GRB151118A: 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 Dec 13 15:52:37 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger664078
======================================================================

  Trigger: 00664078      Segment: 000

  BAT Trigger Time: 469508805.44   [s; MET]
      Trigger Stop: 469508805.952   [s; MET]
               UTC: 2015-11-18T03:06:30.010020    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 57.1581445545425   Dec: 65.8686019549024  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.82
     Image Trigger?:     NO
     Rate S/N Ratio:     11.916375287813  [ if not an image trigger ]
     Image S/N Ratio:    7.82

  Analysis Position:   [ source = BAT ]
    RA: 57.1581445545425   Dec: 65.8686019549024  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 57.1709843798993   Dec: 65.8888600983408  [deg; J2000]  
        { 03h 48m 41.0s , +65d 53' 19.9" }
         +/- 1.41353296197743 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.584449960780996 [arcmin] (formal 1-sigma fit error)
    SNR: 18.5522081488074
 
  Angular difference between the analysis and refined position is 1.255601 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 23.5680000185966 +/- 10.6794936132401
        Measured from: 0.319999992847443
                   to: 23.8880000114441     [s; relative to TRIGTIME]
     T50: 5.60000002384186 +/- 2.98450397535287
        Measured from: 4.11199998855591
                   to: 9.71200001239777     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.69200003147125     
                   to: 7.69200003147125     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.015999972820282     
                   to: 30.8159999847412     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.245370   0.352183   0.209007   0.023798
           0.029954   0.031131   0.026878   0.023260 [error]
 Peak      0.043388   0.069401   0.034997   0.005486
           0.005957   0.006511   0.005582   0.004549 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   30.800    0.016   30.816
T90    23.568    0.320   23.888
T50     5.600    4.112    9.712
Peak    1.000    6.692    7.692
 
 
====== 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      -1.707    -0.194      0.188       -           -               -         1.66e-03     -2.02e-04          1.99e-04      49.680   57
CPL     -1.280    -0.392      0.886       73.388     -20.247       -73.388      2.89e-03     -1.56e-03          6.29e-03      48.710   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      -1.671     -0.200     0.193       -           -               -         9.69e-03     -1.26e-03          1.24e-03      65.030   57
CPL     -0.756     -0.846     1.099       59.596     -14.544       149.580      3.16e-02     -3.16e-02          1.03e-01      61.590   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   7.91e-08  1.28e-07  1.57e-07  3.79e-07  4.72e-07  7.43e-07   erg/cm2
      90%_error_low -1.26e-08 -1.37e-08 -2.57e-08 -1.13e-07 -6.01e-08 -1.40e-07   erg/cm2
      90%_error_hi   1.29e-08  1.37e-08  2.59e-08  1.41e-07  6.12e-08  1.63e-07   erg/cm2
Peak flux       PL   4.70e-01  4.28e-01  2.68e-01  2.58e-01  1.27e+00  1.42e+00   ph/cm2/s
      90%_error_low -8.01e-02 -4.97e-02 -4.47e-02 -7.47e-02 -1.47e-01 -1.69e-01   ph/cm2/s
      90%_error_hi   8.31e-02  4.97e-02  4.48e-02  9.10e-02  1.47e-01  1.70e-01   ph/cm2/s
 
Fluence        CPL   7.60e-08  1.35e-07  1.56e-07  1.78e-07  4.49e-07  5.45e-07   erg/cm2
      90%_error_low -1.39e-08 -1.80e-08 -2.90e-08 -1.26e-07 -7.06e-08 -1.48e-07   erg/cm2
      90%_error_hi   1.40e-08  1.91e-08  2.77e-08  2.38e-07  7.18e-08  2.61e-07   erg/cm2
Peak flux      CPL   4.26e-01  4.76e-01  2.73e-01  8.69e-02  1.24e+00  1.26e+00   ph/cm2/s
      90%_error_low -9.09e-02 -6.73e-02 -5.41e-02 -5.95e-02 -1.51e-01 -1.65e-01   ph/cm2/s
      90%_error_hi   9.29e-02  7.15e-02  5.13e-02  1.50e-01  1.51e-01  1.92e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   57.1710    65.8889   0.0103    15.8922    12.6464         0.7043404     18.552 TRIG_00664078                 
 
Foreground time interval of the image:
  0.016  11.061 (delta_t =  11.045 [sec])
Background time interval of the image:
-239.440   0.016 (delta_t = 239.456 [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    0.016 sec. to   30.816 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70705     ( -0.193742   0.187894 )
Norm@50keV  : 1.65536E-03    ( -0.000202466   0.000198958 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.68 using 59 PHA bins.
# Reduced chi-squared =         0.8715 for     57 degrees of freedom 
# Null hypothesis probability =   7.435738e-01
 
Photon flux (15-150 keV)    in 30.8 sec: 0.220404 ( -0.023554  0.023559 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.71868e-07 ( -6.00736e-08  6.12098e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.016 sec. to   30.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27968     ( -0.391721   0.886019 )
Epeak [keV] : 73.3883      ( -20.2481 -73.3895 )
Norm@50keV  : 2.88540E-03    ( -0.00155845   0.00628865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.71 using 59 PHA bins.
# Reduced chi-squared =         0.8698 for     56 degrees of freedom 
# Null hypothesis probability =   7.445537e-01
 
Photon flux (15-150 keV)    in 30.8 sec: 0.216772 ( -0.024402  0.024363 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.49458e-07 ( -7.05967e-08  7.17973e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    6.692 sec. to    7.692 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.67134     ( -0.200448   0.193129 )
Norm@50keV  : 9.68792E-03    ( -0.00126216   0.00124193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.03 using 59 PHA bins.
# Reduced chi-squared =          1.141 for     57 degrees of freedom 
# Null hypothesis probability =   2.172657e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.27410 ( -0.14721  0.14724 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.99311e-08 ( -1.22939e-08  1.25114e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    6.692 sec. to    7.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.756216     ( -0.84582   1.09916 )
Epeak [keV] : 59.5961      ( -14.5435 149.581 )
Norm@50keV  : 3.15849E-02    ( -0.0315854   0.102726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.59 using 59 PHA bins.
# Reduced chi-squared =          1.100 for     56 degrees of freedom 
# Null hypothesis probability =   2.830847e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.23740 ( -0.15096  0.15109 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.23323e-08 ( -1.37945e-08  1.43062e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 23.568 sec.
Hardness ratio (energy fluence ratio) = 1.22518037332

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

S(15-50 keV)  = 2.0720096e-07
S(50-150 keV) = 2.646756e-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 = 2.778035389612715E-01, IMY = -6.233258369100032E-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:
-239.440000 0.016000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1345  40.8853    4.6  46.1 -136.8   1.4287   2.5    4.2	Cyg X-3                       
326.2672  38.4518  582.1  40.1 -155.7  -0.0072  -0.0    9.0	Cyg X-2                       
  5.6792  29.9108    2.7  34.9  148.6   1.5846   4.2 ------	UNKNOWN                       
322.0381  36.1673    2.6  43.9 -153.3   1.6937   4.5 ------	UNKNOWN                       

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

Time interval of the image:
0.016000 11.060590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0467  40.9155    3.9  46.1 -136.7   0.2937   3.0    3.6	Cyg X-3                       
326.0221  38.4022   42.8  40.3 -155.5  -0.0148  -0.3    8.5	Cyg X-2                       
353.3886  16.2812    2.8  50.8  160.4   0.5413   4.1 ------	UNKNOWN                       
 57.1709  65.8888    0.6  15.9   12.6   0.7043  18.6 ------	UNKNOWN                       
338.6197  48.6469    2.0  26.6 -157.6   0.2123   5.8 ------	UNKNOWN                       
149.1559  71.0244    1.9  40.9  -30.3   0.3556   6.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
50.260610 962.730000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1202  38.3218    5.5  55.9 -166.3 -16.7546  -2.1    2.4	Cyg X-2                       
 74.8019  55.2524    3.0  13.6   37.7   7.1598   3.8 ------	UNKNOWN                       
317.7181  38.7658    3.7  58.7 -159.2  36.5031   3.2 ------	UNKNOWN