GRB241030A: 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 Dec 18 16:31:04 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1263718
======================================================================

  Trigger: 01263718      Segment: 000

  BAT Trigger Time: 751960117.568   [s; MET]
      Trigger Stop: 751960118.08   [s; MET]
               UTC: 2024-10-30T05:48:03.124380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 343.032953716989   Dec: 80.4389595800238  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.9
     Image Trigger?:     NO
     Rate S/N Ratio:     15.1327459504216  [ if not an image trigger ]
     Image S/N Ratio:    8.9

  Analysis Position:   [ source = BAT ]
    RA: 343.032953716989   Dec: 80.4389595800238  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 343.218442091515   Dec: 80.4391555675872  [deg; J2000]  
        { 22h 52m 52.4s , +80d 26' 21.0" }
         +/- 1.12188034924964 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.408884900296224 [arcmin] (formal 1-sigma fit error)
    SNR: 25.8087029180083
 
  Angular difference between the analysis and refined position is 1.848576 arcmin
 
  Partial Coding Fraction: 0.8046875    [ including projection effects ]

  Duration
     T90: 173.431999921799 +/- 5.19071791518489
        Measured from: 18.3880000114441
                   to: 191.819999933243     [s; relative to TRIGTIME]
     T50: 45.9240000247955 +/- 1.00024000888708
        Measured from: 115.991999983788
                   to: 161.916000008583     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 147.452000021935     
                   to: 148.452000021935     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.931999921798706     
                   to: 276.496000051498     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    14.525832  17.360098  12.045477   2.671493
           0.108514   0.114482   0.099046   0.078781 [error]
 Peak      0.325341   0.527808   0.502297   0.156018
           0.010342   0.012611   0.012725   0.008789 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  277.428   -0.932  276.496
T90   173.432   18.388  191.820
T50    45.924  115.992  161.916
Peak    1.000  147.452  148.452
 
 
====== 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      -1.649    -0.027      0.027       -           -               -         1.03e-02     -1.45e-04          1.45e-04      33.480   57
CPL     -1.588    -0.082      0.111      410.240    -410.190      -410.240      1.09e-02     -7.86e-04          1.17e-03      32.560   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      -1.174     -0.051     0.051       -           -               -         9.89e-02     -2.76e-03          2.76e-03      36.990   57
CPL     -1.060     -0.150     0.199      472.468    -472.468      -472.468      1.11e-01     -1.40e-02          2.45e-02      35.970   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   4.21e-06  7.06e-06  9.01e-06  2.30e-05  2.67e-05  4.33e-05   erg/cm2
      90%_error_low -1.34e-07 -1.31e-07 -1.35e-07 -8.26e-07 -3.63e-07 -8.51e-07   erg/cm2
      90%_error_hi   1.36e-07  1.30e-07  1.35e-07  8.48e-07  3.63e-07  8.64e-07   erg/cm2
Peak flux       PL   2.98e+00  3.64e+00  3.23e+00  4.94e+00  1.16e+01  1.48e+01   ph/cm2/s
      90%_error_low -1.70e-01 -1.25e-01 -1.04e-01 -3.40e-01 -3.36e-01 -4.37e-01   ph/cm2/s
      90%_error_hi   1.74e-01  1.24e-01  1.03e-01  3.56e-01  3.37e-01  4.39e-01   ph/cm2/s
 
Fluence        CPL   4.13e-06  7.07e-06  9.06e-06  2.15e-05  2.66e-05  4.18e-05   erg/cm2
      90%_error_low -1.93e-07 -1.31e-07 -1.65e-07 -2.42e-06 -4.02e-07 -2.48e-06   erg/cm2
      90%_error_hi   1.59e-07  1.31e-07  1.65e-07  1.39e-06  4.01e-07  1.85e-06   erg/cm2
Peak flux      CPL   2.89e+00  3.66e+00  3.27e+00  4.38e+00  1.15e+01  1.42e+01   ph/cm2/s
      90%_error_low -2.21e-01 -1.30e-01 -1.20e-01 -7.98e-01 -3.56e-01 -8.96e-01   ph/cm2/s
      90%_error_hi   2.20e-01  1.30e-01  1.25e-01  7.24e-01  3.56e-01  8.13e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  343.2184    80.4392   0.0074    17.5328   -66.3106         1.2367011     25.809 TRIG_01263718                 
 
Foreground time interval of the image:
 -0.932  10.333 (delta_t =  11.265 [sec])
Background time interval of the image:
-267.568  -0.932 (delta_t = 266.636 [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   -0.932 sec. to  276.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64886     ( -0.0271686   0.0272164 )
Norm@50keV  : 1.03318E-02    ( -0.000145203   0.000145014 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   33.48     using 59 bins.
 Reduced chi-squared = 0.587368
# Null hypothesis probability of 9.95e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 277.4 sec: 1.34862 ( -0.02476  0.0249 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.66622e-05 ( -3.63386e-07  3.63452e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.932 sec. to  276.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.5878     ( -0.0822262   0.110561 )
Epeak [keV] : 410.240      ( -410.158 -410.208 )
Norm@50keV  : 1.09440E-02    ( -0.000785628   0.00117009 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   32.56     using 59 bins.
 Reduced chi-squared = 0.581429
# Null hypothesis probability of 9.95e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 277.4 sec: 1.33891 ( -0.0297  0.02998 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.65611e-05 ( -4.02416e-07  4.01137e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  147.452 sec. to  148.452 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17356     ( -0.0512699   0.0513394 )
Norm@50keV  : 9.89448E-02    ( -0.00276192   0.00276142 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   36.99     using 59 bins.
 Reduced chi-squared = 0.648947
# Null hypothesis probability of 9.82e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 11.5728 ( -0.3363  0.3366 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.0116e-06 ( -3.11849e-08  3.12456e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  147.452 sec. to  148.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.05993     ( -0.149886   0.199282 )
Epeak [keV] : 472.468      ( -472.469 -472.469 )
Norm@50keV  : 0.111206    ( -0.0139607   0.0244851 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   35.97     using 59 bins.
 Reduced chi-squared = 0.642321
# Null hypothesis probability of 9.83e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 11.5010 ( -0.356  0.3563 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00543e-06 ( -3.30635e-08  3.2911e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 173.432 sec.
Hardness ratio (energy fluence ratio) = 1.27558645417

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

S(15-50 keV)  = 1.1271835e-05
S(50-150 keV) = 1.539023e-05

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 = 1.269330432213816E-01, IMY = 2.893066313359380E-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:
-267.568000 -0.932000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5932  35.1971    1.4  48.7 -146.7   8.2391   8.0    0.3	Cyg X-1                       
307.9422  41.0560   16.9  40.2 -149.9   0.4258   0.7    9.8	Cyg X-3                       
326.0236  38.3640    4.6  34.9 -171.5   1.2393   2.5    7.4	Cyg X-2                       
 23.5824  32.5725    2.9  33.3   99.0   2.5902   4.1 ------	UNKNOWN                       
 77.8453  62.6360    2.7  30.4    5.6   1.9947   4.2 ------	UNKNOWN                       
260.7996  66.0201    2.8  39.3  -92.0   6.5040   4.2 ------	UNKNOWN                       
286.0358  43.0241    2.8  48.1 -129.2   7.7560   4.1 ------	UNKNOWN                       

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

Time interval of the image:
-0.932000 10.332600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.7418  35.1307    6.4  48.7 -146.9  -0.1932  -1.8    8.6	Cyg X-1                       
307.9435  40.9978   12.3  40.3 -149.9   0.0625   0.9    8.0	Cyg X-3                       
326.3389  38.3215    5.6  34.9 -171.9   0.1038   2.1    7.9	Cyg X-2                       
 83.4865  48.5496    2.5  42.4   19.3   0.3326   4.7 ------	UNKNOWN                       
343.2185  80.4391    0.4  17.5  -66.3   1.2365  25.8 ------	UNKNOWN                       
313.6625  54.9500    2.1  27.3 -138.2   0.2547   5.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
61.932600 934.932600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6170  35.1882    1.6  48.2 -166.7  21.2273   7.1    1.5	Cyg X-1                       
308.0945  40.9868    4.0  41.5 -174.8   6.0998   2.9    2.2	Cyg X-3                       
326.2735  38.4258   83.7  42.5  164.0   0.3880   0.1    7.9	Cyg X-2                       
 61.0207  79.2330    2.6  12.8   20.1   4.5941   4.3 ------	UNKNOWN                       
343.1523  80.4568    0.3   0.0   -4.7  41.5995  33.8 ------	UNKNOWN                       
189.7828  53.0659    2.9  45.6  -57.8  23.3994   3.9 ------	UNKNOWN