Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 22:06:39 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger118248
======================================================================

  Trigger: 00118248      Segment: 000

  BAT Trigger Time: 137198597.824   [s; MET]
      Trigger Stop: 137198606.016   [s; MET]
               UTC: 2005-05-07T22:43:18.311680    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 48.0554888617114   Dec: -11.0734801541787  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9
     Image Trigger?:     NO
     Rate S/N Ratio:     8.06225774829855  [ if not an image trigger ]
     Image S/N Ratio:    9

  Analysis Position:   [ source = BAT ]
    RA: 48.0554888617114   Dec: -11.0734801541787  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 48.0641495324214   Dec: -11.0498494067537  [deg; J2000]  
        { 03h 12m 15.4s , -11d 02' 59.5" }
         +/- 1.87148122090519 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.852396496074431 [arcmin] (formal 1-sigma fit error)
    SNR: 12.4245877911305
 
  Angular difference between the analysis and refined position is 1.506775 arcmin
 
  Partial Coding Fraction: 0.6484375    [ including projection effects ]

  Duration
     T90: 15 +/- 5.8309518948453
        Measured from: -2.82400000095367
                   to: 12.1759999990463     [s; relative to TRIGTIME]
     T50: 6 +/- 5
        Measured from: 2.17599999904633
                   to: 8.17599999904633     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.17599999904633     
                   to: 3.17599999904633     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.82400000095367     
                   to: 13.1759999990463     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.125771   0.226806   0.150513  -0.003692
           0.022666   0.023852   0.020633   0.016990 [error]
 Peak      0.016637   0.016049   0.008804   0.006127
           0.005406   0.005518   0.004943   0.003793 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   18.000   -4.824   13.176
T90    15.000   -2.824   12.176
T50     6.000    2.176    8.176
Peak    1.000    2.176    3.176
 
 
====== 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: 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      -1.598    -0.208      0.203       -           -               -         1.84e-03     -2.60e-04          2.58e-04      75.620   57
CPL      0.528    -1.067      1.373       55.492      -8.160        13.655      2.46e-02     -2.46e-02          1.01e-01      61.470   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      -1.472     -0.663     0.642       -           -               -         3.04e-03     -1.11e-03          1.06e-03      70.290   57
CPL     -1.480     -2.093     1.166     9999.310      N/A           N/A         3.05e-03        N/A               N/A         70.300   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   4.64e-08  8.03e-08  1.06e-07  2.85e-07  3.10e-07  5.18e-07   erg/cm2
      90%_error_low -8.85e-09 -1.07e-08 -1.90e-08 -9.01e-08 -4.64e-08 -1.11e-07   erg/cm2
      90%_error_hi   9.21e-09  1.07e-08  1.91e-08  1.13e-07  4.71e-08  1.30e-07   erg/cm2
Peak flux       PL   1.22e-01  1.25e-01  9.00e-02  1.04e-01  3.77e-01  4.41e-01   ph/cm2/s
      90%_error_low -6.68e-02 -4.72e-02 -4.10e-02 -7.12e-02 -1.31e-01 -1.53e-01   ph/cm2/s
      90%_error_hi   7.69e-02  4.50e-02  3.91e-02  1.28e-01  1.31e-01  1.56e-01   ph/cm2/s
 
Fluence        CPL   3.47e-08  1.00e-07  1.12e-07  3.23e-08  2.73e-07  2.79e-07   erg/cm2
      90%_error_low -1.06e-08 -1.47e-08 -2.47e-08 -2.15e-08 -4.39e-08 -4.81e-08   erg/cm2
      90%_error_hi   1.09e-08  1.53e-08  2.41e-08  4.98e-08  4.72e-08  6.32e-08   erg/cm2
Peak flux      CPL   1.26e-01  1.25e-01  8.88e-02  1.03e-01  3.78e-01  4.43e-01   ph/cm2/s
      90%_error_low -1.26e-01 -4.70e-02 -8.88e-02     N/A   -1.31e-01 -2.65e-01   ph/cm2/s
      90%_error_hi   3.71e-02  7.98e-02  -2.30e-02     N/A    1.30e-01  1.51e-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
   48.0641   -11.0498   0.0154    25.9423   -60.7536         0.5340043     12.425 TRIG_00118248                 
 
Foreground time interval of the image:
 -4.824  13.176 (delta_t =  18.000 [sec])
Background time interval of the image:
-299.824  -4.824 (delta_t = 295.000 [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   -4.824 sec. to   13.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.59836     ( -0.208686   0.202965 )
Norm@50keV  : 1.83989E-03    ( -0.000260008   0.000257836 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.62 using 59 PHA bins.
# Reduced chi-squared =          1.327 for     57 degrees of freedom 
# Null hypothesis probability =   5.001712e-02
 
Photon flux (15-150 keV)    in 18 sec: 0.236317 ( -0.031382  0.031406 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.09865e-07 ( -4.63937e-08  4.71389e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -4.824 sec. to   13.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.528336     ( -1.06681   1.37323 )
Epeak [keV] : 55.4925      ( -8.1596 13.6553 )
Norm@50keV  : 2.45765E-02    ( -0.0245765   0.101129 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.47 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     56 degrees of freedom 
# Null hypothesis probability =   2.864145e-01
 
Photon flux (15-150 keV)    in 18 sec: 0.222884 ( -0.031668  0.031826 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.7349e-07 ( -4.39427e-08  4.71533e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.176 sec. to    3.176 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47195     ( -0.662681   0.641648 )
Norm@50keV  : 3.04409E-03    ( -0.00110617   0.00106321 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.29 using 59 PHA bins.
# Reduced chi-squared =          1.233 for     57 degrees of freedom 
# Null hypothesis probability =   1.110391e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.377237 ( -0.130742  0.130956 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.90188e-08 ( -1.11995e-08  1.14835e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.176 sec. to    3.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.1772     ( -1.39587   1.86281 )
Epeak [keV] : 65.6980      (   )
Norm@50keV  : 1.24591E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.09 using 59 PHA bins.
# Reduced chi-squared =          1.252 for     56 degrees of freedom 
# Null hypothesis probability =   9.759816e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.378163 ( -0.130592  0.130418 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.91837e-08 ( -1.35209e-08  1.2009e-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 = 2.376806277646026E-01, IMY = 4.244722018507173E-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:
-299.824000 -4.824000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 16.1288 -39.6754    2.1  14.8  100.8   0.8241   5.6 ------	UNKNOWN                       
  1.9698 -30.8589    3.1  22.0  142.2   0.6226   3.7 ------	UNKNOWN                       
  9.0864 -16.0790    2.3  20.4 -172.4   0.7989   4.9 ------	UNKNOWN                       
 42.6392 -29.4030    2.9  13.7  -14.5   0.6368   4.0 ------	UNKNOWN                       
 59.0251 -17.7979    2.1  31.0  -36.4   1.0376   5.4 ------	UNKNOWN                       
 59.2701   2.8607    2.9  43.7  -63.8   3.7377   4.0 ------	UNKNOWN

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

    Time interval of the image:
-4.824000 13.176000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 33.3237 -22.9313    2.3   7.6  -64.7   0.1694   5.1 ------	UNKNOWN                       
 48.0642 -11.0499    0.9  25.9  -60.8   0.5341  12.4 ------	UNKNOWN                       
 55.3226 -10.0975    2.1  32.0  -52.6   0.2846   5.6 ------	UNKNOWN                       
 25.8437  15.3308    2.4  43.3 -115.9   0.7335   4.8 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
-299.824000 32.205500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  1.9735 -30.8702    2.8  22.0  142.1   0.7663   4.2 ------	UNKNOWN                       
 42.6186 -29.3754    2.9  13.7  -14.6   0.6856   4.0 ------	UNKNOWN                       
 59.0164 -17.8188    2.1  31.0  -36.4   1.1316   5.6 ------	UNKNOWN