GRB230414B: 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 15:02:18 EDT 2023
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1164180
======================================================================

  Trigger: 01164180      Segment: 000

  BAT Trigger Time: 703181692.352   [s; MET]
      Trigger Stop: 703181700.544   [s; MET]
               UTC: 2023-04-14T16:14:21.246980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 181.071398844   Dec: 53.1268747077817  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.77
     Image Trigger?:     NO
     Rate S/N Ratio:     11.4891252930761  [ if not an image trigger ]
     Image S/N Ratio:    7.77

  Analysis Position:   [ source = BAT ]
    RA: 181.071398844   Dec: 53.1268747077817  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 181.027130344276   Dec: 53.1921010010707  [deg; J2000]  
        { 12h 04m 06.5s , +53d 11' 31.6" }
         +/- 2.46760884578931 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.27389067923357 [arcmin] (formal 1-sigma fit error)
    SNR: 8.36996495081363
 
  Angular difference between the analysis and refined position is 4.225208 arcmin
 
  Partial Coding Fraction: 0.8046875    [ including projection effects ]

  Duration
     T90: 29.0599999427795 +/- 7.74073911085516
        Measured from: -0.0679999589920044
                   to: 28.9919999837875     [s; relative to TRIGTIME]
     T50: 12.539999961853 +/- 8.64171837297098
        Measured from: 2.67999994754791
                   to: 15.2199999094009     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 9.30400002002716     
                   to: 10.3040000200272     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.519999980926514     
                   to: 35.2239999771118     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.215802   0.368472   0.166028   0.070017
           0.051725   0.053556   0.045742   0.038748 [error]
 Peak      0.035608   0.025856   0.013699   0.008081
           0.008796   0.009297   0.007896   0.006912 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   35.744   -0.520   35.224
T90    29.060   -0.068   28.992
T50    12.540    2.680   15.220
Peak    1.000    9.304   10.304
 
 
====== 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      -1.604    -0.341      0.333       -           -               -         1.41e-03     -2.98e-04          2.90e-04      67.160   57
CPL     -1.543    -1.130      1.566      312.809    -312.809      -312.809      1.54e-03     -4.18e-04          1.39e-02      67.190   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      -2.264     -0.633     0.468       -           -               -         3.70e-03     -1.70e-03          1.64e-03      56.950   57
CPL      0.033     -2.037     4.492       34.306     -34.306        18.365      9.43e-02     -9.43e-02          1.66e+02      53.690   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   7.11e-08  1.23e-07  1.61e-07  4.32e-07  4.72e-07  7.87e-07   erg/cm2
      90%_error_low -2.04e-08 -2.35e-08 -4.46e-08 -2.02e-07 -1.05e-07 -2.52e-07   erg/cm2
      90%_error_hi   2.14e-08  2.34e-08  4.50e-08  3.01e-07  1.08e-07  3.33e-07   erg/cm2
Peak flux       PL   3.19e-01  2.05e-01  8.50e-02  4.80e-02  6.33e-01  6.57e-01   ph/cm2/s
      90%_error_low -1.15e-01 -7.08e-02 -4.56e-02 -4.80e-02 -2.04e-01 -2.14e-01   ph/cm2/s
      90%_error_hi   1.20e-01  6.94e-02  5.01e-02  5.99e-02  2.04e-01  2.17e-01   ph/cm2/s
 
Fluence        CPL   7.13e-08  1.22e-07  1.61e-07  4.44e-07  4.74e-07  7.27e-07   erg/cm2
      90%_error_low -2.09e-08 -2.27e-08 -4.86e-08 -2.94e-07 -1.35e-07 -3.80e-07   erg/cm2
      90%_error_hi   2.04e-08  2.49e-08  4.54e-08  1.38e-07  8.48e-08  3.77e-07   erg/cm2
Peak flux      CPL   2.86e-01  2.78e-01  7.95e-02  4.46e-03  6.49e-01  6.48e-01   ph/cm2/s
      90%_error_low -1.32e-01 -9.97e-02 -7.95e-02 -4.46e-03 -1.98e-01 -1.97e-01   ph/cm2/s
      90%_error_hi   1.32e-01  1.06e-01  7.11e-02  4.59e-02  2.01e-01  2.03e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  181.0271    53.1921   0.0229    20.4094   130.6616         0.8835266      8.370 TRIG_01164180                 
 
Foreground time interval of the image:
 -0.520  35.224 (delta_t =  35.744 [sec])
Background time interval of the image:
-239.352  -0.520 (delta_t = 238.832 [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   -0.520 sec. to   35.224 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60371     ( -0.340591   0.333233 )
Norm@50keV  : 1.41373E-03    ( -0.000298027   0.000290366 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.16     using 59 bins.
 Reduced chi-squared = 1.17825
# Null hypothesis probability of 1.68e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 35.74 sec: 0.181886 ( -0.034614  0.034627 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.72383e-07 ( -1.05274e-07  1.08308e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.520 sec. to   35.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60199     ( -1.11981   1.57673 )
Epeak [keV] : 9998.81      ( -9999.18 -9999.18 )
Norm@50keV  : 1.41703E-03    ( -0.000300072   0.0139895 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.16     using 59 bins.
 Reduced chi-squared = 1.19929
# Null hypothesis probability of 1.46e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 35.74 sec: 0.181945 ( -0.034777  0.034569 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.73626e-07 ( -1.35379e-07  8.47724e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    9.304 sec. to   10.304 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.26395     ( -0.6252   0.476328 )
Norm@50keV  : 3.69730E-03    ( -0.00168637   0.00165098 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.95     using 59 bins.
 Reduced chi-squared = 0.999123
# Null hypothesis probability of 4.77e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.633270 ( -0.203646  0.204315 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.50332e-08 ( -1.33776e-08  1.42433e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    9.304 sec. to   10.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.033365     ( -2.02906   4.50003 )
Epeak [keV] : 34.3059      ( -34.3409 18.3305 )
Norm@50keV  : 9.42711E-02    ( -0.0941262   166.324 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.69     using 59 bins.
 Reduced chi-squared = 0.95875
# Null hypothesis probability of 5.63e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.648766 ( -0.198458  0.200815 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 29.06 sec.
Hardness ratio (energy fluence ratio) = 1.31616384037

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

S(15-50 keV)  = 1.9377886e-07
S(50-150 keV) = 2.786064e-07

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 = -2.424463437888354E-01, IMY = -2.822522106552625E-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:
-239.352000 -0.520000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4565  35.3494    4.1  42.2   17.6   1.3375   2.8    0.4	Her X-1                       
204.3499  37.8068    2.4  31.6   84.7   3.2460   4.7 ------	UNKNOWN                       
215.6170  59.7869    2.7  10.0   57.1   1.5057   4.3 ------	UNKNOWN                       
282.4145  37.3379    2.5  49.9  -12.1   2.9838   4.6 ------	UNKNOWN                       
251.3616  84.0397    2.3  16.8  -87.0   2.1626   4.9 ------	UNKNOWN                       
291.4232  44.2870    2.7  46.9  -24.4   3.0628   4.3 ------	UNKNOWN                       
 32.5872  72.1868    3.4  38.5 -103.3   4.3240   3.4 ------	UNKNOWN                       
 79.4618  54.1716    2.6  51.0 -137.1   8.0364   4.4 ------	UNKNOWN                       
335.9958  63.0035    2.9  42.7  -69.2   5.7650   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-0.520000 35.224000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4728  35.2907   10.5  42.3   17.6   0.1754   1.1    3.2	Her X-1                       
154.9408  30.0857    2.3  49.3  145.0   2.0783   4.9 ------	UNKNOWN                       
181.0271  53.1921    1.4  20.4  130.7   0.8837   8.4 ------	UNKNOWN                       
291.5811  49.6258    2.3  42.3  -28.4   0.7708   5.1 ------	UNKNOWN                       
314.7229  63.2811    2.3  37.8  -56.5   0.9214   5.0 ------	UNKNOWN                       
 65.8581  63.6389    2.0  44.5 -124.0   2.1315   5.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
111.148630 962.768000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4665  35.2940    3.6  53.0   12.2   6.7177   3.2    2.9	Her X-1                       
234.2373  22.6373    2.9  50.2   39.8  12.1938   4.0 ------	UNKNOWN                       
197.2696  24.0234    2.8  31.6   84.7   8.9850   4.1 ------	UNKNOWN                       
193.4065  46.9192    2.6  10.0   57.1   5.1528   4.5 ------	UNKNOWN                       
 67.0887  81.0806    3.8  41.2  -78.7  13.7538   3.1 ------	UNKNOWN