Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jun 10 20:43:55 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger537195
======================================================================

  Trigger: 00537195      Segment: 000

  BAT Trigger Time: 373416640.512   [s; MET]
      Trigger Stop: 373416641.536   [s; MET]
               UTC: 2012-10-31T22:50:30.689560    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 170.770786767707   Dec: -3.51064886408243  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.07
     Image Trigger?:     NO
     Rate S/N Ratio:     35.5246393366632  [ if not an image trigger ]
     Image S/N Ratio:    15.07

  Analysis Position:   [ source = BAT ]
    RA: 170.770786767707   Dec: -3.51064886408243  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 170.776082247814   Dec: -3.51721591786905  [deg; J2000]  
        { 11h 23m 06.3s , -03d 31' 02.0" }
         +/- 0.970286926301917 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.34703749028974 [arcmin] (formal 1-sigma fit error)
    SNR: 31.7564837492592
 
  Angular difference between the analysis and refined position is 0.505793 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 226.199999928474 +/- 19.3833181453972
        Measured from: -198.367999911308
                   to: 27.8320000171661     [s; relative to TRIGTIME]
     T50: 195.799999952316 +/- 1.58267115966089
        Measured from: -187.76399987936
                   to: 8.03600007295609     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -190.72000002861     
                   to: -189.72000002861     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -209.004000008106     
                   to: 98.3079999685287     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.580615   4.946582   3.608098   0.903695
           0.101215   0.105918   0.095253   0.085569 [error]
 Peak      0.069822   0.099456   0.112613   0.047212
           0.007746   0.008811   0.008952   0.007105 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  307.312 -209.004   98.308
T90   226.200 -198.368   27.832
T50   195.800 -187.764    8.036
Peak    1.000 -190.720 -189.720
 
 
====== 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      -1.514    -0.054      0.054       -           -               -         2.73e-03     -7.55e-05          7.55e-05      40.990   57
CPL     -1.426    -0.119      0.218      347.027    -347.027      -347.027      3.00e-03     -3.33e-04          7.77e-04      40.490   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      -1.057     -0.151     0.153       -           -               -         2.19e-02     -1.81e-03          1.81e-03      42.540   57
CPL     -1.003     -0.207     0.362      959.041    -959.041      -959.041      2.33e-02     -3.09e-03          9.07e-03      42.810   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   1.09e-06  1.98e-06  2.77e-06  8.12e-06  7.95e-06  1.40e-05   erg/cm2
      90%_error_low -5.95e-08 -6.20e-08 -9.88e-08 -6.50e-07 -2.36e-07 -7.07e-07   erg/cm2
      90%_error_hi   6.08e-08  6.18e-08  9.86e-08  6.90e-07  2.37e-07  7.39e-07   erg/cm2
Peak flux       PL   5.90e-01  7.74e-01  7.43e-01  1.27e+00  2.53e+00  3.38e+00   ph/cm2/s
      90%_error_low -9.73e-02 -7.84e-02 -7.14e-02 -2.50e-01 -2.13e-01 -3.12e-01   ph/cm2/s
      90%_error_hi   1.03e-01  7.72e-02  7.05e-02  2.88e-01  2.13e-01  3.22e-01   ph/cm2/s
 
Fluence        CPL   1.06e-06  1.99e-06  2.79e-06  7.13e-06  7.89e-06  1.30e-05   erg/cm2
      90%_error_low -7.68e-08 -6.47e-08 -1.05e-07 -1.86e-06 -2.75e-07 -1.88e-06   erg/cm2
      90%_error_hi   6.41e-08  6.78e-08  1.06e-07  1.15e-06  2.72e-07  1.22e-06   erg/cm2
Peak flux      CPL   5.97e-01  7.74e-01  7.42e-01  1.34e+00  2.54e+00  3.37e+00   ph/cm2/s
      90%_error_low     N/A   -7.87e-02 -6.98e-02 -5.19e-01 -2.22e-01 -4.80e-01   ph/cm2/s
      90%_error_hi      N/A    7.74e-02  7.56e-02  6.23e-02  2.04e-01  3.00e-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
  170.7761    -3.5172   0.0061     4.6259   -31.7937         4.9931852     31.756 TRIG_00537195                 
 
Foreground time interval of the image:
-152.211  15.389 (delta_t = 167.600 [sec])
Background time interval of the image:




    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 -209.004 sec. to   98.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51396     ( -0.054271   0.05421 )
Norm@50keV  : 2.73177E-03    ( -7.55408e-05   7.55037e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.99 using 59 PHA bins.
# Reduced chi-squared =         0.7192 for     57 degrees of freedom 
# Null hypothesis probability =   9.456494e-01
 
Photon flux (15-150 keV)    in 307.3 sec: 0.342336 ( -0.010269  0.0103 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.94681e-06 ( -2.36131e-07  2.36757e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from -209.004 sec. to   98.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.42644     ( -0.119048   0.217727 )
Epeak [keV] : 347.027      ( -347.965 -347.965 )
Norm@50keV  : 3.00412E-03    ( -0.000331884   0.000777682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.49 using 59 PHA bins.
# Reduced chi-squared =         0.7231 for     56 degrees of freedom 
# Null hypothesis probability =   9.409896e-01
 
Photon flux (15-150 keV)    in 307.3 sec: 0.340021 ( -0.011587  0.011566 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.88811e-06 ( -2.74646e-07  2.71555e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from -190.720 sec. to -189.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.05748     ( -0.150812   0.152917 )
Norm@50keV  : 2.18813E-02    ( -0.00181142   0.00181036 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.54 using 59 PHA bins.
# Reduced chi-squared =         0.7463 for     57 degrees of freedom 
# Null hypothesis probability =   9.230118e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.52866 ( -0.21275  0.2131 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32001e-07 ( -2.18459e-08  2.20144e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from -190.720 sec. to -189.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.05224     ( -0.207665   0.361341 )
Epeak [keV] : 9999.33      ( -9999.34 -9999.34 )
Norm@50keV  : 2.20044E-02    ( -0.00181827   0.0103387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.56 using 59 PHA bins.
# Reduced chi-squared =         0.7600 for     56 degrees of freedom 
# Null hypothesis probability =   9.072788e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.53747 ( -0.22221  0.20362 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32697e-07 ( -2.63776e-08  1.47203e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = 6.877185746185352E-02, IMY = 4.262995032197137E-02

    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:

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

    Time interval of the image:
-152.211400 15.388600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5379 -40.4936    4.2  52.5    3.1   1.3168   2.7    3.7	Vela X-1                      
204.5152  47.6410    2.3  55.0  176.8   3.8321   5.1 ------	UNKNOWN                       
170.7761  -3.5172    0.4   4.6  -31.8   4.9920  31.7 ------	UNKNOWN                       
155.9854 -40.7135    2.6  43.9  -14.4   1.0894   4.4 ------	UNKNOWN                       
204.0446  13.2795    2.8  35.2 -142.2   0.9182   4.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
48.588590 139.208000
140.488000 962.629900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5564 -40.4534    7.3  48.7   19.2   2.1142   1.6    6.2	Vela X-1                      
170.3344 -60.6319    4.2  57.1  -16.3   6.1096   2.8    0.8	Cen X-3                       
188.6840  42.9630    2.6  49.2 -179.2   4.9591   4.5 ------	UNKNOWN                       
194.7679  40.4368    3.1  49.2 -172.4   4.3928   3.8 ------	UNKNOWN                       
185.1682  -9.7991    2.9  15.6  -82.2   1.9960   4.0 ------	UNKNOWN                       
213.5446  40.2877    5.2  58.7 -159.2  10.1938   2.2 ------	UNKNOWN                       
211.9942  -7.7374    5.2  41.2  -98.8   7.6803   2.2 ------	UNKNOWN