Analysis Summary

Notes:

Special note: Due to the low partial coding fraction, the refined position is found using the DETECTION mask. Therefore, the refined position and the mask shadow pattern shown here are from analyses with DETECTION mask, everything else uses the FLUX mask.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat May  9 18:19:56 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger595616
======================================================================

  Trigger: 00595616      Segment: 000

  BAT Trigger Time: 419040592   [s; MET]
      Trigger Stop: 419040656   [s; MET]
               UTC: 2014-04-13T00:09:40.120580    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 65.4492072468499   Dec: -51.2050253508241  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.49
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    12.49

  Analysis Position:   [ source = BAT ]
    RA: 65.4492072468499   Dec: -51.2050253508241  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA:    Dec:   [deg; J2000]  
        { 00h 00m 00.0s , +00d 00' 00.0" }
         +/- -inf [arcmin] (estimated 90% radius based on SNR)
         +/- 0 [arcmin] (formal 1-sigma fit error)
    SNR: 
 
  Angular difference between the analysis and refined position is 4494.637978 arcmin
 
  Partial Coding Fraction: 0.06103516    [ including projection effects ]

  Duration
     T90: 132.976000010967 +/- 14.3671135780925
        Measured from: -29.1919999718666
                   to: 103.784000039101     [s; relative to TRIGTIME]
     T50: 61.1200000047684 +/- 6.69989371629822
        Measured from: 19.7360000014305
                   to: 80.8560000061989     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 77.9480000138283     
                   to: 78.9480000138283     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -49.688000023365     
                   to: 114.39200001955     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.262959   6.465389   5.007518   1.677108
           0.287261   0.305895   0.276780   0.243914 [error]
 Peak      0.089898   0.121625   0.144845   0.031350
           0.023169   0.026923   0.026634   0.019408 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  164.080  -49.688  114.392
T90   132.976  -29.192  103.784
T50    61.120   19.736   80.856
Peak    1.000   77.948   78.948
 
 
====== 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      -1.470    -0.096      0.096       -           -               -         7.26e-03     -3.90e-04          3.90e-04      69.050   57
CPL     -1.261    -0.257      0.394      186.047     -89.221      -186.047      9.16e-03     -2.19e-03          4.88e-03      68.100   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      -1.726     -0.377     0.330       -           -               -         2.15e-02     -5.26e-03          5.08e-03      53.350   57
CPL     -0.704     -1.533     1.878       67.616     -38.566       -67.616      6.88e-02     -6.88e-02          4.85e-01      51.800   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   1.48e-06  2.77e-06  3.99e-06  1.22e-05  1.14e-05  2.05e-05   erg/cm2
      90%_error_low -1.44e-07 -1.63e-07 -2.71e-07 -1.74e-06 -6.60e-07 -1.94e-06   erg/cm2
      90%_error_hi   1.48e-07  1.62e-07  2.70e-07  1.93e-06  6.63e-07  2.09e-06   erg/cm2
Peak flux       PL   1.10e+00  9.67e-01  5.85e-01  5.34e-01  2.88e+00  3.18e+00   ph/cm2/s
      90%_error_low -3.35e-01 -2.13e-01 -1.79e-01 -2.60e-01 -6.31e-01 -7.02e-01   ph/cm2/s
      90%_error_hi   3.61e-01  2.12e-01  1.74e-01  3.41e-01  6.31e-01  7.06e-01   ph/cm2/s
 
Fluence        CPL   1.42e-06  2.82e-06  4.06e-06  9.06e-06  1.12e-05  1.74e-05   erg/cm2
      90%_error_low -1.76e-07 -1.85e-07 -2.97e-07 -3.58e-06 -7.19e-07 -3.61e-06   erg/cm2
      90%_error_hi   1.80e-07  1.89e-07  3.02e-07  3.71e-06  7.14e-07  3.88e-06   erg/cm2
Peak flux      CPL   9.11e-01  1.08e+00  6.78e-01  2.53e-01  2.84e+00  2.92e+00   ph/cm2/s
      90%_error_low -4.14e-01 -2.61e-01 -2.24e-01 -2.53e-01 -6.37e-01 -6.79e-01   ph/cm2/s
      90%_error_hi   4.38e-01  2.77e-01  2.41e-01  4.31e-01  6.34e-01  7.38e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data; DETECTION mask)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   65.4392   -51.1868   0.0132    40.7900   -81.0817        16.7521506     14.540 TRIG_00595616                 
 
Foreground time interval of the image:
-57.560 281.701 (delta_t = 339.261 [sec])
Background time interval of the image:
-239.000 -57.560 (delta_t = 181.440 [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  -49.688 sec. to  114.392 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47035     ( -0.0961198   0.0959201 )
Norm@50keV  : 7.25621E-03    ( -0.000390158   0.000389598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.05 using 59 PHA bins.
# Reduced chi-squared =          1.211 for     57 degrees of freedom 
# Null hypothesis probability =   1.316289e-01
 
Photon flux (15-150 keV)    in 164.1 sec: 0.898851 ( -0.050508  0.05062 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13543e-05 ( -6.59561e-07  6.62534e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -49.688 sec. to  114.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2612     ( -0.257336   0.394138 )
Epeak [keV] : 186.047      ( -89.221 -186.047 )
Norm@50keV  : 9.15712E-03    ( -0.00218546   0.00488484 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.10 using 59 PHA bins.
# Reduced chi-squared =          1.216 for     56 degrees of freedom 
# Null hypothesis probability =   1.288011e-01
 
Photon flux (15-150 keV)    in 164.1 sec: 0.888952 ( -0.053299  0.053343 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12003e-05 ( -7.18886e-07  7.14308e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   77.948 sec. to   78.948 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.7262     ( -0.376896   0.329787 )
Norm@50keV  : 2.14661E-02    ( -0.00526091   0.0050797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.35 using 59 PHA bins.
# Reduced chi-squared =         0.9360 for     57 degrees of freedom 
# Null hypothesis probability =   6.127287e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.87766 ( -0.63058  0.63089 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.98399e-07 ( -4.92913e-08  4.97486e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   77.948 sec. to   78.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.703521     ( -1.53319   1.87798 )
Epeak [keV] : 67.6162      ( -38.5649 -67.6153 )
Norm@50keV  : 6.87718E-02    ( -0.0687857   0.485301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.80 using 59 PHA bins.
# Reduced chi-squared =         0.9250 for     56 degrees of freedom 
# Null hypothesis probability =   6.344558e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.84492 ( -0.63652  0.63431 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.98861e-07 ( -5.02469e-08  5.07823e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 132.976 sec.
Hardness ratio (energy fluence ratio) = 1.44361016655

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

    S(15-50 keV)  = 4.245794e-06
S(50-150 keV) = 7.108537e-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 (with DETECTION mask) 

    IMX = 1.337672409638843E-01, IMY = 8.524394179970561E-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:
-239.000000 -49.688000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5052 -40.5438    1.2  25.8   11.5   1.8019   9.4    1.2	Vela X-1                      
170.2840 -60.6621    2.3  12.4  105.8   0.8822   5.1    2.5	Cen X-3                       
186.5924 -62.7536    2.0  18.0  128.1   1.1241   5.9    2.0	GX 301-2                      
337.8324 -67.7433    3.0  46.2 -145.0   1.6882   3.8 ------	UNKNOWN

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

    Time interval of the image:
-49.688000 114.392000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3318 -40.4487    9.1  25.9   11.2  -0.2495  -1.3   11.0	Vela X-1                      
170.6783 -60.5751    6.7  12.6  106.0   0.3266   1.7   11.1	Cen X-3                       
186.6254 -62.8696    2.2  17.9  128.5   0.9950   5.1    6.0	GX 301-2                      
102.3880 -32.5870    2.8  41.8  -30.6   1.2916   4.1 ------	UNKNOWN                       
 65.4550 -51.1784    0.5  40.8  -81.1  18.6431  21.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
386.900600 839.044100
841.000000 848.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.6410 -62.7591    2.9  50.1    8.4   4.5756   4.0    0.8	GX 301-2                      
244.9750 -15.6390    0.1  14.3  151.2  35.1117  84.5    0.3	Sco X-1                       
255.9859 -37.8535    2.7  11.2  -64.6   1.8160   4.3    0.6	4U 1700-377                   
256.3268 -36.2805    6.3  10.4  -72.1   0.7817   1.8   10.0	GX 349+2                      
263.0233 -24.6723    3.7  15.5 -128.3   1.3613   3.1    4.5	GX 1+4                        
264.7240 -44.5249   10.4  20.5  -62.1   0.5306   1.1    4.6	4U 1735-44                    
268.4504  -1.5959 2518.2  35.1 -162.3   0.0020   0.0    9.9	SW J1753.5-0127               
270.1540 -25.0292    2.0  21.5 -120.0   2.7074   5.8    7.7	GX 5-1                        
270.3157 -25.7501    2.7  21.4 -118.0   2.0405   4.4    0.8	GRS 1758-258                  
274.0598 -14.0762    3.4  29.9 -138.6   1.7683   3.4    3.9	GX 17+2                       
275.8679 -30.3147    5.4  25.3 -104.2   1.0794   2.1    4.3	H1820-303                     
285.0337 -24.9219   12.8  34.4 -111.5   0.7545   0.9    0.2	HT1900.1-2455                 
288.8175  10.9702    3.6  57.6 -151.3   8.9408   3.2    1.9	GRS 1915+105                  
262.8561 -33.6572    0.0  14.4  -93.2   0.7166   1.6   12.5	GX 354-0                      
231.8657 -35.7625    3.4  13.6   38.0   1.4918   3.4 ------	UNKNOWN                       
252.7172 -25.3095    2.6   7.1 -151.1   1.8055   4.4 ------	UNKNOWN                       
265.6713 -27.7749    1.7  16.9 -115.1   3.0341   6.7 ------	UNKNOWN                       
266.1171 -28.7252    0.6  17.1 -111.7   8.3432  18.6 ------	UNKNOWN