batgrbproduct analysis for trigger=974827

batgrbproduct Analysis for Trigger=974827

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 v2.47
    Process Start Time (local time): Mon Jun 29 14:53:54 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger974827
======================================================================

  Trigger: 00974827      Segment: 000

  BAT Trigger Time: 612354468.864   [s; MET]
      Trigger Stop: 612354469.376   [s; MET]
               UTC: 2020-05-28T10:27:23.846900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 176.636774868885   Dec: 58.1471189930449  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.17
     Image Trigger?:     NO
     Rate S/N Ratio:     15.3948043183407  [ if not an image trigger ]
     Image S/N Ratio:    9.17

  Flight Position:   [ source = BAT ]
    RA: 176.636774868885   Dec: 58.1471189930449  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 176.635874179899   Dec: 58.1849494187847  [deg; J2000]  
        { 11h 46m 32.6s , +58d 11' 05.8" }
         +/- 0.686444883629976 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.229830573673835 [arcmin] (formal 1-sigma fit error)
    SNR: 52.064157854471
 
  Angular difference between Flight and Ground position is 2.270005 arcmin
 
  Partial Coding Fraction: 0.625    [ including projection effects ]

  Duration
     T90: 59.9839999675751 +/- 1.92381702054219
        Measured from: 4.74000000953674
                   to: 64.7239999771118     [s; relative to TRIGTIME]
     T50: 24.6319999694824 +/- 0.417612353072037
        Measured from: 28.0600000619888
                   to: 52.6920000314713     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 33.8159999847412     
                   to: 34.8159999847412     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.73199999332428     
                   to: 132.34399998188     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    12.531114  13.062307   6.699846   0.944570
           0.091608   0.093892   0.077326   0.059484 [error]
 Peak      0.607270   0.762010   0.512094   0.097064
           0.013934   0.015551   0.013292   0.007421 [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 4.25e-06 5.42e-06 5.06e-06 8.29e-06 1.76e-05 2.30e-05   erg/cm2
              Error 1.41e-07 1.02e-07 9.92e-08 3.74e-07 2.78e-07 4.29e-07   erg/cm2
Peak flux Power-law 6.07e+00 5.50e+00 3.44e+00 3.28e+00 1.64e+01 1.83e+01   ph/cm2/s
              Error 3.08e-01 1.66e-01 1.14e-01 2.29e-01 4.84e-01 4.92e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.73e-06 5.50e-06 5.22e-06 4.91e-06 1.68e-05 1.93e-05   erg/cm2
              Error 1.91e-07 1.07e-07 1.11e-07 6.80e-07 3.33e-07 7.94e-07   erg/cm2
Peak flux Cutoff-PL 5.38e+00 5.65e+00 3.60e+00 2.06e+00 1.58e+01 1.67e+01   ph/cm2/s
              Error 4.01e-01 1.82e-01 1.35e-01 3.86e-01 5.31e-01 6.98e-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    2.100    0.032    -      -           1.42e-02 2.23e-04    0.000  0
CPL   1.616    0.141      43.1    5.2      2.34e-02 3.38e-03    0.000  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.678    0.049    -      -           1.24e-01 3.36e-03    0.000  0
CPL   1.173    0.215      87.7   18.5      2.15e-01 4.95e-02    0.000  0
 
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: 55.040000 sec.
T50 in the 50-300 keV band: 20.928000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  133.076   -0.732  132.344
T90    59.984    4.740   64.724
T50    24.632   28.060   52.692
Peak    1.000   33.816   34.816

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
  176.6359    58.1849   0.0037    27.6737  -131.8887         4.0130465     52.064 TRIG_00974827                 
 
Foreground time interval of the image:
 -0.732  10.637 (delta_t =  11.369 [sec])
Background time interval of the image:
-239.864  -0.732 (delta_t = 239.132 [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 0.512000

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 0.512000

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 0.512000

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   -0.732 sec. to  132.344 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.10012     ( -0.0316467   0.0316912 )
Norm@50keV  : 1.41594E-02    ( -0.000223325   0.000223313 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 133.1 sec: 2.22797 ( -0.0479  0.04824 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.75137e-05 ( -2.78429e-07  2.78437e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.732 sec. to  132.344 sec.
 XSPEC: quit
 
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.61564     ( -0.14307   0.139017 )
Epeak [keV] : 43.1431      ( -6.09422 4.34973 )
Norm@50keV  : 2.34425E-02    ( -0.00308822   0.00367097 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 133.1 sec: 2.09906 ( -0.05753  0.05822 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.68282e-05 ( -3.32634e-07  3.32589e-07 ) ergs/cm2

Band function

Time interval is from   -0.732 sec. to  132.344 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

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 13.6425  (  )
R^2/D10^2   : 0.271930  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.426e-06   4.792e-08
25- 50  5.167e-06   1.098e-07
50-150  6.246e-06   1.710e-07
15-150  1.284e-05   2.143e-07

Thermal bremsstrahlung (OTTB)

XSPEC12>/*
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 75.9398       (-3.51039      3.79087)
Norm        : 9.84638       (-0.311798     0.32248)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.388e-06   9.184e-08
25- 50  5.506e-06   1.185e-07
50-150  7.500e-06   1.943e-07
15-150  1.639e-05   2.595e-07

Double BB

XSPEC12>/*
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.47840        (-0.38456      0.40182)
R1^2/D10^2  : 3.43831        (-0.728997      0.978688)
kT2 [keV]   : 20.6881        (-0.947925      1.08713)
R2^2/D10^2  : 4.02744E-02    (-0.00811544   0.00927572)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.263e-06   2.110e-07
25- 50  5.537e-06   1.690e-07
50-150  7.488e-06   2.176e-07
15-150  1.629e-05   3.926e-07

Peak spectrum fit

Power-law model

Time interval is from   33.816 sec. to   34.816 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.67787     ( -0.0490161   0.049271 )
Norm@50keV  : 0.124363    ( -0.0033584   0.00335639 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 16.3918 ( -0.4832  0.4846 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15375e-06 ( -3.2274e-08  3.23191e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   33.816 sec. to   34.816 sec.
 XSPEC: quit
 
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.17312     ( -0.220288   0.210198 )
Epeak [keV] : 87.7220      ( -11.9391 25.0829 )
Norm@50keV  : 0.214595    ( -0.0426834   0.0563396 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 15.8069 ( -0.5302  0.5327 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.1183e-06 ( -3.56452e-08  3.55783e-08 ) ergs/cm2

Band function

Time interval is from   33.816 sec. to   34.816 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

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 14.9942  (  )
R^2/D10^2   : 1.75132  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.244e-08   4.725e-09
25- 50  3.274e-07   1.175e-08
50-150  5.010e-07   2.665e-08
15-150  9.108e-07   2.735e-08

Thermal bremsstrahlung (OTTB)

XSPEC12>/*
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 154.691       (-19.7527      21.0798)
Norm        : 66.7447       (-2.16677     2.53511)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.710e-07   9.350e-09
25- 50  3.183e-07   1.680e-08
50-150  6.362e-07   1.415e-07
15-150  1.126e-06   1.558e-07

Double BB

XSPEC12>/*
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.98992        (-0.895077      0.996573)
R1^2/D10^2  : 16.1803        (-5.70585      10.1507)
kT2 [keV]   : 23.2161        (-2.10917      2.9315)
R2^2/D10^2  : 0.279102    (-0.107148   0.133924)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.539e-07   1.610e-08
25- 50  3.212e-07   1.715e-08
50-150  6.242e-07   4.440e-08
15-150  1.099e-06   6.690e-08

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

Power-law model

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.91694     ( -0.0599326   0.060474 )
Norm@50keV  : 2.09236E-02    ( -0.000695098   0.000692789 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 11.37 sec: 3.02459 ( -0.103807  0.104177 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18764e-06 ( -7.17768e-08  7.1927e-08 ) ergs/cm2

Cutoff power-law model

 XSPEC: quit
 
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.43306     ( -0.26047   0.245695 )
Epeak [keV] : 57.4253      ( -7.09243 12.6439 )
Norm@50keV  : 3.66498E-02    ( -0.00888265   0.0126251 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 11.37 sec: 2.91653 ( -0.11529  0.11581 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.10294e-06 ( -8.30806e-08  8.31488e-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)  = 5.42e-06
S(50-100 keV) = 5.06e-06

T90 vs. Hardness ratio plot

T90                                   = 59.9839999675751 sec.
Hardness ratio (energy fluence ratio) = 0.933579

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.04239
Count Ratio (50-100 keV) / (15-25 keV) = 0.534657

Mask shadow pattern

IMX = -3.501517289823179E-01, IMY = 3.904046968426518E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

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:
-239.864000 -0.732000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4659  35.2841   10.6  27.2   61.8   0.3412   1.1    3.5	Her X-1                       
299.5775  35.2117    3.2  50.9   15.1   2.2155   3.6    0.9	Cyg X-1                       
308.1563  41.0460    9.7  51.3    3.7   0.6557   1.2    6.0	Cyg X-3                       
345.5676  58.7718    3.1  54.4  -33.1   4.7228   3.7 ------	UNKNOWN

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

Time interval of the image:
-0.732000 10.636590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4576  35.1952   15.9  27.3   62.0  -0.0516  -0.7    8.8	Her X-1                       
299.3659  35.1754   23.7  50.8   15.3   0.0826   0.5   11.1	Cyg X-1                       
308.1655  41.0402   10.1  51.3    3.7  -0.1704  -1.2    5.8	Cyg X-3                       
225.1484  21.3604    4.1  35.0  118.3   0.3105   2.9 ------	UNKNOWN                       
179.8855  18.6741    2.8  52.4  176.8   0.7232   4.1 ------	UNKNOWN                       
176.6359  58.1850    0.2  27.7 -131.9   4.0132  52.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
59.036610 305.036600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
209.8364  36.2615    2.6  30.8   92.1   1.7106   4.4 ------	UNKNOWN                       
174.4737   5.8048    3.1  52.4  154.2   4.4689   3.8 ------	UNKNOWN                       
176.5161  58.1907    0.9   0.1  -97.1   2.8264  12.7 ------	UNKNOWN                       
161.3292  53.6801    2.7   9.7 -139.5   0.9887   4.2 ------	UNKNOWN                       
144.7173  17.7351    3.0  46.8 -164.7   2.0999   3.9 ------	UNKNOWN                       
134.5342  20.5968    3.0  48.3 -151.3   2.7289   3.8 ------	UNKNOWN                       
122.2743  29.0791    3.3  47.1 -132.4   3.7754   3.5 ------	UNKNOWN

Plot creation:
Wed Jul  1 20:09:15 EDT 2020