GRB210402A: 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 23:42:15 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1040123
======================================================================

  Trigger: 01040123      Segment: 000

  BAT Trigger Time: 639093824   [s; MET]
      Trigger Stop: 639093896   [s; MET]
               UTC: 2021-04-02T22:03:17.222860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 198.259947568503   Dec: 44.5125955041343  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    24.08
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    24.08

  Analysis Position:   [ source = BAT ]
    RA: 198.259947568503   Dec: 44.5125955041343  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 198.28400223477   Dec: 44.5104422184498  [deg; J2000]  
        { 13h 13m 08.2s , +44d 30' 37.6" }
         +/- 1.0624681864995 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.367293002309736 [arcmin] (formal 1-sigma fit error)
    SNR: 27.8948600819655
 
  Angular difference between the analysis and refined position is 1.037294 arcmin
 
  Partial Coding Fraction: 0.6953125    [ including projection effects ]

  Duration
     T90: 238.707999944687 +/- 18.7908142212934
        Measured from: 1.15600001811981
                   to: 239.863999962807     [s; relative to TRIGTIME]
     T50: 132.703999996185 +/- 7.47823423873571
        Measured from: 52.095999956131
                   to: 184.799999952316     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 173.531999945641     
                   to: 174.531999945641     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -51.6039999723434     
                   to: 310.200000047684     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     5.112057   6.090382   3.590196   0.635886
           0.129970   0.136692   0.127648   0.131169 [error]
 Peak      0.064726   0.067652   0.049890   0.016135
           0.006882   0.007536   0.006723   0.006457 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  361.804  -51.604  310.200
T90   238.708    1.156  239.864
T50   132.704   52.096  184.800
Peak    1.000  173.532  174.532
 
 
====== 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      -1.839    -0.064      0.063       -           -               -         2.61e-03     -8.78e-05          8.74e-05      63.960   57
CPL     -1.498    -0.260      0.277       70.179     -13.140        67.191      3.89e-03     -1.00e-03          1.47e-03      58.880   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      -1.603     -0.220     0.213       -           -               -         1.18e-02     -1.51e-03          1.48e-03      36.460   57
CPL     -1.605     -0.218     0.217     9999.220    -9999.220      -9999.220      1.18e-02     -1.02e-02          8.40e-03      36.470   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   1.66e-06  2.48e-06  2.77e-06  5.86e-06  8.67e-06  1.28e-05   erg/cm2
      90%_error_low -9.23e-08 -7.97e-08 -1.30e-07 -5.82e-07 -2.95e-07 -6.81e-07   erg/cm2
      90%_error_hi   9.43e-08  7.96e-08  1.30e-07  6.26e-07  2.96e-07  7.15e-07   erg/cm2
Peak flux       PL   5.36e-01  5.07e-01  3.34e-01  3.41e-01  1.52e+00  1.72e+00   ph/cm2/s
      90%_error_low -9.72e-02 -5.80e-02 -5.70e-02 -1.05e-01 -1.70e-01 -2.01e-01   ph/cm2/s
      90%_error_hi   1.01e-01  5.77e-02  5.65e-02  1.31e-01  1.70e-01  2.04e-01   ph/cm2/s
 
Fluence        CPL   1.56e-06  2.54e-06  2.78e-06  3.46e-06  8.36e-06  1.03e-05   erg/cm2
      90%_error_low -1.16e-07 -9.33e-08 -1.36e-07 -1.07e-06 -3.72e-07 -1.15e-06   erg/cm2
      90%_error_hi   1.18e-07  9.43e-08  1.37e-07  1.66e-06  3.73e-07  1.71e-06   erg/cm2
Peak flux      CPL   5.49e-01  4.96e-01  3.31e-01  3.40e-01  1.52e+00  1.77e+00   ph/cm2/s
      90%_error_low     N/A   -4.66e-02     N/A       N/A   -1.75e-01 -2.57e-01   ph/cm2/s
      90%_error_hi      N/A    6.99e-02     N/A       N/A    1.70e-01  1.30e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  198.2840    44.5104   0.0069    31.2901     3.6820         7.0618146     27.895 TRIG_01040123                 
 
Foreground time interval of the image:
-51.604  80.701 (delta_t = 132.305 [sec])
Background time interval of the image:
-239.000 -51.604 (delta_t = 187.396 [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  -51.604 sec. to  310.200 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.83892     ( -0.0638578   0.0632978 )
Norm@50keV  : 2.60642E-03    ( -8.77849e-05   8.74199e-05 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.96     using 59 bins.
 Reduced chi-squared = 1.12211
# Null hypothesis probability of 2.45e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 361.8 sec: 0.364742 ( -0.012166  0.012207 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.67358e-06 ( -2.94839e-07  2.96344e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -51.604 sec. to  310.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49822     ( -0.259822   0.276781 )
Epeak [keV] : 70.1791      ( -13.1395 67.1912 )
Norm@50keV  : 3.89212E-03    ( -0.0010035   0.0014699 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.88     using 59 bins.
 Reduced chi-squared = 1.05143
# Null hypothesis probability of 3.71e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 361.8 sec: 0.354852 ( -0.014117  0.01419 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.36351e-06 ( -3.72375e-07  3.7341e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  173.532 sec. to  174.532 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60344     ( -0.220315   0.212681 )
Norm@50keV  : 1.17916E-02    ( -0.0015132   0.00147508 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   36.46     using 59 bins.
 Reduced chi-squared = 0.639649
# Null hypothesis probability of 9.84e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.51694 ( -0.17032  0.17037 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10245e-07 ( -1.5307e-08  1.5607e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  173.532 sec. to  174.532 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60529     ( -0.218372   0.216881 )
Epeak [keV] : 9999.22      ( -9999.35 -9999.35 )
Norm@50keV  : 1.18055E-02    ( -0.0102398   0.0083955 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   36.47     using 59 bins.
 Reduced chi-squared = 0.65125
# Null hypothesis probability of 9.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.51916 ( -0.17508  0.1696 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.94576e-08 ( -1.57804e-08  1.25606e-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 = 6.065185159620234E-01, IMY = -3.903051617941981E-02

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:
-239.000000 -51.604000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
202.7667  59.9884    2.5  40.8  -17.7   1.5997   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-51.604000 80.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
175.5618  20.4470    2.5  12.7   79.7   1.0020   4.6 ------	UNKNOWN                       
198.2840  44.5104    0.4  31.3    3.7   7.0622  27.9 ------	UNKNOWN                       
118.9701  -8.0084    1.9  57.0 -168.5   4.3799   5.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
143.100580 963.079600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5214  35.2130   42.2  43.3  -15.4  -0.3085  -0.3    8.4	Her X-1                       
189.0896  13.1473    2.8  32.3   99.3   4.4754   4.1 ------	UNKNOWN                       
206.3113  24.4028    2.7  21.2   61.6   3.1989   4.2 ------	UNKNOWN                       
231.5521  22.3752    3.9  35.1   20.5   2.9257   2.9 ------	UNKNOWN                       
129.3012  26.8724    3.1  56.9  179.2  14.1139   3.7 ------	UNKNOWN                       
198.2924  44.5135    1.0   0.1  -17.4   8.1825  11.7 ------	UNKNOWN                       
262.0989  18.4819    5.9  58.7   -3.0  10.7181   2.0 ------	UNKNOWN                       
252.6738  37.7645    3.4  40.8  -17.6   3.7089   3.4 ------	UNKNOWN                       
275.1210  41.0542    3.4  54.4  -32.9  13.6477   3.4 ------	UNKNOWN                       
113.2853  67.0510    2.4  47.9 -129.1  15.6057   4.8 ------	UNKNOWN