GRB240102A: 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 Mar  9 14:09:13 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1205899
======================================================================

  Trigger: 01205899      Segment: 000

  BAT Trigger Time: 725909728   [s; MET]
      Trigger Stop: 725909792   [s; MET]
               UTC: 2024-01-02T17:34:55.340440    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 96.845998823845   Dec: -20.024026353982  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.96
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.96

  Analysis Position:   [ source = BAT ]
    RA: 96.845998823845   Dec: -20.024026353982  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 96.8668054176556   Dec: -20.0413327385085  [deg; J2000]  
        { 06h 27m 28.0s , -20d 02' 28.8" }
         +/- 1.88727914094156 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.736121691636517 [arcmin] (formal 1-sigma fit error)
    SNR: 12.2762790441697
 
  Angular difference between the analysis and refined position is 1.566477 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 114.304000020027 +/- 35.9745368080131
        Measured from: 11.3680000305176
                   to: 125.672000050545     [s; relative to TRIGTIME]
     T50: 46.2400000095367 +/- 13.9429443625608
        Measured from: 25.1119999885559
                   to: 71.3519999980927     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 65.0039999485016     
                   to: 66.0039999485016     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 7.83200001716614     
                   to: 133.496000051498     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.616505   0.665356   0.296872   0.027409
           0.068751   0.070246   0.058888   0.049020 [error]
 Peak      0.023489   0.013223   0.012794   0.001930
           0.006366   0.006127   0.005128   0.004391 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  125.664    7.832  133.496
T90   114.304   11.368  125.672
T50    46.240   25.112   71.352
Peak    1.000   65.004   66.004
 
 
====== 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      -1.982    -0.233      0.218       -           -               -         7.02e-04     -1.13e-04          1.10e-04      62.100   57
CPL     -0.882    -1.006      1.234       40.761     -16.828        25.935      3.15e-03     -3.15e-03          1.39e-02      58.660   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      -1.805     -0.836     0.721       -           -               -         2.69e-03     -1.29e-03          1.15e-03      51.940   57
CPL     -1.793     -4.523     2.257     9486.300    -9486.290      -9486.300      2.73e-03     -2.73e-03          4.17e-02      51.940   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   1.78e-07  2.44e-07  2.47e-07  4.54e-07  8.13e-07  1.12e-06   erg/cm2
      90%_error_low -2.89e-08 -3.03e-08 -5.24e-08 -1.64e-07 -1.22e-07 -2.32e-07   erg/cm2
      90%_error_hi   2.95e-08  3.01e-08  5.40e-08  2.16e-07  1.25e-07  2.73e-07   erg/cm2
Peak flux       PL   1.49e-01  1.25e-01  7.15e-02  6.08e-02  3.72e-01  4.06e-01   ph/cm2/s
      90%_error_low -7.95e-02 -4.57e-02 -7.15e-02 -6.08e-02 -1.36e-01 -1.51e-01   ph/cm2/s
      90%_error_hi   8.67e-02  4.57e-02  4.23e-02  1.04e-01  1.36e-01  1.54e-01   ph/cm2/s
 
Fluence        CPL   1.65e-07  2.78e-07  2.27e-07  8.35e-08  7.31e-07  7.53e-07   erg/cm2
      90%_error_low -3.30e-08 -4.32e-08 -6.67e-08 -6.46e-08 -1.22e-07 -1.41e-07   erg/cm2
      90%_error_hi   3.26e-08  4.42e-08  6.38e-08  2.97e-07  1.40e-07  3.16e-07   erg/cm2
Peak flux      CPL   1.52e-01  1.24e-01  7.02e-02  6.88e-02  3.72e-01  4.07e-01   ph/cm2/s
      90%_error_low -8.53e-02 -4.48e-02 -7.02e-02     N/A   -1.37e-01 -1.56e-01   ph/cm2/s
      90%_error_hi   6.48e-02  5.57e-02  3.27e-02     N/A    1.36e-01  1.49e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   96.8668   -20.0413   0.0156     4.6735   -40.1182         1.2491770     12.276 TRIG_01205899                 
 
Foreground time interval of the image:
  7.832  72.701 (delta_t =  64.869 [sec])
Background time interval of the image:
-239.000   7.832 (delta_t = 246.832 [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    7.832 sec. to  133.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98196     ( -0.233332   0.217865 )
Norm@50keV  : 7.02250E-04    ( -0.000112606   0.000109951 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.10     using 59 bins.
 Reduced chi-squared = 1.08947
# Null hypothesis probability of 3.00e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 125.7 sec: 0.104481 ( -0.0127102  0.012709 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.13478e-07 ( -1.21941e-07  1.25349e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    7.832 sec. to  133.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.881953     ( -1.00584   1.23367 )
Epeak [keV] : 40.7607      ( -16.8275 25.9351 )
Norm@50keV  : 3.14996E-03    ( -0.00314993   0.0138778 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.66     using 59 bins.
 Reduced chi-squared = 1.0475
# Null hypothesis probability of 3.78e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 125.7 sec: 0.101048 ( -0.0129115  0.012997 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.30861e-07 ( -1.22383e-07  1.39672e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   65.004 sec. to   66.004 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.80496     ( -0.83637   0.7206 )
Norm@50keV  : 2.69233E-03    ( -0.00128861   0.00115014 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.94     using 59 bins.
 Reduced chi-squared = 0.911228
# Null hypothesis probability of 6.65e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.371733 ( -0.136076  0.136146 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.47851e-08 ( -1.09067e-08  1.16131e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   65.004 sec. to   66.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.16325     ( -4.51821   2.26183 )
Epeak [keV] : 64.2172      ( -9999.26 -9999.27 )
Norm@50keV  : 1.71110E-03    ( -0.00170807   0.0426816 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.73     using 59 bins.
 Reduced chi-squared = 0.92375
# Null hypothesis probability of 6.37e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.372475 ( -0.137222  0.135788 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.95839e-08 ( -1.33234e-08  1.1582e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 114.304 sec.
Hardness ratio (energy fluence ratio) = 1.01265152349

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

S(15-50 keV)  = 4.21132e-07
S(50-150 keV) = 3.923497e-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 = 6.251576326169320E-02, IMY = 5.267702996374011E-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:
-239.000000 7.832000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6501  22.0317    1.7  43.9   49.3   8.7820   6.9    1.4	Crab                          
135.5086 -40.5354    1.4  36.8 -152.0   3.9398   8.0    1.5	Vela X-1                      
148.3825   1.1164    2.5  50.1  145.8   8.6057   4.6 ------	UNKNOWN                       
 79.3905 -14.3963    2.8  21.5   -9.6   1.5818   4.1 ------	UNKNOWN                       
 98.8866 -29.0207    2.5  11.0  -94.9   1.6449   4.6 ------	UNKNOWN                       
 41.6138 -15.9787    2.2  57.0  -24.2   9.0041   5.2 ------	UNKNOWN                       
135.8459 -59.4945    2.9  48.1 -129.3   6.5406   4.0 ------	UNKNOWN                       

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

Time interval of the image:
7.832000 72.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6122  22.1306    5.4  44.0   49.3  -0.8009  -2.2    7.1	Crab                          
135.4844 -40.6028    4.5  36.8 -151.9  -0.3447  -2.6    3.5	Vela X-1                      
 96.8670 -20.0414    0.9   4.7  -40.1   1.2493  12.3 ------	UNKNOWN                       
 50.8830 -12.4634    2.5  48.9  -17.4   1.1118   4.7 ------	UNKNOWN                       
 52.0145 -17.3845    2.4  46.9  -23.7   0.9834   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
111.100600 963.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5272 -40.5198    1.8  38.8 -147.3  11.5471   6.4    2.1	Vela X-1                      
 94.0632  11.9191    4.6  32.1   77.0   6.2389   2.5 ------	UNKNOWN                       
117.1077   1.4607    2.9  29.3  127.3   7.1407   4.0 ------	UNKNOWN                       
 48.4575 -19.2034    3.2  45.4  -15.5   7.1337   3.6 ------	UNKNOWN                       
140.2708 -55.6603    3.1  48.1 -129.3  19.5314   3.7 ------	UNKNOWN