GRB240101B: 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 14:10:44 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1205744
======================================================================

  Trigger: 01205744      Segment: 000

  BAT Trigger Time: 725833572.032   [s; MET]
      Trigger Stop: 725833588.416   [s; MET]
               UTC: 2024-01-01T20:25:39.377680    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 352.051640079299   Dec: 51.6452299783594  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.41
     Image Trigger?:     NO
     Rate S/N Ratio:     12  [ if not an image trigger ]
     Image S/N Ratio:    7.41

  Analysis Position:   [ source = BAT ]
    RA: 352.051640079299   Dec: 51.6452299783594  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 352.092359847189   Dec: 51.6206224867351  [deg; J2000]  
        { 23h 28m 22.2s , +51d 37' 14.2" }
         +/- 2.35315757825358 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.17917566143903 [arcmin] (formal 1-sigma fit error)
    SNR: 8.95753193108251
 
  Angular difference between the analysis and refined position is 2.116509 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 134.015999913216 +/- 39.0079343766904
        Measured from: -50.7439999580383
                   to: 83.2719999551773     [s; relative to TRIGTIME]
     T50: 39.0399998426437 +/- 37.7830438786141
        Measured from: -7.41599988937378
                   to: 31.62399995327     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 10.2920000553131     
                   to: 11.2920000553131     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -54.5839999914169     
                   to: 107.527999997139     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.388143   0.586863   0.395710   0.031524
           0.078112   0.079947   0.068850   0.061542 [error]
 Peak      0.018241   0.020854   0.015722   0.001233
           0.006573   0.006574   0.005502   0.004889 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  162.112  -54.584  107.528
T90   134.016  -50.744   83.272
T50    39.040   -7.416   31.624
Peak    1.000   10.292   11.292
 
 
====== 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      -1.560    -0.276      0.267       -           -               -         5.57e-04     -9.41e-05          9.24e-05      57.530   57
CPL     -0.886    -0.876      1.438       77.832     -30.892       -77.832      1.27e-03     -7.85e-04          5.90e-03      56.450   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      -1.674     -0.599     0.541       -           -               -         3.63e-03     -1.29e-03          1.22e-03      63.070   57
CPL     -0.882     -1.347     5.532       64.827     -51.113       -64.827      9.71e-03     -9.71e-03          4.90e+00      62.860   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   1.22e-07  2.16e-07  2.93e-07  8.19e-07  8.49e-07  1.45e-06   erg/cm2
      90%_error_low -2.90e-08 -3.40e-08 -6.51e-08 -3.22e-07 -1.54e-07 -3.91e-07   erg/cm2
      90%_error_hi   3.05e-08  3.39e-08  6.51e-08  4.38e-07  1.58e-07  4.86e-07   erg/cm2
Peak flux       PL   1.77e-01  1.60e-01  1.01e-01  9.63e-02  4.78e-01  5.34e-01   ph/cm2/s
      90%_error_low -7.83e-02 -4.92e-02 -4.47e-02 -6.37e-02 -1.45e-01 -1.65e-01   ph/cm2/s
      90%_error_hi   8.65e-02  4.89e-02  4.47e-02  1.11e-01  1.45e-01  1.68e-01   ph/cm2/s
 
Fluence        CPL   1.11e-07  2.33e-07  2.99e-07  3.05e-07  8.00e-07  9.49e-07   erg/cm2
      90%_error_low -3.49e-08 -4.37e-08 -7.20e-08 -2.36e-07 -1.69e-07 -2.97e-07   erg/cm2
      90%_error_hi   3.49e-08  4.67e-08  7.20e-08  6.30e-07  1.76e-07  6.72e-07   erg/cm2
Peak flux      CPL   1.58e-01  1.74e-01  1.04e-01  3.90e-02  4.63e-01  4.75e-01   ph/cm2/s
      90%_error_low -1.58e-01 -6.30e-02 -4.97e-02 -3.90e-02 -1.64e-01 -1.76e-01   ph/cm2/s
      90%_error_hi   1.44e-01  7.30e-02  5.13e-02  7.61e-02  1.54e-01  2.10e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  352.0924    51.6206   0.0215     2.9025   -74.2657         1.5119953      8.958 TRIG_01205744                 
 
Foreground time interval of the image:
-54.584  73.069 (delta_t = 127.653 [sec])
Background time interval of the image:
-239.032 -54.584 (delta_t = 184.448 [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  -54.584 sec. to  107.528 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56026     ( -0.275619   0.266988 )
Norm@50keV  : 5.56837E-04    ( -9.40919e-05   9.24274e-05 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.53     using 59 bins.
 Reduced chi-squared = 1.0093
# Null hypothesis probability of 4.56e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 162.1 sec: 7.07055E-02 ( -0.011023  0.0110286 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.48639e-07 ( -1.54425e-07  1.57859e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -54.584 sec. to  107.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.88598     ( -0.876441   1.43802 )
Epeak [keV] : 77.8317      ( -30.8904 -77.8303 )
Norm@50keV  : 1.26955E-03    ( -0.000784587   0.00589663 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.45     using 59 bins.
 Reduced chi-squared = 1.00804
# Null hypothesis probability of 4.58e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 162.1 sec: 6.88549E-02 ( -0.0115095  0.0114482 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.99951e-07 ( -1.68597e-07  1.75831e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   10.292 sec. to   11.292 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.67362     ( -0.598564   0.540827 )
Norm@50keV  : 3.63079E-03    ( -0.00128986   0.00121586 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.07     using 59 bins.
 Reduced chi-squared = 1.10649
# Null hypothesis probability of 2.70e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.477869 ( -0.14495  0.145051 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.36969e-08 ( -1.19974e-08  1.25849e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   10.292 sec. to   11.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.88165     ( -1.3525   5.52682 )
Epeak [keV] : 64.8266      ( -50.9479 -64.6615 )
Norm@50keV  : 9.71273E-03    ( -0.00982107   4.8984 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.86     using 59 bins.
 Reduced chi-squared = 1.1225
# Null hypothesis probability of 2.46e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.462695 ( -0.164159  0.154076 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.14e-08 ( -1.21474e-08  1.37586e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 134.016 sec.
Hardness ratio (energy fluence ratio) = 1.35640692805

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

S(15-50 keV)  = 3.37979e-07
S(50-150 keV) = 5.106659e-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 = 1.374898082235024E-02, IMY = 4.880133904148388E-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:
-239.032000 -54.584000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1060  40.9718    3.1  34.5  -72.5   1.8954   3.7    1.2	Cyg X-3                       
326.0938  38.4462    7.2  25.1  -93.8   0.5852   1.6    8.3	Cyg X-2                       
 39.2080  18.0883    2.2  47.3  135.2   7.4700   5.3 ------	UNKNOWN                       
208.7426  69.2488    2.9  56.8    3.1   5.1057   4.0 ------	UNKNOWN                       
341.6547  73.6838    3.2  22.9    5.1   1.0646   3.6 ------	UNKNOWN                       

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

Time interval of the image:
-54.584000 73.068590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0687  41.1115    3.6  34.5  -72.3   0.9916   3.2    9.7	Cyg X-3                       
326.2894  38.3976    4.0  25.0  -94.1   0.6546   2.9    7.2	Cyg X-2                       
 16.1719  60.8074    1.9  14.0   58.1   0.9977   6.0 ------	UNKNOWN                       
214.3395  76.3957    2.2  49.6    5.2   2.4672   5.3 ------	UNKNOWN                       
352.0924  51.6207    1.3   2.9  -74.3   1.5118   9.0 ------	UNKNOWN                       
293.5263  40.2801    2.2  43.9  -63.1   3.4301   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
108.668590 963.118000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5960  35.1459    4.0  40.5  -63.4   8.0929   2.9    3.4	Cyg X-1                       
308.1808  40.9624    2.6  31.6  -62.7   6.6128   4.4    3.2	Cyg X-3                       
326.4003  38.3615   12.7  22.3  -87.0   1.2283   0.9   11.0	Cyg X-2                       
228.6406  63.3949    4.0  56.8    3.0  11.4828   2.9 ------	UNKNOWN                       
277.5090  53.5209    2.3  43.2  -27.3   9.4969   4.9 ------	UNKNOWN