Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 12:51:48 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger232585
======================================================================

  Trigger: 00232585      Segment: 000

  BAT Trigger Time: 181845952   [s; MET]
      Trigger Stop: 181846016   [s; MET]
               UTC: 2006-10-06T16:45:50.510340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 111.090082281944   Dec: -79.2018093198341  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.5
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    12.5

  Analysis Position:   [ source = BAT ]
    RA: 111.090082281944   Dec: -79.2018093198341  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 111.008488864886   Dec: -79.1989479464266  [deg; J2000]  
        { 07h 24m 02.0s , -79d 11' 56.2" }
         +/- 1.80323844481607 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.875222015252339 [arcmin] (formal 1-sigma fit error)
    SNR: 13.10171519202
 
  Angular difference between the analysis and refined position is 0.933241 arcmin
 
  Partial Coding Fraction: 0.734375    [ including projection effects ]

  Duration
     T90: 129.791999965906 +/- 30.6774079649829
        Measured from: -22.727999985218
                   to: 107.063999980688     [s; relative to TRIGTIME]
     T50: 55.7439999878407 +/- 17.5420865156706
        Measured from: -22.3280000090599
                   to: 33.4159999787807     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -23.2039999961853     
                   to: -22.2039999961853     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -23.2879999876022     
                   to: 137.719999998808     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.799779   0.905910   0.561519   0.187666
           0.067683   0.070024   0.061799   0.054791 [error]
 Peak      0.109162   0.212003   0.263466   0.099901
           0.006651   0.008203   0.008982   0.007545 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  161.008  -23.288  137.720
T90   129.792  -22.728  107.064
T50    55.744  -22.328   33.416
Peak    1.000  -23.204  -22.204
 
 
====== 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      -1.736    -0.163      0.159       -           -               -         9.60e-04     -9.19e-05          9.05e-05      61.120   57
CPL     -1.738    -0.161      0.163     9999.360    -9999.350      -9999.360      9.60e-04     -5.10e-04          9.96e-04      61.120   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -0.858     -0.072     0.072       -           -               -         4.60e-02     -1.83e-03          1.83e-03      47.910   57
CPL     -0.851     -0.072     0.073     9999.350    -9999.350      -9999.350      4.63e-02     -1.82e-03          1.44e-02      47.910   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   2.46e-07  3.92e-07  4.71e-07  1.10e-06  1.43e-06  2.21e-06   erg/cm2
      90%_error_low -3.34e-08 -3.36e-08 -6.15e-08 -2.74e-07 -1.41e-07 -3.34e-07   erg/cm2
      90%_error_hi   3.45e-08  3.36e-08  6.16e-08  3.30e-07  1.43e-07  3.79e-07   erg/cm2
Peak flux       PL   4.64e-04  5.68e-03  6.31e-02  6.26e+00  3.27e-01  6.25e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A   -2.14e-01 -1.16e-02 -1.29e-01   ph/cm2/s
      90%_error_hi      N/A       N/A       N/A    3.46e-01  2.05e-02  4.34e-01   ph/cm2/s
 
Fluence        CPL   2.47e-07  3.91e-07  4.71e-07  1.15e-06  1.43e-06  2.24e-06   erg/cm2
      90%_error_low -3.40e-08 -3.29e-08 -6.45e-08 -7.27e-07 -1.67e-07 -7.57e-07   erg/cm2
      90%_error_hi   3.43e-08  3.84e-08  6.55e-08  1.42e-07  1.09e-07  1.78e-07   erg/cm2
Peak flux      CPL   1.02e+00  1.52e+00  1.68e+00  3.43e+00  5.27e+00  7.63e+00   ph/cm2/s
      90%_error_low -1.17e-01 -6.52e-02 -7.19e-02 -8.71e-01 -2.07e-01 -8.68e-01   ph/cm2/s
      90%_error_hi   7.04e-02  6.09e-02  8.92e-02  2.25e-01  2.10e-01  3.77e-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
  111.0085   -79.1989   0.0146    33.6466   -20.1602         1.3699971     13.102 TRIG_00232585                 
 
Foreground time interval of the image:
 -7.899  72.301 (delta_t =  80.200 [sec])
Background time interval of the image:




    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  -23.288 sec. to  137.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.73614     ( -0.16265   0.158755 )
Norm@50keV  : 9.60203E-04    ( -9.19358e-05   9.05229e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.12 using 59 PHA bins.
# Reduced chi-squared =          1.072 for     57 degrees of freedom 
# Null hypothesis probability =   3.302322e-01
 
Photon flux (15-150 keV)    in 161 sec: 0.129184 ( -0.011154  0.01117 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.42789e-06 ( -1.41434e-07  1.43395e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -23.288 sec. to  137.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.73796     ( -0.16161   0.161574 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 9.60244E-04    ( -0.000510811   0.000995504 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.12 using 59 PHA bins.
# Reduced chi-squared =          1.092 for     56 degrees of freedom 
# Null hypothesis probability =   2.971032e-01
 
Photon flux (15-150 keV)    in 161 sec: 0.129372 ( -0.011536  0.011188 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.43181e-06 ( -1.66825e-07  1.09448e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from  -23.204 sec. to  -22.204 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.858265     ( -0.0715141   0.0722173 )
Norm@50keV  : 4.59502E-02    ( -0.00183377   0.00182691 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.91 using 59 PHA bins.
# Reduced chi-squared =         0.8406 for     57 degrees of freedom 
# Null hypothesis probability =   7.988878e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.326929 0.291927 0.259697 0.231284 0.206441 0.184882 0.166298 0.150369 0.136775 0.125210 0.115390 0.107054 9.99746E-02 9.39515E-02 8.88139E-02 8.44174E-02 8.06408E-02 7.73827E-02 7.45596E-02 7.21019E-02 6.99525E-02 6.80638E-02 6.63967E-02 6.49187E-02 6.36025E-02 6.24255E-02 6.13689E-02 6.04167E-02 5.95555E-02 5.87737E-02 5.80619E-02 5.74116E-02 5.68158E-02 5.62683E-02 5.57640E-02 5.52981E-02 5.48668E-02 5.44665E-02 5.40943E-02 5.37473E-02 5.34233E-02 5.31201E-02 5.28360E-02 5.25692E-02 5.23184E-02 5.20820E-02 5.18591E-02 5.16485E-02 5.14493E-02 5.12607E-02 5.10817E-02 5.09119E-02 5.07504E-02 5.05966E-02 5.04502E-02 5.03094E-02 5.01732E-02 5.00416E-02 4.97930E-02 4.95603E-02 4.93424E-02 4.91383E-02 4.89469E-02 4.87674E-02 4.85989E-02 4.84407E-02 4.82919E-02 4.81520E-02 4.78985E-02 4.76729E-02 4.47484E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.24312e-07 ( -2.27669e-08  2.28299e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -23.204 sec. to  -22.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.851463     ( -0.071993   0.0728474 )
Epeak [keV] : 9999.35      ( -9999.34 -9999.34 )
Norm@50keV  : 4.62650E-02    ( -0.00181688   0.0143756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.91 using 59 PHA bins.
# Reduced chi-squared =         0.8555 for     56 degrees of freedom 
# Null hypothesis probability =   7.707490e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.27153 ( -0.20711  0.2096 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.24047e-07 ( -1.95484e-08  2.2176e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 129.792 sec.
Hardness ratio (energy fluence ratio) = 1.2007152532

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

    S(15-50 keV)  = 6.38735e-07
S(50-150 keV) = 7.891586e-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 = 6.247943294885763E-01, IMY = 2.293872336826165E-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:

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

    Time interval of the image:
-7.899420 72.300590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4773 -40.4255    4.6  27.8 -103.4   0.2869   2.5    8.1	Vela X-1                      
170.5553 -60.5457    9.7  43.4  -58.9   0.3800   1.2    8.4	Cen X-3                       
111.0084 -79.1990    0.9  33.6  -20.2   1.3697  13.1 ------	UNKNOWN                       
160.1598 -48.6738    2.6  41.2  -78.4   1.5616   4.3 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
127.100590 963.047100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6175 -40.4461   10.3  39.9 -142.8  -0.7464  -1.1    7.7	Vela X-1                      
170.6626 -60.5629    7.1  25.6  -93.1   0.8351   1.6   10.8	Cen X-3                       
186.8562 -62.7648    2.5  26.6  -75.1   2.4390   4.6    5.5	GX 301-2                      
264.6270 -44.4243  775.6  55.4  -15.0   0.0234   0.0    5.2	4U 1735-44                    
 83.8118 -39.4433    2.6  41.2  155.2   3.7161   4.5 ------	UNKNOWN                       
287.5201 -44.0382    3.9  56.7    4.7   6.7163   3.0 ------	UNKNOWN                       
137.0914 -54.4836    2.9  26.2 -137.0   1.5810   4.0 ------	UNKNOWN                       
117.2236 -21.6582    3.7  57.6 -165.5   5.9702   3.2 ------	UNKNOWN                       
258.5652 -43.8144    4.3  55.5  -20.4   4.7161   2.7 ------	UNKNOWN                       
243.9088 -43.4286    4.4  54.4  -33.2   6.8007   2.6 ------	UNKNOWN                       
156.1015 -38.0673    3.0  44.8 -120.0   7.0188   3.8 ------	UNKNOWN