Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Jan 14 00:13:16 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger445321
======================================================================

  Trigger: 00445321      Segment: 000

  BAT Trigger Time: 319165755.392   [s; MET]
      Trigger Stop: 319165756.416   [s; MET]
               UTC: 2011-02-12T01:09:08.736900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 69.05298334334   Dec: 43.7024727760153  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.65
     Image Trigger?:     NO
     Rate S/N Ratio:     21.51743479135  [ if not an image trigger ]
     Image S/N Ratio:    10.65

  Analysis Position:   [ source = BAT ]
    RA: 69.05298334334   Dec: 43.7024727760153  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 69.0243350559923   Dec: 43.7153313494056  [deg; J2000]  
        { 04h 36m 05.8s , +43d 42' 55.2" }
         +/- 1.42391928048895 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.590810873400363 [arcmin] (formal 1-sigma fit error)
    SNR: 18.3591920483152
 
  Angular difference between the analysis and refined position is 1.462564 arcmin
 
  Partial Coding Fraction: 0.71875    [ including projection effects ]

  Duration
     T90: 3.69999998807907 +/- 0.499295502260052
        Measured from: -1.34400004148483
                   to: 2.35599994659424     [s; relative to TRIGTIME]
     T50: 1.86799997091293 +/- 0.425619563991435
        Measured from: 0.0079999566078186
                   to: 1.87599992752075     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.255999982357025     
                   to: 1.25599998235703     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.76399999856949     
                   to: 2.58799999952316     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.159246   0.200452   0.090642   0.020854
           0.013251   0.013957   0.012055   0.009572 [error]
 Peak      0.049457   0.077979   0.033032   0.005341
           0.006575   0.007012   0.006000   0.004746 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    4.352   -1.764    2.588
T90     3.700   -1.344    2.356
T50     1.868    0.008    1.876
Peak    1.000    0.256    1.256
 
 
====== 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      -1.942    -0.157      0.151       -           -               -         6.60e-03     -6.88e-04          6.78e-04      46.790   57
CPL     -0.790    -0.760      0.933       44.177      -7.416        12.187      3.01e-02     -1.89e-02          7.38e-02      39.510   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      -1.809     -0.207     0.197       -           -               -         1.06e-02     -1.44e-03          1.42e-03      57.400   57
CPL     -0.198     -1.160     1.563       48.612      -7.882        19.851      8.43e-02     -8.43e-02          5.51e-01      51.320   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   5.57e-08  7.82e-08  8.14e-08  1.56e-07  2.64e-07  3.71e-07   erg/cm2
      90%_error_low -6.77e-09 -6.72e-09 -1.13e-08 -3.91e-08 -2.65e-08 -5.25e-08   erg/cm2
      90%_error_hi   6.93e-09  6.73e-09  1.15e-08  4.68e-08  2.69e-08  5.82e-08   erg/cm2
Peak flux       PL   5.89e-01  4.94e-01  2.82e-01  2.39e-01  1.47e+00  1.60e+00   ph/cm2/s
      90%_error_low -1.01e-01 -5.87e-02 -4.87e-02 -7.11e-02 -1.75e-01 -1.91e-01   ph/cm2/s
      90%_error_hi   1.05e-01  5.87e-02  4.88e-02  8.66e-02  1.75e-01  1.92e-01   ph/cm2/s
 
Fluence        CPL   5.00e-08  8.92e-08  7.76e-08  3.04e-08  2.39e-07  2.47e-07   erg/cm2
      90%_error_low -7.94e-09 -9.71e-09 -1.48e-08 -1.96e-08 -2.88e-08 -3.50e-08   erg/cm2
      90%_error_hi   7.94e-09  1.00e-08  1.38e-08  5.13e-08  3.07e-08  5.73e-08   erg/cm2
Peak flux      CPL   4.87e-01  5.84e-01  2.84e-01  4.65e-02  1.39e+00  1.40e+00   ph/cm2/s
      90%_error_low -1.27e-01 -8.64e-02 -6.42e-02 -4.65e-02 -1.84e-01 -1.89e-01   ph/cm2/s
      90%_error_hi   1.28e-01  9.05e-02  5.99e-02  9.55e-02  1.84e-01  1.97e-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
   69.0243    43.7153   0.0105    33.3720  -155.1575         0.4870249     18.359 TRIG_00445321                 
 
Foreground time interval of the image:
 -1.764   2.588 (delta_t =   4.352 [sec])
Background time interval of the image:
-239.392  -1.764 (delta_t = 237.628 [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   -1.764 sec. to    2.588 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.94206     ( -0.15735   0.151049 )
Norm@50keV  : 6.60436E-03    ( -0.000688309   0.000677632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.79 using 59 PHA bins.
# Reduced chi-squared =         0.8208 for     57 degrees of freedom 
# Null hypothesis probability =   8.307482e-01
 
Photon flux (15-150 keV)    in 4.352 sec: 0.965237 ( -0.08355  0.083583 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.64496e-07 ( -2.65112e-08  2.69037e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -1.764 sec. to    2.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.790421     ( -0.760297   0.932866 )
Epeak [keV] : 44.1774      ( -7.41602 12.1875 )
Norm@50keV  : 3.00939E-02    ( -0.0188746   0.0738189 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.51 using 59 PHA bins.
# Reduced chi-squared =         0.7056 for     56 degrees of freedom 
# Null hypothesis probability =   9.534661e-01
 
Photon flux (15-150 keV)    in 4.352 sec: 0.926616 ( -0.087143  0.087184 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.38962e-07 ( -2.88367e-08  3.06682e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.256 sec. to    1.256 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.80949     ( -0.206624   0.1971 )
Norm@50keV  : 1.06269E-02    ( -0.00144085   0.00141541 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.40 using 59 PHA bins.
# Reduced chi-squared =          1.007 for     57 degrees of freedom 
# Null hypothesis probability =   4.601285e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.46987 ( -0.17498  0.17507 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.7816e-08 ( -1.33231e-08  1.35186e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.256 sec. to    1.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.197659     ( -1.16081   1.5621 )
Epeak [keV] : 48.6118      ( -7.87497 19.8587 )
Norm@50keV  : 8.42748E-02    ( -0.0844755   0.550459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.32 using 59 PHA bins.
# Reduced chi-squared =         0.9165 for     56 degrees of freedom 
# Null hypothesis probability =   6.522154e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.39435 ( -0.18424  0.18383 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.63853e-08 ( -1.388e-08  1.53121e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 3.7 sec.
Hardness ratio (energy fluence ratio) = 0.870402376873

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

    S(15-50 keV)  = 1.391888e-07
S(50-150 keV) = 9.977375e-08

    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 = -5.977284130399158E-01, IMY = 2.767280725799086E-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:
-239.392000 -1.764000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6432  22.0026    0.5  43.9  168.1   9.4266  24.6    0.9	Crab                          
142.6923  22.6297    2.3  39.5   81.9   3.4501   5.0 ------	UNKNOWN                       
202.1004  41.6524    2.2  52.6    7.7   2.9440   5.2 ------	UNKNOWN                       
158.5332  53.7991    2.2  22.5   22.0   0.8325   5.3 ------	UNKNOWN                       
265.8150  70.8018    2.5  49.0  -48.0   4.1061   4.7 ------	UNKNOWN

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

    Time interval of the image:
-1.764000 2.588000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4264  21.9655    0.0  44.1  168.4  -0.0862  -2.1   11.9	Crab                          
 74.9994  26.9521    2.3  43.4 -178.4   0.1733   5.0 ------	UNKNOWN                       
 69.0244  43.7153    0.6  33.4 -155.2   0.4870  18.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
674.808620 962.705100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
187.7006 -21.6691    2.7  52.7   26.1   3.6943   4.4 ------	UNKNOWN                       
166.5391  50.9743    2.7  25.7  172.4   0.7705   4.2 ------	UNKNOWN                       
209.2002 -16.7968    1.7  51.8   -0.4   2.9416   7.0 ------	UNKNOWN                       
181.2971  43.6406    2.9  13.8 -176.9   0.6847   4.0 ------	UNKNOWN                       
200.2579  40.7856    2.0  13.7 -113.8   1.0295   5.7 ------	UNKNOWN                       
231.0718  -7.8214    2.8  56.3  -28.6   4.0112   4.1 ------	UNKNOWN                       
237.1265  32.5377    2.7  41.1  -80.2   3.5576   4.3 ------	UNKNOWN