Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 18:59:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger506519
======================================================================

  Trigger: 00506519      Segment: 000

  BAT Trigger Time: 341574288   [s; MET]
      Trigger Stop: 341574384   [s; MET]
               UTC: 2011-10-29T09:44:40.483020    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 44.6907552668095   Dec: 57.0853287279398  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.71
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.71

  Analysis Position:   [ source = BAT ]
    RA: 44.6907552668095   Dec: 57.0853287279398  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 44.7844698486402   Dec: 57.1039396595877  [deg; J2000]  
        { 02h 59m 08.3s , +57d 06' 14.2" }
         +/- 1.16762966405178 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.515892899549838 [arcmin] (formal 1-sigma fit error)
    SNR: 24.3763237214593
 
  Angular difference between the analysis and refined position is 3.252348 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 7.19599997997284 +/- 0.790647807535495
        Measured from: 21.1959999799728
                   to: 28.3919999599457     [s; relative to TRIGTIME]
     T50: 3.69599992036819 +/- 0.488147515975038
        Measured from: 22.716000020504
                   to: 26.4119999408722     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 23.6159999966621     
                   to: 24.6159999966621     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 20.7239999771118     
                   to: 29.1959999799728     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.317656   0.359050   0.141393   0.023708
           0.019244   0.019721   0.016446   0.013780 [error]
 Peak      0.076483   0.068401   0.026762   0.000643
           0.006920   0.007215   0.005972   0.004855 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    8.472   20.724   29.196
T90     7.196   21.196   28.392
T50     3.696   22.716   26.412
Peak    1.000   23.616   24.616
 
 
====== 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      -2.111    -0.133      0.128       -           -               -         5.36e-03     -4.88e-04          4.82e-04      65.520   57
CPL     -0.768    -0.658      0.776       36.126      -6.056         5.319      3.37e-02        N/A               N/A         51.390   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      -2.216     -0.230     0.212       -           -               -         8.81e-03     -1.49e-03          1.47e-03      59.960   57
CPL     -1.005     -0.961     1.256       30.442      N/A           N/A         5.02e-02        N/A               N/A         55.050   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   1.03e-07  1.31e-07  1.21e-07  1.97e-07  4.22e-07  5.53e-07   erg/cm2
      90%_error_low -9.84e-09 -9.26e-09 -1.49e-08 -4.34e-08 -3.46e-08 -6.21e-08   erg/cm2
      90%_error_hi   1.00e-08  9.25e-09  1.52e-08  5.09e-08  3.51e-08  6.76e-08   erg/cm2
Peak flux       PL   7.25e-01  4.79e-01  2.06e-01  1.22e-01  1.47e+00  1.53e+00   ph/cm2/s
      90%_error_low -1.06e-01 -5.83e-02 -4.45e-02 -4.24e-02 -1.70e-01 -1.80e-01   ph/cm2/s
      90%_error_hi   1.08e-01  5.78e-02  4.62e-02  5.46e-02  1.70e-01  1.81e-01   ph/cm2/s
 
Fluence        CPL   9.33e-08  1.51e-07  1.07e-07  2.75e-08  3.73e-07  3.78e-07   erg/cm2
      90%_error_low -1.13e-08 -1.31e-08 -2.03e-08 -1.67e-08 -3.61e-08 -3.98e-08   erg/cm2
      90%_error_hi   1.13e-08  1.34e-08  1.94e-08  3.70e-08  3.88e-08  5.20e-08   erg/cm2
Peak flux      CPL   6.83e-01  5.51e-01  1.83e-01  2.32e-02  1.44e+00  1.44e+00   ph/cm2/s
      90%_error_low -1.17e-01 -8.05e-02 -6.22e-02 -2.32e-02 -1.70e-01 -1.72e-01   ph/cm2/s
      90%_error_hi   1.16e-01  8.32e-02  5.75e-02  6.11e-02  1.71e-01  1.75e-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
   44.7845    57.1039   0.0079    16.7802    95.7990         0.8894706     24.376 TRIG_00506519                 
 
Foreground time interval of the image:
 20.724  29.196 (delta_t =   8.472 [sec])
Background time interval of the image:
-239.000  20.724 (delta_t = 259.724 [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   20.724 sec. to   29.196 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.1106     ( -0.133365   0.128374 )
Norm@50keV  : 5.35810E-03    ( -0.000487756   0.000482017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.52 using 59 PHA bins.
# Reduced chi-squared =          1.149 for     57 degrees of freedom 
# Null hypothesis probability =   2.053230e-01
 
Photon flux (15-150 keV)    in 8.472 sec: 0.847480 ( -0.059366  0.059384 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.22276e-07 ( -3.46114e-08  3.5145e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   20.724 sec. to   29.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.767936     ( -0.658423   0.776396 )
Epeak [keV] : 36.1255      ( -6.05584 5.31864 )
Norm@50keV  : 3.36543E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.39 using 59 PHA bins.
# Reduced chi-squared =         0.9177 for     56 degrees of freedom 
# Null hypothesis probability =   6.497130e-01
 
Photon flux (15-150 keV)    in 8.472 sec: 0.807569 ( -0.0615  0.061764 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.73041e-07 ( -3.60594e-08  3.87683e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   23.616 sec. to   24.616 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.2158     ( -0.229761   0.212138 )
Norm@50keV  : 8.81172E-03    ( -0.00149405   0.0014695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.96 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     57 degrees of freedom 
# Null hypothesis probability =   3.688028e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.47118 ( -0.1703  0.17033 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.30539e-08 ( -1.19718e-08  1.23267e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   23.616 sec. to   24.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0047     ( -0.961115   1.25558 )
Epeak [keV] : 30.4417      (   )
Norm@50keV  : 5.02455E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.05 using 59 PHA bins.
# Reduced chi-squared =         0.9831 for     56 degrees of freedom 
# Null hypothesis probability =   5.106766e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.43640 ( -0.17001  0.17081 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 7.196 sec.
Hardness ratio (energy fluence ratio) = 0.926232361572

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

    S(15-50 keV)  = 2.341748e-07
S(50-150 keV) = 1.8810779e-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 = -3.046755108003812E-02, IMY = -2.999984922962267E-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 20.724000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.2216  41.0408   10.9  56.7 -169.3   0.8602   1.1    7.3	Cyg X-3                       
326.1175  38.3298   11.4  54.5  173.9   0.8614   1.0    2.6	Cyg X-2                       
 10.3417  41.4026    2.4  38.9  131.9   2.1969   4.7 ------	UNKNOWN                       
351.9341  53.4852    2.3  33.3  159.8   1.4085   5.0 ------	UNKNOWN                       
 74.4451  60.9227    2.2  13.3   34.1   0.9734   5.2 ------	UNKNOWN                       
 68.3104  65.6060    3.0   8.0   39.5   0.6947   3.9 ------	UNKNOWN                       
127.9744  49.8511    2.6  37.0  -22.1   1.2120   4.5 ------	UNKNOWN                       
278.9817  50.8805    3.1  53.2 -142.2   4.8038   3.7 ------	UNKNOWN                       
269.6343  56.2086    3.7  49.2 -133.8   2.9706   3.1 ------	UNKNOWN

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

    Time interval of the image:
20.724000 29.196000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
307.9973  40.9430   22.8  56.9 -169.1   0.0675   0.5    5.2	Cyg X-3                       
326.0339  38.3141    4.6  54.5  174.0  -0.3483  -2.5    6.5	Cyg X-2                       
 31.9307  35.6803    2.4  39.6  103.7   0.5698   4.8 ------	UNKNOWN                       
 44.7845  57.1039    0.5  16.8   95.8   0.8896  24.3 ------	UNKNOWN                       
300.2826  40.8474    2.7  58.8 -162.6   0.7611   4.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
144.500600 235.900600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6245  21.9846    0.7  45.1   19.0   3.6014  15.6    1.9	Crab                          
326.1782  38.4549    9.6  52.7  179.4  -0.4085  -1.2    8.0	Cyg X-2                       
291.5697  56.0320    3.3  54.8 -144.7   2.0520   3.5 ------	UNKNOWN