batgrbproduct analysis for trigger=843211

batgrbproduct Analysis for Trigger=843211

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 (local time): Fri Jul  6 12:02:45 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger843211
======================================================================

  Trigger: 00843211      Segment: 000

  BAT Trigger Time: 551202658.304   [s; MET]
      Trigger Stop: 551202659.328   [s; MET]
               UTC: 2018-06-20T15:50:37.167500    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 357.516541175609   Dec: -57.9572576503267  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    16.36
     Image Trigger?:     NO
     Rate S/N Ratio:     59.042357676502  [ if not an image trigger ]
     Image S/N Ratio:    16.36

  Flight Position:   [ source = BAT ]
    RA: 357.516541175609   Dec: -57.9572576503267  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 357.511569795715   Dec: -57.9551091928789  [deg; J2000]  
        { 23h 50m 02.8s , -57d 57' 18.4" }
         +/- 0.778639997320264 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.274451788947138 [arcmin] (formal 1-sigma fit error)
    SNR: 43.4862194364001
 
  Angular difference between Flight and Ground position is 0.204115 arcmin
 
  Partial Coding Fraction: 0.78125    [ including projection effects ]

  Duration
     T90: 223.96799993515 +/- 26.1326944119251
        Measured from: -118.840000033379
                   to: 105.127999901772     [s; relative to TRIGTIME]
     T50: 43.4159998893738 +/- 4.58923434841652
        Measured from: -3.2039999961853
                   to: 40.2119998931885     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.332000017166138     
                   to: 0.667999982833862     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -159.37600004673     
                   to: 162.427999973297     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.566428   6.256223   4.580516   1.101189
           0.119530   0.119995   0.102970   0.088156 [error]
 Peak      0.079007   0.163107   0.164361   0.052066
           0.008225   0.009349   0.009127   0.006691 [error]

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

======================================================================
 
=== 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   Power-law 1.49e-06 2.61e-06 3.51e-06 9.59e-06 1.02e-05 1.72e-05   erg/cm2
              Error 7.49e-08 7.51e-08 1.08e-07 6.81e-07 2.63e-07 7.35e-07   erg/cm2
Peak flux Power-law 8.81e-01 1.13e+00 1.05e+00 1.73e+00 3.64e+00 4.79e+00   ph/cm2/s
              Error 1.07e-01 8.39e-02 7.00e-02 2.45e-01 2.28e-01 3.08e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.40e-06 2.65e-06 3.57e-06 6.66e-06 9.98e-06 1.43e-05   erg/cm2
              Error 9.69e-08 8.11e-08 1.20e-07 1.62e-06 2.97e-07 1.64e-06   erg/cm2
Peak flux Cutoff-PL 8.15e-01 1.15e+00 1.09e+00 1.29e+00 3.60e+00 4.35e+00   ph/cm2/s
              Error 1.35e-01 9.01e-02 8.83e-02 4.13e-01 2.34e-01 5.34e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.580    0.048    -      -           3.37e-03 8.36e-05   65.940 57
CPL   1.305    0.193     137.1  100.9      4.51e-03 9.09e-04   59.670 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.099    0.104    -      -           3.14e-02 1.91e-03   53.150 57
CPL   0.799    0.385     231.9    0.0      4.27e-02 0.00e+00   51.470 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 165.952000 sec.
T50 in the 50-300 keV band: 33.216000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  321.804 -159.376  162.428
T90   223.968 -118.840  105.128
T50    43.416   -3.204   40.212
Peak    1.000   -0.332    0.668

Click here for the BAT GCN circular template

Special notes of this burst

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  357.5116   -57.9551   0.0044    30.3956  -176.7104        10.2661375     43.486 TRIG_00843211                 
 
Foreground time interval of the image:
-158.203  16.797 (delta_t = 175.000 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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 -159.376 sec. to  162.428 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.58023     ( -0.0476638   0.0476839 )
Norm@50keV  : 3.37104E-03    ( -8.35712e-05   8.35664e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.94 using 59 PHA bins.
# Reduced chi-squared =          1.157 for     57 degrees of freedom 
# Null hypothesis probability =   1.950995e-01
 
Photon flux (15-150 keV)    in 321.8 sec: 0.430598 ( -0.012073  0.012118 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01717e-05 ( -2.62374e-07  2.62862e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from -159.376 sec. to  162.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30546     ( -0.197141   0.188844 )
Epeak [keV] : 137.135      ( -35.5131 166.33 )
Norm@50keV  : 4.51152E-03    ( -0.000799035   0.00101921 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.67 using 59 PHA bins.
# Reduced chi-squared =          1.066 for     56 degrees of freedom 
# Null hypothesis probability =   3.438031e-01
 
Photon flux (15-150 keV)    in 321.8 sec: 0.421092 ( -0.01353  0.013599 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.96911e-06 ( -2.97112e-07  2.96297e-07 ) ergs/cm2

Band function

Time interval is from -159.376 sec. to  162.428 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 16.0694  (  )
R^2/D10^2   : 3.58698E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         375.33 using 59 PHA bins.
# Reduced chi-squared =         6.5847 for     57 degrees of freedom 
# Null hypothesis probability =   2.117418e-48
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.157e-07   2.928e-08
25- 50  2.600e-06   9.268e-08
50-150  4.701e-06   2.253e-07
15-150  7.918e-06   2.156e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-22.9148      -200)
Norm        : 1.73150       (-0.0428522     0.0428522)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.84 using 59 PHA bins.
# Reduced chi-squared =          1.050 for     57 degrees of freedom 
# Null hypothesis probability =   3.729318e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.388e-06   4.183e-08
25- 50  2.670e-06   7.482e-08
50-150  5.855e-06   1.641e-07
15-150  9.913e-06   2.944e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.54517        (-0.670889      0.70902)
R1^2/D10^2  : 0.339717        (-0.0887463      0.130759)
kT2 [keV]   : 27.2494        (-2.35292      3.01799)
R2^2/D10^2  : 4.38601E-03    (-0.00139309   0.0017645)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.22 using 59 PHA bins.
# Reduced chi-squared =          1.095 for     55 degrees of freedom 
# Null hypothesis probability =   2.925912e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.247e-06   1.015e-07
25- 50  2.720e-06   1.511e-07
50-150  5.923e-06   4.344e-07
15-150  9.890e-06   5.632e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.332 sec. to    0.668 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.09862     ( -0.104505   0.103499 )
Norm@50keV  : 3.14154E-02    ( -0.00190835   0.0019053 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.15 using 59 PHA bins.
# Reduced chi-squared =         0.9324 for     57 degrees of freedom 
# Null hypothesis probability =   6.203525e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.64350 ( -0.22821  0.22853 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.28632e-07 ( -2.14753e-08  2.1555e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.332 sec. to    0.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.799176     ( -0.428472   0.341989 )
Epeak [keV] : 231.874      (   )
Norm@50keV  : 4.27352E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.47 using 59 PHA bins.
# Reduced chi-squared =         0.9190 for     56 degrees of freedom 
# Null hypothesis probability =   6.469605e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.60317 ( -0.23406  0.23429 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.25095e-07 ( -2.22782e-08  2.22012e-08 ) ergs/cm2

Band function

Time interval is from   -0.332 sec. to    0.668 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 21.3442  (-1.70124  1.89869)
R^2/D10^2   : 0.141240  (-0.0338165   0.0434561)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          99.11 using 59 PHA bins.
# Reduced chi-squared =          1.739 for     57 degrees of freedom 
# Null hypothesis probability =   4.633599e-04
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.207e-08   1.560e-09
25- 50  6.267e-08   5.505e-09
50-150  2.131e-07   2.015e-08
15-150  2.878e-07   2.065e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-9.07239      -200)
Norm        : 15.0546       (-0.939847     0.939847)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         104.69 using 59 PHA bins.
# Reduced chi-squared =         1.8367 for     57 degrees of freedom 
# Null hypothesis probability =   1.214563e-04
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.750e-08   2.660e-09
25- 50  7.213e-08   5.940e-09
50-150  1.582e-07   3.300e-08
15-150  2.678e-07   4.515e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.23156        (-1.75138      2.1323)
R1^2/D10^2  : 1.60951        (-0.797715      1.87656)
kT2 [keV]   : 33.1665        (-5.43916      9.61547)
R2^2/D10^2  : 2.93653E-02    (-0.0162622   0.0241451)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.65 using 59 PHA bins.
# Reduced chi-squared =         0.9027 for     55 degrees of freedom 
# Null hypothesis probability =   6.785260e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.487e-08   9.179e-09
25- 50  6.740e-08   1.660e-08
50-150  2.363e-07   7.035e-08
15-150  3.286e-07   8.645e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.44365     ( -0.0550475   0.0549411 )
Norm@50keV  : 3.89529E-03    ( -0.000116192   0.00011619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.07 using 59 PHA bins.
# Reduced chi-squared =          1.159 for     57 degrees of freedom 
# Null hypothesis probability =   1.922042e-01
 
Photon flux (15-150 keV)    in 175 sec: 0.479289 ( -0.0157844  0.0158333 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.53082e-06 ( -2.0457e-07  2.0485e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.987859     ( -0.237353   0.225495 )
Epeak [keV] : 122.548      ( -24.0577 63.6598 )
Norm@50keV  : 6.28203E-03    ( -0.00129042   0.00171938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.56 using 59 PHA bins.
# Reduced chi-squared =         0.9565 for     56 degrees of freedom 
# Null hypothesis probability =   5.676334e-01
 
Photon flux (15-150 keV)    in 175 sec: 0.464239 ( -0.017193  0.017263 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.34678e-06 ( -2.25593e-07  2.24945e-07 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 2.61e-06
S(50-100 keV) = 3.51e-06

T90 vs. Hardness ratio plot

T90                                   = 223.96799993515 sec.
Hardness ratio (energy fluence ratio) = 1.34483

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.37005
Count Ratio (50-100 keV) / (15-25 keV) = 1.00309

Mask shadow pattern

IMX = -5.856277205807686E-01, IMY = 3.366015288200561E-02

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:

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

Time interval of the image:
-158.203400 16.796600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.3036 -60.6104    2.1  32.3  -20.0   1.2916   5.5    0.8	Cen X-3                       
186.5955 -62.6226    5.1  29.0   -5.7   0.5148   2.2    9.0	GX 301-2                      
215.3303 -62.6987    2.0  26.3   22.1   1.3681   5.9 ------	UNKNOWN                       
357.5116 -57.9551    0.3  30.4 -176.7  10.2658  43.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
71.996590 842.808900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
345.6194 -40.7620    2.9  18.8  162.8   2.1724   4.0 ------	UNKNOWN                       
 56.3049 -39.6568    3.7  41.2  -78.2   8.7968   3.1 ------	UNKNOWN

Plot creation:
Fri Jul  6 14:34:33 EDT 2018