GRB220306B: 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 23:37:07 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1095288
======================================================================

  Trigger: 01095288      Segment: 000

  BAT Trigger Time: 668283366.208   [s; MET]
      Trigger Stop: 668283366.72   [s; MET]
               UTC: 2022-03-06T18:15:37.473400    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 5.3780511855963   Dec: 71.3538978453536  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.05
     Image Trigger?:     NO
     Rate S/N Ratio:     22.781571499789  [ if not an image trigger ]
     Image S/N Ratio:    12.05

  Analysis Position:   [ source = BAT ]
    RA: 5.3780511855963   Dec: 71.3538978453536  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 5.38011331226045   Dec: 71.3845960963915  [deg; J2000]  
        { 00h 21m 31.2s , +71d 23' 04.5" }
         +/- 1.55469563082041 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.71453921867971 [arcmin] (formal 1-sigma fit error)
    SNR: 16.1934456676201
 
  Angular difference between the analysis and refined position is 1.842319 arcmin
 
  Partial Coding Fraction: 0.7890625    [ including projection effects ]

  Duration
     T90: 12.336000084877 +/- 3.2357997965706
        Measured from: -1.57599997520447
                   to: 10.7600001096725     [s; relative to TRIGTIME]
     T50: 3.44000005722046 +/- 2.58453242800887
        Measured from: -0.135999917984009
                   to: 3.30400013923645     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0519999265670776     
                   to: 0.948000073432922     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.81599998474121     
                   to: 11.6560000181198     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.234598   0.307899   0.284476   0.076059
           0.033152   0.034710   0.031005   0.027056 [error]
 Peak      0.067023   0.099426   0.098921   0.038587
           0.010079   0.011097   0.010301   0.008005 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.472   -1.816   11.656
T90    12.336   -1.576   10.760
T50     3.440   -0.136    3.304
Peak    1.000   -0.052    0.948
 
 
====== 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      -1.301    -0.199      0.200       -           -               -         4.49e-03     -4.94e-04          4.93e-04      69.320   57
CPL     -1.262    -0.239      0.600      984.457    -984.457      -984.457      4.70e-03     -6.86e-04          3.02e-04      69.400   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      -1.187     -0.184     0.186       -           -               -         2.00e-02     -2.11e-03          2.11e-03      56.320   57
CPL     -1.014     -0.339     0.809      309.735    -309.735      -309.735      2.42e-02     -8.94e-03          3.25e-02      56.150   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   6.41e-08  1.33e-07  2.16e-07  7.87e-07  5.97e-07  1.20e-06   erg/cm2
      90%_error_low -1.26e-08 -1.60e-08 -3.05e-08 -2.21e-07 -7.46e-08 -2.45e-07   erg/cm2
      90%_error_hi   1.33e-08  1.58e-08  3.01e-08  2.76e-07  7.54e-08  2.92e-07   erg/cm2
Peak flux       PL   6.10e-01  7.41e-01  6.51e-01  9.82e-01  2.35e+00  2.98e+00   ph/cm2/s
      90%_error_low -1.19e-01 -9.09e-02 -8.17e-02 -2.39e-01 -2.52e-01 -3.38e-01   ph/cm2/s
      90%_error_hi   1.26e-01  8.95e-02  8.07e-02  2.83e-01  2.52e-01  3.46e-01   ph/cm2/s
 
Fluence        CPL   6.46e-08  1.31e-07  2.14e-07  8.22e-07  6.03e-07  1.19e-06   erg/cm2
      90%_error_low    N/A    -1.91e-08 -3.98e-08    N/A    -1.07e-07 -4.73e-07   erg/cm2
      90%_error_hi     N/A     2.46e-08  4.34e-08    N/A     7.38e-08  1.39e-07   erg/cm2
Peak flux      CPL   5.88e-01  7.51e-01  6.64e-01  8.08e-01  2.33e+00  2.81e+00   ph/cm2/s
      90%_error_low -1.50e-01 -9.64e-02 -9.16e-02 -4.30e-01 -2.60e-01 -5.21e-01   ph/cm2/s
      90%_error_hi   1.43e-01  1.02e-01  9.84e-02  2.09e-01  2.59e-01  4.87e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    5.3801    71.3846   0.0119    18.2925   124.7735         1.0419499     16.193 TRIG_01095288                 
 
Foreground time interval of the image:
 -1.816  11.656 (delta_t =  13.472 [sec])
Background time interval of the image:
-232.507  -1.816 (delta_t = 230.691 [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   -1.816 sec. to   11.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30133     ( -0.198993   0.200356 )
Norm@50keV  : 4.48879E-03    ( -0.000493797   0.000492733 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.32     using 59 bins.
 Reduced chi-squared = 1.21614
# Null hypothesis probability of 1.27e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 13.47 sec: 0.535662 ( -0.059559  0.05966 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.97376e-07 ( -7.45612e-08  7.53804e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -1.816 sec. to   11.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29782     ( -0.238405   0.600457 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 4.50740E-03    ( -0.000496706   0.000491106 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.32     using 59 bins.
 Reduced chi-squared = 1.23786
# Null hypothesis probability of 1.09e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 13.47 sec: 0.538714 ( -0.078657  0.072283 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.02805e-07 ( -1.06684e-07  7.37877e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.052 sec. to    0.948 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.18657     ( -0.184056   0.185605 )
Norm@50keV  : 2.00161E-02    ( -0.00211317   0.00211225 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.32     using 59 bins.
 Reduced chi-squared = 0.98807
# Null hypothesis probability of 5.01e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.34514 ( -0.25174  0.25209 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.03873e-07 ( -2.43459e-08  2.45396e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.052 sec. to    0.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01396     ( -0.338782   0.808795 )
Epeak [keV] : 309.735      ( -309.734 -309.734 )
Norm@50keV  : 2.41819E-02    ( -0.00893565   0.0324906 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.15     using 59 bins.
 Reduced chi-squared = 1.00268
# Null hypothesis probability of 4.69e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.33005 ( -0.25977  0.25923 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.01865e-07 ( -2.6105e-08  2.54248e-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 = -1.885367209634014E-01, IMY = -2.715366784012588E-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:
-232.507400 -1.816000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5890  35.1984    0.6  33.4  -18.7   8.2840  19.8    0.2	Cyg X-1                       
308.0707  40.9556    4.2  24.8  -22.2   0.9884   2.7    1.8	Cyg X-3                       
326.2978  38.4956    0.0  20.1  -58.0   0.1684   0.4   12.0	Cyg X-2                       
173.5864  82.0627    2.5  40.4   92.8   5.7883   4.6 ------	UNKNOWN                       
245.4231  52.1944    2.2  49.2   42.1   6.8454   5.2 ------	UNKNOWN                       
290.8798  67.6654    3.1  23.1   51.7   1.3802   3.8 ------	UNKNOWN                       
308.0113  37.6772    1.9  27.5  -26.6   2.3220   6.2 ------	UNKNOWN                       
  7.5825  27.8744    2.9  36.3 -132.7   2.3250   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-1.816000 11.656000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.3888  35.1740    7.3  33.6  -18.5  -0.1255  -1.6   10.0	Cyg X-1                       
307.9904  40.8150    9.2  25.0  -22.3  -0.0772  -1.2    9.9	Cyg X-3                       
326.3777  38.2786    5.7  20.3  -58.4   0.1281   2.0   10.0	Cyg X-2                       
  5.3801  71.3846    0.7  18.3  124.8   1.0418  16.2 ------	UNKNOWN                       
 49.2576  26.4593    2.1  58.3 -174.3   1.8250   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
68.892600 962.922000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5694  35.2032    1.4  49.2  -28.4  25.6398   8.2    1.0	Cyg X-1                       
308.0969  40.9533   16.0  41.3  -33.9   1.4070   0.7    0.6	Cyg X-3                       
326.0756  38.1671    0.0  38.7  -55.5  -0.7879  -0.4   10.3	Cyg X-2                       
134.3752  71.5634    3.0  33.4   98.3   5.9224   3.8 ------	UNKNOWN                       
 69.9009  26.2280    2.3  57.2  177.2  26.0838   4.9 ------	UNKNOWN                       
 65.0519  39.8252    3.1  43.1  175.5   6.8616   3.8 ------	UNKNOWN                       
 33.5127  39.9383    3.8  34.5 -148.0   3.9416   3.1 ------	UNKNOWN