GRB190611A: 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: Mon Jul 15 18:48:48 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger907950
======================================================================

  Trigger: 00907950      Segment: 000

  BAT Trigger Time: 581968165.056   [s; MET]
      Trigger Stop: 581968168.128   [s; MET]
               UTC: 2019-06-11T17:49:01.998020    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 324.769471588208   Dec: -56.0820139162483  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.07
     Image Trigger?:     NO
     Rate S/N Ratio:     9.8488578017961  [ if not an image trigger ]
     Image S/N Ratio:    8.07

  Analysis Position:   [ source = BAT ]
    RA: 324.769471588208   Dec: -56.0820139162483  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 324.688802979586   Dec: -56.070159736166  [deg; J2000]  
        { 21h 38m 45.3s , -56d 04' 12.6" }
         +/- 3.00757869958733 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.53750048339943 [arcmin] (formal 1-sigma fit error)
    SNR: 6.30886503354018
 
  Angular difference between the analysis and refined position is 2.793297 arcmin
 
  Partial Coding Fraction: 0.640625    [ including projection effects ]

  Duration
     T90: 41.7599999904633 +/- 30.6217243001004
        Measured from: -0.0199999809265137
                   to: 41.7400000095367     [s; relative to TRIGTIME]
     T50: 8.92799985408783 +/- 47.7482401059384
        Measured from: 1.76400005817413
                   to: 10.691999912262     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.544000029563904     
                   to: 1.5440000295639     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.871999979019165     
                   to: 63.8240000009537     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.203410   0.322570   0.193843   0.078709
           0.078270   0.080610   0.071547   0.064207 [error]
 Peak      0.007294   0.050246   0.042282   0.002825
           0.010225   0.011765   0.009968   0.008679 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   64.696   -0.872   63.824
T90    41.760   -0.020   41.740
T50     8.928    1.764   10.692
Peak    1.000    0.544    1.544
 
 
====== 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      -1.873    -0.584      0.496       -           -               -         7.69e-04     -2.75e-04          2.58e-04      55.400   57
CPL     -0.587    -1.584      4.145       49.568     -37.802       -49.568      3.86e-03     -3.86e-03          6.13e-01      54.710   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      -1.224     -0.432     0.450       -           -               -         7.75e-03     -2.15e-03          2.15e-03      44.240   57
CPL      1.420     -2.549     5.415       70.633     -17.950       297.580      1.25e-01     -1.25e-01          2.72e+01      41.120   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   9.03e-08  1.32e-07  1.44e-07  2.95e-07  4.57e-07  6.62e-07   erg/cm2
      90%_error_low -3.49e-08 -3.75e-08 -6.61e-08 -2.01e-07 -1.53e-07 -2.90e-07   erg/cm2
      90%_error_hi   3.77e-08  3.74e-08  6.82e-08  3.65e-07  1.61e-07  4.17e-07   erg/cm2
Peak flux       PL   2.45e-01  2.91e-01  2.49e-01  3.62e-01  9.13e-01  1.15e+00   ph/cm2/s
      90%_error_low -1.13e-01 -9.59e-02 -7.57e-02 -1.80e-01 -2.63e-01 -3.21e-01   ph/cm2/s
      90%_error_hi   1.34e-01  9.40e-02  7.45e-02  2.58e-01  2.66e-01  3.26e-01   ph/cm2/s
 
Fluence        CPL   7.71e-08  1.52e-07  1.46e-07  6.05e-08  4.19e-07  4.36e-07   erg/cm2
      90%_error_low -4.64e-08 -9.17e-08 -7.75e-08    N/A    -1.45e-07 -1.61e-07   erg/cm2
      90%_error_hi   4.51e-08  5.70e-08  7.81e-08    N/A     1.77e-07  3.48e-07   erg/cm2
Peak flux      CPL   1.27e-01  3.30e-01  3.12e-01  7.14e-02  8.31e-01  8.41e-01   ph/cm2/s
      90%_error_low -1.27e-01 -1.29e-01 -1.00e-01 -7.14e-02 -2.73e-01 -2.83e-01   ph/cm2/s
      90%_error_hi   1.68e-01  1.28e-01  1.05e-01  2.73e-01  2.81e-01  3.43e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  324.6888   -56.0702   0.0304    35.4454    -7.0721         0.7821096      6.309 TRIG_00907950                 
 
Foreground time interval of the image:
 -0.872  40.045 (delta_t =  40.917 [sec])
Background time interval of the image:
-239.056  -0.872 (delta_t = 238.184 [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   -0.872 sec. to   63.824 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87327     ( -0.584151   0.495597 )
Norm@50keV  : 7.68817E-04    ( -0.000274939   0.000257652 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.40 using 59 PHA bins.
# Reduced chi-squared =         0.9719 for     57 degrees of freedom 
# Null hypothesis probability =   5.353562e-01
 
Photon flux (15-150 keV)    in 64.7 sec: 0.109109 ( -0.0308414  0.030854 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.57366e-07 ( -1.53169e-07  1.60543e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.872 sec. to   63.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.58656     ( -1.58605   4.14344 )
Epeak [keV] : 49.5680      ( -37.8006 -49.5665 )
Norm@50keV  : 3.86045E-03    ( -0.00387288   0.612918 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.71 using 59 PHA bins.
# Reduced chi-squared =         0.9770 for     56 degrees of freedom 
# Null hypothesis probability =   5.236345e-01
 
Photon flux (15-150 keV)    in 64.7 sec: 0.104241 ( -0.0327738  0.032476 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.19405e-07 ( -1.44702e-07  1.76578e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.544 sec. to    1.544 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22447     ( -0.431616   0.449846 )
Norm@50keV  : 7.74887E-03    ( -0.0021515   0.00214798 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.24 using 59 PHA bins.
# Reduced chi-squared =         0.7761 for     57 degrees of freedom 
# Null hypothesis probability =   8.915640e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.912858 ( -0.263025  0.265572 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.8089e-08 ( -2.26418e-08  2.28619e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.544 sec. to    1.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.41966     ( -2.55719   5.4061 )
Epeak [keV] : 70.6333      ( -17.8704 297.659 )
Norm@50keV  : 0.125015    ( -0.126706   27.2133 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.12 using 59 PHA bins.
# Reduced chi-squared =         0.7342 for     56 degrees of freedom 
# Null hypothesis probability =   9.319207e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.830506 ( -0.273417  0.281344 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.98538e-08 ( -2.33381e-08  2.49291e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 41.76 sec.
Hardness ratio (energy fluence ratio) = 1.09184282398

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

S(15-50 keV)  = 2.2249253e-07
S(50-150 keV) = 2.3487081e-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 = 7.064402086766872E-01, IMY = 8.764267341448809E-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:
-239.056000 -0.872000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
274.1749 -13.9451    4.6  39.5   96.0   6.3203   2.5   11.3	GX 17+2                       
275.9560 -30.2911    4.7  36.1   69.7  -2.9441  -2.5    4.8	H1820-303                     
285.0567 -24.8992   47.6  27.8   79.0  -0.2009  -0.2    1.7	HT1900.1-2455                 
288.8468  11.0568   21.3  41.4  141.2   0.8434   0.5    7.3	GRS 1915+105                  
290.2486  17.9434    3.0  46.2  148.6   7.3127   3.8 ------	UNKNOWN                       
279.6052 -49.6956    2.9  39.8   38.1   4.1530   4.1 ------	UNKNOWN                       
296.1110  -9.8975    2.3  21.5  121.4   3.4027   5.0 ------	UNKNOWN                       
307.9853 -48.8663    3.0  28.1   12.1   2.3200   3.8 ------	UNKNOWN                       
311.1403 -29.2659    2.5   8.7   25.5   2.4468   4.7 ------	UNKNOWN                       
312.7392   6.9135    3.3  28.4  177.3   2.0292   3.5 ------	UNKNOWN                       

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

Time interval of the image:
-0.872000 40.044600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
274.0543 -14.0645    4.2  39.6   95.8   1.3045   2.8    3.3	GX 17+2                       
276.0108 -30.2608    4.0  36.1   69.7   0.8279   2.8    7.8	H1820-303                     
284.9260 -24.8094    7.6  27.9   79.2   0.2677   1.5    9.0	HT1900.1-2455                 
288.6814  11.0478    4.9  41.5  141.0   0.6934   2.4    9.2	GRS 1915+105                  
324.6894 -56.0702    1.8  35.4   -7.1   0.7829   6.3 ------	UNKNOWN                       
345.1665  25.7304    2.1  55.4 -144.5   2.7481   5.5 ------	UNKNOWN                       
357.2568 -12.6217    2.1  41.2  -93.0   2.0359   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
97.444600 914.744590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.8836 -44.5592    3.9  38.6   74.4  13.1401   3.0    8.9	4U 1735-44                    
252.3099 -50.4553    2.2  41.7   59.1  30.7811   5.2 ------	UNKNOWN                       
282.7501 -43.9867    2.6  29.0   89.8  12.9608   4.4 ------	UNKNOWN                       
207.0628 -63.2662    2.2  51.3   23.8  30.6086   5.2 ------	UNKNOWN                       
302.6150 -40.1967    2.2  21.5  121.4  10.9785   5.2 ------	UNKNOWN                       
 27.3219 -56.4433    2.3  33.5  -69.5  13.9097   5.0 ------	UNKNOWN