Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 05:30:04 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger296805
======================================================================

  Trigger: 00296805      Segment: 000

  BAT Trigger Time: 217003809.28   [s; MET]
      Trigger Stop: 217003810.304   [s; MET]
               UTC: 2007-11-17T14:50:06.911640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 335.020304401352   Dec: -63.4411756875453  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    25.57
     Image Trigger?:     NO
     Rate S/N Ratio:     152.613891897166  [ if not an image trigger ]
     Image S/N Ratio:    25.57

  Analysis Position:   [ source = BAT ]
    RA: 335.020304401352   Dec: -63.4411756875453  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 335.025668133934   Dec: -63.442203128655  [deg; J2000]  
        { 22h 20m 06.2s , -63d 26' 31.9" }
         +/- 0.700197995943178 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.177234995796319 [arcmin] (formal 1-sigma fit error)
    SNR: 50.6094283965341
 
  Angular difference between the analysis and refined position is 0.156540 arcmin
 
  Partial Coding Fraction: 0.53125    [ including projection effects ]

  Duration
     T90: 6.07600000500679 +/- 2.14872985913844
        Measured from: -0.203999996185303
                   to: 5.87200000882149     [s; relative to TRIGTIME]
     T50: 1.72400000691414 +/- 0.11986659574832
        Measured from: 0.400000005960464
                   to: 2.1240000128746     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0200000107288361     
                   to: 1.02000001072884     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.439999997615814     
                   to: 13.8840000033379     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.903487   1.363095   1.109023   0.297271
           0.031112   0.033836   0.030673   0.024507 [error]
 Peak      0.194130   0.465865   0.533625   0.155147
           0.010782   0.013958   0.014608   0.009921 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   14.324   -0.440   13.884
T90     6.076   -0.204    5.872
T50     1.724    0.400    2.124
Peak    1.000    0.020    1.020
 
 
====== 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: CPL)
 
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      -1.516    -0.055      0.055       -           -               -         1.82e-02     -5.42e-04          5.42e-04      53.440   57
CPL     -1.196    -0.215      0.226      136.625     -35.004       153.342      2.57e-02     -5.13e-03          6.79e-03      46.790   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      -1.004     -0.052     0.053       -           -               -         9.78e-02     -3.21e-03          3.21e-03      82.330   57
CPL     -0.314     -0.230     0.242      143.397     -22.606        41.657      1.97e-01     -3.99e-02          5.27e-02      53.380   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   3.38e-07  6.15e-07  8.60e-07  2.52e-06  2.47e-06  4.33e-06   erg/cm2
      90%_error_low -1.94e-08 -2.09e-08 -3.16e-08 -2.01e-07 -7.73e-08 -2.21e-07   erg/cm2
      90%_error_hi   1.98e-08  2.09e-08  3.15e-08  2.13e-07  7.74e-08  2.30e-07   erg/cm2
Peak flux       PL   8.06e-04  8.52e-03  1.12e-01  9.91e+00  4.18e-01  9.82e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
Fluence        CPL   3.14e-07  6.28e-07  8.84e-07  1.66e-06  2.42e-06  3.49e-06   erg/cm2
      90%_error_low -2.45e-08 -2.30e-08 -3.56e-08 -3.83e-07 -8.44e-08 -3.88e-07   erg/cm2
      90%_error_hi   2.49e-08  2.31e-08  3.59e-08  5.23e-07  8.40e-08  5.22e-07   erg/cm2
Peak flux      CPL   2.09e+00  3.53e+00  9.61e-05  1.11e+00  2.02e-04  1.12e+00   ph/cm2/s
      90%_error_low -1.99e-01 -1.54e-01     N/A   -1.11e+00     N/A       N/A     ph/cm2/s
      90%_error_hi   2.04e-01  1.55e-01     N/A    -4.84e-01     N/A       N/A     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
  335.0257   -63.4422   0.0038    39.4005   -25.0701         3.7955244     50.609 TRIG_00296805                 
 
Foreground time interval of the image:
 -0.440  13.884 (delta_t =  14.324 [sec])
Background time interval of the image:
-239.280  -0.440 (delta_t = 238.840 [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   -0.440 sec. to   13.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51625     ( -0.0545532   0.0545142 )
Norm@50keV  : 1.82115E-02    ( -0.000542311   0.000542269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.44 using 59 PHA bins.
# Reduced chi-squared =         0.9375 for     57 degrees of freedom 
# Null hypothesis probability =   6.095474e-01
 
Photon flux (15-150 keV)    in 14.32 sec: 2.28365 ( -0.07457  0.07477 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.46788e-06 ( -7.73566e-08  7.74436e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.440 sec. to   13.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19556     ( -0.214879   0.225838 )
Epeak [keV] : 136.625      ( -35.0038 153.342 )
Norm@50keV  : 2.56520E-02    ( -0.005134   0.00679332 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.79 using 59 PHA bins.
# Reduced chi-squared =         0.8355 for     56 degrees of freedom 
# Null hypothesis probability =   8.048790e-01
 
Photon flux (15-150 keV)    in 14.32 sec: 2.23520 ( -0.08053  0.08081 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.41965e-06 ( -8.43485e-08  8.39961e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.020 sec. to    1.020 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.00389     ( -0.0520721   0.0525137 )
Norm@50keV  : 9.77956E-02    ( -0.00321003   0.00320571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          82.33 using 59 PHA bins.
# Reduced chi-squared =          1.444 for     57 degrees of freedom 
# Null hypothesis probability =   1.573321e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.418499 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.05616e-06 ( -3.58785e-08  3.59339e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.020 sec. to    1.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.313757     ( -0.229815   0.242363 )
Epeak [keV] : 143.397      ( -22.6061 41.657 )
Norm@50keV  : 0.197149    ( -0.0399291   0.0527351 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.38 using 59 PHA bins.
# Reduced chi-squared =         0.9532 for     56 degrees of freedom 
# Null hypothesis probability =   5.746726e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.01556E-04 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03899e-06 ( -3.73538e-08  3.72274e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 6.076 sec.
Hardness ratio (energy fluence ratio) = 1.40656576265

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

    S(15-50 keV)  = 9.423328e-07
S(50-150 keV) = 1.4772933e-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 = 7.440379484351372E-01, IMY = 3.480602275669307E-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:
-239.280000 -0.440000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4995 -40.6230    2.2  38.1 -176.9   1.2666   5.4    4.3	Vela X-1                      
170.2461 -60.6372    2.3  34.1 -126.7   1.3145   4.9    2.2	Cen X-3                       
186.8072 -62.6123   25.5  37.5 -114.1   0.1868   0.4   10.3	GX 301-2                      
 87.5473 -31.9592    3.0  36.4  116.1   1.5208   3.9 ------	UNKNOWN                       
331.0136 -45.3677    3.5  56.5  -16.4   2.3164   3.3 ------	UNKNOWN                       
171.2657 -35.9414    3.1  55.3 -145.3   4.3966   3.8 ------	UNKNOWN

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

    Time interval of the image:
-0.440000 13.884000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6171 -40.5410    4.8  38.2 -176.8   0.1545   2.4    4.1	Vela X-1                      
170.3675 -60.7549    7.2  34.1 -126.5  -0.1180  -1.6    8.1	Cen X-3                       
186.3199 -62.7068    6.2  37.3 -114.3  -0.1933  -1.9   10.0	GX 301-2                      
 75.7058 -50.7477    3.0  18.3   92.8   0.2236   3.9 ------	UNKNOWN                       
335.0257 -63.4422    0.2  39.4  -25.1   3.7955  50.6 ------	UNKNOWN                       
300.2007 -61.0299    2.2  48.3  -44.8   0.9663   5.3 ------	UNKNOWN                       
262.1498 -69.1993    3.5  42.4  -68.2   0.6213   3.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
484.720580 951.420600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
210.2271  47.4559    2.7  55.6  177.2   5.2219   4.3 ------	UNKNOWN                       
169.5098 -31.1279    2.9  31.7  -15.6   1.1762   4.0 ------	UNKNOWN                       
161.6884 -41.7601    2.8  43.8  -11.7   1.7351   4.1 ------	UNKNOWN                       
212.7500  33.2307    3.0  47.1 -168.0   2.0058   3.9 ------	UNKNOWN                       
190.0953 -49.9774    3.6  50.7  -39.2   3.7844   3.3 ------	UNKNOWN