GRB210321A

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: 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

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

  Refined 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 the analysis and refined 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 ] 

======================================================================
 
 
====== 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
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -2.157    -0.204      0.193       -           -               -         8.07e-03     -1.13e-03          1.10e-03      64.200   57
CPL     -2.154    -0.209      0.772     9999.330      N/A           N/A         8.08e-03        N/A               N/A         64.200   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.975     -0.455     0.401       -           -               -         1.16e-02     -3.43e-03          3.21e-03      60.810   57
CPL     -1.991     -1.175     0.418     9999.270      -1.980      -9999.270      1.15e-02     -4.75e-03          3.69e-02      60.820   56
 
 
=== 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         PL   1.69e-07  2.09e-07  1.87e-07  2.91e-07  6.66e-07  8.57e-07   erg/cm2
      90%_error_low -2.29e-08 -2.16e-08 -3.51e-08 -9.39e-08 -8.08e-08 -1.40e-07   erg/cm2
      90%_error_hi   2.33e-08  2.15e-08  3.63e-08  1.21e-07  8.26e-08  1.60e-07   erg/cm2
Peak flux       PL   7.57e-01  5.76e-01  2.93e-01  2.14e-01  1.73e+00  1.84e+00   ph/cm2/s
      90%_error_low -2.22e-01 -1.23e-01 -1.09e-01 -1.22e-01 -3.64e-01 -3.99e-01   ph/cm2/s
      90%_error_hi   2.30e-01  1.23e-01  1.12e-01  1.91e-01  3.64e-01  4.02e-01   ph/cm2/s
 
Fluence        CPL   1.68e-07  2.14e-07  1.83e-07  1.74e-07  6.48e-07  7.45e-07   erg/cm2
      90%_error_low -2.10e-08 -2.21e-08 -5.29e-08 -1.50e-07 -1.12e-07 -2.03e-07   erg/cm2
      90%_error_hi   2.07e-08  3.40e-08  4.00e-08  2.68e-07  9.53e-08  3.25e-07   erg/cm2
Peak flux      CPL   7.60e-01  5.62e-01  2.89e-01  2.45e-01  1.71e+00  1.83e+00   ph/cm2/s
      90%_error_low -2.65e-01 -1.80e-01 -1.06e-01 -1.25e-01 -5.84e-01 -6.32e-01   ph/cm2/s
      90%_error_hi   2.29e-01  1.30e-01  6.61e-02  5.15e-02  3.85e-01  4.23e-01   ph/cm2/s
 
======================================================================

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])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Bokeh Plot

Other quick-look light curves:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

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     ( -0.204151   0.192862 )
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     ( -0.208426   0.772193 )
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

1-s 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     ( -0.455379   0.400599 )
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     ( -1.17542   0.417496 )
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

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

IMX = -2.348523842962926E-01, IMY = 6.607430845806622E-01

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:

Analysis Summary

Notes:

Image

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

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

S(15-50 keV) vs. S(50-150 keV) plot

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve