GRB180614A: 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 12:14:06 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger841548
======================================================================

  Trigger: 00841548      Segment: 000

  BAT Trigger Time: 550696594.752   [s; MET]
      Trigger Stop: 550696595.776   [s; MET]
               UTC: 2018-06-14T19:16:13.646380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 3.15726986515184   Dec: 46.9428648506083  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.68
     Image Trigger?:     NO
     Rate S/N Ratio:     11.7898261225516  [ if not an image trigger ]
     Image S/N Ratio:    6.68

  Analysis Position:   [ source = BAT ]
    RA: 3.15726986515184   Dec: 46.9428648506083  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 3.07393951220496   Dec: 46.9675282230226  [deg; J2000]  
        { 00h 12m 17.7s , +46d 58' 03.1" }
         +/- 1.84131278993619 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.703858984219927 [arcmin] (formal 1-sigma fit error)
    SNR: 12.7164154727742
 
  Angular difference between the analysis and refined position is 3.719748 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 7.0919998884201 +/- 0.941148188501542
        Measured from: -3.9559999704361
                   to: 3.13599991798401     [s; relative to TRIGTIME]
     T50: 3.567999958992 +/- 1.06300895367581
        Measured from: -1.87999999523163
                   to: 1.68799996376038     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.56400001049042     
                   to: 2.56400001049042     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.34799993038177     
                   to: 3.45200002193451     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.123056   0.117222   0.089059   0.036483
           0.015168   0.015447   0.013472   0.011281 [error]
 Peak      0.021967   0.028241   0.033065   0.005182
           0.005514   0.005688   0.005156   0.004073 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    7.800   -4.348    3.452
T90     7.092   -3.956    3.136
T50     3.568   -1.880    1.688
Peak    1.000    1.564    2.564
 
 
====== 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      -1.534    -0.258      0.251       -           -               -         2.86e-03     -3.91e-04          3.83e-04      66.220   57
CPL     -1.550    -0.242      0.270     9999.360    -9999.360      -9999.360      2.86e-03        N/A               N/A         66.250   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      -1.250     -0.311     0.314       -           -               -         5.68e-03     -1.06e-03          1.06e-03      57.820   57
CPL      0.169     -1.505     2.546       80.824     -22.514       -80.824      2.68e-02     -2.68e-02          3.12e-01      55.360   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   2.94e-08  5.29e-08  7.31e-08  2.10e-07  2.10e-07  3.65e-07   erg/cm2
      90%_error_low -6.49e-09 -7.00e-09 -1.38e-08 -7.54e-08 -3.17e-08 -8.76e-08   erg/cm2
      90%_error_hi   6.86e-09  6.92e-09  1.36e-08  1.00e-07  3.23e-08  1.08e-07   erg/cm2
Peak flux       PL   1.84e-01  2.15e-01  1.81e-01  2.57e-01  6.72e-01  8.37e-01   ph/cm2/s
      90%_error_low -5.85e-02 -4.55e-02 -4.01e-02 -1.00e-01 -1.27e-01 -1.63e-01   ph/cm2/s
      90%_error_hi   6.47e-02  4.47e-02  3.95e-02  1.34e-01  1.28e-01  1.68e-01   ph/cm2/s
 
Fluence        CPL   2.68e-08  3.77e-08  4.11e-08  1.03e-07  1.33e-07  2.09e-07   erg/cm2
      90%_error_low -8.08e-09 -1.10e-08 -9.70e-09 -2.91e-08 -3.41e-08 -6.09e-08   erg/cm2
      90%_error_hi   7.55e-09  9.08e-09  7.28e-09  2.41e-08  2.55e-08  5.49e-08   erg/cm2
Peak flux      CPL   1.34e-01  2.36e-01  2.03e-01  8.05e-02  6.32e-01  6.54e-01   ph/cm2/s
      90%_error_low -1.34e-01 -5.42e-02 -4.90e-02 -8.05e-02 -1.40e-01 -1.58e-01   ph/cm2/s
      90%_error_hi   8.37e-02  5.60e-02  5.20e-02  1.03e-01  1.37e-01  2.35e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    3.0739    46.9675   0.0151    15.8711   -26.8581         0.3952333     12.716 TRIG_00841548                 
 
Foreground time interval of the image:
 -4.348   3.452 (delta_t =   7.800 [sec])
Background time interval of the image:
-239.752  -4.348 (delta_t = 235.404 [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   -4.348 sec. to    3.452 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53439     ( -0.257847   0.251142 )
Norm@50keV  : 2.85858E-03    ( -0.000390893   0.000382703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.22 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     57 degrees of freedom 
# Null hypothesis probability =   1.886337e-01
 
Photon flux (15-150 keV)    in 7.8 sec: 0.360276 ( -0.046343  0.046437 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.10409e-07 ( -3.17459e-08  3.22659e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -4.348 sec. to    3.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53285     ( -0.24333   0.269194 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 2.86601E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.24 using 59 PHA bins.
# Reduced chi-squared =          1.183 for     56 degrees of freedom 
# Null hypothesis probability =   1.644692e-01
 
Photon flux (15-150 keV)    in 7.8 sec: 0.361555 ( -0.049459  0.046637 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32811e-07 ( -3.41324e-08  2.5479e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.564 sec. to    2.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25014     ( -0.311075   0.313918 )
Norm@50keV  : 5.68434E-03    ( -0.00106212   0.0010611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.82 using 59 PHA bins.
# Reduced chi-squared =          1.014 for     57 degrees of freedom 
# Null hypothesis probability =   4.447883e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.672326 ( -0.127363  0.127696 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.68932e-08 ( -1.17752e-08  1.19609e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.564 sec. to    2.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.168862     ( -1.50503   2.5461 )
Epeak [keV] : 80.8241      ( -22.5083 -80.8179 )
Norm@50keV  : 2.68204E-02    ( -0.0268312   0.312478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.36 using 59 PHA bins.
# Reduced chi-squared =         0.9886 for     56 degrees of freedom 
# Null hypothesis probability =   4.990201e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.631847 ( -0.140473  0.136763 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.20355e-08 ( -1.25616e-08  1.31784e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 7.092 sec.
Hardness ratio (energy fluence ratio) = 1.38092457908

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

S(15-50 keV)  = 8.231296e-08
S(50-150 keV) = 1.2809695e-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 = 2.536422733363475E-01, IMY = 1.284466905365120E-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:
-239.752000 -4.348000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5206  35.3367    7.1  37.9   94.9   1.1433   1.6    8.8	Cyg X-1                       
308.0206  40.9940    5.0  29.3   91.8   0.7741   2.3    4.8	Cyg X-3                       
326.2526  38.3663    2.6  23.9   62.0   1.0704   4.4    4.7	Cyg X-2                       
185.6656  76.0419    2.3  44.5 -164.3   1.8136   4.9 ------	UNKNOWN                       

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

Time interval of the image:
-4.348000 3.452000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6009  35.0165   11.3  38.1   94.5   0.1150   1.0   11.1	Cyg X-1                       
308.1752  40.8031    3.0  29.4   91.3   0.1933   3.8    9.4	Cyg X-3                       
325.9506  38.3008   10.4  24.0   62.4   0.0446   1.1   10.5	Cyg X-2                       
  3.0740  46.9676    0.9  15.9  -26.9   0.3952  12.7 ------	UNKNOWN                       
125.5142  66.1142    2.2  51.6 -138.1   0.8537   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
49.548580 962.368000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0940  40.9075    3.8  39.3  111.7   5.7808   3.0    2.8	Cyg X-3                       
326.2495  38.2026    4.8  28.2   95.3   2.2943   2.4    8.0	Cyg X-2                       
271.3508  60.2416    2.9  51.4  150.4  12.6611   4.0 ------	UNKNOWN                       
  6.7794  13.6163    2.2  33.5    3.4   3.8494   5.3 ------	UNKNOWN