GRB180620A: 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 v2.46
    Process Start Time: Fri Jul  6 12:06:46 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger843122
======================================================================

  Trigger: 00843122      Segment: 000

  BAT Trigger Time: 551176519.168   [s; MET]
      Trigger Stop: 551176520.192   [s; MET]
               UTC: 2018-06-20T08:34:58.033100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 279.883065240736   Dec: 23.2653066773561  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.35
     Image Trigger?:     NO
     Rate S/N Ratio:     15.2970585407784  [ if not an image trigger ]
     Image S/N Ratio:    9.35

  Analysis Position:   [ source = BAT ]
    RA: 279.883065240736   Dec: 23.2653066773561  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 279.889709871124   Dec: 23.2386801527283  [deg; J2000]  
        { 18h 39m 33.5s , +23d 14' 19.2" }
         +/- 0.792411373426347 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.236456845019898 [arcmin] (formal 1-sigma fit error)
    SNR: 42.410610327573
 
  Angular difference between the analysis and refined position is 1.639046 arcmin
 
  Partial Coding Fraction: 0.4375    [ including projection effects ]

  Duration
     T90: 22.9479999542236 +/- 4.98764283866462
        Measured from: -0.615999937057495
                   to: 22.3320000171661     [s; relative to TRIGTIME]
     T50: 7.2039999961853 +/- 0.237587854202095
        Measured from: 5.24800002574921
                   to: 12.4520000219345     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.46800005435944     
                   to: 5.46800005435944     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.92400002479553     
                   to: 37.7879999876022     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.837186   3.638062   2.350454   0.644124
           0.067707   0.072046   0.063744   0.053994 [error]
 Peak      0.245749   0.345944   0.251997   0.077537
           0.013635   0.015255   0.013626   0.009781 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   44.712   -6.924   37.788
T90    22.948   -0.616   22.332
T50     7.204    5.248   12.452
Peak    1.000    4.468    5.468
 
 
====== 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      -1.727    -0.053      0.052       -           -               -         1.39e-02     -3.80e-04          3.80e-04      73.530   57
CPL     -1.539    -0.202      0.213      126.544     -41.303      -126.544      1.72e-02     -3.32e-03          4.44e-03      71.020   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      -1.555     -0.092     0.091       -           -               -         6.09e-02     -3.18e-03          3.16e-03      69.380   57
CPL     -1.467     -0.171     0.334      311.824    -311.824      -311.824      6.74e-02     -9.31e-03          3.00e-02      69.150   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   9.84e-07  1.57e-06  1.90e-06  4.50e-06  5.75e-06  8.96e-06   erg/cm2
      90%_error_low -5.03e-08 -4.65e-08 -6.85e-08 -3.54e-07 -1.62e-07 -3.97e-07   erg/cm2
      90%_error_hi   5.13e-08  4.63e-08  6.83e-08  3.74e-07  1.62e-07  4.12e-07   erg/cm2
Peak flux       PL   2.64e+00  2.58e+00  1.75e+00  1.87e+00  7.73e+00  8.85e+00   ph/cm2/s
      90%_error_low -2.38e-01 -1.42e-01 -1.15e-01 -2.44e-01 -4.07e-01 -4.50e-01   ph/cm2/s
      90%_error_hi   2.45e-01  1.42e-01  1.14e-01  2.65e-01  4.08e-01  4.51e-01   ph/cm2/s
 
Fluence        CPL   9.45e-07  1.59e-06  1.92e-06  3.43e-06  5.66e-06  7.89e-06   erg/cm2
      90%_error_low -6.41e-08 -5.13e-08 -7.25e-08 -8.38e-07 -1.88e-07 -8.61e-07   erg/cm2
      90%_error_hi   6.53e-08  5.17e-08  7.31e-08  1.10e-06  1.87e-07  1.12e-06   erg/cm2
Peak flux      CPL   2.60e+00  2.60e+00  1.77e+00  1.69e+00  7.69e+00  8.65e+00   ph/cm2/s
      90%_error_low -2.85e-01 -7.94e-02 -1.19e-01 -5.25e-01 -4.24e-01 -7.02e-01   ph/cm2/s
      90%_error_hi   2.17e-01  1.59e-01  1.27e-01  3.31e-01  4.24e-01  6.09e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  279.8897    23.2387   0.0045    31.2930    49.2264         9.8681757     42.411 TRIG_00843122                 
 
Foreground time interval of the image:
 -6.924  37.788 (delta_t =  44.712 [sec])
Background time interval of the image:
-41.267  -6.924 (delta_t =  34.343 [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   -6.924 sec. to   37.788 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72735     ( -0.0525757   0.0523692 )
Norm@50keV  : 1.39187E-02    ( -0.00038009   0.000379696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.53 using 59 PHA bins.
# Reduced chi-squared =          1.290 for     57 degrees of freedom 
# Null hypothesis probability =   6.934043e-02
 
Photon flux (15-150 keV)    in 44.71 sec: 1.86666 ( -0.05596  0.05617 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.75114e-06 ( -1.61872e-07  1.62228e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -6.924 sec. to   37.788 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53885     ( -0.202384   0.212923 )
Epeak [keV] : 126.544      ( -41.3033 -126.544 )
Norm@50keV  : 1.71515E-02    ( -0.0033232   0.00444071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.02 using 59 PHA bins.
# Reduced chi-squared =          1.268 for     56 degrees of freedom 
# Null hypothesis probability =   8.514790e-02
 
Photon flux (15-150 keV)    in 44.71 sec: 1.83846 ( -0.06301  0.06329 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.66243e-06 ( -1.8793e-07  1.87148e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    4.468 sec. to    5.468 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.55507     ( -0.0919415   0.0912262 )
Norm@50keV  : 6.09414E-02    ( -0.00317631   0.00316174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.38 using 59 PHA bins.
# Reduced chi-squared =          1.217 for     57 degrees of freedom 
# Null hypothesis probability =   1.258574e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.72642 ( -0.40683  0.4077 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.73377e-07 ( -3.21867e-08  3.23264e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.468 sec. to    5.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.46674     ( -0.170602   0.33411 )
Epeak [keV] : 311.824      ( -311.824 -311.824 )
Norm@50keV  : 6.73790E-02    ( -0.00930941   0.0300083 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.15 using 59 PHA bins.
# Reduced chi-squared =          1.235 for     56 degrees of freedom 
# Null hypothesis probability =   1.114549e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.69197 ( -0.42397  0.42433 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.70033e-07 ( -3.44584e-08  3.38461e-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 = 3.969636863810926E-01, IMY = -4.603158957568526E-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:
-41.267400 -6.924000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2615  35.4197    4.2  11.8   99.9  -0.1868  -2.8   10.7	Her X-1                       
288.7651  11.0562    9.0  46.1   48.3   0.3819   1.3    6.9	GRS 1915+105                  
299.5425  35.2429    6.8  35.2   11.3   0.1503   1.7    3.4	Cyg X-1                       
308.0689  40.9620    4.7  38.0   -2.7   0.2316   2.4    2.0	Cyg X-3                       
326.2152  38.3768    2.6  51.3   -9.9   0.6432   4.4    3.9	Cyg X-2                       
276.8615  18.7872    2.2  33.7   58.0   0.6277   5.3 ------	UNKNOWN                       
218.3557  24.4401    2.5  36.7  162.5   0.4737   4.6 ------	UNKNOWN                       
234.8760  44.2814    2.6  14.1 -176.8   0.2773   4.4 ------	UNKNOWN                       
329.9458  47.7405    2.3  48.7  -22.1   0.6555   5.0 ------	UNKNOWN                       
337.8955  37.2996    2.1  59.4  -15.5   2.2743   5.5 ------	UNKNOWN                       

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

Time interval of the image:
-6.924000 37.788000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2905  35.2609    5.2  12.0   99.8   0.2840   2.2    9.5	Her X-1                       
288.8375  10.8141    4.4  46.4   48.4   1.8040   2.6    8.2	GRS 1915+105                  
299.6966  35.1881   14.1  35.3   11.2   0.1514   0.8    5.3	Cyg X-1                       
308.1527  41.0130    8.6  38.1   -2.8  -0.2586  -1.3    4.1	Cyg X-3                       
326.1837  38.4076    5.1  51.3   -9.9  -0.6973  -2.3    5.2	Cyg X-2                       
279.8897  23.2387    0.3  31.3   49.2   9.8679  42.4 ------	UNKNOWN                       
173.1770  55.6115    2.5  48.6 -130.3   2.6227   4.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
250.732600 962.849500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2801  35.4269   11.1  25.3 -159.0  -0.6541  -1.0   10.1	Her X-1                       
268.3777  -1.4405   43.1  27.2  102.5   0.2443   0.3    0.9	SW J1753.5-0127               
273.8697 -14.0758    5.6  37.8   86.1   4.0280   2.1    8.3	GX 17+2                       
288.7874  10.9277    1.0  15.0   40.6   6.7600  11.8    1.2	GRS 1915+105                  
299.5682  35.1795    1.5  20.8  -52.7   4.9468   7.5    1.7	Cyg X-1                       
308.0835  40.9665    2.2  29.5  -57.0   4.7389   5.2    1.5	Cyg X-3                       
326.0490  38.4188   14.9  41.9  -45.7  -0.9646  -0.8    8.2	Cyg X-2                       
303.5544 -15.9586    2.6  45.6   43.9   8.8577   4.5 ------	UNKNOWN                       
275.0925   7.1749    0.2  16.8   93.3  30.1602  48.7 ------	UNKNOWN                       
219.2680  18.2631    3.6  56.5  173.7  10.7371   3.2 ------	UNKNOWN                       
288.6588  12.5322    2.6  13.6   37.3   2.4309   4.5 ------	UNKNOWN                       
326.7207  16.9660    2.6  44.2  -14.2   4.0432   4.4 ------	UNKNOWN                       
333.9737  13.3059    4.0  52.0  -12.4   4.2459   2.9 ------	UNKNOWN