GRB081203A: Summary Image Light curves Spectra Distribution Others

Analysis Summary

Notes:

• 1) No attempt has been made to eliminate the non-significant decimal places.
• 2) This batgrbproduct analysis is done using the HEASARC data.
• 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 20:11:22 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger336489
======================================================================

  Trigger: 00336489      Segment: 000

  BAT Trigger Time: 250005434.88   [s; MET]
      Trigger Stop: 250005435.904   [s; MET]
               UTC: 2008-12-03T13:57:11.575340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 233.033331525279   Dec: 63.4983389938113  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.56
     Image Trigger?:     NO
     Rate S/N Ratio:     14.5258390463339  [ if not an image trigger ]
     Image S/N Ratio:    7.56

  Analysis Position:   [ source = BAT ]
    RA: 233.033331525279   Dec: 63.4983389938113  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 233.071076172623   Dec: 63.5154418460716  [deg; J2000]  
        { 15h 32m 17.1s , +63d 30' 55.6" }
         +/- 1.05533052790578 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.312071243511997 [arcmin] (formal 1-sigma fit error)
    SNR: 28.164771700875
 
  Angular difference between the analysis and refined position is 1.440012 arcmin
 
  Partial Coding Fraction: 0.5703125    [ including projection effects ]

  Duration
     T90: 223 +/- 89.9888882029331
        Measured from: -14.8799999952316
                   to: 208.120000004768     [s; relative to TRIGTIME]
     T50: 43 +/- 4.47213595499958
        Measured from: 9.12000000476837
                   to: 52.1200000047684     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 31.1200000047684     
                   to: 32.1200000047684     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -68.8799999952316     
                   to: 405.120000004768     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.205891   4.451201   3.547946   0.964441
           0.113921   0.119655   0.106345   0.092897 [error]
 Peak      0.069478   0.127489   0.117334   0.042900
           0.007326   0.008244   0.007925   0.006367 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  474.000  -68.880  405.120
T90   223.000  -14.880  208.120
T50    43.000    9.120   52.120
Peak    1.000   31.120   32.120
 
 
====== 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      -1.426    -0.060      0.060       -           -               -         1.72e-03     -5.39e-05          5.39e-05      50.960   57
CPL     -1.392    -0.090      0.183      982.947    -982.947      -982.947      1.78e-03     -1.12e-04          3.53e-04      51.100   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      -1.174     -0.117     0.118       -           -               -         2.41e-02     -1.66e-03          1.66e-03      62.450   57
CPL     -0.817     -0.405     0.501      177.081     -74.190      -177.081      3.57e-02     -1.25e-02          2.54e-02      60.630   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   9.70e-07  1.87e-06  2.78e-06  8.91e-06  7.83e-06  1.45e-05   erg/cm2
      90%_error_low -6.16e-08 -6.87e-08 -1.08e-07 -7.77e-07 -2.63e-07 -8.36e-07   erg/cm2
      90%_error_hi   6.32e-08  6.84e-08  1.07e-07  8.30e-07  2.63e-07  8.78e-07   erg/cm2
Peak flux       PL   7.25e-01  8.86e-01  7.86e-01  1.20e+00  2.82e+00  3.60e+00   ph/cm2/s
      90%_error_low -9.39e-02 -7.22e-02 -6.24e-02 -1.89e-01 -1.99e-01 -2.63e-01   ph/cm2/s
      90%_error_hi   9.78e-02  7.15e-02  6.20e-02  2.11e-01  1.99e-01  2.66e-01   ph/cm2/s
 
Fluence        CPL   9.73e-07  1.86e-06  2.77e-06  9.06e-06  7.84e-06  1.46e-05   erg/cm2
      90%_error_low -8.48e-08 -5.66e-08 -1.11e-07 -2.43e-06 -2.86e-07 -2.57e-06   erg/cm2
      90%_error_hi   6.52e-08  7.27e-08  1.28e-07  4.43e-07  2.66e-07  4.13e-07   erg/cm2
Peak flux      CPL   6.73e-01  9.14e-01  8.17e-01  8.12e-01  2.78e+00  3.22e+00   ph/cm2/s
      90%_error_low -1.13e-01 -8.07e-02 -7.34e-02 -3.05e-01 -2.04e-01 -3.70e-01   ph/cm2/s
      90%_error_hi   1.16e-01  8.25e-02  7.47e-02  4.58e-01  2.04e-01  5.20e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  233.0711    63.5154   0.0068    35.6574   167.4005         4.1148731     28.165 TRIG_00336489                 
 
Foreground time interval of the image:
-68.880  17.221 (delta_t =  86.101 [sec])
Background time interval of the image:
-252.779 -68.880 (delta_t = 183.899 [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

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

Spectra

Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from  -68.880 sec. to  405.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.42589     ( -0.060377   0.0604575 )
Norm@50keV  : 1.71813E-03    ( -5.38955e-05   5.38951e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.96 using 59 PHA bins.
# Reduced chi-squared =         0.8940 for     57 degrees of freedom 
# Null hypothesis probability =   6.998498e-01
 
Photon flux (15-150 keV)    in 474 sec: 0.210504 ( -0.007221  0.007251 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.82977e-06 ( -2.62863e-07  2.63395e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -68.880 sec. to  405.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.42273     ( -0.0893109   0.183379 )
Epeak [keV] : 9999.01      ( -9999.02 -9999.02 )
Norm@50keV  : 1.72400E-03    ( -5.4096e-05   0.000410244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.97 using 59 PHA bins.
# Reduced chi-squared =         0.9101 for     56 degrees of freedom 
# Null hypothesis probability =   6.653283e-01
 
Photon flux (15-150 keV)    in 474 sec: 0.210731 ( -0.008014  0.007325 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.83768e-06 ( -2.86096e-07  2.65549e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   31.120 sec. to   32.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17416     ( -0.117085   0.118353 )
Norm@50keV  : 2.40661E-02    ( -0.00165927   0.00165922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.45 using 59 PHA bins.
# Reduced chi-squared =          1.096 for     57 degrees of freedom 
# Null hypothesis probability =   2.886352e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.81503 ( -0.19926  0.19947 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.46003e-07 ( -1.87603e-08  1.88714e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   31.120 sec. to   32.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.816771     ( -0.405032   0.50081 )
Epeak [keV] : 177.081      ( -74.192 -177.083 )
Norm@50keV  : 3.57496E-02    ( -0.0124747   0.0254088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.63 using 59 PHA bins.
# Reduced chi-squared =          1.083 for     56 degrees of freedom 
# Null hypothesis probability =   3.126264e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.77948 ( -0.2045  0.20443 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.40686e-07 ( -2.03173e-08  2.01515e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 223.0 sec.
Hardness ratio (energy fluence ratio) = 1.48881223926

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

S(15-50 keV)  = 2.8354906e-06
S(50-150 keV) = 4.99426e-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 = -7.001689677475702E-01, IMY = -1.564997302572309E-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:
-252.779400 -68.880000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2745  35.2649   17.4  51.0 -152.1   0.2475   0.7   10.1	Her X-1                       
165.5738   1.5979    2.3  43.1   -9.0   1.0180   5.1 ------	UNKNOWN                       
221.4422   9.7261    3.6  41.1  -98.0   2.1458   3.2 ------	UNKNOWN                       

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

Time interval of the image:
-68.880000 17.220600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3746  35.2908   25.7  51.0 -152.2  -0.1313  -0.4    5.1	Her X-1                       
233.0711  63.5154    0.4  35.7  167.4   4.1147  28.2 ------	UNKNOWN                       
192.4021  14.1274    2.3  25.0  -52.3   0.5677   5.0 ------	UNKNOWN                       
166.5973 -16.0108    2.0  58.9  -19.2   3.5342   5.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
72.420600 804.020600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6119  35.2596    7.8  31.2 -109.3   0.7597   1.5    9.0	Her X-1                       
299.6042  35.2084    0.5  48.6 -161.3  23.0789  25.5    0.8	Cyg X-1                       
308.2500  40.9507    3.7  47.7 -173.2   2.2665   3.1    6.3	Cyg X-3                       
232.9741  63.5127    1.4   0.0   40.1   2.9367   8.1 ------	UNKNOWN                       
242.7743  35.9721    3.6  28.2  -90.7   1.6724   3.2 ------	UNKNOWN                       
217.2326  17.7115    4.5  47.1  -53.1   5.1601   2.6 ------	UNKNOWN                       
250.1649  23.9497    4.1  41.2  -98.0   6.1634   2.8 ------	UNKNOWN                       
269.1098  24.5029    2.8  45.6 -122.4   7.2310   4.1 ------	UNKNOWN