GRB111204A: 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: Mon Jan 13 17:38:25 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger509018
======================================================================

  Trigger: 00509018      Segment: 000

  BAT Trigger Time: 344698656   [s; MET]
      Trigger Stop: 344698720   [s; MET]
               UTC: 2011-12-04T13:37:28.359180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 336.641463053206   Dec: -31.3949607281387  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.23
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.23

  Analysis Position:   [ source = BAT ]
    RA: 336.641463053206   Dec: -31.3949607281387  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 336.657247448748   Dec: -31.4147393647623  [deg; J2000]  
        { 22h 26m 37.7s , -31d 24' 53.1" }
         +/- 2.23697508496837 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.29940148842213 [arcmin] (formal 1-sigma fit error)
    SNR: 9.62947157811885
 
  Angular difference between the analysis and refined position is 1.435859 arcmin
 
  Partial Coding Fraction: 0.75    [ including projection effects ]

  Duration
     T90: 48 +/- 22.6274169979695
        Measured from: 33
                   to: 81     [s; relative to TRIGTIME]
     T50: 32 +/- 16
        Measured from: 33
                   to: 65     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 56.5     
                   to: 57.5     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 33     
                   to: 81     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.270454   0.307515   0.184588   0.030591
           0.042423   0.044362   0.039715   0.035968 [error]
 Peak      0.011526   0.015307   0.004056  -0.001770
           0.006172   0.006630   0.005750   0.005416 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   48.000   33.000   81.000
T90    48.000   33.000   81.000
T50    32.000   33.000   65.000
Peak    1.000   56.500   57.500
 
 
====== 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      -1.828    -0.306      0.285       -           -               -         1.06e-03     -2.05e-04          1.97e-04      53.960   57
CPL     -1.826    -1.247      1.093     9992.780    -9992.770      -9992.780      1.07e-03     -1.07e-03          2.76e-03      53.960   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -2.141     -1.585     1.090       -           -               -         1.66e-03     -1.33e-03          1.36e-03      62.190   57
CPL      1.496      N/A       N/A          29.743      N/A           N/A         5.13e-01        N/A               N/A         61.460   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   8.87e-08  1.34e-07  1.51e-07  3.22e-07  4.70e-07  6.95e-07   erg/cm2
      90%_error_low -1.98e-08 -2.07e-08 -3.89e-08 -1.41e-07 -8.90e-08 -1.87e-07   erg/cm2
      90%_error_hi   2.05e-08  2.07e-08  3.95e-08  2.00e-07  9.16e-08  2.34e-07   erg/cm2
Peak flux       PL   1.27e-01  8.79e-02  3.99e-02  2.52e-02  2.67e-01  2.80e-01   ph/cm2/s
      90%_error_low -8.82e-02 -8.79e-02 -3.99e-02 -2.52e-02 -1.56e-01 -1.64e-01   ph/cm2/s
      90%_error_hi   9.50e-02  5.34e-02  4.67e-02  9.35e-02  1.57e-01  1.72e-01   ph/cm2/s
 
Fluence        CPL   8.87e-08  1.34e-07  1.51e-07  3.21e-07  4.70e-07  6.83e-07   erg/cm2
      90%_error_low -2.02e-08 -2.07e-08 -3.87e-08 -2.04e-07 -1.04e-07 -2.89e-07   erg/cm2
      90%_error_hi   2.10e-08  2.70e-08  3.98e-08  1.14e-07  7.39e-08  1.34e-07   erg/cm2
Peak flux      CPL   1.20e-01  1.21e-01  6.58e-03  1.84e-06  2.47e-01  2.48e-01   ph/cm2/s
      90%_error_low -9.42e-02     N/A   -6.58e-03 -1.84e-06 -1.42e-01     N/A     ph/cm2/s
      90%_error_hi   1.07e-01     N/A    7.27e-02  5.47e-02  1.51e-01     N/A     ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  336.6572   -31.4147   0.0200    31.5292  -155.2796         0.7557589      9.629 TRIG_00509018                 
 
Foreground time interval of the image:
 33.000  72.501 (delta_t =  39.501 [sec])
Background time interval of the image:
-722.499 -701.003 (delta_t =  21.496 [sec])
-239.000  33.000 (delta_t = 272.000 [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   33.000 sec. to   81.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.82751     ( -0.305839   0.285393 )
Norm@50keV  : 1.06355E-03    ( -0.000204942   0.000197227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.96 using 59 PHA bins.
# Reduced chi-squared =         0.9467 for     57 degrees of freedom 
# Null hypothesis probability =   5.898182e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.148155 ( -0.022922  0.022926 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.69668e-07 ( -8.89522e-08  9.16008e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   33.000 sec. to   81.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.82591     ( -1.24674   1.09316 )
Epeak [keV] : 9992.78      ( -9975.72 -9975.73 )
Norm@50keV  : 1.06583E-03    ( -0.001065   0.00276542 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.96 using 59 PHA bins.
# Reduced chi-squared =         0.9636 for     56 degrees of freedom 
# Null hypothesis probability =   5.524320e-01
 
Photon flux (15-150 keV)    in 48 sec: 0.148149 ( -0.023448  0.022924 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.69765e-07 ( -1.04094e-07  7.39368e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   56.500 sec. to   57.500 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.14121     ( -1.58497   1.08992 )
Norm@50keV  : 1.66450E-03    ( -0.00133483   0.0013615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.19 using 59 PHA bins.
# Reduced chi-squared =          1.091 for     57 degrees of freedom 
# Null hypothesis probability =   2.967596e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.267349 ( -0.156388  0.157118 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.55367e-08 ( -1.04036e-08  1.26737e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   56.500 sec. to   57.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.36818     (       )
Epeak [keV] : 28.9126      (   )
Norm@50keV  : 56.2115    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.35 using 59 PHA bins.
# Reduced chi-squared =          1.095 for     56 degrees of freedom 
# Null hypothesis probability =   2.903355e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.247475 ( -0.142452  0.151284 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 48.0 sec.
Hardness ratio (energy fluence ratio) = 1.12704100461

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

S(15-50 keV)  = 2.2231838e-07
S(50-150 keV) = 2.4734971e-07

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 = -5.572793627266761E-01, IMY = 2.565603686262565E-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:
-722.499400 -701.003300
-239.000000 33.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5771  35.1769    4.3  52.4  -25.6   1.7641   2.7    1.6	Cyg X-1                       
308.1454  40.9551    5.8  50.8  -14.4   1.0562   2.0    1.6	Cyg X-3                       
326.1021  38.3065    7.4  40.9   -0.5   0.5707   1.6    3.4	Cyg X-2                       
358.5508  42.0965    3.2  45.1   35.9   2.5837   3.6 ------	UNKNOWN                       
355.9366  11.2300    2.6  18.7   69.4   1.1020   4.4 ------	UNKNOWN                       
 10.1555 -34.2094    2.5  43.6  161.9   2.3323   4.7 ------	UNKNOWN                       
354.6332 -18.7957    3.0  22.9  162.7   0.9389   3.9 ------	UNKNOWN                       
  6.9025 -49.4761    2.9  54.1  177.0   3.4582   4.0 ------	UNKNOWN                       
347.2227 -59.0441    2.6  59.1 -166.2   6.8478   4.5 ------	UNKNOWN                       
318.0187 -29.1635    3.0  36.4 -127.3   1.5235   3.9 ------	UNKNOWN                       

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

Time interval of the image:
33.000000 72.500600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5017  35.1307    5.0  52.4  -25.7  -0.4622  -2.3    6.1	Cyg X-1                       
307.9447  41.0443    6.1  51.0  -14.5  -0.2932  -1.9    9.3	Cyg X-3                       
326.2726  38.4268    6.4  40.9   -0.2   0.1830   1.8    7.9	Cyg X-2                       
  1.9208  15.5601    2.9  25.9   69.2   0.3787   4.0 ------	UNKNOWN                       
336.6572 -31.4147    1.2  31.5 -155.3   0.7562   9.6 ------	UNKNOWN                       
316.8637 -45.7633    2.3  50.3 -140.7   1.2468   5.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
123.700600 337.300600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
333.8521   2.2274    2.9  33.7   12.6   0.9268   3.9 ------	UNKNOWN                       
336.1291 -57.6643    2.7  26.3 -161.7   0.7872   4.3 ------	UNKNOWN                       
 46.4145 -87.2515    2.8  57.7 -165.4   3.9588   4.1 ------	UNKNOWN                       
282.8854 -51.7269    3.4  43.8 -116.2   2.7628   3.4 ------	UNKNOWN