Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jun  1 15:56:40 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger682522
======================================================================

  Trigger: 00682522      Segment: 000

  BAT Trigger Time: 482127850.816   [s; MET]
      Trigger Stop: 482127851.84   [s; MET]
               UTC: 2016-04-12T04:23:54.702760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 33.1066844471939   Dec: -67.6453927684835  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.8
     Image Trigger?:     NO
     Rate S/N Ratio:     11.5758369027902  [ if not an image trigger ]
     Image S/N Ratio:    6.8

  Analysis Position:   [ source = BAT ]
    RA: 33.1066844471939   Dec: -67.6453927684835  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 33.0739519548768   Dec: -67.6399829147724  [deg; J2000]  
        { 02h 12m 17.7s , -67d 38' 23.9" }
         +/- 0.878001438146648 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.253779864034574 [arcmin] (formal 1-sigma fit error)
    SNR: 36.6302163607862
 
  Angular difference between the analysis and refined position is 0.814520 arcmin
 
  Partial Coding Fraction: 0.7578125    [ including projection effects ]

  Duration
     T90: 32.1799999475479 +/- 3.93007892771808
        Measured from: -1.38400000333786
                   to: 30.7959999442101     [s; relative to TRIGTIME]
     T50: 12.4559999704361 +/- 1.37689506130348
        Measured from: 5.89200001955032
                   to: 18.3479999899864     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 14.4000000357628     
                   to: 15.4000000357628     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.30799996852875     
                   to: 40.1759999990463     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.177317   1.363932   0.715318   0.191249
           0.043307   0.045397   0.039402   0.035022 [error]
 Peak      0.068441   0.069519   0.046938   0.007019
           0.007269   0.007640   0.006620   0.005653 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   44.484   -4.308   40.176
T90    32.180   -1.384   30.796
T50    12.456    5.892   18.348
Peak    1.000   14.400   15.400
 
 
====== 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      -1.879    -0.083      0.083       -           -               -         4.74e-03     -2.24e-04          2.23e-04      58.400   57
CPL     -1.724    -0.320      0.350       80.278     -28.998       -80.278      5.76e-03     -1.09e-03          3.09e-03      57.740   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      -1.887     -0.220     0.207       -           -               -         1.12e-02     -1.61e-03          1.57e-03      72.760   57
CPL     -1.274     -0.801     0.984       51.606      N/A           N/A         2.48e-02        N/A               N/A         71.170   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   3.85e-07  5.62e-07  6.11e-07  1.24e-06  1.94e-06  2.80e-06   erg/cm2
      90%_error_low -2.70e-08 -2.40e-08 -4.00e-08 -1.64e-07 -9.12e-08 -2.00e-07   erg/cm2
      90%_error_hi   2.76e-08  2.40e-08  4.02e-08  1.81e-07  9.17e-08  2.12e-07   erg/cm2
Peak flux       PL   6.68e-01  5.35e-01  2.89e-01  2.29e-01  1.60e+00  1.72e+00   ph/cm2/s
      90%_error_low -1.11e-01 -6.21e-02 -5.41e-02 -7.30e-02 -1.85e-01 -2.03e-01   ph/cm2/s
      90%_error_hi   1.15e-01  6.21e-02  5.46e-02  9.10e-02  1.85e-01  2.04e-01   ph/cm2/s
 
Fluence        CPL   3.77e-07  5.71e-07  6.10e-07  9.40e-07  1.91e-06  2.50e-06   erg/cm2
      90%_error_low -3.16e-08 -2.94e-08 -4.13e-08 -4.01e-07 -1.15e-07 -4.22e-07   erg/cm2
      90%_error_hi   3.20e-08  3.05e-08  4.11e-08  3.49e-07  1.12e-07  3.85e-07   erg/cm2
Peak flux      CPL   6.25e-01  5.75e-01  2.92e-01  1.06e-01  1.56e+00  1.60e+00   ph/cm2/s
      90%_error_low -1.29e-01 -8.11e-02 -6.01e-02 -1.06e-01 -1.90e-01 -2.09e-01   ph/cm2/s
      90%_error_hi   1.29e-01  8.40e-02  5.98e-02  1.52e-01  1.90e-01  2.54e-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
   33.0740   -67.6400   0.0052    25.3605   151.1442         2.2591009     36.630 TRIG_00682522                 
 
Foreground time interval of the image:
 -4.308  15.885 (delta_t =  20.193 [sec])
Background time interval of the image:
-239.816  -4.308 (delta_t = 235.508 [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   -4.308 sec. to   40.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87882     ( -0.0834461   0.0825128 )
Norm@50keV  : 4.74292E-03    ( -0.000224292   0.00022272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.40 using 59 PHA bins.
# Reduced chi-squared =          1.024 for     57 degrees of freedom 
# Null hypothesis probability =   4.238722e-01
 
Photon flux (15-150 keV)    in 44.48 sec: 0.674661 ( -0.029738  0.0298 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.93975e-06 ( -9.11809e-08  9.16506e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.308 sec. to   40.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72351     ( -0.31965   0.350416 )
Epeak [keV] : 80.2785      ( -29.0075 -80.2883 )
Norm@50keV  : 5.75585E-03    ( -0.001087   0.0030937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.74 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     56 degrees of freedom 
# Null hypothesis probability =   4.106951e-01
 
Photon flux (15-150 keV)    in 44.48 sec: 0.668110 ( -0.032689  0.032648 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.90614e-06 ( -1.14774e-07  1.12201e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   14.400 sec. to   15.400 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.88711     ( -0.219727   0.207228 )
Norm@50keV  : 1.11776E-02    ( -0.00161178   0.00157103 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.76 using 59 PHA bins.
# Reduced chi-squared =          1.276 for     57 degrees of freedom 
# Null hypothesis probability =   7.791371e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.59549 ( -0.18532  0.18535 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02773e-07 ( -1.44142e-08  1.47168e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   14.400 sec. to   15.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27391     ( -0.801029   0.983939 )
Epeak [keV] : 51.6059      (   )
Norm@50keV  : 2.47596E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.17 using 59 PHA bins.
# Reduced chi-squared =          1.271 for     56 degrees of freedom 
# Null hypothesis probability =   8.334988e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.56277 ( -0.19029  0.19034 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.73509e-08 ( -1.54101e-08  1.62574e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 32.18 sec.
Hardness ratio (energy fluence ratio) = 1.08767740624

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

    S(15-50 keV)  = 9.466922e-07
S(50-150 keV) = 9.930274e-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 = -4.151392283191319E-01, IMY = -2.287511584243762E-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:
-239.816000 -4.308000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 68.2849 -75.5712    2.8  32.5  127.5   1.3062   4.1 ------	UNKNOWN                       
 94.9378 -34.6430    2.6  35.1   45.7   1.4638   4.5 ------	UNKNOWN                       
305.9875 -71.4878    2.3  53.0  158.3   5.1762   5.0 ------	UNKNOWN                       
 32.8540 -67.6461    2.2  25.4  151.3   1.1841   5.3 ------	UNKNOWN                       
 51.3912 -18.3802    2.9  25.7  -42.5   0.8324   4.1 ------	UNKNOWN                       
332.9799 -42.7502    2.6  54.2 -162.2   2.7470   4.4 ------	UNKNOWN

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

    Time interval of the image:
-4.308000 15.884600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.2331 -77.5627    2.5  51.5  150.5   1.3728   4.5 ------	UNKNOWN                       
 98.7737 -29.2305    2.1  40.8   41.0   0.7046   5.5 ------	UNKNOWN                       
 33.0739 -67.6400    0.3  25.4  151.1   2.2592  36.6 ------	UNKNOWN                       
 19.6185 -12.9774    2.7  40.8  -94.4   0.9093   4.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
67.284590 962.287300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 99.8782 -45.7464    3.0  39.9   14.1   2.9084   3.8 ------	UNKNOWN                       
102.0583 -29.0766    3.7  55.3    5.1   6.0495   3.1 ------	UNKNOWN                       
308.9159 -44.6982    3.3  47.3  176.6   3.9341   3.5 ------	UNKNOWN                       
 95.5286 -28.2539    2.4  53.6   -1.7   6.3809   4.9 ------	UNKNOWN                       
  8.9086 -61.6891    3.6  11.8 -149.0   1.5587   3.2 ------	UNKNOWN                       
314.3187 -30.8657    2.8  57.5 -170.3  10.4804   4.1 ------	UNKNOWN                       
323.2848 -25.7075    3.5  58.7 -159.3  14.5610   3.3 ------	UNKNOWN