GRB240712A: 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 15:10:44 EDT 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1242223
======================================================================

  Trigger: 01242223      Segment: 000

  BAT Trigger Time: 742447666.624   [s; MET]
      Trigger Stop: 742447674.816   [s; MET]
               UTC: 2024-07-12T03:27:12.831520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 122.368929948927   Dec: -37.0767268156002  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.11
     Image Trigger?:     NO
     Rate S/N Ratio:     12.6095202129185  [ if not an image trigger ]
     Image S/N Ratio:    7.11

  Analysis Position:   [ source = BAT ]
    RA: 122.368929948927   Dec: -37.0767268156002  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 122.37956792607   Dec: -37.097278920141  [deg; J2000]  
        { 08h 09m 31.1s , -37d 05' 50.2" }
         +/- 2.48858899462288 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.43358141336616 [arcmin] (formal 1-sigma fit error)
    SNR: 8.26934260453583
 
  Angular difference between the analysis and refined position is 1.334111 arcmin
 
  Partial Coding Fraction: 0.9375    [ including projection effects ]

  Duration
     T90: 12.7799999713898 +/- 2.71105891575919
        Measured from: -0.579999923706055
                   to: 12.2000000476837     [s; relative to TRIGTIME]
     T50: 6.73199987411499 +/- 3.54843072359151
        Measured from: 1.39200007915497
                   to: 8.12399995326996     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.24000000953674     
                   to: 2.24000000953674     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.08799993991852     
                   to: 12.4000000953674     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.081796   0.138233   0.133574   0.010123
           0.022119   0.023154   0.020141   0.017350 [error]
 Peak      0.011047   0.023502   0.025209   0.002494
           0.006073   0.006486   0.005626   0.004758 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   13.488   -1.088   12.400
T90    12.780   -0.580   12.200
T50     6.732    1.392    8.124
Peak    1.000    1.240    2.240
 
 
====== 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: 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      -1.290    -0.279      0.282       -           -               -         1.98e-03     -3.24e-04          3.23e-04      51.450   57
CPL     -0.698    -0.807      1.342      118.266     -50.205      -118.266      3.78e-03     -2.05e-03          1.10e-02      50.540   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      -1.315     -0.491     0.491       -           -               -         4.08e-03     -1.20e-03          1.19e-03      64.060   57
CPL      0.070     -1.749     3.677       82.030     -57.920       -82.030      1.78e-02     -1.78e-02          5.42e-01      62.910   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   2.80e-08  5.85e-08  9.57e-08  3.53e-07  2.64e-07  5.35e-07   erg/cm2
      90%_error_low -7.89e-09 -1.06e-08 -1.93e-08 -1.32e-07 -4.78e-08 -1.49e-07   erg/cm2
      90%_error_hi   8.53e-09  1.04e-08  1.90e-08  1.79e-07  4.83e-08  1.88e-07   erg/cm2
Peak flux       PL   1.41e-01  1.58e-01  1.27e-01  1.70e-01  4.88e-01  5.96e-01   ph/cm2/s
      90%_error_low -6.62e-02 -5.22e-02 -4.43e-02 -9.51e-02 -1.45e-01 -1.78e-01   ph/cm2/s
      90%_error_hi   7.70e-02  5.08e-02  4.32e-02  1.45e-01  1.46e-01  1.82e-01   ph/cm2/s
 
Fluence        CPL   2.47e-08  6.15e-08  1.01e-07  1.66e-07  2.56e-07  3.53e-07   erg/cm2
      90%_error_low -9.88e-09 -1.14e-08 -2.16e-08 -1.15e-07 -5.03e-08 -1.27e-07   erg/cm2
      90%_error_hi   1.02e-08  1.26e-08  2.26e-08  3.45e-07  5.09e-08  2.48e-07   erg/cm2
Peak flux      CPL   1.01e-01  1.72e-01  1.47e-01  6.06e-02  4.62e-01  4.80e-01   ph/cm2/s
      90%_error_low -7.91e-02 -6.43e-02 -5.43e-02 -6.06e-02 -1.54e-01 -1.69e-01   ph/cm2/s
      90%_error_hi   9.77e-02  6.34e-02  5.87e-02  1.54e-01  1.53e-01  2.21e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  122.3796   -37.0973   0.0232    21.3699    -3.0989         0.3581363      8.269 TRIG_01242223                 
 
Foreground time interval of the image:
 -1.088  12.400 (delta_t =  13.488 [sec])
Background time interval of the image:
-239.624  -1.088 (delta_t = 238.536 [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   -1.088 sec. to   12.400 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.28988     ( -0.278839   0.28219 )
Norm@50keV  : 1.97766E-03    ( -0.00032393   0.000323062 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.45     using 59 bins.
 Reduced chi-squared = 0.902632
# Null hypothesis probability of 6.82e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 13.49 sec: 0.235509 ( -0.039312  0.039413 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.64322e-07 ( -4.77549e-08  4.8338e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -1.088 sec. to   12.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.697536     ( -0.807222   1.34203 )
Epeak [keV] : 118.266      ( -50.2251 -118.286 )
Norm@50keV  : 3.77723E-03    ( -0.00205244   0.0110186 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.54     using 59 bins.
 Reduced chi-squared = 0.9025
# Null hypothesis probability of 6.81e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 13.49 sec: 0.229636 ( -0.041074  0.04085 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.55565e-07 ( -5.02782e-08  5.0851e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.240 sec. to    2.240 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.31522     ( -0.491387   0.490744 )
Norm@50keV  : 4.08154E-03    ( -0.00119553   0.00119343 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.06     using 59 bins.
 Reduced chi-squared = 1.12386
# Null hypothesis probability of 2.43e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.488336 ( -0.145307  0.145971 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.01902e-08 ( -1.28054e-08  1.30562e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.240 sec. to    2.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.0695244     ( -1.74954   3.67666 )
Epeak [keV] : 82.0296      ( -57.9045 -82.0141 )
Norm@50keV  : 1.78101E-02    ( -0.0178256   0.541714 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.91     using 59 bins.
 Reduced chi-squared = 1.12339
# Null hypothesis probability of 2.45e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.462225 ( -0.154229  0.152935 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.79193e-08 ( -1.27952e-08  1.35632e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 12.78 sec.
Hardness ratio (energy fluence ratio) = 1.63594987622

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

S(15-50 keV)  = 8.64835e-08
S(50-150 keV) = 1.7783728e-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 = 3.907181005366667E-01, IMY = 2.115322218977296E-02

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:
-239.624000 -1.088000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5732 -40.6120    2.9  32.0    2.1   1.6567   4.0    4.0	Vela X-1                      
 76.3940 -59.5473    2.7  31.5   84.7   2.6055   4.2 ------	UNKNOWN                       
108.0142  -1.0897    2.4  31.8  -95.2   2.4393   4.8 ------	UNKNOWN                       
108.4480   8.5142    2.9  41.2  -98.9   5.6319   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-1.088000 12.400000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4747 -40.4256    4.1  31.9    1.7   0.1389   2.8    8.1	Vela X-1                      
166.0850 -51.1320    3.2  53.2   17.5   0.6964   3.6 ------	UNKNOWN                       
122.3796 -37.0973    1.4  21.4   -3.1   0.3581   8.3 ------	UNKNOWN                       
 65.2175   2.1738    3.1  45.4 -164.0   0.2585   3.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
119.076600 962.475200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6246 -40.5388    2.2  10.9   34.0   4.8211   5.2    4.5	Vela X-1                      
170.3188 -60.6256   63.2  38.0   65.2   0.5293   0.2    0.2	Cen X-3                       
 63.5016 -68.9900    2.6  44.7  127.3  25.7424   4.5 ------	UNKNOWN                       
144.3597 -50.3445    2.9  20.6   58.5   4.5779   4.0 ------	UNKNOWN                       
170.2531 -13.2173    2.9  48.8   -4.9   6.4089   4.0 ------	UNKNOWN