batgrbproduct analysis for trigger=853882

batgrbproduct Analysis for Trigger=853882

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 Oct 19 18:38:35 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger853882
======================================================================

  Trigger: 00853882      Segment: 000

  BAT Trigger Time: 556288240   [s; MET]
      Trigger Stop: 556288368   [s; MET]
               UTC: 2018-08-18T12:30:18.552260    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 104.235169748593   Dec: 39.328619125846  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.17
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.17

  Flight Position:   [ source = BAT ]
    RA: 104.235169748593   Dec: 39.328619125846  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 104.2255323748   Dec: 39.3103621957179  [deg; J2000]  
        { 06h 56m 54.1s , +39d 18' 37.3" }
         +/- 1.65256145493132 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.687718571376997 [arcmin] (formal 1-sigma fit error)
    SNR: 14.8410503592937
 
  Angular difference between Flight and Ground position is 1.183238 arcmin
 
  Partial Coding Fraction: 0.890625    [ including projection effects ]

  Duration
     T90: 137.459999918938 +/- 9.7000667230781
        Measured from: -89.7120000123978
                   to: 47.7479999065399     [s; relative to TRIGTIME]
     T50: 110.439999938011 +/- 4.47276741178899
        Measured from: -80.9279999732971
                   to: 29.5119999647141     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -82.1119999885559     
                   to: -81.1119999885559     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -93.5800000429153     
                   to: 62.7439999580383     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.225750   1.678227   0.883426   0.149702
           0.087604   0.090779   0.078307   0.068087 [error]
 Peak      0.043025   0.066838   0.023112   0.017085
           0.007485   0.008200   0.006842   0.005706 [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 4.13e-07 6.44e-07 7.53e-07 1.70e-06 2.31e-06 3.52e-06   erg/cm2
              Error 4.32e-08 4.34e-08 7.57e-08 3.51e-07 1.78e-07 4.21e-07   erg/cm2
Peak flux Power-law 4.44e-01 3.89e-01 2.34e-01 2.13e-01 1.16e+00 1.28e+00   ph/cm2/s
              Error 1.09e-01 6.35e-02 5.65e-02 1.01e-01 1.88e-01 2.12e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.78e-07 6.97e-07 7.53e-07 5.75e-07 2.16e-06 2.41e-06   erg/cm2
              Error 4.99e-08 5.86e-08 8.52e-08 4.58e-07 2.05e-07 5.00e-07   erg/cm2
Peak flux Cutoff-PL 4.45e-01 3.86e-01 2.33e-01 2.15e-01 1.16e+00 1.28e+00   ph/cm2/s
              Error 1.12e-01 8.45e-02 5.64e-02 1.15e-01 1.89e-01 2.36e-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    1.772    0.120    -      -           1.60e-03 1.19e-04   49.260 57
CPL   1.044    0.559      59.1   24.0      4.00e-03 3.17e-03   43.260 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.732    0.290    -      -           8.62e-03 1.60e-03   64.110 57
CPL   2.007   -0.362       3.0    0.0      6.02e-03 0.00e+00   64.010 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: 154.240000 sec.
T50 in the 50-300 keV band: 115.264000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  156.324  -93.580   62.744
T90   137.460  -89.712   47.748
T50   110.440  -80.928   29.512
Peak    1.000  -82.112  -81.112

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
  104.2255    39.3104   0.0129    29.4210    -8.7127         2.8004309     14.841 TRIG_00853882                 
 
Foreground time interval of the image:
-77.099  62.744 (delta_t = 139.843 [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  -93.580 sec. to   62.744 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.77161     ( -0.118759   0.121149 )
Norm@50keV  : 1.60322E-03    ( -0.000119899   0.000118771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.26 using 59 PHA bins.
# Reduced chi-squared =         0.8642 for     57 degrees of freedom 
# Null hypothesis probability =   7.572781e-01
 
Photon flux (15-150 keV)    in 156.3 sec: 0.218547 ( -0.014892  0.014905 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.30999e-06 ( -1.76999e-07  1.78748e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -93.580 sec. to   62.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.04361     ( -0.598274   0.519354 )
Epeak [keV] : 59.1297      ( -10.6492 37.4506 )
Norm@50keV  : 4.00174E-03    ( -0.00188928   0.00444593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.26 using 59 PHA bins.
# Reduced chi-squared =         0.7724 for     56 degrees of freedom 
# Null hypothesis probability =   8.935343e-01
 
Photon flux (15-150 keV)    in 156.3 sec: 0.211574 ( -0.015679  0.015669 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.1576e-06 ( -2.02946e-07  2.06683e-07 ) ergs/cm2

Band function

Time interval is from  -93.580 sec. to   62.744 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]    : 11.7307  (-0.902485  0.992486)
R^2/D10^2   : 5.74146E-02  (-0.0150594   0.0200661)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.54 using 59 PHA bins.
# Reduced chi-squared =          1.325 for     57 degrees of freedom 
# Null hypothesis probability =   5.065869e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.606e-07   3.165e-08
25- 50  7.983e-07   6.549e-08
50-150  6.504e-07   9.573e-08
15-150  1.709e-06   1.436e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 99.8430       (-19.9173      39.76)
Norm        : 0.969659       (-0.0967825     0.092158)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.79 using 59 PHA bins.
# Reduced chi-squared =         0.7683 for     57 degrees of freedom 
# Null hypothesis probability =   9.004442e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.961e-07   4.611e-08
25- 50  6.848e-07   5.064e-08
50-150  1.109e-06   3.521e-07
15-150  2.190e-06   3.822e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.64171        (-1.68351      1.59226)
R1^2/D10^2  : 0.197123        (-0.0855671      0.22287)
kT2 [keV]   : 24.5351        (-6.69955      16.18)
R2^2/D10^2  : 2.38913E-03    (-0.00198216   0.00653884)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.52 using 59 PHA bins.
# Reduced chi-squared =         0.7731 for     55 degrees of freedom 
# Null hypothesis probability =   8.904826e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.532e-07   8.940e-08
25- 50  7.280e-07   1.862e-07
50-150  1.106e-06   5.163e-07
15-150  2.187e-06   7.378e-07

Peak spectrum fit

Power-law model

Time interval is from  -82.112 sec. to  -81.112 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73154     ( -0.284623   0.294612 )
Norm@50keV  : 8.62467E-03    ( -0.00162044   0.00157474 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.11 using 59 PHA bins.
# Reduced chi-squared =          1.125 for     57 degrees of freedom 
# Null hypothesis probability =   2.413325e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.15842 ( -0.188337  0.18838 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.96856e-08 ( -1.52835e-08  1.56533e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -82.112 sec. to  -81.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.00705     ( -1.2838   -2.00705 )
Epeak [keV] : 2.99380      (   )
Norm@50keV  : 6.02231E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.01 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     56 degrees of freedom 
# Null hypothesis probability =   2.159988e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.15906 ( -0.18907  0.18803 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.00958e-08 ( -1.94864e-08  1.12776e-08 ) ergs/cm2

Band function

Time interval is from  -82.112 sec. to  -81.112 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]    : 9.12194  (-1.39371  1.77107)
R^2/D10^2   : 0.794330  (-0.396035   0.708705)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.22 using 59 PHA bins.
# Reduced chi-squared =          1.214 for     57 degrees of freedom 
# Null hypothesis probability =   1.286217e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.296e-08   3.483e-09
25- 50  2.812e-08   7.610e-09
50-150  1.118e-08   5.223e-09
15-150  5.225e-08   1.296e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 104.675       (-49.3827      -105.386)
Norm        : 5.14103       (-1.04595     1.45389)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.87 using 59 PHA bins.
# Reduced chi-squared =          1.138 for     57 degrees of freedom 
# Null hypothesis probability =   2.214374e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.343e-08   2.951e-09
25- 50  2.344e-08   5.975e-09
50-150  3.897e-08   2.375e-08
15-150  7.585e-08   2.757e-08

Double BB

------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.92606        (-1.19627      1.53826)
R1^2/D10^2  : 1.23764        (-0.668731      1.56776)
kT2 [keV]   : 200.000        (-161.711      -200)
R2^2/D10^2  : 1.50814E-04    (-5.84057e-05   0.000592647)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.32 using 59 PHA bins.
#Fit statistic : Chi-Squared =          53.11 using 59 PHA bins.
# Reduced chi-squared =         0.9694 for     55 degrees of freedom 
# Reduced chi-squared =         0.9656 for     55 degrees of freedom 
# Null hypothesis probability =   5.391909e-01
# Null hypothesis probability =   5.472904e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.427e-08   5.852e-09
25- 50  2.541e-08   1.041e-08
50-150  4.731e-08   3.880e-08
15-150  8.699e-08   4.971e-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: 1.85527     ( -0.156226   0.161962 )
Norm@50keV  : 1.21470E-03    ( -0.000126848   0.000124885 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.78 using 59 PHA bins.
# Reduced chi-squared =         0.8032 for     57 degrees of freedom 
# Null hypothesis probability =   8.565630e-01
 
Photon flux (15-150 keV)    in 139.8 sec: 0.171106 ( -0.0152459  0.0152529 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56133e-06 ( -1.61862e-07  1.64254e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.991055     ( -0.835139   0.689963 )
Epeak [keV] : 50.5758      ( -9.94902 33.6625 )
Norm@50keV  : 3.71530E-03    ( -0.00216573   0.0072771 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.04 using 59 PHA bins.
# Reduced chi-squared =         0.7328 for     56 degrees of freedom 
# Null hypothesis probability =   9.331440e-01
 
Photon flux (15-150 keV)    in 139.8 sec: 0.165486 ( -0.01585  0.015858 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.44103e-06 ( -1.79425e-07  1.87234e-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)  = 6.44e-07
S(50-100 keV) = 7.53e-07

T90 vs. Hardness ratio plot

T90                                   = 137.459999918938 sec.
Hardness ratio (energy fluence ratio) = 1.16925

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.36914
Count Ratio (50-100 keV) / (15-25 keV) = 0.720723

Mask shadow pattern

IMX = 5.574473002885124E-01, IMY = 8.542741209734461E-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:
-77.099400 62.744000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6046  22.0135    1.0  53.4    0.3   5.4893  11.5    1.6	Crab                          
259.0004  66.7174    2.7  46.0  139.2   2.7336   4.2 ------	UNKNOWN                       
104.2255  39.3103    0.8  29.4   -8.7   2.8001  14.8 ------	UNKNOWN                       
 88.9502  21.4470    2.2  51.5   -5.5   2.1671   5.3 ------	UNKNOWN                       
190.1023  23.0934    2.3  51.8 -137.1   4.6773   5.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
192.900600 963.088400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6207  22.0174    0.3  24.7   29.5  31.5076  44.9    0.7	Crab                          
 58.4701  37.0031    2.8  35.7   79.2   6.2993   4.1 ------	UNKNOWN                       
 86.9088 -15.2887    2.7  56.9   -1.9  11.9748   4.3 ------	UNKNOWN                       
203.1833  67.6172    2.7  57.3 -175.4  15.9752   4.2 ------	UNKNOWN                       
125.2390  48.6750    2.8  17.7 -150.8   2.6951   4.1 ------	UNKNOWN                       
 91.9843 -14.6474    2.6  55.2   -7.5   8.5101   4.5 ------	UNKNOWN                       
186.9567  55.1449    3.0  54.8 -158.1  12.7864   3.8 ------	UNKNOWN                       
156.2611  41.7389    3.5  39.0 -132.9   4.1794   3.3 ------	UNKNOWN

Plot creation:
Fri Oct 26 12:35:57 EDT 2018