GRB190202A

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 Mar 21 17:08:32 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger887217
======================================================================

  Trigger: 00887217      Segment: 000

  BAT Trigger Time: 570764392.704   [s; MET]
      Trigger Stop: 570764395.776   [s; MET]
               UTC: 2019-02-02T01:39:30.355340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 166.512275970226   Dec: 9.38809738122639  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.85
     Image Trigger?:     NO
     Rate S/N Ratio:     68.0661443009665  [ if not an image trigger ]
     Image S/N Ratio:    7.85

  Analysis Position:   [ source = BAT ]
    RA: 166.512275970226   Dec: 9.38809738122639  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 166.505509020556   Dec: 9.39026649349575  [deg; J2000]
        { 11h 06m 01.3s , +09d 23' 25.0" }
         +/- 1.74048997619557 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.750723497980808 [arcmin] (formal 1-sigma fit error)
    SNR: 13.7816721276957
 
  Angular difference between the analysis and refined position is 0.4236 arcmin
 
  Partial Coding Fraction: 0.04492188    [ including projection effects ]

  Duration
     T90: 15.9999998807907 +/- 5.27495512093061
        Measured from: -2.1360000371933
                   to: 13.8639998435974     [s; relative to TRIGTIME]
     T50: 6.52799987792969 +/- 2.0339517767937
        Measured from: 1.19200003147125
                   to: 7.71999990940094     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.69200003147125     
                   to: 5.69200003147125     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.82400000095367     
                   to: 23.3999999761581     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.669658   3.111241   3.121640   1.166648
           0.205915   0.234521   0.221021   0.174580 [error]
 Peak      0.189556   0.365042   0.349911   0.193793
           0.046523   0.060386   0.060212   0.047334 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   28.224   -4.824   23.400
T90    16.000   -2.136   13.864
T50     6.528    1.192    7.720
Peak    1.000    4.692    5.692
 
 
====== 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      -1.318    -0.127      0.128       -           -               -         2.33e-02     -1.81e-03          1.81e-03      48.410   57
CPL     -0.772    -0.492      0.553      128.938     -38.683       484.452      4.12e-02     -1.62e-02          3.02e-02      44.770   56
 
 
=== 1-s peak 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      -1.244     -0.281     0.285       -           -               -         6.93e-02     -1.25e-02          1.25e-02      50.920   57
CPL     -0.110     -1.248     2.011       84.859     -26.885       -84.859      2.59e-01     -2.59e-01          2.18e+00      49.100   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   7.09e-07  1.46e-06  2.34e-06  8.38e-06  6.48e-06  1.29e-05   erg/cm2
      90%_error_low -1.01e-07 -1.31e-07 -2.08e-07 -1.51e-06 -5.28e-07 -1.65e-06   erg/cm2
      90%_error_hi   1.05e-07  1.30e-07  2.07e-07  1.70e-06  5.29e-07  1.81e-06   erg/cm2
Peak flux       PL   4.10e-04  5.12e-03  5.00e-02  4.99e+00  2.62e-01  4.99e+00   ph/cm2/s
      90%_error_low -7.33e-05 -9.49e-04 -2.87e-03 -8.98e-01 -4.79e-02 -8.44e-01   ph/cm2/s
      90%_error_hi   7.09e-04  7.19e-03  7.33e-02  3.68e+00  2.64e-01  3.86e+00   ph/cm2/s
 
Fluence        CPL   6.23e-07  1.52e-06  2.50e-06  4.53e-06  6.39e-06  9.17e-06   erg/cm2
      90%_error_low -1.23e-07 -1.46e-07 -2.53e-07 -1.82e-06 -5.42e-07 -1.86e-06   erg/cm2
      90%_error_hi   1.28e-07  1.49e-07  2.59e-07  3.38e-06  5.42e-07  3.32e-06   erg/cm2
Peak flux      CPL   1.84e+00  2.95e+00  2.47e+00  1.12e+00  8.03e+00  8.38e+00   ph/cm2/s
      90%_error_low -8.21e-01 -6.83e-01 -5.73e-01 -1.12e+00 -1.54e+00 -1.78e+00   ph/cm2/s
      90%_error_hi   8.64e-01  7.35e-01  6.01e-01  2.51e+00  1.53e+00  2.86e+00   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
  166.5055     9.3903   0.0140    49.5442   141.5722         8.5552557     13.782 TRIG_00887217                 
 
Foreground time interval of the image:
 -2.920  30.328 (delta_t =  33.248 [sec])
Background time interval of the image:
-64.803  -2.920 (delta_t =  61.883 [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   -4.824 sec. to   23.400 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.31763     ( -0.127183   0.127937 )
Norm@50keV  : 2.33302E-02    ( -0.0018084   0.00180763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.41 using 59 PHA bins.
# Reduced chi-squared =         0.8492 for     57 degrees of freedom 
# Null hypothesis probability =   7.840672e-01
 
Photon flux (15-150 keV)    in 28.22 sec: 2.79262 ( -0.22997  0.23064 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.47928e-06 ( -5.27638e-07  5.29246e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.824 sec. to   23.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.772011     ( -0.491766   0.553302 )
Epeak [keV] : 128.938      ( -38.6826 484.452 )
Norm@50keV  : 4.11529E-02    ( -0.0161518   0.0302104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.77 using 59 PHA bins.
# Reduced chi-squared =         0.7994 for     56 degrees of freedom 
# Null hypothesis probability =   8.594822e-01
 
Photon flux (15-150 keV)    in 28.22 sec: 2.73545 ( -0.23542  0.23606 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.38847e-06 ( -5.42228e-07  5.4159e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    4.692 sec. to    5.692 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.24425     ( -0.281102   0.285079 )
Norm@50keV  : 6.92935E-02    ( -0.0125287   0.0125061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.92 using 59 PHA bins.
# Reduced chi-squared =         0.8934 for     57 degrees of freedom 
# Null hypothesis probability =   7.011137e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.261640 ( -0.047906  0.263884 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.94624e-07 ( -1.37528e-07  1.38577e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    4.692 sec. to    5.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.110338     ( -1.24795   2.01023 )
Epeak [keV] : 84.8590      ( -26.87 -84.8435 )
Norm@50keV  : 0.258821    ( -0.25897   2.17955 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.10 using 59 PHA bins.
# Reduced chi-squared =         0.8767 for     56 degrees of freedom 
# Null hypothesis probability =   7.315538e-01
 
Photon flux (15-150 keV)    in 1 sec: 8.03356 ( -1.53841  1.52778 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.54953e-07 ( -1.48441e-07  1.50221e-07 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 16.0 sec.
Hardness ratio (energy fluence ratio) = 1.60479696461

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

S(15-50 keV)  = 2.16521e-06
S(50-150 keV) = 4.314034e-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 = -9.186677255588864E-01, IMY = -7.288537295523887E-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:
-64.803400 -4.824000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6322  22.0241    0.8  39.1    8.2   2.3693  14.9    0.6	Crab                          
135.7083 -40.4491    5.9  44.6 -136.7   0.5055   2.0   10.4	Vela X-1                      
125.6770   1.3470    2.5   8.3  150.3   0.4910   4.6 ------	UNKNOWN                       
143.9096 -45.4563    2.9  52.0 -140.3   2.2410   3.9 ------	UNKNOWN

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

Time interval of the image:
-4.824000 23.400000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5439  21.9178    4.2  39.1    8.0  -0.3665  -2.8    7.6	Crab                          
135.5019 -40.6665    3.9  44.7 -136.4   0.6329   3.0    6.8	Vela X-1                      
159.2365  17.3713    4.0  44.3  128.9   1.5470   2.9 ------	UNKNOWN                       
166.5050   9.3930    0.9  49.5  141.6   9.3132  12.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
150.796590 962.459800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
173.7104  22.4132    3.7  14.8 -170.0   2.5422   3.1 ------	UNKNOWN                       
188.1082 -18.8227    3.5  35.3  -54.2   5.4196   3.3 ------	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