Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 22:20:14 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger326115
======================================================================

  Trigger: 00326115      Segment: 000

  BAT Trigger Time: 244306896   [s; MET]
      Trigger Stop: 244307008   [s; MET]
               UTC: 2008-09-28T15:01:32.866720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 95.0835644412627   Dec: -55.1733396233429  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.92
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.92

  Analysis Position:   [ source = BAT ]
    RA: 95.0835644412627   Dec: -55.1733396233429  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 95.058610136362   Dec: -55.1721837603487  [deg; J2000]  
        { 06h 20m 14.1s , -55d 10' 19.9" }
         +/- 2.22365324793861 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.08809643498494 [arcmin] (formal 1-sigma fit error)
    SNR: 9.7119913490269
 
  Angular difference between the analysis and refined position is 0.857898 arcmin
 
  Partial Coding Fraction: 0.84375    [ including projection effects ]

  Duration
     T90: 233.659999996424 +/- 20.801387839765
        Measured from: 64.4600000083447
                   to: 298.120000004768     [s; relative to TRIGTIME]
     T50: 44.8200000226498 +/- 57.5690179148642
        Measured from: 180.979999989271
                   to: 225.800000011921     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 202.82800000906     
                   to: 203.82800000906     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 51.2919999957085     
                   to: 318.939999997616     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.478276   1.639722   1.049559   0.301031
           0.079465   0.082424   0.073738   0.067923 [error]
 Peak      0.071823   0.101017   0.074604   0.016848
           0.005805   0.006140   0.005662   0.004525 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  267.648   51.292  318.940
T90   233.660   64.460  298.120
T50    44.820  180.980  225.800
Peak    1.000  202.828  203.828
 
 
====== 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      -1.728    -0.116      0.114       -           -               -         9.85e-04     -6.40e-05          6.33e-05      56.610   57
CPL     -1.725    -0.478      0.231     9999.360      N/A           N/A         9.86e-04        N/A               N/A         56.620   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      -1.504     -0.125     0.123       -           -               -         1.66e-02     -1.21e-03          1.20e-03      57.560   57
CPL     -1.230     -0.337     0.517      138.437      N/A           N/A         2.30e-02        N/A               N/A         56.570   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   4.16e-07  6.65e-07  8.02e-07  1.90e-06  2.43e-06  3.78e-06   erg/cm2
      90%_error_low -4.01e-08 -3.89e-08 -7.25e-08 -3.41e-07 -1.65e-07 -4.07e-07   erg/cm2
      90%_error_hi   4.12e-08  3.89e-08  7.28e-08  3.92e-07  1.67e-07  4.47e-07   erg/cm2
Peak flux       PL   6.88e-01  6.90e-01  4.87e-01  5.45e-01  2.08e+00  2.41e+00   ph/cm2/s
      90%_error_low -8.01e-02 -5.03e-02 -4.54e-02 -9.76e-02 -1.45e-01 -1.71e-01   ph/cm2/s
      90%_error_hi   8.29e-02  5.01e-02  4.52e-02  1.10e-01  1.45e-01  1.73e-01   ph/cm2/s
 
Fluence        CPL   4.19e-07  6.60e-07  8.03e-07  1.98e-06  2.46e-06  3.75e-06   erg/cm2
      90%_error_low -5.09e-08 -4.22e-08    N/A    -8.25e-07 -1.20e-07 -7.45e-07   erg/cm2
      90%_error_hi   4.58e-08  5.39e-08    N/A     1.15e-07  1.30e-07  4.48e-07   erg/cm2
Peak flux      CPL   6.56e-01  7.08e-01  4.96e-01  3.89e-01  2.05e+00  2.25e+00   ph/cm2/s
      90%_error_low -9.63e-02 -5.87e-02 -4.87e-02 -1.66e-01 -1.53e-01 -2.36e-01   ph/cm2/s
      90%_error_hi   9.78e-02  6.01e-02  4.97e-02  1.89e-01  1.52e-01  2.64e-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
   95.0586   -55.1722   0.0199    13.9052    96.1645         0.8770481      9.712 TRIG_00326115                 
 
Foreground time interval of the image:
 51.292  81.080 (delta_t =  29.788 [sec])
 82.000 121.301 (delta_t =  39.301 [sec])
Background time interval of the image:
-239.000  51.292 (delta_t = 290.292 [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
    Multiple GTIs in the spectrum
tstart tstop
51.292000 81.080000
82.000000 318.940000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72835     ( -0.11553   0.113836 )
Norm@50keV  : 9.84801E-04    ( -6.40128e-05   6.33251e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.61 using 59 PHA bins.
# Reduced chi-squared =         0.9931 for     57 degrees of freedom 
# Null hypothesis probability =   4.897052e-01
 
Photon flux (15-150 keV)    in 266.7 sec: 0.132121 ( -0.007797  0.007809 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.42713e-06 ( -1.6492e-07  1.66828e-07 ) ergs/cm2
    Cutoff power-law model
    Multiple GTIs in the spectrum
tstart tstop
51.292000 81.080000
82.000000 318.940000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.13228     ( -0.0705372   0.638104 )
Epeak [keV] : 52.2383      (   )
Norm@50keV  : 6.17813E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.07 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     56 degrees of freedom 
# Null hypothesis probability =   4.724066e-01
 
Photon flux (15-150 keV)    in 266.7 sec: 0.133204 ( -0.008944  0.006781 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.4601e-06 ( -1.20441e-07  1.29798e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  202.828 sec. to  203.828 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50413     ( -0.12484   0.123306 )
Norm@50keV  : 1.66397E-02    ( -0.00120894   0.00120157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.56 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.541589e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.07966 ( -0.1452  0.14529 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.57765e-07 ( -1.26742e-08  1.28079e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  202.828 sec. to  203.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.23033     ( -0.336859   0.51688 )
Epeak [keV] : 138.437      (   )
Norm@50keV  : 2.29803E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.57 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     56 degrees of freedom 
# Null hypothesis probability =   4.535879e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.05250 ( -0.15275  0.15199 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.54064e-07 ( -1.42567e-08  1.42228e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = -2.658508904638654E-02, IMY = -2.461406601491512E-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:
-239.000000 51.292000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5745 -40.5740    1.8  19.0 -130.3   1.2256   6.3    2.4	Vela X-1                      
170.3844 -60.8335    0.0  25.9  -49.0  -0.3636  -1.5   12.8	Cen X-3                       
186.7159 -62.7218    3.0  32.7  -40.7   0.9833   3.9    3.3	GX 301-2                      
277.7693 -65.0809    2.7  57.1   -0.3   4.5622   4.3 ------	UNKNOWN

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

    Time interval of the image:
51.292000 81.080000
82.000000 121.300590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7876 -40.6350    0.0  19.1 -129.8  -0.0516  -0.6   12.7	Vela X-1                      
170.6983 -60.5910    7.4  26.1  -49.4  -0.1490  -1.6   11.4	Cen X-3                       
186.6426 -62.8063   19.2  32.6  -40.6   0.0662   0.6    2.2	GX 301-2                      
 39.9294 -76.4396    2.3  33.4   35.3   0.6477   5.1 ------	UNKNOWN                       
 88.2710 -48.4435    2.1  20.7  110.4   0.5511   5.5 ------	UNKNOWN                       
 95.0555 -55.1695    1.2  13.9   96.2   0.8804   9.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
158.900590 543.130000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7103 -40.4972   11.0  30.4 -103.1   1.4398   1.1    9.0	Vela X-1                      
170.1904 -60.6777    6.0  38.0  -51.5   3.1881   1.9    4.9	Cen X-3                       
186.8560 -62.6924    6.6  43.8  -42.8  -3.4767  -1.7    7.2	GX 301-2                      
 60.4453 -34.5418    3.1  31.5  115.0   6.8691   3.7 ------	UNKNOWN                       
 21.9178 -73.4699    2.8  33.5   28.2   5.6159   4.1 ------	UNKNOWN                       
127.5292 -14.4024    2.3  47.8 -136.9  12.1706   4.9 ------	UNKNOWN