Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Nov 27 19:36:16 EST 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger929744
======================================================================

  Trigger: 00929744      Segment: 000

  BAT Trigger Time: 592891764.672   [s; MET]
      Trigger Stop: 592891781.056   [s; MET]
               UTC: 2019-10-16T04:09:00.915720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 30.2956005884388   Dec: 24.5009472918732  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.91
     Image Trigger?:     NO
     Rate S/N Ratio:     19.3907194296653  [ if not an image trigger ]
     Image S/N Ratio:    17.91

  Analysis Position:   [ source = BAT ]
    RA: 30.2956005884388   Dec: 24.5009472918732  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 30.2760895965852   Dec: 24.4978632545997  [deg; J2000]  
        { 02h 01m 06.3s , +24d 29' 52.3" }
         +/- 0.933854488414703 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.268579828678173 [arcmin] (formal 1-sigma fit error)
    SNR: 33.5410497434109
 
  Angular difference between the analysis and refined position is 1.081212 arcmin
 
  Partial Coding Fraction: 0.6484375    [ including projection effects ]

  Duration
     T90: 126.679999947548 +/- 7.72798026488531
        Measured from: -28.9760000705719
                   to: 97.703999876976     [s; relative to TRIGTIME]
     T50: 46.107999920845 +/- 3.49813667098309
        Measured from: -9.86000001430511
                   to: 36.2479999065399     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -7.75200009346008     
                   to: -6.75200009346008     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -42.8280000686646     
                   to: 118.815999984741     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.807508   3.405934   2.472948   0.588522
           0.099742   0.104365   0.092918   0.082995 [error]
 Peak      0.051558   0.067499   0.046552   0.014588
           0.008435   0.008721   0.007994   0.006922 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  161.644  -42.828  118.816
T90   126.680  -28.976   97.704
T50    46.108   -9.860   36.248
Peak    1.000   -7.752   -6.752
 
 
====== 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      -1.637    -0.070      0.070       -           -               -         3.77e-03     -1.42e-04          1.42e-04      39.730   57
CPL     -1.449    -0.221      0.282      148.007     -60.139      -148.007      4.67e-03     -9.89e-04          1.71e-03      38.270   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      -1.642     -0.262     0.251       -           -               -         1.13e-02     -1.86e-03          1.82e-03      44.520   57
CPL     -1.000     -0.553     1.342       69.938     -24.949       -69.938      2.55e-02     -1.56e-02          1.14e-01      43.440   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   8.85e-07  1.50e-06  1.92e-06  4.98e-06  5.68e-06  9.29e-06   erg/cm2
      90%_error_low -5.90e-08 -5.86e-08 -9.67e-08 -5.33e-07 -2.27e-07 -6.03e-07   erg/cm2
      90%_error_hi   6.04e-08  5.84e-08  9.66e-08  5.76e-07  2.28e-07  6.37e-07   erg/cm2
Peak flux       PL   5.32e-01  4.92e-01  3.15e-01  3.11e-01  1.47e+00  1.65e+00   ph/cm2/s
      90%_error_low -1.16e-01 -7.24e-02 -6.67e-02 -1.12e-01 -2.14e-01 -2.48e-01   ph/cm2/s
      90%_error_hi   1.22e-01  7.23e-02  6.68e-02  1.46e-01  2.14e-01  2.51e-01   ph/cm2/s
 
Fluence        CPL   8.54e-07  1.52e-06  1.94e-06  3.74e-06  5.59e-06  8.06e-06   erg/cm2
      90%_error_low -7.31e-08 -6.67e-08 -1.01e-07 -1.20e-06 -2.62e-07 -1.23e-06   erg/cm2
      90%_error_hi   7.42e-08  6.74e-08  1.02e-07  1.36e-06  2.61e-07  1.47e-06   erg/cm2
Peak flux      CPL   4.92e-01  5.30e-01  3.21e-01  1.40e-01  1.43e+00  1.48e+00   ph/cm2/s
      90%_error_low -1.37e-01 -9.40e-02 -7.47e-02 -1.40e-01 -2.22e-01 -2.55e-01   ph/cm2/s
      90%_error_hi   1.38e-01  1.00e-01  7.41e-02  2.13e-01  2.21e-01  3.27e-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
   30.2761    24.4979   0.0057    26.8488    52.3059         9.3946127     33.541 TRIG_00929744                 
 
Foreground time interval of the image:
-42.828 118.816 (delta_t = 161.644 [sec])
Background time interval of the image:
-239.672 -42.828 (delta_t = 196.844 [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  -42.828 sec. to  118.816 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.63699     ( -0.0703817   0.0700279 )
Norm@50keV  : 3.77248E-03    ( -0.000142206   0.000141702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.73 using 59 PHA bins.
# Reduced chi-squared =         0.6970 for     57 degrees of freedom 
# Null hypothesis probability =   9.602616e-01
 
Photon flux (15-150 keV)    in 161.6 sec: 0.490519 ( -0.019058  0.019107 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.6782e-06 ( -2.27014e-07  2.27904e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -42.828 sec. to  118.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44873     ( -0.220547   0.282171 )
Epeak [keV] : 148.007      ( -60.1408 -148.008 )
Norm@50keV  : 4.67269E-03    ( -0.000989484   0.00171448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.27 using 59 PHA bins.
# Reduced chi-squared =         0.6835 for     56 degrees of freedom 
# Null hypothesis probability =   9.662955e-01
 
Photon flux (15-150 keV)    in 161.6 sec: 0.484145 ( -0.020972  0.020998 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.58536e-06 ( -2.6206e-07  2.61209e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -7.752 sec. to   -6.752 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64225     ( -0.261689   0.25073 )
Norm@50keV  : 1.12722E-02    ( -0.00185889   0.00181848 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.52 using 59 PHA bins.
# Reduced chi-squared =         0.7811 for     57 degrees of freedom 
# Null hypothesis probability =   8.855612e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.46820 ( -0.21403  0.21406 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04932e-07 ( -1.82418e-08  1.86798e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -7.752 sec. to   -6.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.999609     ( -0.553449   1.34157 )
Epeak [keV] : 69.9379      ( -24.9489 -69.9378 )
Norm@50keV  : 2.54901E-02    ( -0.0156394   0.113619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.44 using 59 PHA bins.
# Reduced chi-squared =         0.7757 for     56 degrees of freedom 
# Null hypothesis probability =   8.896878e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.43419 ( -0.22191  0.22098 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.8485e-08 ( -2.0288e-08  2.13159e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 126.68 sec.
Hardness ratio (energy fluence ratio) = 1.28611571275

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

    S(15-50 keV)  = 2.3817896e-06
S(50-150 keV) = 3.296437e-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 = 3.095179242538902E-01, IMY = -4.005542555865793E-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:
-239.672000 -42.828000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
325.9643  38.2031   16.7  35.6  -75.1  -0.3733  -0.7   12.1	Cyg X-2                       
 37.6460  43.7343    2.8  38.1   20.4   1.5298   4.2 ------	UNKNOWN                       
  3.5991  33.8738    2.9  13.8  -16.1   0.8896   4.0 ------	UNKNOWN                       
334.8059 -12.9806    3.1  42.4 -162.6   1.3646   3.7 ------	UNKNOWN                       
  5.7115  71.8683    2.7  51.7  -21.6   2.8564   4.2 ------	UNKNOWN                       
346.9930  66.2259    2.7  46.9  -31.2   2.2069   4.2 ------	UNKNOWN

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

    Time interval of the image:
-42.828000 118.816000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.3358  38.2995   12.0  35.3  -74.7  -0.4929  -1.0    7.8	Cyg X-2                       
 30.2761  24.4979    0.3  26.8   52.3   9.3951  33.5 ------	UNKNOWN                       
 11.4599  -3.8546    2.4  26.0  133.7   1.3055   4.9 ------	UNKNOWN                       
333.1286 -26.0983    3.0  53.9 -171.3   2.6527   3.9 ------	UNKNOWN                       
348.6010  27.6061    2.5  13.9  -78.8   1.0691   4.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image: