Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Jan 11 23:01:18 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger572308
======================================================================

  Trigger: 00572308      Segment: 000

  BAT Trigger Time: 402140204.224   [s; MET]
      Trigger Stop: 402140205.248   [s; MET]
               UTC: 2013-09-29T09:36:33.134240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 135.069036940592   Dec: -47.5650235881594  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.91
     Image Trigger?:     NO
     Rate S/N Ratio:     11.916375287813  [ if not an image trigger ]
     Image S/N Ratio:    7.91

  Analysis Position:   [ source = BAT ]
    RA: 135.069036940592   Dec: -47.5650235881594  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 135.024383867106   Dec: -47.5563355147385  [deg; J2000]  
        { 09h 00m 05.9s , -47d 33' 22.8" }
         +/- 1.64196610130637 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.723140109240809 [arcmin] (formal 1-sigma fit error)
    SNR: 14.9780493096766
 
  Angular difference between the analysis and refined position is 1.881589 arcmin
 
  Partial Coding Fraction: 0.4453125    [ including projection effects ]

  Duration
     T90: 12.2400000095367 +/- 4.05928065016228
        Measured from: -1.47999995946884
                   to: 10.7600000500679     [s; relative to TRIGTIME]
     T50: 4.04800003767014 +/- 1.11670942199236
        Measured from: 0.136000037193298
                   to: 4.18400007486343     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.32400000095367     
                   to: 2.32400000095367     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.92799997329712     
                   to: 12.4080000519753     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.388187   0.528107   0.258728  -0.022028
           0.037468   0.041196   0.039912   0.042177 [error]
 Peak      0.074948   0.062017   0.037513   0.013495
           0.010389   0.011578   0.011049   0.010855 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   14.336   -1.928   12.408
T90    12.240   -1.480   10.760
T50     4.048    0.136    4.184
Peak    1.000    1.324    2.324
 
 
====== 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      -1.965    -0.190      0.180       -           -               -         5.36e-03     -6.76e-04          6.62e-04      51.640   57
CPL     -0.968    -0.779      0.950       43.847     -11.331        17.937      1.98e-02     -1.25e-02          4.94e-02      46.630   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -2.059     -0.392     0.347       -           -               -         1.10e-02     -2.84e-03          2.70e-03      76.400   57
CPL     -1.999     -0.237     0.998        4.907      N/A           N/A         1.14e-02        N/A               N/A         76.470   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   1.52e-07  2.11e-07  2.16e-07  4.04e-07  7.08e-07  9.83e-07   erg/cm2
      90%_error_low -2.08e-08 -2.09e-08 -3.67e-08 -1.21e-07 -8.44e-08 -1.65e-07   erg/cm2
      90%_error_hi   2.13e-08  2.09e-08  3.74e-08  1.51e-07  8.62e-08  1.89e-07   erg/cm2
Peak flux       PL   7.73e-01  5.60e-01  2.69e-01  1.82e-01  1.69e+00  1.78e+00   ph/cm2/s
      90%_error_low -1.86e-01 -1.02e-01 -8.90e-02 -9.40e-02 -2.98e-01 -3.23e-01   ph/cm2/s
      90%_error_hi   1.92e-01  1.01e-01  9.29e-02  1.41e-01  2.98e-01  3.26e-01   ph/cm2/s
 
Fluence        CPL   1.38e-07  2.36e-07  2.08e-07  9.45e-08  6.47e-07  6.76e-07   erg/cm2
      90%_error_low -2.41e-08 -2.83e-08 -4.51e-08 -6.35e-08 -8.92e-08 -1.12e-07   erg/cm2
      90%_error_hi   2.42e-08  2.92e-08  4.32e-08  1.84e-07  9.54e-08  2.01e-07   erg/cm2
Peak flux      CPL   7.81e-01  5.54e-01  2.69e-01    N/A    1.66e+00  1.79e+00   ph/cm2/s
      90%_error_low -2.29e-01     N/A       N/A   -9.40e-02     N/A       N/A     ph/cm2/s
      90%_error_hi   1.86e-01     N/A       N/A    1.41e-01     N/A       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
  135.0244   -47.5563   0.0128    42.5817     1.7264         1.2461214     14.978 TRIG_00572308                 
 
Foreground time interval of the image:
 -1.928  12.408 (delta_t =  14.336 [sec])
Background time interval of the image:
-119.224  -1.928 (delta_t = 117.296 [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   -1.928 sec. to   12.408 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.9646     ( -0.190435   0.179694 )
Norm@50keV  : 5.35846E-03    ( -0.000675567   0.000661932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.64 using 59 PHA bins.
# Reduced chi-squared =         0.9059 for     57 degrees of freedom 
# Null hypothesis probability =   6.758036e-01
 
Photon flux (15-150 keV)    in 14.34 sec: 0.791020 ( -0.07782  0.077833 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.07619e-07 ( -8.43876e-08  8.62324e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.928 sec. to   12.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.968204     ( -0.778717   0.950282 )
Epeak [keV] : 43.8469      ( -11.3306 17.9375 )
Norm@50keV  : 1.97697E-02    ( -0.0124904   0.0494408 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.63 using 59 PHA bins.
# Reduced chi-squared =         0.8327 for     56 degrees of freedom 
# Null hypothesis probability =   8.095638e-01
 
Photon flux (15-150 keV)    in 14.34 sec: 0.761208 ( -0.080586  0.080798 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.46918e-07 ( -8.92066e-08  9.53819e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.324 sec. to    2.324 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.05878     ( -0.392056   0.347403 )
Norm@50keV  : 1.09533E-02    ( -0.00284461   0.00270444 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.40 using 59 PHA bins.
# Reduced chi-squared =          1.340 for     57 degrees of freedom 
# Null hypothesis probability =   4.413103e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.68915 ( -0.29768  0.29771 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01419e-07 ( -2.30508e-08  2.41724e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.324 sec. to    2.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.12806     ( -0.108793   1.12594 )
Epeak [keV] : 66.5778      (   )
Norm@50keV  : 9.85687E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.28 using 59 PHA bins.
# Reduced chi-squared =          1.362 for     56 degrees of freedom 
# Null hypothesis probability =   3.708749e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.66472 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 12.24 sec.
Hardness ratio (energy fluence ratio) = 1.02489680701

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

    S(15-50 keV)  = 3.628004e-07
S(50-150 keV) = 3.448205e-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 = 9.185392598813594E-01, IMY = -2.768482040946642E-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:
-119.224000 -1.928000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4880 -40.5509    1.9  35.6    1.3   1.2795   6.1    1.9	Vela X-1                      
108.4441 -25.5352    3.3  33.1   50.0   0.9178   3.5 ------	UNKNOWN                       
139.4625  51.8505    2.7  56.9 -175.8   3.6857   4.2 ------	UNKNOWN                       
167.7385 -51.3737    2.4  53.6  -23.2   2.2314   4.9 ------	UNKNOWN                       
176.0594 -23.8025    2.6  43.4  -58.9   2.2979   4.4 ------	UNKNOWN

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

    Time interval of the image:
-1.928000 12.408000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6875 -40.5099    5.2  35.5    1.0   0.1502   2.2    7.7	Vela X-1                      
 98.1733 -31.0731    2.1  43.6   50.0   1.1027   5.5 ------	UNKNOWN                       
135.0243 -47.5563    0.8  42.6    1.7   1.2462  15.0 ------	UNKNOWN                       
159.5894  45.0508    2.3  54.5 -157.9   0.8349   5.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
85.076600 962.851800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5137 -40.5664    0.7   7.0 -147.9   9.2105  17.3    1.0	Vela X-1                      
170.3609 -60.6703    3.2  24.0  -14.4   2.1024   3.5    3.1	Cen X-3                       
186.6389 -62.7529    0.8  32.0  -13.0   9.8017  15.2    1.2	GX 301-2                      
 88.5375 -63.4385    3.1  29.8   70.4   3.8067   3.8 ------	UNKNOWN                       
183.8679 -73.8103    2.1  33.6    7.3   3.4426   5.5 ------	UNKNOWN                       
205.1560 -37.5882    3.4  50.7  -44.5  11.0295   4.0 ------	UNKNOWN                       
204.8634 -37.4823    5.3  50.6  -44.8   8.4985   3.0 ------	UNKNOWN