GRB200522A: 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 Jun 29 14:57:17 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger973628
======================================================================

  Trigger: 00973628      Segment: 000

  BAT Trigger Time: 611840519.104   [s; MET]
      Trigger Stop: 611840519.232   [s; MET]
               UTC: 2020-05-22T11:41:34.120260    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 5.6665227392278   Dec: -0.281632466181719  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.79
     Image Trigger?:     NO
     Rate S/N Ratio:     30.6267856622271  [ if not an image trigger ]
     Image S/N Ratio:    9.79

  Analysis Position:   [ source = BAT ]
    RA: 5.6665227392278   Dec: -0.281632466181719  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 5.66782439003557   Dec: -0.263856485130308  [deg; J2000]  
        { 00h 22m 40.3s , -00d 15' 49.9" }
         +/- 1.59272349933067 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.642255218385053 [arcmin] (formal 1-sigma fit error)
    SNR: 15.6439492161112
 
  Angular difference between the analysis and refined position is 1.069414 arcmin
 
  Partial Coding Fraction: 0.8671875    [ including projection effects ]

  Duration
     T90: 0.615999937057495 +/- 0.0785875019843526
        Measured from: -0.00399994850158691
                   to: 0.611999988555908     [s; relative to TRIGTIME]
     T50: 0.375999927520752 +/- 0.0519999724168052
        Measured from: 0.0520000457763672
                   to: 0.427999973297119     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.169999957084656     
                   to: 0.830000042915344     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0159999132156372     
                   to: 0.672000050544739     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.045601   0.069664   0.051853   0.016226
           0.005911   0.006551   0.005889   0.004600 [error]
 Peak      0.046536   0.072450   0.053824   0.019442
           0.006831   0.007474   0.006629   0.005261 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.688   -0.016    0.672
T90     0.616   -0.004    0.612
T50     0.376    0.052    0.428
Peak    1.000   -0.170    0.830
 
 
====== 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      -1.452    -0.171      0.169       -           -               -         1.68e-02     -1.83e-03          1.82e-03      38.930   57
CPL     -0.535    -0.695      0.830       77.764     -18.375        86.738      5.04e-02     -2.80e-02          8.34e-02      33.590   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      -1.412     -0.184     0.183       -           -               -         1.22e-02     -1.42e-03          1.42e-03      47.540   57
CPL     -0.602     -0.742     0.856       84.088     -23.177       204.322      3.22e-02     -1.82e-02          5.63e-02      43.650   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   1.41e-08  2.67e-08  3.91e-08  1.22e-07  1.11e-07  2.02e-07   erg/cm2
      90%_error_low -2.32e-09 -2.90e-09 -5.42e-09 -3.15e-08 -1.33e-08 -3.69e-08   erg/cm2
      90%_error_hi   2.40e-09  2.89e-09  5.40e-09  3.79e-08  1.34e-08  4.20e-08   erg/cm2
Peak flux       PL   4.62e-01  4.89e-01  3.68e-01  4.48e-01  1.49e+00  1.77e+00   ph/cm2/s
      90%_error_low -8.48e-02 -5.95e-02 -5.23e-02 -1.15e-01 -1.71e-01 -2.08e-01   ph/cm2/s
      90%_error_hi   8.87e-02  5.91e-02  5.19e-02  1.36e-01  1.72e-01  2.10e-01   ph/cm2/s
 
Fluence        CPL   1.24e-08  2.98e-08  4.11e-08  3.67e-08  1.04e-07  1.20e-07   erg/cm2
      90%_error_low -2.68e-09 -3.73e-09 -6.22e-09 -2.08e-08 -1.42e-08 -2.50e-08   erg/cm2
      90%_error_hi   2.74e-09  3.89e-09  6.26e-09  5.08e-08  1.44e-08  5.07e-08   erg/cm2
Peak flux      CPL   4.08e-01  5.35e-01  3.91e-01  1.90e-01  1.46e+00  1.52e+00   ph/cm2/s
      90%_error_low -9.69e-02 -7.30e-02 -5.98e-02 -1.03e-01 -1.74e-01 -2.05e-01   ph/cm2/s
      90%_error_hi   1.00e-01  7.62e-02  6.09e-02  2.14e-01  1.74e-01  2.50e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    5.6678    -0.2639   0.0123    24.8303   170.5365         0.1881012     15.644 TRIG_00973628                 
 
Foreground time interval of the image:
 -0.016   0.672 (delta_t =   0.688 [sec])
Background time interval of the image:
-239.104  -0.016 (delta_t = 239.088 [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   -0.016 sec. to    0.672 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -1.45184     ( -0.171227   0.168983 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45184     ( -0.168983   0.171227 )
Norm@50keV  : 1.68135E-02    ( -0.00183456   0.00182433 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 0.688 sec: 2.07303 ( -0.2197  0.21981 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10672e-07 ( -1.32635e-08  1.34009e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.016 sec. to    0.672 sec.
 XSPEC: quit
 
 
Photon index: -0.534902     ( -0.694607   0.829632 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.534902     ( -0.829632   0.694607 )
Epeak [keV] : 77.7636      ( -18.3751 86.7387 )
Norm@50keV  : 5.04322E-02    ( -0.028031   0.0833924 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 0.688 sec: 2.01902 ( -0.22365  0.22368 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03896e-07 ( -1.42005e-08  1.44054e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.170 sec. to    0.830 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -1.41246     ( -0.183848   0.182888 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.41246     ( -0.182888   0.183848 )
Norm@50keV  : 1.21961E-02    ( -0.00142297   0.00141713 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 1.48954 ( -0.1715  0.17164 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.17566e-07 ( -1.50811e-08  1.52315e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.170 sec. to    0.830 sec.
 XSPEC: quit
 
 
Photon index: -0.602359     ( -0.742177   0.855772 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.602359     ( -0.855772   0.742177 )
Epeak [keV] : 84.0885      ( -23.1773 204.322 )
Norm@50keV  : 3.22326E-02    ( -0.0181839   0.0563063 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 1.45644 ( -0.17401  0.17413 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10958e-07 ( -1.62929e-08  1.64216e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.6159999 sec.
Hardness ratio (energy fluence ratio) = 1.46227793848

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

S(15-50 keV)  = 4.083833e-08
S(50-150 keV) = 6.983504e-08

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 = -4.564087144354455E-01, IMY = -7.607749107181289E-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:
-239.104000 -0.016000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 76.7383 -50.4005    2.8  54.0    8.1   3.1733   4.1 ------	UNKNOWN                       
 19.4080  36.8170    4.0  52.2 -140.7   3.3170   2.9 ------	UNKNOWN                       
 26.8063  34.0545    3.1  49.1 -133.1   4.0978   3.7 ------	UNKNOWN                       

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

Time interval of the image:
-0.016000 0.672000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  5.6678  -0.2638    0.7  24.8  170.5   0.1881  15.6  340.4	UNKNOWN                       
  1.1358  32.6606    2.2  53.2 -160.2   0.1835   5.2 ------	UNKNOWN                       
 81.0879 -22.1319    2.1  52.6  -27.6   0.1803   5.5 ------	UNKNOWN                       
 50.8027   8.8444    2.0  34.4  -86.6   0.1271   5.7 ------	UNKNOWN                       
 49.1078  18.8011    2.4  40.9  -99.3   0.2245   4.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
67.196590 648.796630
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1844  38.3653   66.4  53.0  166.5  -0.3494  -0.2    2.7	Cyg X-2                       
339.6336 -29.7038    3.0  38.5   63.0   4.7819   3.8 ------	UNKNOWN                       
351.4667 -32.1571    4.1  34.6   46.7   2.2911   2.8 ------	UNKNOWN                       
332.3911  45.2501    2.2  54.2  176.7  11.0852   5.3 ------	UNKNOWN                       
  4.0307  -3.6480    2.5   3.7   51.2   2.0404   4.7  326.1	UNKNOWN                       
347.3648  30.4812    2.7  35.4  177.3   2.7433   4.3 ------	UNKNOWN