batgrbproduct analysis for trigger=666931

batgrbproduct Analysis for Trigger=666931

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 (local time): Sun Mar 13 22:07:59 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger666931
======================================================================

  Trigger: 00666931      Segment: 000

  BAT Trigger Time: 471409992   [s; MET]
      Trigger Stop: 471410072   [s; MET]
               UTC: 2015-12-10T03:12:56.468160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 65.1823076169024   Dec: -71.2304208518608  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.24
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.24

  Flight Position:   [ source = BAT ]
    RA: 65.1823076169024   Dec: -71.2304208518608  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 65.0855808894804   Dec: -71.2265738004778  [deg; J2000]  
        { 04h 20m 20.5s , -71d 13' 35.7" }
         +/- 1.72137678433548 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.710358999811928 [arcmin] (formal 1-sigma fit error)
    SNR: 14.0007966958866
 
  Angular difference between Flight and Ground position is 1.881780 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 86.9599999785423 +/- 10.6712423189293
        Measured from: -38.7200000286102
                   to: 48.2399999499321     [s; relative to TRIGTIME]
     T50: 60.539999961853 +/- 4.92299257607087
        Measured from: -21.2960000038147
                   to: 39.2439999580383     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 38.8199999928474     
                   to: 39.8199999928474     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -57.1959999799728     
                   to: 52.8000000119209     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.907443   1.084534   0.555872   0.165159
           0.072375   0.075570   0.065892   0.058099 [error]
 Peak      0.023274   0.035441   0.035147   0.016641
           0.007689   0.008245   0.007455   0.006179 [error]

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

======================================================================
 
=== 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   Power-law 2.83e-07 4.23e-07 4.73e-07 1.00e-06 1.48e-06 2.18e-06   erg/cm2
              Error 3.41e-08 3.46e-08 6.25e-08 2.65e-07 1.45e-07 3.29e-07   erg/cm2
Peak flux Power-law 2.06e-01 2.53e-01 2.26e-01 3.48e-01 8.06e-01 1.03e+00   ph/cm2/s
              Error 8.90e-02 6.80e-02 5.65e-02 1.86e-01 1.87e-01 2.43e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.63e-07 4.64e-07 4.58e-07 2.83e-07 1.36e-06 1.46e-06   erg/cm2
              Error 3.84e-08 4.93e-08 7.44e-08 3.40e-07 1.71e-07 3.85e-07   erg/cm2
Peak flux Cutoff-PL 1.96e-01 2.59e-01 2.32e-01 2.63e-01 8.00e-01 9.51e-01   ph/cm2/s
              Error 9.69e-02 7.61e-02 6.44e-02 2.30e-01 1.90e-01 3.04e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.839    0.149    -      -           1.46e-03 1.42e-04   58.210 57
CPL   1.052    0.730      50.8   28.3      4.13e-03 5.07e-03   53.970 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.166    0.386    -      -           6.90e-03 1.54e-03   39.240 57
CPL   0.919    1.870     234.1    0.0      9.09e-03 2.63e-02   39.140 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 33.024000 sec.
T50 in the 50-300 keV band: 25.600000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  109.996  -57.196   52.800
T90    86.960  -38.720   48.240
T50    60.540  -21.296   39.244
Peak    1.000   38.820   39.820

Click here for the BAT GCN circular template

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   65.0856   -71.2266   0.0137    24.1221   -87.4798         1.7895174     14.001 TRIG_00666931                 
 
Foreground time interval of the image:
-10.499  52.800 (delta_t =  63.299 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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  -57.196 sec. to   52.800 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.83910     ( -0.146357   0.151105 )
Norm@50keV  : 1.46385E-03    ( -0.000142808   0.000140708 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.21 using 59 PHA bins.
# Reduced chi-squared =          1.021 for     57 degrees of freedom 
# Null hypothesis probability =   4.306591e-01
 
Photon flux (15-150 keV)    in 110 sec: 0.204866 ( -0.016841  0.016846 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48106e-06 ( -1.4412e-07  1.46556e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -57.196 sec. to   52.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.05199     ( -0.798868   0.660999 )
Epeak [keV] : 50.8344      ( -10.0178 46.6702 )
Norm@50keV  : 4.12787E-03    ( -0.00236886   0.00776921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.97 using 59 PHA bins.
# Reduced chi-squared =         0.9638 for     56 degrees of freedom 
# Null hypothesis probability =   5.520648e-01
 
Photon flux (15-150 keV)    in 110 sec: 0.198449 ( -0.01765  0.017649 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.35989e-06 ( -1.66797e-07  1.75094e-07 ) ergs/cm2

Band function

Time interval is from  -57.196 sec. to   52.800 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -2.43672E-02   ( -1.26941   0.0695026 )
beta        : -2.20340    ( 2.20821   0.351528 )
Epeak [keV] : 37.2187      ( -14.4129 31.0385 )
Norm@50keV   : 2.07650E-02    ( -0.0169439   75.1281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.86 using 59 PHA bins.
# Reduced chi-squared =         0.9611 for     55 degrees of freedom 
# Null hypothesis probability =   5.568641e-01
 
Photon flux (15-150 keV)    in 110 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 10.6978  (-0.971154  1.08447)
R^2/D10^2   : 7.55207E-02  (-0.0230934   0.0326894)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.57 using 59 PHA bins.
# Reduced chi-squared =          1.291 for     57 degrees of freedom 
# Null hypothesis probability =   6.895358e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.974e-07   2.838e-08
25- 50  5.384e-07   5.269e-08
50-150  3.405e-07   7.458e-08
15-150  1.076e-06   1.094e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 85.5786       (-21.2547      34.5361)
Norm        : 0.945886       (-0.110223     0.129382)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.24 using 59 PHA bins.
# Reduced chi-squared =         0.9516 for     57 degrees of freedom 
# Null hypothesis probability =   5.791934e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.710e-07   3.427e-08
25- 50  4.532e-07   4.208e-08
50-150  6.686e-07   2.746e-07
15-150  1.393e-06   2.414e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.18489        (-2.34862      2.07173)
R1^2/D10^2  : 0.238751        (-0.125152      0.557082)
kT2 [keV]   : 22.5075        (-8.15536      39.0158)
R2^2/D10^2  : 2.85743E-03    (-0.00266877   0.00932818)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.03 using 59 PHA bins.
# Reduced chi-squared =         0.9823 for     55 degrees of freedom 
# Null hypothesis probability =   5.117256e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.527e-07   8.036e-08
25- 50  4.782e-07   1.570e-07
50-150  6.501e-07   3.284e-07
15-150  1.381e-06   5.171e-07

Peak spectrum fit

Power-law model

Time interval is from   38.820 sec. to   39.820 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16568     ( -0.397692   0.374986 )
Norm@50keV  : 6.90131E-03    ( -0.0015438   0.00154176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.24 using 59 PHA bins.
# Reduced chi-squared =         0.6885 for     57 degrees of freedom 
# Null hypothesis probability =   9.650001e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.806380 ( -0.186257  0.18707 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.07213e-08 ( -1.70478e-08  1.72255e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   38.820 sec. to   39.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.919487     ( -1.72428   2.01579 )
Epeak [keV] : 234.083      ( -234.11 -234.11 )
Norm@50keV  : 9.08545E-03    ( -0.00363005   0.0489876 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.14 using 59 PHA bins.
# Reduced chi-squared =         0.6990 for     56 degrees of freedom 
# Null hypothesis probability =   9.576153e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.800281 ( -0.189388  0.189632 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.97028e-08 ( -1.84686e-08  1.76305e-08 ) ergs/cm2

Band function

Time interval is from   38.820 sec. to   39.820 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.95825   ( -4.95825   -4.95825 )
beta        : -1.33744    ( -0.616382   0.464875 )
Epeak [keV] : 30.0454      ( -30.0454 13.0388 )
Norm@50keV   : 183.807    ( -40.5268   2.32399e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.00 using 59 PHA bins.
# Reduced chi-squared =         0.6908 for     55 degrees of freedom 
# Null hypothesis probability =   9.609260e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 18.8447  (-5.20419  8.19589)
R^2/D10^2   : 4.52284E-02  (-0.031273   0.088451)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.52 using 59 PHA bins.
# Reduced chi-squared =         0.7635 for     57 degrees of freedom 
# Null hypothesis probability =   9.057315e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.166e-09   1.583e-09
25- 50  1.514e-08   7.017e-09
50-150  3.945e-08   1.893e-08
15-150  5.776e-08   2.627e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-79.3653      -200)
Norm        : 3.35238       (-0.766968     0.766968)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.91 using 59 PHA bins.
# Reduced chi-squared =         0.7353 for     57 degrees of freedom 
# Null hypothesis probability =   9.328638e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.352e-09   4.889e-09
25- 50  1.607e-08   9.415e-09
50-150  3.523e-08   2.103e-08
15-150  5.965e-08   3.499e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.11037        (-4.82678      7.89351)
R1^2/D10^2  : 0.333778        (-0.278558      3.36536)
kT2 [keV]   : 41.3467        (-41.3876      -41.3881)
R2^2/D10^2  : 3.01237E-03    (-0.00283324   0.0337492)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.47 using 59 PHA bins.
# Reduced chi-squared =         0.6994 for     55 degrees of freedom 
# Null hypothesis probability =   9.558438e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.076e-09   3.638e-09
25- 50  1.622e-08   8.970e-09
50-150  4.911e-08   2.751e-08
15-150  7.141e-08   3.516e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.68659     ( -0.175897   0.180601 )
Norm@50keV  : 1.70551E-03    ( -0.000196275   0.000193526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.07 using 59 PHA bins.
# Reduced chi-squared =         0.8785 for     57 degrees of freedom 
# Null hypothesis probability =   7.303942e-01
 
Photon flux (15-150 keV)    in 63.3 sec: 0.225461 ( -0.0232662  0.0232749 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00067e-06 ( -1.20541e-07  1.22498e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.886151     ( -0.982308   0.792745 )
Epeak [keV] : 60.7861      ( -14.6726 461.977 )
Norm@50keV  : 4.79530E-03    ( -0.00303267   0.0122707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.13 using 59 PHA bins.
# Reduced chi-squared =         0.8417 for     56 degrees of freedom 
# Null hypothesis probability =   7.946877e-01
 
Photon flux (15-150 keV)    in 63.3 sec: 0.218811 ( -0.024239  0.024194 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.20901e-07 ( -1.38184e-07  1.45033e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.864107   ( -2.5764   -1.08701 )
beta        : -1.99842    ( 1.99516   0.342035 )
Epeak [keV] : 35.9334      ( -12.229 71.3964 )
Norm@50keV   : 8.08848E-02    ( -0.0779799   57.4429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.92 using 59 PHA bins.
# Reduced chi-squared =         0.8350 for     55 degrees of freedom 
# Null hypothesis probability =   8.033745e-01
 
Photon flux (15-150 keV)    in 63.3 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 4.23e-07
S(50-100 keV) = 4.73e-07

T90 vs. Hardness ratio plot

T90                                   = 86.9599999785423 sec.
Hardness ratio (energy fluence ratio) = 1.1182

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.19515
Count Ratio (50-100 keV) / (15-25 keV) = 0.61257

Mask shadow pattern

IMX = 1.969010630520137E-02, IMY = 4.473512407426649E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 80.000000

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:

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

Time interval of the image:
-10.499410 52.800000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5104 -40.5548   12.3  46.7 -163.6   0.1815   0.9    0.8	Vela X-1                      
 10.6577 -29.1311    2.7  48.3   -0.7   0.8453   4.2 ------	UNKNOWN                       
 65.0856 -71.2266    0.8  24.1  -87.5   1.7897  14.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
134.500600 963.085500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4676 -40.4474    6.8  45.8  166.9  -2.2223  -1.7    7.0	Vela X-1                      
170.5281 -60.4900   12.0  38.6 -150.0  -0.8794  -1.0   10.1	Cen X-3                       
186.8396 -62.8769  116.5  40.1 -137.5   0.1055   0.1    8.1	GX 301-2                      
 91.1064 -32.5657    3.0  41.1  113.7   9.4285   3.9 ------	UNKNOWN                       
145.0184 -42.1137    4.5  47.4  176.8   3.2396   2.6 ------	UNKNOWN                       
174.1095 -39.3265    4.6  58.7 -159.3  12.1267   2.5 ------	UNKNOWN                       
317.3837 -47.5726    3.9  50.8  -44.4   8.8640   3.0 ------	UNKNOWN                       
203.5183 -57.5415    2.7  48.0 -129.1  13.3340   4.3 ------	UNKNOWN

Plot creation:
Fri Mar 18 13:47:40 EDT 2016