Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 00:45:45 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger315819
======================================================================

  Trigger: 00315819      Segment: 000

  BAT Trigger Time: 236804416.512   [s; MET]
      Trigger Stop: 236804417.536   [s; MET]
               UTC: 2008-07-03T19:00:13.598700    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 101.866687854747   Dec: -63.2222518285121  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.3
     Image Trigger?:     NO
     Rate S/N Ratio:     11.7898261225516  [ if not an image trigger ]
     Image S/N Ratio:    7.3

  Analysis Position:   [ source = BAT ]
    RA: 101.866687854747   Dec: -63.2222518285121  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 101.817890032891   Dec: -63.2157827632776  [deg; J2000]  
        { 06h 47m 16.3s , -63d 12' 56.8" }
         +/- 2.16522293627602 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.08686934545919 [arcmin] (formal 1-sigma fit error)
    SNR: 10.0885540328859
 
  Angular difference between the analysis and refined position is 1.375157 arcmin
 
  Partial Coding Fraction: 0.5390625    [ including projection effects ]

  Duration
     T90: 3.5160000026226 +/- 0.805366966222884
        Measured from: -1.47200000286102
                   to: 2.04399999976158     [s; relative to TRIGTIME]
     T50: 1.66000002622604 +/- 0.504983148947092
        Measured from: -0.719999998807907
                   to: 0.940000027418137     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0439999997615814     
                   to: 1.04399999976158     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.7039999961853     
                   to: 2.20800000429153     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.063412   0.141999   0.091808   0.009345
           0.014623   0.015348   0.013917   0.011617 [error]
 Peak      0.018656   0.048664   0.036362   0.005728
           0.007565   0.007995   0.007281   0.005812 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    3.912   -1.704    2.208
T90     3.516   -1.472    2.044
T50     1.660   -0.720    0.940
Peak    1.000    0.044    1.044
 
 
====== 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      -1.448    -0.223      0.224       -           -               -         5.56e-03     -7.85e-04          7.83e-04      61.990   57
CPL     -0.416    -0.999      1.404       71.513     -20.434       429.551      1.99e-02     -1.99e-02          9.78e-02      58.890   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      -1.256     -0.307     0.322       -           -               -         7.97e-03     -1.58e-03          1.57e-03      71.560   57
CPL     -0.393     -1.010     1.710       92.046     -36.365       -92.046      2.23e-02     -2.23e-02          1.54e-01      70.100   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   2.64e-08  5.02e-08  7.35e-08  2.31e-07  2.08e-07  3.81e-07   erg/cm2
      90%_error_low -5.91e-09 -7.42e-09 -1.28e-08 -7.35e-08 -3.17e-08 -8.60e-08   erg/cm2
      90%_error_hi   6.22e-09  7.35e-09  1.28e-08  9.34e-08  3.20e-08  1.02e-07   erg/cm2
Peak flux       PL   2.60e-01  3.02e-01  2.53e-01  3.58e-01  9.44e-01  1.17e+00   ph/cm2/s
      90%_error_low -8.90e-02 -7.06e-02 -5.56e-02 -1.36e-01 -1.94e-01 -2.35e-01   ph/cm2/s
      90%_error_hi   9.86e-02  6.92e-02  5.51e-02  1.79e-01  1.95e-01  2.37e-01   ph/cm2/s
 
Fluence        CPL   2.33e-08  5.70e-08  7.59e-08  5.60e-08  1.90e-07  2.12e-07   erg/cm2
      90%_error_low -6.65e-09 -1.01e-08 -1.63e-08 -4.25e-08 -3.72e-08 -5.60e-08   erg/cm2
      90%_error_hi   6.93e-09  1.09e-08  1.50e-08  1.61e-07  3.71e-08  1.59e-07   erg/cm2
Peak flux      CPL   2.28e-01  3.34e-01  2.73e-01  1.45e-01  9.26e-01  9.78e-01   ph/cm2/s
      90%_error_low -9.69e-02 -8.46e-02 -6.45e-02 -1.45e-01 -1.95e-01 -2.27e-01   ph/cm2/s
      90%_error_hi   1.08e-01  9.25e-02  6.69e-02  2.98e-01  1.96e-01  3.43e-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
  101.8179   -63.2158   0.0191    38.9834     1.5785         0.2882383     10.089 TRIG_00315819                 
 
Foreground time interval of the image:
 -1.704   2.208 (delta_t =   3.912 [sec])
Background time interval of the image:
-227.611  -1.704 (delta_t = 225.907 [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   -1.704 sec. to    2.208 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44811     ( -0.223006   0.223518 )
Norm@50keV  : 5.55752E-03    ( -0.000785486   0.000782991 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.99 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     57 degrees of freedom 
# Null hypothesis probability =   3.026274e-01
 
Photon flux (15-150 keV)    in 3.912 sec: 0.684575 ( -0.09741  0.09762 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.08147e-07 ( -3.17262e-08  3.20456e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.704 sec. to    2.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.415808     ( -1.00369   1.39964 )
Epeak [keV] : 71.5133      ( -20.2534 429.732 )
Norm@50keV  : 1.99433E-02    ( -0.0201095   0.0976623 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.89 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     56 degrees of freedom 
# Null hypothesis probability =   3.703326e-01
 
Photon flux (15-150 keV)    in 3.912 sec: 0.664201 ( -0.099979  0.099941 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.90489e-07 ( -3.72356e-08  3.70991e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.044 sec. to    1.044 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2565     ( -0.307315   0.322382 )
Norm@50keV  : 7.97299E-03    ( -0.00157563   0.00157349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.56 using 59 PHA bins.
# Reduced chi-squared =          1.255 for     57 degrees of freedom 
# Null hypothesis probability =   9.289216e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.944021 ( -0.194107  0.195219 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.96654e-08 ( -1.66132e-08  1.67397e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.044 sec. to    1.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.392716     ( -1.01426   1.70638 )
Epeak [keV] : 92.0464      ( -36.3388 -92.0203 )
Norm@50keV  : 2.23103E-02    ( -0.02236   0.153784 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.10 using 59 PHA bins.
# Reduced chi-squared =          1.252 for     56 degrees of freedom 
# Null hypothesis probability =   9.739457e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.926303 ( -0.194674  0.196397 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.50119e-08 ( -1.88787e-08  1.83135e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 3.516 sec.
Hardness ratio (energy fluence ratio) = 1.46612186729

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

    S(15-50 keV)  = 7.659958e-08
S(50-150 keV) = 1.3155195e-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 = 8.089964360281273E-01, IMY = -2.229359305045227E-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:
-227.611410 -1.704000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  7.2682 -15.5844    2.4  46.0  139.1   2.9705   4.8 ------	UNKNOWN                       
 23.2523 -34.0071    2.6  24.6  122.1   0.8735   4.4 ------	UNKNOWN                       
 36.0451 -59.5958    2.6  25.1   54.8   0.8903   4.4 ------	UNKNOWN                       
107.2370 -25.5319    2.5  46.8  -54.3   4.0600   4.6 ------	UNKNOWN

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

    Time interval of the image:
-1.704000 2.208000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
101.8179 -63.2158    1.1  39.0    1.6   0.2883  10.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
78.388600 962.571300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7073 -40.5020    8.9  30.2  -33.7   0.7371   1.3    8.7	Vela X-1                      
170.5993 -60.6404    5.0  30.9   26.1   1.2440   2.3    8.4	Cen X-3                       
186.6620 -62.7788    0.3  35.7   37.5  25.3118  36.1    0.5	GX 301-2                      
  6.1423 -47.2621    3.1  51.3  148.8   9.5492   3.8 ------	UNKNOWN                       
 97.0096 -36.9597    6.0  26.4  -99.9   1.3687   2.0 ------	UNKNOWN                       
138.3493 -18.9697    3.5  50.7  -44.5  10.0803   3.4 ------	UNKNOWN                       
 96.9287 -22.2416    6.5  41.1  -98.1   6.6745   1.8 ------	UNKNOWN