Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 05:31:53 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger517566
======================================================================

  Trigger: 00517566      Segment: 000

  BAT Trigger Time: 353261196.736   [s; MET]
      Trigger Stop: 353261198.784   [s; MET]
               UTC: 2012-03-12T16:06:28.751080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 251.764016821549   Dec: 23.8567031121096  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.22
     Image Trigger?:     NO
     Rate S/N Ratio:     13.1529464379659  [ if not an image trigger ]
     Image S/N Ratio:    8.22

  Analysis Position:   [ source = BAT ]
    RA: 251.764016821549   Dec: 23.8567031121096  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 251.811719663456   Dec: 23.8822887863147  [deg; J2000]  
        { 16h 47m 14.8s , +23d 52' 56.2" }
         +/- 2.05513130319154 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.21775922322881 [arcmin] (formal 1-sigma fit error)
    SNR: 10.869378251214
 
  Angular difference between the analysis and refined position is 3.034348 arcmin
 
  Partial Coding Fraction: 0.359375    [ including projection effects ]

  Duration
     T90: 14.1559999585152 +/- 4.16517039858964
        Measured from: 0.015999972820282
                   to: 14.1719999313354     [s; relative to TRIGTIME]
     T50: 5.92799991369247 +/- 2.98029862545656
        Measured from: 1.00800001621246
                   to: 6.93599992990494     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.924000024795532     
                   to: 1.92400002479553     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.42400002479553     
                   to: 15.9120000004768     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.280983   0.334448   0.245335   0.083116
           0.046106   0.041706   0.034913   0.029223 [error]
 Peak      0.049700   0.046883   0.026156   0.025234
           0.011461   0.010562   0.009381   0.007130 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   17.336   -1.424   15.912
T90    14.156    0.016   14.172
T50     5.928    1.008    6.936
Peak    1.000    0.924    1.924
 
 
====== 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      -1.712    -0.243      0.237       -           -               -         3.53e-03     -4.95e-04          4.90e-04      53.090   57
CPL     -1.194    -0.721      1.233       78.243     -26.858       -78.243      6.42e-03     -3.13e-03          1.91e-02      52.340   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      -1.874     -0.482     0.434       -           -               -         8.85e-03     -2.40e-03          2.24e-03      51.830   57
CPL     -1.873     -1.075     0.737     9999.310      N/A           N/A         8.85e-03        N/A               N/A         51.830   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   9.55e-08  1.54e-07  1.88e-07  4.52e-07  5.67e-07  8.90e-07   erg/cm2
      90%_error_low -2.10e-08 -2.16e-08 -3.45e-08 -1.54e-07 -8.19e-08 -1.86e-07   erg/cm2
      90%_error_hi   2.24e-08  2.14e-08  3.42e-08  1.98e-07  8.26e-08  2.19e-07   erg/cm2
Peak flux       PL   5.22e-01  4.21e-01  2.30e-01  1.84e-01  1.26e+00  1.36e+00   ph/cm2/s
      90%_error_low -1.85e-01 -9.68e-02 -8.09e-02 -1.03e-01 -2.90e-01 -3.05e-01   ph/cm2/s
      90%_error_hi   2.04e-01  9.59e-02  7.88e-02  1.58e-01  2.91e-01  3.05e-01   ph/cm2/s
 
Fluence        CPL   8.71e-08  1.62e-07  1.95e-07  2.27e-07  5.48e-07  6.70e-07   erg/cm2
      90%_error_low -2.67e-08 -2.60e-08 -3.74e-08 -1.57e-07 -8.97e-08 -1.86e-07   erg/cm2
      90%_error_hi   2.73e-08  2.71e-08  3.87e-08  2.77e-07  9.01e-08  3.02e-07   erg/cm2
Peak flux      CPL   5.01e-01  3.82e-01  2.26e-01  1.61e-01  1.27e+00  1.35e+00   ph/cm2/s
      90%_error_low -2.24e-01 -1.71e-01 -2.26e-01 -6.29e-02 -3.04e-01 -3.01e-01   ph/cm2/s
      90%_error_hi   2.26e-01  1.28e-01  6.14e-02  5.09e-02  2.80e-01  3.09e-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
      251.8117    23.8823   0.0177    41.6293   164.0935         1.0192097     10.869 TRIG_00517566                 
     
    Foreground time interval of the image:
     -1.424  15.912 (delta_t =  17.336 [sec])
    Background time interval of the image:
    -48.835  -1.424 (delta_t =  47.411 [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   -1.424 sec. to   15.912 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.71202     ( -0.24307   0.2368 )
    Norm@50keV  : 3.53416E-03    ( -0.00049511   0.000490044 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          53.09 using 59 PHA bins.
    # Reduced chi-squared =         0.9314 for     57 degrees of freedom 
    # Null hypothesis probability =   6.224441e-01
     
    Photon flux (15-150 keV)    in 17.34 sec: 0.471384 ( -0.066214  0.066567 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 5.66969e-07 ( -8.18942e-08  8.25902e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   -1.424 sec. to   15.912 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.19438     ( -0.721106   1.23344 )
    Epeak [keV] : 78.2431      ( -26.8687 -78.2539 )
    Norm@50keV  : 6.42175E-03    ( -0.00312579   0.0190911 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          52.34 using 59 PHA bins.
    # Reduced chi-squared =         0.9346 for     56 degrees of freedom 
    # Null hypothesis probability =   6.143227e-01
     
    Photon flux (15-150 keV)    in 17.34 sec: 0.458638 ( -0.07124  0.070943 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 5.48201e-07 ( -8.9722e-08  9.01203e-08 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.924 sec. to    1.924 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.87405     ( -0.481605   0.434011 )
    Norm@50keV  : 8.84646E-03    ( -0.00239789   0.00223791 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          51.83 using 59 PHA bins.
    # Reduced chi-squared =         0.9093 for     57 degrees of freedom 
    # Null hypothesis probability =   6.689243e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.25588 ( -0.290099  0.29078 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 8.13392e-08 ( -2.08775e-08  2.12472e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    0.924 sec. to    1.924 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.69987     ( -0.248148   1.5636 )
    Epeak [keV] : 232.927      (   )
    Norm@50keV  : 3.54837E-03    (     )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          51.03 using 59 PHA bins.
    # Reduced chi-squared =         0.9113 for     56 degrees of freedom 
    # Null hypothesis probability =   6.630159e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.26946 ( -0.304182  0.27953 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 14.156 sec.
    Hardness ratio (energy fluence ratio) = 1.22098365375
    

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

    S(15-50 keV)  = 2.4974946e-07
    S(50-150 keV) = 3.17217e-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 = -8.547270635103429E-01, IMY = -2.435805688172751E-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:
    -48.835400 -1.424000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    244.9871 -15.6459    0.6  11.8   88.3   1.5232  20.2    0.6	Sco X-1                       
    254.4374  35.1950    6.3  52.7  168.7  -0.5067  -1.8    8.9	Her X-1                       
    255.9891 -37.8245    1.6  20.4   -5.9   0.5347   7.2    1.2	4U 1700-377                   
    256.3957 -36.5698   10.9  19.2   -6.7   0.0776   1.1    9.0	GX 349+2                      
    262.9212 -24.8869   11.7   9.2  -43.4   0.0689   1.0    9.7	GX 1+4                        
    264.7760 -44.4448  106.6  27.8  -20.3   0.0086   0.1    1.5	4U 1735-44                    
    268.2338  -1.3484    5.1  19.4 -153.2   0.1768   2.3   10.2	SW J1753.5-0127               
    270.2527 -25.0162    4.1  14.4  -64.4   0.2118   2.8    4.1	GX 5-1                        
    270.2201 -25.6700    4.5  14.7  -62.1   0.1996   2.6    6.2	GRS 1758-258                  
    273.8504 -14.0555    6.5  16.4 -108.0   0.1372   1.8    9.1	GX 17+2                       
    275.7568 -30.3907    3.1  21.3  -57.7   0.3149   3.6    8.8	H1820-303                     
    284.8711 -24.8795    4.5  26.9  -77.7   0.2589   2.5    9.3	HT1900.1-2455                 
    288.7432  11.0300    2.9  42.2 -138.6   0.5946   4.0    6.0	GRS 1915+105                  
    263.1570 -33.7480   17.5  17.2  -25.7  -0.0478  -0.7    9.9	GX 354-0                      
    207.6969 -42.6271    2.1  48.8   39.5   1.8412   5.4 ------	UNKNOWN                       
    254.4952 -11.2597    2.2   6.7  148.5   0.3611   5.3 ------	UNKNOWN                       
    263.2763  13.0098    2.4  31.0 -176.9   0.4032   4.8 ------	UNKNOWN                       
    296.2114  17.4575    2.3  51.9 -138.8   1.7667   5.0 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -1.424000 15.912000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    244.9799 -15.6407  195.3  11.8   88.4  -0.0029  -0.1    0.0	Sco X-1                       
    254.5808  35.3642   18.2  52.8  168.8   0.1261   0.6    6.2	Her X-1                       
    256.0225 -38.0001   13.1  20.6   -6.0  -0.0449  -0.9    9.5	4U 1700-377                   
    256.4531 -36.3248    4.6  18.9   -6.8  -0.1262  -2.5    6.0	GX 349+2                      
    262.9890 -24.6914  138.6   9.1  -44.4   0.0039   0.1    3.4	GX 1+4                        
    264.5445 -44.4965   52.1  27.8  -19.9   0.0110   0.2    8.9	4U 1735-44                    
    268.5137  -1.4341    7.3  19.5 -152.4   0.0791   1.6    8.8	SW J1753.5-0127               
    270.1472 -24.9261    4.3  14.2  -64.6  -0.1287  -2.7   11.8	GX 5-1                        
    270.2448 -25.5941    7.4  14.7  -62.4   0.0759   1.5    9.5	GRS 1758-258                  
    273.9153 -14.1733  135.1  16.5 -107.6  -0.0045  -0.1    9.8	GX 17+2                       
    275.8578 -30.3676    5.8  21.4  -57.9  -0.1131  -2.0    3.5	H1820-303                     
    284.8711 -24.8749    5.9  26.9  -77.7  -0.1224  -1.9    9.4	HT1900.1-2455                 
    288.6741  10.9737   18.4  42.1 -138.6  -0.0618  -0.6    7.5	GRS 1915+105                  
    263.0656 -33.8462    5.3  17.3  -25.3   0.0995   2.2    3.9	GX 354-0                      
    250.9318  20.7869    2.1  38.7  162.1   0.4070   5.6 ------	UNKNOWN                       
    251.8117  23.8823    1.1  41.6  164.1   1.0184  10.9 ------	UNKNOWN                       
    270.9243 -37.5952    2.2  23.5  -36.8   0.2647   5.2 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    86.164600 962.327900
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    244.9865 -15.6314    0.4  40.0   12.2  22.8926  30.8    0.7	Sco X-1                       
    254.6352  35.4814    5.2  11.9 -166.5   1.0226   2.2   12.0	Her X-1                       
    263.1198 -24.7307   13.1  49.8  -11.5   0.8459   0.9    6.1	GX 1+4                        
    268.3675  -1.4041    2.3  30.0  -32.8   2.6022   5.1    2.9	SW J1753.5-0127               
    270.2426 -25.1015    2.4  52.1  -19.3   5.2064   4.8    2.6	GX 5-1                        
    270.2628 -25.7720   14.1  52.8  -19.0   0.9738   0.8    2.8	GRS 1758-258                  
    274.0202 -14.0757    6.4  43.7  -30.0   1.5026   1.8    2.5	GX 17+2                       
    275.9998 -30.4972    0.0  59.1  -22.3   3.3797   1.2    8.7	H1820-303                     
    288.7935  10.9233    1.8  37.5  -74.3   9.5734   6.5    1.4	GRS 1915+105                  
    299.5725  35.1706    1.6  42.7 -114.7  14.4988   7.3    2.1	Cyg X-1                       
    219.2397  28.4241    2.8  29.5  108.1   2.9974   4.1 ------	UNKNOWN                       
    255.3276   2.4490    3.0  21.7   -7.6   1.6553   3.8 ------	UNKNOWN                       
    268.4271 -17.8006    2.6  44.7  -20.8   3.3421   4.5 ------	UNKNOWN                       
    313.3614  69.6301    3.6  58.0 -156.8  12.2133   3.2 ------	UNKNOWN