Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Mar 17 19:01:50 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger670800
======================================================================

  Trigger: 00670800      Segment: 000

  BAT Trigger Time: 474731983.36   [s; MET]
      Trigger Stop: 474731984.384   [s; MET]
               UTC: 2016-01-17T13:59:27.649320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 132.190488716105   Dec: -16.3400348873399  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.06
     Image Trigger?:     NO
     Rate S/N Ratio:     11.4455231422596  [ if not an image trigger ]
     Image S/N Ratio:    7.06

  Analysis Position:   [ source = BAT ]
    RA: 132.190488716105   Dec: -16.3400348873399  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 132.170487312476   Dec: -16.3432403732475  [deg; J2000]  
        { 08h 48m 40.9s , -16d 20' 35.7" }
         +/- 1.46484935781316 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.52363524188656 [arcmin] (formal 1-sigma fit error)
    SNR: 17.630770291536
 
  Angular difference between the analysis and refined position is 1.167552 arcmin
 
  Partial Coding Fraction: 0.9375    [ including projection effects ]

  Duration
     T90: 11.5359999537468 +/- 2.60802764034251
        Measured from: 0.367999970912933
                   to: 11.9039999246597     [s; relative to TRIGTIME]
     T50: 3.05199992656708 +/- 2.28039291133579
        Measured from: 2.05199998617172
                   to: 5.1039999127388     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.17199999094009     
                   to: 3.17199999094009     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0199999809265137     
                   to: 14.472000002861     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.319477   0.283244   0.114536   0.006300
           0.025141   0.025535   0.021227   0.018047 [error]
 Peak      0.083649   0.086467   0.036505   0.007199
           0.007572   0.007853   0.006098   0.004590 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   14.452    0.020   14.472
T90    11.536    0.368   11.904
T50     3.052    2.052    5.104
Peak    1.000    2.172    3.172
 
 
====== 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      -2.285    -0.219      0.204       -           -               -         2.45e-03     -3.76e-04          3.69e-04      52.280   57
CPL     -1.778    -0.219      1.099       16.149     -15.591        23.598      5.08e-03     -5.08e-03          2.05e-02      51.240   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      -2.026     -0.196     0.186       -           -               -         1.14e-02     -1.50e-03          1.47e-03      65.300   57
CPL     -1.437     -0.698     1.150       38.142      N/A           N/A         2.56e-02        N/A               N/A         63.920   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   9.51e-08  1.09e-07  8.92e-08  1.23e-07  3.38e-07  4.16e-07   erg/cm2
      90%_error_low -1.24e-08 -1.17e-08 -1.83e-08 -4.24e-08 -4.20e-08 -6.80e-08   erg/cm2
      90%_error_hi   1.26e-08  1.16e-08  1.92e-08  5.58e-08  4.32e-08  7.81e-08   erg/cm2
Peak flux       PL   7.78e-01  5.75e-01  2.82e-01  1.97e-01  1.73e+00  1.83e+00   ph/cm2/s
      90%_error_low -1.12e-01 -5.92e-02 -4.82e-02 -5.74e-02 -1.78e-01 -1.89e-01   ph/cm2/s
      90%_error_hi   1.15e-01  5.91e-02  4.89e-02  7.02e-02  1.78e-01  1.89e-01   ph/cm2/s
 
Fluence        CPL   9.29e-08  1.15e-07  8.24e-08  4.39e-08  3.17e-07  3.34e-07   erg/cm2
      90%_error_low -1.32e-08 -1.36e-08 -2.59e-08 -3.62e-08 -4.92e-08 -6.45e-08   erg/cm2
      90%_error_hi   1.25e-08  1.62e-08  2.27e-08  8.87e-08  5.12e-08  1.08e-07   erg/cm2
Peak flux      CPL   7.46e-01  6.18e-01  2.75e-01  8.39e-02  1.70e+00  1.72e+00   ph/cm2/s
      90%_error_low -1.24e-01 -8.40e-02 -6.39e-02 -8.39e-02 -1.84e-01 -2.00e-01   ph/cm2/s
      90%_error_hi   1.24e-01  9.13e-02  5.47e-02  1.66e-01  1.83e-01  2.44e-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
  132.1705   -16.3432   0.0109    12.3190   124.3787         0.6975210     17.631 TRIG_00670800                 
 
Foreground time interval of the image:
  0.020  10.941 (delta_t =  10.921 [sec])
Background time interval of the image:
-728.859 -709.246 (delta_t =  19.613 [sec])
-239.360   0.020 (delta_t = 239.380 [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    0.020 sec. to   14.472 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.28512     ( -0.218687   0.203745 )
Norm@50keV  : 2.45111E-03    ( -0.000375634   0.000369281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.28 using 59 PHA bins.
# Reduced chi-squared =         0.9173 for     57 degrees of freedom 
# Null hypothesis probability =   6.523348e-01
 
Photon flux (15-150 keV)    in 14.45 sec: 0.424883 ( -0.042257  0.042257 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.37627e-07 ( -4.19499e-08  4.32175e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.020 sec. to   14.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.77786     ( -0.22099   1.09698 )
Epeak [keV] : 16.1491      ( -15.6995 23.4895 )
Norm@50keV  : 5.07737E-03    ( -0.00510034   0.0204349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.24 using 59 PHA bins.
# Reduced chi-squared =         0.9150 for     56 degrees of freedom 
# Null hypothesis probability =   6.552671e-01
 
Photon flux (15-150 keV)    in 14.45 sec: 0.417151 ( -0.043925  0.043803 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.17299e-07 ( -4.92414e-08  5.12268e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.172 sec. to    3.172 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.02596     ( -0.195725   0.185595 )
Norm@50keV  : 1.13811E-02    ( -0.00150172   0.0014686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.30 using 59 PHA bins.
# Reduced chi-squared =          1.146 for     57 degrees of freedom 
# Null hypothesis probability =   2.105032e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.72800 ( -0.17787  0.17791 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.05133e-07 ( -1.28355e-08  1.3065e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.172 sec. to    3.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43742     ( -0.700244   1.14861 )
Epeak [keV] : 38.1416      (   )
Norm@50keV  : 2.55914E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.92 using 59 PHA bins.
# Reduced chi-squared =          1.141 for     56 degrees of freedom 
# Null hypothesis probability =   2.183001e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.69676 ( -0.18444  0.18347 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 11.536 sec.
Hardness ratio (energy fluence ratio) = 0.820710627312

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

    S(15-50 keV)  = 2.0380744e-07
S(50-150 keV) = 1.3382148e-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 = -1.233120555355369E-01, IMY = -1.802365736885335E-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:
-728.859370 -709.246000
-239.360000 0.020000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4825 -40.5198    1.9  13.0  -87.0   1.4148   6.1    3.0	Vela X-1                      
 87.7110 -15.2716    3.4  40.9   32.8   1.7018   3.4 ------	UNKNOWN                       
178.1922  -0.4007    3.5  54.1 -179.4   3.2221   3.3 ------	UNKNOWN                       
113.0676 -43.6030    2.6  20.2  -30.0   1.0636   4.4 ------	UNKNOWN                       
188.2774 -11.3236    3.2  57.1 -161.7   4.3225   3.6 ------	UNKNOWN                       
190.7842 -12.5442    3.4  58.8 -159.2   6.2800   3.4 ------	UNKNOWN

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

    Time interval of the image:
0.020000 10.940600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4177 -40.6336    6.7  13.1  -86.6  -0.0744  -1.7    6.9	Vela X-1                      
159.4470   2.1045    2.5  41.8  161.2   0.3792   4.6 ------	UNKNOWN                       
132.1712 -16.3427    0.7  12.3  124.4   0.6954  17.6 ------	UNKNOWN                       
168.6909  -7.9452    2.2  42.1 -178.4   0.3491   5.2 ------	UNKNOWN                       
 69.3943 -51.7204    2.8  49.9  -22.2   0.3701   4.2 ------	UNKNOWN                       
140.2822 -68.2415    2.1  40.3  -73.0   0.7187   5.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
44.140620 838.585900
840.640000 962.680000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4329 -40.5418    1.8  24.3  -76.0   4.7432   6.5    4.4	Vela X-1                      
 92.4733  -4.0935    2.8  40.9   33.0   4.4669   4.1 ------	UNKNOWN                       
 79.2750 -18.5847    3.1  50.3    9.1   5.3358   3.8 ------	UNKNOWN                       
164.3697  -3.6151    2.8  34.1 -178.5   3.0126   4.2 ------	UNKNOWN                       
159.9292 -32.0413    2.9  29.6 -123.0   2.9901   3.9 ------	UNKNOWN                       
170.4299 -44.4805    3.3  42.7 -110.7  10.1817   3.5 ------	UNKNOWN