GRB201209A: 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: Sat Jul 30 00:47:25 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1011980
======================================================================

  Trigger: 01011980      Segment: 000

  BAT Trigger Time: 629185518.656   [s; MET]
      Trigger Stop: 629185519.68   [s; MET]
               UTC: 2020-12-09T05:44:52.534740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 23.1056567215306   Dec: -1.76338021356593  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.19
     Image Trigger?:     NO
     Rate S/N Ratio:     43.2434966208793  [ if not an image trigger ]
     Image S/N Ratio:    10.19

  Analysis Position:   [ source = BAT ]
    RA: 23.1056567215306   Dec: -1.76338021356593  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 23.0969626925961   Dec: -1.76291815011866  [deg; J2000]  
        { 01h 32m 23.3s , -01d 45' 46.5" }
         +/- 1.12924656720917 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.360167182451262 [arcmin] (formal 1-sigma fit error)
    SNR: 25.5685346200828
 
  Angular difference between the analysis and refined position is 0.522131 arcmin
 
  Partial Coding Fraction: 0.1142578    [ including projection effects ]

  Duration
     T90: 48 +/- 16
        Measured from: -31.6560000181198
                   to: 16.3439999818802     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: -15.6560000181198
                   to: 0.343999981880188     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 7.84399998188019     
                   to: 8.84399998188019     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -31.6560000181198     
                   to: 32.3439999818802     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.483643   7.638293   5.879188   1.857087
           0.221120   0.234824   0.201594   0.162980 [error]
 Peak      0.276333   0.535227   0.408129   0.144483
           0.034294   0.043331   0.039335   0.028534 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   64.000  -31.656   32.344
T90    48.000  -31.656   16.344
T50    16.000  -15.656    0.344
Peak    1.000    7.844    8.844
 
 
====== 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      -1.562    -0.062      0.062       -           -               -         2.30e-02     -8.17e-04          8.17e-04      85.210   57
CPL     -1.253    -0.245      0.259      131.950     -36.711       257.377      3.21e-02     -7.29e-03          1.01e-02      80.510   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      -1.498     -0.148     0.147       -           -               -         9.82e-02     -8.90e-03          8.87e-03      53.270   57
CPL     -1.213     -0.365     0.687      148.071     -70.662      -148.071      1.35e-01     -4.45e-02          1.52e-01      52.660   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   2.00e-06  3.53e-06  4.78e-06  1.33e-05  1.39e-05  2.37e-05   erg/cm2
      90%_error_low -1.35e-07 -1.45e-07 -2.01e-07 -1.19e-06 -5.05e-07 -1.32e-06   erg/cm2
      90%_error_hi   1.38e-07  1.44e-07  2.00e-07  1.27e-06  5.05e-07  1.37e-06   erg/cm2
Peak flux       PL   4.03e+00  4.06e+00  2.88e+00  3.24e+00  1.23e+01  1.42e+01   ph/cm2/s
      90%_error_low -6.21e-01 -4.06e-01 -3.11e-01 -6.55e-01 -1.15e+00 -1.28e+00   ph/cm2/s
      90%_error_hi   6.50e-01  4.02e-01  3.07e-01  7.38e-01  1.15e+00  1.28e+00   ph/cm2/s
 
Fluence        CPL   1.86e-06  3.62e-06  4.93e-06  9.02e-06  1.37e-05  1.94e-05   erg/cm2
      90%_error_low -1.66e-07 -1.62e-07 -2.33e-07 -2.30e-06 -5.33e-07 -2.32e-06   erg/cm2
      90%_error_hi   1.70e-07  1.63e-07  2.35e-07  3.26e-06  5.32e-07  3.23e-06   erg/cm2
Peak flux      CPL   2.96e+00  1.88e+00  8.04e-01  6.09e-01  5.90e+00  6.16e+00   ph/cm2/s
      90%_error_low -9.12e-01 -5.81e-01 -4.10e-01 8.33e-02 -1.46e+00 -1.72e+00   ph/cm2/s
      90%_error_hi   9.51e-01  7.82e-01  4.72e-01  6.11e-01  2.07e+00  2.27e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   23.0970    -1.7629   0.0075    50.8417   169.3183        18.3744612     25.569 TRIG_01011980                 
 
Foreground time interval of the image:
-31.656  11.445 (delta_t =  43.101 [sec])
Background time interval of the image:
-199.155 -31.656 (delta_t = 167.499 [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  -31.656 sec. to   32.344 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56221     ( -0.0619481   0.0620561 )
Norm@50keV  : 2.30320E-02    ( -0.000816966   0.000816966 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   85.21     using 59 bins.
 Reduced chi-squared = 1.49491
# Null hypothesis probability of 9.13e-03 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 64 sec: 2.92621 ( -0.11674  0.11713 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.38551e-05 ( -5.04529e-07  5.05079e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -31.656 sec. to   32.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.253     ( -0.245156   0.25931 )
Epeak [keV] : 131.950      ( -36.7121 257.376 )
Norm@50keV  : 3.21431E-02    ( -0.00729489   0.0100702 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   80.51     using 59 bins.
 Reduced chi-squared = 1.43768
# Null hypothesis probability of 1.76e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 64 sec: 2.87527 ( -0.12274  0.12322 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.3654e-05 ( -5.33226e-07  5.31658e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    7.844 sec. to    8.844 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49792     ( -0.148038   0.146628 )
Norm@50keV  : 9.81969E-02    ( -0.0088976   0.00887446 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.27     using 59 bins.
 Reduced chi-squared = 0.934561
# Null hypothesis probability of 6.16e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 12.2523 ( -1.1524  1.1543 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.31987e-07 ( -8.9545e-08  8.98697e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    7.844 sec. to    8.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21322     ( -0.365227   0.686711 )
Epeak [keV] : 148.071      ( -70.6743 -148.084 )
Norm@50keV  : 0.135207    ( -0.0444706   0.151563 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.66     using 59 bins.
 Reduced chi-squared = 0.940357
# Null hypothesis probability of 6.02e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.89702 ( -1.45523  2.06523 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.24358e-07 ( -4.97771e-08  9.18673e-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 = -1.206666607996190E+00, IMY = -2.276023443369052E-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:
-199.155400 -31.656000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6156  22.0255    1.1  34.2   69.1   6.8335  10.4    1.2	Crab                          
 74.7803   7.7557    2.8  40.8   94.4   5.7616   4.2 ------	UNKNOWN                       
 84.7340  26.3127    0.3  32.1   62.0  20.3222  33.9 ------	UNKNOWN                       
 27.8804  -5.7572    2.8  52.6  161.7   6.3573   4.2 ------	UNKNOWN                       
125.4569  42.4944    2.7  53.2   15.4   4.8951   4.3 ------	UNKNOWN                       
 17.3725   7.3799    2.5  45.8 -177.9   3.1126   4.7 ------	UNKNOWN                       
  9.2292  30.9497    3.0  34.8 -143.0   1.6952   3.9 ------	UNKNOWN                       
351.3429  25.3563    2.3  51.0 -137.1   7.6807   5.1 ------	UNKNOWN                       

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

Time interval of the image:
-31.656000 11.444600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5220  21.9264    4.5  34.2   69.3   0.7458   2.6    8.1	Crab                          
 55.1593  15.1343    2.7  27.7  123.3   0.8188   4.3 ------	UNKNOWN                       
 23.0970  -1.7629    0.5  50.8  169.3  18.3751  25.6 ------	UNKNOWN                       
 36.6936  33.8978    2.5  14.0 -171.1   0.5397   4.7 ------	UNKNOWN                       
128.6595  71.4031    2.5  46.4  -21.8   0.9217   4.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
99.444590 962.427100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
352.9920  20.7673    3.8  37.1  -22.1   2.9607   3.1 ------	UNKNOWN                       
348.3534   1.5462    3.5  34.9  -55.9   4.2735   3.3 ------	UNKNOWN                       
  2.6558 -47.7142    3.3  49.3 -133.0  12.7459   3.5 ------	UNKNOWN                       
359.8755 -45.1308    2.5  48.0 -129.1  15.9859   4.7 ------	UNKNOWN