Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 16:59:12 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger430172
======================================================================

  Trigger: 00430172      Segment: 000

  BAT Trigger Time: 302005921.856   [s; MET]
      Trigger Stop: 302005922.88   [s; MET]
               UTC: 2010-07-28T10:31:55.829200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 44.0530055621985   Dec: 0.27954807728338  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.07
     Image Trigger?:     NO
     Rate S/N Ratio:     22.4499443206436  [ if not an image trigger ]
     Image S/N Ratio:    9.07

  Analysis Position:   [ source = BAT ]
    RA: 44.0530055621985   Dec: 0.27954807728338  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 44.050972895668   Dec: 0.296290443876571  [deg; J2000]  
        { 02h 56m 12.2s , +00d 17' 46.6" }
         +/- 1.48438603528959 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.378504934007746 [arcmin] (formal 1-sigma fit error)
    SNR: 17.3002124815293
 
  Angular difference between the analysis and refined position is 1.011918 arcmin
 
  Partial Coding Fraction: 0.1132812    [ including projection effects ]

  Duration
     T90: 12.0800000429153 +/- 2.73632743473403
        Measured from: -1.28000003099442
                   to: 10.8000000119209     [s; relative to TRIGTIME]
     T50: 4.24000006914139 +/- 1.32715634477846
        Measured from: 0.191999971866608
                   to: 4.432000041008     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.65200001001358     
                   to: 0.34799998998642     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.74400001764297     
                   to: 13.1999999880791     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.551394   0.929337   0.752256   0.234375
           0.063173   0.068249   0.060173   0.049528 [error]
 Peak      0.067621   0.175138   0.128493   0.041964
           0.017676   0.021196   0.018313   0.014161 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   14.944   -1.744   13.200
T90    12.080   -1.280   10.800
T50     4.240    0.192    4.432
Peak    1.000   -0.652    0.348
 
 
====== 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      -1.543    -0.141      0.141       -           -               -         1.19e-02     -9.69e-04          9.66e-04      52.670   57
CPL     -1.341    -0.325      0.595      173.179    -173.179      -173.179      1.48e-02     -1.48e-02          1.34e-02      52.270   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      -1.536     -0.225     0.225       -           -               -         2.75e-02     -4.11e-03          4.10e-03      48.580   57
CPL     -0.157     -1.042     1.393       66.425     -14.165        54.693      1.40e-01     -1.40e-01          5.72e-01      43.100   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   2.36e-07  4.22e-07  5.79e-07  1.65e-06  1.67e-06  2.88e-06   erg/cm2
      90%_error_low -3.34e-08 -3.72e-08 -5.94e-08 -3.37e-07 -1.44e-07 -3.86e-07   erg/cm2
      90%_error_hi   3.49e-08  3.69e-08  5.89e-08  3.90e-07  1.45e-07  4.25e-07   erg/cm2
Peak flux       PL   1.17e+00  1.16e+00  7.97e-01  8.67e-01  3.47e+00  3.99e+00   ph/cm2/s
      90%_error_low -2.77e-01 -1.86e-01 -1.39e-01 -2.62e-01 -5.34e-01 -5.90e-01   ph/cm2/s
      90%_error_hi   2.94e-01  1.84e-01  1.38e-01  3.17e-01  5.35e-01  5.91e-01   ph/cm2/s
 
Fluence        CPL   2.26e-07  4.30e-07  5.90e-07  1.24e-06  1.65e-06  2.49e-06   erg/cm2
      90%_error_low -4.10e-08 -4.24e-08 -6.60e-08 -6.29e-07 -1.53e-07 -6.41e-07   erg/cm2
      90%_error_hi   2.15e-08  4.38e-08  6.77e-08  8.24e-07  1.52e-07  7.65e-07   erg/cm2
Peak flux      CPL   9.35e-01  1.33e+00  9.01e-01  2.70e-01  3.38e+00  3.44e+00   ph/cm2/s
      90%_error_low -3.16e-01 -2.39e-01 -1.70e-01     N/A   -5.39e-01 -5.70e-01   ph/cm2/s
      90%_error_hi   3.38e-01  2.54e-01  1.74e-01     N/A    5.41e-01  6.00e-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
   44.0510     0.2963   0.0111    46.8548   146.2842         2.5566847     17.300 TRIG_00430172                 
 
Foreground time interval of the image:
 -1.744  13.200 (delta_t =  14.944 [sec])
Background time interval of the image:
-239.856  -1.744 (delta_t = 238.112 [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   -1.744 sec. to   13.200 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.54334     ( -0.141504   0.14059 )
Norm@50keV  : 1.18576E-02    ( -0.00096912   0.000966135 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.67 using 59 PHA bins.
# Reduced chi-squared =         0.9241 for     57 degrees of freedom 
# Null hypothesis probability =   6.379863e-01
 
Photon flux (15-150 keV)    in 14.94 sec: 1.49827 ( -0.12829  0.12866 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66956e-06 ( -1.44417e-07  1.45081e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.744 sec. to   13.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.34147     ( -0.324936   0.595242 )
Epeak [keV] : 173.179      ( -173.179 -173.179 )
Norm@50keV  : 1.48494E-02    ( -0.0148494   0.0134432 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.27 using 59 PHA bins.
# Reduced chi-squared =         0.9335 for     56 degrees of freedom 
# Null hypothesis probability =   6.166998e-01
 
Photon flux (15-150 keV)    in 14.94 sec: 1.48443 ( -0.13331  0.13364 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.65287e-06 ( -1.52839e-07  1.51726e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.652 sec. to    0.348 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53579     ( -0.225057   0.224616 )
Norm@50keV  : 2.75375E-02    ( -0.0041068   0.00409865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.58 using 59 PHA bins.
# Reduced chi-squared =         0.8522 for     57 degrees of freedom 
# Null hypothesis probability =   7.787775e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.47207 ( -0.53362  0.53539 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.59806e-07 ( -4.06012e-08  4.08016e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.652 sec. to    0.348 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.157096     ( -1.04166   1.39283 )
Epeak [keV] : 66.4253      ( -14.1655 54.6931 )
Norm@50keV  : 0.140041    ( -0.140041   0.572292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.10 using 59 PHA bins.
# Reduced chi-squared =         0.7697 for     56 degrees of freedom 
# Null hypothesis probability =   8.966477e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.37575 ( -0.53913  0.54137 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.45076e-07 ( -4.22424e-08  4.28229e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 12.08 sec.
Hardness ratio (energy fluence ratio) = 1.37239809592

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

    S(15-50 keV)  = 6.571974e-07
S(50-150 keV) = 1.012354e-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 = -8.874768828778155E-01, IMY = -5.922265412191633E-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:
-239.856000 -1.744000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6429  22.0213    0.3  37.6 -146.8   9.2403  36.9    0.7	Crab                          
135.4927 -40.5278    2.3  47.6   -7.5   1.8244   5.0    2.3	Vela X-1                      
 82.6387 -48.9023    2.5  34.0   48.3   1.4171   4.7 ------	UNKNOWN                       
135.7243 -23.4102    3.9  44.8  -31.0   0.9662   2.9 ------	UNKNOWN                       
 84.7293  26.3326    1.5  41.8 -144.4   2.3260   7.7 ------	UNKNOWN

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

    Time interval of the image:
-1.744000 13.200000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4242  22.0208   12.8  37.7 -147.1  -0.0472  -0.9   11.6	Crab                          
135.4396 -40.6339    3.5  47.6   -7.3   0.2396   3.3    6.2	Vela X-1                      
 71.7737 -54.1356    2.1  41.1   56.1   0.6866   5.6 ------	UNKNOWN                       
 44.0510   0.2963    0.7  46.9  146.3   2.5568  17.3 ------	UNKNOWN                       
 59.5595   4.7369    2.2  35.2  163.4   0.2826   5.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
80.644600 267.644600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 46.5138  11.9331    1.9  11.9 -149.0   0.7779   6.1 ------	UNKNOWN                       
 80.1181   4.1283    3.2  36.2  -77.4   1.0970   3.6 ------	UNKNOWN                       
 82.7902  14.3509    3.1  40.8  -92.7   2.1760   3.7 ------	UNKNOWN