GRB241025A: 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 16:34:51 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1262165
======================================================================

  Trigger: 01262165      Segment: 000

  BAT Trigger Time: 751513044.992   [s; MET]
      Trigger Stop: 751513047.04   [s; MET]
               UTC: 2024-10-25T01:36:50.578960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 333.329884396242   Dec: 83.5663113072757  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.01
     Image Trigger?:     NO
     Rate S/N Ratio:     13.2664991614216  [ if not an image trigger ]
     Image S/N Ratio:    9.01

  Analysis Position:   [ source = BAT ]
    RA: 333.329884396242   Dec: 83.5663113072757  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 333.705613534445   Dec: 83.5773842353946  [deg; J2000]  
        { 22h 14m 49.3s , +83d 34' 38.6" }
         +/- 0.811264955880741 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.245178822170756 [arcmin] (formal 1-sigma fit error)
    SNR: 41.0096372964289
 
  Angular difference between the analysis and refined position is 2.609907 arcmin
 
  Partial Coding Fraction: 0.46875    [ including projection effects ]

  Duration
     T90: 130.088000059128 +/- 4.96977425860298
        Measured from: -20.932000041008
                   to: 109.15600001812     [s; relative to TRIGTIME]
     T50: 70.1799999475479 +/- 4.39161389354715
        Measured from: -1.86000001430511
                   to: 68.3199999332428     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 22.1640000343323     
                   to: 23.1640000343323     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -28.4279999732971     
                   to: 132.907999992371     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.074510   3.252213   2.976737   0.818898
           0.090362   0.094345   0.081882   0.064414 [error]
 Peak      0.046726   0.076973   0.079894   0.019370
           0.009100   0.010057   0.009113   0.006427 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  161.336  -28.428  132.908
T90   130.088  -20.932  109.156
T50    70.180   -1.860   68.320
Peak    1.000   22.164   23.164
 
 
====== 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      -1.365    -0.057      0.057       -           -               -         3.93e-03     -1.25e-04          1.25e-04      53.980   57
CPL     -0.997    -0.232      0.245      153.989     -39.539       153.615      5.75e-03     -1.20e-03          1.60e-03      46.410   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      -1.241     -0.203     0.207       -           -               -         1.60e-02     -2.00e-03          2.00e-03      57.470   57
CPL     -0.834     -0.511     0.921      161.386    -161.386      -161.386      2.47e-02     -1.04e-02          3.81e-02      56.690   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   7.14e-07  1.42e-06  2.21e-06  7.55e-06  6.18e-06  1.19e-05   erg/cm2
      90%_error_low -4.54e-08 -5.42e-08 -8.17e-08 -6.17e-07 -2.05e-07 -6.61e-07   erg/cm2
      90%_error_hi   4.64e-08  5.40e-08  8.15e-08  6.53e-07  2.06e-07  6.90e-07   erg/cm2
Peak flux       PL   5.15e-01  6.05e-01  5.12e-01  7.34e-01  1.89e+00  2.37e+00   ph/cm2/s
      90%_error_low -1.19e-01 -9.17e-02 -7.00e-02 -1.88e-01 -2.49e-01 -2.97e-01   ph/cm2/s
      90%_error_hi   1.28e-01  9.02e-02  6.92e-02  2.22e-01  2.50e-01  2.99e-01   ph/cm2/s
 
Fluence        CPL   6.51e-07  1.46e-06  2.29e-06  4.80e-06  6.06e-06  9.20e-06   erg/cm2
      90%_error_low -5.81e-08 -5.87e-08 -9.63e-08 -1.12e-06 -2.20e-07 -1.12e-06   erg/cm2
      90%_error_hi   5.94e-08  5.91e-08  9.72e-08  1.54e-06  2.19e-07  1.53e-06   erg/cm2
Peak flux      CPL   4.68e-01  6.23e-01  5.40e-01  5.01e-01  1.87e+00  2.13e+00   ph/cm2/s
      90%_error_low -7.70e-02 -9.96e-02 -8.70e-02 -2.54e-01 -2.53e-01 -3.74e-01   ph/cm2/s
      90%_error_hi   1.54e-01  1.02e-01  9.01e-02  3.07e-01  2.54e-01  4.19e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  333.7056    83.5774   0.0047    39.3291   -31.5989         5.8252301     41.010 TRIG_01262165                 
 
Foreground time interval of the image:
-28.428  23.509 (delta_t =  51.937 [sec])
Background time interval of the image:
-239.992 -28.428 (delta_t = 211.564 [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  -28.428 sec. to  132.908 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36508     ( -0.0571837   0.0573832 )
Norm@50keV  : 3.93244E-03    ( -0.00012515   0.000125125 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.98     using 59 bins.
 Reduced chi-squared = 0.947018
# Null hypothesis probability of 5.89e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 161.3 sec: 0.475246 ( -0.016571  0.016618 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.17524e-06 ( -2.05378e-07  2.05548e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -28.428 sec. to  132.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.996533     ( -0.231829   0.244649 )
Epeak [keV] : 153.989      ( -39.5389 153.616 )
Norm@50keV  : 5.75368E-03    ( -0.00119612   0.00159829 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.41     using 59 bins.
 Reduced chi-squared = 0.82875
# Null hypothesis probability of 8.16e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 161.3 sec: 0.464475 ( -0.017755  0.01783 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.05793e-06 ( -2.20058e-07  2.19249e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   22.164 sec. to   23.164 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.24081     ( -0.202513   0.20738 )
Norm@50keV  : 1.60327E-02    ( -0.00200176   0.00199595 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.47     using 59 bins.
 Reduced chi-squared = 1.00825
# Null hypothesis probability of 4.58e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.89345 ( -0.24904  0.24995 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.60864e-07 ( -2.09923e-08  2.10432e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   22.164 sec. to   23.164 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.833911     ( -0.510934   0.921428 )
Epeak [keV] : 161.386      ( -161.406 -161.406 )
Norm@50keV  : 2.47114E-02    ( -0.0104078   0.0380597 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.69     using 59 bins.
 Reduced chi-squared = 1.01232
# Null hypothesis probability of 4.49e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.87049 ( -0.25344  0.25396 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.58921e-07 ( -2.17507e-08  2.15469e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 130.088 sec.
Hardness ratio (energy fluence ratio) = 1.57536095782

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

S(15-50 keV)  = 2.1062715e-06
S(50-150 keV) = 3.951618e-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 = 6.978609709133737E-01, IMY = 4.293089372563206E-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:
-239.992000 -28.428000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6046  35.1847    0.6  33.2 -121.4   7.2168  18.9    1.2	Cyg X-1                       
308.0945  40.9482    2.8  24.8 -116.2   1.2018   4.1    0.8	Cyg X-3                       
326.2281  38.2897    4.5  13.1 -142.3   0.6450   2.6    3.3	Cyg X-2                       
297.1034  38.1839    2.5  33.7 -114.9   1.9266   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-28.428000 23.508600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5948  35.3348   22.4  33.2 -121.1   0.0746   0.5    8.0	Cyg X-1                       
308.2211  41.0595    5.2  24.7 -116.0  -0.2498  -2.2    8.1	Cyg X-3                       
326.3926  38.3702    8.0  12.9 -142.3   0.1240   1.5   10.8	Cyg X-2                       
317.2065  -7.9406    2.9  56.8  179.2   2.0679   3.9 ------	UNKNOWN                       
 71.1316  80.6249    2.6  46.3  -17.2   0.7515   4.4 ------	UNKNOWN                       
333.7056  83.5774    0.3  39.3  -31.6   5.8250  41.0 ------	UNKNOWN                       
300.3467  33.1929    2.2  33.7 -125.1   0.7372   5.2 ------	UNKNOWN                       
284.1933  40.7653    2.8  41.6 -104.2   1.6573   4.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
103.308600 962.081100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5550  35.1983    1.5  49.6 -175.2  19.0638   7.8    1.7	Cyg X-1                       
308.2393  41.0638    4.6  43.2  176.0   4.3275   2.5    8.9	Cyg X-3                       
326.3158  38.2859    7.5  45.3  155.9   4.4412   1.5    7.1	Cyg X-2                       
 91.8100  49.3245    3.5  44.0   23.7   4.5449   3.3 ------	UNKNOWN                       
303.3406  32.8347    2.5  51.7 -179.5  12.7485   4.7 ------	UNKNOWN                       
256.2283  40.7697    3.5  48.1 -129.2  17.5390   3.3 ------	UNKNOWN