GRB220319A: Summary Image Light curves Spectra Distribution Others

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: Sun Oct 23 23:35:33 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1098132
======================================================================

  Trigger: 01098132      Segment: 000

  BAT Trigger Time: 669404462.144   [s; MET]
      Trigger Stop: 669404463.168   [s; MET]
               UTC: 2022-03-19T17:40:33.333640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 218.207242690197   Dec: 61.2888027725665  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.27
     Image Trigger?:     NO
     Rate S/N Ratio:     15.556349186104  [ if not an image trigger ]
     Image S/N Ratio:    7.27

  Analysis Position:   [ source = BAT ]
    RA: 218.207242690197   Dec: 61.2888027725665  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 218.140183106739   Dec: 61.2893190597773  [deg; J2000]  
        { 14h 32m 33.6s , +61d 17' 21.5" }
         +/- 1.89777145799767 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.897821586871077 [arcmin] (formal 1-sigma fit error)
    SNR: 12.1794332344774
 
  Angular difference between the analysis and refined position is 1.933137 arcmin
 
  Partial Coding Fraction: 0.4375    [ including projection effects ]

  Duration
     T90: 6.41999995708466 +/- 1.37503449978636
        Measured from: -0.216000080108643
                   to: 6.20399987697601     [s; relative to TRIGTIME]
     T50: 2.68799996376038 +/- 0.806367047513266
        Measured from: 0.303999900817871
                   to: 2.99199986457825     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.236000061035156     
                   to: 0.763999938964844     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.364000082015991     
                   to: 6.56399989128113     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.189527   0.179525   0.075295   0.047042
           0.022782   0.022852   0.019412   0.015633 [error]
 Peak      0.041942   0.081822   0.053354   0.010549
           0.009299   0.009580   0.008140   0.005884 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    6.928   -0.364    6.564
T90     6.420   -0.216    6.204
T50     2.688    0.304    2.992
Peak    1.000   -0.236    0.764
 
 
====== 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      -2.154    -0.299      0.272       -           -               -         3.61e-03     -7.32e-04          7.07e-04      42.880   57
CPL     -1.977     N/A        N/A           5.283      N/A           N/A         4.60e-03        N/A               N/A         42.860   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      -1.589     -0.226     0.221       -           -               -         1.18e-02     -1.78e-03          1.76e-03      56.580   57
CPL      0.137     -1.153     1.495       60.020     -10.698        27.872      9.28e-02     -9.28e-02          4.27e-01      49.480   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   5.91e-08  7.32e-08  6.58e-08  1.03e-07  2.33e-07  3.01e-07   erg/cm2
      90%_error_low -1.11e-08 -1.08e-08 -1.77e-08 -4.52e-08 -4.06e-08 -6.93e-08   erg/cm2
      90%_error_hi   1.13e-08  1.07e-08  1.85e-08  6.43e-08  4.19e-08  8.39e-08   erg/cm2
Peak flux       PL   5.29e-01  5.05e-01  3.36e-01  3.48e-01  1.51e+00  1.72e+00   ph/cm2/s
      90%_error_low -1.17e-01 -7.68e-02 -6.12e-02 -1.08e-01 -2.23e-01 -2.51e-01   ph/cm2/s
      90%_error_hi   1.23e-01  7.63e-02  6.07e-02  1.32e-01  2.24e-01  2.51e-01   ph/cm2/s
 
Fluence        CPL   5.90e-08  7.42e-08  6.50e-08  7.06e-08  2.29e-07  2.67e-07   erg/cm2
      90%_error_low -1.21e-08 -1.00e-08 -2.01e-08 -4.91e-08 -4.36e-08 -8.41e-08   erg/cm2
      90%_error_hi   1.15e-08  1.10e-08  1.88e-08  1.09e-07  4.64e-08  1.67e-07   erg/cm2
Peak flux      CPL   4.02e-01  6.01e-01  3.80e-01  8.41e-02  1.45e+00  1.47e+00   ph/cm2/s
      90%_error_low -1.40e-01 -1.01e-01 -7.78e-02 -5.44e-02 -2.28e-01 -2.36e-01   ph/cm2/s
      90%_error_hi   1.48e-01  1.05e-01  7.86e-02  1.21e-01  2.29e-01  2.45e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  218.1402    61.2893   0.0157    29.5707  -105.4347         0.5277579     12.179 TRIG_01098132                 
 
Foreground time interval of the image:
 -0.364   6.564 (delta_t =   6.928 [sec])
Background time interval of the image:
-239.144  -0.364 (delta_t = 238.780 [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

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   -0.364 sec. to    6.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.15355     ( -0.299411   0.271917 )
Norm@50keV  : 3.60513E-03    ( -0.000732104   0.000707162 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   42.88     using 59 bins.
 Reduced chi-squared = 0.752281
# Null hypothesis probability of 9.17e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 6.928 sec: 0.582696 ( -0.081823  0.081824 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.33458e-07 ( -4.05907e-08  4.19258e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.364 sec. to    6.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.97658     (       )
Epeak [keV] : 5.28272      (   )
Norm@50keV  : 4.60262E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   42.86     using 59 bins.
 Reduced chi-squared = 0.765357
# Null hypothesis probability of 9.02e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 6.928 sec: 0.582011 ( -0.081464  0.083493 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.29186e-07 ( -4.36329e-08  4.6445e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.236 sec. to    0.764 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.58891     ( -0.225704   0.220829 )
Norm@50keV  : 1.18096E-02    ( -0.00177554   0.00176377 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.58     using 59 bins.
 Reduced chi-squared = 0.992632
# Null hypothesis probability of 4.91e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.51247 ( -0.22344  0.22381 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10614e-07 ( -1.75118e-08  1.76574e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.236 sec. to    0.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.136759     ( -1.15329   1.49525 )
Epeak [keV] : 60.0203      ( -10.6977 27.8721 )
Norm@50keV  : 9.27983E-02    ( -0.0928   0.426892 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.48     using 59 bins.
 Reduced chi-squared = 0.883571
# Null hypothesis probability of 7.18e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.45291 ( -0.22826  0.22853 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01986e-07 ( -1.77108e-08  1.8451e-08 ) 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 = -1.510084145816508E-01, IMY = 5.469381589651889E-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:
-239.144000 -0.364000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3785  35.1488    5.9  41.5  -46.9   0.9312   2.0   12.2	Her X-1                       
173.9007   9.9906    4.0  35.9  117.0   1.6405   2.9 ------	UNKNOWN                       
244.7998  -1.2003    2.6  51.8    3.7   2.1435   4.4 ------	UNKNOWN                       
250.5458  19.1225    2.6  44.0  -22.9   1.8042   4.5 ------	UNKNOWN                       

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

Time interval of the image:
-0.364000 6.564000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5944  35.3215    5.2  41.7  -47.2  -0.1316  -2.2    6.8	Her X-1                       
139.2371  31.7017    2.2  53.5  167.7   0.5580   5.1 ------	UNKNOWN                       
218.1401  61.2893    0.9  29.6 -105.4   0.5279  12.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
84.356590 962.922100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4788  35.3260    8.6  34.6  -10.9  -1.3884  -1.3    1.4	Her X-1                       
174.1658  37.7594    3.5  35.9  117.0   6.2625   3.3 ------	UNKNOWN                       
141.7559  44.0709    2.7  46.3  152.3  10.9356   4.3 ------	UNKNOWN                       
113.5844  45.9776    3.8  56.9  173.9   8.4027   3.0 ------	UNKNOWN                       
226.5933  44.0077    2.2  18.0   27.4   3.6043   5.2 ------	UNKNOWN                       
258.7257  12.4865    2.8  56.9   -1.9   9.4539   4.1 ------	UNKNOWN                       
278.6235  65.7368    2.7  26.2  -78.7   4.1734   4.3 ------	UNKNOWN                       
276.9083  41.4979    3.0  39.8  -40.6   4.2387   3.9 ------	UNKNOWN                       
 73.7167  57.5390    2.9  58.0 -154.2  18.1437   4.0 ------	UNKNOWN