Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time: Sun Nov 13 12:47:02 EST 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1002158
======================================================================

  Trigger: 01002158      Segment: 000

  BAT Trigger Time: 625453690.048   [s; MET]
      Trigger Stop: 625453691.072   [s; MET]
               UTC: 2020-10-27T01:07:44.172880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 155.974362541719   Dec: -5.51493711208005  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.12
     Image Trigger?:     NO
     Rate S/N Ratio:     15.3948043183407  [ if not an image trigger ]
     Image S/N Ratio:    8.12

  Analysis Position:   [ source = BAT ]
    RA: 155.974362541719   Dec: -5.51493711208005  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 155.962076596275   Dec: -5.50648063427135  [deg; J2000]  
        { 10h 23m 50.9s , -05d 30' 23.3" }
         +/- 1.71170886444467 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.688681664891796 [arcmin] (formal 1-sigma fit error)
    SNR: 14.1139019036755
 
  Angular difference between the analysis and refined position is 0.892094 arcmin
 
  Partial Coding Fraction: 0.4453125    [ including projection effects ]

  Duration
     T90: 11.7360000610352 +/- 2.60716324258251
        Measured from: -3.19200003147125
                   to: 8.5440000295639     [s; relative to TRIGTIME]
     T50: 4.08399999141693 +/- 2.04844516296397
        Measured from: -0.427999973297119
                   to: 3.65600001811981     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.287999987602234     
                   to: 0.712000012397766     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.86800003051758     
                   to: 10.9919999837875     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.355213   0.337043   0.215299   0.033600
           0.037097   0.038567   0.033264   0.028212 [error]
 Peak      0.058585   0.048427   0.064239   0.009932
           0.010007   0.010959   0.009694   0.007396 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   14.860   -3.868   10.992
T90    11.736   -3.192    8.544
T50     4.084   -0.428    3.656
Peak    1.000   -0.288    0.712
 
 
====== 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: 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      -1.881    -0.212      0.202       -           -               -         3.76e-03     -5.39e-04          5.28e-04      52.270   57
CPL     -0.875    -0.880      1.097       46.642     -10.949        40.220      1.44e-02     -1.44e-02          4.89e-02      48.380   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      -1.481     -0.304     0.295       -           -               -         1.15e-02     -2.11e-03          2.09e-03      59.810   57
CPL     -0.953     -0.794     1.519      104.352     -45.771      -104.352      2.09e-02     -1.12e-02          8.37e-02      59.230   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   1.02e-07  1.49e-07  1.62e-07  3.29e-07  5.14e-07  7.42e-07   erg/cm2
      90%_error_low -1.67e-08 -1.76e-08 -3.06e-08 -1.08e-07 -7.20e-08 -1.46e-07   erg/cm2
      90%_error_hi   1.71e-08  1.76e-08  3.11e-08  1.38e-07  7.35e-08  1.68e-07   erg/cm2
Peak flux       PL   4.66e-01  4.75e-01  3.40e-01  3.89e-01  1.43e+00  1.67e+00   ph/cm2/s
      90%_error_low -1.32e-01 -8.93e-02 -7.75e-02 -1.53e-01 -2.56e-01 -3.00e-01   ph/cm2/s
      90%_error_hi   1.42e-01  8.81e-02  7.59e-02  2.00e-01  2.56e-01  3.03e-01   ph/cm2/s
 
Fluence        CPL   9.44e-08  1.69e-07  1.55e-07  7.21e-08  4.68e-07  4.91e-07   erg/cm2
      90%_error_low -1.88e-08 -2.46e-08 -3.94e-08 -5.30e-08 -7.60e-08 -9.42e-08   erg/cm2
      90%_error_hi   1.88e-08  2.55e-08  3.65e-08  1.89e-07  8.18e-08  1.98e-07   erg/cm2
Peak flux      CPL   4.20e-01  4.98e-01  3.61e-01  2.33e-01  1.41e+00  1.51e+00   ph/cm2/s
      90%_error_low -1.72e-01 -1.01e-01 -8.94e-02 -2.33e-01 -2.65e-01 -3.30e-01   ph/cm2/s
      90%_error_hi   1.71e-01  1.08e-01  9.52e-02  2.13e-01  2.63e-01  3.37e-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
  155.9621    -5.5065   0.0137    31.2872   -78.5515         0.9828992     14.114 TRIG_01002158                 
 
Foreground time interval of the image:
 -3.868  10.992 (delta_t =  14.860 [sec])
Background time interval of the image:
-239.048  -3.868 (delta_t = 235.180 [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   -3.868 sec. to   10.992 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.8806     ( -0.212196   0.201474 )
Norm@50keV  : 3.76237E-03    ( -0.000538809   0.000527974 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.27     using 59 bins.
 Reduced chi-squared = 0.917018
# Null hypothesis probability of 6.53e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 14.86 sec: 0.535578 ( -0.063327  0.063341 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.14053e-07 ( -7.20163e-08  7.34748e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -3.868 sec. to   10.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.875125     ( -0.879934   1.09706 )
Epeak [keV] : 46.6420      ( -10.9493 40.2193 )
Norm@50keV  : 1.44019E-02    ( -0.0144015   0.048909 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.38     using 59 bins.
 Reduced chi-squared = 0.863929
# Null hypothesis probability of 7.56e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 14.86 sec: 0.520307 ( -0.064386  0.064556 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.68207e-07 ( -7.59521e-08  8.18003e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.288 sec. to    0.712 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.48055     ( -0.303568   0.294523 )
Norm@50keV  : 1.15405E-02    ( -0.00210845   0.00208531 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.81     using 59 bins.
 Reduced chi-squared = 1.0493
# Null hypothesis probability of 3.74e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.43334 ( -0.25591  0.25621 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09853e-07 ( -2.1811e-08  2.20547e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.288 sec. to    0.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.952932     ( -0.794484   1.51932 )
Epeak [keV] : 104.352      ( -45.7668 -104.348 )
Norm@50keV  : 2.09376E-02    ( -0.0112409   0.0836721 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.23     using 59 bins.
 Reduced chi-squared = 1.05768
# Null hypothesis probability of 3.58e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.40893 ( -0.26533  0.26268 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07387e-07 ( -2.25471e-08  2.27887e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = 1.206214079209319E-01, IMY = 5.956128925511488E-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:
-239.048000 -3.868000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5223 -40.5302    1.9  44.7  -15.3   2.5525   6.3    1.5	Vela X-1                      
102.5523  -4.8577    3.0  24.7   65.9   1.2455   3.9 ------	UNKNOWN

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

    Time interval of the image:
-3.868000 10.992000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4384 -40.7055    4.8  44.9  -15.1   0.1949   2.4    9.9	Vela X-1                      
155.9621  -5.5065    0.8  31.3  -78.6   0.9830  14.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
67.652590 963.102200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5255 -40.5760    2.4  39.5   12.9   4.2714   4.8    1.3	Vela X-1                      
170.5855 -60.5015   11.3  56.1  -20.3  -1.9397  -1.0   10.8	Cen X-3                       
132.9024 -26.3646    2.2  30.3   32.4   4.3082   5.3 ------	UNKNOWN                       
142.5132 -19.5923    3.1  19.2   30.0   1.9739   3.7 ------	UNKNOWN                       
168.9153 -43.6658    2.8  39.8  -26.4   3.1545   4.1 ------	UNKNOWN                       
196.5978 -12.9627    3.3  40.8  -88.2  10.7412   3.5 ------	UNKNOWN                       
199.2663  15.9631    3.2  48.0 -129.0   8.6133   3.6 ------	UNKNOWN                       
197.3998  -6.2002    3.9  41.2  -98.6   6.8873   3.0 ------	UNKNOWN                       
197.4680  -6.6439    4.6  41.3  -97.9   6.1965   2.7 ------	UNKNOWN