Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Dec 11 18:43:03 EST 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger938899
======================================================================

  Trigger: 00938899      Segment: 000

  BAT Trigger Time: 596122400.384   [s; MET]
      Trigger Stop: 596122402.432   [s; MET]
               UTC: 2019-11-22T13:32:56.419620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 54.2959315816296   Dec: -32.1758874824898  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.61
     Image Trigger?:     NO
     Rate S/N Ratio:     14.4913767461894  [ if not an image trigger ]
     Image S/N Ratio:    11.61

  Analysis Position:   [ source = BAT ]
    RA: 54.2959315816296   Dec: -32.1758874824898  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 54.2902253560452   Dec: -32.1761132584093  [deg; J2000]  
        { 03h 37m 09.7s , -32d 10' 34.0" }
         +/- 0.976353338448075 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.230404013882231 [arcmin] (formal 1-sigma fit error)
    SNR: 31.4749827367427
 
  Angular difference between the analysis and refined position is 0.290107 arcmin
 
  Partial Coding Fraction: 0.2695312    [ including projection effects ]

  Duration
     T90: 125.735999941826 +/- 31.0497181822785
        Measured from: -6.51999998092651
                   to: 119.215999960899     [s; relative to TRIGTIME]
     T50: 33.5119999647141 +/- 4.28430485486506
        Measured from: 1.62000000476837
                   to: 35.1319999694824     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.44400000572205     
                   to: 7.44400000572205     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.1199998855591     
                   to: 196.104000091553     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.978720   4.203628   2.829380   0.529738
           0.118145   0.125874   0.109069   0.089473 [error]
 Peak      0.093479   0.150167   0.100426   0.023048
           0.013263   0.015540   0.013295   0.009813 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  207.224  -11.120  196.104
T90   125.736   -6.520  119.216
T50    33.512    1.620   35.132
Peak    1.000    6.444    7.444
 
 
====== 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      -1.664    -0.067      0.067       -           -               -         3.44e-03     -1.30e-04          1.30e-04      72.420   57
CPL     -1.173    -0.271      0.289       84.884     -14.925        42.413      6.02e-03     -1.57e-03          2.30e-03      62.380   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      -1.704     -0.203     0.195       -           -               -         2.33e-02     -3.06e-03          3.01e-03      59.150   57
CPL     -1.292     -0.393     0.809       81.593     -35.580       -81.593      3.87e-02     -1.78e-02          6.53e-02      58.130   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   1.06e-06  1.76e-06  2.23e-06  5.61e-06  6.61e-06  1.07e-05   erg/cm2
      90%_error_low -6.86e-08 -6.91e-08 -1.10e-07 -5.78e-07 -2.63e-07 -6.64e-07   erg/cm2
      90%_error_hi   7.01e-08  6.89e-08  1.10e-07  6.21e-07  2.64e-07  6.97e-07   erg/cm2
Peak flux       PL   1.17e+00  1.04e+00  6.38e-01  5.94e-01  3.10e+00  3.44e+00   ph/cm2/s
      90%_error_low -2.06e-01 -1.25e-01 -1.07e-01 -1.73e-01 -3.69e-01 -4.13e-01   ph/cm2/s
      90%_error_hi   2.14e-01  1.25e-01  1.06e-01  2.08e-01  3.70e-01  4.15e-01   ph/cm2/s
 
Fluence        CPL   9.67e-07  1.84e-06  2.29e-06  2.87e-06  6.37e-06  7.96e-06   erg/cm2
      90%_error_low -8.32e-08 -8.12e-08 -1.20e-07 -8.19e-07 -2.95e-07 -8.68e-07   erg/cm2
      90%_error_hi   8.48e-08  8.22e-08  1.21e-07  1.22e-06  2.95e-07  1.23e-06   erg/cm2
Peak flux      CPL   1.10e+00  1.09e+00  6.60e-01  3.68e-01  3.07e+00  3.23e+00   ph/cm2/s
      90%_error_low -2.34e-01 -1.53e-01 -1.16e-01 -2.13e-01 -3.73e-01 -4.41e-01   ph/cm2/s
      90%_error_hi   2.37e-01  1.60e-01  1.19e-01  2.99e-01  3.73e-01  5.25e-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
   54.2902   -32.1761   0.0061    34.7554   114.2280         7.7350336     31.475 TRIG_00938899                 
 
Foreground time interval of the image:
-11.120  29.917 (delta_t =  41.037 [sec])
Background time interval of the image:
-239.384 -11.120 (delta_t = 228.264 [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  -11.120 sec. to  196.104 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66368     ( -0.0672598   0.0668765 )
Norm@50keV  : 3.43635E-03    ( -0.000130208   0.000129961 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.42 using 59 PHA bins.
# Reduced chi-squared =          1.271 for     57 degrees of freedom 
# Null hypothesis probability =   8.186568e-02
 
Photon flux (15-150 keV)    in 207.2 sec: 0.450765 ( -0.017641  0.017681 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.61409e-06 ( -2.62982e-07  2.6371e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -11.120 sec. to  196.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17271     ( -0.271234   0.289014 )
Epeak [keV] : 84.8842      ( -14.9248 42.4131 )
Norm@50keV  : 6.02431E-03    ( -0.00157162   0.00230349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.38 using 59 PHA bins.
# Reduced chi-squared =          1.114 for     56 degrees of freedom 
# Null hypothesis probability =   2.598445e-01
 
Photon flux (15-150 keV)    in 207.2 sec: 0.437483 ( -0.018918  0.018966 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.37221e-06 ( -2.94781e-07  2.94628e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    6.444 sec. to    7.444 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70436     ( -0.203417   0.195068 )
Norm@50keV  : 2.32751E-02    ( -0.00306029   0.00300876 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.15 using 59 PHA bins.
# Reduced chi-squared =          1.038 for     57 degrees of freedom 
# Null hypothesis probability =   3.970243e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.09605 ( -0.36948  0.36963 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.15457e-07 ( -2.9394e-08  2.96976e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    6.444 sec. to    7.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29233     ( -0.393433   0.809307 )
Epeak [keV] : 81.5930      ( -35.5795 -81.593 )
Norm@50keV  : 3.87322E-02    ( -0.017842   0.0652818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.13 using 59 PHA bins.
# Reduced chi-squared =          1.038 for     56 degrees of freedom 
# Null hypothesis probability =   3.968406e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.06803 ( -0.37287  0.37277 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.10271e-07 ( -3.11568e-08  3.11083e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 125.736 sec.
Hardness ratio (energy fluence ratio) = 1.24331149921

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

    S(15-50 keV)  = 2.8059615e-06
S(50-150 keV) = 3.566281e-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 = -2.847396224615103E-01, IMY = -6.327479120229644E-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:
-239.384000 -11.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 43.3130 -23.1435    2.6  39.0   93.2   4.0695   4.4 ------	UNKNOWN                       
116.4039 -50.5795    2.9  51.0 -175.0   2.4044   4.0 ------	UNKNOWN                       
123.4414 -46.2906    4.3  57.3 -173.9   3.2957   2.7 ------	UNKNOWN                       
307.5408 -37.1646    3.4  50.6  -39.4   3.0643   3.4 ------	UNKNOWN                       
213.8334 -77.0938    2.2  43.9 -116.5   4.9721   5.1 ------	UNKNOWN

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

    Time interval of the image:
-11.120000 29.916610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 54.2902 -32.1761    0.4  34.8  114.2   7.7343  31.5 ------	UNKNOWN                       
353.6611 -11.1288    2.6  51.9   24.6   1.8707   4.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
84.116600 651.272100
660.616000 718.173100
720.616000 959.916610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 27.0636   0.9784    2.9  42.0   43.0   5.1010   4.0 ------	UNKNOWN                       
 78.7861  -3.5203    2.7  36.8  129.9   6.2569   4.3 ------	UNKNOWN                       
  0.6880  -6.9261    4.7  55.7   10.9   7.0778   2.5  417.6	UNKNOWN                       
357.5652  -9.4689    3.0  56.9    6.3  13.3751   3.9  586.5	UNKNOWN                       
356.3909 -11.9868    2.9  56.6    3.0  10.6276   4.0 ------	UNKNOWN                       
 15.0288 -26.4397    2.6  34.5   -4.7   3.3867   4.4 ------	UNKNOWN                       
  4.7458 -63.0880    3.1  43.6  -64.0  10.0016   3.7 ------	UNKNOWN