GRB190512A

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 19:08:14 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger903357
======================================================================

  Trigger: 00903357      Segment: 000

  BAT Trigger Time: 579364832   [s; MET]
      Trigger Stop: 579364896   [s; MET]
               UTC: 2019-05-12T14:40:09.107780    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 82.4400244290381   Dec: -7.57402254090285  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.64
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    9.64

  Analysis Position:   [ source = BAT ]
    RA: 82.4400244290381   Dec: -7.57402254090285  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 82.3973785426688   Dec: -7.58178513839831  [deg; J2000]  
        { 05h 29m 35.4s , -07d 34' 54.4" }
         +/- 2.86802287504815 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.73662121139206 [arcmin] (formal 1-sigma fit error)
    SNR: 6.75194562021472
 
  Angular difference between the analysis and refined position is 2.578815 arcmin
 
  Partial Coding Fraction: 0.8359375    [ including projection effects ]

  Duration
     T90: 40.0719999074936 +/- 11.3308527627815
        Measured from: -8.18799996376038
                   to: 31.8839999437332     [s; relative to TRIGTIME]
     T50: 15.5439999103546 +/- 2.33924436569555
        Measured from: -2.80799996852875
                   to: 12.7359999418259     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -2.78400003910065     
                   to: -1.78400003910065     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -9.70000004768372     
                   to: 43.2999999523163     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.972888   0.972058   0.428424   0.097348
           0.059371   0.061363   0.052518   0.043836 [error]
 Peak      0.032999   0.045290   0.031513   0.023740
           0.008240   0.008803   0.007299   0.006442 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   53.000   -9.700   43.300
T90    40.072   -8.188   31.884
T50    15.544   -2.808   12.736
Peak    1.000   -2.784   -1.784
 
 
====== 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      -2.060    -0.148      0.142       -           -               -         2.62e-03     -2.54e-04          2.50e-04      46.820   57
CPL     -1.530    -0.593      0.717       35.763      N/A           N/A         5.37e-03        N/A               N/A         44.530   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      -1.463     -0.357     0.351       -           -               -         7.76e-03     -1.65e-03          1.63e-03      58.960   57
CPL     -1.278     -1.489     1.803      192.037    -192.037      -192.037      9.69e-03     -9.69e-03          7.16e-02      58.920   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   3.00e-07  3.93e-07  3.77e-07  6.43e-07  1.28e-06  1.71e-06   erg/cm2
      90%_error_low -3.15e-08 -2.95e-08 -4.99e-08 -1.54e-07 -1.14e-07 -2.14e-07   erg/cm2
      90%_error_hi   3.22e-08  2.94e-08  5.09e-08  1.84e-07  1.16e-07  2.36e-07   erg/cm2
Peak flux       PL   3.08e-01  3.17e-01  2.30e-01  2.68e-01  9.60e-01  1.12e+00   ph/cm2/s
      90%_error_low -1.03e-01 -7.03e-02 -6.07e-02 -1.20e-01 -2.00e-01 -2.35e-01   ph/cm2/s
      90%_error_hi   1.12e-01  6.90e-02  5.95e-02  1.66e-01  2.00e-01  2.38e-01   ph/cm2/s
 
Fluence        CPL   2.88e-07  4.18e-07  3.62e-07  2.47e-07  1.21e-06  1.32e-06   erg/cm2
      90%_error_low -3.50e-08 -4.01e-08 -6.24e-08 -1.59e-07 -1.37e-07 -2.17e-07   erg/cm2
      90%_error_hi   3.51e-08  4.15e-08  5.74e-08  4.77e-07  1.42e-07  4.76e-07   erg/cm2
Peak flux      CPL   3.00e-01  3.24e-01  2.34e-01  2.13e-01  9.55e-01  1.07e+00   ph/cm2/s
      90%_error_low -1.23e-01 -7.65e-02 -6.39e-02 -2.13e-01 -2.05e-01 -2.91e-01   ph/cm2/s
      90%_error_hi   1.08e-01  9.11e-02  6.95e-02  2.13e-01  2.03e-01  2.86e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   82.3974    -7.5818   0.0287    22.1216   -49.7714         1.9625692      6.752 TRIG_00903357                 
 
Foreground time interval of the image:
 -9.700  43.300 (delta_t =  53.000 [sec])
Background time interval of the image:
-17.899  -9.700 (delta_t =   8.199 [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

Bokeh Plot

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   -9.700 sec. to   43.300 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.06024     ( -0.147996   0.142196 )
Norm@50keV  : 2.61634E-03    ( -0.000254264   0.000250121 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.82 using 59 PHA bins.
# Reduced chi-squared =         0.8213 for     57 degrees of freedom 
# Null hypothesis probability =   8.299497e-01
 
Photon flux (15-150 keV)    in 53 sec: 0.403757 ( -0.030111  0.030121 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.28409e-06 ( -1.1382e-07  1.15742e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -9.700 sec. to   43.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52999     ( -0.592917   0.716437 )
Epeak [keV] : 35.7634      (   )
Norm@50keV  : 5.36811E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.53 using 59 PHA bins.
# Reduced chi-squared =         0.7952 for     56 degrees of freedom 
# Null hypothesis probability =   8.651581e-01
 
Photon flux (15-150 keV)    in 53 sec: 0.394777 ( -0.031723  0.031697 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20842e-06 ( -1.36734e-07  1.4187e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -2.784 sec. to   -1.784 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.46319     ( -0.356565   0.35128 )
Norm@50keV  : 7.76256E-03    ( -0.0016475   0.00162861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.96 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     57 degrees of freedom 
# Null hypothesis probability =   4.035344e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.959819 ( -0.200077  0.200371 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.4114e-08 ( -1.70949e-08  1.73436e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.784 sec. to   -1.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27769     ( -1.4871   1.80479 )
Epeak [keV] : 192.037      ( -193.861 -193.861 )
Norm@50keV  : 9.69491E-03    ( -0.00966874   0.07162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.92 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     56 degrees of freedom 
# Null hypothesis probability =   3.693451e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.954814 ( -0.204633  0.203196 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.31661e-08 ( -1.89373e-08  1.80959e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 40.072 sec.
Hardness ratio (energy fluence ratio) = 0.959135652967

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

S(15-50 keV)  = 6.936163e-07
S(50-150 keV) = 5.904817e-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 = 2.625318684392497E-01, IMY = 3.103504432378429E-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:
-17.899410 -9.700000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7099  21.9791    6.4  51.4  -41.7   0.3722   1.8    4.8	Crab                          
 14.0042 -62.8818    3.1  56.4  173.5   0.9215   3.7 ------	UNKNOWN

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

Time interval of the image:
-9.700000 43.300000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5348  22.0846    5.8  51.5  -42.0   2.7243   2.0    6.9	Crab                          
 94.4976 -74.5669    2.7  45.4  138.9   5.2972   4.3 ------	UNKNOWN                       
122.8706 -42.8527    2.7  31.8   86.9   2.7237   4.3 ------	UNKNOWN                       
114.1019 -51.8015    2.7  30.3  107.5   2.4254   4.2 ------	UNKNOWN                       
 82.3974  -7.5817    1.7  22.1  -49.8   1.9609   6.8 ------	UNKNOWN                       
 52.6476  -4.2946    2.0  40.9  -97.0   6.8191   5.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
103.900600 197.900600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4570 -40.5152   10.1  36.6   72.9   0.7454   1.1    4.0	Vela X-1                      
 39.3753 -41.9251    2.3  38.1 -152.8   1.3112   5.2 ------	UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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