Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 20:16:58 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger335895
======================================================================

  Trigger: 00335895      Segment: 000

  BAT Trigger Time: 249585528   [s; MET]
      Trigger Stop: 249585616   [s; MET]
               UTC: 2008-11-28T17:18:44.708060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 20.7981962498564   Dec: 38.1151246414524  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.22
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    20.22

  Analysis Position:   [ source = BAT ]
    RA: 20.7981962498564   Dec: 38.1151246414524  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 20.8010912395511   Dec: 38.1225509909459  [deg; J2000]  
        { 01h 23m 12.3s , +38d 07' 21.2" }
         +/- 0.957842186923752 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.313384247613815 [arcmin] (formal 1-sigma fit error)
    SNR: 32.3475425452977
 
  Angular difference between the analysis and refined position is 0.466065 arcmin
 
  Partial Coding Fraction: 0.7421875    [ including projection effects ]

  Duration
     T90: 102.315999984741 +/- 10.6085107395872
        Measured from: -48.8039999902248
                   to: 53.5119999945164     [s; relative to TRIGTIME]
     T50: 32.0120000243187 +/- 5.52789290421497
        Measured from: 3.9839999973774
                   to: 35.9960000216961     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 17.5959999859333     
                   to: 18.5959999859333     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -68.9799999892712     
                   to: 62.6599999964237     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.462672   1.830976   1.020446   0.176184
           0.066113   0.069333   0.060676   0.053871 [error]
 Peak      0.041708   0.053543   0.045269   0.016238
           0.006528   0.007044   0.006156   0.005041 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  131.640  -68.980   62.660
T90   102.316  -48.804   53.512
T50    32.012    3.984   35.996
Peak    1.000   17.596   18.596
 
 
====== 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: CPL)
 
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      -1.879    -0.087      0.086       -           -               -         2.11e-03     -1.13e-04          1.13e-04      69.730   57
CPL     -0.940    -0.401      0.444       49.855      -5.355         8.065      6.91e-03     -2.71e-03          5.16e-03      51.620   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      -1.523     -0.230     0.227       -           -               -         1.02e-02     -1.37e-03          1.36e-03      58.200   57
CPL     -1.461     -1.256     0.958      398.739    -398.739      -398.739      1.09e-02     -8.99e-03          2.22e-02      58.200   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   5.06e-07  7.39e-07  8.04e-07  1.64e-06  2.55e-06  3.69e-06   erg/cm2
      90%_error_low -3.73e-08 -3.53e-08 -5.82e-08 -2.30e-07 -1.36e-07 -2.89e-07   erg/cm2
      90%_error_hi   3.79e-08  3.53e-08  5.86e-08  2.54e-07  1.37e-07  3.07e-07   erg/cm2
Peak flux       PL   4.28e-01  4.25e-01  2.96e-01  3.26e-01  1.28e+00  1.47e+00   ph/cm2/s
      90%_error_low -9.25e-02 -5.89e-02 -5.05e-02 -1.01e-01 -1.69e-01 -1.94e-01   ph/cm2/s
      90%_error_hi   9.79e-02  5.83e-02  4.98e-02  1.25e-01  1.69e-01  1.95e-01   ph/cm2/s
 
Fluence        CPL   4.51e-07  8.13e-07  7.90e-07  4.33e-07  2.34e-06  2.49e-06   erg/cm2
      90%_error_low -4.37e-08 -4.68e-08 -6.92e-08 -1.70e-07 -1.55e-07 -2.31e-07   erg/cm2
      90%_error_hi   4.42e-08  4.76e-08  6.75e-08  2.83e-07  1.59e-07  3.18e-07   erg/cm2
Peak flux      CPL   4.24e-01  4.28e-01  2.97e-01  3.03e-01  1.28e+00  1.45e+00   ph/cm2/s
      90%_error_low -1.10e-01 -6.11e-02 -5.18e-02 -3.03e-01 -1.74e-01 -2.80e-01   ph/cm2/s
      90%_error_hi   8.59e-02  7.14e-02  5.58e-02  9.41e-02  1.71e-01  2.15e-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
   20.8011    38.1226   0.0060    31.9507  -179.9777         3.7020476     32.348 TRIG_00335895                 
 
Foreground time interval of the image:
 -4.699  62.660 (delta_t =  67.359 [sec])
Background time interval of the 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  -68.980 sec. to   62.660 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87892     ( -0.0871586   0.0858404 )
Norm@50keV  : 2.10925E-03    ( -0.000113307   0.000112545 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.73 using 59 PHA bins.
# Reduced chi-squared =          1.223 for     57 degrees of freedom 
# Null hypothesis probability =   1.200132e-01
 
Photon flux (15-150 keV)    in 131.6 sec: 0.300046 ( -0.014657  0.014674 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.55215e-06 ( -1.36151e-07  1.37134e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -68.980 sec. to   62.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.939724     ( -0.401042   0.443978 )
Epeak [keV] : 49.8555      ( -5.35507 8.06494 )
Norm@50keV  : 6.91117E-03    ( -0.00271487   0.00516203 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.62 using 59 PHA bins.
# Reduced chi-squared =         0.9218 for     56 degrees of freedom 
# Null hypothesis probability =   6.411172e-01
 
Photon flux (15-150 keV)    in 131.6 sec: 0.286294 ( -0.015625  0.015647 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.33623e-06 ( -1.55479e-07  1.58744e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   17.596 sec. to   18.596 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52253     ( -0.230223   0.22706 )
Norm@50keV  : 1.01785E-02    ( -0.00137304   0.00135987 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.20 using 59 PHA bins.
# Reduced chi-squared =          1.021 for     57 degrees of freedom 
# Null hypothesis probability =   4.308826e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.27856 ( -0.16875  0.16906 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.62255e-08 ( -1.40902e-08  1.42459e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   17.596 sec. to   18.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.46115     ( -1.25295   0.961605 )
Epeak [keV] : 398.739      ( -470.555 -470.555 )
Norm@50keV  : 1.09435E-02    ( -0.00891693   0.0222807 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.20 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     56 degrees of freedom 
# Null hypothesis probability =   3.944201e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.27589 ( -0.1738  0.17078 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.58363e-08 ( -1.54559e-08  1.45106e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 102.316 sec.
Hardness ratio (energy fluence ratio) = 0.971001852742

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

    S(15-50 keV)  = 1.2644234e-06
S(50-150 keV) = 1.0718009e-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 = -6.236743208708314E-01, IMY = 2.432135093438287E-04

    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:

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

    Time interval of the image:
-4.699400 62.660000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6358  22.0018    0.4  23.7   -2.7   2.7939  29.3    0.8	Crab                          
359.4898  30.4090    2.6  50.6  173.2   1.1856   4.4 ------	UNKNOWN                       
 94.4180   9.8346    2.5  39.2    4.9   0.6306   4.6 ------	UNKNOWN                       
 20.8011  38.1226    0.4  32.0 -180.0   3.7022  32.3 ------	UNKNOWN                       
 41.9482  61.6059    2.3  31.6 -127.6   0.5893   4.9 ------	UNKNOWN                       
 86.6948  70.2221    3.1  41.0  -98.2   1.6340   3.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
184.500600 958.400610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 68.7617  43.7887    2.6  36.2   54.8   3.6799   4.4 ------	UNKNOWN                       
 18.2083 -14.0697    2.0  52.3  172.5   8.1536   5.7 ------	UNKNOWN                       
 29.5799  30.1600    2.6  10.8  124.5   1.5897   4.5 ------	UNKNOWN                       
313.0949  57.7400    3.4  47.0  -53.1   8.8916   3.4 ------	UNKNOWN                       
330.3390  32.7161    3.4  40.9  -92.4   8.6043   3.4 ------	UNKNOWN                       
337.7811  12.8726    3.1  45.7 -122.4   8.8050   3.8 ------	UNKNOWN