Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 01:10:52 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger532871
======================================================================

  Trigger: 00532871      Segment: 000

  BAT Trigger Time: 368670272.704   [s; MET]
      Trigger Stop: 368670273.728   [s; MET]
               UTC: 2012-09-07T00:24:23.082500    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 74.741267312283   Dec: -9.31372697920963  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.33
     Image Trigger?:     NO
     Rate S/N Ratio:     15.4919333848297  [ if not an image trigger ]
     Image S/N Ratio:    11.33

  Analysis Position:   [ source = BAT ]
    RA: 74.741267312283   Dec: -9.31372697920963  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 74.7510327743971   Dec: -9.31834471955395  [deg; J2000]  
        { 04h 59m 00.2s , -09d 19' 06.0" }
         +/- 1.81054103040935 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.678600934064407 [arcmin] (formal 1-sigma fit error)
    SNR: 13.0262889292652
 
  Angular difference between the analysis and refined position is 0.641155 arcmin
 
  Partial Coding Fraction: 0.2128906    [ including projection effects ]

  Duration
     T90: 6.08000004291534 +/- 0.784652758243599
        Measured from: 0.120000004768372
                   to: 6.20000004768372     [s; relative to TRIGTIME]
     T50: 2.65600007772446 +/- 1.5783535763625
        Measured from: 0.727999985218048
                   to: 3.3840000629425     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.107999980449677     
                   to: 1.10799998044968     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0239999890327454     
                   to: 6.93599998950958     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.253733   0.395081   0.235808   0.069745
           0.032639   0.034745   0.031863   0.029996 [error]
 Peak      0.079617   0.129969   0.102576   0.043512
           0.013795   0.015064   0.013891   0.011783 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    6.960   -0.024    6.936
T90     6.080    0.120    6.200
T50     2.656    0.728    3.384
Peak    1.000    0.108    1.108
 
 
====== 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      -1.652    -0.186      0.182       -           -               -         9.09e-03     -1.06e-03          1.05e-03      70.190   57
CPL     -0.798    -0.837      1.117       62.998     -15.558       393.682      2.68e-02     -2.68e-02          8.51e-02      67.170   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      -1.389     -0.216     0.216       -           -               -         2.36e-02     -2.98e-03          2.98e-03      61.130   57
CPL     -1.301     -1.695     0.767      411.019    -411.019      -411.019      2.61e-02     -2.61e-02          3.47e-02      61.170   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   9.32e-08  1.56e-07  1.99e-07  5.06e-07  5.88e-07  9.54e-07   erg/cm2
      90%_error_low -1.52e-08 -1.69e-08 -3.06e-08 -1.43e-07 -7.26e-08 -1.75e-07   erg/cm2
      90%_error_hi   1.57e-08  1.68e-08  3.07e-08  1.76e-07  7.36e-08  2.01e-07   erg/cm2
Peak flux       PL   8.71e-01  9.37e-01  7.16e-01  8.92e-01  2.86e+00  3.42e+00   ph/cm2/s
      90%_error_low -1.92e-01 -1.33e-01 -1.10e-01 -2.53e-01 -3.71e-01 -4.37e-01   ph/cm2/s
      90%_error_hi   2.04e-01  1.31e-01  1.08e-01  3.07e-01  3.72e-01  4.40e-01   ph/cm2/s
 
Fluence        CPL   8.47e-08  1.73e-07  1.99e-07  1.43e-07  5.41e-07  5.99e-07   erg/cm2
      90%_error_low -1.77e-08 -2.35e-08 -3.73e-08 -1.01e-07 -8.51e-08 -1.33e-07   erg/cm2
      90%_error_hi   1.78e-08  2.52e-08  3.47e-08  3.45e-07  8.70e-08  3.46e-07   erg/cm2
Peak flux      CPL   8.72e-01  9.37e-01  7.16e-01  8.91e-01  2.86e+00  3.41e+00   ph/cm2/s
      90%_error_low -1.93e-01 -1.32e-01 -1.09e-01 -5.33e-01 -3.71e-01 -6.74e-01   ph/cm2/s
      90%_error_hi   1.65e-01  1.50e-01  1.26e-01  1.70e-01  3.71e-01  4.33e-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
   74.7510    -9.3183   0.0148    37.6510   -70.5494         0.9746455     13.026 TRIG_00532871                 
 
Foreground time interval of the image:
 -0.024   6.936 (delta_t =   6.960 [sec])
Background time interval of the image:
-239.704  -0.024 (delta_t = 239.680 [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   -0.024 sec. to    6.936 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.65219     ( -0.186432   0.181809 )
Norm@50keV  : 9.08508E-03    ( -0.00106275   0.00104959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.19 using 59 PHA bins.
# Reduced chi-squared =          1.231 for     57 degrees of freedom 
# Null hypothesis probability =   1.126069e-01
 
Photon flux (15-150 keV)    in 6.96 sec: 1.18719 ( -0.12803  0.12811 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.88043e-07 ( -7.26137e-08  7.36229e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.024 sec. to    6.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.797536     ( -0.837134   1.11722 )
Epeak [keV] : 62.9985      ( -15.55 393.69 )
Norm@50keV  : 2.68387E-02    ( -0.0268494   0.0850842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.17 using 59 PHA bins.
# Reduced chi-squared =          1.199 for     56 degrees of freedom 
# Null hypothesis probability =   1.457819e-01
 
Photon flux (15-150 keV)    in 6.96 sec: 1.14958 ( -0.13469  0.13392 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.41451e-07 ( -8.51208e-08  8.69534e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.108 sec. to    1.108 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38869     ( -0.215815   0.21602 )
Norm@50keV  : 2.35565E-02    ( -0.00298107   0.00297546 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.13 using 59 PHA bins.
# Reduced chi-squared =          1.073 for     57 degrees of freedom 
# Null hypothesis probability =   3.298810e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.86151 ( -0.37116  0.37202 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.28176e-07 ( -3.1564e-08  3.17621e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.108 sec. to    1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38549     ( -1.68663   0.77452 )
Epeak [keV] : 9997.29      ( -9997.38 -9997.38 )
Norm@50keV  : 2.36444E-02    ( -0.0236444   0.0371112 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.13 using 59 PHA bins.
# Reduced chi-squared =          1.092 for     56 degrees of freedom 
# Null hypothesis probability =   2.968244e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.86162 ( -0.37143  0.37066 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.28202e-07 ( -3.3249e-08  2.94183e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 6.08 sec.
Hardness ratio (energy fluence ratio) = 1.27265361381

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

    S(15-50 keV)  = 2.4915299e-07
S(50-150 keV) = 3.388947e-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 = 2.569119331032302E-01, IMY = 7.274905239572595E-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:
-239.704000 -0.024000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 10.1919 -10.1782    2.5  30.1   70.8   1.5198   4.6 ------	UNKNOWN                       
 26.9554 -14.2590    2.4  18.8   39.3   0.8959   4.7 ------	UNKNOWN                       
 26.7413  26.1649    2.9  27.7  160.1   0.8480   4.1 ------	UNKNOWN                       
 34.9967 -25.0582    2.5  26.1    9.8   0.8697   4.6 ------	UNKNOWN                       
 44.7235 -47.9740    3.2  49.1   -2.7   1.3718   3.6 ------	UNKNOWN                       
 44.4236 -43.5212    2.6  44.7   -3.3   1.4332   4.5 ------	UNKNOWN                       
 44.6915 -44.9998    3.4  46.2   -3.3   1.1751   3.4 ------	UNKNOWN                       
 60.6637 -24.9375    2.6  33.6  -35.5   1.0496   4.5 ------	UNKNOWN                       
 63.5253  54.4485    3.2  57.4 -160.0   3.7835   3.6 ------	UNKNOWN                       
 78.0400  30.4346    3.2  47.9 -129.1   2.9233   3.6 ------	UNKNOWN                       
 79.2359   4.6301    3.7  41.0  -93.1   2.7435   3.1 ------	UNKNOWN

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

    Time interval of the image:
-0.024000 6.936000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 32.6308 -42.9180    2.3  44.1    9.0   0.2486   5.1 ------	UNKNOWN                       
 35.1525  57.7186    2.4  56.9 -179.1   0.7499   4.8 ------	UNKNOWN                       
 74.0538 -14.4557    1.8  38.5  -62.3   0.4222   6.3 ------	UNKNOWN                       
 74.7510  -9.3183    0.9  37.7  -70.5   0.9747  13.0 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
66.396590 962.386200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6356  22.0131    0.2  32.5 -158.6  36.8640  57.5    0.2	Crab                          
 62.9917 -10.8144    2.5  11.6   87.5   2.4630   4.7 ------	UNKNOWN                       
123.0413 -38.2477    3.8  52.0  -42.2  10.0806   3.0 ------	UNKNOWN