batgrbproduct analysis for trigger=775553

batgrbproduct Analysis for Trigger=775553

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 20 14:31:52 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger775553
======================================================================

  Trigger: 00775553      Segment: 000

  BAT Trigger Time: 528575160   [s; MET]
      Trigger Stop: 528575248   [s; MET]
               UTC: 2017-10-01T18:25:40.226640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 22.0881651678874   Dec: -11.8933202859369  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.92
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.92

  Flight Position:   [ source = BAT ]
    RA: 22.0881651678874   Dec: -11.8933202859369  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 22.0856134443431   Dec: -11.9254421918445  [deg; J2000]  
        { 01h 28m 20.5s , -11d 55' 31.6" }
         +/- 2.21229698656252 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.0381728184087 [arcmin] (formal 1-sigma fit error)
    SNR: 9.78328965089821
 
  Angular difference between Flight and Ground position is 1.933128 arcmin
 
  Partial Coding Fraction: 0.7265625    [ including projection effects ]

  Duration
     T90: 20.9159999489784 +/- 1.35107659821179
        Measured from: 12.783999979496
                   to: 33.6999999284744     [s; relative to TRIGTIME]
     T50: 14.8439999222755 +/- 2.28122767053415
        Measured from: 16.6800000071526
                   to: 31.5239999294281     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 31.4160000085831     
                   to: 32.4160000085831     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 12.027999997139     
                   to: 34.1959999799728     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.249561   0.292991   0.284680   0.098345
           0.032751   0.034290   0.030186   0.027001 [error]
 Peak      0.036464   0.041516   0.032255   0.002187
           0.007264   0.007875   0.006869   0.005892 [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 7.23e-08 1.37e-07 2.02e-07 6.36e-07 5.72e-07 1.05e-06   erg/cm2
              Error 1.40e-08 1.59e-08 3.02e-08 2.09e-07 7.28e-08 2.31e-07   erg/cm2
Peak flux Power-law 3.47e-01 3.18e-01 2.01e-01 1.95e-01 9.47e-01 1.06e+00   ph/cm2/s
              Error 1.00e-01 6.04e-02 5.68e-02 1.09e-01 1.79e-01 2.09e-01   ph/cm2/s
 
Fluence   Cutoff-PL 7.05e-08 1.39e-07 2.04e-07 5.10e-07 5.65e-07 9.24e-07   erg/cm2
              Error 1.54e-08 1.85e-08 3.09e-08 2.56e-07 7.93e-08 2.71e-07   erg/cm2
Peak flux Cutoff-PL 3.26e-01 3.36e-01 2.05e-01 1.06e-01 9.30e-01 9.73e-01   ph/cm2/s
              Error 1.14e-01 7.42e-02 6.21e-02 1.14e-01 1.84e-01 2.26e-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    1.444    0.202    -      -           2.69e-03 3.04e-04   69.420 57
CPL   1.303    0.000     253.9    0.0      3.16e-03 0.00e+00   69.330 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.660    0.342    -      -           7.23e-03 1.56e-03   54.570 57
CPL   1.169    1.315      77.6  -20.3      1.34e-02 4.41e-02   54.100 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: 24.832000 sec.
T50 in the 50-300 keV band: 16.384000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   22.168   12.028   34.196
T90    20.916   12.784   33.700
T50    14.844   16.680   31.524
Peak    1.000   31.416   32.416

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
   22.0856   -11.9254   0.0197    20.8363    53.0294         0.8679399      9.783 TRIG_00775553                 
 
Foreground time interval of the image:
 12.028  34.196 (delta_t =  22.168 [sec])
Background time interval of the image:
-13.099  12.028 (delta_t =  25.127 [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

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   12.028 sec. to   34.196 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.44356     ( -0.200632   0.20292 )
Norm@50keV  : 2.68908E-03    ( -0.000305544   0.000303363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.42 using 59 PHA bins.
# Reduced chi-squared =          1.218 for     57 degrees of freedom 
# Null hypothesis probability =   1.251110e-01
 
Photon flux (15-150 keV)    in 22.17 sec: 0.330873 ( -0.03696  0.03703 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.7125e-07 ( -7.23704e-08  7.32987e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   12.028 sec. to   34.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30323     (     )
Epeak [keV] : 253.945      (   )
Norm@50keV  : 3.15706E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.33 using 59 PHA bins.
# Reduced chi-squared =          1.238 for     56 degrees of freedom 
# Null hypothesis probability =   1.086373e-01
 
Photon flux (15-150 keV)    in 22.17 sec: 0.328567 ( -0.039362  0.038652 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.65062e-07 ( -8.07833e-08  7.78706e-08 ) ergs/cm2

Band function

Time interval is from   12.028 sec. to   34.196 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]    : 15.9237  (-2.0868  2.49459)
R^2/D10^2   : 3.06356E-02  (-0.0120897   0.0192148)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          85.45 using 59 PHA bins.
# Reduced chi-squared =          1.499 for     57 degrees of freedom 
# Null hypothesis probability =   8.696507e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.565e-08   7.815e-09
25- 50  1.494e-07   2.511e-08
50-150  2.643e-07   5.882e-08
15-150  4.493e-07   7.183e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-60.5077      -200)
Norm        : 1.35532       (-0.14901     0.14901)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.39 using 59 PHA bins.
# Reduced chi-squared =          1.235 for     57 degrees of freedom 
# Null hypothesis probability =   1.096415e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.483e-08   4.179e-08
25- 50  1.439e-07   7.731e-08
50-150  3.157e-07   1.727e-07
15-150  5.345e-07   2.914e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.90913        (-1.18255      1.96558)
R1^2/D10^2  : 14.6360        (-13.5889      129.096)
kT2 [keV]   : 18.9827        (-2.94315      4.16582)
R2^2/D10^2  : 1.56729E-02    (-0.00787164   0.0122874)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.89 using 59 PHA bins.
# Reduced chi-squared =          1.216 for     55 degrees of freedom 
# Null hypothesis probability =   1.305512e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.460e-08   3.287e-08
25- 50  1.249e-07   2.773e-08
50-150  3.133e-07   7.977e-08
15-150  5.128e-07   1.181e-07

Peak spectrum fit

Power-law model

Time interval is from   31.416 sec. to   32.416 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65999     ( -0.330967   0.353295 )
Norm@50keV  : 7.22888E-03    ( -0.00158985   0.00153741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.57 using 59 PHA bins.
# Reduced chi-squared =         0.9574 for     57 degrees of freedom 
# Null hypothesis probability =   5.667224e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.947083 ( -0.179113  0.179137 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.71754e-08 ( -1.5342e-08  1.58536e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   31.416 sec. to   32.416 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.16929     ( -1.51679   1.11304 )
Epeak [keV] : 77.6203      ( -37.0242 -77.6184 )
Norm@50keV  : 1.33710E-02    ( -0.0133713   0.0748494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.10 using 59 PHA bins.
# Reduced chi-squared =         0.9661 for     56 degrees of freedom 
# Null hypothesis probability =   5.471054e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.930393 ( -0.183583  0.183637 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.42407e-08 ( -1.63887e-08  1.72992e-08 ) ergs/cm2

Band function

Time interval is from   31.416 sec. to   32.416 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]    : 12.8708  (-3.05138  4.01087)
R^2/D10^2   : 0.180342  (-0.110875   0.294934)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.76 using 59 PHA bins.
# Reduced chi-squared =          1.066 for     57 degrees of freedom 
# Null hypothesis probability =   3.420622e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.337e-09   2.231e-09
25- 50  2.159e-08   7.300e-09
50-150  2.248e-08   9.896e-09
15-150  5.040e-08   1.649e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 145.049       (-78.6397      -142.391)
Norm        : 3.91503       (-0.792036     1.12816)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.15 using 59 PHA bins.
# Reduced chi-squared =         0.9500 for     57 degrees of freedom 
# Null hypothesis probability =   5.826240e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.008e-08   5.685e-09
25- 50  1.860e-08   1.048e-08
50-150  3.620e-08   2.227e-08
15-150  6.488e-08   3.802e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.22145        (-2.51514      3.42672)
R1^2/D10^2  : 2.87145        (-2.38003      53.4986)
kT2 [keV]   : 20.0481        (-6.17478      14.6669)
R2^2/D10^2  : 3.04956E-02    (-0.0263655   0.0529037)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.08 using 59 PHA bins.
# Reduced chi-squared =         0.9652 for     55 degrees of freedom 
# Null hypothesis probability =   5.481539e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.064e-08   6.135e-09
25- 50  1.779e-08   8.915e-09
50-150  3.540e-08   2.180e-08
15-150  6.383e-08   3.371e-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: 1.44356     ( -0.200632   0.20292 )
Norm@50keV  : 2.68908E-03    ( -0.000305544   0.000303363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.42 using 59 PHA bins.
# Reduced chi-squared =          1.218 for     57 degrees of freedom 
# Null hypothesis probability =   1.251110e-01
 
Photon flux (15-150 keV)    in 22.17 sec: 0.330866 ( -0.036958  0.0370281 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.71172e-07 ( -7.23602e-08  7.33078e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30175     ( -0.905867   1.23019 )
Epeak [keV] : 249.038      ( -254.282 -254.282 )
Norm@50keV  : 3.16088E-03    ( -0.00138249   0.00547149 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.34 using 59 PHA bins.
# Reduced chi-squared =          1.238 for     56 degrees of freedom 
# Null hypothesis probability =   1.086190e-01
 
Photon flux (15-150 keV)    in 22.17 sec: 0.328530 ( -0.039353  0.038499 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.65284e-07 ( -8.08185e-08  7.80362e-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)  = 1.37e-07
S(50-100 keV) = 2.02e-07

T90 vs. Hardness ratio plot

T90                                   = 20.9159999489784 sec.
Hardness ratio (energy fluence ratio) = 1.47445

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.17403
Count Ratio (50-100 keV) / (15-25 keV) = 1.14072

Mask shadow pattern

IMX = 2.288884879572669E-01, IMY = -3.040696127955854E-01

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:
-13.099400 12.028000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']

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

Time interval of the image:
12.028000 34.196000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 22.0856 -11.9254    1.2  20.8   53.0   0.8678   9.8 ------	UNKNOWN                       
351.9142  52.8389    2.2  56.9  176.6   2.5095   5.3 ------	UNKNOWN                       
 50.1920  40.4765    2.5  37.8 -133.0   0.5349   4.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
175.300590 963.090000
1503.000000 1503.200600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  2.1113  22.8774    2.3  39.9  103.9  10.8400   5.1 ------	UNKNOWN                       
 23.2210  15.4319    2.1  27.3  135.7   4.0826   5.6 ------	UNKNOWN                       
334.7687 -33.0711    3.5  48.0    9.2   3.4101   3.3 ------	UNKNOWN                       
326.9806 -44.0337    4.2  56.9   -2.0   6.9574   2.8 ------	UNKNOWN                       
339.2112 -44.8871    2.6  49.2   -7.2   4.9064   4.5 ------	UNKNOWN                       
 64.7543   5.1296    2.5  45.7 -156.1   4.6662   4.6 ------	UNKNOWN                       
 70.6902   4.2278    2.7  51.0 -152.2   6.4170   4.3 ------	UNKNOWN

Plot creation:
Fri Oct 20 14:57:46 EDT 2017