GRB241030B: 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 16:29:12 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1263840
======================================================================

  Trigger: 01263840      Segment: 000

  BAT Trigger Time: 752006095.36   [s; MET]
      Trigger Stop: 752006097.408   [s; MET]
               UTC: 2024-10-30T18:34:20.913240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 50.7882858108845   Dec: 34.4325795095614  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.43
     Image Trigger?:     NO
     Rate S/N Ratio:     28.3196045170126  [ if not an image trigger ]
     Image S/N Ratio:    9.43

  Analysis Position:   [ source = BAT ]
    RA: 50.7882858108845   Dec: 34.4325795095614  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 50.7834928081352   Dec: 34.4372648060482  [deg; J2000]  
        { 03h 23m 08.0s , +34d 26' 14.2" }
         +/- 1.70467810394395 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.523980812279615 [arcmin] (formal 1-sigma fit error)
    SNR: 14.1971342877119
 
  Angular difference between the analysis and refined position is 0.367811 arcmin
 
  Partial Coding Fraction: 0.1123047    [ including projection effects ]

  Duration
     T90: 6.62399995326996 +/- 1.54505652265642
        Measured from: -0.863999962806702
                   to: 5.75999999046326     [s; relative to TRIGTIME]
     T50: 2.62399995326996 +/- 0.581748977247138
        Measured from: 0.368000030517578
                   to: 2.99199998378754     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.675999999046326     
                   to: 1.67599999904633     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.18400001525879     
                   to: 7.10399997234344     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.334934   0.692123   0.545804   0.161125
           0.053395   0.059274   0.053090   0.040309 [error]
 Peak      0.077619   0.140177   0.144386   0.042121
           0.021517   0.024421   0.024334   0.017798 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    8.288   -1.184    7.104
T90     6.624   -0.864    5.760
T50     2.624    0.368    2.992
Peak    1.000    0.676    1.676
 
 
====== 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      -1.391    -0.159      0.159       -           -               -         1.45e-02     -1.42e-03          1.42e-03      61.450   57
CPL     -0.593    -0.655      0.774       92.707     -23.896       161.833      3.55e-02     -1.82e-02          4.75e-02      56.990   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      -1.221     -0.269     0.279       -           -               -         2.70e-02     -4.74e-03          4.72e-03      61.160   57
CPL     -0.539     -0.883     1.542      121.661     -50.377      -121.661      5.58e-02     -3.24e-02          2.11e-01      60.260   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   1.39e-07  2.72e-07  4.15e-07  1.38e-06  1.16e-06  2.21e-06   erg/cm2
      90%_error_low -2.29e-08 -2.90e-08 -4.98e-08 -3.20e-07 -1.24e-07 -3.62e-07   erg/cm2
      90%_error_hi   2.40e-08  2.88e-08  4.93e-08  3.76e-07  1.24e-07  4.06e-07   erg/cm2
Peak flux       PL   8.51e-01  1.01e+00  8.68e-01  1.27e+00  3.18e+00  4.00e+00   ph/cm2/s
      90%_error_low -2.67e-01 -2.17e-01 -1.62e-01 -4.18e-01 -5.88e-01 -6.98e-01   ph/cm2/s
      90%_error_hi   2.95e-01  2.12e-01  1.60e-01  5.14e-01  5.91e-01  7.00e-01   ph/cm2/s
 
Fluence        CPL   1.19e-07  2.95e-07  4.46e-07  5.28e-07  1.12e-06  1.39e-06   erg/cm2
      90%_error_low -2.71e-08 -3.50e-08 -5.76e-08 -2.71e-07 -1.32e-07 -2.97e-07   erg/cm2
      90%_error_hi   2.82e-08  3.63e-08  5.89e-08  6.13e-07  1.31e-07  6.04e-07   erg/cm2
Peak flux      CPL   7.28e-01  1.07e+00  9.57e-01  7.18e-01  3.15e+00  3.47e+00   ph/cm2/s
      90%_error_low -3.22e-01 -2.44e-01 -2.19e-01 -4.41e-01 -5.89e-01 -7.62e-01   ph/cm2/s
      90%_error_hi   3.60e-01  2.55e-01  2.33e-01  7.20e-01  5.93e-01  9.25e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   50.7835    34.4373   0.0136    38.6948    70.7101         1.7676041     14.197 TRIG_01263840                 
 
Foreground time interval of the image:
 -1.184   7.104 (delta_t =   8.288 [sec])
Background time interval of the image:
-103.659  -1.184 (delta_t = 102.475 [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   -1.184 sec. to    7.104 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39076     ( -0.159372   0.159035 )
Norm@50keV  : 1.45045E-02    ( -0.00142504   0.00142379 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.45     using 59 bins.
 Reduced chi-squared = 1.07807
# Null hypothesis probability of 3.20e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 8.288 sec: 1.76275 ( -0.17785  0.17818 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16394e-06 ( -1.23783e-07  1.24396e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -1.184 sec. to    7.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.592813     ( -0.654861   0.77393 )
Epeak [keV] : 92.7070      ( -23.8957 161.833 )
Norm@50keV  : 3.55077E-02    ( -0.0181621   0.0475297 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.99     using 59 bins.
 Reduced chi-squared = 1.01768
# Null hypothesis probability of 4.38e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 8.288 sec: 1.71660 ( -0.18195  0.1822 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11975e-06 ( -1.32039e-07  1.31487e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.676 sec. to    1.676 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22075     ( -0.269253   0.279129 )
Norm@50keV  : 2.69956E-02    ( -0.00473818   0.00471965 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.16     using 59 bins.
 Reduced chi-squared = 1.07298
# Null hypothesis probability of 3.29e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.17831 ( -0.5879  0.59057 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.72333e-07 ( -4.88523e-08  4.88999e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.676 sec. to    1.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.539131     ( -0.883301   1.54241 )
Epeak [keV] : 121.661      ( -50.3756 -121.659 )
Norm@50keV  : 5.57994E-02    ( -0.0324293   0.211027 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.26     using 59 bins.
 Reduced chi-squared = 1.07607
# Null hypothesis probability of 3.24e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.14581 ( -0.58878  0.59275 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.69967e-07 ( -5.03732e-08  4.97679e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 6.624 sec.
Hardness ratio (energy fluence ratio) = 1.52549234385

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

S(15-50 keV)  = 4.108151e-07
S(50-150 keV) = 7.531291e-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 = 2.646090096228398E-01, IMY = -7.560338609049904E-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:
-103.659400 -1.184000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.2082  41.0839    5.7  39.2 -130.2   0.5200   2.0    9.0	Cyg X-3                       
326.3480  38.3960    6.4  32.2 -151.5   0.3362   1.8    9.4	Cyg X-2                       
 48.8472  31.8319    2.6  39.9   75.2   2.6794   4.5 ------	UNKNOWN                       
334.6646  12.9015    3.1  51.6 -179.5   1.5681   3.8 ------	UNKNOWN                       
345.8353  57.4136    2.7  10.2 -130.6   0.5697   4.2 ------	UNKNOWN                       
317.2918  75.2638    3.4  23.3  -67.0   0.5640   3.4 ------	UNKNOWN                       
307.2162  35.2583    2.2  44.1 -135.0   1.7807   5.3 ------	UNKNOWN                       
304.2786  27.8861    2.5  51.5 -138.2   2.9903   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-1.184000 7.104000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
307.9116  40.9868   41.1  39.4 -130.0  -0.0151  -0.3    9.2	Cyg X-3                       
326.1719  38.3209   32.7  32.3 -151.4   0.0134   0.4    0.0	Cyg X-2                       
 50.7835  34.4373    0.8  38.7   70.7   1.7672  14.1 ------	UNKNOWN                       
316.2656  34.8379    2.1  39.9 -144.2   0.2707   5.4 ------	UNKNOWN                       
307.5956  49.8217    2.4  33.5 -118.9   0.2328   4.9 ------	UNKNOWN                       
297.6281  43.3978    2.5  42.9 -119.1   0.5431   4.6 ------	UNKNOWN                       
306.7147  23.4925    2.2  54.0 -143.6   0.8750   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
139.140600 917.040600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6328  22.0055    0.4  31.3  -23.2  31.2467  30.7    0.5	Crab                          
 85.0053  -5.8547    3.0  51.6    6.6   6.0627   3.8 ------	UNKNOWN                       
 92.7214   9.9839    2.9  45.4  -15.5   6.3507   4.1 ------	UNKNOWN                       
331.9538  58.1429    2.5  55.6 -166.7  14.6716   4.7 ------	UNKNOWN                       
102.1422  55.6162    2.7  40.8  -85.4  16.9473   4.3 ------	UNKNOWN