GRB221120A: 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: Wed Jun 14 12:09:11 EDT 2023
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1141030
======================================================================

  Trigger: 01141030      Segment: 000

  BAT Trigger Time: 690672598.4   [s; MET]
      Trigger Stop: 690672598.656   [s; MET]
               UTC: 2022-11-20T21:29:28.146920    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 41.3447019871665   Dec: 43.2031229320889  [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:     26.7768556779918  [ if not an image trigger ]
     Image S/N Ratio:    7.27

  Analysis Position:   [ source = BAT ]
    RA: 41.3447019871665   Dec: 43.2031229320889  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 41.3625338171834   Dec: 43.2405266763403  [deg; J2000]  
        { 02h 45m 27.0s , +43d 14' 25.9" }
         +/- 1.84724267837746 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.86150877349655 [arcmin] (formal 1-sigma fit error)
    SNR: 12.6581394093164
 
  Angular difference between the analysis and refined position is 2.375795 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 0.79200005531311 +/- 0.1600999894275
        Measured from: -0.544000029563904
                   to: 0.248000025749207     [s; relative to TRIGTIME]
     T50: 0.471999883651733 +/- 0.0824621495203577
        Measured from: -0.327999949455261
                   to: 0.143999934196472     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.666000008583069     
                   to: 0.333999991416931     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.603999972343445     
                   to: 0.272000074386597     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.028693   0.047533   0.059009   0.024726
           0.006804   0.007477   0.007604   0.006443 [error]
 Peak      0.029280   0.049052   0.057904   0.023932
           0.007233   0.007830   0.007882   0.006737 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.876   -0.604    0.272
T90     0.792   -0.544    0.248
T50     0.472   -0.328    0.144
Peak    1.000   -0.666    0.334
 
 
====== 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: PL)
 
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      -0.846    -0.260      0.274       -           -               -         1.16e-02     -1.71e-03          1.69e-03      54.830   57
CPL     -0.766    -0.338      0.984      880.699    -880.699      -880.699      1.26e-02     -1.26e-02          1.93e-02      54.870   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
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      -0.863     -0.275     0.292       -           -               -         1.02e-02     -1.57e-03          1.55e-03      47.770   57
CPL     -0.789     -0.351     0.805      935.164    -935.164      -935.164      1.11e-02     -2.33e-03          -1.11e-02      47.910   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   7.03e-09  1.93e-08  4.30e-08  2.54e-07  1.16e-07  3.23e-07   erg/cm2
      90%_error_low -2.08e-09 -3.60e-09 -6.87e-09 -8.38e-08 -1.85e-08 -8.80e-08   erg/cm2
      90%_error_hi   2.31e-09  3.49e-09  6.77e-09  1.12e-07  1.86e-08  1.13e-07   erg/cm2
Peak flux       PL   2.29e-01  3.38e-01  3.72e-01  7.68e-01  1.17e+00  1.71e+00   ph/cm2/s
      90%_error_low -7.21e-02 -6.80e-02 -6.03e-02 -2.49e-01 -1.78e-01 -2.92e-01   ph/cm2/s
      90%_error_hi   8.09e-02  6.58e-02  5.93e-02  3.26e-01  1.78e-01  3.21e-01   ph/cm2/s
 
Fluence        CPL   2.08e-09  2.78e-09  2.88e-09  6.98e-09  9.60e-09  1.49e-08   erg/cm2
      90%_error_low -2.08e-09 -2.78e-09 -2.88e-09    N/A    -9.60e-09    N/A      erg/cm2
      90%_error_hi   2.25e-09  2.05e-08  3.04e-09    N/A     1.11e-08    N/A      erg/cm2
Peak flux      CPL   2.35e-01  3.39e-01  3.70e-01  8.21e-01  1.18e+00  1.67e+00   ph/cm2/s
      90%_error_low -8.77e-02 -4.84e-02 -5.89e-02 -8.21e-01 -2.02e-01 -4.41e-01   ph/cm2/s
      90%_error_hi   6.46e-02  6.57e-02  6.66e-02  -6.98e-01  1.89e-01  3.32e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   41.3625    43.2405   0.0152    14.9680   -25.7135         0.1851061     12.658 TRIG_01141030                 
 
Foreground time interval of the image:
 -0.604   0.272 (delta_t =   0.876 [sec])
Background time interval of the image:
-84.699  -0.604 (delta_t =  84.095 [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   -0.604 sec. to    0.272 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.846208     ( -0.26011   0.274296 )
Norm@50keV  : 1.15558E-02    ( -0.00170997   0.00169276 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.83     using 59 bins.
 Reduced chi-squared = 0.96193
# Null hypothesis probability of 5.57e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 0.876 sec: 1.32657 ( -0.19364  0.19414 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16071e-07 ( -1.84586e-08  1.86249e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.604 sec. to    0.272 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.839452     ( -0.328542   0.993253 )
Epeak [keV] : 9999.31      ( -9999.32 -9999.32 )
Norm@50keV  : 1.16358E-02    ( -0.0116358   0.0201885 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.83     using 59 bins.
 Reduced chi-squared = 0.979107
# Null hypothesis probability of 5.19e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 0.876 sec: 1.32835 ( -0.20203  0.1945 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.60429e-09 ( -9.60429e-09  1.11135e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.666 sec. to    0.334 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.863431     ( -0.275387   0.291511 )
Norm@50keV  : 1.02227E-02    ( -0.00156715   0.00155015 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.77     using 59 bins.
 Reduced chi-squared = 0.83807
# Null hypothesis probability of 8.03e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.17330 ( -0.177839  0.17834 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16405e-07 ( -1.92668e-08  1.94545e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.666 sec. to    0.334 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.856949     ( -0.347812   0.80803 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 1.02916E-02    ( -0.00157424   -0.0102921 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.78     using 59 bins.
 Reduced chi-squared = 0.853214
# Null hypothesis probability of 7.75e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.17873 ( -0.201992  0.18892 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.23914e-08 ( -1.23914e-08  9.96851e-09 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.7920001 sec.
Hardness ratio (energy fluence ratio) = 2.22499944437

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

S(15-50 keV)  = 2.6381337e-08
S(50-150 keV) = 8.968871e-08

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 = 2.408769696907946E-01, IMY = 1.159959397182839E-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:
-84.699400 -0.604000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6174  22.0027    1.2  41.9   51.6   3.3691   9.2    1.1	Crab                          
 91.7010  64.7874    2.6  49.3   -9.5   1.2429   4.5 ------	UNKNOWN                       
 86.8555  77.6171    2.1  53.8  -25.0   3.7678   5.4 ------	UNKNOWN                       
354.2453  11.1600    2.4  44.0 -140.9   1.5536   4.9 ------	UNKNOWN                       

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

Time interval of the image:
-0.604000 0.272000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6845  22.0069   20.5  42.0   51.6   0.0215   0.6    2.9	Crab                          
 96.5151  45.8414    2.0  48.8   15.9   0.1796   5.7 ------	UNKNOWN                       
 27.9434  11.6500    2.0  19.2  173.2   0.0843   5.8 ------	UNKNOWN                       
 41.3625  43.2405    0.9  15.0  -25.7   0.1851  12.7 ------	UNKNOWN                       
352.3487  55.6161    2.4  41.9  -73.5   0.2717   4.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
76.300590 720.236600
720.600000 785.166500
786.600000 962.611600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6357  21.9923    0.6  40.9   50.6  32.4464  19.7    1.3	Crab                          
 77.4759  47.6436    2.2  25.5   10.4   4.6421   5.2 ------	UNKNOWN                       
101.6005  63.8640    3.1  39.3  -19.7   4.5996   3.8 ------	UNKNOWN                       
343.9442  80.4900    3.1  42.3  -68.8  14.5374   3.7 ------	UNKNOWN                       
341.4734  80.4244    3.6  42.6  -69.2  13.0148   3.3 ------	UNKNOWN                       
338.7367  73.9356    3.4  41.4  -78.7  14.2862   3.4 ------	UNKNOWN