GRB190109B

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: Sun Mar 17 22:53:57 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger882809
======================================================================

  Trigger: 00882809      Segment: 000

  BAT Trigger Time: 568727791.424   [s; MET]
      Trigger Stop: 568727792.448   [s; MET]
               UTC: 2019-01-09T11:56:09.203160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 55.5953879141201   Dec: 63.5778852049672  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.64
     Image Trigger?:     NO
     Rate S/N Ratio:     15.0332963783729  [ if not an image trigger ]
     Image S/N Ratio:    8.64

  Analysis Position:   [ source = BAT ]
    RA: 55.5953879141201   Dec: 63.5778852049672  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 55.5531692571662   Dec: 63.595502333732  [deg; J2000]  
        { 03h 42m 12.8s , +63d 35' 43.8" }
         +/- 1.42340065785624 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.558298739749023 [arcmin] (formal 1-sigma fit error)
    SNR: 18.3687488754915
 
  Angular difference between the analysis and refined position is 1.545017 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 6.51199996471405 +/- 0.79070601675249
        Measured from: -3.56000006198883
                   to: 2.95199990272522     [s; relative to TRIGTIME]
     T50: 2.81599986553192 +/- 0.862229655679745
        Measured from: -1.19599997997284
                   to: 1.61999988555908     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.124000072479248     
                   to: 0.875999927520752     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.25999999046326     
                   to: 3.30799996852875     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.228417   0.280549   0.213941   0.054848
           0.023925   0.024257   0.020550   0.016799 [error]
 Peak      0.056678   0.068414   0.060676   0.010642
           0.009377   0.009620   0.008211   0.006128 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    7.568   -4.260    3.308
T90     6.512   -3.560    2.952
T50     2.816   -1.196    1.620
Peak    1.000   -0.124    0.876
 
 
====== 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      -1.591    -0.160      0.158       -           -               -         6.73e-03     -6.40e-04          6.36e-04      65.690   57
CPL     -1.217    -0.455      0.716      101.068     -39.385      -101.068      1.06e-02     -4.31e-03          1.40e-02      64.650   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      -1.515     -0.230     0.227       -           -               -         1.34e-02     -1.86e-03          1.85e-03      63.350   57
CPL     -1.131     -0.454     0.959      112.562     -51.879      -112.562      2.10e-02     -9.27e-03          4.26e-02      62.700   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-08  1.23e-07  1.64e-07  4.43e-07  4.77e-07  8.01e-07   erg/cm2
      90%_error_low -1.05e-08 -1.16e-08 -2.04e-08 -1.06e-07 -4.85e-08 -1.25e-07   erg/cm2
      90%_error_hi   1.09e-08  1.15e-08  2.03e-08  1.27e-07  4.90e-08  1.41e-07   erg/cm2
Peak flux       PL   5.58e-01  5.56e-01  3.89e-01  4.31e-01  1.67e+00  1.93e+00   ph/cm2/s
      90%_error_low -1.24e-01 -8.07e-02 -6.73e-02 -1.33e-01 -2.31e-01 -2.65e-01   ph/cm2/s
      90%_error_hi   1.31e-01  7.99e-02  6.65e-02  1.65e-01  2.32e-01  2.66e-01   ph/cm2/s
 
Fluence        CPL   6.71e-08  1.28e-07  1.67e-07  2.49e-07  4.63e-07  6.11e-07   erg/cm2
      90%_error_low -1.23e-08 -1.44e-08 -2.16e-08 -1.46e-07 -5.46e-08 -1.56e-07   erg/cm2
      90%_error_hi   1.24e-08  1.49e-08  2.20e-08  2.30e-07  5.44e-08  2.43e-07   erg/cm2
Peak flux      CPL   5.23e-01  5.79e-01  4.03e-01  2.79e-01  1.65e+00  1.78e+00   ph/cm2/s
      90%_error_low -1.43e-01 -9.33e-02 -7.36e-02 -1.69e-01 -2.36e-01 -3.03e-01   ph/cm2/s
      90%_error_hi   1.48e-01  9.78e-02  7.63e-02  2.04e-01  2.36e-01  3.26e-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
   55.5532    63.5955   0.0105    28.7958    31.2639         0.8041735     18.369 TRIG_00882809                 
 
Foreground time interval of the image:
 -4.260   3.308 (delta_t =   7.568 [sec])
Background time interval of the image:
-239.424  -4.260 (delta_t = 235.164 [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   -4.260 sec. to    3.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.59103     ( -0.159718   0.157829 )
Norm@50keV  : 6.73366E-03    ( -0.000640211   0.000635611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.69 using 59 PHA bins.
# Reduced chi-squared =          1.152 for     57 degrees of freedom 
# Null hypothesis probability =   2.011149e-01
 
Photon flux (15-150 keV)    in 7.568 sec: 0.862949 ( -0.079953  0.080062 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.77179e-07 ( -4.85011e-08  4.90213e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.260 sec. to    3.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21736     ( -0.454527   0.71624 )
Epeak [keV] : 101.068      ( -39.3872 -101.07 )
Norm@50keV  : 1.05521E-02    ( -0.00430543   0.0139967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.65 using 59 PHA bins.
# Reduced chi-squared =          1.154 for     56 degrees of freedom 
# Null hypothesis probability =   2.002077e-01
 
Photon flux (15-150 keV)    in 7.568 sec: 0.849427 ( -0.083486  0.083066 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.62776e-07 ( -5.46158e-08  5.44386e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.124 sec. to    0.876 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51542     ( -0.229944   0.227149 )
Norm@50keV  : 1.33518E-02    ( -0.00186385   0.00185082 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.35 using 59 PHA bins.
# Reduced chi-squared =          1.111 for     57 degrees of freedom 
# Null hypothesis probability =   2.624219e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.67388 ( -0.23135  0.23171 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26366e-07 ( -1.90165e-08  1.92034e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.124 sec. to    0.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.13125     ( -0.453801   0.958755 )
Epeak [keV] : 112.562      ( -51.8791 -112.562 )
Norm@50keV  : 2.10264E-02    ( -0.00927163   0.0426193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.70 using 59 PHA bins.
# Reduced chi-squared =          1.120 for     56 degrees of freedom 
# Null hypothesis probability =   2.507521e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.65283 ( -0.23597  0.23595 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.23254e-07 ( -2.04169e-08  2.03181e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 6.512 sec.
Hardness ratio (energy fluence ratio) = 1.32776083156

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

S(15-50 keV)  = 1.9407815e-07
S(50-150 keV) = 2.831033e-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 = 4.698404545818621E-01, IMY = -2.852622809348173E-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:
-239.424000 -4.260000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 40.9369  61.4302    0.5  23.8   19.9   5.3637  24.3 ------	UNKNOWN                       
349.2280  75.7389    2.7  42.5   -4.0   1.4761   4.3 ------	UNKNOWN                       
 36.8211  -4.6307    2.4  42.9 -174.6   1.9713   4.9 ------	UNKNOWN

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

Time interval of the image:
-4.260000 3.308000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 55.5532  63.5955    0.6  28.8   31.3   0.8040  18.4 ------	UNKNOWN                       
333.7544  50.9720    2.3  43.0  -41.9   0.3348   5.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
71.076600 962.660900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
159.9101  56.8508    2.8  46.4   25.0   5.6112   4.1 ------	UNKNOWN                       
 97.5659  61.3008    3.4  19.2   55.6   2.4457   3.4 ------	UNKNOWN                       
 40.9262  61.4328    0.3   7.1 -123.1  21.2468  35.3 ------	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