Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 03:53:02 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger554996
======================================================================

  Trigger: 00554996      Segment: 000

  BAT Trigger Time: 389209841.152   [s; MET]
      Trigger Stop: 389209841.216   [s; MET]
               UTC: 2013-05-02T17:50:30.642920    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 138.577789038498   Dec: -0.143261927772071  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.75
     Image Trigger?:     NO
     Rate S/N Ratio:     13.076696830622  [ if not an image trigger ]
     Image S/N Ratio:    7.75

  Analysis Position:   [ source = BAT ]
    RA: 138.577789038498   Dec: -0.143261927772071  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 138.576416102131   Dec: -0.143687216245506  [deg; J2000]  
        { 09h 14m 18.3s , -00d 08' 37.3" }
         +/- 1.89503469948159 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.923253093726447 [arcmin] (formal 1-sigma fit error)
    SNR: 12.2045684545505
 
  Angular difference between the analysis and refined position is 0.086238 arcmin
 
  Partial Coding Fraction: 0.4726562    [ including projection effects ]

  Duration
     T90: 7.567999958992 +/- 4.44984135991245
        Measured from: -0.100000023841858
                   to: 7.46799993515015     [s; relative to TRIGTIME]
     T50: 2.33199995756149 +/- 0.456508505864197
        Measured from: 0.167999982833862
                   to: 2.49999994039536     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.216000020503998     
                   to: 0.783999979496002     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.196000039577484     
                   to: 10.2039999961853     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.243782   0.255007   0.203317   0.020296
           0.031770   0.033184   0.030699   0.031037 [error]
 Peak      0.084963   0.127071   0.105184   0.016687
           0.011129   0.012343   0.011447   0.010026 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   10.400   -0.196   10.204
T90     7.568   -0.100    7.468
T50     2.332    0.168    2.500
Peak    1.000   -0.216    0.784
 
 
====== 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      -1.856    -0.265      0.249       -           -               -         4.50e-03     -7.28e-04          7.05e-04      61.300   57
CPL     -1.736    -0.590      1.109       99.062     -99.047       -99.062      5.24e-03     -5.24e-03          1.58e-02      61.260   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.724     -0.186     0.178       -           -               -         2.16e-02     -2.62e-03          2.58e-03      82.580   57
CPL     -0.648     -0.763     0.901       58.811     -11.442        33.628      8.12e-02     -4.88e-02          1.60e-01      76.460   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   8.36e-08  1.24e-07  1.37e-07  2.85e-07  4.31e-07  6.29e-07   erg/cm2
      90%_error_low -1.67e-08 -1.65e-08 -2.99e-08 -1.09e-07 -6.82e-08 -1.43e-07   erg/cm2
      90%_error_hi   1.74e-08  1.65e-08  3.02e-08  1.47e-07  6.97e-08  1.72e-07   erg/cm2
Peak flux       PL   1.10e+00  9.72e-01  5.89e-01  5.39e-01  2.89e+00  3.20e+00   ph/cm2/s
      90%_error_low -1.77e-01 -1.07e-01 -9.04e-02 -1.45e-01 -3.17e-01 -3.53e-01   ph/cm2/s
      90%_error_hi   1.85e-01  1.07e-01  9.02e-02  1.72e-01  3.18e-01  3.54e-01   ph/cm2/s
 
Fluence        CPL   8.25e-08  1.26e-07  1.37e-07  2.29e-07  4.26e-07  5.74e-07   erg/cm2
      90%_error_low -1.93e-08 -1.81e-08 -2.74e-08 -1.81e-07 -7.79e-08 -2.06e-07   erg/cm2
      90%_error_hi   1.87e-08  2.23e-08  3.11e-08  7.95e-08  7.36e-08  1.02e-07   erg/cm2
Peak flux      CPL   9.47e-01  1.09e+00  6.26e-01  1.86e-01  2.80e+00  2.85e+00   ph/cm2/s
      90%_error_low -2.09e-01 -1.37e-01 -1.07e-01 -1.02e-01 -3.23e-01 -3.43e-01   ph/cm2/s
      90%_error_hi   2.14e-01  1.41e-01  1.07e-01  2.03e-01  3.23e-01  3.62e-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
  138.5764    -0.1437   0.0159    43.2770  -171.5646         0.7365808     12.205 TRIG_00554996                 
 
Foreground time interval of the image:
 -0.196   9.749 (delta_t =   9.945 [sec])
Background time interval of the image:
-239.152  -0.196 (delta_t = 238.956 [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   -0.196 sec. to   10.204 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.85624     ( -0.264642   0.248946 )
Norm@50keV  : 4.50367E-03    ( -0.000728237   0.000705369 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.30 using 59 PHA bins.
# Reduced chi-squared =          1.075 for     57 degrees of freedom 
# Null hypothesis probability =   3.244095e-01
 
Photon flux (15-150 keV)    in 10.4 sec: 0.634686 ( -0.085396  0.085482 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.30709e-07 ( -6.8221e-08  6.97097e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.196 sec. to   10.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.73621     ( -0.589797   1.10896 )
Epeak [keV] : 99.0622      ( -99.2768 -99.2915 )
Norm@50keV  : 5.24359E-03    ( -0.00524051   0.0157673 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.26 using 59 PHA bins.
# Reduced chi-squared =          1.094 for     56 degrees of freedom 
# Null hypothesis probability =   2.929956e-01
 
Photon flux (15-150 keV)    in 10.4 sec: 0.631436 ( -0.089376  0.087885 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.25827e-07 ( -7.78558e-08  7.36015e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.216 sec. to    0.784 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72382     ( -0.1856   0.178161 )
Norm@50keV  : 2.15935E-02    ( -0.00261545   0.00257985 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          82.58 using 59 PHA bins.
# Reduced chi-squared =          1.449 for     57 degrees of freedom 
# Null hypothesis probability =   1.501478e-02
 
Photon flux (15-150 keV)    in 1 sec: 2.89226 ( -0.31738  0.31757 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.99609e-07 ( -2.49665e-08  2.52757e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.216 sec. to    0.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.648154     ( -0.763361   0.900532 )
Epeak [keV] : 58.8106      ( -11.4416 33.6278 )
Norm@50keV  : 8.11765E-02    ( -0.0487548   0.160043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.46 using 59 PHA bins.
# Reduced chi-squared =          1.365 for     56 degrees of freedom 
# Null hypothesis probability =   3.599775e-02
 
Photon flux (15-150 keV)    in 1 sec: 2.80241 ( -0.32285  0.32335 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.86672e-07 ( -2.58446e-08  2.66571e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 7.568 sec.
Hardness ratio (energy fluence ratio) = 1.10481672

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

    S(15-50 keV)  = 2.0742075e-07
S(50-150 keV) = 2.2328809e-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 = -9.314096645177184E-01, IMY = 1.381271159145886E-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:
-239.152000 -0.196000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
182.5164  10.3084    2.9  19.6  103.9   1.0040   4.0 ------	UNKNOWN                       
232.7177  45.5931    2.0  49.8    4.9   2.9460   5.7 ------	UNKNOWN                       
193.3907  43.5903    2.9  22.8   -6.8   0.8384   4.0 ------	UNKNOWN                       
203.1304  62.0693    2.1  39.6  -25.8   1.8004   5.6 ------	UNKNOWN

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

    Time interval of the image:
-0.196000 9.748600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
165.5934 -18.0130    1.9  46.3  142.6   0.9392   6.3 ------	UNKNOWN                       
165.5766  -1.2106    2.1  29.8  147.9   0.2847   5.5 ------	UNKNOWN                       
138.5764  -0.1437    1.0  43.3 -171.6   0.7366  12.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
74.948630 620.748610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4991 -40.6034    4.5  40.6  168.1   1.7848   2.6    3.2	Vela X-1                      
169.0518 -30.0830    2.9  41.7  123.2   6.0111   3.9 ------	UNKNOWN                       
162.8410  22.8983    2.8  33.0   28.6   2.0571   4.2 ------	UNKNOWN                       
128.2206 -49.2475    2.9  49.9  173.3   4.2283   4.0 ------	UNKNOWN                       
 94.2641 -43.6631    4.7  58.7 -159.3   8.0336   2.5 ------	UNKNOWN                       
105.3587  35.4240    3.8  47.1  -53.0   6.5242   3.1 ------	UNKNOWN                       
 92.8254 -18.4173    3.4  48.5 -130.3   7.2044   3.4 ------	UNKNOWN