GRB060312: 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 18:08:58 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger201391
======================================================================

  Trigger: 00201391      Segment: 000

  BAT Trigger Time: 163820173.824   [s; MET]
      Trigger Stop: 163820174.848   [s; MET]
               UTC: 2006-03-12T01:36:12.758340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 45.7682083493773   Dec: 12.8200326522603  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.02
     Image Trigger?:     NO
     Rate S/N Ratio:     14.6628782986152  [ if not an image trigger ]
     Image S/N Ratio:    8.02

  Analysis Position:   [ source = BAT ]
    RA: 45.7682083493773   Dec: 12.8200326522603  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 45.7838548149859   Dec: 12.8248190949887  [deg; J2000]  
        { 03h 03m 08.1s , +12d 49' 29.3" }
         +/- 0.858836081840266 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.215980760751576 [arcmin] (formal 1-sigma fit error)
    SNR: 37.8035219793428
 
  Angular difference between the analysis and refined position is 0.959370 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 44.6560000181198 +/- 3.23408410540887
        Measured from: -25.7520000040531
                   to: 18.9040000140667     [s; relative to TRIGTIME]
     T50: 15.7840000092983 +/- 1.56688225459704
        Measured from: -6.64399999380112
                   to: 9.14000001549721     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.63199999928474     
                   to: 6.63199999928474     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -29.272000014782     
                   to: 29.4239999949932     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.179177   1.424628   0.787942   0.178074
           0.040058   0.041633   0.035916   0.029742 [error]
 Peak      0.050512   0.080161   0.054112   0.008866
           0.005788   0.006171   0.005364   0.004219 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   58.696  -29.272   29.424
T90    44.656  -25.752   18.904
T50    15.784   -6.644    9.140
Peak    1.000    5.632    6.632
 
 
====== 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: CPL)
 
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      -1.817    -0.074      0.073       -           -               -         3.57e-03     -1.48e-04          1.47e-04      56.740   57
CPL     -1.353    -0.312      0.340       64.703     -10.861        38.286      6.26e-03     -1.94e-03          3.15e-03      50.090   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      -1.530     -0.154     0.152       -           -               -         1.19e-02     -1.16e-03          1.15e-03      52.030   57
CPL     -0.716     -0.662     0.787       72.303     -17.094       106.688      3.30e-02     -1.83e-02          5.44e-02      47.500   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   3.60e-07  5.46e-07  6.20e-07  1.34e-06  1.93e-06  2.87e-06   erg/cm2
      90%_error_low -2.32e-08 -2.12e-08 -3.53e-08 -1.56e-07 -8.12e-08 -1.86e-07   erg/cm2
      90%_error_hi   2.37e-08  2.12e-08  3.54e-08  1.70e-07  8.17e-08  1.97e-07   erg/cm2
Peak flux       PL   5.04e-01  4.99e-01  3.45e-01  3.77e-01  1.50e+00  1.73e+00   ph/cm2/s
      90%_error_low -7.19e-02 -4.69e-02 -4.25e-02 -8.45e-02 -1.37e-01 -1.63e-01   ph/cm2/s
      90%_error_hi   7.44e-02  4.67e-02  4.24e-02  9.83e-02  1.37e-01  1.64e-01   ph/cm2/s
 
Fluence        CPL   3.35e-07  5.69e-07  6.21e-07  6.53e-07  1.84e-06  2.18e-06   erg/cm2
      90%_error_low -2.81e-08 -2.64e-08 -3.79e-08 -2.32e-07 -9.99e-08 -2.55e-07   erg/cm2
      90%_error_hi   2.85e-08  2.68e-08  3.78e-08  3.86e-07  1.00e-07  3.97e-07   erg/cm2
Peak flux      CPL   4.54e-01  5.47e-01  3.57e-01  1.47e-01  1.46e+00  1.50e+00   ph/cm2/s
      90%_error_low -8.36e-02 -6.13e-02 -4.82e-02 -7.83e-02 -1.42e-01 -1.64e-01   ph/cm2/s
      90%_error_hi   8.48e-02  6.36e-02  4.82e-02  1.64e-01  1.41e-01  1.99e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   45.7839    12.8248   0.0051     6.0398  -126.4899         2.7698100     37.804 TRIG_00201391                 
 
Foreground time interval of the image:
-29.272  10.877 (delta_t =  40.149 [sec])
Background time interval of the image:
-299.824 -29.272 (delta_t = 270.552 [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  -29.272 sec. to   29.424 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.81702     ( -0.0739523   0.0732011 )
Norm@50keV  : 3.56648E-03    ( -0.000148136   0.000147382 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.74 using 59 PHA bins.
# Reduced chi-squared =         0.9955 for     57 degrees of freedom 
# Null hypothesis probability =   4.846699e-01
 
Photon flux (15-150 keV)    in 58.7 sec: 0.494761 ( -0.019735  0.019777 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.92659e-06 ( -8.12396e-08  8.16646e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -29.272 sec. to   29.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.35257     ( -0.312469   0.339954 )
Epeak [keV] : 64.7031      ( -10.861 38.2856 )
Norm@50keV  : 6.26371E-03    ( -0.00193866   0.00314907 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.09 using 59 PHA bins.
# Reduced chi-squared =         0.8944 for     56 degrees of freedom 
# Null hypothesis probability =   6.971669e-01
 
Photon flux (15-150 keV)    in 58.7 sec: 0.479949 ( -0.021935  0.021959 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.83695e-06 ( -9.98786e-08  1.0013e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    5.632 sec. to    6.632 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52994     ( -0.154172   0.151864 )
Norm@50keV  : 1.19061E-02    ( -0.00115822   0.00114868 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.03 using 59 PHA bins.
# Reduced chi-squared =         0.9129 for     57 degrees of freedom 
# Null hypothesis probability =   6.614711e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.49869 ( -0.13715  0.13719 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12432e-07 ( -1.19427e-08  1.20854e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    5.632 sec. to    6.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.715631     ( -0.662335   0.786658 )
Epeak [keV] : 72.3034      ( -17.0945 106.687 )
Norm@50keV  : 3.29708E-02    ( -0.0183107   0.0544075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.50 using 59 PHA bins.
# Reduced chi-squared =         0.8482 for     56 degrees of freedom 
# Null hypothesis probability =   7.834271e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.45688 ( -0.14154  0.14145 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04097e-07 ( -1.34278e-08  1.37775e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 44.656 sec.
Hardness ratio (energy fluence ratio) = 1.0902093609

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

S(15-50 keV)  = 9.04878e-07
S(50-150 keV) = 9.320652e-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 = -6.292077824691585E-02, IMY = 8.506399326064371E-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:
-299.824000 -29.272000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6342  22.0208    0.4  31.7   80.1  11.8902  26.8    0.4	Crab                          
 92.8919  33.2685    2.7  41.5   63.3   3.5161   4.3 ------	UNKNOWN                       
 52.9562 -20.1917    2.7  37.1 -179.1   1.1474   4.2 ------	UNKNOWN                       
 26.2748  62.3029    2.4  48.5   -9.9   1.7856   4.7 ------	UNKNOWN                       
 38.7838 -36.0470    3.1  54.0 -163.5   2.2681   3.7 ------	UNKNOWN                       
 19.4541 -21.0824    3.8  48.6 -135.4   2.7607   3.0 ------	UNKNOWN                       

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

Time interval of the image:
-29.272000 10.876600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5868  22.1504   56.4  31.6   79.8  -0.0275  -0.2    8.6	Crab                          
 59.4686  58.2885    2.8  42.0   11.9   0.4666   4.2 ------	UNKNOWN                       
 54.6435 -35.3705    2.4  52.4 -179.5   0.9488   4.8 ------	UNKNOWN                       
 45.7839  12.8248    0.3   6.0 -126.5   2.7698  37.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
38.876600 302.198000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6450  22.0146    0.7  37.2   83.6  11.0524  15.5    0.7	Crab                          
 27.3302  52.4599    2.5  42.3   -3.4   1.3170   4.6 ------	UNKNOWN