GRB200716C: 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 22:57:35 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger982707
======================================================================

  Trigger: 00982707      Segment: 000

  BAT Trigger Time: 616633086.72   [s; MET]
      Trigger Stop: 616633086.976   [s; MET]
               UTC: 2020-07-16T22:57:41.424000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 196.012971445604   Dec: 29.6298658681777  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    18.06
     Image Trigger?:     NO
     Rate S/N Ratio:     178.566514218092  [ if not an image trigger ]
     Image S/N Ratio:    18.06

  Analysis Position:   [ source = BAT ]
    RA: 196.012971445604   Dec: 29.6298658681777  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 196.01172944903   Dec: 29.6377359412712  [deg; J2000]  
        { 13h 04m 02.8s , +29d 38' 15.8" }
         +/- 0.8325876795938 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.307771559773814 [arcmin] (formal 1-sigma fit error)
    SNR: 39.5175341337259
 
  Angular difference between the analysis and refined position is 0.476626 arcmin
 
  Partial Coding Fraction: 0.5703125    [ including projection effects ]

  Duration
     T90: 86.5719999074936 +/- 15.1708020454952
        Measured from: -0.0360000133514404
                   to: 86.5359998941422     [s; relative to TRIGTIME]
     T50: 27.3919999599457 +/- 4.82238102160904
        Measured from: 0.635999917984009
                   to: 28.0279998779297     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.180000066757202     
                   to: 0.819999933242798     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.420000076293945     
                   to: 112.631999969482     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.673209   2.200893   1.517843   0.325384
           0.081999   0.086060   0.075962   0.066839 [error]
 Peak      0.232056   0.442855   0.509601   0.189416
           0.014694   0.018280   0.019336   0.015318 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  113.052   -0.420  112.632
T90    86.572   -0.036   86.536
T50    27.392    0.636   28.028
Peak    1.000   -0.180    0.820
 
 
====== 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      -1.624    -0.087      0.086       -           -               -         3.35e-03     -1.60e-04          1.59e-04      34.110   57
CPL     -1.572    -0.133      0.329      374.703    -374.703      -374.703      3.56e-03     -3.60e-04          1.60e-03      34.070   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      -0.977     -0.074     0.075       -           -               -         9.35e-02     -4.01e-03          4.00e-03      57.520   57
CPL     -0.816     -0.215     0.292      428.292    -428.292      -428.292      1.10e-01     -1.93e-02          3.68e-02      56.540   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   5.43e-07  9.26e-07  1.20e-06  3.15e-06  3.53e-06  5.82e-06   erg/cm2
      90%_error_low -4.40e-08 -4.48e-08 -7.64e-08 -4.17e-07 -1.80e-07 -4.76e-07   erg/cm2
      90%_error_hi   4.51e-08  4.47e-08  7.63e-08  4.59e-07  1.81e-07  5.10e-07   erg/cm2
Peak flux       PL   9.00e-04  9.72e-03  1.08e-01  1.08e+01  4.81e-01  8.93e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
Fluence        CPL   5.39e-07  9.30e-07  1.20e-06  2.90e-06  3.52e-06  5.57e-06   erg/cm2
      90%_error_low -5.24e-08 -4.82e-08 -7.83e-08 -1.14e-06 -2.04e-07 -1.16e-06   erg/cm2
      90%_error_hi   3.38e-08  5.27e-08  7.96e-08  3.37e-07  1.92e-07  4.01e-07   erg/cm2
Peak flux      CPL   2.24e+00  3.24e+00  3.33e+00  5.11e+00  1.07e+01  1.39e+01   ph/cm2/s
      90%_error_low -2.56e-01 -1.81e-01 -1.89e-01 -1.25e+00 -4.78e-01 -1.34e+00   ph/cm2/s
      90%_error_hi   2.61e-01  1.82e-01  1.91e-01  1.10e+00  4.78e-01  1.28e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  196.0117    29.6377   0.0049    33.9022   161.3656         3.9504168     39.518 TRIG_00982707                 
 
Foreground time interval of the image:
 -0.420  17.381 (delta_t =  17.801 [sec])
Background time interval of the image:
-239.720  -0.420 (delta_t = 239.300 [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   -0.420 sec. to  112.632 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62401     ( -0.0866432   0.0861124 )
Norm@50keV  : 3.34883E-03    ( -0.000159514   0.000158961 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   34.11     using 59 bins.
 Reduced chi-squared = 0.598421
# Null hypothesis probability of 9.93e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 113.1 sec: 0.433617 ( -0.020792  0.020851 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.53275e-06 ( -1.79676e-07  1.80661e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.420 sec. to  112.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.57159     ( -0.131591   0.329995 )
Epeak [keV] : 374.703      ( -420.529 -420.529 )
Norm@50keV  : 3.55972E-03    ( -0.00035084   0.00160576 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   34.07     using 59 bins.
 Reduced chi-squared = 0.608393
# Null hypothesis probability of 9.91e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 113.1 sec: 0.432321 ( -0.022138  0.0167 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.51716e-06 ( -2.04077e-07  1.924e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.180 sec. to    0.820 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.976735     ( -0.0741708   0.0749161 )
Norm@50keV  : 9.34696E-02    ( -0.00401031   0.00400198 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.52     using 59 bins.
 Reduced chi-squared = 1.00912
# Null hypothesis probability of 4.56e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.480692 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01932e-06 ( -4.76026e-08  4.77183e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.180 sec. to    0.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.816047     ( -0.215316   0.291802 )
Epeak [keV] : 428.292      ( -428.292 -428.292 )
Norm@50keV  : 0.110176    ( -0.0193031   0.0368469 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.54     using 59 bins.
 Reduced chi-squared = 1.00964
# Null hypothesis probability of 4.55e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 10.6894 ( -0.4778  0.4779 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01284e-06 ( -4.93438e-08  4.9149e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 86.572 sec.
Hardness ratio (energy fluence ratio) = 1.29777628942

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

S(15-50 keV)  = 1.4690712e-06
S(50-150 keV) = 2.0636862e-06

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 = -6.367983277053566E-01, IMY = -2.147321580813681E-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:
-239.720000 -0.420000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
291.4881  62.0342    3.0  46.5   46.0   4.0323   3.9 ------	UNKNOWN                       
323.4578  72.1868    3.1  44.2   24.1   1.8650   3.8 ------	UNKNOWN                       
123.0469  45.3536    2.4  35.3  -81.6   3.0183   4.8 ------	UNKNOWN                       
 62.3918  53.7926    2.8  54.2  -31.4   6.0072   4.2 ------	UNKNOWN                       
144.1225  22.2499    2.2  45.7 -123.8   6.1336   5.3 ------	UNKNOWN                       
102.9108  46.9453    2.9  43.6  -63.8   4.6314   3.9 ------	UNKNOWN                       
 99.0528  47.6366    2.5  44.9  -60.3   6.0301   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-0.420000 17.380600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
304.2602  61.6525    2.5  50.2   39.6   1.5856   4.6 ------	UNKNOWN                       
196.0117  29.6377    0.3  33.9  161.4   3.9505  39.5 ------	UNKNOWN                       
189.8459  30.5745    2.7  31.8  170.6   0.3608   4.2 ------	UNKNOWN                       
 12.7054  62.7089    2.7  55.3    1.6   1.2121   4.3 ------	UNKNOWN                       
140.1057  43.6767    2.7  28.6 -101.2   0.4691   4.3 ------	UNKNOWN                       
 94.2878  48.7931    2.4  46.1  -55.9   1.4045   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
71.980590 962.413500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
238.8816  27.6339    3.0  37.5   68.5   6.2237   3.9 ------	UNKNOWN                       
160.6311  69.5664    3.3  44.7  -30.4   4.9619   3.5 ------	UNKNOWN                       
163.1568   1.3278    3.1  42.2 -139.8   5.5827   3.7 ------	UNKNOWN                       
161.2461  24.3754    3.9  31.3 -105.0   5.0908   4.2 ------	UNKNOWN                       
160.9311  24.4137    4.0  31.6 -104.7   5.7013   4.7 ------	UNKNOWN                       
153.3352   9.0991    3.5  44.8 -122.0  10.5208   3.3 ------	UNKNOWN                       
152.0554  13.1332    2.4  43.8 -116.2  17.0777   4.7 ------	UNKNOWN                       
153.7654   3.0919    2.9  48.0 -129.1  16.0100   4.0 ------	UNKNOWN                       
142.3368  50.5503    3.5  44.8  -60.3  12.4663   3.3 ------	UNKNOWN