Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Oct  4 23:46:18 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger595608
======================================================================

  Trigger: 00595608      Segment: 000

  BAT Trigger Time: 419034061.632   [s; MET]
      Trigger Stop: 419034062.656   [s; MET]
               UTC: 2014-04-12T22:20:49.752900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 145.049609678632   Dec: -65.8089066452474  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10
     Image Trigger?:     NO
     Rate S/N Ratio:     12.2882057274445  [ if not an image trigger ]
     Image S/N Ratio:    10

  Analysis Position:   [ source = BAT ]
    RA: 145.049609678632   Dec: -65.8089066452474  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 144.998010188121   Dec: -65.8269537681377  [deg; J2000]  
        { 09h 39m 59.5s , -65d 49' 37.0" }
         +/- 1.65442038844535 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.604464729267588 [arcmin] (formal 1-sigma fit error)
    SNR: 14.8172337473661
 
  Angular difference between the analysis and refined position is 1.667606 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 48 +/- 22.6274169979695
        Measured from: -31.6320000290871
                   to: 16.3679999709129     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: -15.6320000290871
                   to: 0.367999970912933     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 7.86799997091293     
                   to: 8.86799997091293     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -31.6320000290871     
                   to: 16.3679999709129     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.530040   0.547798   0.213849   0.109351
           0.042879   0.043354   0.037550   0.033056 [error]
 Peak      0.031284   0.031046   0.008428   0.000666
           0.006606   0.006483   0.005519   0.004837 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   48.000  -31.632   16.368
T90    48.000  -31.632   16.368
T50    16.000  -15.632    0.368
Peak    1.000    7.868    8.868
 
 
====== 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      -2.029    -0.193      0.184       -           -               -         1.60e-03     -1.98e-04          1.94e-04      36.250   57
CPL     -2.266    -0.145      0.747      106.251      N/A           N/A         1.20e-03        N/A               N/A         35.720   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      -2.128     -0.510     0.437       -           -               -         3.86e-03     -1.35e-03          1.30e-03      47.970   57
CPL     -0.506     -1.862     4.298       33.568     -33.568       -33.568      3.99e-02     -3.99e-02          2.23e+01      46.660   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   1.61e-07  2.15e-07  2.11e-07  3.71e-07  7.09e-07  9.59e-07   erg/cm2
      90%_error_low -2.13e-08 -2.01e-08 -3.58e-08 -1.12e-07 -8.03e-08 -1.54e-07   erg/cm2
      90%_error_hi   2.18e-08  2.00e-08  3.67e-08  1.42e-07  8.22e-08  1.78e-07   erg/cm2
Peak flux       PL   2.91e-01  2.03e-01  9.28e-02  5.92e-02  6.16e-01  6.46e-01   ph/cm2/s
      90%_error_low -8.94e-02 -5.14e-02 -3.98e-02 -3.69e-02 -1.49e-01 -1.60e-01   ph/cm2/s
      90%_error_hi   9.28e-02  5.07e-02  4.33e-02  6.27e-02  1.49e-01  1.62e-01   ph/cm2/s
 
Fluence        CPL   1.59e-07  1.90e-07  2.06e-07  4.16e-07  7.17e-07  9.64e-07   erg/cm2
      90%_error_low    N/A    -5.40e-08    N/A    -1.93e-07 -8.53e-08 -2.90e-07   erg/cm2
      90%_error_hi     N/A     3.54e-08    N/A     1.58e-07  8.02e-08  1.66e-07   erg/cm2
Peak flux      CPL   2.68e-01  2.42e-01  7.53e-02  6.21e-03  5.91e-01  5.92e-01   ph/cm2/s
      90%_error_low     N/A   -7.53e-02 -5.20e-02 -6.21e-03 -1.50e-01     N/A     ph/cm2/s
      90%_error_hi      N/A    8.14e-02  5.55e-02  9.45e-02  1.52e-01     N/A     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
  144.9980   -65.8270   0.0129    16.2015    86.8548         1.3689639     14.817 TRIG_00595608                 
 
Foreground time interval of the image:
-31.632  16.368 (delta_t =  48.000 [sec])
Background time interval of the image:
-239.632 -31.632 (delta_t = 208.000 [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  -31.632 sec. to   16.368 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.02873     ( -0.192586   0.183636 )
Norm@50keV  : 1.59922E-03    ( -0.000198339   0.000193558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.25 using 59 PHA bins.
# Reduced chi-squared =         0.6359 for     57 degrees of freedom 
# Null hypothesis probability =   9.854623e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.243126 ( -0.022401  0.022408 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.09219e-07 ( -8.02618e-08  8.22451e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -31.632 sec. to   16.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.26554     ( -0.14511   0.746808 )
Epeak [keV] : 106.251      (   )
Norm@50keV  : 1.19644E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.72 using 59 PHA bins.
# Reduced chi-squared =         0.6379 for     56 degrees of freedom 
# Null hypothesis probability =   9.841419e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.223095 ( -0.048225  0.040441 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.1687e-07 ( -8.52715e-08  8.01902e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    7.868 sec. to    8.868 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.12821     ( -0.509962   0.436474 )
Norm@50keV  : 3.85864E-03    ( -0.00134956   0.00130482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.97 using 59 PHA bins.
# Reduced chi-squared =         0.8416 for     57 degrees of freedom 
# Null hypothesis probability =   7.972031e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.615709 ( -0.149391  0.149455 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.59625e-08 ( -1.07736e-08  1.15262e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    7.868 sec. to    8.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.505683     ( -1.89951   4.26062 )
Epeak [keV] : 33.5678      ( -33.6119 -33.6119 )
Norm@50keV  : 3.99296E-02    ( -0.0441445   22.252 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.66 using 59 PHA bins.
# Reduced chi-squared =         0.8331 for     56 degrees of freedom 
# Null hypothesis probability =   8.088147e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.591056 ( -0.150019  0.152347 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 48.0 sec.
Hardness ratio (energy fluence ratio) = 0.980324615507

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

    S(15-50 keV)  = 3.766891e-07
S(50-150 keV) = 3.325327e-07

    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 = 1.594155435631204E-02, IMY = -2.901177717198384E-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:
-239.632000 -31.632000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5219 -40.5362    1.3  34.0   38.7   2.5973   8.8    1.1	Vela X-1                      
170.1627 -60.5802    3.5  28.1   96.0   0.9224   3.3    5.2	Cen X-3                       
186.5854 -62.7191    2.6  31.7  110.5   1.5031   4.4    3.6	GX 301-2                      
105.5157 -34.9459    2.4  35.0   -4.8   1.1201   4.8 ------	UNKNOWN

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

    Time interval of the image:
-31.632000 16.368000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4719 -40.5221    9.5  34.0   38.6   0.1557   1.2    3.2	Vela X-1                      
170.6468 -60.5964    6.6  28.3   96.4   0.2216   1.7    9.9	Cen X-3                       
186.4859 -62.5774    0.0  31.8  110.3   0.2103   1.6   12.5	GX 301-2                      
123.1404 -23.7744    2.9  47.8   16.7   0.8250   4.0 ------	UNKNOWN                       
144.9974 -65.8257    0.8  16.2   86.9   1.3748  14.9 ------	UNKNOWN                       
104.2638 -13.6826    2.2  56.3   -7.0   1.6499   5.2 ------	UNKNOWN                       
 78.9190 -27.9706    2.2  44.1  -39.6   0.8276   5.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
55.268590 962.438000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5287 -40.5436    0.6  25.8   11.6  11.4972  20.2    0.7	Vela X-1                      
170.3329 -60.6772    2.0  12.4  105.7   3.1724   5.8    3.3	Cen X-3                       
186.6532 -62.7756    0.8  18.0  128.0   8.8767  14.1    0.3	GX 301-2                      
168.5307 -44.0429    2.3  25.3   70.5   3.7134   5.0 ------	UNKNOWN                       
120.3506 -73.2452    2.3  11.2 -113.6   2.7219   4.9 ------	UNKNOWN