Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 18:10:56 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger200638
======================================================================

  Trigger: 00200638      Segment: 000

  BAT Trigger Time: 163298951.68   [s; MET]
      Trigger Stop: 163298952.704   [s; MET]
               UTC: 2006-03-06T00:49:10.626240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 41.098878206475   Dec: -2.15303951917031  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    19.98
     Image Trigger?:     NO
     Rate S/N Ratio:     60.7618301238533  [ if not an image trigger ]
     Image S/N Ratio:    19.98

  Analysis Position:   [ source = BAT ]
    RA: 41.098878206475   Dec: -2.15303951917031  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 41.0981070281877   Dec: -2.16283013767294  [deg; J2000]  
        { 02h 44m 23.5s , -02d 09' 46.2" }
         +/- 1.04600535303472 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.47078252953716 [arcmin] (formal 1-sigma fit error)
    SNR: 28.5241557032444
 
  Angular difference between the analysis and refined position is 0.589254 arcmin
 
  Partial Coding Fraction: 0.5    [ including projection effects ]

  Duration
     T90: 60.9399999976158 +/- 3.36301769178435
        Measured from: -0.872000008821487
                   to: 60.0679999887943     [s; relative to TRIGTIME]
     T50: 42.8040000200272 +/- 0.631404789502995
        Measured from: 0.607999980449677
                   to: 43.4120000004768     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.183999985456467     
                   to: 1.18399998545647     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.35199999809265     
                   to: 66.919999986887     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.084990   1.403422   0.884060   0.188634
           0.054699   0.057566   0.050950   0.045636 [error]
 Peak      0.158102   0.270729   0.225059   0.057147
           0.010502   0.012150   0.011414   0.008273 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   68.272   -1.352   66.920
T90    60.940   -0.872   60.068
T50    42.804    0.608   43.412
Peak    1.000    0.184    1.184
 
 
====== 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      -1.758    -0.091      0.090       -           -               -         3.42e-03     -1.82e-04          1.81e-04      65.950   57
CPL     -1.254    -0.385      0.427       69.380     -13.665        69.062      6.30e-03     -2.30e-03          4.20e-03      60.820   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -1.388     -0.085     0.085       -           -               -         4.97e-02     -2.56e-03          2.56e-03      72.580   57
CPL     -0.819     -0.353     0.383      111.534     -25.349        90.544      9.31e-02     -2.94e-02          4.74e-02      64.670   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   3.80e-07  5.96e-07  7.05e-07  1.62e-06  2.15e-06  3.30e-06   erg/cm2
      90%_error_low -3.08e-08 -3.01e-08 -5.05e-08 -2.32e-07 -1.18e-07 -2.77e-07   erg/cm2
      90%_error_hi   3.15e-08  3.00e-08  5.06e-08  2.56e-07  1.19e-07  2.96e-07   erg/cm2
Peak flux       PL   1.84e+00  1.98e+00  1.51e+00  1.89e+00  6.04e+00  7.22e+00   ph/cm2/s
      90%_error_low -1.68e-01 -1.15e-01 -9.17e-02 -2.24e-01 -3.22e-01 -3.75e-01   ph/cm2/s
      90%_error_hi   1.73e-01  1.14e-01  9.12e-02  2.41e-01  3.23e-01  3.76e-01   ph/cm2/s
 
Fluence        CPL   3.52e-07  6.27e-07  7.12e-07  7.55e-07  2.05e-06  2.45e-06   erg/cm2
      90%_error_low -3.68e-08 -3.81e-08 -5.45e-08 -3.09e-07 -1.39e-07 -3.41e-07   erg/cm2
      90%_error_hi   3.73e-08  3.88e-08  5.45e-08  5.70e-07  1.39e-07  5.79e-07   erg/cm2
Peak flux      CPL   1.63e+00  2.07e+00  1.61e+00  1.10e+00  5.92e+00  6.41e+00   ph/cm2/s
      90%_error_low -2.05e-01 -1.31e-01 -1.11e-01 -3.01e-01 -3.31e-01 -4.58e-01   ph/cm2/s
      90%_error_hi   2.11e-01  1.33e-01  1.13e-01  4.30e-01  3.31e-01  5.27e-01   ph/cm2/s
 
======================================================================




Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   41.0981    -2.1628   0.0067    40.8715  -164.2708         1.9746467     28.524 TRIG_00200638                 
 
Foreground time interval of the image:
 -1.352  15.021 (delta_t =  16.373 [sec])
Background time interval of the image:
-299.680  -1.352 (delta_t = 298.328 [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   -1.352 sec. to   66.920 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.75833     ( -0.0914572   0.0903316 )
Norm@50keV  : 3.41591E-03    ( -0.000182041   0.000180982 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.95 using 59 PHA bins.
# Reduced chi-squared =          1.157 for     57 degrees of freedom 
# Null hypothesis probability =   1.949467e-01
 
Photon flux (15-150 keV)    in 68.27 sec: 0.463337 ( -0.023694  0.023733 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.15119e-06 ( -1.18183e-07  1.18931e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -1.352 sec. to   66.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25447     ( -0.384544   0.426583 )
Epeak [keV] : 69.3800      ( -13.6638 69.0629 )
Norm@50keV  : 6.29540E-03    ( -0.00230502   0.00419765 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.82 using 59 PHA bins.
# Reduced chi-squared =          1.086 for     56 degrees of freedom 
# Null hypothesis probability =   3.064240e-01
 
Photon flux (15-150 keV)    in 68.27 sec: 0.450694 ( -0.025532  0.025513 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.05381e-06 ( -1.39155e-07  1.39401e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model
Time interval is from    0.184 sec. to    1.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38761     ( -0.0853585   0.0851773 )
Norm@50keV  : 4.97478E-02    ( -0.00255769   0.00255696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.58 using 59 PHA bins.
# Reduced chi-squared =          1.273 for     57 degrees of freedom 
# Null hypothesis probability =   7.993151e-02
 
Photon flux (15-150 keV)    in 1 sec: 6.04164 ( -0.32231  0.32272 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.81992e-07 ( -2.67944e-08  2.687e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.184 sec. to    1.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.818999     ( -0.352749   0.382876 )
Epeak [keV] : 111.534      ( -25.3485 90.5436 )
Norm@50keV  : 9.30952E-02    ( -0.0293755   0.0473682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.67 using 59 PHA bins.
# Reduced chi-squared =          1.155 for     56 degrees of freedom 
# Null hypothesis probability =   1.997976e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.91524 ( -0.33119  0.33149 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.69678e-07 ( -2.84836e-08  2.83572e-08 ) ergs/cm2
 

Time-resolved spectra




Distribution

T90 vs. Hardness ratio plot

T90                                   = 60.94 sec.
Hardness ratio (energy fluence ratio) = 1.18241537002

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

S(15-50 keV)  = 9.758241e-07
S(50-150 keV) = 1.1753772e-06

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 = -8.329529531271376E-01, IMY = 2.345904532161560E-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:
-299.680000 -1.352000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
328.5110  52.3921    2.5  47.4  -26.1   1.8385   4.7 ------	UNKNOWN                       
 13.4967  20.0521    2.4  26.6 -103.4   1.3460   4.9 ------	UNKNOWN                       
309.4889  55.2458    3.0  57.4  -18.7   3.1935   3.9 ------	UNKNOWN                       
349.2306  28.5827    2.9  39.6  -66.2   2.5525   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-1.352000 15.020600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 41.0981  -2.1628    0.4  40.9 -164.3   1.9746  28.5 ------	UNKNOWN                       
353.8817  34.0637    2.3  33.8  -60.4   0.3648   5.1 ------	UNKNOWN                       
354.0223  18.6402    2.2  41.2  -82.8   0.9321   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
76.620590 302.461700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 15.7641 -12.7100    2.7  27.2 -108.5   0.9210   4.3 ------	UNKNOWN                       
  8.8909   2.5056    2.6  32.5  -76.4   1.1738   4.4  554.1	UNKNOWN