GRB200806A: 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: Wed Sep  9 22:53:25 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger987016
======================================================================

  Trigger: 00987016      Segment: 000

  BAT Trigger Time: 618420555.328   [s; MET]
      Trigger Stop: 618420555.84   [s; MET]
               UTC: 2020-08-06T15:28:49.915180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 52.9051939418572   Dec: 37.0819682887688  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.05
     Image Trigger?:     NO
     Rate S/N Ratio:     24.576411454889  [ if not an image trigger ]
     Image S/N Ratio:    11.05

  Analysis Position:   [ source = BAT ]
    RA: 52.9051939418572   Dec: 37.0819682887688  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 52.9343733120723   Dec: 37.0784233951319  [deg; J2000]  
        { 03h 31m 44.2s , +37d 04' 42.3" }
         +/- 0.753807135199884 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.246312963908794 [arcmin] (formal 1-sigma fit error)
    SNR: 45.5471165804709
 
  Angular difference between the analysis and refined position is 1.412846 arcmin
 
  Partial Coding Fraction: 0.5703125    [ including projection effects ]

  Duration
     T90: 38.6879999637604 +/- 1.00406367133862
        Measured from: 3.36400008201599
                   to: 42.0520000457764     [s; relative to TRIGTIME]
     T50: 14.5559998750687 +/- 0.331445312419436
        Measured from: 18.5680000782013
                   to: 33.12399995327     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 22.2440000772476     
                   to: 23.2440000772476     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.131999969482422     
                   to: 61.308000087738     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.397456   7.976800   8.044564   2.269070
           0.060592   0.070291   0.068451   0.052215 [error]
 Peak      0.243909   0.531837   0.720572   0.296189
           0.011351   0.015143   0.017294   0.012728 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   61.440   -0.132   61.308
T90    38.688    3.364   42.052
T50    14.556   18.568   33.124
Peak    1.000   22.244   23.244
 
 
====== 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: CPL)
 
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      -1.209    -0.025      0.025       -           -               -         2.64e-02     -3.94e-04          3.94e-04      89.250   57
CPL     -0.749    -0.112      0.114      173.320     -21.790        34.328      4.02e-02     -3.79e-03          4.27e-03      36.810   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      -0.756     -0.050     0.051       -           -               -         1.23e-01     -3.75e-03          3.74e-03      49.500   57
CPL     -0.469     -0.202     0.212      339.457    -116.109       595.312      1.60e-01     -2.69e-02          3.36e-02      43.560   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   1.58e-06  3.47e-06  6.01e-06  2.41e-05  1.64e-05  3.52e-05   erg/cm2
      90%_error_low -5.03e-08 -6.68e-08 -8.72e-08 -7.99e-07 -2.30e-07 -8.22e-07   erg/cm2
      90%_error_hi   5.10e-08  6.68e-08  8.72e-08  8.17e-07  2.30e-07  8.35e-07   erg/cm2
Peak flux       PL   1.13e-03  1.39e-02  1.36e-02  1.47e+01  4.09e-01  1.47e+01   ph/cm2/s
      90%_error_low 3.79e-05 5.85e-04     N/A   -4.26e-01     N/A   -2.87e-01   ph/cm2/s
      90%_error_hi   1.58e-04  1.91e-03     N/A    5.77e-01     N/A    8.44e-01   ph/cm2/s
 
Fluence        CPL   1.36e-06  3.49e-06  6.35e-06  1.54e-05  1.63e-05  2.66e-05   erg/cm2
      90%_error_low -6.81e-08 -7.00e-08 -1.19e-07 -1.47e-06 -2.36e-07 -1.46e-06   erg/cm2
      90%_error_hi   6.95e-08  6.99e-08  1.19e-07  1.67e-06  2.36e-07  1.65e-06   erg/cm2
Peak flux      CPL   2.27e+00  3.94e+00  4.82e+00  8.29e+00  1.40e+01  1.93e+01   ph/cm2/s
      90%_error_low -2.13e-01 -1.63e-01 -1.87e-01 -1.31e+00 -4.25e-01 -1.37e+00   ph/cm2/s
      90%_error_hi   2.19e-01  1.62e-01  1.88e-01  1.62e+00  4.25e-01  1.65e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   52.9344    37.0784   0.0042    38.5153   -24.7701         2.7592286     45.547 TRIG_00987016                 
 
Foreground time interval of the image:
 -0.132   9.973 (delta_t =  10.105 [sec])
Background time interval of the image:
-239.328  -0.132 (delta_t = 239.196 [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   -0.132 sec. to   61.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.20924     ( -0.0252002   0.0252933 )
Norm@50keV  : 2.64435E-02    ( -0.00039428   0.00039364 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   89.25     using 59 bins.
 Reduced chi-squared = 1.56579
# Null hypothesis probability of 4.06e-03 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 61.44 sec: 3.10804 ( -0.05144  0.05155 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.64423e-05 ( -2.30093e-07  2.30253e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.132 sec. to   61.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.748813     ( -0.111717   0.114273 )
Epeak [keV] : 173.320      ( -21.7893 34.3288 )
Norm@50keV  : 4.01955E-02    ( -0.00379233   0.00426817 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   36.81     using 59 bins.
 Reduced chi-squared = 0.657321
# Null hypothesis probability of 9.78e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 61.44 sec: 3.01090 ( -0.055  0.05528 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.62578e-05 ( -2.35965e-07  2.35677e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   22.244 sec. to   23.244 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.755694     ( -0.0503831   0.0508801 )
Norm@50keV  : 0.122785    ( -0.00375056   0.00373701 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.50     using 59 bins.
 Reduced chi-squared = 0.868421
# Null hypothesis probability of 7.49e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.409140 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.46241e-06 ( -4.45609e-08  4.46134e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   22.244 sec. to   23.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.46936     ( -0.202146   0.212216 )
Epeak [keV] : 339.457      ( -116.109 595.312 )
Norm@50keV  : 0.160214    ( -0.0268736   0.0336098 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   43.56     using 59 bins.
 Reduced chi-squared = 0.777857
# Null hypothesis probability of 8.87e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 14.0274 ( -0.4247  0.4251 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.4566e-06 ( -4.53304e-08  4.52619e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 38.688 sec.
Hardness ratio (energy fluence ratio) = 1.81852799689

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

S(15-50 keV)  = 4.849851e-06
S(50-150 keV) = 1.140771e-05

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 = 7.226485954659663E-01, IMY = 3.334527808191839E-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:
-239.328000 -0.132000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0359  40.9904    4.9  40.4  127.0   1.5567   2.4    4.1	Cyg X-3                       
326.1272  38.3523    3.3  35.1  105.5   1.7409   3.4    2.8	Cyg X-2                       
 33.4307  11.5096    3.6  55.9   10.9   3.5168   3.2 ------	UNKNOWN                       
262.2670  50.7917    2.5  51.0  171.1   3.4325   4.7 ------	UNKNOWN                       
 62.7175  37.2966    3.3  42.4  -35.2   1.3741   3.5 ------	UNKNOWN                       
 78.2807  45.8289    2.8  42.2  -56.7   2.4730   4.1 ------	UNKNOWN                       
197.9542  61.5333    2.2  54.0 -143.5   7.1009   5.3 ------	UNKNOWN                       
173.1012  67.0405    3.4  48.4 -129.8   3.7034   3.4 ------	UNKNOWN                       

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

Time interval of the image:
-0.132000 9.972590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0996  41.0121    2.9  40.3  127.0   0.4855   3.9    3.6	Cyg X-3                       
326.2923  38.4481   18.1  34.9  105.3   0.0553   0.6    9.5	Cyg X-2                       
284.2317  45.5726    3.1  46.9  151.3   0.4524   3.7 ------	UNKNOWN                       
 52.9344  37.0784    0.3  38.5  -24.8   2.7592  45.5 ------	UNKNOWN                       
 65.6971  40.8750    2.2  40.7  -41.1   0.4281   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
66.772600 962.828800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6244  22.0067    0.3  30.5  -58.9  36.1131  36.9    0.7	Crab                          
 19.4800   8.5632    3.7  41.6   65.3   9.4175   3.1 ------	UNKNOWN                       
 36.8697 -12.9876    3.3  52.3   30.0  15.3503   3.5 ------	UNKNOWN                       
 52.3799 -18.8074    3.0  55.9   10.7  16.5616   3.9 ------	UNKNOWN