Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 06:45:09 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger514767
======================================================================

  Trigger: 00514767      Segment: 000

  BAT Trigger Time: 350785647.424   [s; MET]
      Trigger Stop: 350785648.448   [s; MET]
               UTC: 2012-02-13T00:27:19.539260    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 301.032042264378   Dec: 65.3975709325225  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    13.83
     Image Trigger?:     NO
     Rate S/N Ratio:     25.298221281347  [ if not an image trigger ]
     Image S/N Ratio:    13.83

  Analysis Position:   [ source = BAT ]
    RA: 301.032042264378   Dec: 65.3975709325225  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 300.991469250387   Dec: 65.4133757417132  [deg; J2000]  
        { 20h 03m 58.0s , +65d 24' 48.2" }
         +/- 0.678940279349305 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.171722481704201 [arcmin] (formal 1-sigma fit error)
    SNR: 52.8882244822193
 
  Angular difference between the analysis and refined position is 1.387722 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 41.0279999375343 +/- 12.7763865071505
        Measured from: -3.432000041008
                   to: 37.5959998965263     [s; relative to TRIGTIME]
     T50: 15.391999900341 +/- 1.42056326353137
        Measured from: 2.14800000190735
                   to: 17.5399999022484     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.4439999461174     
                   to: 6.4439999461174     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.31200003623962     
                   to: 74.4599999785423     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.825814   1.558213   0.559263   0.133213
           0.045415   0.045410   0.038542   0.032944 [error]
 Peak      0.090527   0.081388   0.035815   0.006180
           0.005770   0.005709   0.004581   0.003691 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   80.772   -6.312   74.460
T90    41.028   -3.432   37.596
T50    15.392    2.148   17.540
Peak    1.000    5.444    6.444
 
 
====== 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      -2.372    -0.091      0.089       -           -               -         2.38e-03     -1.28e-04          1.27e-04      64.420   57
CPL     -1.866    -0.147      0.458       10.651      -8.718        14.801      4.64e-03     -1.14e-03          3.85e-03      59.490   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      -2.089     -0.160     0.154       -           -               -         1.11e-02     -1.16e-03          1.14e-03      50.850   57
CPL     -1.994      1.994     1.994        2.673      -1.690        -2.673      1.27e-02        N/A               N/A         50.790   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   5.60e-07  6.08e-07  4.70e-07  5.95e-07  1.86e-06  2.23e-06   erg/cm2
      90%_error_low -3.55e-08 -2.43e-08 -3.57e-08 -8.72e-08 -8.00e-08 -1.26e-07   erg/cm2
      90%_error_hi   3.63e-08  2.43e-08  3.63e-08  9.75e-08  8.05e-08  1.33e-07   erg/cm2
Peak flux       PL   8.09e-01  5.76e-01  2.71e-01  1.79e-01  1.74e+00  1.84e+00   ph/cm2/s
      90%_error_low -9.33e-02 -4.58e-02 -3.73e-02 -4.33e-02 -1.39e-01 -1.46e-01   ph/cm2/s
      90%_error_hi   9.53e-02  4.57e-02  3.79e-02  5.14e-02  1.39e-01  1.46e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -3.55e-08 -2.43e-08 -3.57e-08 -8.72e-08 -8.00e-08 -1.26e-07   erg/cm2
      90%_error_hi   3.63e-08  2.43e-08  3.63e-08  9.75e-08  8.05e-08  1.33e-07   erg/cm2
Peak flux      CPL   8.08e-01  5.78e-01  2.71e-01  1.80e-01  1.74e+00  1.83e+00   ph/cm2/s
      90%_error_low -1.08e-01 -5.79e-02 -3.79e-02 -2.83e-02 -1.39e-01 -1.37e-01   ph/cm2/s
      90%_error_hi   1.01e-01  4.40e-02  3.89e-02  5.98e-02  1.45e-01  1.59e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

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

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
      300.9915    65.4134   0.0036     5.7933   130.7037         2.5913021     52.888 TRIG_00514767                 
     
    Foreground time interval of the image:
     -6.312  12.277 (delta_t =  18.589 [sec])
    Background time interval of the image:
    -239.424  -6.312 (delta_t = 233.112 [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

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -6.312 sec. to   74.460 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.37235     ( -0.0908053   0.088877 )
    Norm@50keV  : 2.37752E-03    ( -0.000127864   0.000126755 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          64.42 using 59 PHA bins.
    # Reduced chi-squared =          1.130 for     57 degrees of freedom 
    # Null hypothesis probability =   2.329849e-01
     
    Photon flux (15-150 keV)    in 80.77 sec: 0.432941 ( -0.018579  0.018659 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.86222e-06 ( -8.00431e-08  8.05472e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -6.312 sec. to   74.460 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.86646     ( -0.146779   0.457726 )
    Epeak [keV] : 10.6514      ( -8.71786 14.8006 )
    Norm@50keV  : 4.64449E-03    ( -0.00113814   0.00384625 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          59.49 using 59 PHA bins.
    # Reduced chi-squared =          1.062 for     56 degrees of freedom 
    # Null hypothesis probability =   3.499159e-01
     
    Photon flux (15-150 keV)    in 80.77 sec: 0.417785 ( -0.021973  0.020462 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from    5.444 sec. to    6.444 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.0889     ( -0.160171   0.153965 )
    Norm@50keV  : 1.11339E-02    ( -0.00116438   0.00114206 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          50.85 using 59 PHA bins.
    # Reduced chi-squared =         0.8921 for     57 degrees of freedom 
    # Null hypothesis probability =   7.037504e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.74226 ( -0.13904  0.13911 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.03357e-07 ( -9.7173e-09  9.87782e-09 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    5.444 sec. to    6.444 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.99371     ( 1.99371   1.99371 )
    Epeak [keV] : 2.67278      ( -1.69161 -2.67438 )
    Norm@50keV  : 1.26772E-02    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          50.79 using 59 PHA bins.
    # Reduced chi-squared =         0.9070 for     56 degrees of freedom 
    # Null hypothesis probability =   6.717626e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.73991 ( -0.13925  0.1452 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 41.028 sec.
    Hardness ratio (energy fluence ratio) = 0.772555995458
    

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

    S(15-50 keV)  = 1.1686165e-06
    S(50-150 keV) = 6.936045e-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 = -6.616570248434049E-02, IMY = -7.691472735699574E-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:
    -239.424000 -6.312000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    254.5093  35.4545    8.1  36.5    0.2   0.3238   1.4    7.2	Her X-1                       
    299.5651  35.2071    0.8  24.8  -72.4   2.9489  14.3    1.3	Cyg X-1                       
    308.0724  40.9445    1.1  20.3  -92.2   2.1085  10.6    1.8	Cyg X-3                       
    326.0378  38.4359    3.7  28.3 -120.7   0.6383   3.1    9.3	Cyg X-2                       
    256.8352  42.3730    3.1  29.9    5.2   0.6749   3.7 ------	UNKNOWN                       
    342.2834  27.2205    2.8  44.9 -130.8   1.8627   4.1 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -6.312000 12.276600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    254.4518  35.1744   64.3  36.7   -0.0  -0.0126  -0.2   10.1	Her X-1                       
    299.5085  35.1274  764.5  24.9  -72.2  -0.0009  -0.0    6.0	Cyg X-1                       
    308.2299  41.1013    9.3  20.1  -92.7   0.0684   1.2   10.4	Cyg X-3                       
    326.0485  38.4617    4.1  28.3 -120.8  -0.1776  -2.8   10.2	Cyg X-2                       
    300.9915  65.4134    0.2   5.8  130.7   2.5914  52.9 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    37.676600 962.648000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    254.4893  35.4049   11.9  40.5    0.3   0.6850   1.0    4.1	Her X-1                       
    299.5857  35.2170    0.8  30.2  -62.9   8.9550  13.7    0.9	Cyg X-1                       
    308.1302  40.9803    0.8  24.7  -78.2   8.3939  14.9    1.9	Cyg X-3                       
    326.0064  38.2893    3.3  30.7 -105.7   2.1401   3.5    8.0	Cyg X-2                       
    261.7763  31.2312    3.1  41.6  -10.8   2.3070   3.7 ------	UNKNOWN                       
    274.7038  14.1014    3.4  54.3  -33.3   7.5217   3.4 ------	UNKNOWN