batgrbproduct analysis for trigger=874475

batgrbproduct Analysis for Trigger=874475

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): Mon Dec 17 14:06:16 EST 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger874475
======================================================================

  Trigger: 00874475      Segment: 000

  BAT Trigger Time: 565531749.888   [s; MET]
      Trigger Stop: 565531750.912   [s; MET]
               UTC: 2018-12-03T12:08:47.866980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 108.368923591337   Dec: -39.7690778271218  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.24
     Image Trigger?:     NO
     Rate S/N Ratio:     14.8323969741913  [ if not an image trigger ]
     Image S/N Ratio:    8.24

  Flight Position:   [ source = BAT ]
    RA: 108.368923591337   Dec: -39.7690778271218  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 108.337169327052   Dec: -39.7783831251791  [deg; J2000]  
        { 07h 13m 20.9s , -39d 46' 42.2" }
         +/- 1.29356544984538 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.413170845025074 [arcmin] (formal 1-sigma fit error)
    SNR: 21.058171347652
 
  Angular difference between Flight and Ground position is 1.567162 arcmin
 
  Partial Coding Fraction: 0.8359375    [ including projection effects ]

  Duration
     T90: 15.0599999427795 +/- 1.76298946536287
        Measured from: -0.812000036239624
                   to: 14.2479999065399     [s; relative to TRIGTIME]
     T50: 8.39199995994568 +/- 0.950696620199982
        Measured from: 1.49199998378754
                   to: 9.88399994373322     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.0239999294281     
                   to: 2.0239999294281     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.7960000038147     
                   to: 15.8519999980927     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.463087   0.544931   0.320919   0.074589
           0.034495   0.036360   0.031140   0.026034 [error]
 Peak      0.031797   0.050128   0.046322   0.022838
           0.008435   0.008997   0.007820   0.006418 [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 1.44e-07 2.19e-07 2.49e-07 5.38e-07 7.71e-07 1.15e-06   erg/cm2
              Error 1.71e-08 1.68e-08 3.07e-08 1.36e-07 7.06e-08 1.66e-07   erg/cm2
Peak flux Power-law 2.81e-01 3.37e-01 2.93e-01 4.34e-01 1.06e+00 1.34e+00   ph/cm2/s
              Error 1.11e-01 7.65e-02 6.44e-02 2.24e-01 2.03e-01 2.65e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.41e-07 2.22e-07 2.49e-07 3.85e-07 7.55e-07 9.97e-07   erg/cm2
              Error 1.89e-08 2.12e-08 3.18e-08 2.84e-07 8.19e-08 2.32e-07   erg/cm2
Peak flux Cutoff-PL 2.90e-01 3.38e-01 2.89e-01 4.46e-01 1.07e+00 1.34e+00   ph/cm2/s
              Error 1.13e-01 7.90e-02 6.67e-02 -------- 2.12e-01 2.76e-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    1.814    0.145    -      -           4.75e-03 4.25e-04   56.000 57
CPL   1.629    0.587      89.4    0.0      6.01e-03 0.00e+00   55.670 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.204    0.375    -      -           9.05e-03 1.66e-03   57.840 57
CPL   1.202    0.378    10000.0    0.0      9.10e-03 -3.72e-03   57.860 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: 18.816000 sec.
T50 in the 50-300 keV band: 9.728000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   17.648   -1.796   15.852
T90    15.060   -0.812   14.248
T50     8.392    1.492    9.884
Peak    1.000    1.024    2.024

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  108.3372   -39.7784   0.0091    21.6201   156.9337         1.4409948     21.058 TRIG_00874475                 
 
Foreground time interval of the image:
 -1.796  15.852 (delta_t =  17.648 [sec])
Background time interval of the image:
-298.187 -277.496 (delta_t =  20.691 [sec])
-239.888  -1.796 (delta_t = 238.092 [sec])

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 1.024000

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 1.024000

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 1.024000

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   -1.796 sec. to   15.852 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.81411     ( -0.143235   0.147382 )
Norm@50keV  : 4.74708E-03    ( -0.000428446   0.000421681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.00 using 59 PHA bins.
# Reduced chi-squared =         0.9825 for     57 degrees of freedom 
# Null hypothesis probability =   5.126057e-01
 
Photon flux (15-150 keV)    in 17.65 sec: 0.657787 ( -0.051072  0.0511 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.71107e-07 ( -7.0145e-08  7.11498e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.796 sec. to   15.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.62861     ( -0.611539   0.562442 )
Epeak [keV] : 89.3582      (   )
Norm@50keV  : 6.01123E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.67 using 59 PHA bins.
# Reduced chi-squared =         0.9941 for     56 degrees of freedom 
# Null hypothesis probability =   4.873852e-01
 
Photon flux (15-150 keV)    in 17.65 sec: 0.652226 ( -0.053692  0.05351 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.56214e-07 ( -8.25016e-08  8.12662e-08 ) ergs/cm2

Band function

Time interval is from   -1.796 sec. to   15.852 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 11.0556  (-1.0343  1.16739)
R^2/D10^2   : 0.209447  (-0.0656458   0.0934127)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          93.59 using 59 PHA bins.
# Reduced chi-squared =          1.642 for     57 degrees of freedom 
# Null hypothesis probability =   1.615763e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.450e-08   1.302e-08
25- 50  2.690e-07   2.453e-08
50-150  1.864e-07   4.058e-08
15-150  5.499e-07   5.313e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 97.7381       (-25.2988      42.4819)
Norm        : 2.90688       (-0.312833     0.370062)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.50 using 59 PHA bins.
# Reduced chi-squared =         0.9913 for     57 degrees of freedom 
# Null hypothesis probability =   4.937133e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.341e-07   1.594e-08
25- 50  2.308e-07   2.162e-08
50-150  3.691e-07   1.341e-07
15-150  7.340e-07   1.446e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.99065        (-1.71697      1.60364)
R1^2/D10^2  : 0.860126        (-0.421062      1.38354)
kT2 [keV]   : 26.7315        (-8.35672      20.9213)
R2^2/D10^2  : 5.68440E-03    (-0.00471038   0.0181058)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.60 using 59 PHA bins.
# Reduced chi-squared =          1.047 for     55 degrees of freedom 
# Null hypothesis probability =   3.793749e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.310e-07   3.377e-08
25- 50  2.330e-07   5.922e-08
50-150  3.951e-07   1.981e-07
15-150  7.591e-07   2.589e-07

Peak spectrum fit

Power-law model

Time interval is from    1.024 sec. to    2.024 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20429     ( -0.383372   0.365754 )
Norm@50keV  : 9.05344E-03    ( -0.00165752   0.00165735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.84 using 59 PHA bins.
# Reduced chi-squared =          1.015 for     57 degrees of freedom 
# Null hypothesis probability =   4.439689e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.06333 ( -0.20264  0.20346 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.17508e-08 ( -1.90097e-08  1.92203e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.024 sec. to    2.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20155     ( -0.412172   0.344458 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 9.09559E-03    ( -0.00166515   -0.00909559 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.86 using 59 PHA bins.
# Reduced chi-squared =          1.033 for     56 degrees of freedom 
# Null hypothesis probability =   4.063147e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.06976 ( -0.218146  0.20498 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.09829e-08 ( -1.82887e-08  1.99116e-08 ) ergs/cm2

Band function

Time interval is from    1.024 sec. to    2.024 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 24.5068  (-8.54227  13.3491)
R^2/D10^2   : 2.40969E-02  (-0.0168094   0.0688951)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.85 using 59 PHA bins.
# Reduced chi-squared =          1.278 for     57 degrees of freedom 
# Null hypothesis probability =   7.683074e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.541e-09   1.308e-09
25- 50  1.427e-08   6.148e-09
50-150  6.370e-08   2.807e-08
15-150  8.050e-08   2.699e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-70.2313      -200)
Norm        : 4.38443       (-0.823258     0.823258)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.79 using 59 PHA bins.
# Reduced chi-squared =          1.084 for     57 degrees of freedom 
# Null hypothesis probability =   3.091358e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.092e-08   6.335e-09
25- 50  2.101e-08   1.215e-08
50-150  4.608e-08   2.635e-08
15-150  7.802e-08   4.503e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.11320        (-2.28181      2.82818)
R1^2/D10^2  : 1.17496        (-0.833849      3.27326)
kT2 [keV]   : 57.4742        (-26.1665      -57.4692)
R2^2/D10^2  : 2.09050E-03    (-0.00175471   0.00800197)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.01 using 59 PHA bins.
# Reduced chi-squared =         0.9821 for     55 degrees of freedom 
# Null hypothesis probability =   5.122963e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.038e-08   5.900e-09
25- 50  1.874e-08   1.022e-08
50-150  7.206e-08   3.882e-08
15-150  1.012e-07   5.230e-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: 1.81411     ( -0.143235   0.147382 )
Norm@50keV  : 4.74708E-03    ( -0.000428446   0.000421681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.00 using 59 PHA bins.
# Reduced chi-squared =         0.9825 for     57 degrees of freedom 
# Null hypothesis probability =   5.126057e-01
 
Photon flux (15-150 keV)    in 17.65 sec: 0.657752 ( -0.0510675  0.0510961 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.70987e-07 ( -7.02253e-08  7.11556e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.62860     ( -0.611538   0.562544 )
Epeak [keV] : 89.3568      (   )
Norm@50keV  : 6.01127E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.67 using 59 PHA bins.
# Reduced chi-squared =         0.9941 for     56 degrees of freedom 
# Null hypothesis probability =   4.873852e-01
 
Photon flux (15-150 keV)    in 17.65 sec: 0.652096 ( -0.05367  0.026751 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.56415e-07 ( -8.26179e-08  8.11759e-08 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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)  = 2.19e-07
S(50-100 keV) = 2.49e-07

T90 vs. Hardness ratio plot

T90                                   = 15.0599999427795 sec.
Hardness ratio (energy fluence ratio) = 1.13699

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.17674
Count Ratio (50-100 keV) / (15-25 keV) = 0.692999

Mask shadow pattern

IMX = -3.646480396765555E-01, IMY = -1.552817912817654E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-298.187400 -277.496100
-239.888000 -1.796000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4639 -40.5188   11.5  35.4 -169.6   0.3349   1.0    3.7	Vela X-1                      
170.0526 -60.7291    0.0  41.7 -122.8  -1.1338  -1.7   10.0	Cen X-3                       
 38.3144 -27.1524    2.5  44.3   34.0   2.8592   4.6 ------	UNKNOWN                       
 53.0195 -29.0431    2.2  35.3   49.0   2.9732   5.3 ------	UNKNOWN                       
156.7354 -37.4734    3.0  49.5 -156.0   2.5124   3.9 ------	UNKNOWN                       
159.6455 -38.9094    3.0  50.1 -152.5   2.6223   3.9 ------	UNKNOWN

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

Time interval of the image:
-1.796000 15.852000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5094 -40.6794    5.6  35.4 -169.4   0.1787   2.1    7.5	Vela X-1                      
170.1437 -60.4841    9.3  41.8 -123.1   0.1908   1.2    9.8	Cen X-3                       
108.3372 -39.7784    0.5  21.6  156.9   1.4411  21.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
60.012590 962.201700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4888 -40.6407    5.5  20.7 -131.1   1.7595   2.1    5.5	Vela X-1                      
102.5984   0.0856    3.6  40.2  118.8   9.0329   3.3 ------	UNKNOWN                       
121.8017   6.1901    3.7  47.6  146.0   8.2856   3.1 ------	UNKNOWN                       
 75.0653 -75.7406    3.6  38.9  -39.8   3.4552   3.2 ------	UNKNOWN

Plot creation:
Mon Dec 17 21:02:58 EST 2018