GRB201026A: 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 01:03:18 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1002103
======================================================================

  Trigger: 01002103      Segment: 000

  BAT Trigger Time: 625444680.064   [s; MET]
      Trigger Stop: 625444681.088   [s; MET]
               UTC: 2020-10-26T22:37:34.189480    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 196.664384320839   Dec: 83.7606316325239  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.67
     Image Trigger?:     NO
     Rate S/N Ratio:     12.0415945787923  [ if not an image trigger ]
     Image S/N Ratio:    6.67

  Analysis Position:   [ source = BAT ]
    RA: 196.664384320839   Dec: 83.7606316325239  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 196.664107907484   Dec: 83.7846921612754  [deg; J2000]  
        { 13h 06m 39.4s , +83d 47' 04.9" }
         +/- 0.999246034010519 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.374192331069698 [arcmin] (formal 1-sigma fit error)
    SNR: 30.4499323787849
 
  Angular difference between the analysis and refined position is 1.443633 arcmin
 
  Partial Coding Fraction: 0.46875    [ including projection effects ]

  Duration
     T90: 271.783999919891 +/- 10.6831070202307
        Measured from: -40.6640000343323
                   to: 231.119999885559     [s; relative to TRIGTIME]
     T50: 199.251999974251 +/- 6.20614926936312
        Measured from: -1.33200001716614
                   to: 197.919999957085     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.05200004577637     
                   to: 2.05200004577637     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -54     
                   to: 250.103999972343     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.821668   4.587583   2.450368   0.519091
           0.127649   0.133484   0.118151   0.108873 [error]
 Peak      0.069258   0.098776   0.075916   0.015658
           0.011157   0.011831   0.010375   0.008835 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  304.104  -54.000  250.104
T90   271.784  -40.664  231.120
T50   199.252   -1.332  197.920
Peak    1.000    1.052    2.052
 
 
====== 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      -1.900    -0.075      0.074       -           -               -         2.28e-03     -9.82e-05          9.76e-05      67.850   57
CPL     -1.389    -0.315      0.342       54.523      -7.885        18.266      4.28e-03     -1.35e-03          2.21e-03      59.810   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      -1.439     -0.218     0.216       -           -               -         1.78e-02     -2.32e-03          2.31e-03      61.340   57
CPL     -0.947     -0.658     1.024      113.315     -46.037      -113.315      3.09e-02     -1.49e-02          6.23e-02      60.380   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   1.29e-06  1.85e-06  1.99e-06  3.96e-06  6.35e-06  9.09e-06   erg/cm2
      90%_error_low -8.18e-08 -7.21e-08 -1.18e-07 -4.73e-07 -2.70e-07 -5.79e-07   erg/cm2
      90%_error_hi   8.34e-08  7.21e-08  1.18e-07  5.15e-07  2.71e-07  6.11e-07   erg/cm2
Peak flux       PL   6.92e-01  7.22e-01  5.32e-01  6.33e-01  2.19e+00  2.58e+00   ph/cm2/s
      90%_error_low -1.51e-01 -1.03e-01 -8.41e-02 -1.83e-01 -2.89e-01 -3.35e-01   ph/cm2/s
      90%_error_hi   1.61e-01  1.01e-01  8.29e-02  2.21e-01  2.90e-01  3.37e-01   ph/cm2/s
 
Fluence        CPL   1.19e-06  1.94e-06  1.98e-06  1.80e-06  6.03e-06  6.91e-06   erg/cm2
      90%_error_low -9.81e-08 -9.00e-08 -1.28e-07 -6.39e-07 -3.28e-07 -7.30e-07   erg/cm2
      90%_error_hi   9.94e-08  9.13e-08  1.27e-07  1.06e-06  3.30e-07  1.10e-06   erg/cm2
Peak flux      CPL   6.26e-01  7.53e-01  5.62e-01  3.90e-01  2.15e+00  2.33e+00   ph/cm2/s
      90%_error_low -1.87e-01 -1.16e-01 -9.82e-02 -2.18e-01 -2.99e-01 -3.90e-01   ph/cm2/s
      90%_error_hi   1.95e-01  1.21e-01  1.02e-01  3.16e-01  2.98e-01  4.59e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  196.6641    83.7847   0.0063    34.2608    21.8808         5.5991735     30.450 TRIG_01002103                 
 
Foreground time interval of the image:
-54.000  13.637 (delta_t =  67.637 [sec])
Background time interval of the image:
-239.064 -54.000 (delta_t = 185.064 [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

Multiple GTIs in the spectrum
tstart tstop
-54.000000 235.376500
236.936000 250.104000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.89968     ( -0.0752047   0.0742968 )
Norm@50keV  : 2.28399E-03    ( -9.82358e-05   9.76494e-05 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.85     using 59 bins.
 Reduced chi-squared = 1.19035
# Null hypothesis probability of 1.54e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 302.5 sec: 0.327753 ( -0.013218  0.013246 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.35295e-06 ( -2.69848e-07  2.71276e-07 ) ergs/cm2
 

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
-54.000000 235.376500
236.936000 250.104000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38891     ( -0.314871   0.342353 )
Epeak [keV] : 54.5230      ( -7.88473 18.2664 )
Norm@50keV  : 4.27759E-03    ( -0.00134688   0.00220658 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.81     using 59 bins.
 Reduced chi-squared = 1.06804
# Null hypothesis probability of 3.39e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 302.5 sec: 0.317070 ( -0.014627  0.014646 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.03013e-06 ( -3.28412e-07  3.29994e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.052 sec. to    2.052 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43888     ( -0.217797   0.215909 )
Norm@50keV  : 1.78182E-02    ( -0.00231504   0.00230814 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.34     using 59 bins.
 Reduced chi-squared = 1.07614
# Null hypothesis probability of 3.23e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.18990 ( -0.28947  0.29008 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.7088e-07 ( -2.40956e-08  2.42617e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.052 sec. to    2.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.94673     ( -0.657812   1.0244 )
Epeak [keV] : 113.315      ( -46.0375 -113.315 )
Norm@50keV  : 3.08946E-02    ( -0.0148833   0.0623197 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.38     using 59 bins.
 Reduced chi-squared = 1.07821
# Null hypothesis probability of 3.20e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.15085 ( -0.29909  0.29797 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66948e-07 ( -2.53393e-08  2.5308e-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 = 6.320832793948350E-01, IMY = -2.538499748894549E-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:
-239.064000 -54.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4218  35.2517    4.0  19.4 -126.5   0.6645   2.9    5.7	Her X-1                       
268.2360  -1.4273    4.9  55.3 -154.4  -2.2842  -2.3    8.1	SW J1753.5-0127               
288.9372  10.8325    0.0  47.6  176.4   1.3529   2.5   10.6	GRS 1915+105                  
299.6853  35.1878    4.0  31.5  142.9   1.0040   2.9    4.7	Cyg X-1                       
307.8993  40.8095    0.0  32.4  126.8   0.6885   1.6   12.9	Cyg X-3                       
316.5334  28.6968    2.1  45.9  132.9   5.9338   5.5 ------	UNKNOWN                       
248.0970  38.5029    2.8  18.3 -108.0   0.9426   4.1 ------	UNKNOWN                       
160.6231  51.8950    3.4  56.3  -14.4   2.5493   3.4 ------	UNKNOWN                       

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

Time interval of the image:
-54.000000 13.636600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4659  35.3871  320.0  19.2 -126.4  -0.0048  -0.0    2.7	Her X-1                       
268.2336  -1.4201    3.3  55.2 -154.4   1.7584   3.5    8.3	SW J1753.5-0127               
288.6817  10.9774    9.2  47.3  176.7   0.3462   1.3    7.1	GRS 1915+105                  
299.7482  35.3558    5.2  31.4  142.6  -0.4246  -2.2   12.1	Cyg X-1                       
308.0204  40.8139  127.4  32.5  126.7   0.0210   0.1    9.3	Cyg X-3                       
278.9207  74.8034    2.4  22.1   43.1   0.6513   4.7 ------	UNKNOWN                       
196.6641  83.7847    0.4  34.3   21.9   5.5982  30.4 ------	UNKNOWN                       
152.5619  64.1538    2.2  50.6    0.1   1.7364   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
67.836600 235.376500
236.936000 903.936590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4268  35.3287    5.3  51.5 -136.9   7.6595   2.2    1.7	Her X-1                       
299.6878  35.2449  162.2  56.4  177.8   0.2713   0.1    5.4	Cyg X-1                       
308.2474  40.9846    3.3  51.6  168.6   9.7937   3.5    6.5	Cyg X-3                       
 86.0986  45.7313    2.7  46.8   41.2  11.9375   4.3 ------	UNKNOWN                       
 15.5310  61.1888    3.4  35.1  105.9   5.4365   3.4 ------	UNKNOWN                       
196.5827  83.8095    1.5   0.1  102.8   5.3079   7.7 ------	UNKNOWN                       
134.3720  35.7257    2.6  51.6   -8.5   7.1326   4.5 ------	UNKNOWN                       
155.0007  60.7569    3.5  24.9  -24.5   2.4165   3.3 ------	UNKNOWN                       
139.4381  30.5444    3.8  56.2  -14.4   7.6963   3.1 ------	UNKNOWN                       
217.6987  42.9633    3.9  41.2  -98.5   9.2941   3.0 ------	UNKNOWN