Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jun  1 15:43:03 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger683383
======================================================================

  Trigger: 00683383      Segment: 000

  BAT Trigger Time: 482771813.568   [s; MET]
      Trigger Stop: 482771814.592   [s; MET]
               UTC: 2016-04-19T15:16:37.419400    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 16.4243148860276   Dec: -27.3425780118945  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    16.19
     Image Trigger?:     NO
     Rate S/N Ratio:     48.0728613668877  [ if not an image trigger ]
     Image S/N Ratio:    16.19

  Analysis Position:   [ source = BAT ]
    RA: 16.4243148860276   Dec: -27.3425780118945  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 16.4185764496253   Dec: -27.341059626836  [deg; J2000]  
        { 01h 05m 40.5s , -27d 20' 27.8" }
         +/- 1.02144766824128 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.409630410738748 [arcmin] (formal 1-sigma fit error)
    SNR: 29.5088641021768
 
  Angular difference between the analysis and refined position is 0.319122 arcmin
 
  Partial Coding Fraction: 0.1699219    [ including projection effects ]

  Duration
     T90: 9.41599994897842 +/- 1.58733111328118
        Measured from: -3.02000004053116
                   to: 6.39599990844727     [s; relative to TRIGTIME]
     T50: 3.51599997282028 +/- 0.438634246924383
        Measured from: -0.696000039577484
                   to: 2.8199999332428     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0     
                   to: 1     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.48800003528595     
                   to: 9.33599996566772     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.905908   1.854726   1.745768   0.548008
           0.064458   0.073937   0.068936   0.052913 [error]
 Peak      0.156567   0.360813   0.373904   0.165143
           0.020002   0.025364   0.025342   0.019046 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.824   -4.488    9.336
T90     9.416   -3.020    6.396
T50     3.516   -0.696    2.820
Peak    1.000    0.000    1.000
 
 
====== 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      -1.316    -0.072      0.072       -           -               -         2.76e-02     -1.20e-03          1.20e-03      51.560   57
CPL     -0.694    -0.308      0.331      118.417     -22.978        59.780      5.31e-02     -1.43e-02          2.13e-02      38.940   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      -1.077     -0.122     0.124       -           -               -         7.48e-02     -5.57e-03          5.56e-03      54.430   57
CPL     -0.804     -0.331     0.517      255.311    -255.311      -255.311      9.91e-02     -2.83e-02          6.65e-02      53.460   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   4.10e-07  8.44e-07  1.36e-06  4.87e-06  3.76e-06  7.48e-06   erg/cm2
      90%_error_low -3.37e-08 -4.30e-08 -6.62e-08 -5.00e-07 -1.69e-07 -5.41e-07   erg/cm2
      90%_error_hi   3.45e-08  4.28e-08  6.59e-08  5.35e-07  1.69e-07  5.69e-07   erg/cm2
Peak flux       PL   2.06e+00  2.66e+00  2.52e+00  4.23e+00  8.66e+00  1.15e+01   ph/cm2/s
      90%_error_low -3.00e-01 -2.48e-01 -1.97e-01 -6.56e-01 -6.68e-01 -8.74e-01   ph/cm2/s
      90%_error_hi   3.15e-01  2.46e-01  1.96e-01  7.25e-01  6.69e-01  8.83e-01   ph/cm2/s
 
Fluence        CPL   3.55e-07  8.84e-07  1.45e-06  2.39e-06  3.68e-06  5.09e-06   erg/cm2
      90%_error_low -4.14e-08 -4.89e-08 -8.14e-08 -6.46e-07 -1.77e-07 -6.51e-07   erg/cm2
      90%_error_hi   4.26e-08  4.94e-08  8.23e-08  9.44e-07  1.77e-07  9.29e-07   erg/cm2
Peak flux      CPL   1.92e+00  2.71e+00  2.62e+00  3.26e+00  8.60e+00  1.05e+01   ph/cm2/s
      90%_error_low -3.71e-01 -2.65e-01 -2.56e-01 -1.15e+00 -6.75e-01 -1.34e+00   ph/cm2/s
      90%_error_hi   3.89e-01  2.69e-01  2.60e-01  1.21e+00  6.77e-01  1.47e+00   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
   16.4186   -27.3411   0.0065    48.6977  -144.5964         5.3596392     29.509 TRIG_00683383                 
 
Foreground time interval of the image:
 -4.488   9.336 (delta_t =  13.824 [sec])
Background time interval of the image:
-239.568  -4.488 (delta_t = 235.080 [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   -4.488 sec. to    9.336 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.31567     ( -0.0716903   0.0721035 )
Norm@50keV  : 2.76317E-02    ( -0.00119578   0.00119535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.56 using 59 PHA bins.
# Reduced chi-squared =         0.9045 for     57 degrees of freedom 
# Null hypothesis probability =   6.786399e-01
 
Photon flux (15-150 keV)    in 13.82 sec: 3.30628 ( -0.15393  0.15428 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.75983e-06 ( -1.68972e-07  1.69227e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.488 sec. to    9.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.694089     ( -0.308372   0.331181 )
Epeak [keV] : 118.417      ( -22.9781 59.7797 )
Norm@50keV  : 5.30576E-02    ( -0.0143496   0.021259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.94 using 59 PHA bins.
# Reduced chi-squared =         0.6953 for     56 degrees of freedom 
# Null hypothesis probability =   9.597978e-01
 
Photon flux (15-150 keV)    in 13.82 sec: 3.22125 ( -0.1587  0.15914 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.67635e-06 ( -1.77402e-07  1.76725e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.000 sec. to    1.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0772     ( -0.121522   0.123782 )
Norm@50keV  : 7.48083E-02    ( -0.00557478   0.00555897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.43 using 59 PHA bins.
# Reduced chi-squared =         0.9549 for     57 degrees of freedom 
# Null hypothesis probability =   5.720452e-01
 
Photon flux (15-150 keV)    in 1 sec: 8.65909 ( -0.66759  0.66889 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.88007e-07 ( -6.07967e-08  6.09584e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.000 sec. to    1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.804359     ( -0.330759   0.516872 )
Epeak [keV] : 255.311      ( -255.328 -255.328 )
Norm@50keV  : 9.91101E-02    ( -0.0282515   0.0665094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.46 using 59 PHA bins.
# Reduced chi-squared =         0.9547 for     56 degrees of freedom 
# Null hypothesis probability =   5.715218e-01
 
Photon flux (15-150 keV)    in 1 sec: 8.59763 ( -0.67509  0.67658 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.82961e-07 ( -6.23349e-08  6.20454e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 9.416 sec.
Hardness ratio (energy fluence ratio) = 1.64266948281

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

    S(15-50 keV)  = 1.2390802e-06
S(50-150 keV) = 2.4372616e-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 = -9.277234385408906E-01, IMY = 6.593853904039598E-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:
-239.568000 -4.488000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6310  22.0124    0.4  40.3   -7.3   9.5505  30.0    0.2	Crab                          
103.3964 -17.1325    3.3  34.7   67.5   1.7367   3.5 ------	UNKNOWN                       
 59.4667 -58.4759    2.5  43.9  154.8   2.6200   4.7 ------	UNKNOWN                       
 93.9076  -1.0077    2.0  29.8   33.4   1.5197   5.7 ------	UNKNOWN                       
105.4362  26.8807    2.6  55.9   10.6   5.4617   4.5 ------	UNKNOWN                       
 93.7630   6.6774    2.3  34.0   21.2   1.5013   5.1 ------	UNKNOWN                       
 27.6119 -61.1886    2.5  54.2  171.2   4.7931   4.5 ------	UNKNOWN                       
 18.2186 -59.1897    2.8  56.9  176.4   5.8094   4.2 ------	UNKNOWN                       
 32.3825 -53.4708    4.0  47.3  176.5   1.4083   2.9 ------	UNKNOWN                       
  7.0498 -42.7812    3.0  58.2 -162.6   5.5185   3.9 ------	UNKNOWN                       
 18.3203 -29.8025    2.5  47.3 -148.1   2.4982   4.6 ------	UNKNOWN

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

    Time interval of the image:
-4.488000 9.336000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6317  22.0117   49.4  40.3   -7.3  -0.0172  -0.2    0.2	Crab                          
 14.8876 -55.8423    2.1  57.0 -179.1   1.4844   5.5 ------	UNKNOWN                       
  7.9044 -43.0886    2.6  57.6 -163.0   1.2860   4.4 ------	UNKNOWN                       
 16.4186 -27.3411    0.4  48.7 -144.6   5.3591  29.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
512.732600 845.932600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
197.7994  40.4886    2.9  29.8   33.6   1.3235   3.9 ------	UNKNOWN                       
204.2463  60.9375    3.0  35.0   -4.7   1.4709   3.8 ------	UNKNOWN                       
197.5203  71.0170    2.7  37.0  -22.1   1.5307   4.3 ------	UNKNOWN                       
118.8128  12.1922    2.7  44.5 -158.8   2.1895   4.3 ------	UNKNOWN