GRB210104A: 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 00:33:33 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1015873
======================================================================

  Trigger: 01015873      Segment: 000

  BAT Trigger Time: 631452445.376   [s; MET]
      Trigger Stop: 631452445.888   [s; MET]
               UTC: 2021-01-04T11:26:59.104760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 103.704701121309   Dec: 64.6607065720299  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.4
     Image Trigger?:     NO
     Rate S/N Ratio:     23.388031127053  [ if not an image trigger ]
     Image S/N Ratio:    11.4

  Analysis Position:   [ source = BAT ]
    RA: 103.704701121309   Dec: 64.6607065720299  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 103.77102106007   Dec: 64.6746938879883  [deg; J2000]  
        { 06h 55m 05.0s , +64d 40' 28.9" }
         +/- 0.66896971439859 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.21774536466174 [arcmin] (formal 1-sigma fit error)
    SNR: 54.0179038341353
 
  Angular difference between the analysis and refined position is 1.898173 arcmin
 
  Partial Coding Fraction: 0.828125    [ including projection effects ]

  Duration
     T90: 32.0479999780655 +/- 0.489391480672351
        Measured from: 1.5161999464035
                   to: 33.564199924469     [s; relative to TRIGTIME]
     T50: 17.107999920845 +/- 1.35256790447588
        Measured from: 11.2802000045776
                   to: 28.3881999254227     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 26.7761999368668     
                   to: 27.7761999368668     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.999800086021423     
                   to: 45.4041999578476     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.979764   5.345473   3.878844   0.979050
           0.057771   0.062505   0.054751   0.040509 [error]
 Peak      0.351266   0.570670   0.445298   0.113072
           0.012533   0.014831   0.014078   0.008936 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   46.404   -1.000   45.404
T90    32.048    1.516   33.564
T50    17.108   11.280   28.388
Peak    1.000   26.776   27.776
 
 
====== 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      -1.531    -0.035      0.035       -           -               -         1.97e-02     -3.53e-04          3.52e-04      41.150   57
CPL     -1.455    -0.104      0.142      413.608    -413.608      -413.608      2.13e-02     -2.03e-03          3.14e-03      40.280   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      -1.362     -0.058     0.058       -           -               -         9.69e-02     -3.11e-03          3.11e-03      60.760   57
CPL     -1.047     -0.229     0.241      164.371     -48.724       266.660      1.36e-01     -2.91e-02          3.94e-02      55.170   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   1.20e-06  2.17e-06  3.00e-06  8.64e-06  8.63e-06  1.50e-05   erg/cm2
      90%_error_low -4.67e-08 -4.84e-08 -6.25e-08 -4.22e-07 -1.56e-07 -4.44e-07   erg/cm2
      90%_error_hi   4.75e-08  4.83e-08  6.23e-08  4.37e-07  1.56e-07  4.56e-07   erg/cm2
Peak flux       PL   3.49e+00  3.81e+00  2.97e+00  3.80e+00  1.17e+01  1.41e+01   ph/cm2/s
      90%_error_low -2.12e-01 -1.41e-01 -1.15e-01 -3.04e-01 -3.91e-01 -4.60e-01   ph/cm2/s
      90%_error_hi   2.17e-01  1.40e-01  1.14e-01  3.20e-01  3.91e-01  4.61e-01   ph/cm2/s
 
Fluence        CPL   1.18e-06  2.17e-06  3.02e-06  7.85e-06  8.59e-06  1.42e-05   erg/cm2
      90%_error_low -6.42e-08 -4.96e-08 -6.55e-08 -1.23e-06 -1.73e-07 -1.24e-06   erg/cm2
      90%_error_hi   5.60e-08  4.97e-08  7.28e-08  8.89e-07  1.63e-07  9.40e-07   erg/cm2
Peak flux      CPL   3.24e+00  3.89e+00  3.07e+00  2.74e+00  1.15e+01  1.29e+01   ph/cm2/s
      90%_error_low -2.69e-01 -1.54e-01 -1.35e-01 -5.61e-01 -4.14e-01 -7.24e-01   ph/cm2/s
      90%_error_hi   2.75e-01  1.55e-01  1.36e-01  7.35e-01  4.14e-01  8.50e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  103.7710    64.6747   0.0036    20.0461   -49.8385         3.6084321     54.018 TRIG_01015873                 
 
Foreground time interval of the image:
 -1.000   9.925 (delta_t =  10.924 [sec])
Background time interval of the image:
-239.376  -1.000 (delta_t = 238.376 [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   -1.000 sec. to   45.404 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53107     ( -0.0350865   0.0351021 )
Norm@50keV  : 1.97015E-02    ( -0.00035265   0.000352528 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   41.15     using 59 bins.
 Reduced chi-squared = 0.72193
# Null hypothesis probability of 9.44e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 46.4 sec: 2.48072 ( -0.05296  0.05318 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.63096e-06 ( -1.5599e-07  1.5599e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -1.000 sec. to   45.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45493     ( -0.103675   0.141735 )
Epeak [keV] : 413.608      ( -413.836 -413.836 )
Norm@50keV  : 2.12571E-02    ( -0.0020298   0.00314021 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.28     using 59 bins.
 Reduced chi-squared = 0.719286
# Null hypothesis probability of 9.44e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 46.4 sec: 2.46323 ( -0.061  0.05837 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.58952e-06 ( -1.72703e-07  1.62895e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   26.776 sec. to   27.776 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36153     ( -0.0576387   0.0575079 )
Norm@50keV  : 9.68560E-02    ( -0.00310641   0.00310582 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.76     using 59 bins.
 Reduced chi-squared = 1.06596
# Null hypothesis probability of 3.42e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 11.6966 ( -0.3906  0.391 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.4367e-07 ( -3.33166e-08  3.33872e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   26.776 sec. to   27.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.04693     ( -0.229065   0.241444 )
Epeak [keV] : 164.371      ( -48.7248 266.659 )
Norm@50keV  : 0.136028    ( -0.0291182   0.0394046 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.17     using 59 bins.
 Reduced chi-squared = 0.985179
# Null hypothesis probability of 5.06e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 11.5002 ( -0.4137  0.4142 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.25785e-07 ( -3.62153e-08  3.60266e-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 = 2.353283031895482E-01, IMY = 2.788536673001462E-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:
-239.375800 -0.999800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6418  22.0126    0.4  24.7  122.4   9.7932  25.7    0.5	Crab                          
 89.7405  19.1114    2.6  27.3  109.0   1.7268   4.5 ------	UNKNOWN                       
134.6132  27.1540    2.4  40.8   33.0   2.3177   4.7 ------	UNKNOWN                       
 54.6974   9.4638    2.7  46.9  160.2   3.5184   4.3 ------	UNKNOWN                       
108.2758  32.1904    2.5  20.7   57.7   1.3940   4.5 ------	UNKNOWN                       
 60.3069  28.8526    2.2  28.3  172.8   1.5929   5.2 ------	UNKNOWN                       
 71.3791  46.6329    3.2  11.9 -151.4   0.9950   3.6 ------	UNKNOWN                       
182.9525  55.3169    2.1  55.5  -25.3   6.4235   5.4 ------	UNKNOWN                       
157.6688  76.9791    3.1  40.4  -49.9   2.3320   3.7 ------	UNKNOWN                       
 16.7136  70.1485    5.7  41.1  -98.2   2.9415   2.0 ------	UNKNOWN                       

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

Time interval of the image:
-0.999800 9.924590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5134  21.9330   31.4  24.8  122.7   0.0319   0.4    8.3	Crab                          
 66.1745   2.4835    2.5  48.1  142.1   1.4188   4.6 ------	UNKNOWN                       
 88.7798  42.6843    2.1   3.7  110.1   0.3330   5.6 ------	UNKNOWN                       
 35.9928  16.3656    2.7  52.8 -175.4   0.7700   4.4 ------	UNKNOWN                       
103.7710  64.6747    0.2  20.0  -49.8   3.6082  54.0 ------	UNKNOWN                       
 27.5371  36.4179    3.3  45.8 -148.5   0.4202   3.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
51.924600 710.928300
720.624000 962.732400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
116.0396  28.4714    3.2  37.0   74.6   8.1146   3.6 ------	UNKNOWN                       
120.1358  28.6414    2.9  37.5   68.7   7.4027   4.0 ------	UNKNOWN                       
109.1542  29.9787    2.8  34.8   84.5   7.6193   4.1 ------	UNKNOWN                       
 92.8392  37.6304    2.9  27.8  111.5   4.4954   4.0 ------	UNKNOWN                       
120.7812  46.0876    3.4  20.8   57.7   3.0235   3.4 ------	UNKNOWN                       
184.2581  31.1088    4.0  58.2   -3.6  13.1186   2.9 ------	UNKNOWN                       
 15.6338  36.0196    3.5  57.1 -161.5  13.1808   3.3 ------	UNKNOWN                       
212.2591  71.9102    3.4  35.3  -56.6   4.5314   3.4 ------	UNKNOWN                       
207.1719  50.6288    3.0  50.6  -34.2   9.3849   3.8 ------	UNKNOWN                       
310.5525  73.0241    2.8  41.2  -98.8  16.2609   4.2 ------	UNKNOWN