GRB220118A: 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 23:44:13 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1093742
======================================================================

  Trigger: 01093742      Segment: 000

  BAT Trigger Time: 664222866.56   [s; MET]
      Trigger Stop: 664222867.584   [s; MET]
               UTC: 2022-01-18T18:20:38.099740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 192.274400418694   Dec: 22.9093590537508  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.36
     Image Trigger?:     NO
     Rate S/N Ratio:     16.4012194668567  [ if not an image trigger ]
     Image S/N Ratio:    7.36

  Analysis Position:   [ source = BAT ]
    RA: 192.274400418694   Dec: 22.9093590537508  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 192.276912171737   Dec: 22.9104792326595  [deg; J2000]  
        { 12h 49m 06.5s , +22d 54' 37.7" }
         +/- 1.3564416411626 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.666901727869427 [arcmin] (formal 1-sigma fit error)
    SNR: 19.6776817294017
 
  Angular difference between the analysis and refined position is 0.154232 arcmin
 
  Partial Coding Fraction: 0.2265625    [ including projection effects ]

  Duration
     T90: 10.6080000400543 +/- 1.77952803014474
        Measured from: -2.31199991703033
                   to: 8.29600012302399     [s; relative to TRIGTIME]
     T50: 4.8639999628067 +/- 0.823222883716814
        Measured from: -0.119999885559082
                   to: 4.74400007724762     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.684000015258789     
                   to: 1.68400001525879     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.89599990844727     
                   to: 9.5440000295639     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.712149   1.100912   0.783525   0.183637
           0.061468   0.065637   0.060273   0.047571 [error]
 Peak      0.093993   0.126883   0.135520   0.025227
           0.017892   0.019042   0.018840   0.013314 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.440   -3.896    9.544
T90    10.608   -2.312    8.296
T50     4.864   -0.120    4.744
Peak    1.000    0.684    1.684
 
 
====== 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      -1.667    -0.122      0.120       -           -               -         1.43e-02     -1.07e-03          1.06e-03      43.980   57
CPL     -1.107    -0.484      0.543       77.628     -18.232       152.887      2.80e-02     -1.20e-02          2.47e-02      40.010   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      -1.547     -0.254     0.243       -           -               -         2.60e-02     -4.01e-03          3.98e-03      46.140   57
CPL     -1.299     -0.489     1.042      154.407    -154.407      -154.407      3.42e-02     -2.53e-02          7.01e-02      45.910   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   2.88e-07  4.78e-07  6.02e-07  1.51e-06  1.79e-06  2.88e-06   erg/cm2
      90%_error_low -3.24e-08 -3.45e-08 -5.86e-08 -2.84e-07 -1.40e-07 -3.40e-07   erg/cm2
      90%_error_hi   3.33e-08  3.45e-08  5.84e-08  3.24e-07  1.41e-07  3.69e-07   erg/cm2
Peak flux       PL   1.12e+00  1.09e+00  7.49e-01  8.06e-01  3.28e+00  3.77e+00   ph/cm2/s
      90%_error_low -2.70e-01 -1.76e-01 -1.43e-01 -2.72e-01 -5.05e-01 -5.68e-01   ph/cm2/s
      90%_error_hi   2.89e-01  1.74e-01  1.40e-01  3.30e-01  5.06e-01  5.70e-01   ph/cm2/s
 
Fluence        CPL   2.64e-07  5.08e-07  6.20e-07  6.89e-07  1.72e-06  2.08e-06   erg/cm2
      90%_error_low -3.82e-08 -4.33e-08 -6.42e-08 -3.17e-07 -1.52e-07 -3.51e-07   erg/cm2
      90%_error_hi   3.87e-08  4.43e-08  6.50e-08  6.54e-07  1.53e-07  6.51e-07   erg/cm2
Peak flux      CPL   1.06e+00  1.12e+00  7.76e-01  6.36e-01  3.26e+00  3.59e+00   ph/cm2/s
      90%_error_low -3.33e-01 -1.94e-01 -1.63e-01 -3.75e-01 -5.11e-01 -6.71e-01   ph/cm2/s
      90%_error_hi   3.30e-01  2.04e-01  1.77e-01  2.58e-01  5.11e-01  7.03e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  192.2769    22.9105   0.0097    42.8204    37.1462         2.8220343     19.678 TRIG_01093742                 
 
Foreground time interval of the image:
 -3.896   9.544 (delta_t =  13.440 [sec])
Background time interval of the image:
-114.859  -3.896 (delta_t = 110.963 [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   -3.896 sec. to    9.544 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66734     ( -0.122046   0.120095 )
Norm@50keV  : 1.43326E-02    ( -0.00106796   0.00106136 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   43.98     using 59 bins.
 Reduced chi-squared = 0.771579
# Null hypothesis probability of 8.97e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 13.44 sec: 1.88240 ( -0.13619  0.13636 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78878e-06 ( -1.39902e-07  1.4087e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -3.896 sec. to    9.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.1071     ( -0.484191   0.543304 )
Epeak [keV] : 77.6276      ( -18.2321 152.887 )
Norm@50keV  : 2.79617E-02    ( -0.012035   0.0247284 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.01     using 59 bins.
 Reduced chi-squared = 0.714464
# Null hypothesis probability of 9.47e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 13.44 sec: 1.84061 ( -0.14103  0.14102 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.72211e-06 ( -1.52145e-07  1.52625e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.684 sec. to    1.684 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.54691     ( -0.254002   0.24328 )
Norm@50keV  : 2.59553E-02    ( -0.0040113   0.00397818 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.14     using 59 bins.
 Reduced chi-squared = 0.809474
# Null hypothesis probability of 8.48e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.28295 ( -0.50522  0.50601 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.44489e-07 ( -4.03199e-08  4.0475e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.684 sec. to    1.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29927     ( -0.488773   1.04244 )
Epeak [keV] : 154.407      ( -154.406 -154.406 )
Norm@50keV  : 3.41761E-02    ( -0.025347   0.0701244 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   45.91     using 59 bins.
 Reduced chi-squared = 0.819821
# Null hypothesis probability of 8.30e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.26276 ( -0.51075  0.51114 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.43461e-07 ( -4.11218e-08  4.09e-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 = 7.386484562865351E-01, IMY = -5.595721947618852E-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:
-114.859400 -3.896000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4323  35.3556    1.7  27.1  -67.2   1.4848   7.0    1.5	Her X-1                       
184.2484  27.7601    2.7  42.6   50.0   1.8258   4.3 ------	UNKNOWN                       
201.2413  26.1630    2.6  36.1   28.2   1.0829   4.5 ------	UNKNOWN                       
220.9009  12.3564    3.0  44.4   -5.6   1.0329   3.9 ------	UNKNOWN                       
259.7799  39.3587    2.7  26.3  -80.1   0.8815   4.2 ------	UNKNOWN                       
298.8954  51.2945    2.5  39.8 -130.4   1.3655   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-3.896000 9.544000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4107  35.3709    3.4  27.1  -67.2  -0.2199  -3.4    2.9	Her X-1                       
192.2769  22.9105    0.6  42.8   37.1   2.8223  19.7 ------	UNKNOWN                       
252.8949  11.5701    2.1  48.4  -49.0   1.2005   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
79.140600 435.540600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
182.9225 -34.5513    3.2  58.1   -3.8   7.6281   3.6 ------	UNKNOWN                       
186.1193 -33.5740    3.1  56.8   -6.8   5.7703   3.8 ------	UNKNOWN                       
255.6687  67.9346    2.3  59.0 -169.8  12.7674   5.1 ------	UNKNOWN                       
255.2395  47.0453    2.1  55.2 -145.2  11.6758   5.4 ------	UNKNOWN                       
248.1772  37.1645    2.3  49.7 -133.0   8.2131   5.0 ------	UNKNOWN