batgrbproduct analysis for trigger=1037828

batgrbproduct Analysis for Trigger=1037828

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): Fri Nov 11 22:19:55 EST 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1037828
======================================================================

  Trigger: 01037828      Segment: 000

  BAT Trigger Time: 638003657.728   [s; MET]
      Trigger Stop: 638003659.776   [s; MET]
               UTC: 2021-03-21T07:13:51.023260    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 87.8737930674534   Dec: 70.119331009023  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.4
     Image Trigger?:     NO
     Rate S/N Ratio:     15.8113883008419  [ if not an image trigger ]
     Image S/N Ratio:    7.4

  Flight Position:   [ source = BAT ]
    RA: 87.8737930674534   Dec: 70.119331009023  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 87.887028989403   Dec: 70.1093007653767  [deg; J2000]  
        { 05h 51m 32.9s , +70d 06' 33.5" }
         +/- 1.60469574438332 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.565585095547763 [arcmin] (formal 1-sigma fit error)
    SNR: 15.4774794435645
 
  Angular difference between Flight and Ground position is 0.659659 arcmin
 
  Partial Coding Fraction: 0.3046875    [ including projection effects ]

  Duration
     T90: 8.21200001239777 +/- 0.503968260000279
        Measured from: -6.74400007724762
                   to: 1.46799993515015     [s; relative to TRIGTIME]
     T50: 5.30399990081787 +/- 1.16413742646997
        Measured from: -5.25999999046326
                   to: 0.0439999103546143     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -6.99200010299683     
                   to: -5.99200010299683     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -7     
                   to: 1.83599996566772     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.507032   0.490557   0.197149   0.072296
           0.042085   0.043918   0.037830   0.032367 [error]
 Peak      0.076752   0.066342   0.057940   0.019342
           0.013881   0.015303   0.013668   0.011385 [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 1.70e-07 2.09e-07 1.87e-07 2.92e-07 6.66e-07 8.57e-07   erg/cm2
              Error 2.31e-08 2.16e-08 3.57e-08 1.07e-07 8.17e-08 1.50e-07   erg/cm2
Peak flux Power-law 7.57e-01 5.76e-01 2.93e-01 2.14e-01 1.73e+00 1.84e+00   ph/cm2/s
              Error 2.26e-01 1.23e-01 1.11e-01 1.56e-01 3.64e-01 4.00e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.68e-07 2.15e-07 1.83e-07 1.74e-07 6.48e-07 7.45e-07   erg/cm2
              Error 2.08e-08 2.80e-08 4.64e-08 2.09e-07 1.04e-07 2.64e-07   erg/cm2
Peak flux Cutoff-PL 7.60e-01 5.62e-01 2.89e-01 2.45e-01 1.71e+00 1.83e+00   ph/cm2/s
              Error 2.47e-01 1.55e-01 8.59e-02 8.82e-02 4.85e-01 5.27e-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    2.157    0.199    -      -           8.07e-03 1.11e-03   64.200 57
CPL   2.154    0.490    9999.3    0.0      8.08e-03 0.00e+00   64.200 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.975    0.428    -      -           1.16e-02 3.32e-03   60.810 57
CPL   2.045    0.796      22.2 -4998.6      1.03e-02 2.08e-02   60.690 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    8.836   -7.000    1.836
T90     8.212   -6.744    1.468
T50     5.304   -5.260    0.044
Peak    1.000   -6.992   -5.992

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
   87.8870    70.1093   0.0124    35.0397  -109.5671         1.2893336     15.477 TRIG_01037828                 
 
Foreground time interval of the image:
 -7.000   1.836 (delta_t =   8.836 [sec])
Background time interval of the image:
-239.728  -7.000 (delta_t = 232.728 [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   -7.000 sec. to    1.836 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.15708     ( -0.192862   0.204151 )
Norm@50keV  : 8.06551E-03    ( -0.00112619   0.00110155 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.20     using 59 bins.
 Reduced chi-squared = 1.12632
# Null hypothesis probability of 2.39e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 8.836 sec: 1.30598 ( -0.13084  0.13086 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.66416e-07 ( -8.08237e-08  8.26248e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -7.000 sec. to    1.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.15433     ( -0.772193   0.208426 )
Epeak [keV] : 9999.33      (   )
Norm@50keV  : 8.08362E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.20     using 59 bins.
 Reduced chi-squared = 1.14643
# Null hypothesis probability of 2.11e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 8.836 sec: 1.30554 ( -0.13059  0.13064 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.47673e-07 ( -1.12313e-07  9.52706e-08 ) ergs/cm2

Band function

Time interval is from   -7.000 sec. to    1.836 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]    : 8.18831  (-0.918191  1.03569)
R^2/D10^2   : 1.30037  (-0.494178   0.801996)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   78.92     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.89e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.417e-07   2.607e-08
25- 50  2.581e-07   4.025e-08
50-150  7.311e-08   2.510e-08
15-150  4.728e-07   6.088e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 47.6277       (-11.9845      18.9141)
Norm        : 7.58396       (-1.32895     1.74251)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.80     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.23e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.619e-07   2.147e-08
25- 50  2.285e-07   2.801e-08
50-150  2.118e-07   6.344e-08
15-150  6.022e-07   8.341e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.09366        (-1.18152      1.07523)
R1^2/D10^2  : 2.14786        (-0.540083      2.03469)
kT2 [keV]   : 70.1978        (-47.3924      -70.673)
R2^2/D10^2  : 5.86223E-04    (-0.000507728   0.00731604)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.26     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.23e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.576e-07   3.375e-08
25- 50  2.348e-07   4.953e-08
50-150  3.006e-07   1.557e-07
15-150  6.931e-07   1.992e-07

Peak spectrum fit

Power-law model

Time interval is from   -6.992 sec. to   -5.992 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97529     ( -0.400599   0.455379 )
Norm@50keV  : 1.16335E-02    ( -0.00343291   0.00320998 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.81     using 59 bins.
 Reduced chi-squared = 1.06684
# Null hypothesis probability of 3.40e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.72562 ( -0.36442  0.36441 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07177e-07 ( -2.85612e-08  2.97377e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -6.992 sec. to   -5.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.04459     ( -0.417496   1.17542 )
Epeak [keV] : 22.2293      ( -2.06256 -9999.35 )
Norm@50keV  : 1.03364E-02    ( -0.00355678   0.0381089 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.69     using 59 bins.
 Reduced chi-squared = 1.08375
# Null hypothesis probability of 3.11e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.70572 ( -0.58403  0.38548 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Band function

Time interval is from   -6.992 sec. to   -5.992 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]    : 7.25620  (-1.83554  3.17742)
R^2/D10^2   : 2.66849  (-2.00577   6.02101)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.73     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.20e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.339e-08   1.222e-08
25- 50  3.431e-08   1.560e-08
50-150  6.465e-09   4.854e-09
15-150  6.417e-08   3.211e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 71.1877       (-38.0359      -71.2391)
Norm        : 8.38881       (-2.50827     4.33938)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.31     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.93e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.156e-08   7.205e-09
25- 50  3.446e-08   1.365e-08
50-150  4.481e-08   3.425e-08
15-150  1.008e-07   5.016e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.37757        (-1.51384      2.01272)
R1^2/D10^2  : 7.56460        (-5.36617      10.7059)
kT2 [keV]   : 30.0524        (-14.0196      -30.0555)
R2^2/D10^2  : 1.07734E-02    (-0.0105454   0.0820437)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.47     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.49e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.592e-08   1.508e-08
25- 50  2.838e-08   1.583e-08
50-150  6.093e-08   4.024e-08
15-150  1.152e-07   6.050e-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: 2.15708     ( -0.192862   0.204151 )
Norm@50keV  : 8.06551E-03    ( -0.00112619   0.00110155 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.20     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.39e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 8.836 sec: 1.30586 ( -0.130826  0.130842 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.66292e-07 ( -8.07976e-08  8.26269e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97771     (     )
Epeak [keV] : 4.69671      (   )
Norm@50keV  : 1.04187E-02    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.03     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.16e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 8.836 sec: 1.29524 ( -0.13811  0.13656 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.46591e-07 ( -1.11143e-07  9.89906e-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)  = 2.09e-07
S(50-100 keV) = 1.87e-07

T90 vs. Hardness ratio plot

T90                                   = 8.21200001239777 sec.
Hardness ratio (energy fluence ratio) = 0.894737

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.967507
Count Ratio (50-100 keV) / (15-25 keV) = 0.38883

Mask shadow pattern

IMX = -2.348523842962926E-01, IMY = 6.607430845806622E-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:
-239.728000 -7.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
230.5111  28.9278    3.2  55.9   10.8   6.2029   3.6 ------	UNKNOWN                       
245.9069  39.4030    3.3  57.3   -8.9   4.5404   3.5 ------	UNKNOWN                       
249.8232  63.7972    2.4  43.9  -35.7   2.6950   4.7 ------	UNKNOWN                       
253.7292  77.1714    2.8  39.2  -54.8   2.2426   4.2 ------	UNKNOWN

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

Time interval of the image:
-7.000000 1.836000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
132.7744  51.9367    2.5  16.3 -159.8   0.1816   4.5 ------	UNKNOWN                       
 87.8870  70.1093    0.7  35.0 -109.6   1.2891  15.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

Plot creation:
Fri Nov 11 22:28:10 EST 2022