GRB240730A: 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 15:05:26 EDT 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1245636
======================================================================

  Trigger: 01245636      Segment: 000

  BAT Trigger Time: 744018760   [s; MET]
      Trigger Stop: 744018824   [s; MET]
               UTC: 2024-07-30T07:52:06.099900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 37.8292169789855   Dec: 59.074165988813  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.74
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.74

  Analysis Position:   [ source = BAT ]
    RA: 37.8292169789855   Dec: 59.074165988813  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 37.8430229600022   Dec: 59.0466568256131  [deg; J2000]  
        { 02h 31m 22.3s , +59d 02' 48.0" }
         +/- 1.91846062143431 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.754470922682351 [arcmin] (formal 1-sigma fit error)
    SNR: 11.9922304830216
 
  Angular difference between the analysis and refined position is 1.704610 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 50.1159999370575 +/- 7.96346981524784
        Measured from: -4.05599999427795
                   to: 46.0599999427795     [s; relative to TRIGTIME]
     T50: 29.5559998750687 +/- 5.99895888199906
        Measured from: 6.30400002002716
                   to: 35.8599998950958     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.79999995231628     
                   to: 6.79999995231628     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.69599997997284     
                   to: 53.2599999904633     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.321685   0.442729   0.337436   0.013889
           0.045475   0.046856   0.039740   0.033131 [error]
 Peak      0.019829   0.019754   0.011263   0.000272
           0.005995   0.006082   0.005227   0.004341 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   59.956   -6.696   53.260
T90    50.116   -4.056   46.060
T50    29.556    6.304   35.860
Peak    1.000    5.800    6.800
 
 
====== 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      -1.491    -0.195      0.192       -           -               -         1.21e-03     -1.45e-04          1.44e-04      55.710   57
CPL     -0.644    -0.796      0.980       77.547     -20.386       300.083      3.32e-03     -2.00e-03          7.03e-03      52.370   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      -1.861     -0.761     0.613       -           -               -         2.73e-03     -1.27e-03          1.16e-03      66.400   57
CPL     -1.453     -1.255     2.929       59.825     -59.234       -59.825      4.61e-03     -4.61e-03          2.26e-01      66.290   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   9.18e-08  1.69e-07  2.41e-07  7.23e-07  6.88e-07  1.23e-06   erg/cm2
      90%_error_low -1.67e-08 -2.01e-08 -3.73e-08 -2.09e-07 -9.02e-08 -2.45e-07   erg/cm2
      90%_error_hi   1.74e-08  2.00e-08  3.73e-08  2.59e-07  9.14e-08  2.85e-07   erg/cm2
Peak flux       PL   1.59e-01  1.29e-01  7.11e-02  5.75e-02  3.85e-01  4.17e-01   ph/cm2/s
      90%_error_low -7.36e-02 -4.52e-02 -4.01e-02 -5.75e-02 -1.34e-01 -1.49e-01   ph/cm2/s
      90%_error_hi   7.94e-02  4.50e-02  4.17e-02  8.69e-02  1.34e-01  1.53e-01   ph/cm2/s
 
Fluence        CPL   8.08e-08  1.86e-07  2.51e-07  2.31e-07  6.44e-07  7.49e-07   erg/cm2
      90%_error_low -2.00e-08 -2.54e-08 -4.20e-08 -1.43e-07 -9.72e-08 -1.73e-07   erg/cm2
      90%_error_hi   2.02e-08  2.65e-08  4.23e-08  4.34e-07  1.00e-07  4.32e-07   erg/cm2
Peak flux      CPL   1.52e-01  1.36e-01  7.24e-02  3.43e-02  3.81e-01  3.95e-01   ph/cm2/s
      90%_error_low -1.52e-01 -1.00e-01 -7.24e-02 -3.43e-02 -1.34e-01 -1.45e-01   ph/cm2/s
      90%_error_hi   8.21e-02  5.97e-02  4.64e-02  7.27e-02  1.35e-01  1.67e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   37.8430    59.0467   0.0160     8.9224   -99.6067         1.1422355     11.992 TRIG_01245636                 
 
Foreground time interval of the image:
 -6.696  53.260 (delta_t =  59.956 [sec])
Background time interval of the image:
-209.499  -6.696 (delta_t = 202.803 [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   -6.696 sec. to   53.260 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.49142     ( -0.194856   0.192386 )
Norm@50keV  : 1.20809E-03    ( -0.000144777   0.000143681 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.71     using 59 bins.
 Reduced chi-squared = 0.977368
# Null hypothesis probability of 5.23e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 59.96 sec: 0.150475 ( -0.017406  0.017421 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.88227e-07 ( -9.02122e-08  9.14264e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -6.696 sec. to   53.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.644144     ( -0.795744   0.980129 )
Epeak [keV] : 77.5468      ( -20.3857 300.083 )
Norm@50keV  : 3.32000E-03    ( -0.00200467   0.00703117 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.37     using 59 bins.
 Reduced chi-squared = 0.935179
# Null hypothesis probability of 6.13e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 59.96 sec: 0.145603 ( -0.018091  0.018049 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.43904e-07 ( -9.72012e-08  1.00008e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    5.800 sec. to    6.800 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.86095     ( -0.761324   0.61334 )
Norm@50keV  : 2.72566E-03    ( -0.00126984   0.00116489 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   66.40     using 59 bins.
 Reduced chi-squared = 1.16491
# Null hypothesis probability of 1.85e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.384859 ( -0.133575  0.133593 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.50634e-08 ( -1.0682e-08  1.14666e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    5.800 sec. to    6.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45348     ( -1.2529   2.93118 )
Epeak [keV] : 59.8252      ( -59.3191 -59.9106 )
Norm@50keV  : 4.61200E-03    ( -0.00460228   0.22619 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   66.29     using 59 bins.
 Reduced chi-squared = 1.18375
# Null hypothesis probability of 1.63e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.381262 ( -0.134072  0.134698 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.43187e-08 ( -1.07108e-08  1.25689e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 50.116 sec.
Hardness ratio (energy fluence ratio) = 1.42268823472

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

S(15-50 keV)  = 2.6124061e-07
S(50-150 keV) = 4.269913e-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 = -2.620016867665400E-02, IMY = 1.547951701735723E-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:
-209.499400 -6.696000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1163  38.4262    4.4  41.7  120.9  -4.0659  -2.6    6.8	Cyg X-2                       
 12.1897  18.3550    2.7  37.0   47.6   2.5405   4.3 ------	UNKNOWN                       
 37.2527  14.5815    2.8  41.0    9.0   1.8758   4.2 ------	UNKNOWN                       
213.5395  77.1245    2.3  48.5 -154.2   3.1264   5.0 ------	UNKNOWN                       
105.6884  60.1345    2.7  41.7 -103.7   5.3262   4.2 ------	UNKNOWN                       

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

Time interval of the image:
-6.696000 53.260000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.0261  38.3854    7.8  41.8  120.9  -0.4985  -1.5    7.8	Cyg X-2                       
316.5715  41.1919    2.4  45.4  130.9   1.9818   4.8 ------	UNKNOWN                       
 37.8430  59.0467    1.0   8.9  -99.6   1.1422  12.0 ------	UNKNOWN                       
 60.0404   8.8620    2.1  53.6  -17.4   1.5918   5.5 ------	UNKNOWN                       
 63.5498   5.1777    2.4  58.5  -19.3   3.0410   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
111.700600 963.088600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
356.4789  40.6631    2.4  31.6   84.7  10.1592   4.7 ------	UNKNOWN                       
  0.0413  37.8611    3.4  32.1   77.3   7.3294   3.4 ------	UNKNOWN                       
339.0380  58.8594    2.1  29.3  127.2   9.0144   5.4 ------	UNKNOWN                       
 39.7223  18.1418    2.9  40.9    9.0   6.2670   4.1 ------	UNKNOWN                       
142.6493  60.0692    3.3  47.3 -127.3  17.6262   3.6 ------	UNKNOWN