Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Apr  6 02:55:09 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger634795
======================================================================

  Trigger: 00634795      Segment: 000

  BAT Trigger Time: 448001706.176   [s; MET]
      Trigger Stop: 448001707.2   [s; MET]
               UTC: 2015-03-14T04:54:52.869200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 126.658741157189   Dec: 63.8332935465329  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    25.72
     Image Trigger?:     NO
     Rate S/N Ratio:     255.998046867549  [ if not an image trigger ]
     Image S/N Ratio:    25.72

  Analysis Position:   [ source = BAT ]
    RA: 126.658741157189   Dec: 63.8332935465329  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 126.660328236612   Dec: 63.8392124312441  [deg; J2000]  
        { 08h 26m 38.5s , +63d 50' 21.2" }
         +/- 0.588461499483061 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.190676162657658 [arcmin] (formal 1-sigma fit error)
    SNR: 64.8772732461773
 
  Angular difference between the analysis and refined position is 0.357607 arcmin
 
  Partial Coding Fraction: 0.34375    [ including projection effects ]

  Duration
     T90: 14.7799999713898 +/- 2.6292173945121
        Measured from: -1.22000002861023
                   to: 13.5599999427795     [s; relative to TRIGTIME]
     T50: 5.35599994659424 +/- 0.149452374785769
        Measured from: 0.339999973773956
                   to: 5.69599992036819     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0600000023841858     
                   to: 1.06000000238419     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.17199999094009     
                   to: 101.439999997616     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     5.501021   9.974694  10.769670   3.854653
           0.089221   0.105096   0.105065   0.080690 [error]
 Peak      0.667681   1.508879   1.920925   0.711183
           0.022507   0.031847   0.036945   0.027325 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  103.612   -2.172  101.440
T90    14.780   -1.220   13.560
T50     5.356    0.340    5.696
Peak    1.000    0.060    1.060
 
 
====== 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      -1.078    -0.028      0.028       -           -               -         2.06e-02     -3.33e-04          3.32e-04      32.230   57
CPL     -0.998    -0.049      0.097      764.681    -320.593      -764.681      2.21e-02     -1.76e-03          1.61e-03      32.550   56
 
 
=== 1-s peak 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      -0.847     -0.041     0.041       -           -               -         3.35e-01     -8.21e-03          8.20e-03      53.530   57
CPL     -0.465     -0.171     0.178      248.872     -59.143       145.341      4.82e-01     -7.11e-02          8.63e-02      38.500   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   1.84e-06  4.38e-06  8.30e-06  3.82e-05  2.25e-05  5.27e-05   erg/cm2
      90%_error_low -6.54e-08 -9.31e-08 -1.26e-07 -1.38e-06 -3.34e-07 -1.41e-06   erg/cm2
      90%_error_hi   6.64e-08  9.29e-08  1.26e-07  1.42e-06  3.35e-07  1.44e-06   erg/cm2
Peak flux       PL   3.24e-03  4.01e-02  4.02e-01  3.98e+01  2.05e+00  3.97e+01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
Fluence        CPL   9.91e-07  1.28e-06  1.26e-06  2.62e-06  4.18e-06  6.05e-06   erg/cm2
      90%_error_low -1.14e-07 -1.27e-07 -1.35e-07 -3.03e-07 -4.26e-07 -6.29e-07   erg/cm2
      90%_error_hi   1.09e-07  1.28e-07  1.03e-07  2.96e-07  1.94e-06  6.38e-07   erg/cm2
Peak flux      CPL   6.58e+00  1.11e+01  1.29e+01  1.84e+01  3.80e+01  4.90e+01   ph/cm2/s
      90%_error_low -4.97e-01 -3.65e-01 -4.10e-01 -2.46e+00 -9.54e-01 -2.63e+00   ph/cm2/s
      90%_error_hi   5.09e-01  3.66e-01  4.13e-01  2.94e+00  9.55e-01  3.05e+00   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
  126.6603    63.8392   0.0030    35.0548   -64.9043        29.0996946     64.877 TRIG_00634795                 
 
Foreground time interval of the image:
 -2.172  15.525 (delta_t =  17.697 [sec])
Background time interval of the image:
-239.176  -2.172 (delta_t = 237.004 [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   -2.172 sec. to  101.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.07828     ( -0.0279837   0.0281125 )
Norm@50keV  : 2.06042E-02    ( -0.000332682   0.00033145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          32.23 using 59 PHA bins.
# Reduced chi-squared =         0.5655 for     57 degrees of freedom 
# Null hypothesis probability =   9.966844e-01
 
Photon flux (15-150 keV)    in 103.6 sec: 2.38517 ( -0.04112  0.04128 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.24771e-05 ( -3.33888e-07  3.34754e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -2.172 sec. to  101.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.998341     ( -0.0335958   0.112398 )
Epeak [keV] : 764.681      ( -555.697 -999.786 )
Norm@50keV  : 2.21281E-02    ( -0.0014489   0.00191935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          32.55 using 59 PHA bins.
# Reduced chi-squared =         0.5813 for     56 degrees of freedom 
# Null hypothesis probability =   9.948799e-01
 
Photon flux (15-150 keV)    in 103.6 sec: 0.686901 ( -0.065274  0.066958 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.17619e-06 ( -4.26374e-07  1.93942e-06 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.060 sec. to    1.060 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.846801     ( -0.0411057   0.0413497 )
Norm@50keV  : 0.334976    ( -0.00821476   0.00819899 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.53 using 59 PHA bins.
# Reduced chi-squared =         0.9392 for     57 degrees of freedom 
# Null hypothesis probability =   6.059628e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.05251 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.83999e-06 ( -9.72471e-08  9.73235e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.060 sec. to    1.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.465417     ( -0.171315   0.178015 )
Epeak [keV] : 248.872      ( -59.1431 145.341 )
Norm@50keV  : 0.482085    ( -0.0710645   0.0862548 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.50 using 59 PHA bins.
# Reduced chi-squared =         0.6874 for     56 degrees of freedom 
# Null hypothesis probability =   9.642188e-01
 
Photon flux (15-150 keV)    in 1 sec: 37.9887 ( -0.9539  0.9548 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.80811e-06 ( -1.00022e-07  9.9849e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 14.78 sec.
Hardness ratio (energy fluence ratio) = 1.89439249477

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

    S(15-50 keV)  = 6.218359e-06
S(50-150 keV) = 1.6258906e-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 = 2.975847422032998E-01, IMY = 6.353989954791968E-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:
-239.176000 -2.172000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
140.3165 -17.2656    3.0  53.2  155.9   3.9626   3.9 ------	UNKNOWN                       
162.9921   8.8144    2.7  25.8  121.0   1.0289   4.3 ------	UNKNOWN                       
172.6158  42.8240    2.2  15.9    7.5   0.9297   5.3 ------	UNKNOWN                       
110.4016  69.6649    3.0  43.7  -63.9   3.6594   3.8 ------	UNKNOWN                       
101.9049  30.6092    2.4  45.3 -121.3   4.1935   4.9 ------	UNKNOWN

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

    Time interval of the image:
-2.172000 15.524600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
138.4329 -14.6954    3.9  51.3  159.1   1.6703   3.0 ------	UNKNOWN                       
151.8799   4.0749    4.4  29.9  145.3   0.5955   2.6 ------	UNKNOWN                       
227.3525  56.6642    3.5  52.4   -1.7   1.7287   3.3 ------	UNKNOWN                       
176.2825  54.8326    3.6  25.4  -15.0   0.6562   3.2 ------	UNKNOWN                       
126.6603  63.8392    0.2  35.1  -64.9  29.0980  64.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
74.324600 781.324600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6708  21.9969    3.1  50.6 -163.6   4.0475   3.7    2.3	Crab                          
203.2919  50.2452    2.9  40.9   33.0   2.9656   4.0 ------	UNKNOWN                       
155.1360  55.5176    2.9  16.4   68.5   1.6118   4.0 ------	UNKNOWN                       
234.0262  51.2055    2.8  51.9   10.8   5.0147   4.1 ------	UNKNOWN                       
122.6235  58.0828    3.4   6.1  162.3   1.2530   3.4 ------	UNKNOWN                       
 22.0155  81.6367    2.8  29.4  -55.3   2.0740   4.1 ------	UNKNOWN                       
 64.0596  28.8830    4.3  52.4 -139.4   7.3418   2.7 ------	UNKNOWN                       
 54.6306  42.1881    3.5  45.3 -121.2   6.7671   3.3 ------	UNKNOWN