Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 17:08:01 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger430151
======================================================================

  Trigger: 00430151      Segment: 000

  BAT Trigger Time: 301976310.272   [s; MET]
      Trigger Stop: 301976311.296   [s; MET]
               UTC: 2010-07-28T02:18:24.246260    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 88.7434860359876   Dec: -15.2620375155607  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    18.8
     Image Trigger?:     NO
     Rate S/N Ratio:     47.6235235991626  [ if not an image trigger ]
     Image S/N Ratio:    18.8

  Analysis Position:   [ source = BAT ]
    RA: 88.7434860359876   Dec: -15.2620375155607  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 88.7537300185916   Dec: -15.2589432023787  [deg; J2000]  
        { 05h 55m 00.9s , -15d 15' 32.2" }
         +/- 0.479935230999046 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.117133370071712 [arcmin] (formal 1-sigma fit error)
    SNR: 86.8104011812859
 
  Angular difference between the analysis and refined position is 0.621352 arcmin
 
  Partial Coding Fraction: 0.8125    [ including projection effects ]

  Duration
     T90: 193.383999943733 +/- 10.5706947895089
        Measured from: -39.6800000071526
                   to: 153.703999936581     [s; relative to TRIGTIME]
     T50: 72.6279999613762 +/- 1.01713325763232
        Measured from: 12.6879999637604
                   to: 85.3159999251366     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 28.2639999985695     
                   to: 29.2639999985695     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -79.0080000162125     
                   to: 333.551999986172     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    11.341510  18.275949  18.211913   6.125598
           0.107760   0.115613   0.108212   0.091654 [error]
 Peak      0.093622   0.185406   0.274885   0.110421
           0.006738   0.008205   0.009069   0.007606 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  412.560  -79.008  333.552
T90   193.384  -39.680  153.704
T50    72.628   12.688   85.316
Peak    1.000   28.264   29.264
 
 
====== 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      -1.123    -0.023      0.023       -           -               -         8.70e-03     -1.19e-04          1.18e-04      23.190   57
CPL     -1.059    -0.026      0.042      996.915    -996.915      -996.915      9.19e-03     -5.54e-04          3.12e-05      25.840   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      -0.701     -0.076     0.078       -           -               -         4.32e-02     -1.88e-03          1.87e-03      70.640   57
CPL     -0.694     -0.075     0.080     9999.360    -9999.360      -9999.360      4.36e-02     -1.79e-03          8.44e-03      70.710   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   3.22e-06  7.47e-06  1.37e-05  6.03e-05  3.73e-05  8.47e-05   erg/cm2
      90%_error_low -9.83e-08 -1.37e-07 -1.66e-07 -1.75e-06 -4.43e-07 -1.75e-06   erg/cm2
      90%_error_hi   9.98e-08  1.37e-07  1.66e-07  1.78e-06  4.43e-07  1.78e-06   erg/cm2
Peak flux       PL   8.32e-01  1.35e+00  1.67e+00  4.04e+00  5.00e+00  7.89e+00   ph/cm2/s
      90%_error_low -7.95e-02 -7.90e-02 -6.98e-02 -3.78e-01 -2.07e-01 -3.95e-01   ph/cm2/s
      90%_error_hi   8.26e-02  7.85e-02  6.95e-02  4.05e-01  2.08e-01  4.07e-01   ph/cm2/s
 
Fluence        CPL   2.43e-06  3.20e-06  3.24e-06  7.45e-06  1.09e-05  1.63e-05   erg/cm2
      90%_error_low -1.68e-07 -2.00e-07 -1.89e-07 -2.73e-07 -7.02e-07 -7.23e-07   erg/cm2
      90%_error_hi   1.40e-07  1.43e-07  1.14e-07  1.68e-07  3.64e-07  4.39e-07   erg/cm2
Peak flux      CPL   8.30e-01  1.35e+00  1.67e+00  4.01e+00  5.00e+00  7.86e+00   ph/cm2/s
      90%_error_low     N/A   -7.91e-02     N/A       N/A   -2.07e-01     N/A     ph/cm2/s
      90%_error_hi      N/A    7.86e-02     N/A       N/A    2.08e-01     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
   88.7537   -15.2589   0.0022    29.3945  -177.0203         7.5304324     86.810 TRIG_00430151                 
 
Foreground time interval of the image:
-15.571  13.229 (delta_t =  28.800 [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  -79.008 sec. to  333.552 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12258     ( -0.0232794   0.0233831 )
Norm@50keV  : 8.70306E-03    ( -0.000118695   0.000118231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          23.19 using 59 PHA bins.
# Reduced chi-squared =         0.4068 for     57 degrees of freedom 
# Null hypothesis probability =   9.999803e-01
 
Photon flux (15-150 keV)    in 412.6 sec: 1.01182 ( -0.015134  0.0152 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.72811e-05 ( -4.42864e-07  4.42996e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -79.008 sec. to  333.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.11666     ( -0.0257291   0.0417934 )
Epeak [keV] : 9996.15      ( -9996.45 -9996.45 )
Norm@50keV  : 8.74750E-03    ( -0.000110763   0.000474246 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          23.33 using 59 PHA bins.
# Reduced chi-squared =         0.4166 for     56 degrees of freedom 
# Null hypothesis probability =   9.999654e-01
 
Photon flux (15-150 keV)    in 412.6 sec: 1.01474 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.08938e-05 ( -7.02035e-07  3.64153e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   28.264 sec. to   29.264 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.700784     ( -0.0762993   0.0775793 )
Norm@50keV  : 4.32418E-02    ( -0.00188355   0.00187153 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.64 using 59 PHA bins.
# Reduced chi-squared =          1.239 for     57 degrees of freedom 
# Null hypothesis probability =   1.057685e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.99798 ( -0.20737  0.20768 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.27691e-07 ( -2.33085e-08  2.33577e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   28.264 sec. to   29.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.694476     ( -0.0752392   0.0799785 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 4.35923E-02    ( -0.00178407   0.00843932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.71 using 59 PHA bins.
# Reduced chi-squared =          1.263 for     56 degrees of freedom 
# Null hypothesis probability =   8.917301e-02
 
Photon flux (15-150 keV)    in 1 sec: 4.99648 ( -0.20741  0.20754 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.29176e-07 ( -2.95213e-08  2.63572e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 193.384 sec.
Hardness ratio (energy fluence ratio) = 1.83713043676

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

    S(15-50 keV)  = 1.0692653e-05
S(50-150 keV) = 2.658882e-05

    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 = -5.625835373988104E-01, IMY = 2.928403708244022E-02

    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:
-15.571410 13.228580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5846 -40.4930    2.6  18.5   12.1   0.3539   4.5    4.5	Vela X-1                      
170.5645 -60.5169    3.9  46.1   32.4   0.6861   3.0    9.7	Cen X-3                       
 82.9128 -65.8669    2.6  40.0   86.6   1.4257   4.4 ------	UNKNOWN                       
 79.6909 -20.7412    1.9  33.9  165.5   0.6062   6.0 ------	UNKNOWN                       
 88.7537 -15.2589    0.1  29.4 -177.0   7.5305  86.8 ------	UNKNOWN                       
 80.7420  -6.9068    2.6  40.8 -174.5   0.5051   4.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
65.828600 962.828500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6278  22.0192    0.2  37.6 -146.8  35.0718  48.3    0.4	Crab                          
135.5223 -40.5409    1.7  47.7   -7.5   7.0920   6.8    0.9	Vela X-1                      
 93.3659 -61.1223    3.2  46.0   37.9   6.8725   3.6 ------	UNKNOWN                       
112.7525 -56.1962    2.8  44.8   22.3   4.3962   4.2 ------	UNKNOWN                       
 74.6165  -3.5001    2.5  18.2  169.8   2.2619   4.7 ------	UNKNOWN                       
 88.7610 -15.2598    0.3   0.0  -76.7  22.3001  41.8 ------	UNKNOWN                       
 84.7224  26.3547    1.7  41.8 -144.4   5.9298   6.7 ------	UNKNOWN