GRB200411A: 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 v2.47
    Process Start Time: Mon May 18 14:21:07 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger965784
======================================================================

  Trigger: 00965784      Segment: 000

  BAT Trigger Time: 608272167.208   [s; MET]
      Trigger Stop: 608272167.272   [s; MET]
               UTC: 2020-04-11T04:29:02.456140    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 47.6594073722997   Dec: -52.3144792843281  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.06
     Image Trigger?:     NO
     Rate S/N Ratio:     34.9714169000914  [ if not an image trigger ]
     Image S/N Ratio:    10.06

  Analysis Position:   [ source = BAT ]
    RA: 47.6594073722997   Dec: -52.3144792843281  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 47.6861106494885   Dec: -52.3204094709807  [deg; J2000]  
        { 03h 10m 44.7s , -52d 19' 13.5" }
         +/- 1.63427193966214 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.80757710983536 [arcmin] (formal 1-sigma fit error)
    SNR: 15.0788890519473
 
  Angular difference between the analysis and refined position is 1.042030 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 0.21999990940094 +/- 0.0447213169003838
        Measured from: -0.00399994850158691
                   to: 0.215999960899353     [s; relative to TRIGTIME]
     T50: 0.119999885559082 +/- 0.017888473448218
        Measured from: 0.0320000648498535
                   to: 0.151999950408936     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.383999943733215     
                   to: 0.616000056266785     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0199999809265137     
                   to: 0.248000025749207     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.025501   0.043716   0.048313   0.017328
           0.004274   0.004980   0.004912   0.003832 [error]
 Peak      0.026451   0.056011   0.055972   0.022742
           0.007074   0.007774   0.007162   0.006128 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.268   -0.020    0.248
T90     0.220   -0.004    0.216
T50     0.120    0.032    0.152
Peak    1.000   -0.384    0.616
 
 
====== 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      -0.946    -0.191      0.197       -           -               -         2.91e-02     -3.46e-03          3.45e-03      71.720   57
CPL     -0.225    -0.771      0.938      133.387     -47.983      -133.387      6.42e-02     -3.58e-02          1.06e-01      69.200   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      -0.922     -0.250     0.266       -           -               -         9.48e-03     -1.45e-03          1.44e-03      64.150   57
CPL     -0.440     -0.607     1.189      178.222    -178.222      -178.222      1.59e-02     -7.61e-03          3.72e-02      63.440   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   5.95e-09  1.54e-08  3.19e-08  1.69e-07  8.62e-08  2.22e-07   erg/cm2
      90%_error_low -1.29e-09 -2.14e-09 -4.27e-09 -4.47e-08 -1.13e-08 -4.79e-08   erg/cm2
      90%_error_hi   1.38e-09  2.11e-09  4.23e-09  5.49e-08  1.14e-08  5.68e-08   erg/cm2
Peak flux       PL   2.25e-01  3.20e-01  3.38e-01  6.58e-01  1.09e+00  1.54e+00   ph/cm2/s
      90%_error_low -6.62e-02 -6.16e-02 -5.42e-02 -2.00e-01 -1.66e-01 -2.53e-01   ph/cm2/s
      90%_error_hi   7.30e-02  6.02e-02  5.37e-02  2.55e-01  1.67e-01  2.68e-01   ph/cm2/s
 
Fluence        CPL   5.16e-09  1.65e-08  3.43e-08  6.62e-08  8.25e-08  1.22e-07   erg/cm2
      90%_error_low -1.54e-09 -2.52e-09 -5.01e-09 -3.86e-08 -1.24e-08 -3.99e-08   erg/cm2
      90%_error_hi   1.61e-09  2.61e-09  5.17e-09  1.16e-07  1.23e-08  1.14e-07   erg/cm2
Peak flux      CPL   2.02e-01  3.32e-01  3.57e-01  3.95e-01  1.07e+00  1.29e+00   ph/cm2/s
      90%_error_low -7.90e-02 -6.73e-02 -6.52e-02 -2.40e-01 -1.70e-01 -3.02e-01   ph/cm2/s
      90%_error_hi   8.55e-02  6.97e-02  6.75e-02  3.40e-01  1.70e-01  3.98e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   47.6861   -52.3204   0.0128     8.2862  -161.7669         0.1336411     15.079 TRIG_00965784                 
 
Foreground time interval of the image:
 -0.020   0.248 (delta_t =   0.268 [sec])
Background time interval of the image:
-239.208  -0.020 (delta_t = 239.188 [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   -0.020 sec. to    0.248 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -0.946035     ( -0.19115   0.197445 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.946035     ( -0.197445   0.19115 )
Norm@50keV  : 2.91470E-02    ( -0.00346212   0.00345246 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 0.268 sec: 3.34828 ( -0.39911  0.39943 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.61518e-08 ( -1.12979e-08  1.13886e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.020 sec. to    0.248 sec.
 XSPEC: quit
 
 
Photon index: -0.224508     ( -0.771106   0.937576 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.224508     ( -0.937576   0.771106 )
Epeak [keV] : 133.387      ( -47.9833 -133.387 )
Norm@50keV  : 6.41580E-02    ( -0.0357953   0.105944 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 0.268 sec: 3.28201 ( -0.40748  0.40679 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.24773e-08 ( -1.23697e-08  1.22609e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.384 sec. to    0.616 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -0.922412     ( -0.25026   0.26577 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.922412     ( -0.26577   0.25026 )
Norm@50keV  : 9.48453E-03    ( -0.00144582   0.00143654 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 1.08893 ( -0.166205  0.16664 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.05541e-07 ( -1.70763e-08  1.72227e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.384 sec. to    0.616 sec.
 XSPEC: quit
 
 
Photon index: -0.439555     ( -0.607171   1.18905 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.439555     ( -1.18905   0.607171 )
Epeak [keV] : 178.222      ( -178.243 -178.243 )
Norm@50keV  : 1.59293E-02    ( -0.00761093   0.0371696 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 1.07176 ( -0.170276  0.17023 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02457e-07 ( -1.87137e-08  1.83828e-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 = -1.383262840656953E-01, IMY = 4.556802781086370E-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:
-239.208000 -0.020000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
295.0602 -80.0744    3.3  46.1  139.0   4.0295   3.4 ------	UNKNOWN                       
117.0766 -31.9225    3.1  45.1   36.0   2.6362   3.7 ------	UNKNOWN                       
  6.9866 -33.3789    2.9  42.2 -139.7   2.2092   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-0.020000 0.248000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
332.8960 -53.0800    2.3  50.9  178.4   0.1347   5.1 ------	UNKNOWN                       
 47.6862 -52.3204    0.8   8.3 -161.8   0.1337  15.1 ------	UNKNOWN                       
 11.0660 -55.6173    2.1  29.6 -172.0   0.0529   5.4 ------	UNKNOWN                       
 24.1679 -53.9784    2.2  22.4 -166.0   0.0477   5.2 ------	UNKNOWN                       
 62.1739 -39.3800    2.3  10.9  -45.5   0.0458   5.2 ------	UNKNOWN                       
 76.1963 -10.4310    1.9  41.9  -28.8   0.0897   6.1 ------	UNKNOWN                       
 18.2035 -33.3370    2.9  35.2 -129.9   0.0609   4.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
37.292590 962.836400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
113.7731 -38.0331    3.6  46.9   40.3   8.6201   3.2 ------	UNKNOWN                       
 92.0787 -43.4238    3.2  30.5   31.6   4.0543   3.6 ------	UNKNOWN                       
 92.5652 -10.4442    3.5  55.3   -1.9   8.3955   3.3 ------	UNKNOWN                       
 64.1611 -30.2821    3.7  25.1  -24.3   3.0185   3.1 ------	UNKNOWN                       
359.0890 -21.8305    2.7  48.0 -129.1  15.8239   4.3 ------	UNKNOWN