Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Oct  4 20:53:39 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger610953
======================================================================

  Trigger: 00610953      Segment: 000

  BAT Trigger Time: 430901666.496   [s; MET]
      Trigger Stop: 430901667.52   [s; MET]
               UTC: 2014-08-28T06:54:14.043420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 142.011386710826   Dec: 14.5900409767357  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.41
     Image Trigger?:     NO
     Rate S/N Ratio:     15.8429795177549  [ if not an image trigger ]
     Image S/N Ratio:    7.41

  Analysis Position:   [ source = BAT ]
    RA: 142.011386710826   Dec: 14.5900409767357  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 142.031859306659   Dec: 14.5707244181277  [deg; J2000]  
        { 09h 28m 07.6s , +14d 34' 14.6" }
         +/- 1.30925079351341 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.456747113227155 [arcmin] (formal 1-sigma fit error)
    SNR: 20.6986912271668
 
  Angular difference between the analysis and refined position is 1.660272 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 19.1480000019073 +/- 4.15046982043008
        Measured from: -4.54000002145767
                   to: 14.6079999804497     [s; relative to TRIGTIME]
     T50: 6.97199994325638 +/- 1.23631711278944
        Measured from: -0.903999984264374
                   to: 6.067999958992     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.495999991893768     
                   to: 1.49599999189377     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.70800000429153     
                   to: 18.3159999847412     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.671385   0.942972   0.617877   0.145847
           0.054356   0.057814   0.052082   0.046585 [error]
 Peak      0.067157   0.104422   0.079420  -0.001374
           0.011286   0.012532   0.012194   0.009781 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   25.024   -6.708   18.316
T90    19.148   -4.540   14.608
T50     6.972   -0.904    6.068
Peak    1.000    0.496    1.496
 
 
====== 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      -1.729    -0.127      0.124       -           -               -         6.38e-03     -5.02e-04          4.98e-04      65.250   57
CPL     -0.795    -0.570      0.654       59.789      -9.443        24.332      2.01e-02     -9.99e-03          2.42e-02      56.840   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      -1.715     -0.240     0.228       -           -               -         1.67e-02     -2.67e-03          2.62e-03      56.090   57
CPL     -0.801     -0.864     1.076       60.211     -16.117       154.545      5.27e-02     -5.27e-02          1.52e-01      52.730   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   2.53e-07  4.04e-07  4.88e-07  1.15e-06  1.48e-06  2.30e-06   erg/cm2
      90%_error_low -2.79e-08 -2.93e-08 -5.09e-08 -2.29e-07 -1.20e-07 -2.80e-07   erg/cm2
      90%_error_hi   2.87e-08  2.93e-08  5.10e-08  2.63e-07  1.21e-07  3.06e-07   erg/cm2
Peak flux       PL   8.47e-01  7.50e-01  4.57e-01  4.22e-01  2.23e+00  2.48e+00   ph/cm2/s
      90%_error_low -1.71e-01 -1.06e-01 -9.24e-02 -1.44e-01 -3.15e-01 -3.55e-01   ph/cm2/s
      90%_error_hi   1.78e-01  1.06e-01  9.26e-02  1.81e-01  3.15e-01  3.58e-01   ph/cm2/s
 
Fluence        CPL   2.23e-07  4.47e-07  4.96e-07  3.29e-07  1.37e-06  1.50e-06   erg/cm2
      90%_error_low -3.36e-08 -3.88e-08 -5.85e-08 -1.60e-07 -1.32e-07 -2.08e-07   erg/cm2
      90%_error_hi   3.39e-08  3.98e-08  5.79e-08  3.35e-07  1.36e-07  3.48e-07   erg/cm2
Peak flux      CPL   7.55e-01  8.36e-01  4.79e-01  1.58e-01  2.18e+00  2.23e+00   ph/cm2/s
      90%_error_low -1.95e-01 -1.33e-01 -1.08e-01 -1.58e-01 -3.17e-01 -3.39e-01   ph/cm2/s
      90%_error_hi   1.99e-01  1.40e-01  1.08e-01  2.49e-01  3.18e-01  3.69e-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
  142.0319    14.5707   0.0094    38.1020   -60.1641         2.5010720     20.699 TRIG_00610953                 
 
Foreground time interval of the image:
 -6.708  18.316 (delta_t =  25.024 [sec])
Background time interval of the image:
-239.496  -6.708 (delta_t = 232.788 [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   -6.708 sec. to   18.316 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72921     ( -0.126522   0.123863 )
Norm@50keV  : 6.38423E-03    ( -0.000502301   0.000497927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.25 using 59 PHA bins.
# Reduced chi-squared =          1.145 for     57 degrees of freedom 
# Null hypothesis probability =   2.119278e-01
 
Photon flux (15-150 keV)    in 25.02 sec: 0.856771 ( -0.062449  0.062508 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.47604e-06 ( -1.20326e-07  1.21486e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -6.708 sec. to   18.316 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.795098     ( -0.570356   0.653584 )
Epeak [keV] : 59.7894      ( -9.44257 24.3325 )
Norm@50keV  : 2.01133E-02    ( -0.00998719   0.0241893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.84 using 59 PHA bins.
# Reduced chi-squared =          1.015 for     56 degrees of freedom 
# Null hypothesis probability =   4.435145e-01
 
Photon flux (15-150 keV)    in 25.02 sec: 0.823244 ( -0.065624  0.065606 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.36889e-06 ( -1.32093e-07  1.35666e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.496 sec. to    1.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71495     ( -0.239993   0.228024 )
Norm@50keV  : 1.67282E-02    ( -0.002673   0.00262152 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.09 using 59 PHA bins.
# Reduced chi-squared =         0.9840 for     57 degrees of freedom 
# Null hypothesis probability =   5.092634e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.23352 ( -0.31455  0.31462 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.54732e-07 ( -2.54703e-08  2.5948e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.496 sec. to    1.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.800567     ( -0.864026   1.07626 )
Epeak [keV] : 60.2114      ( -16.1188 154.543 )
Norm@50keV  : 5.27295E-02    ( -0.0527255   0.151759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.73 using 59 PHA bins.
# Reduced chi-squared =         0.9417 for     56 degrees of freedom 
# Null hypothesis probability =   5.992407e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.18344 ( -0.31736  0.31774 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.45422e-07 ( -2.65198e-08  2.73805e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 19.148 sec.
Hardness ratio (energy fluence ratio) = 1.1108105157

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

    S(15-50 keV)  = 6.698212e-07
S(50-150 keV) = 6.990698e-07

    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 = 3.901322941736836E-01, IMY = 6.802207809030785E-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:
-239.496000 -6.708000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6299  22.0084    0.5  42.7   31.8   9.9746  23.9    0.4	Crab                          
 92.9809   3.2604    3.1  53.9    8.1   2.9080   3.7 ------	UNKNOWN                       
223.7665  48.7589    3.1  59.3 -163.3   5.2775   3.7 ------	UNKNOWN

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

    Time interval of the image:
-6.708000 18.316000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4978  22.1172   21.6  42.6   32.0  -0.0649  -0.5    9.7	Crab                          
 72.2379  26.8873    2.0  46.0   47.5   1.3455   5.7 ------	UNKNOWN                       
253.1212  74.9958    2.2  50.4  162.8   0.9108   5.2 ------	UNKNOWN                       
243.8160  80.3096    1.9  45.4  159.4   0.7854   6.1 ------	UNKNOWN                       
124.7541  29.3537    2.8  20.7  -32.3   0.2211   4.1 ------	UNKNOWN                       
151.4314  40.8115    2.5  20.7 -106.3   0.3021   4.7 ------	UNKNOWN                       
114.0465  -8.3612    2.2  59.1  -20.1   1.7338   5.4 ------	UNKNOWN                       
142.0319  14.5706    0.6  38.1  -60.2   2.5007  20.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
274.204600 815.404610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3645  35.5112    8.6  44.8   50.6  -2.0026  -1.3   11.1	Her X-1                       
249.5644  29.3340    3.2  40.1   59.0   3.8592   3.6 ------	UNKNOWN                       
257.9235  50.6884    4.0  50.9   31.4   5.2275   2.9 ------	UNKNOWN                       
239.2438  51.9061    2.4  41.2   22.1   2.8450   4.8 ------	UNKNOWN                       
202.5725 -27.7441    3.0  47.3  176.7   2.4944   3.9 ------	UNKNOWN                       
206.2435  -5.8254    2.9  25.3  172.8   1.3923   3.9 ------	UNKNOWN                       
183.4243 -35.2964    2.2  59.0 -166.1  10.5755   5.3 ------	UNKNOWN                       
175.6977 -29.8293    3.3  57.6 -156.3   8.0730   3.5 ------	UNKNOWN