GRB230328B: 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 15:06:19 EDT 2023
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1162001
======================================================================

  Trigger: 01162001      Segment: 000

  BAT Trigger Time: 701708119.552   [s; MET]
      Trigger Stop: 701708120.576   [s; MET]
               UTC: 2023-03-28T14:54:48.547340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 290.985760498204   Dec: 80.0162708424252  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.77
     Image Trigger?:     NO
     Rate S/N Ratio:     53.7866154354408  [ if not an image trigger ]
     Image S/N Ratio:    17.77

  Analysis Position:   [ source = BAT ]
    RA: 290.985760498204   Dec: 80.0162708424252  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 291.034112417174   Dec: 80.0122817911935  [deg; J2000]  
        { 19h 24m 08.2s , +80d 00' 44.2" }
         +/- 0.829413160582525 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.265517025807718 [arcmin] (formal 1-sigma fit error)
    SNR: 39.7337833760157
 
  Angular difference between the analysis and refined position is 0.557096 arcmin
 
  Partial Coding Fraction: 0.46875    [ including projection effects ]

  Duration
     T90: 22.336000084877 +/- 5.71009492341089
        Measured from: -2.62400007247925
                   to: 19.7120000123978     [s; relative to TRIGTIME]
     T50: 6.78400003910065 +/- 0.687255446672283
        Measured from: 0.911999940872192
                   to: 7.69599997997284     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.259999990463257     
                   to: 1.25999999046326     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -7.37600004673004     
                   to: 31.7599999904633     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.997102   2.683602   2.039914   0.478731
           0.083863   0.088694   0.076842   0.061593 [error]
 Peak      0.206173   0.355605   0.339686   0.105158
           0.017813   0.021302   0.020469   0.013713 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   39.136   -7.376   31.760
T90    22.336   -2.624   19.712
T50     6.784    0.912    7.696
Peak    1.000    0.260    1.260
 
 
====== 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      -1.633    -0.070      0.070       -           -               -         1.26e-02     -4.91e-04          4.91e-04      37.160   57
CPL     -1.258    -0.285      0.305      102.879     -24.767       144.103      1.91e-02     -5.08e-03          7.51e-03      32.000   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      -1.251     -0.105     0.105       -           -               -         7.09e-02     -4.40e-03          4.40e-03      61.870   57
CPL     -0.913     -0.380     0.457      178.684     -72.494      -178.684      1.02e-01     -3.30e-02          6.18e-02      59.970   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   7.12e-07  1.21e-06  1.56e-06  4.04e-06  4.58e-06  7.51e-06   erg/cm2
      90%_error_low -4.95e-08 -5.04e-08 -7.81e-08 -4.28e-07 -1.88e-07 -4.85e-07   erg/cm2
      90%_error_hi   5.08e-08  5.03e-08  7.79e-08  4.60e-07  1.88e-07  5.09e-07   erg/cm2
Peak flux       PL   2.30e+00  2.68e+00  2.26e+00  3.20e+00  8.39e+00  1.04e+01   ph/cm2/s
      90%_error_low -2.66e-01 -1.96e-01 -1.61e-01 -4.54e-01 -5.40e-01 -6.69e-01   ph/cm2/s
      90%_error_hi   2.77e-01  1.94e-01  1.60e-01  4.96e-01  5.41e-01  6.73e-01   ph/cm2/s
 
Fluence        CPL   6.59e-07  1.24e-06  1.60e-06  2.44e-06  4.47e-06  5.94e-06   erg/cm2
      90%_error_low -6.19e-08 -5.78e-08 -8.57e-08 -7.28e-07 -2.09e-07 -7.53e-07   erg/cm2
      90%_error_hi   6.32e-08  5.85e-08  8.67e-08  1.12e-06  2.08e-07  1.11e-06   erg/cm2
Peak flux      CPL   2.13e+00  2.75e+00  2.35e+00  2.29e+00  8.29e+00  9.52e+00   ph/cm2/s
      90%_error_low -3.34e-01 -2.15e-01 -1.99e-01 -7.51e-01 -5.54e-01 -9.56e-01   ph/cm2/s
      90%_error_hi   3.44e-01  2.18e-01  2.02e-01  1.08e+00  5.55e-01  1.26e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  291.0341    80.0123   0.0049    37.3609  -147.3329         6.8326550     39.734 TRIG_01162001                 
 
Foreground time interval of the image:
 -7.376  16.149 (delta_t =  23.525 [sec])
Background time interval of the image:
-239.552  -7.376 (delta_t = 232.176 [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   -7.376 sec. to   31.760 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.63337     ( -0.0703932   0.0700832 )
Norm@50keV  : 1.25712E-02    ( -0.000490979   0.00049044 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   37.16     using 59 bins.
 Reduced chi-squared = 0.65193
# Null hypothesis probability of 9.81e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 39.14 sec: 1.63266 ( -0.06768  0.06786 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.5847e-06 ( -1.87861e-07  1.884e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -7.376 sec. to   31.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25771     ( -0.284774   0.304497 )
Epeak [keV] : 102.879      ( -24.7679 144.102 )
Norm@50keV  : 1.91007E-02    ( -0.00508048   0.00750722 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   32.00     using 59 bins.
 Reduced chi-squared = 0.571429
# Null hypothesis probability of 9.96e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 39.14 sec: 1.59419 ( -0.07303  0.07343 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.46901e-06 ( -2.08503e-07  2.07817e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.260 sec. to    1.260 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25132     ( -0.104965   0.105286 )
Norm@50keV  : 7.09162E-02    ( -0.00439566   0.00439563 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.87     using 59 bins.
 Reduced chi-squared = 1.08544
# Null hypothesis probability of 3.06e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 8.38933 ( -0.54009  0.54079 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.09561e-07 ( -4.78932e-08  4.80565e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.260 sec. to    1.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.912834     ( -0.379689   0.457495 )
Epeak [keV] : 178.684      ( -72.4941 -178.684 )
Norm@50keV  : 0.101884    ( -0.033   0.0618033 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.97     using 59 bins.
 Reduced chi-squared = 1.07089
# Null hypothesis probability of 3.34e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 8.28825 ( -0.55414  0.55472 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78867e-07 ( -4.77769e-08  5.45487e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 22.336 sec.
Hardness ratio (energy fluence ratio) = 1.28940699569

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

S(15-50 keV)  = 1.9184313e-06
S(50-150 keV) = 2.666295e-06

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 = -6.427102760570491E-01, IMY = 4.120911943418059E-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:
-239.552000 -7.376000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5901  35.2298    6.5   9.8   44.6   0.5653   1.8    9.4	Her X-1                       
268.2034  -1.3470    0.0  46.6   10.9  -0.6351  -1.2   11.7	SW J1753.5-0127               
288.8775  10.8997    6.3  42.4  -23.0   0.9967   1.8    5.4	GRS 1915+105                  
299.5859  35.1910    0.8  32.3  -63.7   7.9539  14.8    0.7	Cyg X-1                       
308.1640  41.0248    3.5  35.8  -78.3   2.2572   3.3    5.0	Cyg X-3                       
261.8048 -10.9570    2.7  55.5   20.4   6.7834   4.3 ------	UNKNOWN                       
161.1663  83.7326    2.8  46.7 -164.7   3.0319   4.1 ------	UNKNOWN                       
286.4519  14.7063    3.0  37.9  -23.0   1.7781   3.9 ------	UNKNOWN                       

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

Time interval of the image:
-7.376000 16.148600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5510  35.3835    3.4   9.7   45.1  -0.3439  -3.4    5.2	Her X-1                       
268.3109  -1.5285    7.8  46.8   10.8  -0.2949  -1.5    5.7	SW J1753.5-0127               
288.6815  10.8699    5.8  42.3  -22.7   0.3796   2.0    8.2	GRS 1915+105                  
299.5900  35.2014   15.0  32.3  -63.7  -0.1523  -0.8    0.0	Cyg X-1                       
308.1891  40.9408   18.7  35.9  -78.2  -0.1790  -0.6    3.6	Cyg X-3                       
213.5794  26.1148    3.1  40.6  102.5   1.2724   3.7 ------	UNKNOWN                       
252.7378  -6.0404    2.4  50.8   31.7   1.7459   4.9 ------	UNKNOWN                       
291.0341  80.0123    0.3  37.4 -147.3   6.8323  39.8 ------	UNKNOWN                       
 58.0738  79.1616    2.3  55.7 -151.5   2.5677   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
93.148590 719.636300
720.448000 871.748600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4050  35.3875    4.4  46.8   28.7   3.9284   2.6    3.7	Her X-1                       
299.5860  35.2180    0.7  44.9  -23.0  24.8150  15.7    1.0	Cyg X-1                       
308.1542  40.9328    3.1  39.6  -33.5   5.0430   3.7    2.3	Cyg X-3                       
326.2084  38.2453    6.8  43.9  -53.8   5.1135   1.7    4.9	Cyg X-2                       
248.0804  35.4345    3.0  47.6   35.7   7.8135   3.8 ------	UNKNOWN                       
274.5848  25.2223    2.8  55.2    5.1  10.1764   4.2 ------	UNKNOWN                       
274.3015  31.4931    2.7  49.0    5.9   5.7363   4.3 ------	UNKNOWN                       
 92.8796  55.0995    2.6  44.5 -178.3   8.1283   4.4 ------	UNKNOWN                       
 76.9432  51.9051    3.0  46.7 -164.6   7.5308   3.8 ------	UNKNOWN                       
 49.0029  55.1864    2.5  40.4 -141.9   8.0099   4.6 ------	UNKNOWN                       
  8.9589  50.5768    3.5  38.4 -103.3   9.9111   3.3 ------	UNKNOWN