Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Mar 28 14:19:19 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger679120
======================================================================

  Trigger: 00679120      Segment: 000

  BAT Trigger Time: 479647987.776   [s; MET]
      Trigger Stop: 479647989.824   [s; MET]
               UTC: 2016-03-14T11:32:51.798460    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 112.780775633225   Dec: 17.00092392601  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.54
     Image Trigger?:     NO
     Rate S/N Ratio:     14.1774468787578  [ if not an image trigger ]
     Image S/N Ratio:    8.54

  Analysis Position:   [ source = BAT ]
    RA: 112.780775633225   Dec: 17.00092392601  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 112.766207779711   Dec: 17.0234503011397  [deg; J2000]  
        { 07h 31m 03.9s , +17d 01' 24.4" }
         +/- 1.72851934259036 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.817643453877885 [arcmin] (formal 1-sigma fit error)
    SNR: 13.9182215729122
 
  Angular difference between the analysis and refined position is 1.589144 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 8.73199993371964 +/- 1.51638125570509
        Measured from: 0.255999982357025
                   to: 8.98799991607666     [s; relative to TRIGTIME]
     T50: 3.11199992895126 +/- 1.42999997780873
        Measured from: 1.37999999523163
                   to: 4.49199992418289     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.12000000476837     
                   to: 2.12000000476837     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0360000133514404     
                   to: 9.31199997663498     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.140798   0.166740   0.116350   0.052304
           0.018960   0.019376   0.016588   0.013450 [error]
 Peak      0.036316   0.040673   0.027093   0.016098
           0.006666   0.006594   0.005718   0.004544 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    9.348   -0.036    9.312
T90     8.732    0.256    8.988
T50     3.112    1.380    4.492
Peak    1.000    1.120    2.120
 
 
====== 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      -1.528    -0.223      0.220       -           -               -         3.12e-03     -4.03e-04          3.98e-04      62.830   57
CPL     -1.530    -0.220      0.225     9999.360    -9999.360      -9999.360      3.12e-03     -2.25e-03          4.36e-03      62.840   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      -1.505     -0.325     0.328       -           -               -         7.27e-03     -1.29e-03          1.26e-03      68.970   57
CPL     -1.530     -0.302     0.452     9999.360    -9999.360      -9999.360      7.18e-03     -1.19e-03          -7.18e-03      69.010   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   3.82e-08  6.91e-08  9.58e-08  2.77e-07  2.75e-07  4.80e-07   erg/cm2
      90%_error_low -7.67e-09 -8.71e-09 -1.64e-08 -8.89e-08 -3.89e-08 -1.04e-07   erg/cm2
      90%_error_hi   7.99e-09  8.65e-09  1.64e-08  1.15e-07  3.95e-08  1.25e-07   erg/cm2
Peak flux       PL   3.01e-01  3.02e-01  2.12e-01  2.38e-01  9.08e-01  1.05e+00   ph/cm2/s
      90%_error_low -8.85e-02 -5.46e-02 -4.92e-02 -9.78e-02 -1.54e-01 -1.80e-01   ph/cm2/s
      90%_error_hi   9.35e-02  5.32e-02  4.81e-02  1.37e-01  1.54e-01  1.82e-01   ph/cm2/s
 
Fluence        CPL   3.82e-08  6.91e-08  9.53e-08  2.75e-07  2.78e-07  4.83e-07   erg/cm2
      90%_error_low    N/A       N/A    -2.18e-08    N/A       N/A    -2.02e-07   erg/cm2
      90%_error_hi     N/A       N/A     2.28e-08    N/A       N/A     5.50e-08   erg/cm2
Peak flux      CPL   3.01e-01  3.00e-01  2.10e-01  2.35e-01  9.18e-01  1.04e+00   ph/cm2/s
      90%_error_low -8.88e-02 -5.55e-02 -4.83e-02     N/A   -1.59e-01 -1.72e-01   ph/cm2/s
      90%_error_hi   9.34e-02  5.73e-02  5.28e-02     N/A    1.46e-01  1.90e-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
  112.7662    17.0235   0.0138    19.6953    61.4634         0.4841346     13.918 TRIG_00679120                 
 
Foreground time interval of the image:
 -0.036   9.312 (delta_t =   9.348 [sec])
Background time interval of the image:
-239.776  -0.036 (delta_t = 239.740 [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   -0.036 sec. to    9.312 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52836     ( -0.222498   0.219949 )
Norm@50keV  : 3.11909E-03    ( -0.00040331   0.000398262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.83 using 59 PHA bins.
# Reduced chi-squared =          1.102 for     57 degrees of freedom 
# Null hypothesis probability =   2.773965e-01
 
Photon flux (15-150 keV)    in 9.348 sec: 0.392441 ( -0.04844  0.048497 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.75403e-07 ( -3.89101e-08  3.94866e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.036 sec. to    9.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52962     ( -0.220702   0.22448 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 3.12120E-03    ( -0.00225277   0.00435825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.84 using 59 PHA bins.
# Reduced chi-squared =          1.122 for     56 degrees of freedom 
# Null hypothesis probability =   2.470212e-01
 
Photon flux (15-150 keV)    in 9.348 sec: 0.393417 ( -0.051805  0.049339 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.77958e-07 ( 0  0 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.120 sec. to    2.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50511     ( -0.325436   0.327818 )
Norm@50keV  : 7.26617E-03    ( -0.00128593   0.00125803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.97 using 59 PHA bins.
# Reduced chi-squared =          1.210 for     57 degrees of freedom 
# Null hypothesis probability =   1.329721e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.908380 ( -0.153933  0.15404 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.88811e-08 ( -1.34006e-08  1.36428e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.120 sec. to    2.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50428     ( -0.303865   0.45031 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 7.28521E-03    ( -0.00129489   -0.00728523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.99 using 59 PHA bins.
# Reduced chi-squared =          1.232 for     56 degrees of freedom 
# Null hypothesis probability =   1.140564e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.918153 ( -0.159414  0.146057 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.83469e-08 ( -1.50172e-08  1.13856e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 8.732 sec.
Hardness ratio (energy fluence ratio) = 1.38672354267

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

    S(15-50 keV)  = 1.0728559e-07
S(50-150 keV) = 1.6811606e-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 = 1.710043101406890E-01, IMY = -3.144712058619749E-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:
-239.776000 -0.036000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6283  22.0218    0.2  16.4  -40.1   9.9195  50.9    0.5	Crab                          
 83.1061 -29.1693    3.0  39.8 -167.8   1.1021   3.9 ------	UNKNOWN                       
 83.3661  58.2979    3.5  49.9  -10.5   1.3281   3.3 ------	UNKNOWN                       
 55.3358  27.5867    3.6  41.0  -61.1   1.9809   3.2 ------	UNKNOWN

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

    Time interval of the image:
-0.036000 9.312000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7129  21.8682    4.2  16.2  -40.3   0.0792   2.8    9.8	Crab                          
112.7662  17.0234    0.8  19.7   61.5   0.4840  13.9 ------	UNKNOWN                       
 96.3594 -34.1500    2.5  43.3  174.4   0.2424   4.6 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
75.124610 962.291800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6329  22.0212    0.2  27.9  -81.2  36.8827  49.2    0.4	Crab                          
147.4921  38.4268    3.5  37.1   41.5   3.1207   3.3 ------	UNKNOWN                       
129.7179  61.5494    2.7  46.1    4.9   4.2964   4.2 ------	UNKNOWN                       
110.7459 -10.8022    2.9  27.9  178.0   2.4764   3.9 ------	UNKNOWN                       
114.1220  52.0780    2.9  35.1   -4.8   2.5420   3.9 ------	UNKNOWN                       
 97.5733  -3.2984    3.0  25.2 -148.4   2.0208   3.8 ------	UNKNOWN