Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 22:11:42 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger454473
======================================================================

  Trigger: 00454473      Segment: 000

  BAT Trigger Time: 328462269.696   [s; MET]
      Trigger Stop: 328462277.888   [s; MET]
               UTC: 2011-05-30T15:31:02.689700    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 282.044970301811   Dec: 61.9318358067532  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.75
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6619037896906  [ if not an image trigger ]
     Image S/N Ratio:    9.75

  Analysis Position:   [ source = BAT ]
    RA: 282.044970301811   Dec: 61.9318358067532  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 282.031262557192   Dec: 61.9277373575728  [deg; J2000]  
        { 18h 48m 07.5s , +61d 55' 39.9" }
         +/- 1.9741407963206 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.794552005179749 [arcmin] (formal 1-sigma fit error)
    SNR: 11.5119695502124
 
  Angular difference between the analysis and refined position is 0.458530 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 55.7280000448227 +/- 12.5300432424269
        Measured from: -40.6719999909401
                   to: 15.0560000538826     [s; relative to TRIGTIME]
     T50: 26.5440000295639 +/- 12.2332320748672
        Measured from: -19.7439999580383
                   to: 6.80000007152557     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.02799999713898     
                   to: 2.02799999713898     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -48.8639999628067     
                   to: 17.37600004673     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.325218   0.369513   0.194481   0.067504
           0.043281   0.044643   0.039845   0.035811 [error]
 Peak      0.015274   0.017289   0.019892   0.002273
           0.005710   0.005579   0.005013   0.004416 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   66.240  -48.864   17.376
T90    55.728  -40.672   15.056
T50    26.544  -19.744    6.800
Peak    1.000    1.028    2.028
 
 
====== 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      -1.869    -0.287      0.269       -           -               -         7.97e-04     -1.46e-04          1.41e-04      60.710   57
CPL     -1.876     N/A        N/A        9998.970      N/A           N/A         7.93e-04        N/A               N/A         60.720   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      -1.252     -0.574     0.585       -           -               -         3.65e-03     -1.05e-03          1.05e-03      50.350   57
CPL     -1.247     -0.579     0.589     9999.360    -9999.360      -9999.360      3.67e-03     -1.06e-03          1.49e-02      50.350   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   9.54e-08  1.40e-07  1.53e-07  3.15e-07  4.85e-07  7.04e-07   erg/cm2
      90%_error_low -1.89e-08 -1.97e-08 -3.80e-08 -1.33e-07 -8.60e-08 -1.78e-07   erg/cm2
      90%_error_hi   1.94e-08  1.96e-08  3.91e-08  1.88e-07  8.92e-08  2.23e-07   erg/cm2
Peak flux       PL   1.19e-01  1.38e-01  1.16e-01  1.65e-01  4.32e-01  5.38e-01   ph/cm2/s
      90%_error_low -6.17e-02 -4.83e-02 -4.23e-02 -9.99e-02 -1.27e-01 -1.61e-01   ph/cm2/s
      90%_error_hi   7.42e-02  4.54e-02  4.02e-02  1.71e-01  1.28e-01  1.72e-01   ph/cm2/s
 
Fluence        CPL   9.59e-08  1.25e-07  1.40e-07  3.81e-07  4.14e-07  7.04e-07   erg/cm2
      90%_error_low -2.08e-08 -3.02e-08 -2.64e-08 -1.84e-07 -1.00e-07 -2.79e-07   erg/cm2
      90%_error_hi   2.00e-08  2.91e-08  2.33e-08  1.22e-07  1.00e-07  1.01e-07   erg/cm2
Peak flux      CPL   1.19e-01  1.38e-01  1.16e-01  1.64e-01  4.32e-01  5.62e-01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A   -2.08e-01   ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A    1.71e-01   ph/cm2/s
 
======================================================================




Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  282.0313    61.9277   0.0166    15.9611   -38.3848         1.0502762     11.512 TRIG_00454473                 
 
Foreground time interval of the image:
-48.864  17.376 (delta_t =  66.240 [sec])
Background time interval of the image:
-234.795 -48.864 (delta_t = 185.931 [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  -48.864 sec. to   17.376 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.86893     ( -0.287469   0.268998 )
Norm@50keV  : 7.96516E-04    ( -0.00014629   0.000140808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.71 using 59 PHA bins.
# Reduced chi-squared =          1.065 for     57 degrees of freedom 
# Null hypothesis probability =   3.435935e-01
 
Photon flux (15-150 keV)    in 66.24 sec: 0.112837 ( -0.0156726  0.015672 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.85121e-07 ( -8.59948e-08  8.91941e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -48.864 sec. to   17.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.25716     (       )
Epeak [keV] : 98.5114      (   )
Norm@50keV  : 5.02775E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.58 using 59 PHA bins.
# Reduced chi-squared =          1.082 for     56 degrees of freedom 
# Null hypothesis probability =   3.142092e-01
 
Photon flux (15-150 keV)    in 66.24 sec: 0.105476 ( -0.0252752  0.021322 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.13561e-07 ( -9.99509e-08  1.00352e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model
Time interval is from    1.028 sec. to    2.028 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25195     ( -0.574446   0.584744 )
Norm@50keV  : 3.65199E-03    ( -0.00105236   0.00104891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.35 using 59 PHA bins.
# Reduced chi-squared =         0.8832 for     57 degrees of freedom 
# Null hypothesis probability =   7.211345e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.432069 ( -0.127057  0.12757 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.65351e-08 ( -1.19258e-08  1.22323e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.028 sec. to    2.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.24704     ( -0.578667   0.588774 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 3.66811E-03    ( -0.001059   0.0148689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.35 using 59 PHA bins.
# Reduced chi-squared =         0.8991 for     56 degrees of freedom 
# Null hypothesis probability =   6.877700e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.432008 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.67046e-08 ( -1.35664e-08  1.38732e-08 ) ergs/cm2
 

Time-resolved spectra




Distribution

T90 vs. Hardness ratio plot

T90                                   = 55.728 sec.
Hardness ratio (energy fluence ratio) = 1.09514046296

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

S(15-50 keV)  = 2.3539069e-07
S(50-150 keV) = 2.4972859e-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 = 2.241918560127483E-01, IMY = 1.775956978590825E-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:
-234.795400 -48.864000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4688  35.4925    9.3  22.2   73.3   0.2514   1.2    9.0	Her X-1                       
299.5766  35.1908    0.7  39.0    4.1   4.2328  16.6    0.9	Cyg X-1                       
308.0822  40.9489    3.1  39.2   -9.9   0.8910   3.7    1.3	Cyg X-3                       
326.2625  38.5218    0.0  50.7  -21.8  -0.2783  -0.7   12.7	Cyg X-2                       
229.4101  21.3184    3.0  39.6  113.3   2.5035   3.8 ------	UNKNOWN                       
186.5151  49.1619    2.4  38.0 -173.6   1.1739   4.8 ------	UNKNOWN                       
307.9839  37.5681    2.5  41.6   -6.2   1.2557   4.7 ------	UNKNOWN                       
159.2817  46.5741    4.2  53.1 -158.8   1.2844   2.8 ------	UNKNOWN                       
344.3127  50.6594    3.1  50.6  -44.7   3.1240   3.7 ------	UNKNOWN                       

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

Time interval of the image:
-48.864000 17.376000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4343  35.3444   69.7  22.3   73.5   0.0202   0.2    1.1	Her X-1                       
299.6110  35.0193    7.6  39.1    4.2  -0.2309  -1.5   11.0	Cyg X-1                       
308.1278  41.1507    0.0  39.1  -10.2  -0.3043  -2.2   11.9	Cyg X-3                       
326.3078  38.3148    5.5  50.8  -21.7  -0.4846  -2.1    6.4	Cyg X-2                       
260.5288  24.8397    2.3  33.4   64.9   1.0474   5.1 ------	UNKNOWN                       
297.3678  18.3983    2.4  51.8   19.8   1.9218   4.8 ------	UNKNOWN                       
282.0312  61.9277    1.0  16.0  -38.4   1.0504  11.5 ------	UNKNOWN                       
316.5259  38.4889    2.6  45.5  -14.3   0.7585   4.5 ------	UNKNOWN                       
146.8463  64.5937    2.1  45.2 -135.5   1.2421   5.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
417.904620 962.437300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4696  35.3290   18.8  31.7  104.0   0.4588   0.6    1.0	Her X-1                       
299.5756  35.1851    0.5  28.9   27.5  10.8137  24.2    1.2	Cyg X-1                       
308.0802  40.9418    1.4  26.2    9.3   3.1863   8.0    1.5	Cyg X-3                       
326.2086  38.3033   10.9  35.7  -11.3   0.5115   1.0    2.1	Cyg X-2                       
195.0475  39.8459    2.5  54.3  167.3   8.7778   4.7 ------	UNKNOWN                       
249.8494  55.3593    3.4  17.8  141.1   1.4152   3.4 ------	UNKNOWN                       
326.9327  40.7509    2.9  34.0  -14.6   1.8236   3.9 ------	UNKNOWN                       
141.4894  59.0790    3.5  55.2 -145.3  12.3317   3.4 ------	UNKNOWN                       
140.7748  59.2445    7.2  55.2 -144.8   5.6084   1.7 ------	UNKNOWN