Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Aug 30 17:57:53 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger767563
======================================================================

  Trigger: 00767563      Segment: 000

  BAT Trigger Time: 524279616   [s; MET]
      Trigger Stop: 524279680   [s; MET]
               UTC: 2017-08-13T01:13:16.481520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 201.05359481432   Dec: -5.46898251598156  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.29
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    12.29

  Analysis Position:   [ source = BAT ]
    RA: 201.05359481432   Dec: -5.46898251598156  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 201.057211676584   Dec: -5.52775943640573  [deg; J2000]  
        { 13h 24m 13.7s , -05d 31' 39.9" }
         +/- 3.36598042834404 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.87689523116516 [arcmin] (formal 1-sigma fit error)
    SNR: 5.37157727654821
 
  Angular difference between the analysis and refined position is 3.533225 arcmin
 
  Partial Coding Fraction: 0.7109375    [ including projection effects ]

  Duration
     T90: 72.5439999103546 +/- 12.1017426966481
        Measured from: -7.42799997329712
                   to: 65.1159999370575     [s; relative to TRIGTIME]
     T50: 26.851999938488 +/- 7.16806808818949
        Measured from: 0.431999981403351
                   to: 27.2839999198914     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.78799998760223     
                   to: 3.78799998760223     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -9.16399997472763     
                   to: 77.0879999995232     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.573750   0.870691   0.850595   0.347314
           0.066406   0.068366   0.060529   0.052914 [error]
 Peak      0.016220   0.034327   0.034838   0.022817
           0.007377   0.007800   0.007164   0.006304 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   86.252   -9.164   77.088
T90    72.544   -7.428   65.116
T50    26.852    0.432   27.284
Peak    1.000    2.788    3.788
 
 
====== 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      -1.097    -0.137      0.141       -           -               -         2.10e-03     -1.61e-04          1.61e-04      57.760   57
CPL     -1.097    -0.134      0.148     9999.310    -9999.310      -9999.310      2.10e-03     -1.48e-04          1.42e-03      57.780   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      -1.103     -0.403     0.432       -           -               -         6.89e-03     -1.56e-03          1.56e-03      48.770   57
CPL     -1.101     -0.402     0.438     9999.360    -9999.360      -9999.360      6.92e-03     -1.56e-03          4.46e-02      48.780   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   1.59e-07  3.74e-07  6.99e-07  3.16e-06  1.90e-06  4.39e-06   erg/cm2
      90%_error_low -2.50e-08 -3.57e-08 -5.92e-08 -5.84e-07 -1.53e-07 -6.16e-07   erg/cm2
      90%_error_hi   2.64e-08  3.52e-08  5.88e-08  6.78e-07  1.54e-07  6.97e-07   erg/cm2
Peak flux       PL   1.94e-01  2.48e-01  2.30e-01  3.77e-01  7.99e-01  1.05e+00   ph/cm2/s
      90%_error_low -8.33e-02 -7.08e-02 -5.89e-02 -1.73e-01 -1.86e-01 -2.48e-01   ph/cm2/s
      90%_error_hi   9.66e-02  6.80e-02  5.76e-02  2.56e-01  1.87e-01  2.64e-01   ph/cm2/s
 
Fluence        CPL   1.59e-07  3.74e-07  6.99e-07  3.15e-06  1.90e-06  4.37e-06   erg/cm2
      90%_error_low -2.52e-08 -3.25e-08 -5.84e-08 -1.54e-06 -1.61e-07 -1.51e-06   erg/cm2
      90%_error_hi   2.63e-08  3.77e-08  6.97e-08  6.59e-07  1.53e-07  3.63e-07   erg/cm2
Peak flux      CPL   1.95e-01  2.48e-01  2.30e-01  3.81e-01  8.00e-01  1.05e+00   ph/cm2/s
      90%_error_low -1.00e-01 -6.44e-02 -5.88e-02 -3.81e-01 -1.91e-01 -3.92e-01   ph/cm2/s
      90%_error_hi   7.53e-02  7.70e-02  6.89e-02  2.47e-01  1.86e-01  2.41e-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
  201.0572    -5.5278   0.0358    30.2204   -34.6047         2.9155052      5.372 TRIG_00767563                 
 
Foreground time interval of the image:
 -9.164  72.901 (delta_t =  82.065 [sec])
Background time interval of the image:
-13.699  -9.164 (delta_t =   4.535 [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   -9.164 sec. to   77.088 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09685     ( -0.13747   0.140896 )
Norm@50keV  : 2.10070E-03    ( -0.000161205   0.000160688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.76 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     57 degrees of freedom 
# Null hypothesis probability =   4.470168e-01
 
Photon flux (15-150 keV)    in 86.25 sec: 0.243593 ( -0.019501  0.019592 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.89644e-06 ( -1.5287e-07  1.53633e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -9.164 sec. to   77.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09688     ( -0.137715   0.143751 )
Epeak [keV] : 9999.31      ( -9999.36 -9999.36 )
Norm@50keV  : 2.10073E-03    ( -0.000159623   0.00140929 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.78 using 59 PHA bins.
# Reduced chi-squared =          1.032 for     56 degrees of freedom 
# Null hypothesis probability =   4.093181e-01
 
Photon flux (15-150 keV)    in 86.25 sec: 0.243586 ( -0.019474  0.019424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.8964e-06 ( -1.60518e-07  1.52591e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.788 sec. to    3.788 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10304     ( -0.402716   0.431817 )
Norm@50keV  : 6.88971E-03    ( -0.00155979   0.00155524 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.77 using 59 PHA bins.
# Reduced chi-squared =         0.8557 for     57 degrees of freedom 
# Null hypothesis probability =   7.726664e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.799397 ( -0.1861  0.187447 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.19714e-08 ( -1.76876e-08  1.79514e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.788 sec. to    3.788 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10122     ( -0.403234   0.436953 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 6.92462E-03    ( -0.00155517   0.0445772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.78 using 59 PHA bins.
# Reduced chi-squared =         0.8710 for     56 degrees of freedom 
# Null hypothesis probability =   7.423804e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.800033 ( -0.190593  0.185921 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.21141e-08 ( -1.99358e-08  1.56345e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 72.544 sec.
Hardness ratio (energy fluence ratio) = 1.87016542593

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

    S(15-50 keV)  = 5.326768e-07
S(50-150 keV) = 1.3637799e-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 = 4.794411180400238E-01, IMY = 3.308027243575003E-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:
-13.699400 -9.164000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.3957 -60.4365    6.8  35.8 -166.1   0.0515   1.7   11.4	Cen X-3                       
186.3768 -62.8628    6.2  31.5 -178.2  -0.0486  -1.9    9.5	GX 301-2                      
245.0258 -15.7103    2.2  37.2   50.2   0.2491   5.3    5.0	Sco X-1                       
255.8270 -37.9894    0.0  37.2   90.8   0.1237   1.8   11.5	4U 1700-377                   
256.4503 -36.4163  135.8  38.0   88.5   0.0064   0.1    0.8	GX 349+2                      
241.9964   4.9323    2.2  50.2   26.3   0.4497   5.1 ------	UNKNOWN                       
225.3251  14.7067    2.9  51.8    1.8   0.2451   3.9 ------	UNKNOWN

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

    Time interval of the image:
-9.164000 72.900590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.3381 -60.6068   88.0  35.9 -166.3  -0.0724  -0.1    1.2	Cen X-3                       
186.3656 -62.8590    5.3  31.5 -178.2   1.0283   2.2    9.6	GX 301-2                      
245.0858 -15.7677    4.0  37.2   50.4  -2.4583  -2.9    9.8	Sco X-1                       
255.8270 -37.9894    0.0  37.2   90.8  -2.2140  -1.7   11.5	4U 1700-377                   
256.5915 -36.2810    0.0  38.1   88.3  -1.3225  -0.9   11.4	GX 349+2                      
201.0572  -5.5278    2.1  30.2  -34.6   2.9160   5.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
123.100600 963.067600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
178.2392 -59.5333    2.9  56.8  173.7  10.1587   4.1 ------	UNKNOWN                       
206.7792   8.8063    2.6  15.4    1.9   1.5291   4.4 ------	UNKNOWN                       
164.9981 -56.1727    2.5  58.2 -177.2  13.5841   4.5 ------	UNKNOWN                       
159.5206  -0.6190    3.2  41.8 -104.7   5.8514   3.6 ------	UNKNOWN