GRB120811C

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 01:42:57 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger530689
======================================================================

  Trigger: 00530689      Segment: 000

  BAT Trigger Time: 366392101.696   [s; MET]
      Trigger Stop: 366392102.72   [s; MET]
               UTC: 2012-08-11T15:34:52.170040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 199.709572292913   Dec: 62.2913515948821  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.6
     Image Trigger?:     NO
     Rate S/N Ratio:     22.8910462845192  [ if not an image trigger ]
     Image S/N Ratio:    12.6

  Analysis Position:   [ source = BAT ]
    RA: 199.709572292913   Dec: 62.2913515948821  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 199.691572640752   Dec: 62.2970895444334  [deg; J2000]  
        { 13h 18m 46.0s , +62d 17' 49.5" }
         +/- 0.55783317115792 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.162278695238235 [arcmin] (formal 1-sigma fit error)
    SNR: 70.0253105067732
 
  Angular difference between the analysis and refined position is 0.608808 arcmin
 
  Partial Coding Fraction: 0.890625    [ including projection effects ]

  Duration
     T90: 24.3439999222755 +/- 3.05592145665642
        Measured from: -4.01199996471405
                   to: 20.3319999575615     [s; relative to TRIGTIME]
     T50: 7.07199990749359 +/- 0.495628927585199
        Measured from: 2.52400004863739
                   to: 9.59599995613098     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.26800000667572     
                   to: 6.26800000667572     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -9.67599999904633     
                   to: 31.3880000114441     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.028852   2.230797   1.140891   0.153598
           0.037779   0.040201   0.036573   0.036458 [error]
 Peak      0.159384   0.194819   0.119972   0.017493
           0.007435   0.008088   0.007071   0.005946 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   41.064   -9.676   31.388
T90    24.344   -4.012   20.332
T50     7.072    2.524    9.596
Peak    1.000    5.268    6.268
 
 
====== 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      -1.991    -0.057      0.056       -           -               -         8.05e-03     -2.39e-04          2.38e-04      65.950   57
CPL     -1.331    -0.261      0.278       47.312      -4.709         5.248      1.76e-02     -4.60e-03          6.79e-03      45.520   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      -1.777     -0.093     0.092       -           -               -         3.02e-02     -1.69e-03          1.68e-03      62.100   57
CPL     -1.020     -0.397     0.437       60.075      -8.369        18.088      7.61e-02     -2.88e-02          5.28e-02      50.670   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   6.71e-07  9.15e-07  9.20e-07  1.68e-06  3.05e-06  4.18e-06   erg/cm2
      90%_error_low -3.27e-08 -2.55e-08 -3.84e-08 -1.48e-07 -8.71e-08 -1.77e-07   erg/cm2
      90%_error_hi   3.33e-08  2.55e-08  3.85e-08  1.57e-07  8.73e-08  1.84e-07   erg/cm2
Peak flux       PL   1.62e+00  1.39e+00  8.09e-01  7.06e-01  4.12e+00  4.52e+00   ph/cm2/s
      90%_error_low -1.32e-01 -7.14e-02 -5.92e-02 -9.81e-02 -2.12e-01 -2.28e-01   ph/cm2/s
      90%_error_hi   1.35e-01  7.13e-02  5.92e-02  1.08e-01  2.12e-01  2.28e-01   ph/cm2/s
 
Fluence        CPL   5.96e-07  9.57e-07  9.15e-07  6.68e-07  2.84e-06  3.14e-06   erg/cm2
      90%_error_low -4.18e-08 -3.04e-08 -4.22e-08 -1.80e-07 -1.13e-07 -2.19e-07   erg/cm2
      90%_error_hi   4.26e-08  3.06e-08  4.19e-08  2.59e-07  1.14e-07  2.88e-07   erg/cm2
Peak flux      CPL   1.44e+00  1.49e+00  8.30e-01  3.06e-01  3.96e+00  4.06e+00   ph/cm2/s
      90%_error_low -1.58e-01 -8.82e-02 -6.59e-02 -1.05e-01 -2.26e-01 -2.57e-01   ph/cm2/s
      90%_error_hi   1.61e-01  8.97e-02  6.61e-02  1.59e-01  2.26e-01  2.75e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  199.6916    62.2971   0.0027    21.2378   159.5756         4.7735500     70.025 TRIG_00530689                 
 
Foreground time interval of the image:
 -9.676  12.205 (delta_t =  21.881 [sec])
Background time interval of the image:
-427.295 -408.540 (delta_t =  18.755 [sec])
-239.696  -9.676 (delta_t = 230.020 [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

Bokeh Plot

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   -9.676 sec. to   31.388 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.99143     ( -0.0566533   0.0561722 )
Norm@50keV  : 8.04955E-03    ( -0.000239251   0.000238326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.95 using 59 PHA bins.
# Reduced chi-squared =          1.157 for     57 degrees of freedom 
# Null hypothesis probability =   1.950401e-01
 
Photon flux (15-150 keV)    in 41.06 sec: 1.20279 ( -0.03612  0.03627 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.04719e-06 ( -8.70681e-08  8.7319e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -9.676 sec. to   31.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33097     ( -0.260566   0.277675 )
Epeak [keV] : 47.3123      ( -4.70883 5.24831 )
Norm@50keV  : 1.76154E-02    ( -0.00460366   0.00678926 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.52 using 59 PHA bins.
# Reduced chi-squared =         0.8129 for     56 degrees of freedom 
# Null hypothesis probability =   8.402219e-01
 
Photon flux (15-150 keV)    in 41.06 sec: 1.13683 ( -0.04304  0.0433 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.84485e-06 ( -1.1292e-07  1.13772e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    5.268 sec. to    6.268 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.77651     ( -0.0930843   0.0915318 )
Norm@50keV  : 3.01951E-02    ( -0.00169052   0.00167843 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.10 using 59 PHA bins.
# Reduced chi-squared =          1.089 for     57 degrees of freedom 
# Null hypothesis probability =   2.995141e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.12374 ( -0.21209  0.21231 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.78285e-07 ( -1.599e-08  1.61165e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    5.268 sec. to    6.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01966     ( -0.39746   0.43709 )
Epeak [keV] : 60.0747      ( -8.36932 18.0877 )
Norm@50keV  : 7.61236E-02    ( -0.0288086   0.052776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.67 using 59 PHA bins.
# Reduced chi-squared =         0.9049 for     56 degrees of freedom 
# Null hypothesis probability =   6.760537e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.96476 ( -0.22611  0.22635 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.60268e-07 ( -1.80313e-08  1.83249e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 24.344 sec.
Hardness ratio (energy fluence ratio) = 0.956621063029

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

S(15-50 keV)  = 1.552626e-06
S(50-150 keV) = 1.2922151e-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 = -3.642017794637605E-01, IMY = -1.356221535428241E-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:
-427.295400 -408.540500
-239.696000 -9.676000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
206.0618  21.8673    2.6  58.4 -171.7   5.2825   4.5 ------	UNKNOWN                       
143.2927  28.6510    3.0  41.2  -98.0   4.2448   3.8 ------	UNKNOWN

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

Time interval of the image:
-9.676000 12.204600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
199.6916  62.2971    0.2  21.2  159.6   4.7736  70.0 ------	UNKNOWN                       
189.8005  19.7735    2.2  55.7 -153.7   1.5486   5.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
55.404620 962.350700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6205  35.4400   24.0  43.0  124.6  -1.0657  -0.5    9.9	Her X-1                       
 49.2633  60.3147    2.8  55.3    5.1   8.1982   4.1 ------	UNKNOWN                       
 94.1333  74.3180    3.3  35.0   -4.6   2.4068   3.5 ------	UNKNOWN                       
215.1824  12.2801    2.6  51.2 -177.2   6.0958   4.5 ------	UNKNOWN                       
 88.4414  55.3760    2.6  50.7  -20.8   5.0558   4.4 ------	UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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