batgrbproduct analysis for trigger=895813

batgrbproduct Analysis for Trigger=895813

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): Mon May 20 17:24:09 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger895813
======================================================================

  Trigger: 00895813      Segment: 000

  BAT Trigger Time: 575691300.232   [s; MET]
      Trigger Stop: 575691300.296   [s; MET]
               UTC: 2019-03-31T02:14:37.572780    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 28.5761909565301   Dec: 27.6194435216332  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.8
     Image Trigger?:     NO
     Rate S/N Ratio:     26.0192236625154  [ if not an image trigger ]
     Image S/N Ratio:    8.8

  Flight Position:   [ source = BAT ]
    RA: 28.5761909565301   Dec: 27.6194435216332  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 28.5725445814888   Dec: 27.6354154966189  [deg; J2000]  
        { 01h 54m 17.4s , +27d 38' 07.5" }
         +/- 1.38159534240199 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.628515946292495 [arcmin] (formal 1-sigma fit error)
    SNR: 19.1678893461
 
  Angular difference between Flight and Ground position is 0.977726 arcmin
 
  Partial Coding Fraction: 0.828125    [ including projection effects ]

  Duration
     T90: 4.33599984645844 +/- 0.234776531617368
        Measured from: -0.00399994850158691
                   to: 4.33199989795685     [s; relative to TRIGTIME]
     T50: 1.17599999904633 +/- 1.06831647465854
        Measured from: 0.23199999332428
                   to: 1.40799999237061     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0559999942779541     
                   to: 0.944000005722046     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0559999942779541     
                   to: 4.50399994850159     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.165040   0.243238   0.199876   0.072919
           0.017556   0.019320   0.017939   0.016065 [error]
 Peak      0.084624   0.122249   0.114848   0.033056
           0.009503   0.010236   0.009855   0.008047 [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 4.47e-08 9.62e-08 1.63e-07 6.34e-07 4.47e-07 9.35e-07   erg/cm2
              Error 6.92e-09 8.92e-09 1.75e-08 1.51e-07 4.38e-08 1.63e-07   erg/cm2
Peak flux Power-law 6.89e-01 8.59e-01 7.80e-01 1.23e+00 2.75e+00 3.56e+00   ph/cm2/s
              Error 1.14e-01 8.63e-02 7.80e-02 2.63e-01 2.40e-01 3.35e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.41e-08 9.71e-08 1.64e-07 5.56e-07 4.44e-07 8.62e-07   erg/cm2
              Error 7.37e-09 1.01e-08 1.85e-08 2.14e-07 4.59e-08 3.15e-07   erg/cm2
Peak flux Cutoff-PL 6.74e-01 8.68e-01 7.89e-01 1.08e+00 2.74e+00 3.41e+00   ph/cm2/s
              Error 1.25e-01 9.32e-02 8.80e-02 3.44e-01 2.46e-01 5.06e-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    1.242    0.150    -      -           9.77e-03 8.34e-04   47.270 57
CPL   1.164    0.396     535.7    0.0      1.07e-02 6.47e-03   47.220 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.140    0.150    -      -           2.36e-02 2.02e-03   41.820 57
CPL   1.034    0.375     486.0    0.0      2.66e-02 1.35e-02   41.700 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: 1.344000 sec.
T50 in the 50-300 keV band: 0.896000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    4.560   -0.056    4.504
T90     4.336   -0.004    4.332
T50     1.176    0.232    1.408
Peak    1.000   -0.056    0.944

Click here for the BAT GCN circular template

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
   28.5725    27.6354   0.0101    18.7544   -82.4346         0.6857405     19.168 TRIG_00895813                 
 
Foreground time interval of the image:
 -0.056   4.504 (delta_t =   4.560 [sec])
Background time interval of the image:
-90.931  -0.056 (delta_t =  90.875 [sec])

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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000

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   -0.056 sec. to    4.504 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24158     ( -0.150753   0.149623 )
Norm@50keV  : 9.77481E-03    ( -0.000834544   0.000832677 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.27 using 59 PHA bins.
# Reduced chi-squared =         0.8294 for     57 degrees of freedom 
# Null hypothesis probability =   8.173299e-01
 
Photon flux (15-150 keV)    in 4.56 sec: 1.15454 ( -0.09906  0.09915 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.47131e-07 ( -4.35836e-08  4.40648e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.056 sec. to    4.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16391     ( -0.577209   0.214781 )
Epeak [keV] : 535.688      ( -559.433 -559.433 )
Norm@50keV  : 1.06881E-02    ( -0.00334015   0.00959268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.22 using 59 PHA bins.
# Reduced chi-squared =         0.8431 for     56 degrees of freedom 
# Null hypothesis probability =   7.921655e-01
 
Photon flux (15-150 keV)    in 4.56 sec: 1.15089 ( -0.10221  0.1005 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.44319e-07 ( -4.81372e-08  4.3709e-08 ) ergs/cm2

Band function

Time interval is from   -0.056 sec. to    4.504 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]    : 17.4481  (-2.0733  2.43555)
R^2/D10^2   : 8.10955E-02  (-0.0283774   0.042562)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.24 using 59 PHA bins.
# Reduced chi-squared =          1.425 for     57 degrees of freedom 
# Null hypothesis probability =   1.917657e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.276e-08   3.575e-09
25- 50  1.028e-07   1.252e-08
50-150  2.252e-07   3.721e-08
15-150  3.507e-07   3.917e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-24.5243      -200)
Norm        : 4.71656       (-0.405389     0.405389)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.31 using 59 PHA bins.
# Reduced chi-squared =          1.023 for     57 degrees of freedom 
# Null hypothesis probability =   4.270484e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.355e-08   6.788e-09
25- 50  1.030e-07   2.271e-08
50-150  2.259e-07   1.199e-07
15-150  3.825e-07   1.591e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.68619        (-1.85185      2.26473)
R1^2/D10^2  : 0.798774        (-0.438317      1.19166)
kT2 [keV]   : 33.6920        (-8.57571      21.9052)
R2^2/D10^2  : 7.95335E-03    (-0.00600595   0.0130706)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.53 using 59 PHA bins.
# Reduced chi-squared =         0.8277 for     55 degrees of freedom 
# Null hypothesis probability =   8.150260e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.369e-08   1.776e-08
25- 50  1.001e-07   3.070e-08
50-150  3.071e-07   1.524e-07
15-150  4.508e-07   1.731e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.056 sec. to    0.944 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.13968     ( -0.151296   0.149151 )
Norm@50keV  : 2.36167E-02    ( -0.00202373   0.00202372 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.82 using 59 PHA bins.
# Reduced chi-squared =         0.7337 for     57 degrees of freedom 
# Null hypothesis probability =   9.342561e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.75088 ( -0.24001  0.24022 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.4391e-07 ( -2.36021e-08  2.38033e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.056 sec. to    0.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.03373     ( -0.569059   0.181474 )
Epeak [keV] : 486.027      ( -486.042 -486.042 )
Norm@50keV  : 2.65751E-02    ( -0.00470603   0.0223076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.70 using 59 PHA bins.
# Reduced chi-squared =         0.7446 for     56 degrees of freedom 
# Null hypothesis probability =   9.226100e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.74006 ( -0.24577  0.24563 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.42148e-07 ( -2.54225e-08  2.3802e-08 ) ergs/cm2

Band function

Time interval is from   -0.056 sec. to    0.944 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]    : 19.3786  (-2.37387  2.79061)
R^2/D10^2   : 0.140727  (-0.04919   0.0743888)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.81 using 59 PHA bins.
# Reduced chi-squared =          1.295 for     57 degrees of freedom 
# Null hypothesis probability =   6.639429e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.031e-08   1.887e-09
25- 50  5.029e-08   6.810e-09
50-150  1.393e-07   2.530e-08
15-150  1.999e-07   2.185e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-19.7984      -200)
Norm        : 11.1895       (-0.985333     0.985333)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.26 using 59 PHA bins.
# Reduced chi-squared =          1.075 for     57 degrees of freedom 
# Null hypothesis probability =   3.258726e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.786e-08   7.765e-09
25- 50  5.359e-08   2.762e-08
50-150  1.175e-07   5.264e-08
15-150  1.990e-07   1.073e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.07175        (-1.81544      2.31905)
R1^2/D10^2  : 1.55393        (-0.83608      2.01286)
kT2 [keV]   : 36.8345        (-9.30238      24.4449)
R2^2/D10^2  : 1.55444E-02    (-0.0115747   0.0233481)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.08 using 59 PHA bins.
# Reduced chi-squared =         0.6923 for     55 degrees of freedom 
# Null hypothesis probability =   9.600692e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.131e-08   1.023e-08
25- 50  5.194e-08   1.867e-08
50-150  1.738e-07   8.686e-08
15-150  2.470e-07   9.701e-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: 1.24158     ( -0.150753   0.149623 )
Norm@50keV  : 9.77481E-03    ( -0.000834544   0.000832677 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.27 using 59 PHA bins.
# Reduced chi-squared =         0.8294 for     57 degrees of freedom 
# Null hypothesis probability =   8.173299e-01
 
Photon flux (15-150 keV)    in 4.56 sec: 1.15453 ( -0.0990585  0.0991509 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.47083e-07 ( -4.36536e-08  4.40629e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16397     ( -0.577188   0.214725 )
Epeak [keV] : 537.400      ( -559.476 -559.476 )
Norm@50keV  : 1.06875E-02    ( -0.00333575   0.00959269 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.22 using 59 PHA bins.
# Reduced chi-squared =         0.8431 for     56 degrees of freedom 
# Null hypothesis probability =   7.921819e-01
 
Photon flux (15-150 keV)    in 4.56 sec: 1.15079 ( -0.10219  0.10132 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.44504e-07 ( -4.816e-08  4.60378e-08 ) 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)  = 9.62e-08
S(50-100 keV) = 1.63e-07

T90 vs. Hardness ratio plot

T90                                   = 4.33599984645844 sec.
Hardness ratio (energy fluence ratio) = 1.69439

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.47381
Count Ratio (50-100 keV) / (15-25 keV) = 1.21108

Mask shadow pattern

IMX = 4.470270617610526E-02, IMY = 3.365833946717831E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.064000

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:
-90.931410 -0.056000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6072  22.0155    1.2  38.7  159.4   3.2512   9.2    1.4	Crab                          
326.2628  38.2412    5.2  57.4  -14.2   1.3109   2.2    6.5	Cyg X-2                       
 94.5513  32.2009    2.6  41.1  137.7   2.7692   4.3 ------	UNKNOWN                       
309.5843  65.8650    2.4  54.2   21.2   4.0396   4.7 ------	UNKNOWN                       
 61.4645   3.1113    2.8  41.7 -155.8   1.1003   4.1 ------	UNKNOWN                       
 45.7362   6.4130    2.4  35.3 -132.0   1.0634   4.7 ------	UNKNOWN

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

Time interval of the image:
-0.056000 4.504000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7576  21.9736    9.3  38.8  159.3  -0.0826  -1.2    7.3	Crab                          
326.0284  38.3935  197.6  57.5  -13.9  -0.0084  -0.1    8.0	Cyg X-2                       
334.6650  71.1705    2.4  44.3   25.8   0.3686   4.8 ------	UNKNOWN                       
329.6156  54.2630    2.3  48.8    3.0   0.3553   4.9 ------	UNKNOWN                       
 71.4425  16.8838    2.2  34.3  179.3   0.2365   5.3 ------	UNKNOWN                       
 81.5893  -1.0909    2.0  54.8 -177.3   0.8667   5.6 ------	UNKNOWN                       
 28.5725  27.6354    0.6  18.8  -82.4   0.6858  19.2 ------	UNKNOWN                       
 67.0861  -0.4276    2.2  47.1 -161.4   0.3800   5.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
1079.868590 1093.118000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4187 -40.4834    4.6  50.9  153.7   0.6320   2.5    6.6	Vela X-1                      
154.5654  -0.1507    2.1  28.0   90.4   0.4838   5.5 ------	UNKNOWN                       
 97.5493  37.7934    2.8  39.2  -59.1   0.4185   4.1 ------	UNKNOWN

Plot creation:
Mon Jun 10 17:08:10 EDT 2019