GRB241209D: 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 22:12:29 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1273106
======================================================================

  Trigger: 01273106      Segment: 000

  BAT Trigger Time: 755434821.12   [s; MET]
      Trigger Stop: 755434822.144   [s; MET]
               UTC: 2024-12-09T10:59:46.438980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 190.110870775986   Dec: -2.87869882402428  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.99
     Image Trigger?:     NO
     Rate S/N Ratio:     29.9833287011299  [ if not an image trigger ]
     Image S/N Ratio:    12.99

  Analysis Position:   [ source = BAT ]
    RA: 190.110870775986   Dec: -2.87869882402428  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 190.103023195257   Dec: -2.88696545475153  [deg; J2000]  
        { 12h 40m 24.7s , -02d 53' 13.1" }
         +/- 0.866927626040128 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.321229947418876 [arcmin] (formal 1-sigma fit error)
    SNR: 37.3004712816562
 
  Angular difference between the analysis and refined position is 0.683489 arcmin
 
  Partial Coding Fraction: 0.65625    [ including projection effects ]

  Duration
     T90: 64 +/- 16
        Measured from: -15.1200000047684
                   to: 48.8799999952316     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: 0.879999995231628
                   to: 16.8799999952316     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.37999999523163     
                   to: 9.37999999523163     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.1200000047684     
                   to: 64.8799999952316     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.419217   3.860042   3.101502   0.622578
           0.071957   0.078823   0.071193   0.055954 [error]
 Peak      0.033721   0.077068   0.052942   0.011637
           0.008567   0.009790   0.008599   0.006435 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   80.000  -15.120   64.880
T90    64.000  -15.120   48.880
T50    16.000    0.880   16.880
Peak    1.000    8.380    9.380
 
 
====== 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      -1.451    -0.047      0.047       -           -               -         8.65e-03     -2.24e-04          2.24e-04      85.620   57
CPL     -0.874    -0.204      0.213      106.093     -14.911        28.290      1.60e-02     -3.04e-03          3.95e-03      60.310   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      -1.475     -0.242     0.236       -           -               -         1.18e-02     -1.89e-03          1.87e-03      57.980   57
CPL      0.009     -1.108     1.462       65.641     -14.352        53.545      7.01e-02     -7.01e-02          3.29e-01      52.380   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   8.44e-07  1.60e-06  2.34e-06  7.30e-06  6.62e-06  1.21e-05   erg/cm2
      90%_error_low -4.22e-08 -4.75e-08 -7.40e-08 -5.07e-07 -1.82e-07 -5.52e-07   erg/cm2
      90%_error_hi   4.30e-08  4.74e-08  7.38e-08  5.32e-07  1.83e-07  5.72e-07   erg/cm2
Peak flux       PL   4.75e-01  4.85e-01  3.49e-01  4.02e-01  1.47e+00  1.71e+00   ph/cm2/s
      90%_error_low -1.10e-01 -7.73e-02 -6.83e-02 -1.34e-01 -2.26e-01 -2.70e-01   ph/cm2/s
      90%_error_hi   1.16e-01  7.68e-02  6.78e-02  1.67e-01  2.26e-01  2.73e-01   ph/cm2/s
 
Fluence        CPL   7.37e-07  1.66e-06  2.45e-06  3.61e-06  6.38e-06  8.45e-06   erg/cm2
      90%_error_low -5.35e-08 -5.32e-08 -8.49e-08 -7.12e-07 -2.02e-07 -7.31e-07   erg/cm2
      90%_error_hi   5.45e-08  5.36e-08  8.55e-08  9.30e-07  2.02e-07  9.35e-07   erg/cm2
Peak flux      CPL   3.78e-01  5.68e-01  3.89e-01  1.08e-01  1.42e+00  1.44e+00   ph/cm2/s
      90%_error_low -1.27e-01 -1.01e-01 -8.41e-02 -1.08e-01 -2.28e-01 -2.41e-01   ph/cm2/s
      90%_error_hi   1.35e-01  1.07e-01  8.47e-02  1.71e-01  2.28e-01  2.59e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  190.1030    -2.8870   0.0052    26.8836    37.4443         4.1253786     37.300 TRIG_01273106                 
 
Foreground time interval of the image:
-15.120  15.181 (delta_t =  30.301 [sec])
Background time interval of the image:
-239.120 -15.120 (delta_t = 224.000 [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  -15.120 sec. to   64.880 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45122     ( -0.0471154   0.0471175 )
Norm@50keV  : 8.64605E-03    ( -0.000224301   0.000224296 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   85.62     using 59 bins.
 Reduced chi-squared = 1.50211
# Null hypothesis probability of 8.42e-03 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 80 sec: 1.06585 ( -0.02997  0.03004 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.6182e-06 ( -1.8229e-07  1.82756e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -15.120 sec. to   64.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.874078     ( -0.203585   0.213192 )
Epeak [keV] : 106.093      ( -14.9112 28.2902 )
Norm@50keV  : 1.59799E-02    ( -0.00304008   0.00395268 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.31     using 59 bins.
 Reduced chi-squared = 1.07696
# Null hypothesis probability of 3.23e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 80 sec: 1.02640 ( -0.032496  0.03259 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.3772e-06 ( -2.02157e-07  2.0165e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    8.380 sec. to    9.380 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47461     ( -0.241994   0.235545 )
Norm@50keV  : 1.18151E-02    ( -0.00189051   0.00187467 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.98     using 59 bins.
 Reduced chi-squared = 1.01719
# Null hypothesis probability of 4.39e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.46518 ( -0.22561  0.22574 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12582e-07 ( -1.95441e-08  1.98064e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    8.380 sec. to    9.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.00918361     ( -1.10763   1.46189 )
Epeak [keV] : 65.6412      ( -14.3523 53.5449 )
Norm@50keV  : 7.00599E-02    ( -0.0700599   0.329264 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.38     using 59 bins.
 Reduced chi-squared = 0.935357
# Null hypothesis probability of 6.13e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.41956 ( -0.22771  0.22827 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03727e-07 ( -2.0003e-08  2.08621e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 64.0 sec.
Hardness ratio (energy fluence ratio) = 1.47601214288

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

S(15-50 keV)  = 2.3936812e-06
S(50-150 keV) = 3.983471e-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 = 4.025049784344334E-01, IMY = -3.082318771517079E-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:
-239.120000 -15.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9603 -15.6409    0.8  35.5  -90.0  13.8545  14.2    1.1	Sco X-1                       
254.3856  35.4301    9.6  46.8 -171.9  -0.9789  -1.2    6.3	Her X-1                       
185.4740 -23.3217    2.9  41.0    9.0   2.5151   3.9 ------	UNKNOWN                       
229.0037  -5.9994    3.3  17.1  -86.4   1.5023   3.5 ------	UNKNOWN                       

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

Time interval of the image:
-15.120000 15.180590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0403 -15.8244    0.0  35.6  -89.8   0.3556   1.7   11.6	Sco X-1                       
254.4078  35.1717    5.7  46.6 -171.6   0.3313   2.0   10.5	Her X-1                       
178.0105  23.3963    2.4  40.8   84.5   1.9219   4.9 ------	UNKNOWN                       
208.3882  53.3640    1.9  48.8  138.0   2.5433   6.0 ------	UNKNOWN                       
190.1030  -2.8870    0.3  26.9   37.4   4.1248  37.3 ------	UNKNOWN                       
255.3973  49.9603    2.2  55.9  173.6   2.3493   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
80.980600 284.180600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
173.6514  30.6745    2.6  37.1  132.8   3.4762   4.4 ------	UNKNOWN                       
165.4177 -31.8699    2.8  37.1   12.6   2.1311   4.1 ------	UNKNOWN                       
162.1694 -49.2235    2.6  52.1   -0.6   3.2239   4.5 ------	UNKNOWN