GRB121117A

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 Sep 10 22:31:03 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger538696
======================================================================

  Trigger: 00538696      Segment: 000

  BAT Trigger Time: 374835066.88   [s; MET]
      Trigger Stop: 374835067.904   [s; MET]
               UTC: 2012-11-17T08:50:56.996980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 31.6352009882339   Dec: 7.37901368067297  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.28
     Image Trigger?:     NO
     Rate S/N Ratio:     21.8174242292714  [ if not an image trigger ]
     Image S/N Ratio:    10.28

  Analysis Position:   [ source = BAT ]
    RA: 31.6352009882339   Dec: 7.37901368067297  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 31.6186703122764   Dec: 7.42895249018853  [deg; J2000]  
        { 02h 06m 28.5s , +07d 25' 44.2" }
         +/- 1.04206187415201 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.331063196010362 [arcmin] (formal 1-sigma fit error)
    SNR: 28.67848648438
 
  Angular difference between the analysis and refined position is 3.153632 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 23.2999999523163 +/- 2.89771908739386
        Measured from: -1.4200000166893
                   to: 21.879999935627     [s; relative to TRIGTIME]
     T50: 8.3999999165535 +/- 1.37173321530373
        Measured from: 1.15200001001358
                   to: 9.55199992656708     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.34799998998642     
                   to: 3.34799998998642     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.84799998998642     
                   to: 24.755999982357     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.372314   0.603172   0.536240   0.141777
           0.030254   0.032473   0.029888   0.027509 [error]
 Peak      0.027913   0.049752   0.045057   0.014827
           0.005678   0.006262   0.006037   0.005228 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   29.604   -4.848   24.756
T90    23.300   -1.420   21.880
T50     8.400    1.152    9.552
Peak    1.000    2.348    3.348
 
 
====== 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      -1.227    -0.102      0.103       -           -               -         3.61e-03     -2.11e-04          2.11e-04      45.440   57
CPL     -0.718    -0.401      0.444      130.751     -38.541       254.409      6.40e-03     -2.27e-03          3.96e-03      40.600   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      -1.043     -0.225     0.231       -           -               -         8.97e-03     -1.18e-03          1.18e-03      43.470   57
CPL     -0.632     -0.525     1.096      175.233    -175.233      -175.233      1.42e-02        N/A               N/A         42.870   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   1.06e-07  2.30e-07  3.93e-07  1.55e-06  1.08e-06  2.28e-06   erg/cm2
      90%_error_low -1.12e-08 -1.48e-08 -2.85e-08 -2.35e-07 -7.15e-08 -2.56e-07   erg/cm2
      90%_error_hi   1.16e-08  1.48e-08  2.84e-08  2.63e-07  7.20e-08  2.81e-07   erg/cm2
Peak flux       PL   2.39e-01  3.15e-01  3.06e-01  5.31e-01  1.04e+00  1.39e+00   ph/cm2/s
      90%_error_low -5.86e-02 -4.97e-02 -4.64e-02 -1.53e-01 -1.38e-01 -2.03e-01   ph/cm2/s
      90%_error_hi   6.32e-02  4.88e-02  4.58e-02  1.90e-01  1.38e-01  2.13e-01   ph/cm2/s
 
Fluence        CPL   9.60e-08  2.41e-07  4.07e-07  7.50e-07  1.03e-06  1.49e-06   erg/cm2
      90%_error_low -1.35e-08 -1.73e-08 -3.14e-08 -3.01e-07 -8.00e-08 -3.07e-07   erg/cm2
      90%_error_hi   1.37e-08  1.77e-08  3.19e-08  5.56e-07  8.00e-08  5.53e-07   erg/cm2
Peak flux      CPL   2.20e-01  3.27e-01  3.19e-01  3.31e-01  1.02e+00  1.20e+00   ph/cm2/s
      90%_error_low -7.05e-02 -5.59e-02 -5.33e-02 -2.06e-01 -1.43e-01 -2.57e-01   ph/cm2/s
      90%_error_hi   7.32e-02  5.87e-02  5.54e-02  2.53e-01  1.42e-01  3.06e-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
   31.6187     7.4290   0.0067     5.6336   131.6612         1.4761689     28.678 TRIG_00538696                 
 
Foreground time interval of the image:
 -4.848  14.021 (delta_t =  18.869 [sec])
Background time interval of the image:
-239.880  -4.848 (delta_t = 235.032 [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   -4.848 sec. to   24.756 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22716     ( -0.102188   0.102705 )
Norm@50keV  : 3.61432E-03    ( -0.000210844   0.000210766 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.44 using 59 PHA bins.
# Reduced chi-squared =         0.7972 for     57 degrees of freedom 
# Null hypothesis probability =   8.647746e-01
 
Photon flux (15-150 keV)    in 29.6 sec: 0.425944 ( -0.02518  0.0252 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07739e-06 ( -7.14707e-08  7.19881e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.848 sec. to   24.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.717729     ( -0.401011   0.444129 )
Epeak [keV] : 130.751      ( -38.5407 254.409 )
Norm@50keV  : 6.39883E-03    ( -0.00226583   0.00395953 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.60 using 59 PHA bins.
# Reduced chi-squared =         0.7250 for     56 degrees of freedom 
# Null hypothesis probability =   9.395139e-01
 
Photon flux (15-150 keV)    in 29.6 sec: 0.415507 ( -0.026498  0.026464 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03331e-06 ( -8.00076e-08  8.00121e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    2.348 sec. to    3.348 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.04305     ( -0.224571   0.231093 )
Norm@50keV  : 8.96708E-03    ( -0.00118143   0.00118087 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.47 using 59 PHA bins.
# Reduced chi-squared =         0.7626 for     57 degrees of freedom 
# Null hypothesis probability =   9.066785e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.03514 ( -0.137905  0.13804 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.55388e-08 ( -1.42202e-08  1.43922e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    2.348 sec. to    3.348 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.632284     ( -0.524829   1.09593 )
Epeak [keV] : 175.233      ( -175.247 -175.247 )
Norm@50keV  : 1.42119E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.87 using 59 PHA bins.
# Reduced chi-squared =         0.7656 for     56 degrees of freedom 
# Null hypothesis probability =   9.013033e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.01937 ( -0.143126  0.14237 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.25252e-08 ( -1.62488e-08  1.58151e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 23.3 sec.
Hardness ratio (energy fluence ratio) = 1.7086376439

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

S(15-50 keV)  = 3.358148e-07
S(50-150 keV) = 7.415614e-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 = -6.557039305708190E-02, IMY = -7.369490560028179E-02

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:
-239.880000 -4.848000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 13.0976 -25.8087    3.3  36.5 -128.4   1.2004   3.5 ------	UNKNOWN                       
 40.1954 -48.9399    3.0  58.7 -159.1   5.5084   3.9 ------	UNKNOWN                       
 37.0708 -48.6900    2.7  57.9 -156.8   5.5866   4.3 ------	UNKNOWN

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

Time interval of the image:
-4.848000 14.020600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 31.6187   7.4289    0.4   5.6  131.7   1.4762  28.7 ------	UNKNOWN                       
 21.6096 -37.9665    2.3  46.6 -143.4   0.6187   5.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
36.020600 302.210000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
355.3764  50.8920    3.3  52.8    3.8   2.9796   3.5 ------	UNKNOWN                       
339.0119  35.0182    2.6  55.5  -20.5   4.5811   4.5 ------	UNKNOWN                       
 42.8098 -49.7870    2.9  58.0 -156.8   6.7432   4.0 ------	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