Analysis Summary

Notes:

==========================================================================
           BAT GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Oct  6 19:32:14 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================

  Trigger: 00570531      Segment: 000

  BAT Trigger Time: 400724908.8
               UTC: 2013-09-13T00:28:17.775   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA:    Dec:   [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 341.983598004   Dec: 1.16774168935  [deg; J2000]
        { 22h 47m 56.1s , +01d 10' 03.9" }
        +/- 4.77385009079 [arcmin] (estimated 90% radius based on SNR)
    SNR: 3.26108905588
 
 
  Angular difference between the analysis and refined position is 1083.177190 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 41.6000000238419 +/- 1.6
        Measured from: 1.6
                   to: 43.2     [s; relative to TRIGTIME]
     T50: 22.4000000357628 +/- 1.6
        Measured from: 11.2
                   to: 33.6     [s; relative to TRIGTIME]
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   44.800    0.000   44.800
T90    41.600    1.600   43.200
T50    22.400   11.200   33.600
Peak    1.000    3.500    4.500
 
 
====== 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      -0.863    -0.504      0.558       -           -               -         1.11e-03     -3.17e-04          3.07e-04      64.310   57
CPL     -0.688     0.688      2.869      452.176      N/A           N/A         1.31e-03        N/A               N/A         64.290   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      -0.297     -1.906     0.297       -           -               -         1.07e-03     -1.07e-03          1.07e-03      60.860   57
CPL     -0.306      N/A       N/A        9999.360      N/A           N/A         1.09e-03        N/A               N/A         60.860   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   7.82e-09  2.13e-08  4.68e-08  2.71e-07  1.26e-07  3.47e-07   erg/cm2
      90%_error_low -4.18e-09 -7.72e-09 -1.42e-08 -1.51e-07 -3.74e-08 -1.61e-07   erg/cm2
      90%_error_hi   5.22e-09  7.36e-09  1.38e-08  2.66e-07  3.81e-08  2.66e-07   erg/cm2
Peak flux       PL   1.41e-02  2.94e-02  4.79e-02  1.75e-01  1.32e-01  2.67e-01   ph/cm2/s
      90%_error_low -1.41e-02 -2.94e-02 -4.79e-02 -1.75e-01 -1.32e-01 -2.67e-01   ph/cm2/s
      90%_error_hi   5.77e-02  4.54e-02  3.63e-02  1.09e+00  1.14e-01  7.72e-01   ph/cm2/s
 
Fluence        CPL   7.44e-09  2.15e-08  4.77e-08  2.16e-07  1.25e-07  2.93e-07   erg/cm2
      90%_error_low -4.11e-09 -7.85e-09 -1.49e-08    N/A    -4.03e-08 -1.97e-07   erg/cm2
      90%_error_hi   6.16e-09  8.13e-09  1.79e-08    N/A     3.89e-08  1.79e-07   erg/cm2
Peak flux      CPL   1.86e-02  3.14e-02  4.79e-02  1.72e-01  1.33e-01  2.78e-01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    15.0-350.0 keV image (Event data)

    #RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
    341.913 1.245 0.051 13.664 -134.912 0.067 3.780 TRIG_00570531
     
    Image time interval: 1.200 to 4.501 [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.

    Best duration plot

    Full-time range; 1 s binning

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from    1.200 sec. to   11.221 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.862707     ( -0.503938   0.558231 )
    Norm@50keV  : 1.10659E-03    ( -0.000316498   0.000307457 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.31 using 59 PHA bins.
    # Reduced chi-squared =          1.128 for     57 degrees of freedom 
    # Null hypothesis probability =   2.358804e-01
     
    Photon flux (15-150 keV)    in 10.02 sec: 0.127009 ( -0.0352652  0.035507 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.26292e-07 ( -3.73643e-08  3.81026e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    1.200 sec. to   11.221 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.64909     ( 2.64911   4.83008 )
    Epeak [keV] : 189.216      (   )
    Norm@50keV  : 6.36961E-05    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.17 using 59 PHA bins.
    # Reduced chi-squared =          1.146 for     56 degrees of freedom 
    # Null hypothesis probability =   2.119910e-01
     
    Photon flux (15-150 keV)    in 10.02 sec: 0.125930 ( -0.0378316  0.036276 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.25241e-07 ( -4.02979e-08  3.88776e-08 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from    3.500 sec. to    4.500 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.29718     ( -1.90679   0.296506 )
    Norm@50keV  : 1.07190E-03    ( -0.0010715   0.00107013 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          60.86 using 59 PHA bins.
    # Reduced chi-squared =          1.068 for     57 degrees of freedom 
    # Null hypothesis probability =   3.388716e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.132305 ( -0.132305  0.113569 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.60483e-08 ( -1.24072e-08  1.25316e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    3.500 sec. to    4.500 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.305803     (       )
    Epeak [keV] : 9999.36      (   )
    Norm@50keV  : 1.09185E-03    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          60.86 using 59 PHA bins.
    # Reduced chi-squared =          1.087 for     56 degrees of freedom 
    # Null hypothesis probability =   3.053295e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.132762 (    ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.57203e-08 ( -1.57199e-08  1.30935e-08 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = N/A sec.
    Hardness ratio (energy fluence ratio) = N/A
    

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

    S(15-50 keV)  = N/A
    S(50-150 keV) = N/A
    

    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 = -0.171635734287, IMY = 0.17216615615
    

    Spacecraft aspect plot

    Bright source in the event data image

    Event data image of 15-350 keV band

    Time interval of the image:
    1.200000 4.500590
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    
    Webpage updated on:
    Sun Jun 21 01:05:23 EDT 2015