GRB210323A: 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: Fri Jul 29 23:44:07 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1038247
======================================================================

  Trigger: 01038247      Segment: 000

  BAT Trigger Time: 638229765.184   [s; MET]
      Trigger Stop: 638229765.248   [s; MET]
               UTC: 2021-03-23T22:02:18.464260    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 317.952404831532   Dec: 25.3779613350552  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.41
     Image Trigger?:     NO
     Rate S/N Ratio:     41.1703777004778  [ if not an image trigger ]
     Image S/N Ratio:    11.41

  Analysis Position:   [ source = BAT ]
    RA: 317.952404831532   Dec: 25.3779613350552  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 317.944940772893   Dec: 25.3523417898211  [deg; J2000]  
        { 21h 11m 46.8s , +25d 21' 08.4" }
         +/- 1.44634869399025 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.603476226560251 [arcmin] (formal 1-sigma fit error)
    SNR: 17.9538230409482
 
  Angular difference between the analysis and refined position is 1.589546 arcmin
 
  Partial Coding Fraction: 0.765625    [ including projection effects ]

  Duration
     T90: 1.12000000476837 +/- 0.322893082552845
        Measured from: -0.0720000267028809
                   to: 1.04799997806549     [s; relative to TRIGTIME]
     T50: 0.247999906539917 +/- 0.109178796885355
        Measured from: 0.00800001621246338
                   to: 0.25599992275238     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0959999561309814     
                   to: 0.904000043869019     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0920000076293945     
                   to: 1.25600004196167     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.105003   0.140407   0.110229   0.028012
           0.011194   0.011800   0.011049   0.009198 [error]
 Peak      0.096267   0.127363   0.107437   0.026438
           0.010015   0.010766   0.010214   0.008364 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    1.348   -0.092    1.256
T90     1.120   -0.072    1.048
T50     0.248    0.008    0.256
Peak    1.000   -0.096    0.904
 
 
====== 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      -1.456    -0.167      0.166       -           -               -         1.90e-02     -1.80e-03          1.79e-03      53.630   57
CPL     -1.397    -0.874      0.568      511.583    -511.583      -511.583      2.03e-02     -6.88e-03          1.80e-02      53.680   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      -1.393     -0.165     0.164       -           -               -         2.42e-02     -2.20e-03          2.19e-03      55.520   57
CPL     -1.358     -0.200     0.449      959.621    -959.621      -959.621      2.52e-02     -3.13e-03          1.25e-03      55.620   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   3.13e-08  5.91e-08  8.62e-08  2.68e-07  2.44e-07  4.45e-07   erg/cm2
      90%_error_low -4.89e-09 -5.69e-09 -1.08e-08 -6.60e-08 -2.58e-08 -7.54e-08   erg/cm2
      90%_error_hi   5.08e-09  5.65e-09  1.07e-08  7.97e-08  2.61e-08  8.67e-08   erg/cm2
Peak flux       PL   8.99e-01  9.64e-01  7.34e-01  9.11e-01  2.94e+00  3.51e+00   ph/cm2/s
      90%_error_low -1.43e-01 -9.45e-02 -8.50e-02 -2.05e-01 -2.66e-01 -3.25e-01   ph/cm2/s
      90%_error_hi   1.50e-01  9.34e-02  8.41e-02  2.40e-01  2.66e-01  3.29e-01   ph/cm2/s
 
Fluence        CPL   3.14e-08  5.90e-08  8.61e-08  2.73e-07  2.45e-07  4.51e-07   erg/cm2
      90%_error_low -5.21e-09 -5.53e-09 -1.08e-08 -1.69e-07 -2.89e-08 -1.79e-07   erg/cm2
      90%_error_hi   5.66e-09  6.93e-09  1.16e-08  3.89e-08  2.15e-08  4.15e-08   erg/cm2
Peak flux      CPL   7.12e-01  4.54e-01  1.96e-01  1.40e-01  1.42e+00  1.49e+00   ph/cm2/s
      90%_error_low -1.99e-01 -1.28e-01 -8.43e-02 2.08e-02 -4.02e-01 -4.22e-01   ph/cm2/s
      90%_error_hi   2.03e-01  1.50e-01  1.39e-01  1.45e-01  4.46e-01  5.39e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  317.9449    25.3523   0.0107    30.3162   -22.4353         0.4002490     17.954 TRIG_01038247                 
 
Foreground time interval of the image:
 -0.092   1.256 (delta_t =   1.348 [sec])
Background time interval of the image:
-19.083  -0.092 (delta_t =  18.991 [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   -0.092 sec. to    1.256 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45562     ( -0.166856   0.165649 )
Norm@50keV  : 1.89549E-02    ( -0.00179892   0.00178719 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.63     using 59 bins.
 Reduced chi-squared = 0.940877
# Null hypothesis probability of 6.02e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1.348 sec: 2.33926 ( -0.21723  0.2175 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.44287e-07 ( -2.5793e-08  2.61085e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.092 sec. to    1.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45289     ( -0.868206   0.574258 )
Epeak [keV] : 9998.38      ( -9998.49 -9998.49 )
Norm@50keV  : 1.90168E-02    ( -0.00558584   0.0193319 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.63     using 59 bins.
 Reduced chi-squared = 0.957679
# Null hypothesis probability of 5.65e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1.348 sec: 1.51509 ( -0.37074  0.31911 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.44647e-07 ( -2.88976e-08  2.14498e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.096 sec. to    0.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39327     ( -0.164686   0.163945 )
Norm@50keV  : 2.41883E-02    ( -0.00220385   0.00219379 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.52     using 59 bins.
 Reduced chi-squared = 0.974035
# Null hypothesis probability of 5.31e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.94127 ( -0.26605  0.26642 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34078e-07 ( -2.40535e-08  2.43324e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.096 sec. to    0.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39025     ( -0.200291   0.449063 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 2.42752E-02    ( -0.00221766   0.00215589 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.53     using 59 bins.
 Reduced chi-squared = 0.991607
# Null hypothesis probability of 4.93e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.42409 ( -0.40211  0.44632 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.36331e-07 ( -2.68764e-08  2.17702e-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 = 5.404735181931878E-01, IMY = 2.231571670947622E-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:
-19.083400 -0.092000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7594  10.9292   31.4  53.7    9.6   0.0798   0.4    2.5	GRS 1915+105                  
299.5880  35.3590    3.2  27.7   16.3   0.2406   3.6    9.4	Cyg X-1                       
307.8575  40.8811    0.0  19.4   11.7   0.2149   3.8   12.2	Cyg X-3                       
326.2987  38.4315    5.4  16.3  -35.6   0.1248   2.1    8.9	Cyg X-2                       
283.0477  13.5075    2.4  54.1   17.2   1.3120   4.8 ------	UNKNOWN                       
306.2217  -1.8534    2.2  59.4  -15.4   1.9746   5.2 ------	UNKNOWN                       
 62.9687  41.4907    2.6  59.6 -161.4   1.7531   4.5 ------	UNKNOWN                       

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

Time interval of the image:
-0.092000 1.256000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7847  11.0568    8.5  53.6    9.7   0.1004   1.3    6.7	GRS 1915+105                  
299.5374  35.3408    4.6  27.7   16.4  -0.0558  -2.5    8.7	Cyg X-1                       
308.1924  40.7536    0.0  19.3   10.9   0.0081   0.4   12.5	Cyg X-3                       
325.9519  38.2698    4.6  16.5  -34.7   0.0458   2.5   10.8	Cyg X-2                       
317.9450  25.3524    0.6  30.3  -22.4   0.4002  18.0 ------	UNKNOWN                       
 57.2925  38.0522    1.8  59.2 -154.9   0.7243   6.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
69.316600 962.859600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.9129  11.0574    6.6  31.0   46.5   2.4087   1.7    9.5	GRS 1915+105                  
299.6121  35.1663    2.4  18.6  104.8   5.0177   4.9    2.4	Cyg X-1                       
308.1315  40.9070    3.2  17.6  133.4   3.2739   3.6    2.9	Cyg X-3                       
326.1594  38.2187    5.9  14.6 -174.9   1.7566   2.0    6.2	Cyg X-2                       
280.7769  22.2548    3.0  34.0   71.4   7.3121   3.9 ------	UNKNOWN                       
310.6977  23.0244    2.7   7.0   50.7   3.2004   4.4 ------	UNKNOWN                       
302.4285  -3.6034    2.5  32.7    8.4   4.7651   4.7 ------	UNKNOWN                       
 19.1401  43.7174    3.4  52.3 -148.2   8.9097   3.4 ------	UNKNOWN