GRB051213: 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 19:25:30 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger172516
======================================================================

  Trigger: 00172516      Segment: 000

  BAT Trigger Time: 156150784   [s; MET]
      Trigger Stop: 156150848   [s; MET]
               UTC: 2005-12-13T07:13:04.106720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 252.122941460355   Dec: -59.2071286962437  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.98
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.98

  Analysis Position:   [ source = BAT ]
    RA: 252.122941460355   Dec: -59.2071286962437  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 252.093364824192   Dec: -59.2311940407631  [deg; J2000]  
        { 16h 48m 22.4s , -59d 13' 52.3" }
         +/- 1.80678421406279 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.708466755787865 [arcmin] (formal 1-sigma fit error)
    SNR: 13.0649995137918
 
  Angular difference between the analysis and refined position is 1.705773 arcmin
 
  Partial Coding Fraction: 0.6796875    [ including projection effects ]

  Duration
     T90: 71.055999994278 +/- 5.11445675826237
        Measured from: -8.34799998998642
                   to: 62.7080000042915     [s; relative to TRIGTIME]
     T50: 53.0799999833107 +/- 5.35724143427309
        Measured from: -1.391999989748
                   to: 51.6879999935627     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 48.8840000033379     
                   to: 49.8840000033379     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.7240000069141     
                   to: 66.5879999995232     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.356522   0.579141   0.338448   0.061417
           0.053496   0.052990   0.045343   0.037382 [error]
 Peak      0.007520   0.026360   0.023307   0.009006
           0.006042   0.006173   0.005286   0.004364 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   77.312  -10.724   66.588
T90    71.056   -8.348   62.708
T50    53.080   -1.392   51.688
Peak    1.000   48.884   49.884
 
 
====== 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      -1.601    -0.193      0.190       -           -               -         1.10e-03     -1.34e-04          1.32e-04      54.030   57
CPL     -0.744    -0.797      0.995       66.631     -16.871       207.446      3.23e-03     -2.01e-03          8.02e-03      50.620   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      -0.925     -0.435     0.496       -           -               -         4.48e-03     -1.22e-03          1.17e-03      52.790   57
CPL     -0.640     -5.347     2.392      285.020      N/A           N/A         5.93e-03        N/A               N/A         52.720   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   1.20e-07  2.07e-07  2.73e-07  7.32e-07  7.97e-07  1.33e-06   erg/cm2
      90%_error_low -2.10e-08 -2.39e-08 -4.30e-08 -2.12e-07 -1.03e-07 -2.56e-07   erg/cm2
      90%_error_hi   2.17e-08  2.39e-08  4.31e-08  2.63e-07  1.04e-07  2.96e-07   erg/cm2
Peak flux       PL   1.07e-01  1.51e-01  1.59e-01  3.10e-01  5.14e-01  7.27e-01   ph/cm2/s
      90%_error_low -5.43e-02 -5.39e-02 -4.04e-02 -1.42e-01 -1.36e-01 -1.86e-01   ph/cm2/s
      90%_error_hi   6.76e-02  5.24e-02  4.00e-02  2.15e-01  1.38e-01  1.99e-01   ph/cm2/s
 
Fluence        CPL   1.08e-07  2.29e-07  2.75e-07  2.10e-07  7.36e-07  8.23e-07   erg/cm2
      90%_error_low -2.40e-08 -3.16e-08 -5.07e-08 -1.40e-07 -1.15e-07 -1.83e-07   erg/cm2
      90%_error_hi   2.43e-08  3.32e-08  4.87e-08  4.48e-07  1.19e-07  4.49e-07   erg/cm2
Peak flux      CPL   9.81e-02  1.53e-01  1.65e-01  2.35e-01  5.08e-01  6.51e-01   ph/cm2/s
      90%_error_low -6.80e-02 -5.60e-02 -4.54e-02 -2.35e-01 -1.42e-01 -2.55e-01   ph/cm2/s
      90%_error_hi   7.46e-02  5.72e-02  5.47e-02  2.75e-01  1.35e-01  2.55e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  252.0934   -59.2312   0.0148    21.6389   -85.3326         1.1939158     13.065 TRIG_00172516                 
 
Foreground time interval of the image:
 -6.699  66.588 (delta_t =  73.287 [sec])
Background time interval of the image:

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  -10.724 sec. to   66.588 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60101     ( -0.193252   0.190176 )
Norm@50keV  : 1.10267E-03    ( -0.000133737   0.000132449 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.03 using 59 PHA bins.
# Reduced chi-squared =         0.9478 for     57 degrees of freedom 
# Null hypothesis probability =   5.873565e-01
 
Photon flux (15-150 keV)    in 77.31 sec: 0.141747 ( -0.016278  0.016293 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.97252e-07 ( -1.03066e-07  1.04498e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -10.724 sec. to   66.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.744115     ( -0.797401   0.995236 )
Epeak [keV] : 66.6309      ( -16.8712 207.446 )
Norm@50keV  : 3.23063E-03    ( -0.00201396   0.00802189 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.62 using 59 PHA bins.
# Reduced chi-squared =         0.9040 for     56 degrees of freedom 
# Null hypothesis probability =   6.778655e-01
 
Photon flux (15-150 keV)    in 77.31 sec: 0.137320 ( -0.016815  0.016816 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.3564e-07 ( -1.15064e-07  1.18729e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   48.884 sec. to   49.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.924911     ( -0.435058   0.496107 )
Norm@50keV  : 4.47845E-03    ( -0.00121695   0.00116829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.79 using 59 PHA bins.
# Reduced chi-squared =         0.9262 for     57 degrees of freedom 
# Null hypothesis probability =   6.335233e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.514200 ( -0.136261  0.138383 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.97875e-08 ( -1.26579e-08  1.27111e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   48.884 sec. to   49.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.27158     ( -3.71573   4.02382 )
Epeak [keV] : 87.1747      (   )
Norm@50keV  : 3.19599E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.53 using 59 PHA bins.
# Reduced chi-squared =         0.9381 for     56 degrees of freedom 
# Null hypothesis probability =   6.068382e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.508013 ( -0.141845  0.134904 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.9221e-08 ( -1.36317e-08  1.29746e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 71.056 sec.
Hardness ratio (energy fluence ratio) = 1.31862047152

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

S(15-50 keV)  = 3.264503e-07
S(50-150 keV) = 4.708054e-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 = 3.228097461367669E-02, IMY = 3.953973773191242E-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:
 

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

Time interval of the image:
-6.699410 66.588000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.1744 -60.6334    1.7  19.3  135.0   0.5821   7.0    4.2	Cen X-3                       
186.7983 -62.7850    3.8  13.5  155.6   0.2406   3.0    4.0	GX 301-2                      
264.8471 -44.6307    0.0  38.2  -84.3   0.1317   0.5   11.7	4U 1735-44                    
184.7788 -18.1353    2.4  57.2  175.7   2.3948   4.7 ------	UNKNOWN                       
244.8611 -78.3747    2.8   9.6  -21.8   0.3278   4.1 ------	UNKNOWN                       
252.0934 -59.2312    0.9  21.6  -85.3   1.1940  13.1 ------	UNKNOWN                       
200.8032 -14.8401    2.6  59.1 -166.0   2.3636   4.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
-299.000000 303.111500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.1877 -60.6206    1.4  19.3  135.0   2.4836   8.2    3.8	Cen X-3                       
186.6569 -62.7711    2.2  13.6  155.4   1.4954   5.2    0.1	GX 301-2                      
264.9542 -44.3407    0.0  38.4  -84.3   0.2494   0.2   11.2	4U 1735-44                    
187.2481 -22.1066    2.5  53.0  177.8   4.3337   4.6 ------	UNKNOWN                       
269.0361 -66.4643    2.5  20.6  -56.0   1.3764   4.5 ------	UNKNOWN                       
200.6542 -14.8597    3.7  59.1 -166.1   6.6154   3.1 ------	UNKNOWN                       
337.7216 -42.2908    3.1  58.9  -19.1   8.3092   3.7 ------	UNKNOWN                       
241.5919 -33.0349    3.2  43.8 -116.0   4.7808   3.6 ------	UNKNOWN