batgrbproduct analysis for trigger=766081

batgrbproduct Analysis for Trigger=766081

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 Sep 11 17:20:59 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger766081
======================================================================

  Trigger: 00766081      Segment: 000

  BAT Trigger Time: 523474246.644   [s; MET]
      Trigger Stop: 523474246.708   [s; MET]
               UTC: 2017-08-03T17:30:27.173280    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 174.949880933376   Dec: -16.3107712626632  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.73
     Image Trigger?:     NO
     Rate S/N Ratio:     32.6036807738022  [ if not an image trigger ]
     Image S/N Ratio:    10.73

  Flight Position:   [ source = BAT ]
    RA: 174.949880933376   Dec: -16.3107712626632  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 174.947690607081   Dec: -16.3112304817445  [deg; J2000]  
        { 11h 39m 47.4s , -16d 18' 40.4" }
         +/- 0.769239298439966 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.264968731410357 [arcmin] (formal 1-sigma fit error)
    SNR: 44.2473961266501
 
  Angular difference between Flight and Ground position is 0.129105 arcmin
 
  Partial Coding Fraction: 0.9453125    [ including projection effects ]

  Duration
     T90: 3.81999999284744 +/- 0.236812129310609
        Measured from: -0.188000023365021
                   to: 3.63199996948242     [s; relative to TRIGTIME]
     T50: 1.61199992895126 +/- 0.0809938026694786
        Measured from: 0.216000020503998
                   to: 1.82799994945526     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.11599999666214     
                   to: 0.88400000333786     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.691999971866608     
                   to: 4.14399999380112     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.351271   0.572649   0.526022   0.116623
           0.015775   0.017379   0.015858   0.011834 [error]
 Peak      0.153312   0.286924   0.303703   0.082181
           0.008281   0.010035   0.010110   0.006809 [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 1.14e-07 2.36e-07 3.83e-07 1.39e-06 1.06e-06 2.12e-06   erg/cm2
              Error 7.62e-09 9.36e-09 1.54e-08 1.26e-07 3.88e-08 1.35e-07   erg/cm2
Peak flux Power-law 4.30e-04 6.94e-03 8.08e-02 6.69e+00 3.53e-01 4.17e+00   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 9.96e-08 2.45e-07 4.03e-07 7.16e-07 1.03e-06 1.46e-06   erg/cm2
              Error 9.69e-09 1.05e-08 1.83e-08 2.05e-07 4.17e-08 2.05e-07   erg/cm2
Peak flux Cutoff-PL 1.38e+00 2.08e+00 2.01e+00 1.90e+00 6.40e+00 7.36e+00   ph/cm2/s
              Error 1.48e-01 1.01e-01 1.00e-01 4.27e-01 2.60e-01 4.99e-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    1.306    0.060    -      -           2.22e-02 7.55e-04   55.070 57
CPL   0.749    0.264     126.1   41.0      3.96e-02 1.07e-02   40.420 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.102    0.064    -      -           5.62e-02 2.12e-03   68.270 57
CPL   0.564    0.267     153.9   59.5      9.77e-02 2.64e-02   54.910 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: 3.456000 sec.
T50 in the 50-300 keV band: 1.280000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    4.836   -0.692    4.144
T90     3.820   -0.188    3.632
T50     1.612    0.216    1.828
Peak    1.000   -0.116    0.884

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
  174.9477   -16.3112   0.0043    26.2826    -9.7529         1.5687024     44.247 TRIG_00766081                 
 
Foreground time interval of the image:
 -0.692   4.144 (delta_t =   4.836 [sec])
Background time interval of the image:
-18.943  -0.692 (delta_t =  18.251 [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   -0.692 sec. to    4.144 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30595     ( -0.0604793   0.0603959 )
Norm@50keV  : 2.22008E-02    ( -0.000754764   0.000754738 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.07 using 59 PHA bins.
# Reduced chi-squared =         0.9661 for     57 degrees of freedom 
# Null hypothesis probability =   5.479774e-01
 
Photon flux (15-150 keV)    in 4.836 sec: 2.65156 ( -0.09573  0.09592 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.05954e-06 ( -3.87253e-08  3.88001e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.692 sec. to    4.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.749432     ( -0.271344   0.255998 )
Epeak [keV] : 126.124      ( -23.965 58.1178 )
Norm@50keV  : 3.95934E-02    ( -0.00902869   0.0124586 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.42 using 59 PHA bins.
# Reduced chi-squared =         0.7217 for     56 degrees of freedom 
# Null hypothesis probability =   9.420539e-01
 
Photon flux (15-150 keV)    in 4.836 sec: 2.56941 ( -0.10187  0.10222 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02867e-06 ( -4.1786e-08  4.16561e-08 ) ergs/cm2

Band function

Time interval is from   -0.692 sec. to    4.144 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]    : 18.5230  (  )
R^2/D10^2   : 0.153221  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         156.89 using 59 PHA bins.
# Reduced chi-squared =         2.7524 for     57 degrees of freedom 
# Null hypothesis probability =   2.866931e-11
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.042e-08   3.467e-09
25- 50  2.381e-07   1.115e-08
50-150  5.972e-07   3.216e-08
15-150  8.858e-07   3.627e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-5.42846      -200)
Norm        : 11.1454       (-0.382237     0.382237)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          96.99 using 59 PHA bins.
# Reduced chi-squared =          1.702 for     57 degrees of freedom 
# Null hypothesis probability =   7.563194e-04
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.343e-07   5.054e-09
25- 50  2.583e-07   9.648e-09
50-150  5.664e-07   2.200e-08
15-150  9.589e-07   3.554e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.72037        (-1.27642      1.43062)
R1^2/D10^2  : 1.46013        (-0.582589      1.1859)
kT2 [keV]   : 26.9065        (-2.76539      3.9857)
R2^2/D10^2  : 3.61081E-02    (-0.0145078   0.0181768)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.39 using 59 PHA bins.
# Reduced chi-squared =         0.7707 for     55 degrees of freedom 
# Null hypothesis probability =   8.932977e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.512e-08   1.564e-08
25- 50  2.457e-07   2.565e-08
50-150  6.849e-07   8.028e-08
15-150  1.026e-06   9.890e-08

Peak spectrum fit

Power-law model

Time interval is from   -0.116 sec. to    0.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.10246     ( -0.0638076   0.063535 )
Norm@50keV  : 5.62419E-02    ( -0.0021199   0.00211917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.27 using 59 PHA bins.
# Reduced chi-squared =          1.198 for     57 degrees of freedom 
# Null hypothesis probability =   1.458889e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.353026 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.87625e-07 ( -2.40782e-08  2.41194e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.116 sec. to    0.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.564481     ( -0.275325   0.259274 )
Epeak [keV] : 153.929      ( -33.3107 85.7706 )
Norm@50keV  : 9.76673E-02    ( -0.0222018   0.0305329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.91 using 59 PHA bins.
# Reduced chi-squared =         0.9805 for     56 degrees of freedom 
# Null hypothesis probability =   5.162968e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.39582 ( -0.25979  0.25997 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.76116e-07 ( -2.52068e-08  2.51408e-08 ) ergs/cm2

Band function

Time interval is from   -0.116 sec. to    0.884 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]    : 20.9495  (  )
R^2/D10^2   : 0.271543  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         148.90 using 59 PHA bins.
# Reduced chi-squared =         2.6123 for     57 degrees of freedom 
# Null hypothesis probability =   3.796648e-10
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.254e-08   1.650e-09
25- 50  1.157e-07   6.350e-09
50-150  3.783e-07   2.405e-08
15-150  5.165e-07   2.455e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 26.8562       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         196.09 using 59 PHA bins.
# Reduced chi-squared =         3.4402 for     57 degrees of freedom 
# Null hypothesis probability =   3.677096e-17
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.687e-08   2.585e-09
25- 50  1.286e-07   5.250e-09
50-150  2.821e-07   1.195e-08
15-150  4.776e-07   1.750e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.08928        (-1.30292      1.50664)
R1^2/D10^2  : 2.76199        (-1.09281      2.06421)
kT2 [keV]   : 30.2600        (-3.11942      4.41112)
R2^2/D10^2  : 7.04968E-02    (-0.0264404   0.0327117)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.77 using 59 PHA bins.
# Reduced chi-squared =         0.9231 for     55 degrees of freedom 
# Null hypothesis probability =   6.369212e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.299e-08   8.075e-09
25- 50  1.210e-07   1.404e-08
50-150  4.168e-07   4.795e-08
15-150  5.808e-07   6.290e-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: 1.30595     ( -0.0604793   0.0603959 )
Norm@50keV  : 2.22008E-02    ( -0.000754764   0.000754738 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.07 using 59 PHA bins.
# Reduced chi-squared =         0.9661 for     57 degrees of freedom 
# Null hypothesis probability =   5.479774e-01
 
Photon flux (15-150 keV)    in 4.836 sec: 2.65151 ( -0.0956968  0.0959291 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.05941e-06 ( -3.87297e-08  3.8805e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.749432     ( -0.271344   0.255999 )
Epeak [keV] : 126.124      ( -23.965 58.1178 )
Norm@50keV  : 3.95934E-02    ( -0.0090287   0.0124585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.42 using 59 PHA bins.
# Reduced chi-squared =         0.7217 for     56 degrees of freedom 
# Null hypothesis probability =   9.420539e-01
 
Photon flux (15-150 keV)    in 4.836 sec: 2.56923 ( -0.10185  0.10219 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02912e-06 ( -4.18266e-08  4.16815e-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)  = 2.36e-07
S(50-100 keV) = 3.83e-07

T90 vs. Hardness ratio plot

T90                                   = 3.81999999284744 sec.
Hardness ratio (energy fluence ratio) = 1.62288

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.63022
Count Ratio (50-100 keV) / (15-25 keV) = 1.49748

Mask shadow pattern

IMX = 4.867149743435846E-01, IMY = 8.365845143776025E-02

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:
-18.943400 -0.692000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5248 -40.5479    1.7  16.6  143.3   0.3124   6.8    0.4	Vela X-1                      
170.2076 -60.7824   31.7  35.0   85.4  -0.0381  -0.4   10.1	Cen X-3                       
109.9137 -58.6767    2.4  40.5  133.5   0.5604   4.7 ------	UNKNOWN

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

Time interval of the image:
-0.692000 4.144000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7032 -40.4002    0.0  16.4  143.4  -0.0334  -1.0   12.2	Vela X-1                      
170.4576 -60.7558    5.7  35.0   85.2   0.1582   2.0    9.0	Cen X-3                       
192.0862 -28.6945    2.3  37.0   23.4   0.2544   5.0 ------	UNKNOWN                       
154.4171 -41.7434    1.9  13.7   87.8   0.2157   6.1 ------	UNKNOWN                       
174.9477 -16.3112    0.3  26.3   -9.8   1.5683  44.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
67.656580 782.446000
840.356000 902.435600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5627 -40.5490    2.6  41.7 -171.4   4.2273   4.5    1.6	Vela X-1                      
170.0124 -60.5872    9.2  44.4  145.7   2.2362   1.2    9.2	Cen X-3                       
186.5633 -62.8276    2.0  47.2  135.0  14.6883   5.7    4.3	GX 301-2                      
203.0259 -17.0297    3.0  26.9   57.8   3.0261   3.8 ------	UNKNOWN                       
203.0472  17.1520    2.3  43.4    3.1   4.6253   5.0 ------	UNKNOWN                       
124.1928 -13.4526    2.7  49.0 -131.7  12.1631   4.3 ------	UNKNOWN

Plot creation:
Mon Sep 11 18:09:07 EDT 2017