Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 16:22:13 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger209755
======================================================================

  Trigger: 00209755      Segment: 000

  BAT Trigger Time: 169168401.92   [s; MET]
      Trigger Stop: 169168406.016   [s; MET]
               UTC: 2006-05-12T23:13:20.730480    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 195.772493538686   Dec: 41.2119095233357  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.39
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6619037896906  [ if not an image trigger ]
     Image S/N Ratio:    9.39

  Analysis Position:   [ source = BAT ]
    RA: 195.772493538686   Dec: 41.2119095233357  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 195.74466572331   Dec: 41.2162433904809  [deg; J2000]  
        { 13h 02m 58.7s , +41d 12' 58.5" }
         +/- 1.89834321082287 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.761239728922444 [arcmin] (formal 1-sigma fit error)
    SNR: 12.1741931945871
 
  Angular difference between the analysis and refined position is 1.282648 arcmin
 
  Partial Coding Fraction: 0.4179688    [ including projection effects ]

  Duration
     T90: 8.40000000596046 +/- 1.72774533861967
        Measured from: -3.79199999570847
                   to: 4.608000010252     [s; relative to TRIGTIME]
     T50: 4.24399998784065 +/- 1.31162188173922
        Measured from: -0.931999981403351
                   to: 3.3120000064373     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.28000000119209     
                   to: 4.28000000119209     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.36399999260902     
                   to: 4.92400002479553     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.192125   0.191843   0.066241   0.010457
           0.022848   0.023116   0.019116   0.016679 [error]
 Peak      0.041784   0.043158   0.007506  -0.007659
           0.007680   0.007687   0.006316   0.005403 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    9.288   -4.364    4.924
T90     8.400   -3.792    4.608
T50     4.244   -0.932    3.312
Peak    1.000    3.280    4.280
 
 
====== 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      -2.364    -0.309      0.278       -           -               -         2.57e-03     -5.65e-04          5.53e-04      35.710   57
CPL     -1.577    -0.430      2.151       19.039      N/A           N/A         8.18e-03        N/A               N/A         34.830   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      -2.757     -0.565     0.449       -           -               -         3.82e-03     -1.56e-03          1.61e-03      65.150   57
CPL     -0.283     -1.994     6.706       22.633      N/A           N/A         1.70e-01        N/A               N/A         62.070   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   6.91e-08  7.54e-08  5.85e-08  7.47e-08  2.31e-07  2.78e-07   erg/cm2
      90%_error_low -1.22e-08 -1.17e-08 -1.68e-08 -3.41e-08 -3.98e-08 -6.00e-08   erg/cm2
      90%_error_hi   1.24e-08  1.15e-08  1.80e-08  4.97e-08  4.12e-08  7.13e-08   erg/cm2
Peak flux       PL   5.34e-01  2.59e-01  7.65e-02  2.86e-02  8.85e-01  8.97e-01   ph/cm2/s
      90%_error_low -1.34e-01 -7.14e-02 -3.72e-02 -2.86e-02 -1.97e-01 -2.01e-01   ph/cm2/s
      90%_error_hi   1.37e-01  6.84e-02  4.44e-02  3.54e-02  1.97e-01  2.02e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -1.22e-08 -1.17e-08 -1.68e-08 -3.41e-08 -3.98e-08 -6.00e-08   erg/cm2
      90%_error_hi   1.24e-08  1.15e-08  1.80e-08  4.97e-08  4.12e-08  7.13e-08   erg/cm2
Peak flux      CPL   4.91e-01  3.33e-01  3.89e-02  3.55e-04  8.63e-01  8.63e-01   ph/cm2/s
      90%_error_low -1.63e-01     N/A   -3.89e-02     N/A   -1.95e-01 -1.95e-01   ph/cm2/s
      90%_error_hi   1.52e-01     N/A    6.23e-02     N/A    1.95e-01  1.95e-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
  195.7447    41.2162   0.0157    35.4073   148.6841         0.5270594     12.174 TRIG_00209755                 
 
Foreground time interval of the image:
 -4.364   4.924 (delta_t =   9.288 [sec])
Background time interval of the image:
-239.920  -4.364 (delta_t = 235.556 [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   -4.364 sec. to    4.924 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.36426     ( -0.309344   0.277675 )
Norm@50keV  : 2.56877E-03    ( -0.000565093   0.000552893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.71 using 59 PHA bins.
# Reduced chi-squared =         0.6264 for     57 degrees of freedom 
# Null hypothesis probability =   9.878372e-01
 
Photon flux (15-150 keV)    in 9.288 sec: 0.465591 ( -0.065307  0.065306 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.30968e-07 ( -3.97533e-08  4.11902e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.364 sec. to    4.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.5769     ( -0.432638   2.14829 )
Epeak [keV] : 19.0393      (   )
Norm@50keV  : 8.18313E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          34.83 using 59 PHA bins.
# Reduced chi-squared =         0.6220 for     56 degrees of freedom 
# Null hypothesis probability =   9.881827e-01
 
Photon flux (15-150 keV)    in 9.288 sec: 0.455601 ( -0.067312  0.065962 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    3.280 sec. to    4.280 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.75675     ( -0.565379   0.448301 )
Norm@50keV  : 3.81790E-03    ( -0.00155904   0.00161341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.15 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     57 degrees of freedom 
# Null hypothesis probability =   2.144270e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.885244 ( -0.196576  0.196856 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.14687e-08 ( -1.12476e-08  1.20863e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    3.280 sec. to    4.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.283186     ( -2.02596   6.6737 )
Epeak [keV] : 22.6325      (   )
Norm@50keV  : 0.170062    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.07 using 59 PHA bins.
# Reduced chi-squared =          1.108 for     56 degrees of freedom 
# Null hypothesis probability =   2.689086e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.863206 ( -0.195077  0.194994 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 8.4 sec.
Hardness ratio (energy fluence ratio) = 0.776908746446

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

    S(15-50 keV)  = 1.4443529e-07
S(50-150 keV) = 8.653405e-08

    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 = -6.072943344518483E-01, IMY = -3.694722893306812E-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:
-239.920000 -4.364000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3446  35.3866    4.2  32.2   60.8   0.7082   2.7    6.1	Her X-1                       
299.5974  35.2055    0.5  45.7    4.6   6.9751  23.6    0.4	Cyg X-1                       
308.0374  40.9002    2.8  44.1   -7.6   1.0773   4.1    4.6	Cyg X-3                       
326.3186  38.5034    0.0  53.4  -22.1   0.2777   0.7   12.9	Cyg X-2                       
290.5606  29.3326    2.5  47.6   17.5   1.9005   4.6 ------	UNKNOWN                       
247.8511  55.0912    2.2  12.0   62.2   0.7810   5.3 ------	UNKNOWN                       
240.2368  80.6440    2.3  14.0  -99.0   0.7041   4.9 ------	UNKNOWN

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

    Time interval of the image:
-4.364000 4.924000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2620  35.3086   10.2  32.3   60.9  -0.0560  -1.1    9.8	Her X-1                       
299.6543  35.3107  275.3  45.7    4.4   0.0022   0.0    7.3	Cyg X-1                       
308.0936  40.7801    5.5  44.2   -7.6  -0.0871  -2.1   10.4	Cyg X-3                       
326.3144  38.4631   12.4  53.4  -22.1  -0.0712  -0.9   10.8	Cyg X-2                       
274.9401  27.0641    2.6  44.7   36.5   0.3254   4.5 ------	UNKNOWN                       
221.0411  36.7763    2.3  32.0  112.6   0.2392   5.0 ------	UNKNOWN                       
195.7428  41.2161    0.9  35.4  148.7   0.5309  12.3 ------	UNKNOWN                       
324.5757  49.7657    2.2  43.2  -28.8   0.2282   5.2 ------	UNKNOWN                       
135.9494  40.2726    2.7  59.0 -157.8   0.7193   4.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
90.980600 447.280600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2626  35.2671   10.6  45.5   22.7   0.4862   1.1   10.6	Her X-1                       
265.6578  52.0320    3.5  47.3   -3.0   1.4144   3.3 ------	UNKNOWN                       
158.6548  52.5803    2.3  27.4 -107.8   1.1744   4.9 ------	UNKNOWN