GRB211023B: 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: Mon Oct 24 00:24:28 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1080859
======================================================================

  Trigger: 01080859      Segment: 000

  BAT Trigger Time: 656715980.096   [s; MET]
      Trigger Stop: 656715981.12   [s; MET]
               UTC: 2021-10-23T21:05:52.141400    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 170.3019869197   Dec: 39.1371095016785  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.67
     Image Trigger?:     NO
     Rate S/N Ratio:     12.4498995979887  [ if not an image trigger ]
     Image S/N Ratio:    9.67

  Analysis Position:   [ source = BAT ]
    RA: 170.3019869197   Dec: 39.1371095016785  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 170.318614989687   Dec: 39.1343486420401  [deg; J2000]  
        { 11h 21m 16.5s , +39d 08' 03.7" }
         +/- 1.94217974123318 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.11420936953839 [arcmin] (formal 1-sigma fit error)
    SNR: 11.7835555046331
 
  Angular difference between the analysis and refined position is 0.791388 arcmin
 
  Partial Coding Fraction: 0.4882812    [ including projection effects ]

  Duration
     T90: 1.29999995231628 +/- 0.265601194604809
        Measured from: 0.0600000619888306
                   to: 1.36000001430511     [s; relative to TRIGTIME]
     T50: 0.659999966621399 +/- 0.18070967842618
        Measured from: 0.379999995231628
                   to: 1.03999996185303     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.24400007724762     
                   to: 1.24400007724762     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0119999647140503     
                   to: 1.45200002193451     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.097766   0.124517   0.058621   0.011630
           0.013685   0.014560   0.012216   0.009386 [error]
 Peak      0.069063   0.110637   0.046207   0.010650
           0.011281   0.012271   0.010199   0.007767 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    1.464   -0.012    1.452
T90     1.300    0.060    1.360
T50     0.660    0.380    1.040
Peak    1.000    0.244    1.244
 
 
====== 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      -1.993    -0.262      0.244       -           -               -         1.25e-02     -2.14e-03          2.07e-03      49.550   57
CPL     -1.982    -0.246      1.110       64.171     -62.910       -64.171      1.27e-02     -7.71e-03          4.36e-02      49.550   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      -1.951     -0.258     0.241       -           -               -         1.52e-02     -2.57e-03          2.49e-03      52.610   57
CPL     -1.667     -0.512     1.262       50.934     -50.865       -50.934      2.20e-02     -1.20e-02          9.96e-02      52.360   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   3.72e-08  5.07e-08  5.09e-08  9.26e-08  1.69e-07  2.31e-07   erg/cm2
      90%_error_low -7.26e-09 -7.02e-09 -1.15e-08 -3.59e-08 -2.69e-08 -5.03e-08   erg/cm2
      90%_error_hi   7.48e-09  7.01e-09  1.16e-08  4.76e-08  2.73e-08  5.86e-08   erg/cm2
Peak flux       PL   9.64e-01  7.44e-01  3.85e-01  2.87e-01  2.23e+00  2.38e+00   ph/cm2/s
      90%_error_low -1.95e-01 -1.05e-01 -8.33e-02 -1.04e-01 -3.17e-01 -3.36e-01   ph/cm2/s
      90%_error_hi   2.02e-01  1.05e-01  8.32e-02  1.32e-01  3.17e-01  3.36e-01   ph/cm2/s
 
Fluence        CPL   3.71e-08  5.09e-08  5.09e-08  8.73e-08  1.68e-07  2.26e-07   erg/cm2
      90%_error_low -7.77e-09 -1.24e-08 -1.09e-08 -7.24e-08 -3.04e-08 -8.15e-08   erg/cm2
      90%_error_hi   7.90e-09  9.87e-09  1.18e-08  1.15e-07  2.76e-08  6.00e-08   erg/cm2
Peak flux      CPL   9.39e-01  7.73e-01  3.88e-01  1.94e-01  2.21e+00  2.29e+00   ph/cm2/s
      90%_error_low -2.15e-01 -1.28e-01 -7.90e-02 -1.94e-01 -3.21e-01 -3.69e-01   ph/cm2/s
      90%_error_hi   2.12e-01  1.52e-01  8.88e-02  1.25e-01  3.20e-01  4.11e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  170.3186    39.1343   0.0163    41.9099  -162.4949         0.2943256     11.784 TRIG_01080859                 
 
Foreground time interval of the image:
 -0.012   1.452 (delta_t =   1.464 [sec])
Background time interval of the image:
-239.096  -0.012 (delta_t = 239.084 [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   -0.012 sec. to    1.452 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.99344     ( -0.262283   0.244405 )
Norm@50keV  : 1.24896E-02    ( -0.00213603   0.00206606 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.55     using 59 bins.
 Reduced chi-squared = 0.869298
# Null hypothesis probability of 7.48e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1.464 sec: 1.86795 ( -0.26064  0.26077 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.68594e-07 ( -2.69395e-08  2.73267e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.012 sec. to    1.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98198     ( -0.254876   1.10201 )
Epeak [keV] : 64.1709      ( -52.3872 -53.6476 )
Norm@50keV  : 1.26867E-02    ( -0.00801636   0.043286 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.55     using 59 bins.
 Reduced chi-squared = 0.884821
# Null hypothesis probability of 7.16e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1.464 sec: 1.86662 ( -0.26364  0.26318 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.68164e-07 ( -3.0414e-08  2.75679e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.244 sec. to    1.244 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.9506     ( -0.257596   0.241214 )
Norm@50keV  : 1.51730E-02    ( -0.00256514   0.00249103 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.61     using 59 bins.
 Reduced chi-squared = 0.922982
# Null hypothesis probability of 6.40e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.22593 ( -0.31657  0.31677 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.39659e-07 ( -2.25015e-08  2.27986e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.244 sec. to    1.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66722     ( -0.511996   1.26168 )
Epeak [keV] : 50.9341      ( -50.8416 -50.9108 )
Norm@50keV  : 2.20452E-02    ( -0.0120185   0.0995767 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.36     using 59 bins.
 Reduced chi-squared = 0.935
# Null hypothesis probability of 6.13e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.21203 ( -0.32063  0.32031 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.36518e-07 ( -2.56235e-08  2.47432e-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 = -8.559957113769353E-01, IMY = 2.699789472553979E-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:
-239.096000 -0.012000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5544 -40.5738    2.9  44.3    7.6   1.8169   3.9    1.6	Vela X-1                      
119.2150  -7.8218    2.7  31.5   64.4   1.5986   4.3 ------	UNKNOWN                       
161.2801 -33.6724    3.2  37.4  -23.9   1.2850   3.6 ------	UNKNOWN                       
159.7279 -53.6995    2.8  56.3  -14.7   3.4506   4.1 ------	UNKNOWN                       
180.2194  17.2289    2.6  34.1 -125.9   1.7838   4.5 ------	UNKNOWN                       
185.1550 -26.6019    2.3  44.9  -55.3   4.6842   5.0 ------	UNKNOWN                       

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

Time interval of the image:
-0.012000 1.452000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5350 -40.5241    7.1  44.2    7.7   0.0461   1.6    1.9	Vela X-1                      
170.3188  39.1344    1.0  41.9 -162.5   0.2942  11.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
79.004600 962.967500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
138.7786  -0.7184    3.5  49.2   -2.8   4.3016   3.3 ------	UNKNOWN                       
197.9379  25.2200    2.9  27.1 -113.8   3.7735   4.0 ------	UNKNOWN                       
200.7377  19.7643    3.3  32.6 -108.8   4.4654   3.5 ------	UNKNOWN                       
202.1651   9.2723    3.6  41.3  -98.7  12.6428   3.2 ------	UNKNOWN