Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 22:32:32 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger452685
======================================================================

  Trigger: 00452685      Segment: 000

  BAT Trigger Time: 326136952.448   [s; MET]
      Trigger Stop: 326136953.472   [s; MET]
               UTC: 2011-05-03T17:35:45.530200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 132.79984224966   Dec: 52.2156973681742  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.4
     Image Trigger?:     NO
     Rate S/N Ratio:     134.029847422132  [ if not an image trigger ]
     Image S/N Ratio:    20.4

  Analysis Position:   [ source = BAT ]
    RA: 132.79984224966   Dec: 52.2156973681742  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 132.799490954221   Dec: 52.211078499856  [deg; J2000]  
        { 08h 51m 11.9s , +52d 12' 39.9" }
         +/- 0.979525171125444 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.348119802711741 [arcmin] (formal 1-sigma fit error)
    SNR: 31.329483576278
 
  Angular difference between the analysis and refined position is 0.277433 arcmin
 
  Partial Coding Fraction: 0.1191406    [ including projection effects ]

  Duration
     T90: 58.6999999284744 +/- 47.0071018572133
        Measured from: -1.64800000190735
                   to: 57.0519999265671     [s; relative to TRIGTIME]
     T50: 3.91199994087219 +/- 0.540592264284623
        Measured from: -0.00400000810623169
                   to: 3.90799993276596     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.120000004768372     
                   to: 0.879999995231628     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.57600003480911     
                   to: 203.587999999523     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.994171   5.089695   5.349838   1.786912
           0.162915   0.183378   0.185515   0.195359 [error]
 Peak      0.499534   1.103982   1.507427   0.511213
           0.034995   0.047989   0.054829   0.042377 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  210.164   -6.576  203.588
T90    58.700   -1.648   57.052
T50     3.912   -0.004    3.908
Peak    1.000   -0.120    0.880
 
 
====== 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      -1.262    -0.070      0.070       -           -               -         5.41e-03     -2.08e-04          2.08e-04      68.770   57
CPL     -1.022    -0.259      0.295      229.438     -95.808      -229.438      6.94e-03     -1.39e-03          2.40e-03      66.580   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      -1.007     -0.069     0.069       -           -               -         2.62e-01     -1.15e-02          1.15e-02      77.430   57
CPL     -0.163     -0.319     0.345      130.196     -21.415        42.560      6.08e-01     -1.62e-01          2.37e-01      54.750   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   1.16e-06  2.47e-06  4.12e-06  1.56e-05  1.13e-05  2.34e-05   erg/cm2
      90%_error_low -8.91e-08 -1.13e-07 -1.87e-07 -1.58e-06 -4.71e-07 -1.68e-06   erg/cm2
      90%_error_hi   9.16e-08  1.12e-07  1.87e-07  1.70e-06  4.72e-07  1.78e-06   erg/cm2
Peak flux       PL   6.74e+00  9.11e+00  9.07e+00  1.63e+01  3.02e+01  4.12e+01   ph/cm2/s
      90%_error_low -5.63e-01 -4.87e-01 -4.19e-01 -1.49e+00 -1.34e+00 -1.91e+00   ph/cm2/s
      90%_error_hi   5.80e-01  4.85e-01  4.17e-01  1.57e+00  1.35e+00  1.93e+00   ph/cm2/s
 
Fluence        CPL   1.09e-06  2.51e-06  4.22e-06  1.14e-05  1.12e-05  1.92e-05   erg/cm2
      90%_error_low -1.15e-07 -1.22e-07 -2.18e-07 -3.36e-06 -5.07e-07 -3.35e-06   erg/cm2
      90%_error_hi   1.17e-07  1.23e-07  2.20e-07  4.64e-06  5.05e-07  3.94e-06   erg/cm2
Peak flux      CPL   5.34e+00  9.50e+00  1.02e+01  8.49e+00  2.96e+01  3.35e+01   ph/cm2/s
      90%_error_low -7.08e-01 -5.45e-01 -5.83e-01 -1.69e+00 -1.36e+00 -2.17e+00   ph/cm2/s
      90%_error_hi   7.35e-01  5.47e-01  5.90e-01  2.19e+00  1.36e+00  2.49e+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
  132.7995    52.2111   0.0062    48.6614    23.5343        14.6476680     31.329 TRIG_00452685                 
 
Foreground time interval of the image:
 -6.576  15.453 (delta_t =  22.029 [sec])
Background time interval of the image:
-179.448  -6.576 (delta_t = 172.872 [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   -6.576 sec. to  203.588 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2618     ( -0.0702077   0.070416 )
Norm@50keV  : 5.40543E-03    ( -0.00020801   0.000207966 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.77 using 59 PHA bins.
# Reduced chi-squared =          1.207 for     57 degrees of freedom 
# Null hypothesis probability =   1.365087e-01
 
Photon flux (15-150 keV)    in 210.2 sec: 0.640570 ( -0.026155  0.026209 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13376e-05 ( -4.71067e-07  4.72164e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -6.576 sec. to  203.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.02157     ( -0.258558   0.29482 )
Epeak [keV] : 229.438      ( -95.8071 -229.438 )
Norm@50keV  : 6.93861E-03    ( -0.00139312   0.00240489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.58 using 59 PHA bins.
# Reduced chi-squared =          1.189 for     56 degrees of freedom 
# Null hypothesis probability =   1.573656e-01
 
Photon flux (15-150 keV)    in 210.2 sec: 0.631825 ( -0.027921  0.02798 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11865e-05 ( -5.07414e-07  5.04562e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.120 sec. to    0.880 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.00651     ( -0.0689762   0.0694166 )
Norm@50keV  : 0.262199    ( -0.0114741   0.0114609 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.43 using 59 PHA bins.
# Reduced chi-squared =          1.358 for     57 degrees of freedom 
# Null hypothesis probability =   3.720030e-02
 
Photon flux (15-150 keV)    in 1 sec: 30.1973 ( -1.345  1.3459 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.82905e-06 ( -1.30689e-07  1.30938e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.120 sec. to    0.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.162546     ( -0.319419   0.344629 )
Epeak [keV] : 130.196      ( -21.4148 42.5596 )
Norm@50keV  : 0.608028    ( -0.161537   0.237442 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.75 using 59 PHA bins.
# Reduced chi-squared =         0.9777 for     56 degrees of freedom 
# Null hypothesis probability =   5.221646e-01
 
Photon flux (15-150 keV)    in 1 sec: 29.6273 ( -1.3596  1.3616 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.79293e-06 ( -1.36062e-07  1.3567e-07 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 58.7 sec.
Hardness ratio (energy fluence ratio) = 1.66813058106

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

    S(15-50 keV)  = 3.630314e-06
S(50-150 keV) = 7.707246e-06

    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 = 1.042179667613151E+00, IMY = -4.538943176827844E-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:
-179.448000 -6.576000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6230  22.0246    0.5  11.4  -58.6   4.6671  21.7    0.8	Crab                          
 87.1016 -22.1631    3.1  37.7 -178.7   1.0736   3.7 ------	UNKNOWN                       
 65.1533 -27.7141    2.3  50.6 -155.3   2.6267   4.9 ------	UNKNOWN                       
 54.9539 -25.8545    4.6  55.2 -145.2   3.5998   2.5 ------	UNKNOWN                       
 48.3354  42.2708    4.2  47.0  -53.3   2.6966   2.7 ------	UNKNOWN

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

    Time interval of the image:
-6.576000 15.452600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5862  21.9888    2.4  11.4  -58.9   0.4281   4.9    3.0	Crab                          
132.7995  52.2111    0.4  48.7   23.5  14.6455  31.3 ------	UNKNOWN                       
 75.2414  -3.1360    3.7  25.4 -142.1   0.2844   3.1 ------	UNKNOWN                       
 54.9816 -25.9982    2.3  55.3 -145.4   2.2284   5.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
82.252600 962.601700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.2676  29.6390    3.3  22.7  163.0   2.3257   3.5 ------	UNKNOWN                       
 98.8527  62.2860    2.9  20.6  -58.9   2.5806   3.9 ------	UNKNOWN                       
104.8658   0.7831    3.9  56.5 -157.2  10.0416   3.0 ------	UNKNOWN                       
 96.1684   5.8413    7.2  55.3 -145.2   7.7016   1.6 ------	UNKNOWN