Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 06:04:21 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger295301
======================================================================

  Trigger: 00295301      Segment: 000

  BAT Trigger Time: 214978136   [s; MET]
      Trigger Stop: 214978200   [s; MET]
               UTC: 2007-10-25T04:08:53.685000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 355.084178674568   Dec: 31.7568181976365  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.87
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.87

  Analysis Position:   [ source = BAT ]
    RA: 355.084178674568   Dec: 31.7568181976365  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 355.066752072327   Dec: 31.7831645527375  [deg; J2000]  
        { 23h 40m 16.0s , +31d 46' 59.4" }
         +/- 1.28732945039301 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.50698646168878 [arcmin] (formal 1-sigma fit error)
    SNR: 21.2040491259932
 
  Angular difference between the analysis and refined position is 1.813580 arcmin
 
  Partial Coding Fraction: 0.4882812    [ including projection effects ]

  Duration
     T90: 241.296000003815 +/- 35.8307999214103
        Measured from: 56.4920000135899
                   to: 297.788000017405     [s; relative to TRIGTIME]
     T50: 53.6599999964237 +/- 3.86351547609288
        Measured from: 82.3000000119209
                   to: 135.960000008345     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 81.9040000140667     
                   to: 82.9040000140667     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 38.5     
                   to: 437.280000001192     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.966958   4.797476   3.100968   0.781263
           0.099217   0.103565   0.091217   0.078893 [error]
 Peak      0.046425   0.087528   0.060900   0.000578
           0.007567   0.008130   0.007084   0.005756 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  398.780   38.500  437.280
T90   241.296   56.492  297.788
T50    53.660   82.300  135.960
Peak    1.000   81.904   82.904
 
 
====== 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      -1.711    -0.057      0.057       -           -               -         1.98e-03     -5.80e-05          5.79e-05      44.350   57
CPL     -1.651    -0.111      0.219      294.964    -294.917      -294.964      2.12e-03     -1.91e-04          5.75e-04      44.120   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      -1.503     -0.184     0.182       -           -               -         1.37e-02     -1.60e-03          1.59e-03      60.540   57
CPL     -0.090     -0.930     1.226       62.511     -11.985        35.551      7.80e-02     -7.80e-02          2.78e-01      53.070   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   1.23e-06  1.99e-06  2.43e-06  5.84e-06  7.32e-06  1.15e-05   erg/cm2
      90%_error_low -6.69e-08 -6.18e-08 -9.55e-08 -5.02e-07 -2.22e-07 -5.63e-07   erg/cm2
      90%_error_hi   6.83e-08  6.16e-08  9.53e-08  5.35e-07  2.23e-07  5.89e-07   erg/cm2
Peak flux       PL   5.65e-01  5.67e-01  4.00e-01  4.49e-01  1.71e+00  1.98e+00   ph/cm2/s
      90%_error_low -1.01e-01 -6.74e-02 -5.78e-02 -1.16e-01 -1.95e-01 -2.28e-01   ph/cm2/s
      90%_error_hi   1.06e-01  6.71e-02  5.76e-02  1.38e-01  1.95e-01  2.30e-01   ph/cm2/s
 
Fluence        CPL   1.22e-06  2.00e-06  2.44e-06  5.32e-06  7.28e-06  1.10e-05   erg/cm2
      90%_error_low -8.43e-08 -6.62e-08 -9.84e-08 -1.46e-06 -2.63e-07 -1.49e-06   erg/cm2
      90%_error_hi   5.92e-08  6.86e-08  9.93e-08  6.36e-07  2.52e-07  7.24e-07   erg/cm2
Peak flux      CPL   4.62e-01  6.56e-01  4.22e-01  1.10e-01  1.63e+00  1.65e+00   ph/cm2/s
      90%_error_low -1.19e-01 -9.06e-02 -7.19e-02 -7.05e-02 -2.03e-01 -2.17e-01   ph/cm2/s
      90%_error_hi   1.23e-01  9.59e-02  6.94e-02  1.52e-01  2.03e-01  2.35e-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
  355.0668    31.7832   0.0091    30.5627   135.8904         1.8792734     21.204 TRIG_00295301                 
 
Foreground time interval of the image:
 38.500  72.301 (delta_t =  33.801 [sec])
Background time interval of the image:
-239.000  38.500 (delta_t = 277.500 [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   38.500 sec. to  437.280 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71097     ( -0.0570967   0.0568698 )
Norm@50keV  : 1.98265E-03    ( -5.80021e-05   5.78583e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.35 using 59 PHA bins.
# Reduced chi-squared =         0.7782 for     57 degrees of freedom 
# Null hypothesis probability =   8.890733e-01
 
Photon flux (15-150 keV)    in 398.8 sec: 0.264347 ( -0.008299  0.008343 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.31571e-06 ( -2.22459e-07  2.2297e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   38.500 sec. to  437.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.6507     ( -0.111391   0.219431 )
Epeak [keV] : 294.964      ( -294.925 -294.971 )
Norm@50keV  : 2.12157E-03    ( -0.000190911   0.00057471 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.12 using 59 PHA bins.
# Reduced chi-squared =         0.7878 for     56 degrees of freedom 
# Null hypothesis probability =   8.747839e-01
 
Photon flux (15-150 keV)    in 398.8 sec: 0.263056 ( -0.009379  0.009235 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.27539e-06 ( -2.6269e-07  2.52014e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   81.904 sec. to   82.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50295     ( -0.184327   0.18239 )
Norm@50keV  : 1.36798E-02    ( -0.00160256   0.00159374 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.54 using 59 PHA bins.
# Reduced chi-squared =          1.062 for     57 degrees of freedom 
# Null hypothesis probability =   3.491751e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.70917 ( -0.19527  0.19549 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2973e-07 ( -1.64587e-08  1.66494e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   81.904 sec. to   82.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.089986     ( -0.9332   1.22353 )
Epeak [keV] : 62.5110      ( -11.9257 35.6109 )
Norm@50keV  : 7.79769E-02    ( -0.0783739   0.277128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.07 using 59 PHA bins.
# Reduced chi-squared =         0.9477 for     56 degrees of freedom 
# Null hypothesis probability =   5.864867e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.62690 ( -0.20321  0.20322 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15136e-07 ( -1.81319e-08  1.90509e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 241.296 sec.
Hardness ratio (energy fluence ratio) = 1.22185598913

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

    S(15-50 keV)  = 3.220427e-06
S(50-150 keV) = 4.095285e-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 = -4.239995634639267E-01, IMY = -4.110225134930077E-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 38.500000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5986  35.1991    0.5  49.7 -155.3   9.7210  21.0    0.4	Cyg X-1                       
308.1451  41.0382    3.6  40.9 -157.7   0.8990   3.2    5.4	Cyg X-3                       
326.1334  38.2899    3.5  34.6 -178.4   0.7600   3.3    2.6	Cyg X-2                       
 54.7701  28.1665    3.0  45.0   48.7   2.7931   3.8 ------	UNKNOWN                       
258.0842  68.7362    4.7  41.0  -98.0   2.6659   2.5 ------	UNKNOWN

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

    Time interval of the image:
38.500000 72.300590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.7253  35.3131    0.0  49.5 -155.3   0.0379   0.3    9.4	Cyg X-1                       
308.2495  40.8715    5.7  41.0 -157.9  -0.1737  -2.0    8.0	Cyg X-3                       
326.3167  38.2700    8.9  34.5 -178.6   0.0946   1.3    7.5	Cyg X-2                       
355.0667  31.7832    0.5  30.6  135.9   1.8794  21.2 ------	UNKNOWN                       
335.5381  27.6748    2.3  40.0  161.6   0.4897   5.0 ------	UNKNOWN                       
324.9943  40.7668    2.6  33.1 -174.5   0.2941   4.4 ------	UNKNOWN                       
305.7032  42.8479    2.2  40.7 -153.8   0.4330   5.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
134.700600 397.600600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
307.9703  40.9158    8.3  38.5  -87.0   1.0571   1.4    6.7	Cyg X-3                       
326.1538  38.2533    4.1  24.4  -90.9   0.6511   2.8    4.2	Cyg X-2                       
355.0682  31.7881    0.6   0.0  -55.7   3.1956  19.1 ------	UNKNOWN