Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 19:08:23 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger176453
======================================================================

  Trigger: 00176453      Segment: 000

  BAT Trigger Time: 158423952.704   [s; MET]
      Trigger Stop: 158423953.728   [s; MET]
               UTC: 2006-01-08T14:39:11.760360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 146.991545670284   Dec: 31.9164170544607  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.51
     Image Trigger?:     NO
     Rate S/N Ratio:     13.7477270848675  [ if not an image trigger ]
     Image S/N Ratio:    8.51

  Analysis Position:   [ source = BAT ]
    RA: 146.991545670284   Dec: 31.9164170544607  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 147.01909205963   Dec: 31.9313639482555  [deg; J2000]  
        { 09h 48m 04.6s , +31d 55' 52.9" }
         +/- 1.3376802573893 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.640649173699714 [arcmin] (formal 1-sigma fit error)
    SNR: 20.0731287118385
 
  Angular difference between the analysis and refined position is 1.664971 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 14.2200000286102 +/- 2.14442533480997
        Measured from: -2.56000000238419
                   to: 11.660000026226     [s; relative to TRIGTIME]
     T50: 4.9040000140667 +/- 0.840951826128777
        Measured from: 0.780000001192093
                   to: 5.68400001525879     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.604000002145767     
                   to: 1.60400000214577     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.02399998903275     
                   to: 13.2280000150204     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.292122   0.249592   0.144702   0.028160
           0.018911   0.019701   0.016855   0.013845 [error]
 Peak      0.026406   0.042154   0.018874   0.011895
           0.004786   0.005147   0.004299   0.003347 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   17.252   -4.024   13.228
T90    14.220   -2.560   11.660
T50     4.904    0.780    5.684
Peak    1.000    0.604    1.604
 
 
====== 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      -1.997    -0.168      0.161       -           -               -         2.34e-03     -2.47e-04          2.41e-04      49.820   57
CPL     -2.006    -0.104      0.628       30.421      N/A           N/A         2.31e-03        N/A               N/A         49.820   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      -1.675     -0.265     0.254       -           -               -         5.69e-03     -9.87e-04          9.66e-04      52.620   57
CPL     -0.543     -1.231     1.875       55.286     -14.226       -55.286      2.51e-02     -2.51e-02          2.76e-01      50.530   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   8.23e-08  1.12e-07  1.12e-07  2.03e-07  3.72e-07  5.09e-07   erg/cm2
      90%_error_low -9.80e-09 -9.09e-09 -1.63e-08 -5.40e-08 -3.65e-08 -7.23e-08   erg/cm2
      90%_error_hi   1.01e-08  9.09e-09  1.66e-08  6.59e-08  3.72e-08  8.15e-08   erg/cm2
Peak flux       PL   2.77e-01  2.51e-01  1.57e-01  1.50e-01  7.49e-01  8.36e-01   ph/cm2/s
      90%_error_low -6.19e-02 -3.89e-02 -3.46e-02 -5.55e-02 -1.15e-01 -1.32e-01   ph/cm2/s
      90%_error_hi   6.46e-02  3.88e-02  3.46e-02  7.20e-02  1.15e-01  1.33e-01   ph/cm2/s
 
Fluence        CPL   8.24e-08  1.12e-07  1.12e-07  2.07e-07  3.72e-07  5.13e-07   erg/cm2
      90%_error_low -9.32e-09 -1.91e-08 -1.60e-08 -1.28e-07 -4.32e-08 -1.48e-07   erg/cm2
      90%_error_hi   1.05e-08  1.19e-08  1.31e-08  1.81e-07  3.78e-08  9.01e-08   erg/cm2
Peak flux      CPL   2.48e-01  2.88e-01  1.58e-01  4.02e-02  7.25e-01  7.34e-01   ph/cm2/s
      90%_error_low -7.43e-02 -5.75e-02 -4.54e-02 -4.02e-02 -1.19e-01 -1.26e-01   ph/cm2/s
      90%_error_hi   7.40e-02  6.17e-02  4.06e-02  1.31e-01  1.19e-01  1.66e-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
  147.0191    31.9314   0.0095    16.3729   -14.4375         0.7151399     20.073 TRIG_00176453                 
 
Foreground time interval of the image:
 -4.024  11.197 (delta_t =  15.221 [sec])
Background time interval of the image:
-299.704  -4.024 (delta_t = 295.680 [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   -4.024 sec. to   13.228 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.99738     ( -0.168319   0.161021 )
Norm@50keV  : 2.33748E-03    ( -0.000246744   0.000241177 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.82 using 59 PHA bins.
# Reduced chi-squared =         0.8740 for     57 degrees of freedom 
# Null hypothesis probability =   7.388576e-01
 
Photon flux (15-150 keV)    in 17.25 sec: 0.350226 ( -0.028502  0.028518 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.71851e-07 ( -3.64853e-08  3.71824e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.024 sec. to   13.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.00632     ( -0.10405   0.627948 )
Epeak [keV] : 30.4214      (   )
Norm@50keV  : 2.31060E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.82 using 59 PHA bins.
# Reduced chi-squared =         0.8896 for     56 degrees of freedom 
# Null hypothesis probability =   7.065648e-01
 
Photon flux (15-150 keV)    in 17.25 sec: 0.350377 ( -0.028415  0.029231 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.72227e-07 ( -4.32175e-08  3.77587e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.604 sec. to    1.604 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.6755     ( -0.265274   0.253541 )
Norm@50keV  : 5.68579E-03    ( -0.000986892   0.000965753 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.62 using 59 PHA bins.
# Reduced chi-squared =         0.9231 for     57 degrees of freedom 
# Null hypothesis probability =   6.400871e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.748818 ( -0.115039  0.115059 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.27594e-08 ( -9.52693e-09  9.73052e-09 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.604 sec. to    1.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.542794     ( -1.23114   1.87423 )
Epeak [keV] : 55.2864      ( -14.214 -55.2744 )
Norm@50keV  : 2.50591E-02    ( -0.0250907   0.275674 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.53 using 59 PHA bins.
# Reduced chi-squared =         0.9023 for     56 degrees of freedom 
# Null hypothesis probability =   6.812574e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.724853 ( -0.119305  0.119083 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.73031e-08 ( -1.04274e-08  1.1588e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 14.22 sec.
Hardness ratio (energy fluence ratio) = 1.00186681592

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

    S(15-50 keV)  = 1.9415375e-07
S(50-150 keV) = 1.776986e-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 = 2.845244767049336E-01, IMY = 7.325220387693542E-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:
-299.704000 -4.024000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6330  22.0156    0.4  41.1  144.0  12.2611  25.9    0.1	Crab                          
191.6780  34.3330    2.7  50.7  -44.4   4.1510   4.3 ------	UNKNOWN                       
187.3989  50.1064    3.0  43.6  -64.2   3.7623   3.8 ------	UNKNOWN                       
145.7057  79.6174    3.0  43.1 -112.7   3.2062   3.8 ------	UNKNOWN

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

    Time interval of the image:
-4.024000 11.196590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5200  21.9072    5.4  41.2  143.9   0.1685   2.1    9.0	Crab                          
147.0191  31.9313    0.6  16.4  -14.4   0.7150  20.0 ------	UNKNOWN                       
 46.9241  46.8349    2.5  58.4 -169.8   0.8768   4.6 ------	UNKNOWN                       
188.7064  45.7971    2.3  45.1  -58.3   0.7435   5.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
73.196600 302.352300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 82.1988  69.2800    3.1  51.5  162.9   2.0762   3.8 ------	UNKNOWN                       
135.3167  44.4224    3.1  15.5  154.3   0.5087   3.7 ------	UNKNOWN                       
164.0628  -1.3341    2.5  36.9  -22.3   0.8323   4.7 ------	UNKNOWN                       
244.3148  84.1193    2.9  59.1 -166.2   4.2010   4.0 ------	UNKNOWN                       
170.7315 -18.0851    2.9  54.9  -20.9   1.8920   4.0 ------	UNKNOWN                       
198.0841  62.5382    3.1  44.4 -142.1   1.1169   3.7 ------	UNKNOWN                       
184.3662  -4.2649    3.0  50.7  -44.5   3.0870   3.9 ------	UNKNOWN                       
192.7812  23.7254    2.8  41.0  -83.4   2.8509   4.1 ------	UNKNOWN