GRB191024A

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Nov 27 12:07:52 EST 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger931242
======================================================================

  Trigger: 00931242      Segment: 000

  BAT Trigger Time: 593584996.416   [s; MET]
      Trigger Stop: 593584996.928   [s; MET]
               UTC: 2019-10-24T04:42:52.615160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 10.1472153743508   Dec: -67.1394119919046  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.68
     Image Trigger?:     NO
     Rate S/N Ratio:     16.1864140562386  [ if not an image trigger ]
     Image S/N Ratio:    8.68

  Analysis Position:   [ source = BAT ]
    RA: 10.1472153743508   Dec: -67.1394119919046  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 10.1288771567599   Dec: -67.1380774306605  [deg; J2000]  
        { 00h 40m 30.9s , -67d 08' 17.1" }
         +/- 1.30748728829961 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.526008859915265 [arcmin] (formal 1-sigma fit error)
    SNR: 20.7385854114519
 
  Angular difference between the analysis and refined position is 0.434900 arcmin
 
  Partial Coding Fraction: 0.90625    [ including projection effects ]

  Duration
     T90: 7.08399987220764 +/- 0.978243413242523
        Measured from: -0.583999991416931
                   to: 6.49999988079071     [s; relative to TRIGTIME]
     T50: 3.31199991703033 +/- 0.539332884380847
        Measured from: 0.312000036239624
                   to: 3.62399995326996     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.307999968528748     
                   to: 0.692000031471252     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.955999970436096     
                   to: 7.44799995422363     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.269218   0.327025   0.173110   0.066431
           0.020437   0.021231   0.018392   0.015606 [error]
 Peak      0.065024   0.076365   0.044218   0.016928
           0.007316   0.007806   0.006959   0.005564 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    8.404   -0.956    7.448
T90     7.084   -0.584    6.500
T50     3.312    0.312    3.624
Peak    1.000   -0.308    0.692
 
 
====== 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      -1.783    -0.139      0.136       -           -               -         6.05e-03     -5.23e-04          5.16e-04      72.930   57
CPL     -1.431    -0.486      0.659       70.837     -22.164       -70.837      9.52e-03     -3.87e-03          1.27e-02      71.820   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      -1.782     -0.209     0.201       -           -               -         1.18e-02     -1.61e-03          1.58e-03      62.470   57
CPL     -1.371     -0.797     1.162       63.828     -24.205       -63.828      2.05e-02     -6.55e-03          7.96e-02      61.900   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   8.47e-08  1.31e-07  1.52e-07  3.41e-07  4.68e-07  7.09e-07   erg/cm2
      90%_error_low -9.75e-09 -9.93e-09 -1.78e-08 -7.47e-08 -4.13e-08 -9.33e-08   erg/cm2
      90%_error_hi   9.99e-09  9.93e-09  1.79e-08  8.80e-08  4.18e-08  1.04e-07   erg/cm2
Peak flux       PL   6.36e-01  5.42e-01  3.15e-01  2.74e-01  1.61e+00  1.77e+00   ph/cm2/s
      90%_error_low -1.06e-01 -6.22e-02 -5.58e-02 -8.35e-02 -1.85e-01 -2.08e-01   ph/cm2/s
      90%_error_hi   1.09e-01  6.22e-02  5.61e-02  1.03e-01  1.85e-01  2.09e-01   ph/cm2/s
 
Fluence        CPL   8.17e-08  1.37e-07  1.52e-07  1.82e-07  4.51e-07  5.52e-07   erg/cm2
      90%_error_low -1.10e-08 -1.34e-08 -1.95e-08 -1.11e-07 -5.01e-08 -1.23e-07   erg/cm2
      90%_error_hi   1.10e-08  1.39e-08  1.89e-08  1.84e-07  5.01e-08  1.97e-07   erg/cm2
Peak flux      CPL   6.15e-01  5.71e-01  3.14e-01  1.49e-01  1.59e+00  1.65e+00   ph/cm2/s
      90%_error_low -1.18e-01 -8.13e-02 -6.63e-02 -1.49e-01 -1.93e-01 -2.33e-01   ph/cm2/s
      90%_error_hi   1.18e-01  9.50e-02  6.02e-02  1.52e-01  1.91e-01  2.73e-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
   10.1289   -67.1381   0.0092    25.5929  -171.7499         0.8181860     20.739 TRIG_00931242                 
 
Foreground time interval of the image:
 -0.956   7.448 (delta_t =   8.404 [sec])
Background time interval of the image:
-239.416  -0.956 (delta_t = 238.460 [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:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from   -0.956 sec. to    7.448 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.78303     ( -0.13936   0.136265 )
Norm@50keV  : 6.04657E-03    ( -0.000523054   0.000516326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.93 using 59 PHA bins.
# Reduced chi-squared =          1.280 for     57 degrees of freedom 
# Null hypothesis probability =   7.586639e-02
 
Photon flux (15-150 keV)    in 8.404 sec: 0.827828 ( -0.063323  0.06336 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.68194e-07 ( -4.12945e-08  4.18125e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.956 sec. to    7.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43096     ( -0.485585   0.658973 )
Epeak [keV] : 70.8366      ( -22.1638 -70.8365 )
Norm@50keV  : 9.52351E-03    ( -0.00387189   0.0126831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.82 using 59 PHA bins.
# Reduced chi-squared =          1.282 for     56 degrees of freedom 
# Null hypothesis probability =   7.564142e-02
 
Photon flux (15-150 keV)    in 8.404 sec: 0.815628 ( -0.066549  0.066296 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.50554e-07 ( -5.01057e-08  5.011e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.308 sec. to    0.692 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.78161     ( -0.209344   0.200549 )
Norm@50keV  : 1.17766E-02    ( -0.00161265   0.0015778 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.47 using 59 PHA bins.
# Reduced chi-squared =          1.096 for     57 degrees of freedom 
# Null hypothesis probability =   2.880302e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.61145 ( -0.18495  0.18497 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.08513e-07 ( -1.50478e-08  1.53495e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.308 sec. to    0.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3706     ( -0.796918   1.1621 )
Epeak [keV] : 63.8284      ( -24.1816 -63.8054 )
Norm@50keV  : 2.04775E-02    ( -0.00655744   0.0796079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.90 using 59 PHA bins.
# Reduced chi-squared =          1.105 for     56 degrees of freedom 
# Null hypothesis probability =   2.736855e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.58961 ( -0.19281  0.1914 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) 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 = -4.740104481419378E-01, IMY = 6.872941176620725E-02

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:
-239.416000 -0.956000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
275.7849 -30.2963    9.9  47.9  -50.6   1.3562   1.2    8.4	H1820-303                     
284.8904 -25.1013    0.0  45.4  -37.8  -0.4890  -0.9   13.4	HT1900.1-2455                 
330.6795  -0.3090    3.6  48.5   33.7   2.6093   3.2 ------	UNKNOWN                       
319.6301   4.2292    2.7  54.6   20.6   5.5817   4.3 ------	UNKNOWN                       
 72.5216 -52.9027    2.8  56.8  173.9   5.4708   4.1 ------	UNKNOWN

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

Time interval of the image:
-0.956000 7.448000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
275.7525 -30.5197    4.0  47.7  -50.8   0.4709   2.9   12.8	H1820-303                     
285.1707 -24.9634    3.0  45.3  -37.4  -0.3201  -3.8    7.8	HT1900.1-2455                 
 10.1290 -67.1381    0.6  25.6 -171.7   0.8180  20.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
813.284600 962.645100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']

Analysis Summary

Notes:

Image

Pre-slew 15.0-350.0 keV image (Event data)

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve