GRB250603A: 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 20:31:37 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1320335
======================================================================

  Trigger: 01320335      Segment: 000

  BAT Trigger Time: 770605858.816   [s; MET]
      Trigger Stop: 770605859.84   [s; MET]
               UTC: 2025-06-03T01:10:23.098520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 129.91830155637   Dec: -39.2683922386952  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.82
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6189500386223  [ if not an image trigger ]
     Image S/N Ratio:    7.82

  Analysis Position:   [ source = BAT ]
    RA: 129.91830155637   Dec: -39.2683922386952  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 129.94746943489   Dec: -39.3091152540435  [deg; J2000]  
        { 08h 39m 47.4s , -39d 18' 32.8" }
         +/- 1.9648503418564 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.681663951165176 [arcmin] (formal 1-sigma fit error)
    SNR: 11.5898087727061
 
  Angular difference between the analysis and refined position is 2.793701 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 15.7120000123978 +/- 11.8749769185584
        Measured from: -11.6840000152588
                   to: 4.02799999713898     [s; relative to TRIGTIME]
     T50: 1.93599987030029 +/- 7.63888076082279
        Measured from: -0.0239999294281006
                   to: 1.91199994087219     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.136000037193298     
                   to: 1.1360000371933     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -13.8639999628067     
                   to: 15.8000000715256     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.179106   0.265304   0.116869   0.054554
           0.038378   0.039342   0.032385   0.026648 [error]
 Peak      0.044311   0.068719   0.037160   0.006821
           0.007633   0.008259   0.006591   0.005046 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   29.664  -13.864   15.800
T90    15.712  -11.684    4.028
T50     1.936   -0.024    1.912
Peak    1.000    0.136    1.136
 
 
====== 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: 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      -1.781    -0.312      0.297       -           -               -         1.31e-03     -2.64e-04          2.57e-04      75.430   57
CPL     -1.260    -0.956      1.805       60.819     -60.564       -60.819      2.62e-03     -2.62e-03          2.96e-02      74.900   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      -1.726     -0.237     0.228       -           -               -         9.59e-03     -1.54e-03          1.52e-03      51.710   57
CPL     -0.468     -0.992     1.300       55.325     -12.181        41.532      4.71e-02     -4.71e-02          2.02e-01      46.730   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   6.49e-08  1.00e-07  1.17e-07  2.62e-07  3.59e-07  5.44e-07   erg/cm2
      90%_error_low -1.64e-08 -1.76e-08 -3.06e-08 -1.16e-07 -7.23e-08 -1.52e-07   erg/cm2
      90%_error_hi   1.71e-08  1.76e-08  3.10e-08  1.64e-07  7.39e-08  1.89e-07   erg/cm2
Peak flux       PL   4.90e-01  4.32e-01  2.61e-01  2.38e-01  1.29e+00  1.42e+00   ph/cm2/s
      90%_error_low -1.04e-01 -6.43e-02 -5.21e-02 -7.99e-02 -1.90e-01 -2.10e-01   ph/cm2/s
      90%_error_hi   1.08e-01  6.42e-02  5.21e-02  9.95e-02  1.90e-01  2.11e-01   ph/cm2/s
 
Fluence        CPL   6.22e-08  1.08e-07  1.16e-07  1.07e-07  3.41e-07  3.93e-07   erg/cm2
      90%_error_low -1.79e-08 -2.12e-08 -4.05e-08 -9.69e-08 -8.53e-08 -1.35e-07   erg/cm2
      90%_error_hi   1.82e-08  2.69e-08  3.37e-08  1.94e-07  8.47e-08  2.20e-07   erg/cm2
Peak flux      CPL   4.22e-01  5.02e-01  2.77e-01  6.80e-02  1.26e+00  1.27e+00   ph/cm2/s
      90%_error_low -1.18e-01 -8.56e-02 -6.44e-02 -6.80e-02 -1.91e-01 -1.99e-01   ph/cm2/s
      90%_error_hi   1.22e-01  9.10e-02  6.27e-02  1.13e-01  1.92e-01  2.06e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  129.9475   -39.3091   0.0166    31.3421    -9.8427         0.8137395     11.590 TRIG_01320335                 
 
Foreground time interval of the image:
-13.864  11.685 (delta_t =  25.549 [sec])
Background time interval of the image:
-239.816 -13.864 (delta_t = 225.952 [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  -13.864 sec. to   15.800 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.78127     ( -0.312215   0.297095 )
Norm@50keV  : 1.31425E-03    ( -0.000263554   0.000256678 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   75.43     using 59 bins.
 Reduced chi-squared = 1.32333
# Null hypothesis probability of 5.16e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 29.66 sec: 0.179812 ( -0.031677  0.031699 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.5918e-07 ( -7.22989e-08  7.38736e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -13.864 sec. to   15.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25981     ( -0.9564   1.80503 )
Epeak [keV] : 60.8191      ( -60.5607 -60.8161 )
Norm@50keV  : 2.61837E-03    ( -0.00261859   0.0295621 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   74.90     using 59 bins.
 Reduced chi-squared = 1.3375
# Null hypothesis probability of 4.67e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 29.66 sec: 0.177164 ( -0.032388  0.032306 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.40627e-07 ( -8.52683e-08  8.47273e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.136 sec. to    1.136 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.7262     ( -0.237334   0.228233 )
Norm@50keV  : 9.58679E-03    ( -0.00154211   0.00151999 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.71     using 59 bins.
 Reduced chi-squared = 0.907193
# Null hypothesis probability of 6.73e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.28516 ( -0.1903  0.19045 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.86074e-08 ( -1.46145e-08  1.48091e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.136 sec. to    1.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.467891     ( -0.99151   1.29974 )
Epeak [keV] : 55.3246      ( -12.1811 41.532 )
Norm@50keV  : 4.71112E-02    ( -0.0471111   0.201776 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.73     using 59 bins.
 Reduced chi-squared = 0.834464
# Null hypothesis probability of 8.07e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.25554 ( -0.19138  0.19174 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.22129e-08 ( -1.49648e-08  1.55311e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = 6.000525167386274E-01, IMY = 1.041072258269904E-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:
-239.816000 -13.864000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4898 -40.5527    3.3  33.3   -2.5   1.3447   3.5    1.8	Vela X-1                      
170.3152 -60.4832   10.9  39.0   47.2  -0.6747  -1.1    8.4	Cen X-3                       
138.5543 -35.5642    2.5  38.7   -5.1   1.8747   4.5 ------	UNKNOWN                       
 68.2014 -37.1198    2.6  24.8 -127.3   1.4276   4.4 ------	UNKNOWN                       
 35.7999 -27.8724    2.9  47.8 -158.0   2.6258   4.0 ------	UNKNOWN                       
 83.5753 -18.2959    2.7  39.3  -92.0   5.1918   4.2 ------	UNKNOWN                       
 61.7923 -17.8259    2.4  44.7 -122.1   6.5741   4.8 ------	UNKNOWN                       

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

Time interval of the image:
-13.864000 11.684600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3397 -40.5259    3.9  33.3   -2.6  -0.2142  -3.0    8.8	Vela X-1                      
170.2277 -60.7098    3.7  38.8   47.5   0.3947   3.2    5.8	Cen X-3                       
  0.6761 -68.6107    2.1  38.2  133.9   0.6738   5.6 ------	UNKNOWN                       
129.9475 -39.3091    1.0  31.3   -9.8   0.8137  11.6 ------	UNKNOWN                       
 85.9792 -25.6872    2.1  31.7  -89.3   0.5459   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
84.684600 962.279000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5695 -40.5952    1.8   4.5   71.9   6.1357   6.3    3.1	Vela X-1                      
169.9923 -60.6899   18.6  32.7  107.3  -1.3177  -0.6   10.3	Cen X-3                       
186.3176 -62.6887    0.0  40.6  107.1   5.9163   1.2   10.5	GX 301-2                      
 65.1018 -74.4650    3.6  45.7  162.8  11.1065   3.2 ------	UNKNOWN                       
 53.1294 -53.8272    3.5  52.0 -170.2  10.4312   3.3 ------	UNKNOWN                       
108.7418 -14.9742    2.5  30.6  -80.3   6.9281   4.6 ------	UNKNOWN                       
111.5309   1.1545    3.0  43.8  -64.1  20.4053   3.8 ------	UNKNOWN