Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue May 26 22:38:36 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger456967
======================================================================

  Trigger: 00456967      Segment: 000

  BAT Trigger Time: 331939966.976   [s; MET]
      Trigger Stop: 331939968   [s; MET]
               UTC: 2011-07-09T21:32:39.835840    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 164.614495443872   Dec: -23.4839881602794  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.39
     Image Trigger?:     NO
     Rate S/N Ratio:     12.4899959967968  [ if not an image trigger ]
     Image S/N Ratio:    7.39

  Analysis Position:   [ source = BAT ]
    RA: 164.614495443872   Dec: -23.4839881602794  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 164.668326775659   Dec: -23.4698929670294  [deg; J2000]  
        { 10h 58m 40.4s , -23d 28' 11.6" }
         +/- 1.05926852212273 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.346104897152091 [arcmin] (formal 1-sigma fit error)
    SNR: 28.0153096825351
 
  Angular difference between the analysis and refined position is 3.080861 arcmin
 
  Partial Coding Fraction: 0.578125    [ including projection effects ]

  Duration
     T90: 810.471999943256 +/- 10.4116434855617
        Measured from: 0.108000099658966
                   to: 810.580000042915     [s; relative to TRIGTIME]
     T50: 629.391999959946 +/- 2.30903963424052
        Measured from: 24.8720000982285
                   to: 654.264000058174     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 646.611999988556     
                   to: 647.611999988556     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -27.3600000143051     
                   to: 855.487999975681     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     9.382273  13.282414  11.081025   2.977319
           0.178073   0.185981   0.168073   0.149592 [error]
 Peak      0.118890   0.175016   0.160770   0.047459
           0.007545   0.008589   0.008161   0.006287 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  882.848  -27.360  855.488
T90   810.472    0.108  810.580
T50   629.392   24.872  654.264
Peak    1.000  646.612  647.612
 
 
====== 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      -1.389    -0.038      0.038       -           -               -         2.74e-03     -5.29e-05          5.29e-05      41.140   57
CPL     -1.252    -0.067      0.152      315.802    -134.434      -315.802      3.14e-03     -4.09e-04          4.98e-04      38.620   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      -1.262     -0.092     0.092       -           -               -         3.20e-02     -1.69e-03          1.69e-03      58.480   57
CPL     -0.946     -0.344     0.378      175.264     -68.290      -175.264      4.55e-02     -1.40e-02          2.31e-02      56.070   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   2.78e-06  5.47e-06  8.36e-06  2.78e-05  2.34e-05  4.44e-05   erg/cm2
      90%_error_low -1.17e-07 -1.32e-07 -1.86e-07 -1.47e-06 -4.64e-07 -1.54e-06   erg/cm2
      90%_error_hi   1.19e-07  1.32e-07  1.86e-07  1.52e-06  4.65e-07  1.58e-06   erg/cm2
Peak flux       PL   1.05e+00  1.21e+00  1.01e+00  1.42e+00  3.79e+00  4.70e+00   ph/cm2/s
      90%_error_low -1.00e-01 -7.18e-02 -6.50e-02 -1.83e-01 -2.02e-01 -2.63e-01   ph/cm2/s
      90%_error_hi   1.03e-01  7.14e-02  6.47e-02  2.00e-01  2.02e-01  2.65e-01   ph/cm2/s
 
Fluence        CPL   2.68e-06  5.50e-06  8.46e-06  2.34e-05  2.32e-05  4.00e-05   erg/cm2
      90%_error_low -1.59e-07 -1.36e-07 -2.16e-07 -3.90e-06 -5.14e-07 -3.91e-06   erg/cm2
      90%_error_hi   1.62e-07  1.36e-07  2.17e-07  2.30e-06  5.13e-07  4.79e-06   erg/cm2
Peak flux      CPL   9.81e-01  1.25e+00  1.04e+00  9.96e-01  3.73e+00  4.27e+00   ph/cm2/s
      90%_error_low -1.22e-01 -8.04e-02 -7.39e-02 -3.13e-01 -2.10e-01 -3.85e-01   ph/cm2/s
      90%_error_hi   1.25e-01  8.16e-02  7.51e-02  4.41e-01  2.10e-01  5.02e-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
  164.6683   -23.4699   0.0069    28.6593   147.1709         5.8734534     28.015 TRIG_00456967                 
 
Foreground time interval of the image:
-27.360  12.925 (delta_t =  40.285 [sec])
Background time interval of the image:
-36.875 -27.360 (delta_t =   9.515 [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
    Multiple GTIs in the spectrum
tstart tstop
-27.360000 233.744000
235.024000 855.488000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38916     ( -0.0376513   0.0377154 )
Norm@50keV  : 2.74202E-03    ( -5.28932e-05   5.28642e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.14 using 59 PHA bins.
# Reduced chi-squared =         0.7217 for     57 degrees of freedom 
# Null hypothesis probability =   9.437783e-01
 
Photon flux (15-150 keV)    in 881.6 sec: 0.333120 ( -0.007318  0.007344 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34133e-05 ( -4.64384e-07  4.64931e-07 ) ergs/cm2
    Cutoff power-law model
    Multiple GTIs in the spectrum
tstart tstop
-27.360000 233.744000
235.024000 855.488000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25175     ( -0.0671064   0.152262 )
Epeak [keV] : 315.802      ( -134.431 -315.799 )
Norm@50keV  : 3.14271E-03    ( -0.000408901   0.000497663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.62 using 59 PHA bins.
# Reduced chi-squared =         0.6896 for     56 degrees of freedom 
# Null hypothesis probability =   9.630203e-01
 
Photon flux (15-150 keV)    in 881.6 sec: 0.329218 ( -0.008326  0.008371 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32082e-05 ( -5.13658e-07  5.12715e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  646.612 sec. to  647.612 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.26216     ( -0.0918243   0.0918341 )
Norm@50keV  : 3.19602E-02    ( -0.001688   0.00168611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.48 using 59 PHA bins.
# Reduced chi-squared =          1.026 for     57 degrees of freedom 
# Null hypothesis probability =   4.209157e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.78766 ( -0.2018  0.2019 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.18882e-07 ( -1.91452e-08  1.92529e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  646.612 sec. to  647.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.945692     ( -0.343957   0.378414 )
Epeak [keV] : 175.264      ( -68.2901 -175.264 )
Norm@50keV  : 4.55089E-02    ( -0.0140209   0.0230671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.07 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     56 degrees of freedom 
# Null hypothesis probability =   4.720617e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.73494 ( -0.21013  0.20989 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.11774e-07 ( -2.09234e-08  2.08396e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 810.472 sec.
Hardness ratio (energy fluence ratio) = 1.52717925775

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

    S(15-50 keV)  = 8.25404e-06
S(50-150 keV) = 1.5159427e-05

    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 = -4.592707663994564E-01, IMY = -2.963102109446565E-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:
-36.875410 -27.360000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3939 -40.5401    5.9  47.6 -173.9  -0.1258  -1.9    6.2	Vela X-1                      
187.5270   6.3924    2.3  32.5   69.6   0.3200   5.0 ------	UNKNOWN                       
175.0257  14.6479    2.5  22.6   45.4   0.1740   4.6 ------	UNKNOWN                       
168.5738  34.9461    2.2  33.8    6.2   0.2213   5.2 ------	UNKNOWN                       
115.4555  19.5574    2.4  41.7  -78.3   0.6203   4.9 ------	UNKNOWN

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

    Time interval of the image:
-27.360000 12.924600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4067 -40.5104    4.0  47.6 -173.9   0.8632   2.9    6.2	Vela X-1                      
190.0436   0.8073    2.3  35.1   79.6   1.9783   5.1 ------	UNKNOWN                       
164.6683 -23.4699    0.4  28.7  147.2   5.8732  28.0 ------	UNKNOWN                       
170.0483  34.0713    2.4  33.5    8.8   0.9487   4.8 ------	UNKNOWN                       
158.0200  15.2050    2.0  12.0   -0.0   0.8513   5.7 ------	UNKNOWN                       
133.8211 -41.9418    2.1  49.4 -173.4   1.8449   5.5 ------	UNKNOWN                       
148.6812  32.4947    2.8  29.5  -25.0   0.7091   4.2 ------	UNKNOWN                       
117.9939 -41.2975    2.4  56.1 -161.1   2.9372   4.7 ------	UNKNOWN                       
114.2589 -41.2543    2.2  58.2 -158.9   4.6951   5.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
68.924600 233.744000
235.024000 1285.694000
1287.024000 1548.096500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5647 -40.5695    0.9  29.8 -167.7  11.7935  12.4    1.9	Vela X-1                      
170.3688 -60.6139    1.8  37.3  139.6  11.8388   6.4    1.7	Cen X-3                       
186.7993 -62.7497    6.0  42.0  129.3   6.4736   1.9    4.1	GX 301-2                      
187.6919 -57.1223    3.4  37.5  123.9   7.8697   3.4 ------	UNKNOWN                       
204.8978 -13.1763    2.6  39.4   46.4   9.5855   4.4 ------	UNKNOWN                       
175.6448 -41.7341    3.0  20.4  120.2   3.9572   3.8 ------	UNKNOWN                       
193.7043   4.5495    3.6  39.9   13.3   4.6763   3.2 ------	UNKNOWN                       
154.5777 -39.6382    2.7  18.3  169.7   3.9454   4.2 ------	UNKNOWN                       
197.2291  21.8431    3.2  55.3    1.7  14.5867   3.6 ------	UNKNOWN                       
164.6585 -23.4562    0.4   0.0   -2.5  25.1609  26.0 ------	UNKNOWN                       
110.8739 -30.5827    2.7  48.0 -146.5   8.3652   4.3 ------	UNKNOWN                       
102.7020 -28.5964    6.7  55.3 -145.2  12.4943   1.7 ------	UNKNOWN                       
112.6008 -18.6085    3.0  48.6 -130.3  16.6039   3.9 ------	UNKNOWN