GRB171004A: 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: Fri Oct 20 14:27:44 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger776347
======================================================================

  Trigger: 00776347      Segment: 000

  BAT Trigger Time: 528796552   [s; MET]
      Trigger Stop: 528796640   [s; MET]
               UTC: 2017-10-04T07:55:32.213440    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 139.161615042698   Dec: 52.6799760162536  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.15
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    15.15

  Analysis Position:   [ source = BAT ]
    RA: 139.161615042698   Dec: 52.6799760162536  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 139.146324049161   Dec: 52.6850512156684  [deg; J2000]  
        { 09h 16m 35.1s , +52d 41' 06.2" }
         +/- 1.27284867325174 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.391004819460118 [arcmin] (formal 1-sigma fit error)
    SNR: 21.5495037724106
 
  Angular difference between the analysis and refined position is 0.634096 arcmin
 
  Partial Coding Fraction: 0.421875    [ including projection effects ]

  Duration
     T90: 105.539999961853 +/- 14.3064433213744
        Measured from: 15.3439999818802
                   to: 120.883999943733     [s; relative to TRIGTIME]
     T50: 44.8079999685287 +/- 7.64174015467547
        Measured from: 31.0199999809265
                   to: 75.8279999494553     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 48.339999973774     
                   to: 49.339999973774     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 10.5879999995232     
                   to: 136.976000010967     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.419394   1.634962   1.247011   0.342993
           0.100499   0.105177   0.092404   0.081000 [error]
 Peak      0.041803   0.038029   0.020514   0.006670
           0.009940   0.009933   0.008353   0.007582 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  126.388   10.588  136.976
T90   105.540   15.344  120.884
T50    44.808   31.020   75.828
Peak    1.000   48.340   49.340
 
 
====== 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      -1.674    -0.127      0.125       -           -               -         2.49e-03     -1.76e-04          1.75e-04      54.000   57
CPL     -1.655    -0.896      0.381      874.367    -874.356      -874.367      2.55e-03     -2.30e-04          1.15e-04      54.050   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      -1.879     -0.612     0.545       -           -               -         6.49e-03     -2.24e-03          2.04e-03      51.050   57
CPL     -1.899     -0.870     1.178     9999.360      N/A           N/A         6.45e-03        N/A               N/A         51.050   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   4.73e-07  7.82e-07  9.80e-07  2.44e-06  2.92e-06  4.68e-06   erg/cm2
      90%_error_low -5.52e-08 -5.55e-08 -9.21e-08 -4.61e-07 -2.16e-07 -5.38e-07   erg/cm2
      90%_error_hi   5.73e-08  5.53e-08  9.15e-08  5.28e-07  2.17e-07  5.89e-07   erg/cm2
Peak flux       PL   3.85e-01  3.10e-01  1.69e-01  1.34e-01  9.24e-01  9.97e-01   ph/cm2/s
      90%_error_low -1.67e-01 -8.80e-02 -7.40e-02 -8.85e-02 -2.63e-01 -2.78e-01   ph/cm2/s
      90%_error_hi   1.83e-01  8.70e-02  7.21e-02  1.53e-01  2.63e-01  2.78e-01   ph/cm2/s
 
Fluence        CPL   4.73e-07  7.76e-07  9.75e-07  2.65e-06  2.93e-06  4.70e-06   erg/cm2
      90%_error_low    N/A       N/A    -1.14e-07 -1.30e-06 -2.85e-07 -1.12e-06   erg/cm2
      90%_error_hi     N/A       N/A     1.24e-07  -1.24e-07  2.56e-07  2.72e-07   erg/cm2
Peak flux      CPL   3.68e-01  2.42e-01  1.07e-01  7.80e-02  7.50e-01  7.97e-01   ph/cm2/s
      90%_error_low     N/A   -1.35e-01 -1.07e-01 -7.80e-02     N/A       N/A     ph/cm2/s
      90%_error_hi      N/A    1.49e-01  2.23e-01  8.89e-02     N/A       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
  139.1463    52.6851   0.0089    44.6436    -6.0914         4.4875660     21.550 TRIG_00776347                 
 
Foreground time interval of the image:
 10.588  96.301 (delta_t =  85.713 [sec])
Background time interval of the image:
-651.699 -634.660 (delta_t =  17.040 [sec])
-239.000  10.588 (delta_t = 249.588 [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   10.588 sec. to  136.976 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.67435     ( -0.1265   0.12484 )
Norm@50keV  : 2.48858E-03    ( -0.00017563   0.000174595 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.00 using 59 PHA bins.
# Reduced chi-squared =         0.9473 for     57 degrees of freedom 
# Null hypothesis probability =   5.885010e-01
 
Photon flux (15-150 keV)    in 126.4 sec: 0.327618 ( -0.023278  0.023362 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.91916e-06 ( -2.16214e-07  2.17428e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   10.588 sec. to  136.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.67273     ( -0.895285   0.381322 )
Epeak [keV] : 1.00000E+04      ( -9999.99 -10000 )
Norm@50keV  : 2.49347E-03    ( -0.000176551   0.000168206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.00 using 59 PHA bins.
# Reduced chi-squared =         0.9643 for     56 degrees of freedom 
# Null hypothesis probability =   5.509492e-01
 
Photon flux (15-150 keV)    in 126.4 sec: 0.329116 ( -0.031209  0.027836 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.9331e-06 ( -2.85287e-07  2.55773e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   48.340 sec. to   49.340 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87893     ( -0.611689   0.544812 )
Norm@50keV  : 6.49293E-03    ( -0.00223906   0.00204274 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.05 using 59 PHA bins.
# Reduced chi-squared =         0.8956 for     57 degrees of freedom 
# Null hypothesis probability =   6.967361e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.923638 ( -0.262607  0.263412 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.9698e-08 ( -1.90705e-08  1.95266e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   48.340 sec. to   49.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.56675     ( -0.202254   1.84623 )
Epeak [keV] : 198.187      (   )
Norm@50keV  : 2.96312E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.71 using 59 PHA bins.
# Reduced chi-squared =         0.9056 for     56 degrees of freedom 
# Null hypothesis probability =   6.745867e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.749869 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.46701e-08 ( -2.9954e-08  1.9507e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 105.54 sec.
Hardness ratio (energy fluence ratio) = 1.25325661995

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

S(15-50 keV)  = 1.2549434e-06
S(50-150 keV) = 1.6641877e-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 = 9.820587002473435E-01, IMY = 1.048028123701253E-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:
-651.699390 -634.659800
-239.000000 10.588000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6711  35.2666    0.0  31.4  164.9  -0.0863  -0.3   11.4	Her X-1                       
282.4138  46.6084    2.6  39.8  126.2   2.6233   4.5 ------	UNKNOWN                       
270.7280  77.6797    2.2  29.3   72.0   1.8109   5.1 ------	UNKNOWN                       
137.9266  32.5429    2.9  58.9  -24.4   5.8121   4.0 ------	UNKNOWN                       
185.8189  21.2712    3.2  41.4  -78.2   3.3275   3.6 ------	UNKNOWN                       
213.7333   9.3484    2.3  45.3 -121.2   4.2525   4.9 ------	UNKNOWN                       

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

Time interval of the image:
10.588000 96.300600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5364  35.2919   10.6  31.3  165.0   0.1582   1.1    4.9	Her X-1                       
269.7883  16.7007    2.2  54.3  165.4   2.6422   5.2 ------	UNKNOWN                       
139.1463  52.6851    0.5  44.6   -6.1   4.4882  21.6 ------	UNKNOWN                       
201.7734  30.8226    2.5  26.6  -94.1   0.7043   4.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
163.700600 237.300580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
211.9394  73.6878    3.2  35.6  172.7   0.4360   3.6 ------	UNKNOWN                       
226.8292  41.7959    2.3  56.8 -151.9   2.5902   4.9 ------	UNKNOWN