GRB240624A: 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: Sat Oct 19 15:12:17 EDT 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1238732
======================================================================

  Trigger: 01238732      Segment: 000

  BAT Trigger Time: 740901703.68   [s; MET]
      Trigger Stop: 740901704.192   [s; MET]
               UTC: 2024-06-24T06:01:09.993340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 102.444139065186   Dec: -6.54353811645944  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.71
     Image Trigger?:     NO
     Rate S/N Ratio:     13.4536240470737  [ if not an image trigger ]
     Image S/N Ratio:    7.71

  Analysis Position:   [ source = BAT ]
    RA: 102.444139065186   Dec: -6.54353811645944  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 102.47272137938   Dec: -6.53743531867838  [deg; J2000]  
        { 06h 49m 53.5s , -06d 32' 14.8" }
         +/- 1.74461724576491 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.994337733940402 [arcmin] (formal 1-sigma fit error)
    SNR: 13.7351192822227
 
  Angular difference between the analysis and refined position is 1.742681 arcmin
 
  Partial Coding Fraction: 0.4960938    [ including projection effects ]

  Duration
     T90: 5.8879998922348 +/- 2.00044790779143
        Measured from: 0.128000020980835
                   to: 6.01599991321564     [s; relative to TRIGTIME]
     T50: 1.53599989414215 +/- 0.749100805041139
        Measured from: 0.896000027656555
                   to: 2.43199992179871     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.876000046730042     
                   to: 1.87600004673004     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0639998912811279     
                   to: 7.04000008106232     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.136601   0.311121   0.222049   0.034801
           0.025768   0.027583   0.024312   0.019517 [error]
 Peak      0.035382   0.125012   0.105790   0.013240
           0.010697   0.012440   0.010750   0.007152 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    7.104   -0.064    7.040
T90     5.888    0.128    6.016
T50     1.536    0.896    2.432
Peak    1.000    0.876    1.876
 
 
====== 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      -1.331    -0.171      0.173       -           -               -         7.12e-03     -7.57e-04          7.57e-04      64.720   57
CPL     -0.166    -0.803      0.983       80.502     -17.082        65.140      2.68e-02     -1.59e-02          5.24e-02      58.170   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      -1.267     -0.174     0.177       -           -               -         1.94e-02     -2.30e-03          2.30e-03      78.680   57
CPL      1.069     -1.046     1.338       69.863      -9.148        16.238      2.51e-01     -2.51e-01          7.50e-01      60.400   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   5.51e-08  1.12e-07  1.79e-07  6.32e-07  4.96e-07  9.78e-07   erg/cm2
      90%_error_low -9.94e-09 -1.31e-08 -2.29e-08 -1.56e-07 -5.74e-08 -1.75e-07   erg/cm2
      90%_error_hi   1.04e-08  1.30e-08  2.28e-08  1.87e-07  5.78e-08  2.01e-07   erg/cm2
Peak flux       PL   6.37e-01  7.37e-01  6.13e-01  8.57e-01  2.30e+00  2.84e+00   ph/cm2/s
      90%_error_low -1.27e-01 -9.95e-02 -8.10e-02 -2.01e-01 -2.81e-01 -3.44e-01   ph/cm2/s
      90%_error_hi   1.34e-01  9.87e-02  8.06e-02  2.33e-01  2.82e-01  3.46e-01   ph/cm2/s
 
Fluence        CPL   4.48e-08  1.26e-07  1.93e-07  1.64e-07  4.61e-07  5.28e-07   erg/cm2
      90%_error_low -1.20e-08 -1.65e-08 -2.69e-08 -9.01e-08 -6.23e-08 -1.07e-07   erg/cm2
      90%_error_hi   1.24e-08  1.71e-08  2.74e-08  2.21e-07  6.31e-08  2.20e-07   erg/cm2
Peak flux      CPL   3.87e-01  8.74e-01  7.66e-01  1.84e-01  2.18e+00  2.21e+00   ph/cm2/s
      90%_error_low -1.43e-01 -1.31e-01 -1.09e-01 -9.17e-02 -2.85e-01 -2.99e-01   ph/cm2/s
      90%_error_hi   1.59e-01  1.33e-01  1.12e-01  1.50e-01  2.87e-01  3.09e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  102.4727    -6.5374   0.0140    30.9319   -63.0790         0.7003248     13.735 TRIG_01238732                 
 
Foreground time interval of the image:
 -0.064   7.040 (delta_t =   7.104 [sec])
Background time interval of the image:
-229.579  -0.064 (delta_t = 229.515 [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   -0.064 sec. to    7.040 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33057     ( -0.171124   0.17253 )
Norm@50keV  : 7.12057E-03    ( -0.00075713   0.000756761 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.72     using 59 bins.
 Reduced chi-squared = 1.13544
# Null hypothesis probability of 2.25e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 7.104 sec: 0.854485 ( -0.093148  0.093337 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.96298e-07 ( -5.74211e-08  5.78207e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.064 sec. to    7.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.166332     ( -0.803203   0.983366 )
Epeak [keV] : 80.5018      ( -17.0815 65.1399 )
Norm@50keV  : 2.68299E-02    ( -0.0158552   0.052418 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.17     using 59 bins.
 Reduced chi-squared = 1.03875
# Null hypothesis probability of 3.95e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 7.104 sec: 0.819737 ( -0.096784  0.096713 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.61066e-07 ( -6.22587e-08  6.3105e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.876 sec. to    1.876 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.26682     ( -0.174403   0.176403 )
Norm@50keV  : 1.93570E-02    ( -0.00229704   0.00229703 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   78.68     using 59 bins.
 Reduced chi-squared = 1.38035
# Null hypothesis probability of 3.01e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.29579 ( -0.28095  0.2816 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.92903e-07 ( -2.4337e-08  2.44472e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.876 sec. to    1.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.06942     ( -1.04564   1.33757 )
Epeak [keV] : 69.8632      ( -9.14842 16.2378 )
Norm@50keV  : 0.250647    ( -0.250647   0.749871 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.40     using 59 bins.
 Reduced chi-squared = 1.07857
# Null hypothesis probability of 3.20e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.18104 ( -0.28536  0.2873 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78066e-07 ( -2.45301e-08  2.51837e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 5.888 sec.
Hardness ratio (energy fluence ratio) = 1.53748298974

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

S(15-50 keV)  = 1.7058319e-07
S(50-150 keV) = 2.904858e-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 = 2.713152141104851E-01, IMY = 5.343054176126579E-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:
-229.579410 -0.064000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4893 -40.5403    3.0  51.8    1.0   3.2828   3.8    2.0	Vela X-1                      
 86.4460 -38.9737    2.7  17.2   29.0   1.5304   4.3 ------	UNKNOWN                       
 48.2442  -1.2821    2.8  35.3 -176.2   2.0015   4.1 ------	UNKNOWN                       

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

Time interval of the image:
-0.064000 7.040000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4403 -40.4646    6.8  51.7    0.9  -0.1829  -1.7    6.7	Vela X-1                      
 69.8805 -47.1662    1.8  23.4   68.0   0.2681   6.5 ------	UNKNOWN                       
 34.6312   3.4427    2.5  48.8  176.2   0.3453   4.6 ------	UNKNOWN                       
102.4727  -6.5375    0.8  30.9  -63.1   0.7003  13.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
619.720630 962.364300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5222 -40.5521    2.8  30.9  116.5   3.5308   4.1    0.3	Vela X-1                      
158.9973 -40.6114    2.0  40.5   90.6   9.6886   5.7 ------	UNKNOWN                       
153.0894 -32.3218    2.4  31.6   84.8   4.8996   4.8 ------	UNKNOWN                       
128.3845 -39.6630    2.4  29.4  127.1   3.8153   4.8 ------	UNKNOWN                       
169.3730  34.4470    3.6  59.2  -14.1   5.8074   3.3 ------	UNKNOWN                       
 69.8306 -19.8482    2.4  57.2 -160.1   9.9552   4.8 ------	UNKNOWN                       
 80.3593 -10.5701    2.5  47.3 -148.0   4.8089   4.6 ------	UNKNOWN