GRB111008A: 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 May 10 04:03:36 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger505054
======================================================================

  Trigger: 00505054      Segment: 000

  BAT Trigger Time: 339804785.728   [s; MET]
      Trigger Stop: 339804786.752   [s; MET]
               UTC: 2011-10-08T22:12:58.280940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 60.4541236181108   Dec: -32.688648181568  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.07
     Image Trigger?:     NO
     Rate S/N Ratio:     36.2353418639869  [ if not an image trigger ]
     Image S/N Ratio:    9.07

  Analysis Position:   [ source = BAT ]
    RA: 60.4541236181108   Dec: -32.688648181568  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 60.4377176140269   Dec: -32.7078217540351  [deg; J2000]  
        { 04h 01m 45.1s , -32d 42' 28.2" }
         +/- 1.22095179365501 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.49597121468673 [arcmin] (formal 1-sigma fit error)
    SNR: 22.8698520673373
 
  Angular difference between the analysis and refined position is 1.417619 arcmin
 
  Partial Coding Fraction: 0.09667969    [ including projection effects ]

  Duration
     T90: 62.8479999303818 +/- 2.25947693275652
        Measured from: -1.03999996185303
                   to: 61.8079999685287     [s; relative to TRIGTIME]
     T50: 29.9999999403954 +/- 1.64326014857
        Measured from: 1.24800002574921
                   to: 31.2479999661446     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0440000295639038     
                   to: 1.0440000295639     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.63599997758865     
                   to: 68.7879999876022     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.516150   3.300537   2.064602   0.628883
           0.114890   0.122282   0.110068   0.093016 [error]
 Peak      0.149063   0.294499   0.253708   0.111343
           0.024466   0.028085   0.027881   0.022013 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   71.424   -2.636   68.788
T90    62.848   -1.040   61.808
T50    30.000    1.248   31.248
Peak    1.000    0.044    1.044
 
 
====== 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      -1.816    -0.087      0.086       -           -               -         7.91e-03     -3.89e-04          3.87e-04      49.770   57
CPL     -1.698    -0.331      0.341      122.566     -59.413      -122.566      9.12e-03     -1.33e-03          4.45e-03      49.370   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      -1.259     -0.183     0.185       -           -               -         5.42e-02     -5.94e-03          5.94e-03      68.240   57
CPL     -1.011     -0.346     0.730      212.705    -212.705      -212.705      7.16e-02     -2.66e-02          8.70e-02      67.810   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   9.72e-07  1.47e-06  1.67e-06  3.62e-06  5.20e-06  7.74e-06   erg/cm2
      90%_error_low -7.44e-08 -6.88e-08 -1.12e-07 -4.88e-07 -2.59e-07 -5.86e-07   erg/cm2
      90%_error_hi   7.63e-08  6.87e-08  1.12e-07  5.37e-07  2.60e-07  6.22e-07   erg/cm2
Peak flux       PL   1.77e+00  2.06e+00  1.72e+00  2.42e+00  6.42e+00  7.97e+00   ph/cm2/s
      90%_error_low -3.54e-01 -2.65e-01 -2.17e-01 -5.79e-01 -7.30e-01 -9.00e-01   ph/cm2/s
      90%_error_hi   3.75e-01  2.61e-01  2.15e-01  6.80e-01  7.32e-01  9.08e-01   ph/cm2/s
 
Fluence        CPL   9.53e-07  1.49e-06  1.68e-06  2.98e-06  5.15e-06  7.11e-06   erg/cm2
      90%_error_low -8.84e-08 -8.09e-08 -1.15e-07 -1.18e-06 -2.95e-07 -1.22e-06   erg/cm2
      90%_error_hi   8.08e-08  8.39e-08  1.16e-07  7.70e-07  2.93e-07  8.66e-07   erg/cm2
Peak flux      CPL   1.69e+00  2.11e+00  1.77e+00  1.84e+00  6.38e+00  7.41e+00   ph/cm2/s
      90%_error_low -4.11e-01 -2.90e-01 -2.48e-01 -9.39e-01 -7.39e-01 -1.22e+00   ph/cm2/s
      90%_error_hi   4.14e-01  3.02e-01  2.58e-01  8.14e-01  7.41e-01  1.11e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   60.4377   -32.7078   0.0085    45.6811   139.4474         5.0664471     22.870 TRIG_00505054                 
 
Foreground time interval of the image:
 -2.636  12.173 (delta_t =  14.809 [sec])
Background time interval of the image:
-239.728  -2.636 (delta_t = 237.092 [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   -2.636 sec. to   68.788 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.81649     ( -0.0867478   0.0855838 )
Norm@50keV  : 7.90984E-03    ( -0.000389179   0.000386842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.77 using 59 PHA bins.
# Reduced chi-squared =         0.8731 for     57 degrees of freedom 
# Null hypothesis probability =   7.405679e-01
 
Photon flux (15-150 keV)    in 71.42 sec: 1.09706 ( -0.0526  0.05273 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.19876e-06 ( -2.59297e-07  2.60449e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -2.636 sec. to   68.788 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.69752     ( -0.330552   0.34093 )
Epeak [keV] : 122.566      ( -59.4222 -122.576 )
Norm@50keV  : 9.11593E-03    ( -0.00132572   0.00445052 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.37 using 59 PHA bins.
# Reduced chi-squared =         0.8817 for     56 degrees of freedom 
# Null hypothesis probability =   7.220666e-01
 
Photon flux (15-150 keV)    in 71.42 sec: 1.08943 ( -0.05629  0.05638 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.14683e-06 ( -2.95402e-07  2.92929e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.044 sec. to    1.044 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25893     ( -0.182546   0.184942 )
Norm@50keV  : 5.42177E-02    ( -0.00594418   0.00594416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.24 using 59 PHA bins.
# Reduced chi-squared =          1.197 for     57 degrees of freedom 
# Null hypothesis probability =   1.464039e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.42195 ( -0.73037  0.73195 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.41402e-07 ( -6.44112e-08  6.47339e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.044 sec. to    1.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01143     ( -0.346205   0.730426 )
Epeak [keV] : 212.705      ( -212.744 -212.744 )
Norm@50keV  : 7.15617E-02    ( -0.0265608   0.086965 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.81 using 59 PHA bins.
# Reduced chi-squared =          1.211 for     56 degrees of freedom 
# Null hypothesis probability =   1.338924e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.37631 ( -0.73929  0.74091 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.34601e-07 ( -6.85752e-08  6.73207e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 62.848 sec.
Hardness ratio (energy fluence ratio) = 1.13566491493

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

S(15-50 keV)  = 2.4444927e-06
S(50-150 keV) = 2.754312e-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 = -7.780904702911140E-01, IMY = -6.657892182733026E-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:
-239.728000 -2.636000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 31.8570 -39.6562    2.8  33.3  106.5   1.5645   4.2 ------	UNKNOWN                       
 47.4952 -61.1413    2.6  16.3  148.5   0.7845   4.5 ------	UNKNOWN                       
303.9087 -37.2138    3.4  49.3   -2.7   1.3780   3.4 ------	UNKNOWN                       
294.7679 -53.9718    3.1  37.1  -22.1   0.8511   3.7 ------	UNKNOWN                       
114.4976 -35.5144    3.2  59.1 -166.1   4.4739   3.6 ------	UNKNOWN                       
192.4066 -77.7178    2.5  30.3  -97.9   1.2993   4.7 ------	UNKNOWN                       

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

Time interval of the image:
-2.636000 12.172600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 60.4377 -32.7078    0.5  45.7  139.4   5.0665  22.9 ------	UNKNOWN                       
 13.9409 -42.0485    2.4  29.9   81.0   0.4162   4.9 ------	UNKNOWN                       
284.5861 -34.9864    1.9  57.3  -19.7   1.0849   5.9 ------	UNKNOWN                       
281.4736 -33.8542    1.9  59.3  -22.0   1.4178   5.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
80.172600 962.308800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 65.3180  18.9413    2.8  51.9  153.5  10.2703   4.1 ------	UNKNOWN                       
 99.9367  12.8206    3.0  59.1 -166.0  13.1385   3.9 ------	UNKNOWN                       
 66.0306 -75.5682    2.7  42.9  -34.3   3.6012   4.3 ------	UNKNOWN                       
110.9752 -58.7295    3.8  42.3  -68.8   7.0719   3.0 ------	UNKNOWN