GRB200729A: 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: Wed Sep  9 22:55:30 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger984929
======================================================================

  Trigger: 00984929      Segment: 000

  BAT Trigger Time: 617744310.464   [s; MET]
      Trigger Stop: 617744318.656   [s; MET]
               UTC: 2020-07-29T19:38:05.095420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 184.374725606312   Dec: 45.5823142434638  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.81
     Image Trigger?:     NO
     Rate S/N Ratio:     9.59166304662544  [ if not an image trigger ]
     Image S/N Ratio:    8.81

  Analysis Position:   [ source = BAT ]
    RA: 184.374725606312   Dec: 45.5823142434638  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 184.360293791043   Dec: 45.5705349045416  [deg; J2000]  
        { 12h 17m 26.5s , +45d 34' 13.9" }
         +/- 2.31868852413339 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.27353682534939 [arcmin] (formal 1-sigma fit error)
    SNR: 9.14836544638276
 
  Angular difference between the analysis and refined position is 0.931057 arcmin
 
  Partial Coding Fraction: 0.4609375    [ including projection effects ]

  Duration
     T90: 122 +/- 34.2344855372474
        Measured from: 1.53600001335144
                   to: 123.536000013351     [s; relative to TRIGTIME]
     T50: 57 +/- 24.8243831746128
        Measured from: 7.53600001335144
                   to: 64.5360000133514     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.53600001335144     
                   to: 6.53600001335144     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.53600001335144     
                   to: 136.536000013351     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.288433   0.584691   0.903058   0.193098
           0.106651   0.111376   0.099071   0.087403 [error]
 Peak      0.026092   0.023619   0.035718   0.025011
           0.011558   0.011721   0.011197   0.009379 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  136.000    0.536  136.536
T90   122.000    1.536  123.536
T50    57.000    7.536   64.536
Peak    1.000    5.536    6.536
 
 
====== 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      -0.923    -0.260      0.278       -           -               -         1.05e-03     -1.72e-04          1.69e-04      41.610   57
CPL     -0.001    -1.025      1.638      135.977     -48.998      -135.977      2.46e-03     -1.52e-03          7.02e-03      39.860   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      -0.721     -0.610     0.773       -           -               -         6.41e-03     -2.86e-03          2.59e-03      50.150   57
CPL     -0.455      0.455     2.663      406.066    -406.066      -406.066      7.97e-03     -4.26e-03          1.36e-01      50.120   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   1.07e-07  2.80e-07  5.91e-07  3.21e-06  1.59e-06  4.19e-06   erg/cm2
      90%_error_low -3.41e-08 -5.83e-08 -9.16e-08 -1.01e-06 -2.45e-07 -1.05e-06   erg/cm2
      90%_error_hi   3.88e-08  5.73e-08  9.09e-08  1.32e-06  2.45e-07  1.32e-06   erg/cm2
Peak flux       PL   1.26e-01  2.02e-01  2.45e-01  5.83e-01  7.40e-01  1.16e+00   ph/cm2/s
      90%_error_low -9.02e-02 -1.12e-01 -8.25e-02 -3.26e-01 -2.84e-01 -3.89e-01   ph/cm2/s
      90%_error_hi   1.37e-01  1.15e-01  8.23e-02  5.57e-01  2.95e-01  4.56e-01   ph/cm2/s
 
Fluence        CPL   7.94e-08  2.85e-07  6.54e-07  1.32e-06  1.55e-06  2.33e-06   erg/cm2
      90%_error_low -4.31e-08 -6.71e-08 -1.10e-07 -8.01e-07 -2.59e-07 -8.30e-07   erg/cm2
      90%_error_hi   5.09e-08  6.47e-08  1.25e-07  2.28e-06  2.56e-07  2.29e-06   erg/cm2
Peak flux      CPL   1.13e-01  2.00e-01  2.54e-01  5.88e-01  7.32e-01  1.14e+00   ph/cm2/s
      90%_error_low -1.13e-01 -2.00e-01 -9.04e-02 -5.88e-01 -2.90e-01 -6.32e-01   ph/cm2/s
      90%_error_hi   1.47e-01  1.19e-01  1.13e-01  5.21e-01  2.90e-01  4.18e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  184.3603    45.5705   0.0210    41.5424  -158.8771         1.5742161      9.148 TRIG_00984929                 
 
Foreground time interval of the image:
  0.536  50.237 (delta_t =  49.701 [sec])
Background time interval of the image:
-239.464   0.536 (delta_t = 240.000 [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    0.536 sec. to  136.536 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.922876     ( -0.259623   0.278402 )
Norm@50keV  : 1.05344E-03    ( -0.00017188   0.00016851 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   41.61     using 59 bins.
 Reduced chi-squared = 0.73
# Null hypothesis probability of 9.37e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 136 sec: 0.120948 ( -0.019614  0.01984 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.59396e-06 ( -2.44535e-07  2.45155e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.536 sec. to  136.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.000621513     ( -1.02511   1.6384 )
Epeak [keV] : 135.977      ( -48.9967 -135.976 )
Norm@50keV  : 2.45608E-03    ( -0.00151618   0.0070187 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   39.86     using 59 bins.
 Reduced chi-squared = 0.711786
# Null hypothesis probability of 9.49e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 136 sec: 0.115562 ( -0.0208783  0.021037 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.5485e-06 ( -2.59152e-07  2.55805e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    5.536 sec. to    6.536 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.721122     ( -0.609661   0.773142 )
Norm@50keV  : 6.41471E-03    ( -0.00285567   0.00258868 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.15     using 59 bins.
 Reduced chi-squared = 0.879825
# Null hypothesis probability of 7.28e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.740310 ( -0.283578  0.29512 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.75711e-08 ( -2.61561e-08  2.61626e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    5.536 sec. to    6.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.454702     ( 0.454702   2.66288 )
Epeak [keV] : 406.066      ( -406.066 -406.066 )
Norm@50keV  : 7.97030E-03    ( -0.00426102   0.135579 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.12     using 59 bins.
 Reduced chi-squared = 0.895
# Null hypothesis probability of 6.96e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.731593 ( -0.290053  0.290277 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.75658e-08 ( -2.63115e-08  2.62205e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 122.0 sec.
Hardness ratio (energy fluence ratio) = 2.10984217424

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

S(15-50 keV)  = 3.871155e-07
S(50-150 keV) = 1.2068456e-06

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 = -8.265102105242641E-01, IMY = 3.193040653880231E-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:
-239.464000 0.536000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6321  22.0326    0.9  47.9  -22.6   8.6647  12.7    1.1	Crab                          
 39.9577  34.6707    3.1  52.4   30.1   5.3551   3.7 ------	UNKNOWN                       
230.0987  48.7078    2.8  55.6  163.9   7.3923   4.1 ------	UNKNOWN                       
 65.0791  20.7616    2.8  54.9   -2.3   3.3060   4.2 ------	UNKNOWN                       
212.5579  38.6620    3.0  58.5 -177.2   7.1978   3.8 ------	UNKNOWN                       
 84.6986  26.3352    2.6  43.5  -22.2   2.1920   4.4 ------	UNKNOWN                       
175.9560  41.0103    3.0  41.8 -147.4   2.1749   3.8 ------	UNKNOWN                       
165.5198  32.7117    2.2  44.8 -130.8   4.4020   5.4 ------	UNKNOWN                       

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

Time interval of the image:
0.536000 50.236600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5604  21.8872    5.1  48.0  -22.6  -0.5160  -2.3    8.6	Crab                          
184.3603  45.5705    1.3  41.5 -158.9   1.5747   9.1 ------	UNKNOWN                       
 96.2691  31.9509    2.2  35.4  -35.3   0.7478   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
123.636600 962.562500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
230.2480  24.6030    2.2  42.2  116.3  20.6703   5.3 ------	UNKNOWN                       
230.3736  46.1016    4.1  31.6   84.6   5.1286   2.9 ------	UNKNOWN                       
165.2533  66.6332    3.1  23.3   -6.8   3.2313   3.7 ------	UNKNOWN                       
182.8619  -9.1610    2.6  54.8 -165.7  15.1613   4.5 ------	UNKNOWN                       
172.0530  -0.0563    3.1  47.0 -150.6   8.8938   3.8 ------	UNKNOWN