Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 15:53:56 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger355303
======================================================================

  Trigger: 00355303      Segment: 000

  BAT Trigger Time: 267250968   [s; MET]
      Trigger Stop: 267250976.192   [s; MET]
               UTC: 2009-06-21T04:22:43.155300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 10.9861581404119   Dec: 61.9679004327154  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.8
     Image Trigger?:     NO
     Rate S/N Ratio:     7.28010988928052  [ if not an image trigger ]
     Image S/N Ratio:    7.8

  Analysis Position:   [ source = BAT ]
    RA: 10.9861581404119   Dec: 61.9679004327154  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 10.987544246165   Dec: 61.9386576388914  [deg; J2000]  
        { 00h 43m 57.0s , +61d 56' 19.2" }
         +/- 1.68809163958159 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.622900260053021 [arcmin] (formal 1-sigma fit error)
    SNR: 14.3968315848615
 
  Angular difference between the analysis and refined position is 1.755003 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 219.236000001431 +/- 72.378491614085
        Measured from: -1.53999999165535
                   to: 217.696000009775     [s; relative to TRIGTIME]
     T50: 106.532000005245 +/- 60.6811145451002
        Measured from: 77.2759999930859
                   to: 183.807999998331     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 239.847999989986     
                   to: 240.847999989986     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -31.0480000078678     
                   to: 241.747999995947     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.624493   1.946231   1.309509   0.192701
           0.083837   0.086721   0.076380   0.066600 [error]
 Peak      0.093355   0.118441   0.065568   0.022200
           0.006199   0.006481   0.005541   0.004220 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  272.796  -31.048  241.748
T90   219.236   -1.540  217.696
T50   106.532   77.276  183.808
Peak    1.000  239.848  240.848
 
 
====== 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      -1.674    -0.099      0.098       -           -               -         1.16e-03     -6.51e-05          6.47e-05      70.830   57
CPL     -1.299    -0.372      0.407       90.537     -25.149       901.263      1.80e-03     -6.26e-04          1.08e-03      67.860   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      -1.724     -0.121     0.119       -           -               -         1.72e-02     -1.27e-03          1.26e-03      64.970   57
CPL     -1.640     -0.493     0.458      193.705      N/A           N/A         1.92e-02        N/A               N/A         64.860   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   4.74e-07  7.84e-07  9.83e-07  2.45e-06  2.93e-06  4.69e-06   erg/cm2
      90%_error_low -4.17e-08 -4.22e-08 -7.49e-08 -3.77e-07 -1.75e-07 -4.42e-07   erg/cm2
      90%_error_hi   4.28e-08  4.22e-08  7.50e-08  4.21e-07  1.76e-07  4.77e-07   erg/cm2
Peak flux       PL   8.80e-01  7.76e-01  4.70e-01  4.30e-01  2.31e+00  2.56e+00   ph/cm2/s
      90%_error_low -9.24e-02 -5.23e-02 -4.51e-02 -7.70e-02 -1.54e-01 -1.70e-01   ph/cm2/s
      90%_error_hi   9.47e-02  5.21e-02  4.51e-02  8.69e-02  1.54e-01  1.71e-01   ph/cm2/s
 
Fluence        CPL   4.46e-07  8.12e-07  9.95e-07  1.38e-06  2.83e-06  3.64e-06   erg/cm2
      90%_error_low -4.99e-08 -5.06e-08 -7.91e-08 -5.65e-07 -1.99e-07 -6.02e-07   erg/cm2
      90%_error_hi   5.07e-08  5.15e-08  7.98e-08  1.05e-06  2.00e-07  1.06e-06   erg/cm2
Peak flux      CPL   8.71e-01  7.83e-01  4.71e-01  3.80e-01  2.30e+00  2.51e+00   ph/cm2/s
      90%_error_low -1.03e-01 -5.82e-02 -4.59e-02 -1.75e-01 -1.60e-01 -2.44e-01   ph/cm2/s
      90%_error_hi   8.91e-02  6.52e-02  4.66e-02  9.20e-02  1.59e-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
   10.9875    61.9387   0.0133    27.6519   -35.8055         1.6051573     14.397 TRIG_00355303                 
 
Foreground time interval of the image:
-31.048  50.301 (delta_t =  81.349 [sec])
Background time interval of the image:
-239.000 -31.048 (delta_t = 207.952 [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  -31.048 sec. to  241.748 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.67387     ( -0.0988712   0.0976553 )
Norm@50keV  : 1.15642E-03    ( -6.51433e-05   6.47507e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.83 using 59 PHA bins.
# Reduced chi-squared =          1.243 for     57 degrees of freedom 
# Null hypothesis probability =   1.030062e-01
 
Photon flux (15-150 keV)    in 272.8 sec: 0.152216 ( -0.008214  0.008225 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.92774e-06 ( -1.74566e-07  1.75989e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -31.048 sec. to  241.748 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29939     ( -0.371636   0.406776 )
Epeak [keV] : 90.5367      ( -25.1489 901.264 )
Norm@50keV  : 1.80080E-03    ( -0.000625873   0.00108081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.86 using 59 PHA bins.
# Reduced chi-squared =          1.212 for     56 degrees of freedom 
# Null hypothesis probability =   1.331278e-01
 
Photon flux (15-150 keV)    in 272.8 sec: 0.148872 ( -0.008828  0.008832 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.82926e-06 ( -1.9909e-07  2.00051e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  239.848 sec. to  240.848 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72418     ( -0.12098   0.118968 )
Norm@50keV  : 1.72349E-02    ( -0.00126959   0.00125642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.97 using 59 PHA bins.
# Reduced chi-squared =          1.140 for     57 degrees of freedom 
# Null hypothesis probability =   2.187415e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.30877 ( -0.15427  0.15435 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.59316e-07 ( -1.22237e-08  1.23444e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  239.848 sec. to  240.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64003     ( -0.493093   0.458087 )
Epeak [keV] : 193.705      (   )
Norm@50keV  : 1.91734E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.86 using 59 PHA bins.
# Reduced chi-squared =          1.158 for     56 degrees of freedom 
# Null hypothesis probability =   1.951806e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.30055 ( -0.15953  0.15853 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.57914e-07 ( -1.41401e-08  1.34107e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = 4.249211462681622E-01, IMY = 3.065245283774237E-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:
-239.000000 -31.048000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5872  35.1902    1.0  43.2   56.8   7.6772  11.4    0.7	Cyg X-1                       
308.1806  40.8171    9.0  37.9   45.9   0.4348   1.3    8.7	Cyg X-3                       
325.9966  38.3656    5.6  42.1   25.2   0.6642   2.1    8.7	Cyg X-2

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

    Time interval of the image:
-31.048000 50.300590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6188  35.0393    0.0  43.4   56.8  -0.2717  -0.7    9.8	Cyg X-1                       
308.3499  40.9395   12.1  37.8   45.7  -0.1984  -1.0   10.9	Cyg X-3                       
326.1502  38.3125   29.2  42.1   25.0  -0.0802  -0.4    1.1	Cyg X-2                       
211.9308  45.4121    1.9  44.2  157.5   1.3109   6.0 ------	UNKNOWN                       
 10.9875  61.9387    0.8  27.7  -35.8   1.6052  14.4 ------	UNKNOWN                       
 21.4427  42.2899    2.1  48.2  -34.5   1.4186   5.6 ------	UNKNOWN                       
102.4835  65.4538    2.3  36.0 -108.5   0.9990   5.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
101.300590 243.052300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.0197  38.3361    8.8  36.1   72.5   0.3967   1.3    7.2	Cyg X-2                       
303.9098  46.8567    2.2  39.7  101.9   2.5083   5.4 ------	UNKNOWN                       
  3.5399   7.5728    2.5  54.7   11.3   2.9676   4.7  501.3	UNKNOWN                       
 10.9918  61.9355    0.4   0.0    0.3   3.5612  29.5 ------	UNKNOWN