batgrbproduct analysis for trigger=980421

batgrbproduct Analysis for Trigger=980421

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): Wed Jul 22 21:56:44 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger980421
======================================================================

  Trigger: 00980421      Segment: 000

  BAT Trigger Time: 615300444.288   [s; MET]
      Trigger Stop: 615300446.336   [s; MET]
               UTC: 2020-07-01T12:46:59.079040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 123.554730695954   Dec: -14.4938413543113  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.22
     Image Trigger?:     NO
     Rate S/N Ratio:     9  [ if not an image trigger ]
     Image S/N Ratio:    7.22

  Flight Position:   [ source = BAT ]
    RA: 123.554730695954   Dec: -14.4938413543113  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 123.566684878342   Dec: -14.5336398394491  [deg; J2000]  
        { 08h 14m 16.0s , -14d 32' 01.1" }
         +/- 1.5225831988995 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.703721835831624 [arcmin] (formal 1-sigma fit error)
    SNR: 16.6835448249642
 
  Angular difference between Flight and Ground position is 2.486815 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 38.7799999713898 +/- 8.71284933029988
        Measured from: -5.12000000476837
                   to: 33.6599999666214     [s; relative to TRIGTIME]
     T50: 14.2719999551773 +/- 4.4944823660938
        Measured from: 0.00800001621246338
                   to: 14.2799999713898     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -1.72000002861023     
                   to: -0.720000028610229     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.80799996852875     
                   to: 42.1679999828339     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.635745   0.723826   0.320723   0.084487
           0.052164   0.053219   0.045229   0.039122 [error]
 Peak      0.029909   0.038926   0.017303   0.018803
           0.007807   0.007707   0.006855   0.005735 [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 1.94e-07 2.74e-07 2.86e-07 5.49e-07 9.26e-07 1.30e-06   erg/cm2
              Error 2.44e-08 2.42e-08 4.32e-08 1.64e-07 9.95e-08 2.11e-07   erg/cm2
Peak flux Power-law 2.69e-01 2.47e-01 1.58e-01 1.54e-01 7.38e-01 8.28e-01   ph/cm2/s
              Error 1.01e-01 6.05e-02 5.51e-02 1.10e-01 1.79e-01 2.07e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.90e-07 2.88e-07 2.76e-07 2.41e-07 8.77e-07 9.94e-07   erg/cm2
              Error 2.60e-08 3.38e-08 5.21e-08 2.85e-07 1.25e-07 3.40e-07   erg/cm2
Peak flux Cutoff-PL 2.73e-01 2.45e-01 1.57e-01 1.55e-01 7.38e-01 8.19e-01   ph/cm2/s
              Error 1.01e-01 6.50e-02 5.52e-02 8.01e-02 1.79e-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    1.938    0.165    -      -           2.06e-03 2.26e-04    0.000  0
CPL   1.519    0.739      45.7    0.0      3.66e-03 0.00e+00    0.000  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.652    0.439    -      -           5.65e-03 1.53e-03    0.000  0
CPL   1.651    0.000    9999.2    0.0      5.66e-03 0.00e+00    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: 16.960000 sec.
T50 in the 50-300 keV band: 8.064000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   48.976   -6.808   42.168
T90    38.780   -5.120   33.660
T50    14.272    0.008   14.280
Peak    1.000   -1.720   -0.720

Click here for the BAT GCN circular template

Special notes of this burst

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
  123.5667   -14.5336   0.0116    19.5769   -65.1888         1.7623687     16.684 TRIG_00980421                 
 
Foreground time interval of the image:
 -6.808  42.168 (delta_t =  48.976 [sec])
Background time interval of the image:
-239.288  -6.808 (delta_t = 232.480 [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 2.048000

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 2.048000

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 2.048000

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   -6.808 sec. to   42.168 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.93816     ( -0.162118   0.168107 )
Norm@50keV  : 2.05555E-03    ( -0.000228242   0.000224231 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.11     using 59 bins.
 Reduced chi-squared = 1.13746
# Null hypothesis probability of 1.69e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 48.98 sec: 0.299908 ( -0.026494  0.026498 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.26403e-07 ( -9.85203e-08  1.00499e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -6.808 sec. to   42.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.51930     ( -0.833739   0.644622 )
Epeak [keV] : 45.7428      (   )
Norm@50keV  : 3.65961E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.11     using 59 bins.
 Reduced chi-squared = 1.13746
# Null hypothesis probability of 1.69e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 48.98 sec: 0.295118 ( -0.027622  0.027512 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.76757e-07 ( -1.24322e-07  1.26053e-07 ) ergs/cm2

Band function

Time interval is from   -6.808 sec. to   42.168 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]    : 9.01359  (-0.871394  0.998616)
R^2/D10^2   : 0.208405  (-0.070294   0.102124)
(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  1.616e-07   2.233e-08
25- 50  3.443e-07   3.703e-08
50-150  1.319e-07   3.664e-08
15-150  6.378e-07   7.298e-08

Thermal bremsstrahlung (OTTB)

XSPEC12>/*
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 69.0787       (-17.8048      28.3646)
Norm        : 1.48335       (-0.207027     0.237931)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.861e-07   2.317e-08
25- 50  2.951e-07   2.860e-08
50-150  3.753e-07   9.372e-08
15-150  8.565e-07   1.134e-07

Double BB

XSPEC12>/*
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.10677        (-0.989109      1.03007)
R1^2/D10^2  : 0.444721        (-0.172833      0.312554)
kT2 [keV]   : 34.4223        (-12.3855      44.3821)
R2^2/D10^2  : 9.58236E-04    (-0.000839888   0.00334411)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.875e-07   3.879e-08
25- 50  3.048e-07   7.536e-08
50-150  4.497e-07   2.322e-07
15-150  9.420e-07   3.076e-07

Peak spectrum fit

Power-law model

Time interval is from   -1.720 sec. to   -0.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65155     ( -0.434506   0.443277 )
Norm@50keV  : 5.64772E-03    ( -0.00155838   0.00150348 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.29     using 59 bins.
 Reduced chi-squared = 0.971017
# Null hypothesis probability of 4.64e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.737859 ( -0.178583  0.178649 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.25255e-08 ( -1.49184e-08  1.56048e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.720 sec. to   -0.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65122     (     )
Epeak [keV] : 9999.25      (   )
Norm@50keV  : 5.65708E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.29     using 59 bins.
 Reduced chi-squared = 0.971017
# Null hypothesis probability of 4.64e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.737533 ( -0.178277  0.178915 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.28689e-08 ( -3.09318e-08  1.12609e-08 ) ergs/cm2

Band function

Time interval is from   -1.720 sec. to   -0.720 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]    : 8.56852  (-1.78692  2.72568)
R^2/D10^2   : 0.638045  (-0.421597   0.951547)
(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  8.872e-09   4.839e-09
25- 50  1.743e-08   7.772e-09
50-150  5.709e-09   3.872e-09
15-150  3.201e-08   1.654e-08

Thermal bremsstrahlung (OTTB)

XSPEC12>/*
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 133.707       (-86.6135      -132.752)
Norm        : 3.09039       (-0.818796     1.42184)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.005e-09   4.606e-09
25- 50  1.458e-08   8.450e-09
50-150  2.738e-08   1.794e-08
15-150  4.997e-08   3.142e-08

Double BB

XSPEC12>/*
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.54864        (-1.54937      1.90662)
R1^2/D10^2  : 0.947296        (-0.286615      1.41836)
kT2 [keV]   : 199.362        (-199.363      -199.363)
R2^2/D10^2  : 1.08745E-04    (-5.95539e-05   0.00305229)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.455e-09   5.625e-09
25- 50  1.589e-08   9.405e-09
50-150  3.197e-08   7.310e-09
15-150  5.731e-08   2.363e-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: 1.93816     ( -0.162118   0.168107 )
Norm@50keV  : 2.05555E-03    ( -0.000228242   0.000224231 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 48.98 sec: 0.299891 ( -0.0264952  0.0264927 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.26226e-07 ( -9.86305e-08  1.00539e-07 ) ergs/cm2

Cutoff power-law model

 XSPEC: quit
 
 
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.51842     ( -0.833436   0.644927 )
Epeak [keV] : 45.7186      (   )
Norm@50keV  : 3.66437E-03    (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 48.98 sec: 0.295053 ( -0.027612  0.027502 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.76958e-07 ( -1.24321e-07  1.26182e-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)  = 2.74e-07
S(50-100 keV) = 2.86e-07

T90 vs. Hardness ratio plot

T90                                   = 38.7799999713898 sec.
Hardness ratio (energy fluence ratio) = 1.0438

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.13855
Count Ratio (50-100 keV) / (15-25 keV) = 0.504484

Mask shadow pattern

IMX = 1.492325795130763E-01, IMY = 3.228025150966413E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

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:
-239.288000 -6.808000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5332 -40.5224    1.7  12.0   58.5   1.6769   6.7    2.0	Vela X-1                      
170.3772 -60.5624    3.6  40.3   78.3  -3.0512  -3.1    4.1	Cen X-3                       
 50.0305 -39.5708    2.2  56.9  174.0   6.8091   5.2 ------	UNKNOWN                       
114.6271  -2.1311    2.1  32.9  -82.6   2.6502   5.4 ------	UNKNOWN                       
103.1459   2.2681    2.5  40.8  -98.4   5.0658   4.6 ------	UNKNOWN

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

Time interval of the image:
-6.808000 42.168000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5135 -40.7351    7.0  12.1   59.4   0.1553   1.6   10.8	Vela X-1                      
170.5818 -60.6611    5.7  40.4   78.4  -0.8609  -2.0    8.2	Cen X-3                       
 49.0126 -51.9635    3.0  54.2  159.2   2.0074   3.9 ------	UNKNOWN                       
103.8431 -23.1050    2.7  19.9 -128.9   0.4489   4.3 ------	UNKNOWN                       
123.5667 -14.5336    0.7  19.6  -65.2   1.7622  16.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
590.112600 653.006800
660.712000 717.566700
720.712000 775.392000
780.712000 962.794100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5293 -40.5619    1.9  41.9  -36.9   3.6957   6.1    0.4	Vela X-1                      
170.4810 -60.7565   11.9  34.9   10.0  -0.4746  -1.0    9.4	Cen X-3                       
186.3904 -62.6854   12.1  37.2   22.6  -0.5449  -1.0    8.9	GX 301-2                      
216.6249 -58.3041    3.5  46.9   40.5   3.4598   3.3 ------	UNKNOWN                       
157.7845 -47.6645    2.9  42.5  -10.8   2.0729   4.0 ------	UNKNOWN                       
113.4718 -49.5520    2.6  27.4  -55.7   2.0462   4.4 ------	UNKNOWN                       
109.3178 -47.6921    2.3  28.1  -62.7   2.4819   5.0 ------	UNKNOWN

Plot creation:
Wed Jul 22 22:09:59 EDT 2020