GRB051113: 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 19:36:18 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger163765
======================================================================

  Trigger: 00163765      Segment: 000

  BAT Trigger Time: 153588154.56   [s; MET]
      Trigger Stop: 153588155.584   [s; MET]
               UTC: 2005-11-13T15:22:34.722320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 187.222134587575   Dec: -26.3906051826446  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.43
     Image Trigger?:     NO
     Rate S/N Ratio:     13.7113092008021  [ if not an image trigger ]
     Image S/N Ratio:    7.43

  Analysis Position:   [ source = BAT ]
    RA: 187.222134587575   Dec: -26.3906051826446  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 187.245437407306   Dec: -26.3915275935324  [deg; J2000]  
        { 12h 28m 58.9s , -26d 23' 29.5" }
         +/- 1.44481950436595 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.495592608062051 [arcmin] (formal 1-sigma fit error)
    SNR: 17.9809752465565
 
  Angular difference between the analysis and refined position is 1.253676 arcmin
 
  Partial Coding Fraction: 0.2460938    [ including projection effects ]

  Duration
     T90: 93.2960000038147 +/- 13.6124227002841
        Measured from: -28.1920000016689
                   to: 65.1040000021458     [s; relative to TRIGTIME]
     T50: 38.1840000152588 +/- 24.4029054809592
        Measured from: -20.3280000090599
                   to: 17.8560000061989     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.27199998497963     
                   to: 1.27199998497963     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -30.7479999959469     
                   to: 67.3319999873638     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.188147   1.467127   1.159436   0.213687
           0.098773   0.103251   0.090182   0.076810 [error]
 Peak      0.062155   0.095800   0.075635   0.022588
           0.010849   0.012245   0.011389   0.008642 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   98.080  -30.748   67.332
T90    93.296  -28.192   65.104
T50    38.184  -20.328   17.856
Peak    1.000    0.272    1.272
 
 
====== 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      -1.686    -0.136      0.134       -           -               -         2.84e-03     -2.26e-04          2.24e-04      61.520   57
CPL     -1.489    -0.258      0.531      130.049     -62.907      -130.049      3.58e-03     -1.06e-03          2.93e-03      61.050   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      -1.491     -0.243     0.239       -           -               -         1.77e-02     -2.51e-03          2.49e-03      46.090   57
CPL     -1.494     -0.239     0.277     9999.260    -9999.260      -9999.260      1.77e-02     -1.40e-02          2.41e-02      46.090   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   4.24e-07  6.96e-07  8.65e-07  2.13e-06  2.58e-06  4.11e-06   erg/cm2
      90%_error_low -5.27e-08 -5.41e-08 -9.09e-08 -4.38e-07 -2.15e-07 -5.20e-07   erg/cm2
      90%_error_hi   5.46e-08  5.40e-08  9.04e-08  5.07e-07  2.16e-07  5.72e-07   erg/cm2
Peak flux       PL   7.20e-01  7.29e-01  5.19e-01  5.88e-01  2.20e+00  2.56e+00   ph/cm2/s
      90%_error_low -1.70e-01 -1.11e-01 -9.16e-02 -1.88e-01 -3.14e-01 -3.59e-01   ph/cm2/s
      90%_error_hi   1.81e-01  1.09e-01  8.97e-02  2.33e-01  3.15e-01  3.60e-01   ph/cm2/s
 
Fluence        CPL   4.10e-07  7.10e-07  8.77e-07  1.58e-06  2.55e-06  3.58e-06   erg/cm2
      90%_error_low -6.29e-08 -6.34e-08 -9.58e-08 -7.86e-07 -2.30e-07 -8.19e-07   erg/cm2
      90%_error_hi   5.94e-08  6.55e-08  9.80e-08  6.76e-07  2.30e-07  7.45e-07   erg/cm2
Peak flux      CPL   7.36e-01  7.19e-01  5.12e-01  6.59e-01  2.21e+00  2.64e+00   ph/cm2/s
      90%_error_low -2.28e-01 -1.22e-01 -1.15e-01 -4.10e-01 -3.92e-01 -5.82e-01   ph/cm2/s
      90%_error_hi   2.16e-01  1.55e-01  1.37e-01  4.67e-02  3.73e-01  3.49e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  187.2454   -26.3915   0.0107    42.2245   -48.7396         4.3982655     17.981 TRIG_00163765                 
 
Foreground time interval of the image:
-30.748  67.332 (delta_t =  98.080 [sec])
Background time interval of the image:
-299.560 -30.748 (delta_t = 268.812 [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  -30.748 sec. to   67.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.68636     ( -0.13626   0.13404 )
Norm@50keV  : 2.84210E-03    ( -0.000225721   0.000224089 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.52 using 59 PHA bins.
# Reduced chi-squared =          1.079 for     57 degrees of freedom 
# Null hypothesis probability =   3.173936e-01
 
Photon flux (15-150 keV)    in 98.08 sec: 0.375698 ( -0.029326  0.029381 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.58416e-06 ( -2.14533e-07  2.16047e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -30.748 sec. to   67.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.48919     ( -0.257726   0.530599 )
Epeak [keV] : 130.049      ( -62.9076 -130.049 )
Norm@50keV  : 3.57617E-03    ( -0.00105581   0.00293322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.05 using 59 PHA bins.
# Reduced chi-squared =          1.090 for     56 degrees of freedom 
# Null hypothesis probability =   2.994780e-01
 
Photon flux (15-150 keV)    in 98.08 sec: 0.372175 ( -0.030581  0.030574 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.55124e-06 ( -2.29835e-07  2.30015e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.272 sec. to    1.272 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.4907     ( -0.243031   0.23948 )
Norm@50keV  : 1.76625E-02    ( -0.00250934   0.00249335 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.09 using 59 PHA bins.
# Reduced chi-squared =         0.8085 for     57 degrees of freedom 
# Null hypothesis probability =   8.490208e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.19956 ( -0.31439  0.31499 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.67834e-07 ( -2.58269e-08  2.59911e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.272 sec. to    1.272 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49403     ( -0.240277   0.275823 )
Epeak [keV] : 9999.26      ( -9999.35 -9999.35 )
Norm@50keV  : 1.76720E-02    ( -0.0139954   0.0240825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.09 using 59 PHA bins.
# Reduced chi-squared =         0.8231 for     56 degrees of freedom 
# Null hypothesis probability =   8.248095e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.20849 ( -0.39179  0.37269 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.68807e-07 ( -3.26594e-08  3.08801e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 93.296 sec.
Hardness ratio (energy fluence ratio) = 1.24288232617

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

S(15-50 keV)  = 1.1196582e-06
S(50-150 keV) = 1.4645297e-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 = 5.984960676384176E-01, IMY = 6.822030126724233E-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:
-299.560000 -30.748000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
210.9442  61.9657    2.9  49.5  148.6   2.8386   3.9 ------	UNKNOWN                       
238.1786  46.4328    2.7  53.0  176.5   2.2318   4.3 ------	UNKNOWN                       
243.1856  43.7814    2.6  55.8 -179.3   3.3905   4.5 ------	UNKNOWN                       
217.9668  23.4449    2.6  31.2 -156.0   0.7980   4.4 ------	UNKNOWN                       
211.8578   2.5366    2.6  29.0 -112.1   1.0120   4.4 ------	UNKNOWN                       
159.2936 -35.5459    2.5  57.1  -21.2   3.3407   4.6 ------	UNKNOWN                       
161.1313 -38.3826    2.9  58.9  -24.3   4.6001   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-30.748000 67.332000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
152.2483 -18.9546    2.5  47.9   -2.0   0.9584   4.6 ------	UNKNOWN                       
208.5478  15.1787    1.9  22.0 -138.2   0.6363   6.1 ------	UNKNOWN                       
187.2454 -26.3915    0.6  42.2  -48.7   4.3985  18.0 ------	UNKNOWN                       
235.4889   7.9571    2.5  49.2 -133.6   2.2982   4.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image: