GRB241213A: 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: Thu Jun 19 22:09:24 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1274039
======================================================================

  Trigger: 01274039      Segment: 000

  BAT Trigger Time: 755749174.848   [s; MET]
      Trigger Stop: 755749175.872   [s; MET]
               UTC: 2024-12-13T02:19:00.145500    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 116.147921531733   Dec: 35.280440225944  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.83
     Image Trigger?:     NO
     Rate S/N Ratio:     127.59702190882  [ if not an image trigger ]
     Image S/N Ratio:    20.83

  Analysis Position:   [ source = BAT ]
    RA: 116.147921531733   Dec: 35.280440225944  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 116.162888944608   Dec: 35.2681889963701  [deg; J2000]  
        { 07h 44m 39.1s , +35d 16' 05.5" }
         +/- 0.755464643737225 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.216978079468621 [arcmin] (formal 1-sigma fit error)
    SNR: 45.4044244039341
 
  Angular difference between the analysis and refined position is 1.038199 arcmin
 
  Partial Coding Fraction: 0.421875    [ including projection effects ]

  Duration
     T90: 8.13199985027313 +/- 1.7350458486518
        Measured from: -3.85199999809265
                   to: 4.27999985218048     [s; relative to TRIGTIME]
     T50: 2.31199991703033 +/- 0.138852424002053
        Measured from: -0.444000005722046
                   to: 1.86799991130829     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0359998941421509     
                   to: 1.03599989414215     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -12.2160000801086     
                   to: 6.44400000572205     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.111970   1.983931   1.966970   0.599037
           0.046222   0.052473   0.049138   0.036646 [error]
 Peak      0.215990   0.436611   0.507236   0.173195
           0.014894   0.019014   0.020095   0.014369 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   18.660  -12.216    6.444
T90     8.132   -3.852    4.280
T50     2.312   -0.444    1.868
Peak    1.000    0.036    1.036
 
 
====== 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: CPL)
 
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      -1.181    -0.051      0.051       -           -               -         2.10e-02     -6.15e-04          6.14e-04      52.150   57
CPL     -0.779    -0.208      0.218      176.515     -41.854       119.427      3.15e-02     -5.81e-03          7.48e-03      40.720   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      -0.953     -0.074     0.075       -           -               -         8.95e-02     -4.03e-03          4.02e-03      67.830   57
CPL     -0.457     -0.313     0.337      180.035     -50.221       194.362      1.49e-01     -4.02e-02          5.96e-02      60.240   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-07  8.30e-07  1.46e-06  6.05e-06  4.00e-06  8.71e-06   erg/cm2
      90%_error_low -2.19e-08 -2.95e-08 -4.76e-08 -4.37e-07 -1.22e-07 -4.61e-07   erg/cm2
      90%_error_hi   2.24e-08  2.94e-08  4.75e-08  4.60e-07  1.23e-07  4.80e-07   erg/cm2
Peak flux       PL   7.86e-04  1.14e-02  1.04e-01  1.11e+01  4.65e-01  8.51e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
Fluence        CPL   3.34e-07  8.49e-07  1.53e-06  3.73e-06  3.93e-06  6.45e-06   erg/cm2
      90%_error_low -2.79e-08 -3.19e-08 -5.81e-08 -7.69e-07 -1.29e-07 -7.65e-07   erg/cm2
      90%_error_hi   2.85e-08  3.21e-08  5.86e-08  1.02e-06  1.28e-07  1.00e-06   erg/cm2
Peak flux      CPL   1.93e+00  3.15e+00  3.36e+00  3.74e+00  1.01e+01  1.22e+01   ph/cm2/s
      90%_error_low -2.42e-01 -1.86e-01 -1.99e-01 -8.96e-01 -4.75e-01 -1.00e+00   ph/cm2/s
      90%_error_hi   2.50e-01  1.88e-01  2.01e-01  1.25e+00  4.75e-01  1.29e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  116.1629    35.2682   0.0043    28.7857    91.6228         5.8989857     45.404 TRIG_01274039                 
 
Foreground time interval of the image:
-12.216   6.444 (delta_t =  18.660 [sec])
Background time interval of the image:
-146.547 -12.216 (delta_t = 134.331 [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  -12.216 sec. to    6.444 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.18148     ( -0.0510216   0.0512834 )
Norm@50keV  : 2.10021E-02    ( -0.000614619   0.00061418 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.15     using 59 bins.
 Reduced chi-squared = 0.914912
# Null hypothesis probability of 6.57e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 18.66 sec: 2.45899 ( -0.0763  0.07642 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.99753e-06 ( -1.22354e-07  1.2251e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -12.216 sec. to    6.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.778777     ( -0.207731   0.21799 )
Epeak [keV] : 176.515      ( -41.8543 119.427 )
Norm@50keV  : 3.15272E-02    ( -0.0058149   0.00747807 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.72     using 59 bins.
 Reduced chi-squared = 0.727143
# Null hypothesis probability of 9.38e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 18.66 sec: 2.40883 ( -0.07999  0.08015 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.93036e-06 ( -1.28798e-07  1.28295e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.036 sec. to    1.036 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.953132     ( -0.0739937   0.0747271 )
Norm@50keV  : 8.95058E-02    ( -0.00402907   0.00402397 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.83     using 59 bins.
 Reduced chi-squared = 1.19
# Null hypothesis probability of 1.54e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.464730 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.84555e-07 ( -4.77483e-08  4.78498e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.036 sec. to    1.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.456909     ( -0.312906   0.3371 )
Epeak [keV] : 180.035      ( -50.2213 194.361 )
Norm@50keV  : 0.149154    ( -0.040225   0.0595523 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.24     using 59 bins.
 Reduced chi-squared = 1.07571
# Null hypothesis probability of 3.25e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 10.1495 ( -0.475  0.475 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.75306e-08 ( -3.55753e-08  3.59134e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 8.132 sec.
Hardness ratio (energy fluence ratio) = 1.80148160533

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

S(15-50 keV)  = 1.183601e-06
S(50-150 keV) = 2.746716e-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 = -1.555907487129259E-02, IMY = -5.492086444347903E-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:
-146.547400 -12.216000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
148.0655  -0.1524    2.5  43.0   10.5   1.3821   4.6 ------	UNKNOWN                       
107.9239  76.5830    2.6  38.6  169.3   1.4223   4.4 ------	UNKNOWN                       
176.0534  76.1734    2.5  35.0 -165.9   1.1206   4.7 ------	UNKNOWN                       
227.3971  56.0931    2.6  48.1 -129.2   3.9541   4.4 ------	UNKNOWN                       

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

Time interval of the image:
-12.216000 6.444000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 62.9263  65.3719    2.6  51.7  152.3   1.8869   4.4 ------	UNKNOWN                       
116.1629  35.2682    0.3  28.8   91.6   5.8990  45.4 ------	UNKNOWN                       
145.1171  30.2672    2.5  13.7   31.4   0.3221   4.7 ------	UNKNOWN                       
170.2372  -3.1389    3.2  48.7  -19.8   0.5475   3.6 ------	UNKNOWN                       
190.1533  43.3169    2.3  27.5 -100.0   0.4357   5.1 ------	UNKNOWN                       
240.0181  62.7029    2.7  52.0 -140.0   1.2158   4.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
84.852600 943.852610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6169  22.0270    0.7  31.2   85.8  33.5826  16.3    1.2	Crab                          
117.1588  -7.7619    3.8  43.0   10.6   5.1943   3.0 ------	UNKNOWN                       
147.3813  31.6259    3.1  26.2  -78.9   4.7464   3.7 ------	UNKNOWN                       
149.4108 -12.7996    2.3  57.5  -27.3  29.2785   5.0 ------	UNKNOWN                       
158.3941  21.0901    2.6  39.5  -68.4  12.5559   4.5 ------	UNKNOWN                       
181.7274  59.2072    2.7  48.1 -129.1  22.4579   4.3 ------	UNKNOWN