Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Oct  4 20:43:27 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger611933
======================================================================

  Trigger: 00611933      Segment: 000

  BAT Trigger Time: 431798841.344   [s; MET]
      Trigger Stop: 431798842.368   [s; MET]
               UTC: 2014-09-07T16:07:08.847220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 48.1471898036904   Dec: 46.5950777481444  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.32
     Image Trigger?:     NO
     Rate S/N Ratio:     8.66025403784439  [ if not an image trigger ]
     Image S/N Ratio:    7.32

  Analysis Position:   [ source = BAT ]
    RA: 48.1471898036904   Dec: 46.5950777481444  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 48.1307777652394   Dec: 46.5969596111044  [deg; J2000]  
        { 03h 12m 31.4s , +46d 35' 49.1" }
         +/- 1.27286921916771 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.366429682612389 [arcmin] (formal 1-sigma fit error)
    SNR: 21.5490068604448
 
  Angular difference between the analysis and refined position is 0.685996 arcmin
 
  Partial Coding Fraction: 0.65625    [ including projection effects ]

  Duration
     T90: 80 +/- 35.7770876399966
        Measured from: -63.3439999818802
                   to: 16.6560000181198     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: 0.656000018119812
                   to: 16.6560000181198     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.15600001811981     
                   to: 9.15600001811981     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -95.3439999818802     
                   to: 48.6560000181198     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.014879   2.746206   1.932812   0.480167
           0.081574   0.085266   0.075033   0.064631 [error]
 Peak      0.041944   0.064708   0.065445   0.006884
           0.007739   0.008233   0.007629   0.006162 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  144.000  -95.344   48.656
T90    80.000  -63.344   16.656
T50    16.000    0.656   16.656
Peak    1.000    8.156    9.156
 
 
====== 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      -1.650    -0.070      0.070       -           -               -         3.37e-03     -1.29e-04          1.29e-04      39.050   57
CPL     -1.422    -0.255      0.290      129.600     -45.759      -129.600      4.36e-03     -1.05e-03          1.64e-03      37.010   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      -1.325     -0.213     0.213       -           -               -         1.31e-02     -1.66e-03          1.66e-03      59.410   57
CPL     -0.539     -0.852     1.074      100.152     -31.066      -100.152      3.08e-02     -1.83e-02          6.35e-02      57.020   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   7.14e-07  1.20e-06  1.52e-06  3.89e-06  4.51e-06  7.33e-06   erg/cm2
      90%_error_low -4.86e-08 -4.84e-08 -7.64e-08 -4.13e-07 -1.82e-07 -4.69e-07   erg/cm2
      90%_error_hi   4.97e-08  4.82e-08  7.62e-08  4.46e-07  1.82e-07  4.93e-07   erg/cm2
Peak flux       PL   4.56e-01  5.09e-01  4.06e-01  5.38e-01  1.57e+00  1.91e+00   ph/cm2/s
      90%_error_low -1.01e-01 -7.31e-02 -6.12e-02 -1.50e-01 -2.04e-01 -2.48e-01   ph/cm2/s
      90%_error_hi   1.08e-01  7.21e-02  6.04e-02  1.81e-01  2.05e-01  2.50e-01   ph/cm2/s
 
Fluence        CPL   6.82e-07  1.22e-06  1.55e-06  2.79e-06  4.44e-06  6.24e-06   erg/cm2
      90%_error_low -6.03e-08 -5.53e-08 -8.15e-08 -8.77e-07 -2.05e-07 -8.97e-07   erg/cm2
      90%_error_hi   6.14e-08  5.60e-08  8.24e-08  1.23e-06  2.04e-07  1.23e-06   erg/cm2
Peak flux      CPL   3.82e-01  5.38e-01  4.41e-01  2.65e-01  1.52e+00  1.63e+00   ph/cm2/s
      90%_error_low -1.25e-01 -8.29e-02 -7.30e-02 -1.41e-01 -2.13e-01 -2.67e-01   ph/cm2/s
      90%_error_hi   1.33e-01  8.53e-02  7.56e-02  3.31e-01  2.12e-01  3.73e-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
       48.1308    46.5970   0.0089    36.8949  -161.2651         3.8271016     21.549 TRIG_00611933                 
     
    Foreground time interval of the image:
    -95.344  12.757 (delta_t = 108.101 [sec])
    Background time interval of the image:
    -239.344 -95.344 (delta_t = 144.000 [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  -95.344 sec. to   48.656 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.65033     ( -0.0702703   0.0699237 )
    Norm@50keV  : 3.37030E-03    ( -0.000129108   0.000128759 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          39.05 using 59 PHA bins.
    # Reduced chi-squared =         0.6851 for     57 degrees of freedom 
    # Null hypothesis probability =   9.667498e-01
     
    Photon flux (15-150 keV)    in 144 sec: 0.440143 ( -0.017715  0.017763 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 4.51421e-06 ( -1.81673e-07  1.82051e-07 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from  -95.344 sec. to   48.656 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.42189     ( -0.255302   0.290071 )
    Epeak [keV] : 129.600      ( -45.7595 -129.601 )
    Norm@50keV  : 4.36149E-03    ( -0.00104961   0.00164133 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          37.01 using 59 PHA bins.
    # Reduced chi-squared =         0.6610 for     56 degrees of freedom 
    # Null hypothesis probability =   9.764055e-01
     
    Photon flux (15-150 keV)    in 144 sec: 0.433583 ( -0.019272  0.019324 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 4.4356e-06 ( -2.05095e-07  2.04124e-07 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from    8.156 sec. to    9.156 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.32474     ( -0.212526   0.212822 )
    Norm@50keV  : 1.30955E-02    ( -0.00166156   0.00165896 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          59.41 using 59 PHA bins.
    # Reduced chi-squared =          1.042 for     57 degrees of freedom 
    # Null hypothesis probability =   3.880181e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.56969 ( -0.20404  0.20455 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.28659e-07 ( -1.78666e-08  1.80106e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from    8.156 sec. to    9.156 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -0.538887     ( -0.852047   1.07448 )
    Epeak [keV] : 100.152      ( -31.066 -100.152 )
    Norm@50keV  : 3.08472E-02    ( -0.0182766   0.0634647 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          57.02 using 59 PHA bins.
    # Reduced chi-squared =          1.018 for     56 degrees of freedom 
    # Null hypothesis probability =   4.371034e-01
     
    Photon flux (15-150 keV)    in 1 sec: 1.52007 ( -0.21273  0.21205 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 1.23572e-07 ( -1.89676e-08  1.90347e-08 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 80.0 sec.
    Hardness ratio (energy fluence ratio) = 1.27429545154
    

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

    S(15-50 keV)  = 1.9102932e-06
    S(50-150 keV) = 2.603876e-06
    

    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 = -7.109073642563704E-01, IMY = 2.411111187205032E-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:
    -239.344000 -95.344000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    358.7980  16.9125    2.7  40.9  113.8   2.2430   4.3 ------	UNKNOWN                       
     29.5743 -21.5171    3.0  33.5   28.2   0.6824   3.8 ------	UNKNOWN                       
     43.2811  57.4362    3.1  47.2 -168.0   1.0053   3.7 ------	UNKNOWN                       
     53.5895  21.6029    2.8  17.0 -123.5   0.5598   4.2 ------	UNKNOWN                       
     81.5929  41.9568    2.4  47.9 -128.9   3.0697   4.9 ------	UNKNOWN                       
    

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

    Time interval of the image:
    -95.344000 12.756600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     48.1308  46.5970    0.5  36.9 -161.3   3.8275  21.6 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    72.156620 519.756600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
     83.6328  22.0234    0.3  37.7  -36.4  18.6209  35.7    0.5	Crab                          
      2.9568  27.0550    4.4  40.4  102.5   4.4690   2.6 ------	UNKNOWN                       
     58.9305   2.2872    2.3  45.3   10.0   3.2380   5.1 ------	UNKNOWN                       
    337.3386  68.2832    3.8  40.7  172.8   1.8277   3.0 ------	UNKNOWN                       
    261.7502  73.7079    2.3  57.5 -165.4   8.9627   5.1 ------	UNKNOWN                       
    142.6123  71.0267    2.4  48.0 -128.9   7.2069   4.8 ------	UNKNOWN