 ( -1.75004e-08  1.84145e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    4.928 sec. to    5.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.84136     ( -1.07525   0.918566 )
Epeak [keV] : 9999.36      (   )
Norm@50keV  : 4.01861E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          83.47 using 59 PHA bins.
# Reduced chi-squared =          1.490 for     56 degrees of freedom 
# Null hypothesis probability =   1.008958e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.450446 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 74.836 sec.
Hardness ratio (energy fluence ratio) = 1.71842305481

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

    S(15-50 keV)  = 4.990155e-07
S(50-150 keV) = 1.1122836e-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 = 9.749022316571209E-01, IMY = 1.317822286971807E-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:
-239.696000 2.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5147 -40.7371    6.2   9.9   68.3   0.2890   1.8   11.0	Vela X-1                      
170.3212 -60.6127  120.5  37.4   97.6   0.0444   0.1    0.6	Cen X-3                       
164.4566 -33.9029    2.7  33.2   50.5   1.0549   4.2 ------	UNKNOWN                       
165.6946 -14.1345    3.2  43.9   23.4   1.1094   3.6 ------	UNKNOWN

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

    Time interval of the image:
2.120000 84.744000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4961 -40.3482   49.3   9.8   66.2   0.0213   0.2   12.5	Vela X-1                      
170.1575 -60.6746    7.5  37.3   97.7  -0.4220  -1.5    5.6	Cen X-3                       
166.3695 -60.5798    2.2  35.6   98.6   1.1109   5.3 ------	UNKNOWN                       
149.5811   0.3123    0.8  44.5   -7.7   2.3503  15.1 ------	UNKNOWN                       
134.5775   6.3242    2.3  44.7  -30.7   0.9154   4.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
550.604600 722.312500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
215.6068  22.7008    3.6  40.7   71.4   5.4195   3.2 ------	UNKNOWN                       
171.4529  44.5886    3.3   9.6  -21.7   1.3387   3.5 ------	UNKNOWN                       
150.1703  18.5275    2.9  24.7 -150.4   1.6816   4.0 ------	UNKNOWN