GRB200713A: 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: Mon Nov 16 14:49:29 EST 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger982201
======================================================================

  Trigger: 00982201      Segment: 000

  BAT Trigger Time: 616333400   [s; MET]
      Trigger Stop: 616333464   [s; MET]
               UTC: 2020-07-13T11:42:54.723580    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 76.9619372814151   Dec: -32.8252812192549  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.86
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.86

  Analysis Position:   [ source = BAT ]
    RA: 76.9619372814151   Dec: -32.8252812192549  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 76.9329050179147   Dec: -32.841228625877  [deg; J2000]  
        { 05h 07m 43.9s , -32d 50' 28.4" }
         +/- 2.74733342335603 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.59812657370425 [arcmin] (formal 1-sigma fit error)
    SNR: 7.17963122286438
 
  Angular difference between the analysis and refined position is 1.748676 arcmin
 
  Partial Coding Fraction: 0.4648438    [ including projection effects ]

  Duration
     T90: 41.972000002861 +/- 7.98674435078993
        Measured from: 21.1399999856949
                   to: 63.1119999885559     [s; relative to TRIGTIME]
     T50: 20.7480000257492 +/- 9.16834908057172
        Measured from: 32.2519999742508
                   to: 53     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 49.9359999895096     
                   to: 50.9359999895096     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 18.4479999542236     
                   to: 65.9800000190735     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.619338   0.661064   0.211871   0.019283
           0.079062   0.082224   0.074164   0.074768 [error]
 Peak      0.030504   0.027028   0.026173   0.018690
           0.011932   0.011876   0.010932   0.011007 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   47.532   18.448   65.980
T90    41.972   21.140   63.112
T50    20.748   32.252   53.000
Peak    1.000   49.936   50.936
 
 
====== 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      -2.475    -0.340      0.299       -           -               -         1.71e-03     -4.13e-04          4.08e-04      42.810   57
CPL     -1.251    -0.746      2.255       21.530     -18.929        11.323      1.03e-02     -1.03e-02          3.15e-01      40.950   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      -1.628     -0.939     0.813       -           -               -         5.98e-03     -2.76e-03          2.44e-03      44.710   57
CPL     -1.659     -3.092     1.815     9999.360      N/A           N/A         5.89e-03        N/A               N/A         44.720   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   2.62e-07  2.67e-07  1.92e-07  2.21e-07  8.08e-07  9.43e-07   erg/cm2
      90%_error_low -4.64e-08 -4.43e-08 -6.02e-08 -1.09e-07 -1.43e-07 -2.06e-07   erg/cm2
      90%_error_hi   4.73e-08  4.31e-08  6.59e-08  1.65e-07  1.50e-07  2.47e-07   erg/cm2
Peak flux       PL   2.78e-01  2.60e-01  1.68e-01  1.68e-01  7.75e-01  8.73e-01   ph/cm2/s
      90%_error_low -1.75e-01 -1.13e-01 -1.68e-01 -1.68e-01 -3.11e-01 -3.42e-01   ph/cm2/s
      90%_error_hi   2.16e-01  1.06e-01  8.95e-02  2.85e-01  3.12e-01  3.45e-01   ph/cm2/s
 
Fluence        CPL   2.49e-07  3.00e-07  1.52e-07  2.76e-08  7.25e-07  7.29e-07   erg/cm2
      90%_error_low -5.16e-08 -5.73e-08 -8.58e-08 -2.65e-08 -1.42e-07 -1.46e-07   erg/cm2
      90%_error_hi   5.09e-08  6.24e-08  8.68e-08  2.21e-07  1.74e-07  2.58e-07   erg/cm2
Peak flux      CPL   2.55e-01  1.91e-01  9.98e-02  8.83e-02  5.82e-01  6.34e-01   ph/cm2/s
      90%_error_low -2.55e-01 -1.91e-01 -9.98e-02 -8.83e-02 -5.82e-01 -6.34e-01   ph/cm2/s
      90%_error_hi   2.36e-01  1.61e-01  7.96e-02  6.28e-02  4.82e-01  5.14e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   76.9329   -32.8412   0.0268    43.6700  -174.1642         1.7990393      7.180 TRIG_00982201                 
 
Foreground time interval of the image:
 18.448  65.980 (delta_t =  47.532 [sec])
Background time interval of the image:
-11.699  18.448 (delta_t =  30.147 [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   18.448 sec. to   65.980 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.47473     ( -0.340055   0.298945 )
Norm@50keV  : 1.71061E-03    ( -0.00041329   0.000407989 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   42.81     using 59 bins.
 Reduced chi-squared = 0.751053
# Null hypothesis probability of 9.19e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 47.53 sec: 0.330961 ( -0.047237  0.047228 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.07806e-07 ( -1.4324e-07  1.49913e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   18.448 sec. to   65.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25114     ( -0.745727   2.25513 )
Epeak [keV] : 21.5296      ( -18.9323 11.3201 )
Norm@50keV  : 1.02970E-02    ( -0.0103021   0.315025 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.95     using 59 bins.
 Reduced chi-squared = 0.73125
# Null hypothesis probability of 9.34e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 47.53 sec: 0.319775 ( -0.048422  0.048897 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.24647e-07 ( -1.41635e-07  1.74453e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   49.936 sec. to   50.936 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62775     ( -0.938474   0.813346 )
Norm@50keV  : 5.97708E-03    ( -0.00276015   0.00244191 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.71     using 59 bins.
 Reduced chi-squared = 0.784386
# Null hypothesis probability of 8.81e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.774879 ( -0.311265  0.312291 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.57237e-08 ( -2.48989e-08  2.5492e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   49.936 sec. to   50.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -4.1801     ( -0.610028   4.29731 )
Epeak [keV] : 498.736      (   )
Norm@50keV  : 3.97153E-04    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.14     using 59 bins.
 Reduced chi-squared = 0.788214
# Null hypothesis probability of 8.74e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.582443 ( -0.582443  0.482077 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.30491e-08 ( -3.25261e-08  2.18637e-07 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 41.972 sec.
Hardness ratio (energy fluence ratio) = 0.719664422074

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

S(15-50 keV)  = 5.289962e-07
S(50-150 keV) = 2.7883007e-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 = -9.496713393525639E-01, IMY = 9.706305275166674E-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:
-11.699400 18.448000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4196 -40.7497    0.0   6.8   73.3  -0.0744  -1.0   12.7	Vela X-1                      
170.0314 -60.5670 1572.0  35.8   76.1   0.0012   0.0    9.0	Cen X-3                       
 83.4410 -64.4687    2.8  40.3  137.6   0.7672   4.1 ------	UNKNOWN                       
188.0014 -13.9100    2.6  55.9   11.5   2.1154   4.5 ------	UNKNOWN                       

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

Time interval of the image:
18.448000 65.980000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6110 -40.3677    5.2   6.6   70.3  -0.3160  -2.2   11.8	Vela X-1                      
170.5543 -60.7146    5.6  36.1   76.1   0.7400   2.1    8.9	Cen X-3                       
116.2347 -55.2351    2.1  22.2  130.0   0.8942   5.4 ------	UNKNOWN                       
 77.8598 -45.6201    2.2  40.4  167.3   1.2084   5.2 ------	UNKNOWN                       
 76.9329 -32.8412    1.6  43.7 -174.2   1.7992   7.2 ------	UNKNOWN                       
 87.2181  -5.1812    2.2  49.7 -134.3   3.7215   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
138.900600 496.300600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6075 -40.5298    8.1  46.8  -10.3   1.0544   1.4    3.9	Vela X-1                      
 38.0071   8.6343    2.6  55.6 -176.2   7.2447   4.4 ------	UNKNOWN                       
 79.5099  12.8391    2.4  45.8 -123.9   7.5571   4.7 ------	UNKNOWN