Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 15:16:43 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger357498
======================================================================

  Trigger: 00357498      Segment: 000

  BAT Trigger Time: 269371544.064   [s; MET]
      Trigger Stop: 269371544.32   [s; MET]
               UTC: 2009-07-15T17:25:39.150560    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 152.121935465376   Dec: 9.99748569935098  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.85
     Image Trigger?:     NO
     Rate S/N Ratio:     57.835974963685  [ if not an image trigger ]
     Image S/N Ratio:    9.85

  Analysis Position:   [ source = BAT ]
    RA: 152.121935465376   Dec: 9.99748569935098  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 152.11515298902   Dec: 10.0054080605702  [deg; J2000]  
        { 10h 08m 27.6s , +10d 00' 19.5" }
         +/- 2.63985917847115 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.4183581684834 [arcmin] (formal 1-sigma fit error)
    SNR: 7.60081480362925
 
  Angular difference between the analysis and refined position is 0.621741 arcmin
 
  Partial Coding Fraction: 0.2207031    [ including projection effects ]

  Duration
     T90: 64 +/- 22.6274169979695
        Measured from: -15.0640000104904
                   to: 48.9359999895096     [s; relative to TRIGTIME]
     T50: 48 +/- 16
        Measured from: -15.0640000104904
                   to: 32.9359999895096     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -7.56400001049042     
                   to: -6.56400001049042     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.0640000104904     
                   to: 48.9359999895096     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.210651   0.442707   0.397521   0.167566
           0.094032   0.098151   0.087631   0.078305 [error]
 Peak     -0.017494   0.008448   0.016077   0.001065
           0.011992   0.011552   0.010758   0.008812 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   64.000  -15.064   48.936
T90    64.000  -15.064   48.936
T50    48.000  -15.064   32.936
Peak    1.000   -7.564   -6.564
 
 
====== 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      -1.061    -0.421      0.476       -           -               -         1.41e-03     -3.48e-04          3.31e-04      57.780   57
CPL     -1.068    -0.411      0.547     9999.300    -9999.300      -9999.300      1.42e-03     -3.18e-04          2.24e-03      57.790   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      -0.347      0.347     0.347       -           -               -         1.65e-03     -1.65e-03          2.38e-03      59.610   57
CPL      8.053    -16.494    -8.053       81.405     -28.664       117.997      1.32e+00     -1.32e+00          3.63e+02      57.860   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   7.64e-08  1.84e-07  3.53e-07  1.65e-06  9.54e-07  2.27e-06   erg/cm2
      90%_error_low -3.69e-08 -5.95e-08 -8.43e-08 -7.76e-07 -2.18e-07 -8.25e-07   erg/cm2
      90%_error_hi   4.45e-08  5.61e-08  8.22e-08  1.23e-06  2.19e-07  1.21e-06   erg/cm2
Peak flux       PL   2.40e-02  4.43e-02  7.20e-02  2.52e-01  2.03e-01  4.01e-01   ph/cm2/s
      90%_error_low -2.40e-02 -4.43e-02 -7.20e-02 -2.52e-01 -2.03e-01 -4.01e-01   ph/cm2/s
      90%_error_hi   1.08e-01  9.95e-02  7.41e-02  1.06e+00  2.62e-01  9.66e-01   ph/cm2/s
 
Fluence        CPL   7.64e-08  1.83e-07  3.43e-07  1.69e-06  9.57e-07  2.26e-06   erg/cm2
      90%_error_low    N/A    -7.40e-08 -9.78e-08 -1.21e-06 -2.74e-07 -1.16e-06   erg/cm2
      90%_error_hi     N/A     6.02e-08  1.21e-07  1.23e-06  2.73e-07  2.16e-06   erg/cm2
Peak flux      CPL   3.40e-04  2.57e-02  1.56e-01  1.54e-02  1.90e-01  1.89e-01   ph/cm2/s
      90%_error_low -3.40e-04 -2.57e-02 -1.24e-01     N/A   -1.90e-01 -1.89e-01   ph/cm2/s
      90%_error_hi   7.55e-02  1.23e-01  1.12e-01     N/A    2.17e-01  4.07e-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
  152.1152    10.0054   0.0253    47.1921  -145.7587         1.5176116      7.601 TRIG_00357498                 
 
Foreground time interval of the image:
-15.064  48.936 (delta_t =  64.000 [sec])
Background time interval of the image:
-239.064 -15.064 (delta_t = 224.000 [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  -15.064 sec. to   48.936 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06084     ( -0.420964   0.476325 )
Norm@50keV  : 1.40789E-03    ( -0.000347816   0.000331335 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.78 using 59 PHA bins.
# Reduced chi-squared =          1.014 for     57 degrees of freedom 
# Null hypothesis probability =   4.462443e-01
 
Photon flux (15-150 keV)    in 64 sec: 0.162742 ( -0.040865  0.041461 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.54291e-07 ( -2.18339e-07  2.18552e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -15.064 sec. to   48.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06836     ( -0.412082   0.545731 )
Epeak [keV] : 9999.30      ( -9999.36 -9999.36 )
Norm@50keV  : 1.41927E-03    ( -0.000316964   0.00224114 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.79 using 59 PHA bins.
# Reduced chi-squared =          1.032 for     56 degrees of freedom 
# Null hypothesis probability =   4.088315e-01
 
Photon flux (15-150 keV)    in 64 sec: 0.165354 ( -0.054527  0.050188 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.5737e-07 ( -2.73962e-07  2.73409e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -7.564 sec. to   -6.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.346917     ( 0.378549   0.378549 )
Norm@50keV  : 1.65320E-03    ( -0.00166575   0.00236594 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.61 using 59 PHA bins.
# Reduced chi-squared =          1.046 for     57 degrees of freedom 
# Null hypothesis probability =   3.807502e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.203161 ( -0.203161  0.262458 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.40968e-08 ( 1  2.45977e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -7.564 sec. to   -6.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 9.99947     ( -18.4408   -9.99995 )
Epeak [keV] : 79.5069      ( -26.7627 119.899 )
Norm@50keV  : 5.19084    ( -5.08152   359.292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.72 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     56 degrees of freedom 
# Null hypothesis probability =   4.114903e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.189943 ( -0.189943  0.216917 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20328e-08 ( -1.7046e-08  2.37434e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 64.0 sec.
Hardness ratio (energy fluence ratio) = 1.91747604498

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

    S(15-50 keV)  = 2.6024018e-07
S(50-150 keV) = 6.940412e-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 = -8.924821866364759E-01, IMY = 6.074714549047846E-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:
-239.064000 -15.064000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
231.6069  79.6115    2.5  33.6    7.6   0.9387   4.7 ------	UNKNOWN                       
165.9848  12.9071    2.8  39.7 -162.9   0.9645   4.1 ------	UNKNOWN                       
163.2789  -3.9820    2.3  56.7 -165.0   3.5291   5.1 ------	UNKNOWN                       
 71.8706  66.8392    2.8  51.2  -35.3   2.4393   4.1 ------	UNKNOWN                       
144.1703  10.2623    3.8  50.6 -136.4   2.4078   3.0 ------	UNKNOWN

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

    Time interval of the image:
-15.064000 48.936000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
152.1151  10.0054    1.5  47.2 -145.8   1.5175   7.6 ------	UNKNOWN                       
149.1845  10.8201    2.0  47.7 -141.8   1.3409   5.9 ------	UNKNOWN                       
120.4759  43.3181    1.7  41.1  -82.5   2.3135   6.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
758.136600 962.996000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4723  35.3137    5.4   4.5  119.6   0.3988   2.2    1.9	Her X-1                       
299.5933  35.2016    0.4  36.5   32.4   8.0639  27.0    0.1	Cyg X-1                       
308.0981  40.9447    2.5  41.0   20.2   1.4787   4.6    0.7	Cyg X-3                       
326.1739  38.3991    5.5  54.8   16.5   2.2558   2.1    4.6	Cyg X-2                       
200.4556  11.3634    2.3  54.6 -155.9   3.2613   5.1 ------	UNKNOWN