GRB101023A: 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: Fri Jan 17 15:23:53 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger436981
======================================================================

  Trigger: 00436981      Segment: 000

  BAT Trigger Time: 309567018.688   [s; MET]
      Trigger Stop: 309567019.712   [s; MET]
               UTC: 2010-10-23T22:50:12.387740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 317.954259194012   Dec: -65.3938290160607  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.54
     Image Trigger?:     NO
     Rate S/N Ratio:     16.6733320005331  [ if not an image trigger ]
     Image S/N Ratio:    8.54

  Analysis Position:   [ source = BAT ]
    RA: 317.954259194012   Dec: -65.3938290160607  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 317.948074720175   Dec: -65.38923186277  [deg; J2000]  
        { 21h 11m 47.5s , -65d 23' 21.2" }
         +/- 1.35793896844732 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.55432133248174 [arcmin] (formal 1-sigma fit error)
    SNR: 19.6466925747303
 
  Angular difference between the analysis and refined position is 0.316161 arcmin
 
  Partial Coding Fraction: 0.1103516    [ including projection effects ]

  Duration
     T90: 80.823999941349 +/- 2.11283695364665
        Measured from: 0.807999968528748
                   to: 81.6319999098778     [s; relative to TRIGTIME]
     T50: 15.0999999046326 +/- 1.07807980541383
        Measured from: 49.555999994278
                   to: 64.6559998989105     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 57.3439999818802     
                   to: 58.3439999818802     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -12.3080000281334     
                   to: 137.267999947071     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    11.906794  16.150923  12.151793   2.786098
           0.144773   0.160471   0.155380   0.164616 [error]
 Peak      0.557706   0.970924   0.938500   0.278843
           0.011891   0.015079   0.015630   0.011579 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  149.576  -12.308  137.268
T90    80.824    0.808   81.632
T50    15.100   49.556   64.656
Peak    1.000   57.344   58.344
 
 
====== 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: 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      -1.537    -0.034      0.034       -           -               -         1.87e-02     -3.16e-04          3.16e-04      47.290   57
CPL     -1.295    -0.142      0.147      163.069     -40.657       143.061      2.40e-02     -3.16e-03          3.76e-03      38.730   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      -1.130     -0.038     0.038       -           -               -         1.82e-01     -3.73e-03          3.73e-03      62.310   57
CPL     -0.879     -0.153     0.159      264.006     -78.753       298.354      2.33e-01     -3.19e-02          3.83e-02      54.370   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   3.71e-06  6.66e-06  9.17e-06  2.63e-05  2.64e-05  4.58e-05   erg/cm2
      90%_error_low -1.35e-07 -1.38e-07 -1.87e-07 -1.26e-06 -4.58e-07 -1.34e-06   erg/cm2
      90%_error_hi   1.38e-07  1.38e-07  1.87e-07  1.31e-06  4.59e-07  1.37e-06   erg/cm2
Peak flux       PL   5.25e+00  6.58e+00  6.01e+00  9.58e+00  2.11e+01  2.74e+01   ph/cm2/s
      90%_error_low -2.30e-01 -1.73e-01 -1.35e-01 -4.71e-01 -4.57e-01 -5.83e-01   ph/cm2/s
      90%_error_hi   2.34e-01  1.73e-01  1.34e-01  4.87e-01  4.57e-01  5.86e-01   ph/cm2/s
 
Fluence        CPL   3.47e-06  6.71e-06  9.34e-06  1.93e-05  2.59e-05  3.88e-05   erg/cm2
      90%_error_low -1.86e-07 -1.44e-07 -2.11e-07 -3.04e-06 -5.39e-07 -3.09e-06   erg/cm2
      90%_error_hi   1.89e-07  1.44e-07  2.12e-07  3.75e-06  5.37e-07  3.78e-06   erg/cm2
Peak flux      CPL   4.87e+00  6.63e+00  6.19e+00  7.56e+00  2.08e+01  2.53e+01   ph/cm2/s
      90%_error_low -3.10e-01 -1.79e-01 -1.70e-01 -9.93e-01 -4.90e-01 -1.15e+00   ph/cm2/s
      90%_error_hi   3.16e-01  1.79e-01  1.71e-01  1.18e+00  4.91e-01  1.31e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  317.9481   -65.3892   0.0096    41.1648  -113.0263         6.0373332     19.647 TRIG_00436981                 
 
Foreground time interval of the image:
-12.308  13.013 (delta_t =  25.321 [sec])
Background time interval of the image:
-179.787 -12.308 (delta_t = 167.479 [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  -12.308 sec. to  137.268 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53739     ( -0.0339927   0.0340034 )
Norm@50keV  : 1.87345E-02    ( -0.000315896   0.000315879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.29 using 59 PHA bins.
# Reduced chi-squared =         0.8297 for     57 degrees of freedom 
# Null hypothesis probability =   8.168520e-01
 
Photon flux (15-150 keV)    in 149.6 sec: 2.36317 ( -0.04685  0.04703 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.64364e-05 ( -4.58063e-07  4.58588e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -12.308 sec. to  137.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2953     ( -0.142079   0.146605 )
Epeak [keV] : 163.069      ( -40.657 143.061 )
Norm@50keV  : 2.39739E-02    ( -0.00315892   0.00376402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.73 using 59 PHA bins.
# Reduced chi-squared =         0.6916 for     56 degrees of freedom 
# Null hypothesis probability =   9.619380e-01
 
Photon flux (15-150 keV)    in 149.6 sec: 2.30953 ( -0.05523  0.0556 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.59484e-05 ( -5.38599e-07  5.3729e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   57.344 sec. to   58.344 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13044     ( -0.0376752   0.037753 )
Norm@50keV  : 0.181506    ( -0.00373229   0.00373014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.31 using 59 PHA bins.
# Reduced chi-squared =          1.093 for     57 degrees of freedom 
# Null hypothesis probability =   2.931317e-01
 
Photon flux (15-150 keV)    in 1 sec: 21.1200 ( -0.4566  0.4573 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.87988e-06 ( -4.1099e-08  4.11317e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   57.344 sec. to   58.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.879393     ( -0.153318   0.158695 )
Epeak [keV] : 264.006      ( -78.7534 298.354 )
Norm@50keV  : 0.232504    ( -0.0319048   0.0382511 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.37 using 59 PHA bins.
# Reduced chi-squared =         0.9709 for     56 degrees of freedom 
# Null hypothesis probability =   5.367888e-01
 
Photon flux (15-150 keV)    in 1 sec: 20.8096 ( -0.4898  0.4909 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.8578e-06 ( -4.36216e-08  4.35409e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 80.824 sec.
Hardness ratio (energy fluence ratio) = 1.39056062663

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

S(15-50 keV)  = 1.0184261e-05
S(50-150 keV) = 1.5764168e-05

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 = -3.420041356545789E-01, IMY = 8.046851815051855E-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:
-179.787400 -12.308000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
342.1958   2.5998    2.2  38.8   14.0   1.5511   5.3 ------	UNKNOWN                       
 69.0727 -52.1747    2.8  52.7  175.9   2.7444   4.1 ------	UNKNOWN                       
358.6283 -58.8375    2.7  26.2 -136.9   0.9756   4.3 ------	UNKNOWN                       
 87.3973 -68.6526    3.2  59.1 -162.9   5.0676   3.6 ------	UNKNOWN                       
312.4914 -62.4418    3.0  41.9 -107.4   4.4073   3.8 ------	UNKNOWN                       

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

Time interval of the image:
-12.308000 13.012600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 72.8992 -48.3885    2.4  55.8  171.9   1.9412   4.7 ------	UNKNOWN                       
313.4901   0.3490    3.1  54.4  -19.9   0.9574   3.8 ------	UNKNOWN                       
314.3108  -4.2725    2.4  50.7  -23.7   1.0180   4.8 ------	UNKNOWN                       
317.9483 -65.3892    0.6  41.2 -113.0   6.0381  19.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
73.812600 194.012590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.8155 -62.7898    6.4  46.9 -129.1   1.3786   1.8    4.5	GX 301-2                      
256.0218 -37.7280   11.2  44.7  -60.4   0.7911   1.0    7.2	4U 1700-377                   
264.6546 -44.5252    4.8  35.4  -57.8  -0.6526  -2.4    5.9	4U 1735-44                    
270.1458 -25.0627    8.2  50.3  -37.9   1.0285   1.4    7.6	GX 5-1                        
270.3760 -25.8793    0.0  49.5  -38.1   0.1896   0.3    9.1	GRS 1758-258                  
275.9096 -30.3871    5.1  43.4  -34.5  -0.6727  -2.3    1.4	H1820-303                     
285.1491 -24.9823    9.8  45.5  -20.8   0.3499   1.2    7.2	HT1900.1-2455                 
263.0939 -33.9498   23.0  45.1  -50.7   0.3342   0.5    8.7	GX 354-0                      
303.9516 -19.3267    3.6  47.0    4.6   1.0350   3.2 ------	UNKNOWN                       
317.9326 -65.3867    0.4   0.0  -81.7   4.5841  27.3 ------	UNKNOWN                       
275.8700 -38.7881    2.9  35.9  -40.4   0.9317   4.0 ------	UNKNOWN                       
248.5502 -68.5458    2.2  25.9 -105.6   1.0455   5.2 ------	UNKNOWN                       
274.7889 -35.8937    3.2  38.8  -39.4   0.9033   3.6 ------	UNKNOWN