GRB190324A: 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: Thu Apr 11 00:01:10 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger894718
======================================================================

  Trigger: 00894718      Segment: 000

  BAT Trigger Time: 575160264.256   [s; MET]
      Trigger Stop: 575160266.304   [s; MET]
               UTC: 2019-03-24T22:44:01.630420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 49.5763772428907   Dec: -47.2395129362167  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.57
     Image Trigger?:     NO
     Rate S/N Ratio:     13.1909059582729  [ if not an image trigger ]
     Image S/N Ratio:    8.57

  Analysis Position:   [ source = BAT ]
    RA: 49.5763772428907   Dec: -47.2395129362167  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 49.6036803152047   Dec: -47.2105138223664  [deg; J2000]  
        { 03h 18m 24.9s , -47d 12' 37.8" }
         +/- 0.835185904755716 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.275887513888331 [arcmin] (formal 1-sigma fit error)
    SNR: 39.3420266492248
 
  Angular difference between the analysis and refined position is 2.065218 arcmin
 
  Partial Coding Fraction: 0.5625    [ including projection effects ]

  Duration
     T90: 22.7840000391006 +/- 10.149727151475
        Measured from: 17.2719999551773
                   to: 40.055999994278     [s; relative to TRIGTIME]
     T50: 6 +/- 0.329848476648913
        Measured from: 20.9679999351501
                   to: 26.9679999351501     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 23.7400000095367     
                   to: 24.7400000095367     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.407999992370605     
                   to: 57.607999920845     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.708741   4.117331   3.191692   0.723602
           0.082710   0.090275   0.081149   0.065897 [error]
 Peak      0.340820   0.554028   0.436717   0.094187
           0.017710   0.021465   0.019528   0.012173 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   58.016   -0.408   57.608
T90    22.784   17.272   40.056
T50     6.000   20.968   26.968
Peak    1.000   23.740   24.740
 
 
====== 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      -1.474    -0.051      0.051       -           -               -         1.27e-02     -3.50e-04          3.50e-04      66.720   57
CPL     -1.198    -0.198      0.208      157.155     -44.915       235.314      1.71e-02     -3.20e-03          4.14e-03      60.960   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -1.416     -0.075     0.075       -           -               -         9.67e-02     -4.36e-03          4.36e-03      66.970   57
CPL     -0.774     -0.319     0.343      101.977     -18.819        47.865      1.97e-01     -5.72e-02          8.82e-02      54.360   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   9.21e-07  1.72e-06  2.48e-06  7.56e-06  7.04e-06  1.27e-05   erg/cm2
      90%_error_low -4.94e-08 -5.43e-08 -8.40e-08 -5.67e-07 -2.06e-07 -6.16e-07   erg/cm2
      90%_error_hi   5.04e-08  5.41e-08  8.38e-08  5.98e-07  2.06e-07  6.41e-07   erg/cm2
Peak flux       PL   3.67e+00  3.88e+00  2.91e+00  3.54e+00  1.18e+01  1.40e+01   ph/cm2/s
      90%_error_low -2.89e-01 -1.93e-01 -1.58e-01 -3.77e-01 -5.46e-01 -6.37e-01   ph/cm2/s
      90%_error_hi   2.96e-01  1.92e-01  1.57e-01  4.02e-01  5.47e-01  6.38e-01   ph/cm2/s
 
Fluence        CPL   8.64e-07  1.75e-06  2.53e-06  5.21e-06  6.91e-06  1.04e-05   erg/cm2
      90%_error_low -6.22e-08 -5.95e-08 -9.35e-08 -1.16e-06 -2.27e-07 -1.17e-06   erg/cm2
      90%_error_hi   6.33e-08  5.99e-08  9.42e-08  1.57e-06  2.26e-07  1.57e-06   erg/cm2
Peak flux      CPL   3.20e+00  4.09e+00  3.12e+00  1.94e+00  1.15e+01  1.24e+01   ph/cm2/s
      90%_error_low -3.54e-01 -2.22e-01 -1.91e-01 -4.78e-01 -5.63e-01 -7.56e-01   ph/cm2/s
      90%_error_hi   3.63e-01  2.25e-01  1.93e-01  6.51e-01  5.64e-01  8.44e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   49.6037   -47.2105   0.0049    29.2660   -64.1523        11.4082013     39.342 TRIG_00894718                 
 
Foreground time interval of the image:
 -0.408  57.608 (delta_t =  58.016 [sec])
Background time interval of the image:
-239.256  -0.408 (delta_t = 238.848 [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   -0.408 sec. to   57.608 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47418     ( -0.0510666   0.0510819 )
Norm@50keV  : 1.27357E-02    ( -0.000350052   0.000350033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.72 using 59 PHA bins.
# Reduced chi-squared =          1.170 for     57 degrees of freedom 
# Null hypothesis probability =   1.775567e-01
 
Photon flux (15-150 keV)    in 58.02 sec: 1.57917 ( -0.0473  0.04742 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.04137e-06 ( -2.05591e-07  2.05959e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.408 sec. to   57.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19791     ( -0.198358   0.207699 )
Epeak [keV] : 157.155      ( -44.9149 235.314 )
Norm@50keV  : 1.71261E-02    ( -0.00319941   0.00414159 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.96 using 59 PHA bins.
# Reduced chi-squared =          1.089 for     56 degrees of freedom 
# Null hypothesis probability =   3.021816e-01
 
Photon flux (15-150 keV)    in 58.02 sec: 1.54995 ( -0.0513  0.05143 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.91047e-06 ( -2.26914e-07  2.26233e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   23.740 sec. to   24.740 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41568     ( -0.0751724   0.0747674 )
Norm@50keV  : 9.66981E-02    ( -0.00436355   0.00436055 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.97 using 59 PHA bins.
# Reduced chi-squared =          1.175 for     57 degrees of freedom 
# Null hypothesis probability =   1.720804e-01
 
Photon flux (15-150 keV)    in 1 sec: 11.8188 ( -0.5463  0.5469 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.31537e-07 ( -4.58098e-08  4.59253e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   23.740 sec. to   24.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.773714     ( -0.318808   0.342788 )
Epeak [keV] : 101.977      ( -18.8182 47.8656 )
Norm@50keV  : 0.196552    ( -0.0571908   0.0882113 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.36 using 59 PHA bins.
# Reduced chi-squared =         0.9707 for     56 degrees of freedom 
# Null hypothesis probability =   5.371301e-01
 
Photon flux (15-150 keV)    in 1 sec: 11.5249 ( -0.5634  0.5641 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.03504e-07 ( -4.88506e-08  4.87e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 22.784 sec.
Hardness ratio (energy fluence ratio) = 1.43979304869

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

S(15-50 keV)  = 2.6402197e-06
S(50-150 keV) = 4.401142e-06

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 = 2.443212856985810E-01, IMY = 5.043304860523055E-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:
-239.256000 -0.408000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.2490 -40.5307    0.0  38.1   60.1   1.1257   0.6   12.8	Vela X-1                      
170.4444 -60.7538   16.2  32.7  111.4   0.8888   0.7    8.7	Cen X-3                       
186.6576 -62.7861    6.9  35.8  124.4   2.4494   1.7    1.0	GX 301-2                      
110.9555 -28.2649    3.3  43.8   25.1   4.1303   3.5 ------	UNKNOWN                       
129.0866 -58.1489    2.3  21.0   71.8   3.7740   5.0 ------	UNKNOWN                       
273.7794 -63.7862    2.7  46.2  178.7   6.3077   4.3 ------	UNKNOWN                       
 60.2049 -27.4902    2.5  45.3  -40.2   6.4360   4.7 ------	UNKNOWN                       

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

Time interval of the image:
-0.408000 57.608000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5998 -40.4010   11.5  38.4   60.4   0.5380   1.0    9.8	Vela X-1                      
170.3546 -60.5322   28.7  32.9  111.1  -0.1669  -0.4    5.6	Cen X-3                       
186.5726 -62.6268   20.7  35.9  124.2   0.2553   0.6    8.9	GX 301-2                      
124.5553 -32.0557    1.8  43.0   43.1   2.7478   6.6 ------	UNKNOWN                       
254.5409 -54.6841    2.6  55.0  165.7   5.5428   4.5 ------	UNKNOWN                       
 25.5169 -66.3703    2.8  22.4 -116.3   1.0079   4.1 ------	UNKNOWN                       
 49.6037 -47.2105    0.3  29.3  -64.2  11.4072  39.3 ------	UNKNOWN                       
 21.6297 -54.3339    3.5  32.4 -101.0   1.3960   3.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
681.844610 937.644600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6477 -40.6647   13.8  38.4   30.8   0.5363   0.8    8.5	Vela X-1                      
170.1183 -60.4410    0.0  15.8   75.0   0.3340   0.9   12.4	Cen X-3                       
186.5894 -62.6846    1.8  14.7  106.1   2.2232   6.6    5.5	GX 301-2                      
255.9293 -37.7429    7.2  52.8  170.5   1.9923   1.6    6.7	4U 1700-377                   
256.4845 -36.5276    6.0  54.1  170.6   2.6919   1.9    6.7	GX 349+2                      
264.7699 -44.3881    8.7  48.5 -178.7   1.0323   1.3    3.9	4U 1735-44                    
147.8684 -53.0299    2.7  24.5   41.5   1.6735   4.2 ------	UNKNOWN                       
109.8060 -78.7349    2.3  12.5  -56.3   1.4755   4.9 ------	UNKNOWN                       
 87.5654 -32.2197    3.1  56.8  -17.4   5.0586   3.8 ------	UNKNOWN                       
 10.5050 -62.4358    3.8  40.7  -92.0   5.6338   3.0 ------	UNKNOWN