GRB161017A: 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 v2.46
    Process Start Time: Mon Nov 14 22:02:14 EST 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger718023
======================================================================

  Trigger: 00718023      Segment: 000

  BAT Trigger Time: 498419528.192   [s; MET]
      Trigger Stop: 498419529.216   [s; MET]
               UTC: 2016-10-17T17:51:51.169980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 142.765381319357   Dec: 43.1418079589348  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.53
     Image Trigger?:     NO
     Rate S/N Ratio:     19.5448202856921  [ if not an image trigger ]
     Image S/N Ratio:    8.53

  Analysis Position:   [ source = BAT ]
    RA: 142.765381319357   Dec: 43.1418079589348  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 142.765950837089   Dec: 43.1237910283339  [deg; J2000]  
        { 09h 31m 03.8s , +43d 07' 25.6" }
         +/- 0.919328694193454 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.393986743914146 [arcmin] (formal 1-sigma fit error)
    SNR: 34.3006957395021
 
  Angular difference between the analysis and refined position is 1.081303 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 217.047999918461 +/- 6.86324586240994
        Measured from: -0.807999968528748
                   to: 216.239999949932     [s; relative to TRIGTIME]
     T50: 126.003999948502 +/- 3.4710966645323
        Measured from: 17.1360000371933
                   to: 143.139999985695     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 21.2560000419617     
                   to: 22.2560000419617     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -13.2799999713898     
                   to: 233.420000016689     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.828171   3.352492   2.456268   0.654394
           0.080875   0.084517   0.073984   0.063034 [error]
 Peak      0.091345   0.115948   0.126834   0.036032
           0.006344   0.007140   0.006753   0.005256 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  246.700  -13.280  233.420
T90   217.048   -0.808  216.240
T50   126.004   17.136  143.140
Peak    1.000   21.256   22.256
 
 
====== 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      -1.571    -0.061      0.061       -           -               -         2.32e-03     -7.18e-05          7.17e-05      40.880   57
CPL     -1.571    -0.059      0.114     9999.360    -9999.360      -9999.360      2.32e-03     -6.70e-05          4.72e-04      40.910   56
 
 
=== 1-s peak 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      -1.139     -0.108     0.108       -           -               -         2.41e-02     -1.38e-03          1.38e-03      55.630   57
CPL     -1.140     -0.102     0.115     9999.360    -9999.360      -9999.360      2.42e-02     -1.39e-03          4.76e-03      55.700   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   7.81e-07  1.37e-06  1.85e-06  5.11e-06  5.37e-06  9.12e-06   erg/cm2
      90%_error_low -4.67e-08 -4.69e-08 -7.55e-08 -4.64e-07 -1.78e-07 -5.10e-07   erg/cm2
      90%_error_hi   4.79e-08  4.68e-08  7.53e-08  4.96e-07  1.78e-07  5.35e-07   erg/cm2
Peak flux       PL   7.03e-01  8.78e-01  7.97e-01  1.26e+00  2.81e+00  3.64e+00   ph/cm2/s
      90%_error_low -8.16e-02 -6.13e-02 -5.39e-02 -1.80e-01 -1.65e-01 -2.27e-01   ph/cm2/s
      90%_error_hi   8.50e-02  6.06e-02  5.34e-02  1.99e-01  1.66e-01  2.31e-01   ph/cm2/s
 
Fluence        CPL   7.81e-07  1.37e-06  1.85e-06  5.10e-06  5.37e-06  9.51e-06   erg/cm2
      90%_error_low    N/A       N/A       N/A       N/A    -1.64e-07 -1.59e-06   erg/cm2
      90%_error_hi     N/A       N/A       N/A       N/A     1.78e-07  2.63e-09   erg/cm2
Peak flux      CPL   7.03e-01  8.78e-01  7.95e-01  1.25e+00  2.83e+00  3.64e+00   ph/cm2/s
      90%_error_low     N/A   -6.14e-02 -5.30e-02     N/A   -1.85e-01 -3.07e-01   ph/cm2/s
      90%_error_hi      N/A    6.06e-02  5.69e-02     N/A    1.46e-01  1.97e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  142.7660    43.1238   0.0056     8.7378   -20.0112         1.9352871     34.301 TRIG_00718023                 
 
Foreground time interval of the image:
-13.280  16.109 (delta_t =  29.389 [sec])
Background time interval of the image:
-239.192 -13.280 (delta_t = 225.912 [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  -13.280 sec. to  233.420 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.57131     ( -0.061027   0.0608669 )
Norm@50keV  : 2.31872E-03    ( -7.17833e-05   7.16844e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.88 using 59 PHA bins.
# Reduced chi-squared =         0.7172 for     57 degrees of freedom 
# Null hypothesis probability =   9.471233e-01
 
Photon flux (15-150 keV)    in 246.7 sec: 0.295389 ( -0.00982  0.009866 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.37007e-06 ( -1.78014e-07  1.78479e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -13.280 sec. to  233.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.57125     ( -0.0600781   0.112921 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 2.31957E-03    ( -7.18398e-05   0.000467427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.91 using 59 PHA bins.
# Reduced chi-squared =         0.7305 for     56 degrees of freedom 
# Null hypothesis probability =   9.350110e-01
 
Photon flux (15-150 keV)    in 246.7 sec: 0.296809 ( -0.012541  0.009393 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.36896e-06 ( -1.63976e-07  1.78439e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   21.256 sec. to   22.256 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13916     ( -0.107594   0.108224 )
Norm@50keV  : 2.41255E-02    ( -0.00138245   0.00138237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.63 using 59 PHA bins.
# Reduced chi-squared =         0.9760 for     57 degrees of freedom 
# Null hypothesis probability =   5.264739e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.80998 ( -0.16529  0.16561 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.49201e-07 ( -1.62364e-08  1.63268e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   21.256 sec. to   22.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.14038     ( -0.102924   0.114666 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 2.42485E-02    ( -0.001389   0.00476322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.70 using 59 PHA bins.
# Reduced chi-squared =         0.9947 for     56 degrees of freedom 
# Null hypothesis probability =   4.861066e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.82860 ( -0.18466  0.14623 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.49109e-07 ( -1.62463e-08  1.6321e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 217.048 sec.
Hardness ratio (energy fluence ratio) = 1.34604685489

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

S(15-50 keV)  = 2.1549227e-06
S(50-150 keV) = 3.215105e-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 = 1.444179760002690E-01, IMY = 5.259572672914864E-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:
-239.192000 -13.280000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
290.4850  82.6007    2.7  44.5  163.9   1.8049   4.3 ------	UNKNOWN                       
261.8604  59.9910    2.3  57.8 -170.6   6.4663   5.1 ------	UNKNOWN                       
188.3119  55.3448    2.8  26.6 -137.3   0.8351   4.1 ------	UNKNOWN                       
215.7651  41.8992    3.4  48.5 -130.3   3.1908   3.4 ------	UNKNOWN                       

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

Time interval of the image:
-13.280000 16.108590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
142.7660  43.1238    0.3   8.7  -20.0   1.9351  34.3 ------	UNKNOWN                       
180.0872  35.5990    2.2  30.8  -94.5   0.5456   5.3 ------	UNKNOWN                       
200.5499  35.8425    2.6  43.1 -113.3   1.1223   4.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
46.508600 659.408590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 78.4399  61.4170    3.1  41.3  111.3   6.5017   3.7 ------	UNKNOWN                       
 96.4018  49.6094    2.9  32.1   90.2   3.0861   4.0 ------	UNKNOWN                       
338.0490  87.8338    3.1  49.0  151.3   5.5085   3.7 ------	UNKNOWN                       
113.6721  73.9020    2.9  33.5  138.0   2.2043   3.9 ------	UNKNOWN                       
115.9905  -6.4759    2.8  55.2    5.1   7.1582   4.2 ------	UNKNOWN                       
142.7544  43.1184    0.9   0.0  -38.3   4.8934  12.5 ------	UNKNOWN                       
135.5068  -7.3431    2.3  50.9  -18.6   4.0846   5.0 ------	UNKNOWN                       
204.5400  34.2098    3.6  48.0 -129.0   5.8264   3.2 ------	UNKNOWN                       
154.1105  -7.9277    3.5  52.1  -42.2   6.8922   3.3 ------	UNKNOWN