Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Sep 10 22:16:07 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger540964
======================================================================

  Trigger: 00540964      Segment: 000

  BAT Trigger Time: 376783161.344   [s; MET]
      Trigger Stop: 376783162.368   [s; MET]
               UTC: 2012-12-09T21:59:11.377440    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 326.800843695798   Dec: -8.24449430194564  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.49
     Image Trigger?:     NO
     Rate S/N Ratio:     14.247806848775  [ if not an image trigger ]
     Image S/N Ratio:    7.49

  Analysis Position:   [ source = BAT ]
    RA: 326.800843695798   Dec: -8.24449430194564  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 326.794911400164   Dec: -8.25018008552619  [deg; J2000]  
        { 21h 47m 10.8s , -08d 15' 00.6" }
         +/- 1.46072326680557 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.621636544522112 [arcmin] (formal 1-sigma fit error)
    SNR: 17.7019582857983
 
  Angular difference between the analysis and refined position is 0.490373 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 42.9199999570847 +/- 1.4322011090572
        Measured from: -0.0199999809265137
                   to: 42.8999999761581     [s; relative to TRIGTIME]
     T50: 13.839999973774 +/- 1.7146941270136
        Measured from: 14.3880000114441
                   to: 28.227999985218     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 27.9079999923706     
                   to: 28.9079999923706     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.1599999666214     
                   to: 44.716000020504     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.063701   1.617946   1.307575   0.351335
           0.056003   0.058548   0.052810   0.046222 [error]
 Peak      0.063773   0.146847   0.163880   0.063184
           0.009138   0.010710   0.010538   0.008741 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   46.876   -2.160   44.716
T90    42.920   -0.020   42.900
T50    13.840   14.388   28.228
Peak    1.000   27.908   28.908
 
 
====== 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      -1.418    -0.076      0.076       -           -               -         6.35e-03     -2.61e-04          2.61e-04      38.040   57
CPL     -1.211    -0.239      0.306      203.943     -90.869      -203.943      7.96e-03     -1.75e-03          3.05e-03      36.540   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      -0.867     -0.127     0.130       -           -               -         2.95e-02     -2.22e-03          2.20e-03      64.730   57
CPL     -0.627     -0.299     0.530      336.866    -336.866      -336.866      3.75e-02     -9.70e-03          2.50e-02      64.000   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   3.52e-07  6.80e-07  1.02e-06  3.29e-06  2.87e-06  5.34e-06   erg/cm2
      90%_error_low -2.74e-08 -3.15e-08 -5.25e-08 -3.67e-07 -1.28e-07 -4.02e-07   erg/cm2
      90%_error_hi   2.82e-08  3.13e-08  5.23e-08  3.99e-07  1.29e-07  4.27e-07   erg/cm2
Peak flux       PL   6.64e-01  9.76e-01  1.07e+00  2.20e+00  3.38e+00  4.91e+00   ph/cm2/s
      90%_error_low -1.03e-01 -9.51e-02 -8.12e-02 -3.46e-01 -2.53e-01 -3.99e-01   ph/cm2/s
      90%_error_hi   1.09e-01  9.40e-02  8.09e-02  3.89e-01  2.53e-01  4.12e-01   ph/cm2/s
 
Fluence        CPL   3.37e-07  6.91e-07  1.03e-06  2.45e-06  2.83e-06  4.51e-06   erg/cm2
      90%_error_low -3.41e-08 -3.49e-08 -5.75e-08 -7.95e-07 -1.41e-07 -8.00e-07   erg/cm2
      90%_error_hi   3.48e-08  3.54e-08  5.83e-08  9.53e-07  1.41e-07  9.84e-07   erg/cm2
Peak flux      CPL   6.22e-01  9.88e-01  1.10e+00  1.73e+00  3.36e+00  4.44e+00   ph/cm2/s
      90%_error_low -1.29e-01 -9.95e-02 -1.01e-01 -6.42e-01 -2.58e-01 -6.91e-01   ph/cm2/s
      90%_error_hi   1.27e-01  1.01e-01  1.05e-01  5.92e-01  2.59e-01  6.82e-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
  326.7949    -8.2502   0.0108    33.2124   166.0428         1.1948487     17.702 TRIG_00540964                 
 
Foreground time interval of the image:
 -2.160  15.757 (delta_t =  17.917 [sec])
Background time interval of the image:
-239.344  -2.160 (delta_t = 237.184 [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   -2.160 sec. to   44.716 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41768     ( -0.0757357   0.0757698 )
Norm@50keV  : 6.35024E-03    ( -0.000261003   0.000260892 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.04 using 59 PHA bins.
# Reduced chi-squared =         0.6673 for     57 degrees of freedom 
# Null hypothesis probability =   9.749228e-01
 
Photon flux (15-150 keV)    in 46.88 sec: 0.776517 ( -0.033727  0.033801 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.86674e-06 ( -1.28142e-07  1.28546e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -2.160 sec. to   44.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21116     ( -0.239278   0.305763 )
Epeak [keV] : 203.943      ( -90.8681 -203.943 )
Norm@50keV  : 7.95522E-03    ( -0.00175416   0.00304637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.54 using 59 PHA bins.
# Reduced chi-squared =         0.6524 for     56 degrees of freedom 
# Null hypothesis probability =   9.795517e-01
 
Photon flux (15-150 keV)    in 46.88 sec: 0.766861 ( -0.036175  0.036215 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.82506e-06 ( -1.41399e-07  1.40712e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   27.908 sec. to   28.908 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.867029     ( -0.126652   0.130419 )
Norm@50keV  : 2.94757E-02    ( -0.00221729   0.00220381 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.73 using 59 PHA bins.
# Reduced chi-squared =          1.136 for     57 degrees of freedom 
# Null hypothesis probability =   2.248706e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.38298 ( -0.25267  0.25308 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.35151e-07 ( -2.60147e-08  2.61257e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   27.908 sec. to   28.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.626552     ( -0.298732   0.530298 )
Epeak [keV] : 336.866      ( -336.867 -336.867 )
Norm@50keV  : 3.75311E-02    ( -0.00969608   0.0249829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.00 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     56 degrees of freedom 
# Null hypothesis probability =   2.161362e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.35561 ( -0.25845  0.25864 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.31956e-07 ( -2.71946e-08  2.70073e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 42.92 sec.
Hardness ratio (energy fluence ratio) = 1.49730501919

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

    S(15-50 keV)  = 1.0319753e-06
S(50-150 keV) = 1.8347416e-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 = -6.353624374023616E-01, IMY = -1.579095246858080E-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:
-239.344000 -2.160000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4610  35.4092   20.6  47.9   -2.8   0.2514   0.6    4.0	Her X-1                       
268.3308  -1.6084    2.8  31.3  -61.2   1.2494   4.1    9.6	SW J1753.5-0127               
274.0263 -14.0587    1.9  32.9  -86.9   2.3702   6.1    1.8	GX 17+2                       
284.8408 -24.9035   52.1  35.8 -112.9  -0.0908  -0.2   10.7	HT1900.1-2455                 
288.7829  10.9876    2.5   9.4  -27.9   0.9342   4.6    2.7	GRS 1915+105                  
299.8220  35.1841    4.4  26.7   49.6   0.7866   2.6   11.4	Cyg X-1                       
308.1548  40.9209    3.4  33.6   60.3   1.4925   3.4    2.8	Cyg X-3                       
326.1810  38.3171   52.8  39.1   82.3  -0.2168  -0.2    0.5	Cyg X-2                       
279.4946  47.6687    2.5  42.2   27.8   2.1630   4.5 ------	UNKNOWN                       
278.2818 -12.0343    2.9  28.5  -89.7   1.1558   4.0 ------	UNKNOWN

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

    Time interval of the image:
-2.160000 15.756590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3659  35.4447    6.5  48.0   -2.8   0.1915   1.8    7.6	Her X-1                       
268.3823  -1.6521    4.3  31.3  -61.3  -0.1974  -2.7   12.0	SW J1753.5-0127               
273.8558 -14.0054    7.2  32.9  -86.6  -0.1486  -1.6    8.9	GX 17+2                       
285.2305 -24.9383    5.4  35.7 -113.5  -0.1858  -2.2   10.6	HT1900.1-2455                 
288.5967  10.9252    8.5   9.6  -28.5   0.0700   1.4   11.9	GRS 1915+105                  
299.8513  35.2060    0.0  26.7   49.7  -0.0891  -1.2   12.8	Cyg X-1                       
308.1793  40.8995    7.2  33.6   60.3  -0.1676  -1.6    4.5	Cyg X-3                       
326.2321  38.4861   10.0  39.2   82.2   0.2590   1.2   10.3	Cyg X-2                       
326.7949  -8.2502    0.7  33.2  166.0   1.1947  17.7 ------	UNKNOWN                       
297.8656   7.2424    2.3   1.3 -126.0   0.2390   5.0 ------	UNKNOWN                       
244.7339  30.2551    2.6  54.2  -12.3   0.6813   4.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
75.556610 602.746000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7195  10.8318    4.6  42.4  -42.3   1.3118   2.5    8.3	GRS 1915+105                  
299.6395  35.3343    6.0  50.5   -7.2   1.0768   1.9    8.3	Cyg X-1                       
307.9740  40.9690    4.7  52.2    3.7   1.8162   2.5    6.3	Cyg X-3                       
326.1184  38.4385    7.1  46.7   20.9   1.0293   1.6    7.4	Cyg X-2                       
  2.7347   8.9973    2.6  39.7   86.8   5.1234   4.5  564.0	UNKNOWN                       
357.5043 -53.0926    3.7  51.3  178.5   2.3513   3.2 ------	UNKNOWN                       
350.3231 -62.9743    3.1  57.3 -170.8   4.4363   3.8 ------	UNKNOWN                       
286.3449  31.5644    2.9  55.5  -20.5   3.5827   4.0 ------	UNKNOWN                       
286.2531  29.3955    2.0  54.2  -22.6   4.2652   5.8 ------	UNKNOWN                       
323.5723 -66.1676    4.5  58.0 -156.8   4.5889   2.6 ------	UNKNOWN                       
308.1939 -58.9939    3.1  52.7 -146.4   3.8260   3.7 ------	UNKNOWN                       
287.5147 -25.9357    5.4  41.3  -98.7   3.0250   2.1 ------	UNKNOWN