Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Mar  3 23:44:00 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger583861
======================================================================

  Trigger: 00583861      Segment: 000

  BAT Trigger Time: 411393472   [s; MET]
      Trigger Stop: 411393536   [s; MET]
               UTC: 2014-01-14T11:57:40.482160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 188.482555589256   Dec: 27.9264396826658  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.96
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.96

  Analysis Position:   [ source = BAT ]
    RA: 188.482555589256   Dec: 27.9264396826658  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 188.495258015931   Dec: 27.9396513490374  [deg; J2000]  
        { 12h 33m 58.9s , +27d 56' 22.7" }
         +/- 1.92888653613018 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.830706882341634 [arcmin] (formal 1-sigma fit error)
    SNR: 11.8997381825249
 
  Angular difference between the analysis and refined position is 1.040085 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 139.947999954224 +/- 15.8801637489094
        Measured from: 43.6079999804497
                   to: 183.555999934673     [s; relative to TRIGTIME]
     T50: 52.783999979496 +/- 3.21291203934822
        Measured from: 87.1679999828339
                   to: 139.95199996233     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 115.879999995232     
                   to: 116.879999995232     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 19.444000005722     
                   to: 202.519999980927     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.566649   2.512148   1.161806   0.241156
           0.077727   0.080065   0.069262   0.059073 [error]
 Peak      0.047589   0.044989   0.018141   0.006854
           0.006160   0.006561   0.005504   0.004524 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  183.076   19.444  202.520
T90   139.948   43.608  183.556
T50    52.784   87.168  139.952
Peak    1.000  115.880  116.880
 
 
====== 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      -2.069    -0.088      0.087       -           -               -         1.88e-03     -9.56e-05          9.47e-05      52.750   57
CPL     -1.803    -0.323      0.375       32.467     -27.869        16.263      2.64e-03     -9.01e-04          1.56e-03      51.020   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      -2.069     -0.319     0.287       -           -               -         6.11e-03     -1.36e-03          1.31e-03      44.990   57
CPL     -1.997      1.997     1.997        1.900      -1.584        -1.900      6.75e-03     -6.75e-03          2.17e-03      44.970   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   7.54e-07  9.82e-07  9.35e-07  1.58e-06  3.20e-06  4.25e-06   erg/cm2
      90%_error_low -5.14e-08 -4.11e-08 -6.68e-08 -2.23e-07 -1.49e-07 -2.87e-07   erg/cm2
      90%_error_hi   5.26e-08  4.11e-08  6.74e-08  2.48e-07  1.50e-07  3.05e-07   erg/cm2
Peak flux       PL   4.36e-01  3.14e-01  1.50e-01  1.01e-01  9.47e-01  1.00e+00   ph/cm2/s
      90%_error_low -8.80e-02 -5.00e-02 -4.23e-02 -4.50e-02 -1.46e-01 -1.58e-01   ph/cm2/s
      90%_error_hi   8.98e-02  4.95e-02  4.40e-02  6.29e-02  1.46e-01  1.59e-01   ph/cm2/s
 
Fluence        CPL   7.28e-07  1.01e-06  9.27e-07  9.95e-07  3.10e-06  3.66e-06   erg/cm2
      90%_error_low -6.16e-08 -5.03e-08 -7.17e-08 -4.25e-07 -1.89e-07 -4.81e-07   erg/cm2
      90%_error_hi   6.09e-08  5.17e-08  7.06e-08  8.22e-07  1.91e-07  8.49e-07   erg/cm2
Peak flux      CPL   4.35e-01  3.15e-01  1.51e-01  9.77e-02  9.46e-01  9.98e-01   ph/cm2/s
      90%_error_low -9.31e-02 -5.84e-02 -4.05e-02 -4.21e-02 -1.45e-01 -1.53e-01   ph/cm2/s
      90%_error_hi   9.17e-02  4.82e-02  4.24e-02  4.09e-02  1.48e-01  1.74e-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
      188.4953    27.9397   0.0162     6.9139  -168.0670         1.0168156     11.900 TRIG_00583861                 
     
    Foreground time interval of the image:
     19.444  72.501 (delta_t =  53.057 [sec])
    Background time interval of the image:
    -239.000  19.444 (delta_t = 258.444 [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   19.444 sec. to  202.520 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.06945     ( -0.0883423   0.086729 )
    Norm@50keV  : 1.88467E-03    ( -9.55859e-05   9.46846e-05 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          52.75 using 59 PHA bins.
    # Reduced chi-squared =         0.9254 for     57 degrees of freedom 
    # Null hypothesis probability =   6.352159e-01
     
    Photon flux (15-150 keV)    in 183.1 sec: 0.292139 ( -0.012857  0.012892 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.19793e-06 ( -1.48927e-07  1.50089e-07 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from   19.444 sec. to  202.520 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.80314     ( -0.322864   0.374637 )
    Epeak [keV] : 32.4668      ( -27.8688 16.2626 )
    Norm@50keV  : 2.63543E-03    ( -0.000901434   0.00156172 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          51.02 using 59 PHA bins.
    # Reduced chi-squared =         0.9111 for     56 degrees of freedom 
    # Null hypothesis probability =   6.633397e-01
     
    Photon flux (15-150 keV)    in 183.1 sec: 0.286752 ( -0.014533  0.014554 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 3.10376e-06 ( -1.89236e-07  1.90803e-07 ) ergs/cm2
     
    

    1-s peak spectrum fit

    Power-law model
    Time interval is from  115.880 sec. to  116.880 sec.
     
    Spectral model in power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -2.0689     ( -0.318722   0.287236 )
    Norm@50keV  : 6.11038E-03    ( -0.00135861   0.00131016 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          44.99 using 59 PHA bins.
    # Reduced chi-squared =         0.7894 for     57 degrees of freedom 
    # Null hypothesis probability =   8.751495e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.946903 ( -0.145638  0.145657 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 5.66239e-08 ( -1.11617e-08  1.1599e-08 ) ergs/cm2
     
    
    Cutoff power-law model
    Time interval is from  115.880 sec. to  116.880 sec.
    Spectral model in the cutoff power-law:
    ------------------------------------------------------------
    Parameters  : value       lower 90%   higher 90%
    Photon index: -1.99652     ( 1.99652   1.99652 )
    Epeak [keV] : 1.90035      ( -1.57734 -1.89395 )
    Norm@50keV  : 6.75102E-03    ( -0.00676446   0.00215932 )
    ------------------------------------------------------------
    #Fit statistic : Chi-Squared =          44.97 using 59 PHA bins.
    # Reduced chi-squared =         0.8030 for     56 degrees of freedom 
    # Null hypothesis probability =   8.544708e-01
     
    Photon flux (15-150 keV)    in 1 sec: 0.945855 ( -0.145121  0.147665 ) ph/cm2/s
    Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
     
    

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot

    T90                                   = 139.948 sec.
    Hardness ratio (energy fluence ratio) = 0.95305951144
    

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

    S(15-50 keV)  = 1.7358307e-06
    S(50-150 keV) = 1.4621365e-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 = -1.186397458794859E-01, IMY = 2.507270633167256E-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:
    -239.000000 19.444000
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    202.5169  77.7383    2.7  56.9  179.3   5.7424   4.3 ------	UNKNOWN                       
    202.0581  -3.6541    2.4  29.4  -38.4   1.0416   4.7 ------	UNKNOWN                       
    218.1372  37.5163    2.9  31.9 -132.4   1.2126   4.0 ------	UNKNOWN                       
    222.6316  -3.6942    3.1  43.5  -64.0   4.0705   3.7 ------	UNKNOWN                       
    

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

    Time interval of the image:
    19.444000 72.500590
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    188.4953  27.9396    1.0   6.9 -168.1   1.0169  11.9 ------	UNKNOWN                       
    199.2202   5.7921    2.3  20.0  -45.6   0.4536   5.1 ------	UNKNOWN                       
    218.8644  34.3508    2.1  31.5 -126.3   0.6100   5.4 ------	UNKNOWN                       
    

    Post-slew image of 15-350 keV band

    Time interval of the image:
    100.500600 963.089600
     
    # RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
    #  [deg]    [deg]    ['] [deg]  [deg]                   [']
    185.2684  50.6567    2.6  22.9  163.0   2.1826   4.5 ------	UNKNOWN                       
    174.5320 -27.1631    2.9  56.7    3.1  11.7539   4.0 ------	UNKNOWN                       
    188.5346  27.9736    1.5   0.1 -153.8   3.5823   7.6 ------	UNKNOWN                       
    184.4347  -6.8497    4.2  35.0   -4.8   1.7508   2.8 ------	UNKNOWN                       
    210.8282  23.5389    3.6  20.6  -94.6   1.7161   3.2 ------	UNKNOWN                       
    224.6229  39.4504    2.8  32.0 -132.4   3.1579   4.2 ------	UNKNOWN                       
    206.4708  -4.7740    3.7  37.0  -42.5   2.4703   3.2 ------	UNKNOWN                       
    238.7867  29.4084    2.9  43.8 -116.3  10.5489   4.0 ------	UNKNOWN                       
    236.6337  25.8331    2.7  42.7 -110.6  10.3436   4.5 ------	UNKNOWN                       
    236.4966  25.4514    3.7  42.7 -110.0   8.7700   3.8 ------	UNKNOWN