Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Feb 13 10:27:23 EST 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger735188
======================================================================

  Trigger: 00735188      Segment: 000

  BAT Trigger Time: 507123060.8   [s; MET]
      Trigger Stop: 507123061.824   [s; MET]
               UTC: 2017-01-26T11:30:42.281540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 263.579092607182   Dec: -64.7575950508616  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.35
     Image Trigger?:     NO
     Rate S/N Ratio:     36.5239647354993  [ if not an image trigger ]
     Image S/N Ratio:    7.35

  Analysis Position:   [ source = BAT ]
    RA: 263.579092607182   Dec: -64.7575950508616  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 263.625723191034   Dec: -64.7521175159684  [deg; J2000]
        { 17h 34m 30.2s , -64d 45' 07.6" }
         +/- 1.5006274137695 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.52533284016185 [arcmin] (formal 1-sigma fit error)
    SNR: 17.0333466814202
 
  Angular difference between the analysis and refined position is 1.237687 arcmin
 
  Partial Coding Fraction: 0.04003906    [ including projection effects ]

  Duration
     T90: 9.53600001335144 +/- 1.58068339013808
        Measured from: -0.184000015258789
                   to: 9.35199999809265     [s; relative to TRIGTIME]
     T50: 3.90400004386902 +/- 0.891416807562371
        Measured from: 0.839999973773956
                   to: 4.74400001764297     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.307999968528748     
                   to: 1.30799996852875     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.759999990463257     
                   to: 10.8880000114441     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.998029   1.763836   1.415471   0.492345
           0.115028   0.128976   0.114861   0.089007 [error]
 Peak      0.228442   0.369190   0.272743   0.123119
           0.038393   0.047467   0.045749   0.033915 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   11.648   -0.760   10.888
T90     9.536   -0.184    9.352
T50     3.904    0.840    4.744
Peak    1.000    0.308    1.308
 
 
====== 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      -1.433    -0.135      0.135       -           -               -         2.64e-02     -2.18e-03          2.18e-03      56.710   57
CPL     -1.083    -0.428      0.568      134.327     -55.048      -134.327      3.96e-02     -1.46e-02          3.57e-02      55.310   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      -1.592     -0.251     0.241       -           -               -         5.22e-02     -8.76e-03          8.66e-03      65.640   57
CPL     -1.140     -0.665     1.131       92.946      N/A           N/A         9.11e-02        N/A               N/A         64.930   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   3.69e-07  7.06e-07  1.05e-06  3.33e-06  2.95e-06  5.45e-06   erg/cm2
      90%_error_low -5.18e-08 -6.31e-08 -1.06e-07 -6.61e-07 -2.62e-07 -7.51e-07   erg/cm2
      90%_error_hi   5.36e-08  6.26e-08  1.05e-07  7.62e-07  2.64e-07  8.29e-07   erg/cm2
Peak flux       PL   2.34e+00  2.23e+00  1.48e+00  1.53e+00  6.68e+00  7.59e+00   ph/cm2/s
      90%_error_low -5.57e-01 -3.71e-01 -3.04e-01 -5.29e-01 -1.08e+00 -1.23e+00   ph/cm2/s
      90%_error_hi   5.85e-01  3.68e-01  2.99e-01  6.48e-01  1.08e+00  1.23e+00   ph/cm2/s
 
Fluence        CPL   3.48e-07  7.35e-07  1.08e-06  2.01e-06  2.90e-06  4.18e-06   erg/cm2
      90%_error_low -5.96e-08 -7.55e-08 -1.17e-07 -1.00e-06 -2.80e-07 -1.02e-06   erg/cm2
      90%_error_hi   6.08e-08  7.81e-08  1.20e-07  1.57e-06  2.77e-07  1.61e-06   erg/cm2
Peak flux      CPL   2.22e+00  2.38e+00  1.56e+00  9.33e-01  6.69e+00  7.10e+00   ph/cm2/s
      90%_error_low -6.16e-01 -4.57e-01 -3.45e-01 -6.41e-01 -1.08e+00 -1.27e+00   ph/cm2/s
      90%_error_hi   6.36e-01  5.03e-01  3.62e-01  8.40e-01  1.08e+00  1.48e+00   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    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   -0.760 sec. to   10.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43319     ( -0.135135   0.135425 )
Norm@50keV  : 2.63951E-02    ( -0.00218212   0.00217823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.71 using 59 PHA bins.
# Reduced chi-squared =         0.9949 for     57 degrees of freedom 
# Null hypothesis probability =   4.859721e-01
 
Photon flux (15-150 keV)    in 11.65 sec: 3.23955 ( -0.27614  0.27655 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.9522e-06 ( -2.62243e-07  2.63648e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.760 sec. to   10.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.08282     ( -0.428223   0.568279 )
Epeak [keV] : 134.327      ( -55.0501 -134.329 )
Norm@50keV  : 3.95967E-02    ( -0.0145934   0.0356727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.31 using 59 PHA bins.
# Reduced chi-squared =         0.9878 for     56 degrees of freedom 
# Null hypothesis probability =   5.007573e-01
 
Photon flux (15-150 keV)    in 11.65 sec: 3.20703 ( -0.28041  0.28058 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.89691e-06 ( -2.80141e-07  2.77227e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.308 sec. to    1.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.59158     ( -0.250498   0.240938 )
Norm@50keV  : 5.21527E-02    ( -0.00876028   0.00865927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.64 using 59 PHA bins.
# Reduced chi-squared =          1.152 for     57 degrees of freedom 
# Null hypothesis probability =   2.023998e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.68473 ( -1.0822  1.08267 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.88315e-07 ( -8.65519e-08  8.69792e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.308 sec. to    1.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13972     ( -0.664531   1.13119 )
Epeak [keV] : 92.9458      (   )
Norm@50keV  : 9.10587E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.93 using 59 PHA bins.
# Reduced chi-squared =          1.159 for     56 degrees of freedom 
# Null hypothesis probability =   1.934833e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.68835 ( -1.08124  1.08201 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.81194e-07 ( -9.17366e-08  8.95745e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 9.536 sec.
Hardness ratio (energy fluence ratio) = 1.48125501061

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

    S(15-50 keV)  = 1.0748233e-06
S(50-150 keV) = 1.8774101e-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.




    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:
-239.800000 -0.760000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7050 -40.3865    0.0  32.5   45.2   0.2769   0.9   12.9	Vela X-1                      
170.3304 -60.6462    2.2   9.1  -17.1   1.0000   5.2    1.5	Cen X-3                       
186.6726 -62.7597    2.4  10.0  -66.6   0.8902   4.9    0.8	GX 301-2                      
220.9138 -19.4573    3.7  45.9 -171.5   1.1381   3.2 ------	UNKNOWN                       
 74.2084 -53.3973    3.0  57.0   -6.8   3.3160   3.8 ------	UNKNOWN

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

    Time interval of the image:
-0.760000 10.888000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5184 -40.6975    5.5  32.5   44.5  -0.1210  -2.1    8.6	Vela X-1                      
170.6559 -60.6946    9.7   9.1  -18.1   0.0453   1.2   10.9	Cen X-3                       
186.9972 -62.8258   11.7  10.1  -67.3  -0.0369  -1.0    9.9	GX 301-2                      
160.8928 -48.5131    2.1  13.2   53.7   0.2073   5.5 ------	UNKNOWN                       
248.0837 -72.3930    2.7  33.6  -80.3   0.3969   4.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
71.500600 362.260000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.3272 -60.6300 1653.9  39.0   85.7  -0.0040  -0.0    0.5	Cen X-3                       
186.5573 -62.5803    0.0  32.1   92.3   0.1066   0.4   11.7	GX 301-2                      
244.9654 -15.6394    1.0  50.7 -168.7   5.4224  12.1    0.8	Sco X-1                       
255.9901 -37.8449    0.6  27.3 -158.4   3.1115  18.5    0.2	4U 1700-377                   
256.5577 -36.4993    2.9  28.6 -157.1   0.6929   4.0    7.5	GX 349+2                      
263.0065 -24.7716    2.1  40.0 -146.1   1.5497   5.6    1.6	GX 1+4                        
264.8418 -44.4043    5.9  20.4 -142.7   0.2867   1.9    5.0	4U 1735-44                    
270.1402 -25.0661   10.4  39.9 -136.0   0.3118   1.1    7.9	GX 5-1                        
270.4195 -25.6584    5.3  39.4 -135.6   0.6116   2.2    8.1	GRS 1758-258                  
275.7323 -30.3291    4.3  35.3 -127.0  -0.6804  -2.7   10.2	H1820-303                     
285.0075 -25.0750   18.9  42.0 -115.7   0.3710   0.6    9.4	HT1900.1-2455                 
263.0636 -33.9652   21.2  30.8 -146.1   0.1025   0.5    8.7	GX 354-0                      
 63.2028 -70.5200    3.1  44.0   25.1   1.1532   3.7 ------	UNKNOWN                       
241.9854 -31.9113    2.5  35.5 -177.9   0.9219   4.6 ------	UNKNOWN                       
241.6987 -18.3590    3.0  48.7 -173.4   1.2465   3.9 ------	UNKNOWN                       
259.8905 -25.0254    0.9  39.8 -150.5   3.2935  13.2 ------	UNKNOWN