GRB191123A: Summary Image Light curves Spectra Distribution Others

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 Dec 11 18:41:23 EST 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger939079
======================================================================

  Trigger: 00939079      Segment: 000

  BAT Trigger Time: 596198348.288   [s; MET]
      Trigger Stop: 596198349.312   [s; MET]
               UTC: 2019-11-23T10:38:44.318720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 215.260938956595   Dec: 22.8416115021627  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.27
     Image Trigger?:     NO
     Rate S/N Ratio:     12.1655250605964  [ if not an image trigger ]
     Image S/N Ratio:    7.27

  Analysis Position:   [ source = BAT ]
    RA: 215.260938956595   Dec: 22.8416115021627  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 215.292546007874   Dec: 22.8338454237002  [deg; J2000]  
        { 14h 21m 10.2s , +22d 50' 01.8" }
         +/- 2.15793976109161 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.762786298907505 [arcmin] (formal 1-sigma fit error)
    SNR: 10.1372312903918
 
  Angular difference between the analysis and refined position is 1.808807 arcmin
 
  Partial Coding Fraction: 0.859375    [ including projection effects ]

  Duration
     T90: 284.81199991703 +/- 52.2317749194354
        Measured from: -1.03199994564056
                   to: 283.77999997139     [s; relative to TRIGTIME]
     T50: 147.699999928474 +/- 117.160109295019
        Measured from: 9.21200001239777
                   to: 156.911999940872     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 111.784000039101     
                   to: 112.784000039101     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.04799997806549     
                   to: 335.968000054359     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.610025   0.906088   0.443038   0.139023
           0.107184   0.110748   0.097098   0.087028 [error]
 Peak      0.034228   0.063907   0.048251   0.012634
           0.006425   0.006946   0.006421   0.005466 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  339.016   -3.048  335.968
T90   284.812   -1.032  283.780
T50   147.700    9.212  156.912
Peak    1.000  111.784  112.784
 
 
====== 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      -1.691    -0.264      0.254       -           -               -         3.77e-04     -6.49e-05          6.34e-05      52.610   57
CPL     -0.946    -0.587      1.782       57.876     -15.487       -57.876      1.04e-03     -1.04e-03          1.17e-02      51.480   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      -1.334     -0.213     0.213       -           -               -         1.01e-02     -1.31e-03          1.30e-03      59.830   57
CPL     -0.907     -0.538     1.034      123.409     -61.869      -123.409      1.70e-02     -9.28e-03          4.16e-02      59.130   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   1.95e-07  3.19e-07  3.95e-07  9.69e-07  1.18e-06  1.88e-06   erg/cm2
      90%_error_low -4.15e-08 -4.73e-08 -8.97e-08 -3.78e-07 -2.11e-07 -4.82e-07   erg/cm2
      90%_error_hi   4.28e-08  4.73e-08  9.12e-08  5.17e-07  2.17e-07  5.96e-07   erg/cm2
Peak flux       PL   3.56e-01  3.95e-01  3.14e-01  4.12e-01  1.22e+00  1.48e+00   ph/cm2/s
      90%_error_low -7.44e-02 -5.37e-02 -5.02e-02 -1.20e-01 -1.54e-01 -1.97e-01   ph/cm2/s
      90%_error_hi   7.85e-02  5.32e-02  4.97e-02  1.47e-01  1.54e-01  2.01e-01   ph/cm2/s
 
Fluence        CPL   1.86e-07  3.52e-07  3.78e-07  2.61e-07  1.07e-06  1.18e-06   erg/cm2
      90%_error_low -4.57e-08 -6.83e-08 -1.35e-07 -2.35e-07 -2.60e-07 -3.62e-07   erg/cm2
      90%_error_hi   4.58e-08  7.65e-08  1.05e-07  8.32e-07  2.77e-07  9.15e-07   erg/cm2
Peak flux      CPL   3.34e-01  4.15e-01  3.23e-01  2.41e-01  1.20e+00  1.31e+00   ph/cm2/s
      90%_error_low -8.65e-02 -6.58e-02 -5.44e-02 -1.56e-01 -1.60e-01 -2.31e-01   ph/cm2/s
      90%_error_hi   8.89e-02  6.97e-02  5.62e-02  2.12e-01  1.59e-01  2.81e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  215.2925    22.8338   0.0188    17.5733  -124.5695         0.5719197     10.137 TRIG_00939079                 
 
Foreground time interval of the image:
 -3.048  16.613 (delta_t =  19.661 [sec])
Background time interval of the image:
-239.288  -3.048 (delta_t = 236.240 [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

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   -3.048 sec. to  335.968 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.69125     ( -0.264389   0.254097 )
Norm@50keV  : 3.76634E-04    ( -6.49062e-05   6.34436e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.61 using 59 PHA bins.
# Reduced chi-squared =         0.9230 for     57 degrees of freedom 
# Null hypothesis probability =   6.401895e-01
 
Photon flux (15-150 keV)    in 339 sec: 4.98713E-02 ( -0.0073925  0.0073931 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18315e-06 ( -2.11322e-07  2.17435e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -3.048 sec. to  335.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.945513     ( -0.587802   1.78143 )
Epeak [keV] : 57.8764      ( -15.4495 -57.8386 )
Norm@50keV  : 1.03562E-03    ( -0.00103767   0.0117425 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.48 using 59 PHA bins.
# Reduced chi-squared =         0.9193 for     56 degrees of freedom 
# Null hypothesis probability =   6.464880e-01
 
Photon flux (15-150 keV)    in 339 sec: 4.85230E-02 ( -0.007741  0.0077128 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07189e-06 ( -2.60236e-07  2.77105e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  111.784 sec. to  112.784 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33358     ( -0.213255   0.21284 )
Norm@50keV  : 1.01393E-02    ( -0.0013108   0.001304 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.83 using 59 PHA bins.
# Reduced chi-squared =          1.050 for     57 degrees of freedom 
# Null hypothesis probability =   3.733398e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.21747 ( -0.15439  0.15445 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.941e-08 ( -1.45037e-08  1.47174e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  111.784 sec. to  112.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.907416     ( -0.538347   1.03442 )
Epeak [keV] : 123.409      ( -61.8974 -123.437 )
Norm@50keV  : 1.70026E-02    ( -0.00927934   0.041582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.13 using 59 PHA bins.
# Reduced chi-squared =          1.056 for     56 degrees of freedom 
# Null hypothesis probability =   3.618381e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.19925 ( -0.15966  0.15894 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.54597e-08 ( -1.68873e-08  1.66802e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 284.812 sec.
Hardness ratio (energy fluence ratio) = 1.2386545985

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

S(15-50 keV)  = 5.142685e-07
S(50-150 keV) = 6.689086e-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 = -1.797007330338441E-01, IMY = 2.607881449264923E-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:
-239.288000 -3.048000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3053  35.2201    6.4  50.1 -156.2   1.2463   1.8   10.5	Her X-1                       
241.9393  69.8831    2.9  51.1  157.6   6.0402   4.0 ------	UNKNOWN                       
168.4745  13.8588    2.5  28.7   29.6   1.6743   4.6 ------	UNKNOWN                       
190.4028  -9.7581    2.7  36.2  -31.0   1.5002   4.2 ------	UNKNOWN                       
254.5405  31.2562    2.6  50.8 -151.2   3.2832   4.5 ------	UNKNOWN                       
212.6039 -14.6029    3.0  43.6  -64.1   4.4792   3.9 ------	UNKNOWN                       
249.5459  17.9912    2.2  49.7 -133.0   7.5901   5.2 ------	UNKNOWN                       

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

Time interval of the image:
-3.048000 16.612600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5987  35.5240    0.0  50.3 -156.7   0.1018   0.7   12.9	Her X-1                       
249.2607  69.4930    2.3  53.1  159.6   1.5900   4.9 ------	UNKNOWN                       
166.2955   9.4501    2.4  32.9   24.4   0.3382   4.7 ------	UNKNOWN                       
168.7248 -15.7146    2.6  49.6   -5.1   0.4925   4.4 ------	UNKNOWN                       
215.2926  22.8338    1.1  17.6 -124.6   0.5719  10.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
58.412590 962.853700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6370  35.3769   11.0  36.3 -179.2   1.0793   1.0    9.0	Her X-1                       
267.0744  53.2112    3.9  49.3  158.3  10.7267   3.0 ------	UNKNOWN                       
164.6854  -5.5459    2.7  57.0    6.4  15.9785   4.3 ------	UNKNOWN                       
176.1582 -15.6699    3.6  54.3  -11.7   5.3127   3.2 ------	UNKNOWN                       
218.7775   0.6415    3.3  22.5  -69.4   2.9276   3.5 ------	UNKNOWN                       
205.6240 -25.1515    2.4  48.9  -48.5  14.7432   4.8 ------	UNKNOWN                       
259.1557   0.8365    2.6  48.0 -129.1  15.2985   4.5 ------	UNKNOWN