Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 16:22:42 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger433160
======================================================================

  Trigger: 00433160      Segment: 000

  BAT Trigger Time: 305148720   [s; MET]
      Trigger Stop: 305148784   [s; MET]
               UTC: 2010-09-02T19:31:53.860200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 48.6459500577974   Dec: 30.9725418949067  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Analysis Position:   [ source = BAT ]
    RA: 48.6459500577974   Dec: 30.9725418949067  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 48.625072523013   Dec: 30.9696182703291  [deg; J2000]  
        { 03h 14m 30.0s , +30d 58' 10.6" }
         +/- 1.29755643064696 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.539213148555257 [arcmin] (formal 1-sigma fit error)
    SNR: 20.9657037666019
 
  Angular difference between the analysis and refined position is 1.088288 arcmin
 
  Partial Coding Fraction: 0.7265625    [ including projection effects ]

  Duration
     T90: 428.827999949455 +/- 47.2738088716741
        Measured from: -35.972000002861
                   to: 392.855999946594     [s; relative to TRIGTIME]
     T50: 75.1559999585152 +/- 13.4249177505554
        Measured from: 138.603999972343
                   to: 213.759999930859     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 207.888000011444     
                   to: 208.888000011444     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -49.4279999732971     
                   to: 409.632000029087     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.407341   2.232833   1.338019   0.161921
           0.118979   0.123421   0.110959   0.101978 [error]
 Peak      0.033816   0.041938   0.032888   0.010653
           0.006152   0.006385   0.005691   0.005080 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  459.060  -49.428  409.632
T90   428.828  -35.972  392.856
T50    75.156  138.604  213.760
Peak    1.000  207.888  208.888
 
 
====== 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      -1.985    -0.134      0.130       -           -               -         7.61e-04     -6.06e-05          5.96e-05      55.420   57
CPL     -1.970    -0.354      0.468       84.772     -84.761       -84.772      7.76e-04     -2.84e-04          6.08e-04      55.420   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      -1.630     -0.294     0.281       -           -               -         7.43e-03     -1.30e-03          1.27e-03      54.320   57
CPL     -1.452     -1.102     1.236      142.678    -142.678      -142.678      9.27e-03     -9.27e-03          3.28e-02      54.230   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   7.05e-07  9.65e-07  9.75e-07  1.79e-06  3.22e-06  4.43e-06   erg/cm2
      90%_error_low -6.91e-08 -6.07e-08 -1.09e-07 -3.79e-07 -2.41e-07 -4.92e-07   erg/cm2
      90%_error_hi   7.09e-08  6.07e-08  1.10e-07  4.46e-07  2.45e-07  5.43e-07   erg/cm2
Peak flux       PL   3.46e-01  3.23e-01  2.09e-01  2.08e-01  9.64e-01  1.09e+00   ph/cm2/s
      90%_error_low -8.36e-02 -5.09e-02 -4.76e-02 -8.16e-02 -1.50e-01 -1.73e-01   ph/cm2/s
      90%_error_hi   8.85e-02  5.06e-02  4.75e-02  1.09e-01  1.50e-01  1.76e-01   ph/cm2/s
 
Fluence        CPL   7.04e-07  9.66e-07  9.74e-07  1.75e-06  3.22e-06  4.39e-06   erg/cm2
      90%_error_low -7.88e-08 -9.79e-08 -1.08e-07 -9.76e-07 -2.86e-07 -1.04e-06   erg/cm2
      90%_error_hi   7.63e-08  7.52e-08  1.10e-07  1.19e-06  2.46e-07  5.61e-07   erg/cm2
Peak flux      CPL   3.38e-01  3.29e-01  2.10e-01  1.62e-01  9.56e-01  1.04e+00   ph/cm2/s
      90%_error_low -9.78e-02 -5.65e-02 -4.89e-02 -1.62e-01 -1.56e-01 -2.14e-01   ph/cm2/s
      90%_error_hi   8.78e-02  6.51e-02  5.07e-02  9.78e-02  1.54e-01  2.16e-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
   48.6251    30.9696   0.0092    20.6896   -76.6603         5.0215982     20.966 TRIG_00433160                 
 
Foreground time interval of the image:
 -3.899 260.301 (delta_t = 264.200 [sec])
Background time interval of the image:




    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  -49.428 sec. to  409.632 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98536     ( -0.133837   0.12974 )
Norm@50keV  : 7.60747E-04    ( -6.06308e-05   5.95991e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.42 using 59 PHA bins.
# Reduced chi-squared =         0.9723 for     57 degrees of freedom 
# Null hypothesis probability =   5.344779e-01
 
Photon flux (15-150 keV)    in 459.1 sec: 0.113359 ( -0.007252  0.007265 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.21905e-06 ( -2.40893e-07  2.44628e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -49.428 sec. to  409.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.97004     ( -0.349328   0.472156 )
Epeak [keV] : 84.7724      ( -104.558 -104.57 )
Norm@50keV  : 7.75649E-04    ( -0.000279933   0.000612456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.42 using 59 PHA bins.
# Reduced chi-squared =         0.9897 for     56 degrees of freedom 
# Null hypothesis probability =   4.967334e-01
 
Photon flux (15-150 keV)    in 459.1 sec: 0.113286 ( -0.007822  0.007635 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.21512e-06 ( -2.8647e-07  2.45608e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  207.888 sec. to  208.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.63038     ( -0.293518   0.280898 )
Norm@50keV  : 7.42688E-03    ( -0.00130443   0.00126941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.32 using 59 PHA bins.
# Reduced chi-squared =         0.9530 for     57 degrees of freedom 
# Null hypothesis probability =   5.762593e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.963622 ( -0.149538  0.149618 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.92245e-08 ( -1.28659e-08  1.32083e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  207.888 sec. to  208.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45212     ( -1.10192   1.2364 )
Epeak [keV] : 142.678      ( -142.665 -142.665 )
Norm@50keV  : 9.26632E-03    ( -0.00926661   0.0328226 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.23 using 59 PHA bins.
# Reduced chi-squared =         0.9685 for     56 degrees of freedom 
# Null hypothesis probability =   5.419891e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.956228 ( -0.156027  0.154202 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.7997e-08 ( -8.19854e-09  1.41629e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 428.828 sec.
Hardness ratio (energy fluence ratio) = 1.01022937396

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

    S(15-50 keV)  = 1.6696512e-06
S(50-150 keV) = 1.5493904e-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 = 8.713579396343785E-02, IMY = 3.674718432211420E-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:

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

    Time interval of the image:
-3.899400 260.300600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1173  38.4044   74.4  53.9  163.2  -0.1835  -0.2    5.6	Cyg X-2                       
 11.5054  40.4861    2.8  22.2 -171.9   0.7640   4.1 ------	UNKNOWN                       
320.8428  56.4945    2.4  58.3 -175.2   6.0551   4.8 ------	UNKNOWN                       
 42.9649  24.8621    3.1  14.5  -60.2   0.6922   3.7 ------	UNKNOWN                       
 48.6251  30.9696    0.6  20.7  -76.7   5.0211  21.0 ------	UNKNOWN                       
341.2657  64.0825    3.3  51.1 -162.5   1.6558   3.5 ------	UNKNOWN                       
356.2604  66.6551    2.8  48.1 -154.6   1.8972   4.1 ------	UNKNOWN                       
 77.4939  18.4142    7.3  47.0  -53.1   2.1932   2.1 ------	UNKNOWN                       
 77.7048  18.4628    7.2  47.2  -53.3   2.6192   2.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
305.500600 963.038100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6323  22.0190    0.3  32.4  -63.3  25.0812  39.9    0.3	Crab                          
 72.4815  -8.8764    3.0  45.9  -14.5   2.5591   3.9 ------	UNKNOWN