GRB240109A: 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 14:06:46 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1207446
======================================================================

  Trigger: 01207446      Segment: 000

  BAT Trigger Time: 726465727.824   [s; MET]
      Trigger Stop: 726465727.888   [s; MET]
               UTC: 2024-01-09T04:01:35.126280    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 301.317618087209   Dec: 16.5775370553961  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.22
     Image Trigger?:     NO
     Rate S/N Ratio:     19.2613602842582  [ if not an image trigger ]
     Image S/N Ratio:    7.22

  Analysis Position:   [ source = BAT ]
    RA: 301.317618087209   Dec: 16.5775370553961  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 301.323643103237   Dec: 16.5400011479405  [deg; J2000]  
        { 20h 05m 17.7s , +16d 32' 24.0" }
         +/- 2.66294772947187 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.39407782174155 [arcmin] (formal 1-sigma fit error)
    SNR: 7.50684524818236
 
  Angular difference between the analysis and refined position is 2.278655 arcmin
 
  Partial Coding Fraction: 0.6796875    [ including projection effects ]

  Duration
     T90: 0.0800000429153442 +/- 0.0357770535203468
        Measured from: 0
                   to: 0.0800000429153442     [s; relative to TRIGTIME]
     T50: 0.0479999780654907 +/- 0.0226274628537407
        Measured from: 0.0160000324249268
                   to: 0.0640000104904175     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.444000005722046     
                   to: 0.555999994277954     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.0959999561309814     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.009025   0.017478   0.021543   0.004242
           0.003113   0.003729   0.003662   0.002303 [error]
 Peak      0.016911   0.035879   0.032511   0.003604
           0.008143   0.008397   0.007512   0.005826 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.096    0.000    0.096
T90     0.080    0.000    0.080
T50     0.048    0.016    0.064
Peak    1.000   -0.444    0.556
 
 
====== 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      -1.912    -0.348      0.328       -           -               -         1.92e-02     -5.23e-03          5.16e-03      72.180   57
CPL      1.599    -1.856      2.584       49.473      -8.342         8.424      1.43e+00     -1.43e+00          2.03e+01      61.070   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      -1.291     -0.442     0.456       -           -               -         5.90e-03     -1.57e-03          1.57e-03      89.660   57
CPL     -0.612     -1.072     2.285      104.815    -104.815      -104.815      1.28e-02     -1.28e-02          1.55e-01      89.130   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   3.47e-09  4.97e-09  5.27e-09  1.04e-08  1.69e-08  2.41e-08   erg/cm2
      90%_error_low -1.17e-09 -1.30e-09 -1.70e-09 -5.09e-09 -4.54e-09 -7.72e-09   erg/cm2
      90%_error_hi   1.23e-09  1.29e-09  1.70e-09  6.92e-09  4.56e-09  8.72e-09   erg/cm2
Peak flux       PL   1.99e-01  2.27e-01  1.85e-01  2.53e-01  7.03e-01  8.64e-01   ph/cm2/s
      90%_error_low -8.76e-02 -6.88e-02 -5.81e-02 -1.31e-01 -1.91e-01 -2.35e-01   ph/cm2/s
      90%_error_hi   1.00e-01  6.70e-02  5.71e-02  1.97e-01  1.91e-01  2.42e-01   ph/cm2/s
 
Fluence        CPL   2.34e-09  8.11e-09  7.35e-09  9.15e-10  1.87e-08  1.87e-08   erg/cm2
      90%_error_low -1.33e-09 -2.07e-09 -2.71e-09 -7.34e-10 -4.49e-09 -4.53e-09   erg/cm2
      90%_error_hi   1.43e-09  2.12e-09  2.78e-09  1.79e-09  4.50e-09  4.58e-09   erg/cm2
Peak flux      CPL   1.75e-01  2.41e-01  1.97e-01  1.25e-01  6.86e-01  7.39e-01   ph/cm2/s
      90%_error_low -1.01e-01 -7.74e-02 -6.50e-02 -1.25e-01 -1.95e-01 -2.34e-01   ph/cm2/s
      90%_error_hi   1.13e-01  8.38e-02  6.91e-02  1.85e-01  1.95e-01  2.72e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  301.3236    16.5400   0.0255    22.6196  -103.7447         0.0505713      7.507 TRIG_01207446                 
 
Foreground time interval of the image:
  0.000   0.096 (delta_t =   0.096 [sec])
Background time interval of the image:
-25.723   0.000 (delta_t =  25.723 [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    0.000 sec. to    0.096 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.91241     ( -0.346571   0.330065 )
Norm@50keV  : 1.92038E-02    ( -0.00522058   0.00516118 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   72.18     using 59 bins.
 Reduced chi-squared = 1.26632
# Null hypothesis probability of 8.48e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 0.096 sec: 2.77136 ( -0.73575  0.73785 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.69497e-08 ( -4.53996e-09  4.56136e-09 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.000 sec. to    0.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59907     ( -1.85911   2.58104 )
Epeak [keV] : 49.4730      ( -8.34399 8.42182 )
Norm@50keV  : 1.43128    ( -1.43636   20.3228 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.07     using 59 bins.
 Reduced chi-squared = 1.09054
# Null hypothesis probability of 2.99e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 0.096 sec: 2.99910 ( -0.74717  0.75077 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.86574e-08 ( -4.48704e-09  4.5038e-09 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.444 sec. to    0.556 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29062     ( -0.442439   0.456198 )
Norm@50keV  : 5.89946E-03    ( -0.00156841   0.00156627 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   89.66     using 59 bins.
 Reduced chi-squared = 1.57298
# Null hypothesis probability of 3.73e-03 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.702630 ( -0.190526  0.191394 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.84386e-08 ( -1.69212e-08  1.72708e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.444 sec. to    0.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.612139     ( -1.07192   2.2849 )
Epeak [keV] : 104.815      ( -104.817 -104.817 )
Norm@50keV  : 1.28390E-02    ( -0.0128386   0.155475 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   89.13     using 59 bins.
 Reduced chi-squared = 1.59161
# Null hypothesis probability of 3.20e-03 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.686311 ( -0.194672  0.195196 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.58097e-08 ( -1.83297e-08  1.83879e-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 = -9.899695004969376E-02, IMY = 4.047305283342757E-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:
-25.723400 0.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5578  35.2334   10.9  39.7  -11.6   0.1072   1.1    8.2	Her X-1                       
288.9176  10.8839  135.5  31.4  -81.4   0.0090   0.1    7.9	GRS 1915+105                  
299.6583  35.1290    3.3   5.6  -63.9   0.2231   3.5    5.5	Cyg X-1                       
308.1037  40.7900    2.8   3.1  120.8   0.2624   4.2    9.8	Cyg X-3                       
326.1189  38.1716   29.2  16.7  153.6   0.0257   0.4    9.3	Cyg X-2                       
330.0797  25.7430    2.4  25.0 -178.0   0.3487   4.9 ------	UNKNOWN                       
267.6620   8.7374    2.4  44.9  -54.7   1.0996   4.9 ------	UNKNOWN                       

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

Time interval of the image:
0.000000 0.096000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4015  35.3184   26.7  39.8  -11.4   0.0032   0.4    3.1	Her X-1                       
288.8947  10.9283    4.8  31.4  -81.3  -0.0209  -2.4    5.8	GRS 1915+105                  
299.7657  35.1589    4.8   5.5  -64.3   0.0126   2.4    9.0	Cyg X-1                       
308.1504  41.1036    4.5   3.4  116.8  -0.0130  -2.5    9.2	Cyg X-3                       
325.9142  38.2915    0.0  16.5  153.2   0.0029   0.6   12.3	Cyg X-2                       
357.0132  16.5884    2.2  50.5  168.6   0.0864   5.3 ------	UNKNOWN                       
350.4110  11.4653    2.1  48.9  179.1   0.0634   5.5 ------	UNKNOWN                       
242.5143  25.7332    2.1  53.2  -17.1   0.0895   5.5 ------	UNKNOWN                       
301.3236  16.5400    1.5  22.6 -103.7   0.0506   7.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
782.076600 962.308500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 86.1839   3.6326    2.4  39.3   93.9   4.2396   4.8 ------	UNKNOWN                       
122.6322 -36.9029    2.9  53.9  167.1   4.6167   4.0 ------	UNKNOWN                       
 45.8161   6.8371    3.6  35.5   25.0   1.3165   3.2 ------	UNKNOWN                       
 67.5276 -59.4389    2.5  33.8 -138.3   1.6109   4.6 ------	UNKNOWN