GRB041223: 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: Wed Jan 22 23:29:02 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger100585
======================================================================

  Trigger: 00100585      Segment: 000

  BAT Trigger Time: 125503577.28   [s; MET]
      Trigger Stop: 125503578.304   [s; MET]
               UTC: 2004-12-23T14:06:17.956380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 100.120286808231   Dec: -37.0297252139607  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17
     Image Trigger?:     NO
     Rate S/N Ratio:     86.6083136886985  [ if not an image trigger ]
     Image S/N Ratio:    17

  Analysis Position:   [ source = BAT ]
    RA: 100.120286808231   Dec: -37.0297252139607  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 100.185640054566   Dec: -37.072204340127  [deg; J2000]  
        { 06h 40m 44.6s , -37d 04' 19.9" }
         +/- 0.493443667020262 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.0984947176852317 [arcmin] (formal 1-sigma fit error)
    SNR: 83.4354109356942
 
  Angular difference between the analysis and refined position is 4.036077 arcmin
 
  Partial Coding Fraction: 0.4765625    [ including projection effects ]

  Duration
     T90: 109.060000002384 +/- 1.80393348808729
        Measured from: 1.76399999856949
                   to: 110.824000000954     [s; relative to TRIGTIME]
     T50: 29.1960000097752 +/- 0.611476899528696
        Measured from: 19.1599999964237
                   to: 48.3560000061989     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 35.0119999945164     
                   to: 36.0119999945164     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.5359999984503     
                   to: 145.944000005722     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.922442   8.232876   8.249675   2.526461
           0.090361   0.096641   0.089010   0.071964 [error]
 Peak      0.164359   0.310417   0.383767   0.130573
           0.009761   0.012276   0.013500   0.010068 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  156.480  -10.536  145.944
T90   109.060    1.764  110.824
T50    29.196   19.160   48.356
Peak    1.000   35.012   36.012
 
 
====== 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      -1.152    -0.030      0.030       -           -               -         1.06e-02     -1.78e-04          1.78e-04      33.280   57
CPL     -1.016    -0.063      0.127      455.208    -185.950      2687.442      1.20e-02     -1.24e-03          1.43e-03      29.710   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      -0.901     -0.070     0.071       -           -               -         6.62e-02     -2.70e-03          2.69e-03      44.420   57
CPL     -0.669     -0.211     0.281      339.626      N/A           N/A         8.36e-02        N/A               N/A         42.190   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   1.52e-06  3.47e-06  6.24e-06  2.66e-05  1.70e-05  3.78e-05   erg/cm2
      90%_error_low -5.71e-08 -7.69e-08 -1.04e-07 -1.06e-06 -2.72e-07 -1.08e-06   erg/cm2
      90%_error_hi   5.81e-08  7.69e-08  1.04e-07  1.09e-06  2.72e-07  1.11e-06   erg/cm2
Peak flux       PL   1.54e+00  2.22e+00  2.38e+00  4.73e+00  7.60e+00  1.09e+01   ph/cm2/s
      90%_error_low -1.27e-01 -1.13e-01 -1.03e-01 -4.35e-01 -3.10e-01 -5.04e-01   ph/cm2/s
      90%_error_hi   1.31e-01  1.12e-01  1.03e-01  4.62e-01  3.10e-01  5.13e-01   ph/cm2/s
 
Fluence        CPL   1.46e-06  3.47e-06  6.34e-06  2.28e-05  1.69e-05  3.41e-05   erg/cm2
      90%_error_low -8.07e-08 -7.81e-08 -1.35e-07 -2.88e-06 -2.83e-07 -2.86e-06   erg/cm2
      90%_error_hi   8.17e-08  7.81e-08  1.35e-07  3.38e-06  2.82e-07  3.35e-06   erg/cm2
Peak flux      CPL   1.45e+00  2.24e+00  2.45e+00  3.75e+00  7.55e+00  9.89e+00   ph/cm2/s
      90%_error_low -1.63e-01 -1.19e-01 -1.31e-01 -8.53e-01 -3.16e-01 -9.05e-01   ph/cm2/s
      90%_error_hi   1.67e-01  1.20e-01  1.33e-01  1.02e+00  3.16e-01  1.17e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  100.1856   -37.0722   0.0023    26.6649    79.5061        27.9825398     83.435 TRIG_00100585                 
 
Foreground time interval of the image:
-10.536 145.944 (delta_t = 156.480 [sec])
Background time interval of the image:
-299.280 -10.536 (delta_t = 288.744 [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  -10.536 sec. to  145.944 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.15246     ( -0.0303074   0.0304377 )
Norm@50keV  : 1.05568E-02    ( -0.000178385   0.000178021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          33.28 using 59 PHA bins.
# Reduced chi-squared =         0.5838 for     57 degrees of freedom 
# Null hypothesis probability =   9.949427e-01
 
Photon flux (15-150 keV)    in 156.5 sec: 1.23150 ( -0.02277  0.02283 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.69972e-05 ( -2.72221e-07  2.72133e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -10.536 sec. to  145.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01559     ( -0.0627826   0.126635 )
Epeak [keV] : 455.208      ( -185.951 2687.44 )
Norm@50keV  : 1.19605E-02    ( -0.00124422   0.00142593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          29.71 using 59 PHA bins.
# Reduced chi-squared =         0.5305 for     56 degrees of freedom 
# Null hypothesis probability =   9.985044e-01
 
Photon flux (15-150 keV)    in 156.5 sec: 1.21889 ( -0.02513  0.02527 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.69147e-05 ( -2.82681e-07  2.81993e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   35.012 sec. to   36.012 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.901184     ( -0.0699371   0.0705351 )
Norm@50keV  : 6.62464E-02    ( -0.00269562   0.00268935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.42 using 59 PHA bins.
# Reduced chi-squared =         0.7793 for     57 degrees of freedom 
# Null hypothesis probability =   8.876615e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.60362 ( -0.30974  0.30987 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.43207e-07 ( -3.30735e-08  3.31474e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   35.012 sec. to   36.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.669459     ( -0.210697   0.281208 )
Epeak [keV] : 339.626      (   )
Norm@50keV  : 8.36055E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.19 using 59 PHA bins.
# Reduced chi-squared =         0.7533 for     56 degrees of freedom 
# Null hypothesis probability =   9.141764e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.54684 ( -0.31623  0.31626 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.37157e-07 ( -3.42304e-08  3.41193e-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 = 9.146238536026967E-02, IMY = -4.937803729858381E-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:
-299.280000 -10.536000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5156 -40.5550    0.8  22.5  148.7   2.8536  14.4    0.6	Vela X-1                      
170.3444 -60.6017    2.8  24.3 -132.4   0.8385   4.2    1.5	Cen X-3                       
186.6427 -62.7649    0.4  30.4 -121.0   7.1526  30.6    0.5	GX 301-2                      
123.6603 -36.7281    2.1  24.2  123.7   1.1511   5.5 ------	UNKNOWN                       
172.6478 -17.7866    3.3  57.0 -179.1   3.6186   3.6 ------	UNKNOWN                       
127.9382 -78.0187    2.6  17.4  -70.3   0.7825   4.3 ------	UNKNOWN                       
183.5161 -54.5673    2.4  33.4 -135.8   1.0397   4.7 ------	UNKNOWN                       
183.5640 -53.3616    2.1  34.1 -137.5   1.3039   5.5 ------	UNKNOWN                       

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

Time interval of the image:
-10.536000 145.944000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.2830 -40.5611    5.1  22.4  148.3   0.5455   2.3   11.2	Vela X-1                      
170.0185 -60.6069    6.2  24.1 -132.5   0.4552   1.8    8.8	Cen X-3                       
186.6291 -62.8720  680.4  30.3 -120.8   0.0045   0.0    6.2	GX 301-2                      
100.1856 -37.0722    0.1  26.7   79.5  27.9830  83.6 ------	UNKNOWN                       
226.0157 -67.6348    3.1  41.0  -98.3   3.1733   3.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
-299.280000 302.787400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4999 -40.5631    0.7  22.5  148.7   6.3132  17.3    1.4	Vela X-1                      
170.2536 -60.6085    2.6  24.2 -132.4   1.8559   4.5    2.0	Cen X-3                       
186.6385 -62.7671    0.3  30.4 -121.0  16.3830  34.9    0.5	GX 301-2                      
100.1870 -37.0735    0.2  26.7   79.5  28.9173  61.2 ------	UNKNOWN                       
 56.8480 -50.9427    2.8  35.0   12.8   2.0170   4.2 ------	UNKNOWN                       
 33.8573 -51.4803    2.9  45.1   -3.2   2.8371   4.0 ------	UNKNOWN                       
183.4550 -54.6179    3.7  33.3 -135.8   1.4708   3.1 ------	UNKNOWN