GRB061102: 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: Wed Jan 22 12:08:00 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger236430
======================================================================

  Trigger: 00236430      Segment: 000

  BAT Trigger Time: 184122032.768   [s; MET]
      Trigger Stop: 184122044.928   [s; MET]
               UTC: 2006-11-02T01:00:31.223660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 148.405245009419   Dec: -17.0663699042152  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.75
     Image Trigger?:     NO
     Rate S/N Ratio:     11.0453610171873  [ if not an image trigger ]
     Image S/N Ratio:    6.75

  Analysis Position:   [ source = BAT ]
    RA: 148.405245009419   Dec: -17.0663699042152  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 148.392112266351   Dec: -17.0292003138623  [deg; J2000]  
        { 09h 53m 34.1s , -17d 01' 45.1" }
         +/- 2.59732856703577 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.1709337598613 [arcmin] (formal 1-sigma fit error)
    SNR: 7.77923883872221
 
  Angular difference between the analysis and refined position is 2.353977 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 45.5440000295639 +/- 9.68761787874109
        Measured from: 1.29999998211861
                   to: 46.8440000116825     [s; relative to TRIGTIME]
     T50: 21.3440000116825 +/- 17.0710144982526
        Measured from: 6.92399999499321
                   to: 28.2680000066757     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 14.66400000453     
                   to: 15.66400000453     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.995999991893768     
                   to: 48.7999999821186     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.115351   0.206011   0.146146   0.033231
           0.031799   0.033149   0.029474   0.026357 [error]
 Peak      0.008411   0.015634   0.002918   0.005618
           0.004516   0.004746   0.004202   0.003754 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   49.796   -0.996   48.800
T90    45.544    1.300   46.844
T50    21.344    6.924   28.268
Peak    1.000   14.664   15.664
 
 
====== 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      -1.474    -0.366      0.362       -           -               -         5.82e-04     -1.28e-04          1.25e-04      64.310   57
CPL     -1.375    -1.367      1.364      275.976    -275.976      -275.976      6.63e-04     -2.08e-04          3.21e-03      64.360   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      -1.921     -0.911     0.692       -           -               -         1.69e-03     -9.52e-04          9.00e-04      52.050   57
CPL      1.752     -3.900    -1.752       42.990     -42.990       -42.990      2.01e-01     -2.01e-01          1.32e+04      50.010   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   3.61e-08  6.75e-08  9.71e-08  2.97e-07  2.76e-07  4.97e-07   erg/cm2
      90%_error_low -1.14e-08 -1.40e-08 -2.80e-08 -1.45e-07 -6.64e-08 -1.75e-07   erg/cm2
      90%_error_hi   1.21e-08  1.39e-08  2.81e-08  2.23e-07  6.87e-08  2.41e-07   erg/cm2
Peak flux       PL   1.05e-01  8.21e-02  4.34e-02  3.33e-02  2.45e-01  2.63e-01   ph/cm2/s
      90%_error_low -5.39e-02 -3.53e-02 -2.85e-02 -3.33e-02 -1.03e-01 -1.13e-01   ph/cm2/s
      90%_error_hi   5.83e-02  3.48e-02  3.15e-02  6.21e-02  1.03e-01  1.17e-01   ph/cm2/s
 
Fluence        CPL   3.62e-08  6.73e-08  9.71e-08  3.01e-07  2.77e-07  4.98e-07   erg/cm2
      90%_error_low -1.15e-08 -1.35e-08 -2.81e-08 -2.20e-07 -8.01e-08 -1.96e-07   erg/cm2
      90%_error_hi   1.14e-08  9.32e-09  2.86e-08  2.20e-07  5.41e-08  1.14e-07   erg/cm2
Peak flux      CPL   6.12e-02  1.20e-01  4.08e-02  1.02e-03  2.24e-01  2.23e-01   ph/cm2/s
      90%_error_low -6.12e-02 -5.53e-02 -4.08e-02 -1.02e-03 -1.15e-01 -1.14e-01   ph/cm2/s
      90%_error_hi   8.19e-02  5.42e-02  3.85e-02  4.52e-02  1.05e-01  1.07e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  148.3921   -17.0292   0.0246     5.7895  -160.7003         0.5153315      7.779 TRIG_00236430                 
 
Foreground time interval of the image:
 -0.996  48.800 (delta_t =  49.796 [sec])
Background time interval of the image:
-239.768  -0.996 (delta_t = 238.772 [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   -0.996 sec. to   48.800 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47419     ( -0.366171   0.361617 )
Norm@50keV  : 5.82263E-04    ( -0.000127815   0.000124879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.31 using 59 PHA bins.
# Reduced chi-squared =          1.128 for     57 degrees of freedom 
# Null hypothesis probability =   2.359259e-01
 
Photon flux (15-150 keV)    in 49.8 sec: 7.21981E-02 ( -0.0146477  0.0146534 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.76312e-07 ( -6.64471e-08  6.86961e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.996 sec. to   48.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.4718     ( -1.35514   1.37603 )
Epeak [keV] : 9997.66      ( -9998.33 -9998.33 )
Norm@50keV  : 5.84072E-04    ( -0.000128743   0.00328719 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.31 using 59 PHA bins.
# Reduced chi-squared =          1.148 for     56 degrees of freedom 
# Null hypothesis probability =   2.083891e-01
 
Photon flux (15-150 keV)    in 49.8 sec: 7.22544E-02 ( -0.0147081  0.0146194 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.76783e-07 ( -8.00988e-08  5.41037e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   14.664 sec. to   15.664 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.92103     ( -0.911588   0.691134 )
Norm@50keV  : 1.69320E-03    ( -0.000952082   0.000899818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.05 using 59 PHA bins.
# Reduced chi-squared =         0.9131 for     57 degrees of freedom 
# Null hypothesis probability =   6.609221e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.245211 ( -0.102802  0.102977 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.55776e-08 ( -7.83869e-09  8.72764e-09 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   14.664 sec. to   15.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.75189     ( -3.97149   -1.8234 )
Epeak [keV] : 42.9898      ( -43.021 -43.021 )
Norm@50keV  : 0.201424    ( -0.254997   13177.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.01 using 59 PHA bins.
# Reduced chi-squared =         0.8930 for     56 degrees of freedom 
# Null hypothesis probability =   6.998965e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.224318 ( -0.11548  0.105257 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32672e-08 ( -5.66901e-09  7.48528e-09 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 45.544 sec.
Hardness ratio (energy fluence ratio) = 1.43979310195

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

S(15-50 keV)  = 1.0360604e-07
S(50-150 keV) = 1.7270581e-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 = -9.569325277133812E-02, IMY = 3.351070581421199E-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:
-239.768000 -0.996000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5310 -40.6054   12.7  20.4    8.2   0.1486   0.9    3.0	Vela X-1                      
170.1748 -60.6498    2.4  42.5  -31.0   1.3818   4.8    4.4	Cen X-3                       
186.4800 -62.9650    4.3  49.5  -36.4  -1.5553  -2.7   12.6	GX 301-2                      
122.6817   1.5330    2.6  32.1  120.9   1.2905   4.5 ------	UNKNOWN                       
154.1886  14.1064    2.4  37.1 -178.5   1.1148   4.8 ------	UNKNOWN                       
188.2839 -10.2390    2.6  42.9 -111.9   3.4095   4.5 ------	UNKNOWN                       

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

Time interval of the image:
-0.996000 48.800000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3142 -40.6575    4.6  20.5    8.6  -0.1751  -2.5   11.5	Vela X-1                      
170.0698 -60.5919    7.9  42.4  -31.0  -0.1692  -1.5    7.5	Cen X-3                       
186.6114 -62.8285   52.4  49.5  -36.6  -0.0477  -0.2    3.7	GX 301-2                      
 94.2713 -41.6725    2.7  46.7   39.6   1.0421   4.2 ------	UNKNOWN                       
148.3921 -17.0291    1.5   5.8 -160.7   0.5151   7.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
89.132600 275.732590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6863 -40.6372    7.1  26.0   13.7   0.2381   1.6    8.7	Vela X-1                      
170.1882 -60.6652    7.4  46.3  -23.3   0.4049   1.5    4.5	Cen X-3                       
186.4228 -62.7890    3.3  52.7  -29.4   1.5615   3.5    6.5	GX 301-2                      
121.3267   8.0997    2.7  36.8  122.4   1.3352   4.2 ------	UNKNOWN                       
106.3617 -37.8778    3.2  42.2   43.2   1.4037   3.6 ------	UNKNOWN                       
168.2571 -54.9632    2.5  40.8  -26.0   0.9528   4.7 ------	UNKNOWN                       
194.1406 -43.5874    2.5  46.7  -54.1   3.0341   4.7 ------	UNKNOWN