GRB201014A: 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 01:14:53 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1000255
======================================================================

  Trigger: 01000255      Segment: 000

  BAT Trigger Time: 624408544   [s; MET]
      Trigger Stop: 624408608   [s; MET]
               UTC: 2020-10-14T22:48:38.193780    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 20.8466176995543   Dec: 27.6923730288515  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.38
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.38

  Analysis Position:   [ source = BAT ]
    RA: 20.8466176995543   Dec: 27.6923730288515  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 20.8340824780018   Dec: 27.7219777586787  [deg; J2000]  
        { 01h 23m 20.2s , +27d 43' 19.1" }
         +/- 2.50775373547916 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.20217676059562 [arcmin] (formal 1-sigma fit error)
    SNR: 8.17921077613717
 
  Angular difference between the analysis and refined position is 1.896990 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 36.1959998607635 +/- 8.10761416466268
        Measured from: 31.6720000505447
                   to: 67.8679999113083     [s; relative to TRIGTIME]
     T50: 14.2919999361038 +/- 7.68920408764752
        Measured from: 39
                   to: 53.2919999361038     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 59.4400000572205     
                   to: 60.4400000572205     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 30.1640000343323     
                   to: 69.8400000333786     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.382498   0.261239   0.036463   0.025609
           0.042583   0.043640   0.037681   0.032962 [error]
 Peak      0.020656   0.009621   0.006157   0.009307
           0.006916   0.006660   0.005859   0.005260 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   39.676   30.164   69.840
T90    36.196   31.672   67.868
T50    14.292   39.000   53.292
Peak    1.000   59.440   60.440
 
 
====== 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      -2.550    -0.397      0.343       -           -               -         7.64e-04     -2.29e-04          2.34e-04      50.770   57
CPL     -0.697    -1.296      3.613       21.162     -20.193         7.822      1.49e-02     -1.49e-02          7.14e+00      48.560   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      -2.190     -1.774     1.117       -           -               -         1.97e-03     -1.97e-03          1.47e-03      56.320   57
CPL     -1.987      N/A       N/A          25.960      N/A           N/A         2.24e-03        N/A               N/A         56.420   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   1.05e-07  1.02e-07  7.00e-08  7.51e-08  3.07e-07  3.52e-07   erg/cm2
      90%_error_low -1.93e-08 -2.13e-08 -2.64e-08 -4.21e-08 -6.58e-08 -9.04e-08   erg/cm2
      90%_error_hi   1.93e-08  2.05e-08  3.06e-08  7.09e-08  7.08e-08  1.13e-07   erg/cm2
Peak flux       PL   1.58e-01  1.06e-01  4.65e-02  2.81e-02  3.25e-01  3.39e-01   ph/cm2/s
      90%_error_low -1.58e-01 -1.06e-01 -4.10e-02 -2.81e-02 -1.54e-01 -1.65e-01   ph/cm2/s
      90%_error_hi   1.04e-01  5.31e-02  5.38e-02  1.16e-01  1.54e-01  1.71e-01   ph/cm2/s
 
Fluence        CPL   1.05e-07  1.15e-07  3.56e-08  1.96e-09  2.58e-07  2.58e-07   erg/cm2
      90%_error_low -2.06e-08 -2.68e-08 -2.96e-08 -1.95e-09 -5.60e-08 -5.61e-08   erg/cm2
      90%_error_hi   2.07e-08  2.77e-08  4.89e-08  4.87e-08  8.18e-08  1.03e-07   erg/cm2
Peak flux      CPL   1.40e-01  9.47e-02  4.28e-02  3.22e-02  2.96e-01  3.20e-01   ph/cm2/s
      90%_error_low -1.09e-01 -9.47e-02 -4.28e-02 -3.22e-02 -2.96e-01     N/A     ph/cm2/s
      90%_error_hi   1.19e-01  5.66e-02  1.76e-03  3.08e-02  1.61e-01     N/A     ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   20.8341    27.7220   0.0235    14.7395   -14.7838         0.6958510      8.179 TRIG_01000255                 
 
Foreground time interval of the image:
 30.164  69.840 (delta_t =  39.676 [sec])
Background time interval of the image:
-143.699  30.164 (delta_t = 173.863 [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   30.164 sec. to   69.840 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.5496     ( -0.396749   0.342528 )
Norm@50keV  : 7.63774E-04    ( -0.00022885   0.000233972 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.77     using 59 bins.
 Reduced chi-squared = 0.890702
# Null hypothesis probability of 7.06e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 39.68 sec: 0.154740 ( -0.025303  0.02536 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.07356e-07 ( -6.57926e-08  7.07657e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   30.164 sec. to   69.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.696954     ( -1.31087   3.59785 )
Epeak [keV] : 21.1615      ( -20.289 7.72568 )
Norm@50keV  : 1.48962E-02    ( -0.0157064   7.14099 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.56     using 59 bins.
 Reduced chi-squared = 0.867143
# Null hypothesis probability of 7.49e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 39.68 sec: 0.149686 ( -0.0246  0.025095 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.58185e-07 ( -5.59758e-08  8.18479e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   59.440 sec. to   60.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.19005     ( -1.77313   1.11809 )
Norm@50keV  : 1.97185E-03    ( -0.00197067   0.00147387 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.32     using 59 bins.
 Reduced chi-squared = 0.98807
# Null hypothesis probability of 5.00e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.324762 ( -0.154211  0.154048 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.85089e-08 ( -1.13391e-08  1.37783e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   59.440 sec. to   60.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98699     (       )
Epeak [keV] : 25.9604      (   )
Norm@50keV  : 2.24315E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.42     using 59 bins.
 Reduced chi-squared = 1.0075
# Null hypothesis probability of 4.59e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.296347 ( -0.296347  0.161191 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80443e-08 ( -1.6856e-08  1.09051e-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 = 2.543736476525352E-01, IMY = 6.713140143594612E-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:
-143.699400 30.164000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 34.3986  50.8998    2.8  39.4   -0.8   1.1911   4.2 ------	UNKNOWN                       
 30.9102  47.9233    2.5  35.9   -2.8   1.2567   4.5 ------	UNKNOWN                       

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

Time interval of the image:
30.164000 69.840000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 21.1331 -40.1339    1.9  53.1  165.8   2.1541   6.0 ------	UNKNOWN                       
 20.8341  27.7220    1.4  14.7  -14.8   0.6959   8.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
153.500600 864.200600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6405  22.0295    1.1  56.6  -10.5  23.4354  10.0    1.0	Crab                          
326.1782  38.2412    5.8  46.4 -153.4  -2.6695  -2.0    4.8	Cyg X-2                       
 11.3576  -6.4888    3.4  35.4  105.3   4.0270   3.4 ------	UNKNOWN                       
 56.3477   4.9141    3.1  40.7   26.3   3.6720   3.8 ------	UNKNOWN                       
326.2221  18.5741    2.4  50.7 -179.1   7.9622   4.9 ------	UNKNOWN                       
 36.5873  57.7850    3.1  32.1  -75.4   3.5047   3.7 ------	UNKNOWN                       
 84.3766  46.7581    3.6  52.5  -40.6   9.3959   3.2 ------	UNKNOWN                       
319.8768  51.7604    3.2  50.9 -135.4  11.6592   3.6 ------	UNKNOWN                       
 74.3280  56.0888    2.8  47.2  -53.5  11.4071   4.2 ------	UNKNOWN