GRB201128A: 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 v2.48
    Process Start Time: Sat Jul 30 00:51:15 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1009679
======================================================================

  Trigger: 01009679      Segment: 000

  BAT Trigger Time: 628237704.384   [s; MET]
      Trigger Stop: 628237709.888   [s; MET]
               UTC: 2020-11-28T06:27:58.325240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 223.135530064962   Dec: 26.6780005543733  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.45
     Image Trigger?:     NO
     Rate S/N Ratio:     12.369316876853  [ if not an image trigger ]
     Image S/N Ratio:    7.45

  Analysis Position:   [ source = BAT ]
    RA: 223.135530064962   Dec: 26.6780005543733  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 223.090504544183   Dec: 26.716892145258  [deg; J2000]  
        { 14h 52m 21.7s , +26d 43' 00.8" }
         +/- 2.39995214824111 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.64601318669136 [arcmin] (formal 1-sigma fit error)
    SNR: 8.70907104722002
 
  Angular difference between the analysis and refined position is 3.357127 arcmin
 
  Partial Coding Fraction: 0.921875    [ including projection effects ]

  Duration
     T90: 8.52400004863739 +/- 3.21968018487519
        Measured from: -0.259999990463257
                   to: 8.26400005817413     [s; relative to TRIGTIME]
     T50: 3.70000004768372 +/- 2.1335276609451
        Measured from: 1.12000000476837
                   to: 4.82000005245209     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.20800006389618     
                   to: 5.20800006389618     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.439999938011169     
                   to: 8.73600006103516     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.079761   0.114555   0.080653   0.031473
           0.019945   0.020656   0.018203   0.016198 [error]
 Peak      0.013290   0.021513   0.018173   0.014909
           0.006571   0.006796   0.005819   0.005349 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    9.176   -0.440    8.736
T90     8.524   -0.260    8.264
T50     3.700    1.120    4.820
Peak    1.000    4.208    5.208
 
 
====== 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      -1.362    -0.365      0.373       -           -               -         2.19e-03     -4.36e-04          4.32e-04      49.580   57
CPL     -1.374    -2.482      0.558     9999.360      N/A           N/A         2.19e-03        N/A               N/A         49.590   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      -1.249     -0.627     0.704       -           -               -         3.81e-03     -1.26e-03          1.26e-03      45.190   57
CPL     -1.263     -0.614     1.106     9999.360    -9999.360      -9999.360      3.80e-03     -3.80e-03          1.27e-02      45.190   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   2.26e-08  4.52e-08  7.03e-08  2.41e-07  1.96e-07  3.79e-07   erg/cm2
      90%_error_low -7.77e-09 -9.71e-09 -1.83e-08 -1.13e-07 -4.37e-08 -1.30e-07   erg/cm2
      90%_error_hi   8.39e-09  9.41e-09  1.79e-08  1.72e-07  4.45e-08  1.79e-07   erg/cm2
Peak flux       PL   1.23e-01  1.44e-01  1.21e-01  1.72e-01  4.50e-01  5.61e-01   ph/cm2/s
      90%_error_low -7.44e-02 -6.05e-02 -4.88e-02 -1.11e-01 -1.55e-01 -1.91e-01   ph/cm2/s
      90%_error_hi   8.84e-02  5.54e-02  4.66e-02  2.12e-01  1.56e-01  2.02e-01   ph/cm2/s
 
Fluence        CPL   2.30e-08  4.42e-08  6.92e-08  2.75e-07  1.98e-07  3.72e-07   erg/cm2
      90%_error_low    N/A       N/A       N/A    -2.12e-07 -5.69e-08 -1.76e-07   erg/cm2
      90%_error_hi     N/A       N/A       N/A     4.10e-08  5.49e-08  1.14e-07   erg/cm2
Peak flux      CPL   1.24e-01  1.44e-01  1.21e-01  1.71e-01  4.52e-01  5.66e-01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A   -1.57e-01 -2.28e-01   ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A    1.55e-01  1.96e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  223.0905    26.7169   0.0221    24.8439  -171.8619         0.3492565      8.709 TRIG_01009679                 
 
Foreground time interval of the image:
 -0.440   8.736 (delta_t =   9.176 [sec])
Background time interval of the image:
-239.384  -0.440 (delta_t = 238.944 [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   -0.440 sec. to    8.736 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36219     ( -0.365421   0.372877 )
Norm@50keV  : 2.19402E-03    ( -0.000435703   0.000432124 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.58     using 59 bins.
 Reduced chi-squared = 0.869825
# Null hypothesis probability of 7.47e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 9.176 sec: 0.264990 ( -0.052567  0.052732 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.96125e-07 ( -4.3687e-08  4.45069e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.440 sec. to    8.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.61222     ( -1.24416   1.79551 )
Epeak [keV] : 193.925      (   )
Norm@50keV  : 4.52697E-04    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.61     using 59 bins.
 Reduced chi-squared = 0.868036
# Null hypothesis probability of 7.48e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 9.176 sec: 0.264986 ( -0.05266  0.052679 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.97767e-07 ( -5.68691e-08  5.48973e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    4.208 sec. to    5.208 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.24895     ( -0.627083   0.703693 )
Norm@50keV  : 3.80841E-03    ( -0.00126052   0.00126038 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   45.19     using 59 bins.
 Reduced chi-squared = 0.792807
# Null hypothesis probability of 8.71e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.450357 ( -0.154871  0.155536 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.81294e-08 ( -1.39085e-08  1.42536e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.208 sec. to    5.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.17547     ( -0.615329   1.10426 )
Epeak [keV] : 62.6657      ( -9999.36 -9999.36 )
Norm@50keV  : 1.04367E-03    ( -0.00103916   0.0154383 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.93     using 59 bins.
 Reduced chi-squared = 0.802321
# Null hypothesis probability of 8.56e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.451860 ( -0.157227  0.154811 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.86322e-08 ( -1.44971e-08  1.38111e-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 = -4.583320075648246E-01, IMY = 6.554112632781912E-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:
-239.384000 -0.440000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3969  35.4237    7.8  52.7 -166.8   1.2139   1.5    5.7	Her X-1                       
237.9082  16.4702    2.2  34.8 -143.2   1.9068   5.3 ------	UNKNOWN                       
244.6102  -1.4901    3.5  43.9 -116.3   3.8862   3.3 ------	UNKNOWN                       

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

Time interval of the image:
-0.440000 8.736000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4786  35.3600    5.2  52.8 -166.7   0.2497   2.2    1.5	Her X-1                       
223.0906  26.7168    1.3  24.8 -171.9   0.3491   8.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
110.516600 772.716600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4617  35.3839    1.5  28.1  179.9   4.5749   7.6    2.5	Her X-1                       
169.7717  28.2831    3.4  47.0   40.6   5.3922   3.4 ------	UNKNOWN                       
284.7675  30.1457    2.4  53.7 -173.5   8.3215   4.8 ------	UNKNOWN                       
258.6299  15.7051    3.4  34.7 -143.2   2.4669   3.4 ------	UNKNOWN                       
282.0323  17.8586    2.9  54.8 -158.1   7.9210   4.0 ------	UNKNOWN                       
205.7489 -20.5093    2.7  50.1  -42.9   9.9726   4.3 ------	UNKNOWN                       
214.5962 -19.5393    3.2  46.9  -53.3   7.9843   3.6 ------	UNKNOWN