batgrbproduct analysis for trigger=993768

batgrbproduct Analysis for Trigger=993768

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 v2.48
    Process Start Time (local time): Sun Nov 15 19:41:01 EST 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger993768
======================================================================

  Trigger: 00993768      Segment: 000

  BAT Trigger Time: 620402400   [s; MET]
      Trigger Stop: 620402464   [s; MET]
               UTC: 2020-08-29T13:59:34.457300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 251.212254438923   Dec: 72.3352684295848  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.74
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    11.74

  Flight Position:   [ source = BAT ]
    RA: 251.212254438923   Dec: 72.3352684295848  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 251.139284908903   Dec: 72.3639616106839  [deg; J2000]  
        { 16h 44m 33.4s , +72d 21' 50.3" }
         +/- 1.82120547775213 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.976871840948292 [arcmin] (formal 1-sigma fit error)
    SNR: 12.9174570394513
 
  Angular difference between Flight and Ground position is 2.173964 arcmin
 
  Partial Coding Fraction: 0.8828125    [ including projection effects ]

  Duration
     T90: 13.0999999046326 +/- 3.07955838522709
        Measured from: -62.6679999828339
                   to: -49.5680000782013     [s; relative to TRIGTIME]
     T50: 2.6839998960495 +/- 0.0488262872311079
        Measured from: -60.5199999809265
                   to: -57.836000084877     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -60.067999958992     
                   to: -59.067999958992     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -74.7680000066757     
                   to: 204.075999975204     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    11.180540  20.311526  24.369469  10.130800
           0.142404   0.165589   0.171676   0.155379 [error]
 Peak      1.607454   3.645324   5.388016   2.427071
           0.033399   0.049304   0.061176   0.049976 [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 3.79e-06 9.31e-06 1.83e-05 8.89e-05 4.93e-05 1.20e-04   erg/cm2
              Error 1.21e-07 1.79e-07 2.33e-07 2.70e-06 6.24e-07 2.71e-06   erg/cm2
Peak flux Power-law 3.06e-03 4.14e-02 7.55e-01 8.27e+01 3.41e+00 8.05e+01   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 3.62e-06 9.28e-06 1.85e-05 8.03e-05 4.93e-05 1.12e-04   erg/cm2
              Error 1.78e-07 1.81e-07 3.15e-07 7.95e-06 6.28e-07 7.91e-06   erg/cm2
Peak flux Cutoff-PL 1.57e+01 2.83e+01 3.52e+01 5.56e+01 1.01e+02 1.35e+02   ph/cm2/s
              Error 9.71e-01 7.05e-01 7.94e-01 5.13e+00 1.80e+00 5.47e+00   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    1.025    0.024    -      -           1.65e-02 2.39e-04   21.290 57
CPL   0.919    0.076     694.2 3768.6      1.81e-02 1.47e-03   18.080 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.771    0.029    -      -           8.85e-01 1.59e-02   64.020 57
CPL   0.368    0.128     270.8   69.7      1.26e+00 1.37e-01   33.130 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: 7.488000 sec.
T50 in the 50-300 keV band: 2.368000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  278.844  -74.768  204.076
T90    13.100  -62.668  -49.568
T50     2.684  -60.520  -57.836
Peak    1.000  -60.068  -59.068

Click here for the BAT GCN circular template

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

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
  251.1393    72.3640   0.0149    22.7217   -33.4050         1.8650209     12.917 TRIG_00993768                 
 
Foreground time interval of the image:
-12.099  72.501 (delta_t =  84.600 [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 64.000000

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 64.000000

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 64.000000

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  -74.768 sec. to  204.076 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02508     ( -0.0240847   0.0239666 )
Norm@50keV  : 1.65253E-02    ( -0.000239245   0.000238608 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   21.29     using 59 bins.
 Reduced chi-squared = 0.373509
# Null hypothesis probability of 1.00e+00 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 278.8 sec: 1.90532 ( -0.02906  0.02913 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.93905e-05 ( -6.23901e-07  6.236e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -74.768 sec. to  204.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.919370     ( -0.10226   0.0506214 )
Epeak [keV] : 694.212      ( -303.848 7233.44 )
Norm@50keV  : 1.80739E-02    ( -0.00134685   0.00160187 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   18.08     using 59 bins.
 Reduced chi-squared = 0.322857
# Null hypothesis probability of 1.00e+00 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 278.8 sec: 0.316846 ( -0.043777  0.032488 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.93245e-05 ( -6.28518e-07  6.27529e-07 ) ergs/cm2

Band function

Time interval is from  -74.768 sec. to  204.076 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]    : 26.1109  (  )
R^2/D10^2   : 3.95722E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  903.68     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.12e-152 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.276e-06   3.541e-08
25- 50  7.399e-06   1.589e-07
50-150  3.713e-05   5.715e-07
15-150  4.580e-05   5.994e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 8.69962       (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                 1685.85     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.34e-315 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.040e-06   9.061e-08
25- 50  1.162e-05   1.687e-07
50-150  2.548e-05   3.917e-07
15-150  4.314e-05   6.134e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.72981        (-0.663534      0.704938)
R1^2/D10^2  : 0.473009        (-0.0892799      0.116284)
kT2 [keV]   : 40.1191        (-2.23406      2.73925)
R2^2/D10^2  : 8.97013E-03    (-0.00167732   0.00180973)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   37.56     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.65e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.036e-06   1.756e-07
25- 50  9.556e-06   2.579e-07
50-150  3.685e-05   8.225e-07
15-150  4.944e-05   1.101e-06

Peak spectrum fit

Power-law model

Time interval is from  -60.068 sec. to  -59.068 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.770524     ( -0.0289792   0.0288229 )
Norm@50keV  : 0.884779    ( -0.0158786   0.0158357 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.02     using 59 bins.
 Reduced chi-squared = 1.12316
# Null hypothesis probability of 2.44e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.41045 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04708e-05 ( -1.75713e-07  1.75777e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -60.068 sec. to  -59.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.368350     ( -0.129726   0.12634 )
Epeak [keV] : 270.821      ( -49.1883 90.1713 )
Norm@50keV  : 1.25758    ( -0.128667   0.146315 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   33.13     using 59 bins.
 Reduced chi-squared = 0.591607
# Null hypothesis probability of 9.94e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 100.512 ( -1.7938  1.799 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.04674e-05 ( -1.77764e-07  1.77951e-07 ) ergs/cm2

Band function

Time interval is from  -60.068 sec. to  -59.068 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]    : 28.2542  (  )
R^2/D10^2   : 1.87388  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  370.52     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.65e-47 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.426e-07   7.650e-09
25- 50  1.459e-06   3.700e-08
50-150  8.401e-06   1.710e-07
15-150  1.010e-05   1.790e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 413.767       (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                 2042.23     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 0.00e+00 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.030e-06   1.850e-08
25- 50  1.982e-06   3.750e-08
50-150  4.347e-06   7.850e-08
15-150  7.359e-06   1.425e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 10.3169        (-1.10832      1.2307)
R1^2/D10^2  : 15.5166        (-3.90051      5.74396)
kT2 [keV]   : 40.5931        (-2.76673      3.70056)
R2^2/D10^2  : 0.563103    (-0.133508   0.140789)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   32.90     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.92e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.582e-07   3.415e-08
25- 50  1.694e-06   9.050e-08
50-150  8.402e-06   2.925e-07
15-150  1.055e-05   3.300e-07

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: 2.46074     ( -0.236408   0.258517 )
Norm@50keV  : 9.61043E-04    ( -0.000178894   0.000178032 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.17     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.91e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 84.6 sec: 0.184345 ( -0.0195596  0.0195619 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.04731e-07 ( -1.09813e-07  1.14696e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.92853     (     )
Epeak [keV] : 4.85951      (   )
Norm@50keV  : 2.07585E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.32     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.89e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 84.6 sec: 0.181334 ( -0.020043  0.020118 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.63869e-07 ( -1.18853e-07  1.3537e-07 ) 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)  = 9.31e-06
S(50-100 keV) = 1.83e-05

T90 vs. Hardness ratio plot

T90                                   = 13.0999999046326 sec.
Hardness ratio (energy fluence ratio) = 1.96563

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.81669
Count Ratio (50-100 keV) / (15-25 keV) = 2.17963

Mask shadow pattern

IMX = 3.495756185963115E-01, IMY = 2.305463279172886E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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:
-12.099400 72.500600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6293  35.2697    4.4  21.0 -150.9   0.3565   2.6    9.5	Her X-1                       
268.3256  -1.3882    4.9  53.2  169.2  -1.3108  -2.4    4.6	SW J1753.5-0127               
288.8475  10.9404    6.8  42.8  140.1  -0.6521  -1.7    2.9	GRS 1915+105                  
299.6075  35.1847    2.6  25.2  104.0   0.8218   4.5    1.3	Cyg X-1                       
308.1355  40.9731    3.6  26.3   83.7   0.6096   3.2    1.7	Cyg X-3                       
326.1318  38.4348   13.8  38.9   72.0  -0.3934  -0.8    7.0	Cyg X-2                       
251.1394  72.3639    0.9  22.7  -33.4   1.8640  12.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
117.300590 963.094800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5869  35.3285    7.0  37.1  170.2  -1.9063  -1.6    6.4	Her X-1                       
301.3835  54.9474    3.1  26.9   97.8   3.8536   3.8 ------	UNKNOWN                       
251.2052  72.3353    1.7   0.0 -110.7   4.8972   6.9 ------	UNKNOWN                       
100.8998  69.3454    3.0  37.0  -22.1   3.7645   3.9 ------	UNKNOWN

Plot creation:
Sun Nov 15 21:50:34 EST 2020