GRB060313: 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 18:06:27 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger201487
======================================================================

  Trigger: 00201487      Segment: 000

  BAT Trigger Time: 163901527.552   [s; MET]
      Trigger Stop: 163901527.616   [s; MET]
               UTC: 2006-03-13T00:12:06.484480    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 66.6095900742749   Dec: -10.8722794349947  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.57
     Image Trigger?:     NO
     Rate S/N Ratio:     129.36769303037  [ if not an image trigger ]
     Image S/N Ratio:    8.57

  Analysis Position:   [ source = BAT ]
    RA: 66.6095900742749   Dec: -10.8722794349947  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 66.6285900113472   Dec: -10.8590030512581  [deg; J2000]  
        { 04h 26m 30.9s , -10d 51' 32.4" }
         +/- 0.737778857998763 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.267412788085141 [arcmin] (formal 1-sigma fit error)
    SNR: 46.9672604337794
 
  Angular difference between the analysis and refined position is 1.374029 arcmin
 
  Partial Coding Fraction: 0.546875    [ including projection effects ]

  Duration
     T90: 0.743999987840652 +/- 0.0341760179670827
        Measured from: -0.0919999778270721
                   to: 0.65200001001358     [s; relative to TRIGTIME]
     T50: 0.480000019073486 +/- 0.0268328301242448
        Measured from: 0.0879999995231628
                   to: 0.568000018596649     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.183999985456467     
                   to: 0.816000014543533     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.127999991178513     
                   to: 0.756000012159348     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.180435   0.405921   0.551320   0.299390
           0.010563   0.014470   0.017169   0.015565 [error]
 Peak      0.183849   0.409592   0.553964   0.303282
           0.010918   0.014743   0.017343   0.015688 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.884   -0.128    0.756
T90     0.744   -0.092    0.652
T50     0.480    0.088    0.568
Peak    1.000   -0.184    0.816
 
 
====== 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      -0.684    -0.065      0.065       -           -               -         1.05e-01     -3.93e-03          3.92e-03      65.220   57
CPL     -0.605    -0.103      0.248      999.755    -999.755      -999.755      1.15e-01     -1.15e-02          2.88e-02      64.970   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      -0.687     -0.065     0.066       -           -               -         9.39e-02     -3.53e-03          3.52e-03      67.340   57
CPL     -0.626     -0.087     0.265      999.066    -999.066      -999.066      1.02e-01     -1.10e-02          2.39e-02      67.540   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   5.57e-08  1.70e-07  4.22e-07  2.96e-06  1.14e-06  3.61e-06   erg/cm2
      90%_error_low -4.36e-09 -7.95e-09 -1.62e-08 -2.64e-07 -4.56e-08 -2.72e-07   erg/cm2
      90%_error_hi   4.49e-09  7.90e-09  1.62e-08  2.83e-07  4.57e-08  2.89e-07   erg/cm2
Peak flux       PL   1.78e+00  2.93e+00  3.64e+00  8.95e+00  1.09e+01  1.73e+01   ph/cm2/s
      90%_error_low -1.43e-01 -1.44e-01 -1.37e-01 -7.40e-01 -3.93e-01 -7.87e-01   ph/cm2/s
      90%_error_hi   1.48e-01  1.43e-01  1.36e-01  7.85e-01  3.93e-01  8.09e-01   ph/cm2/s
 
Fluence        CPL   5.48e-08  1.70e-07  4.26e-07  2.76e-06  1.14e-06  3.30e-06   erg/cm2
      90%_error_low -6.07e-09 -8.11e-09 -1.94e-08 -8.04e-07 -4.48e-08 -6.79e-07   erg/cm2
      90%_error_hi   4.73e-09  8.20e-09  2.04e-08  2.77e-07  4.34e-08  3.87e-07   erg/cm2
Peak flux      CPL   2.22e-05  2.93e+00  3.94e-02  1.03e+01  1.09e+01  1.03e+01   ph/cm2/s
      90%_error_low     N/A   -1.50e-01 -3.94e-02 -6.63e+00 -3.91e-01 4.51e+00   ph/cm2/s
      90%_error_hi      N/A    9.41e-02  -3.76e-02  4.37e+00  3.97e-01  7.71e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   66.6286   -10.8590   0.0041    31.4538   151.1514         1.5146444     46.967 TRIG_00201487                 
 
Foreground time interval of the image:
 -0.128   0.756 (delta_t =   0.884 [sec])
Background time interval of the image:
-299.552  -0.128 (delta_t = 299.424 [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   -0.128 sec. to    0.756 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.683652     ( -0.064594   0.0653897 )
Norm@50keV  : 0.105296    ( -0.00392915   0.00391502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.22 using 59 PHA bins.
# Reduced chi-squared =          1.144 for     57 degrees of freedom 
# Null hypothesis probability =   2.124955e-01
 
Photon flux (15-150 keV)    in 0.884 sec: 12.1875 ( -0.4379  0.4381 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.14475e-06 ( -4.55901e-08  4.56995e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.128 sec. to    0.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.605326     ( -0.103339   0.248047 )
Epeak [keV] : 999.755      ( -999.93 -999.93 )
Norm@50keV  : 0.114523    ( -0.0114848   0.0288043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.97 using 59 PHA bins.
# Reduced chi-squared =          1.160 for     56 degrees of freedom 
# Null hypothesis probability =   1.925623e-01
 
Photon flux (15-150 keV)    in 0.884 sec: 12.1677 ( -0.4545  0.4276 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13981e-06 ( -4.47914e-08  4.34265e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.184 sec. to    0.816 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.686696     ( -0.0651333   0.0659651 )
Norm@50keV  : 9.39091E-02    ( -0.00353164   0.00351818 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.34 using 59 PHA bins.
# Reduced chi-squared =          1.181 for     57 degrees of freedom 
# Null hypothesis probability =   1.643424e-01
 
Photon flux (15-150 keV)    in 1 sec: 10.8667 ( -0.3931  0.3932 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15332e-06 ( -4.6008e-08  4.61517e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.184 sec. to    0.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.678556     ( -0.087059   0.265153 )
Epeak [keV] : 9997.74      ( -9997.58 -9997.58 )
Norm@50keV  : 9.46510E-02    ( -0.00371242   0.0312434 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.29 using 59 PHA bins.
# Reduced chi-squared =          1.202 for     56 degrees of freedom 
# Null hypothesis probability =   1.434817e-01
 
Photon flux (15-150 keV)    in 1 sec: 10.8502 ( -0.3911  0.3974 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15003e-06 ( -5.00115e-08  5.19853e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.744 sec.
Hardness ratio (energy fluence ratio) = 2.49034813954

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

S(15-50 keV)  = 2.2517755e-07
S(50-150 keV) = 9.195812e-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 = -5.357799976885158E-01, IMY = -2.951392593698822E-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:
-299.552000 -0.128000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6582  22.0034    0.9  37.2   83.6  10.9515  12.2    1.5	Crab                          
 69.1732   3.5329    2.7  24.9  123.1   1.1822   4.2 ------	UNKNOWN                       
  9.0437  25.8209    2.2  36.9  -50.6   1.9846   5.3 ------	UNKNOWN                       
 19.3548 -28.4418    2.6  48.5 -135.3   4.2507   4.4 ------	UNKNOWN                       

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

Time interval of the image:
-0.128000 0.756000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6442  22.1343   15.0  37.2   83.4  -0.0693  -0.8    7.2	Crab                          
 66.6286 -10.8590    0.2  31.5  151.2   1.5147  47.0 ------	UNKNOWN                       
 40.7982  67.2504    2.5  54.5   10.9   0.5637   4.6 ------	UNKNOWN                       
 68.0647 -39.7367    2.0  56.5  172.8   0.8115   5.7 ------	UNKNOWN                       
 51.0918 -13.0061    2.5  26.4 -178.5   0.1154   4.7 ------	UNKNOWN                       
 39.9233 -30.6946    1.8  43.9 -159.5   0.2628   6.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
62.148590 302.521400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6282  22.0156    0.4  36.9   26.9   9.8317  32.5    0.3	Crab                          
 96.6017  -3.0681    2.7  30.8   77.6   1.4190   4.2 ------	UNKNOWN                       
 70.9986  -0.5914    2.9  11.2   23.4   0.7096   4.0 ------	UNKNOWN                       
 63.9651   4.2536    3.3  15.3  -10.0   0.6572   3.5 ------	UNKNOWN                       
 62.7414 -32.7057    3.2  22.1 -171.3   0.6705   3.6 ------	UNKNOWN