Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 03:07:39 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger556344
======================================================================

  Trigger: 00556344      Segment: 000

  BAT Trigger Time: 390869367.36   [s; MET]
      Trigger Stop: 390869368.384   [s; MET]
               UTC: 2013-05-21T22:49:16.777540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 87.5593927071589   Dec: 14.4524334755583  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.11
     Image Trigger?:     NO
     Rate S/N Ratio:     24.5153013442625  [ if not an image trigger ]
     Image S/N Ratio:    12.11

  Analysis Position:   [ source = BAT ]
    RA: 87.5593927071589   Dec: 14.4524334755583  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 87.5671644965006   Dec: 14.4708670445226  [deg; J2000]  
        { 05h 50m 16.1s , +14d 28' 15.1" }
         +/- 1.61520536666794 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.760141059001048 [arcmin] (formal 1-sigma fit error)
    SNR: 15.3338131634135
 
  Angular difference between the analysis and refined position is 1.194633 arcmin
 
  Partial Coding Fraction: 0.671875    [ including projection effects ]

  Duration
     T90: 10.9559999704361 +/- 2.50452706799813
        Measured from: -0.328000009059906
                   to: 10.6279999613762     [s; relative to TRIGTIME]
     T50: 2.35999995470047 +/- 1.94983590135906
        Measured from: 0.472000002861023
                   to: 2.83199995756149     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.136000037193298     
                   to: 0.863999962806702     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.643999993801117     
                   to: 12.6399999856949     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.345609   0.317768   0.155107   0.034583
           0.027603   0.028142   0.023719   0.019499 [error]
 Peak      0.090310   0.085501   0.041724   0.011170
           0.008862   0.009196   0.007451   0.005254 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.284   -0.644   12.640
T90    10.956   -0.328   10.628
T50     2.360    0.472    2.832
Peak    1.000   -0.136    0.864
 
 
====== 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      -2.088    -0.198      0.188       -           -               -         3.45e-03     -4.58e-04          4.47e-04      50.700   57
CPL     -1.862    -0.216      0.770       24.954      N/A           N/A         4.68e-03        N/A               N/A         50.370   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      -2.153     -0.228     0.210       -           -               -         1.19e-02     -1.90e-03          1.84e-03      48.660   57
CPL     -1.636     -0.597     0.990       29.095     -25.429       -29.095      2.40e-02        N/A               N/A         47.520   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   1.02e-07  1.31e-07  1.23e-07  2.05e-07  4.25e-07  5.61e-07   erg/cm2
      90%_error_low -1.37e-08 -1.31e-08 -2.21e-08 -6.40e-08 -5.05e-08 -9.18e-08   erg/cm2
      90%_error_hi   1.40e-08  1.31e-08  2.27e-08  8.12e-08  5.16e-08  1.05e-07   erg/cm2
Peak flux       PL   9.24e-01  6.34e-01  2.85e-01  1.78e-01  1.93e+00  2.02e+00   ph/cm2/s
      90%_error_low -1.42e-01 -7.40e-02 -5.82e-02 -6.00e-02 -2.21e-01 -2.33e-01   ph/cm2/s
      90%_error_hi   1.45e-01  7.37e-02  5.92e-02  7.54e-02  2.21e-01  2.33e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -1.37e-08 -1.31e-08 -2.21e-08 -6.40e-08 -5.05e-08 -9.18e-08   erg/cm2
      90%_error_hi   1.40e-08  1.31e-08  2.27e-08  8.12e-08  5.16e-08  1.05e-07   erg/cm2
Peak flux      CPL   8.85e-01  6.76e-01  2.84e-01  8.90e-02  1.91e+00  1.93e+00   ph/cm2/s
      90%_error_low -1.59e-01 -9.48e-02 -6.62e-02 -8.90e-02 -2.24e-01 -2.38e-01   ph/cm2/s
      90%_error_hi   1.57e-01  1.03e-01  6.42e-02  1.72e-01  2.24e-01  2.57e-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
       87.5672    14.4709   0.0125    22.9651   -82.6553         0.8141038     15.334 TRIG_00556344                 
     
    Foreground time interval of the image:
     -0.644  12.640 (delta_t =  13.284 [sec])
    Background time interval of the image:
    -210.659  -0.644 (delta_t = 210.015 [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   -0.644 sec. to   12.640 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.08788     ( -0.198462   0.187755 )
    Norm@50keV  : 3.44525E-03    ( -0.000457922   0.000447201 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          50.70 using 59 PHA bins.
    # Reduced chi-squared =         0.8895 for     57 degrees of freedom 
    # Null hypothesis probability =   7.089609e-01
     
    Photon flux (15-150 keV)    in 13.28 sec: 0.538853 ( -0.052789  0.052796 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 4.24686e-07 ( -5.05086e-08  5.15779e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.644 sec. to   12.640 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.86177     ( -0.216086   0.769823 )
    Epeak [keV] : 24.9544      (   )
    Norm@50keV  : 4.68165E-03    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          50.37 using 59 PHA bins.
    # Reduced chi-squared =         0.8994 for     56 degrees of freedom 
    # Null hypothesis probability =   6.871255e-01
     
    Photon flux (15-150 keV)    in 13.28 sec: 0.534402 ( -0.054324  0.053944 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.136 sec. to    0.864 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.15322     ( -0.228189   0.210152 )
    Norm@50keV  : 1.19360E-02    ( -0.00189673   0.00184138 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          48.66 using 59 PHA bins.
    # Reduced chi-squared =         0.8537 for     57 degrees of freedom 
    # Null hypothesis probability =   7.762194e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.92890 ( -0.2211  0.22112 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.11563e-07 ( -1.54549e-08  1.57492e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -0.136 sec. to    0.864 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.63596     ( -0.596757   0.990136 )
    Epeak [keV] : 29.0950      ( -25.428 -29.0944 )
    Norm@50keV  : 2.40163E-02    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          47.52 using 59 PHA bins.
    # Reduced chi-squared =         0.8486 for     56 degrees of freedom 
    # Null hypothesis probability =   7.828199e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.90568 ( -0.22414  0.22412 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 10.956 sec.
    Hardness ratio (energy fluence ratio) = 0.940936426609
    

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

    S(15-50 keV)  = 2.327575e-07
    S(50-150 keV) = 1.9193068e-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 = 5.417203364954370E-02, IMY = 4.202798181786878E-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:
    -210.659410 -0.644000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.6366  22.0178    0.4  31.0  -77.3   8.5240  28.9    0.3	Crab                          
    126.4361 -25.7633    2.9  32.3   99.5   1.4378   4.0 ------	UNKNOWN                       
     80.2897 -49.3385    2.7  51.2  159.7   4.0091   4.3 ------	UNKNOWN                       
    128.0260  49.1245    3.0  55.5  -20.3   2.4155   3.9 ------	UNKNOWN                       
    111.5837  53.0211    2.3  55.6  -33.7   5.6750   4.9 ------	UNKNOWN                       
     55.9775  -0.9222    2.3  47.6 -128.8   4.2925   4.9 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -0.644000 12.640000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.5246  21.9261    3.8  31.0  -77.6   0.2038   3.0    8.0	Crab                          
    137.2958 -12.4180    2.6  35.0   69.2   0.3945   4.4 ------	UNKNOWN                       
    149.7731  10.5896    2.5  47.7   34.0   0.6301   4.7 ------	UNKNOWN                       
     99.5743 -43.9954    2.7  42.0  144.7   0.4354   4.4 ------	UNKNOWN                       
     87.5671  14.4708    0.7  23.0  -82.7   0.8138  15.3 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    153.740600 334.540600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     16.7415  55.4782    2.6  50.7  -44.5   3.8282   4.4 ------	UNKNOWN