batgrbproduct analysis for trigger=768939

batgrbproduct Analysis for Trigger=768939

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 18:50:37 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger768939
======================================================================

  Trigger: 00768939      Segment: 000

  BAT Trigger Time: 525085930.624   [s; MET]
      Trigger Stop: 525085934.72   [s; MET]
               UTC: 2017-08-22T09:11:51.057700    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 94.3820902752538   Dec: 55.0186424017826  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.48
     Image Trigger?:     NO
     Rate S/N Ratio:     28.6705423736629  [ if not an image trigger ]
     Image S/N Ratio:    15.48

  Flight Position:   [ source = BAT ]
    RA: 94.3820902752538   Dec: 55.0186424017826  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 94.3747958377121   Dec: 54.9991722260662  [deg; J2000]  
        { 06h 17m 30.0s , +54d 59' 57.0" }
         +/- 2.07411960337215 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.71692905057524 [arcmin] (formal 1-sigma fit error)
    SNR: 10.7275036534455
 
  Angular difference between Flight and Ground position is 1.194867 arcmin
 
  Partial Coding Fraction: 0.1210938    [ including projection effects ]

  Duration
     T90: 64 +/- 16
        Measured from: -15.6240000128746
                   to: 48.3759999871254     [s; relative to TRIGTIME]
     T50: 32 +/- 16
        Measured from: 0.375999987125397
                   to: 32.3759999871254     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 7.8759999871254     
                   to: 8.8759999871254     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.6240000128746     
                   to: 64.3759999871254     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.159279   4.047646   2.558933   0.385429
           0.172474   0.182155   0.154332   0.124743 [error]
 Peak      0.131422   0.189459   0.142840  -0.010452
           0.024036   0.025487   0.022650   0.014917 [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 1.18e-06 1.81e-06 2.07e-06 4.55e-06 6.41e-06 9.60e-06   erg/cm2
              Error 1.03e-07 9.79e-08 1.54e-07 7.04e-07 3.68e-07 8.37e-07   erg/cm2
Peak flux Power-law 1.59e+00 1.42e+00 8.70e-01 8.08e-01 4.23e+00 4.69e+00   ph/cm2/s
              Error 3.74e-01 2.21e-01 1.78e-01 3.17e-01 6.53e-01 7.17e-01   ph/cm2/s
 
Fluence   Cutoff-PL -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Cutoff-PL 1.41e+00 1.55e+00 9.34e-01 3.72e-01 4.14e+00 4.26e+00   ph/cm2/s
              Error 4.35e-01 2.77e-01 2.08e-01 4.02e-01 6.63e-01 7.62e-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    1.802    0.094    -      -           8.70e-03 4.89e-04   64.290 57
CPL   1.328    0.376      68.9   37.0      1.53e-02 7.01e-03   59.050 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.707    0.249    -      -           3.17e-02 5.17e-03   47.590 57
CPL   0.906    1.040      66.8  -24.7      8.30e-02 1.64e-01   45.470 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: 58.496000 sec.
T50 in the 50-300 keV band: 40.448000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   80.000  -15.624   64.376
T90    64.000  -15.624   48.376
T50    32.000    0.376   32.376
Peak    1.000    7.876    8.876

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
   94.3748    54.9992   0.0180    41.8299   -61.5808        11.2824570     10.728 TRIG_00768939                 
 
Foreground time interval of the image:
-15.624  64.376 (delta_t =  80.000 [sec])
Background time interval of the image:
-239.624 -15.624 (delta_t = 224.000 [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 4.096000

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 4.096000

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 4.096000

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  -15.624 sec. to   64.376 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.80167     ( -0.0932117   0.0944541 )
Norm@50keV  : 8.70290E-03    ( -0.000490364   0.00048775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.29 using 59 PHA bins.
# Reduced chi-squared =          1.128 for     57 degrees of freedom 
# Null hypothesis probability =   2.364580e-01
 
Photon flux (15-150 keV)    in 80 sec: 1.20008 ( -0.06653  0.06667 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.41018e-06 ( -3.66795e-07  3.68424e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -15.624 sec. to   64.376 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.32792     ( -0.39216   0.359271 )
Epeak [keV] : 68.9261      ( -13.494 60.5394 )
Norm@50keV  : 1.52840E-02    ( -0.00519353   0.00882503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.05 using 59 PHA bins.
# Reduced chi-squared =          1.055 for     56 degrees of freedom 
# Null hypothesis probability =   3.645945e-01
 
Photon flux (15-150 keV)    in 80 sec: 1.17222 ( -0.0696  0.06969 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Band function

Time interval is from  -15.624 sec. to   64.376 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]    : 12.7926  (  )
R^2/D10^2   : 0.223617  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         141.61 using 59 PHA bins.
# Reduced chi-squared =         2.4844 for     57 degrees of freedom 
# Null hypothesis probability =   3.762013e-09
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.210e-07   6.272e-08
25- 50  2.102e-06   1.424e-07
50-150  2.154e-06   2.572e-07
15-150  4.876e-06   2.956e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 109.828       (-20.9934      25.2691)
Norm        : 5.13463       (-0.366703     0.455125)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.12 using 59 PHA bins.
# Reduced chi-squared =          1.037 for     57 degrees of freedom 
# Null hypothesis probability =   3.982026e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.073e-06   9.800e-08
25- 50  1.889e-06   1.256e-07
50-150  3.222e-06   8.920e-07
15-150  6.184e-06   1.010e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.54433        (-0.956091      1.04022)
R1^2/D10^2  : 1.80546        (-0.729465      1.41508)
kT2 [keV]   : 22.7831        (-3.23021      4.61066)
R2^2/D10^2  : 1.95533E-02    (-0.00999836   0.0165743)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.72 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     55 degrees of freedom 
# Null hypothesis probability =   4.476061e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.069e-06   2.192e-07
25- 50  1.902e-06   2.732e-07
50-150  3.236e-06   8.280e-07
15-150  6.207e-06   1.167e-06

Peak spectrum fit

Power-law model

Time interval is from    7.876 sec. to    8.876 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.70731     ( -0.243935   0.254703 )
Norm@50keV  : 3.17388E-02    ( -0.0052145   0.005135 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.59 using 59 PHA bins.
# Reduced chi-squared =         0.8350 for     57 degrees of freedom 
# Null hypothesis probability =   8.081899e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.22627 ( -0.65283  0.65365 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.93738e-07 ( -4.97267e-08  5.02474e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    7.876 sec. to    8.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.906174     ( -1.17864   0.901436 )
Epeak [keV] : 66.8422      ( -17.3541 -66.8429 )
Norm@50keV  : 8.29813E-02    ( -0.0829793   0.245991 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.47 using 59 PHA bins.
# Reduced chi-squared =         0.8120 for     56 degrees of freedom 
# Null hypothesis probability =   8.415292e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.14146 ( -0.66291  0.66263 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.83211e-07 ( -5.09641e-08  5.18239e-08 ) ergs/cm2

Band function

Time interval is from    7.876 sec. to    8.876 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]    : 13.7138  (-2.30539  2.70761)
R^2/D10^2   : 0.662666  (-0.321585   0.626403)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.10 using 59 PHA bins.
# Reduced chi-squared =         0.9491 for     57 degrees of freedom 
# Null hypothesis probability =   5.846740e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.637e-08   8.010e-09
25- 50  9.606e-08   2.133e-08
50-150  1.177e-07   3.922e-08
15-150  2.401e-07   5.490e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 130.714       (-54.9918      -128.914)
Norm        : 17.8572       (-3.09884     4.0446)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.91 using 59 PHA bins.
# Reduced chi-squared =         0.8054 for     57 degrees of freedom 
# Null hypothesis probability =   8.535459e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.632e-08   1.261e-08
25- 50  8.406e-08   4.251e-08
50-150  1.563e-07   1.000e-07
15-150  2.866e-07   1.468e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.91323        (-2.67996      3.69094)
R1^2/D10^2  : 7.91219        (-6.27649      84.0164)
kT2 [keV]   : 20.2887        (-5.48497      12.8703)
R2^2/D10^2  : 0.124142    (-0.10694   0.324857)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.86 using 59 PHA bins.
# Reduced chi-squared =         0.8156 for     55 degrees of freedom 
# Null hypothesis probability =   8.337459e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.578e-08   2.616e-08
25- 50  8.401e-08   4.371e-08
50-150  1.536e-07   8.890e-08
15-150  2.834e-07   1.495e-07

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: 1.80167     ( -0.0932117   0.0944541 )
Norm@50keV  : 8.70290E-03    ( -0.000490364   0.00048775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.29 using 59 PHA bins.
# Reduced chi-squared =          1.128 for     57 degrees of freedom 
# Null hypothesis probability =   2.364580e-01
 
Photon flux (15-150 keV)    in 80 sec: 1.20002 ( -0.0665283  0.0666603 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.40918e-06 ( -3.67006e-07  3.68394e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.32792     ( -0.39216   0.359271 )
Epeak [keV] : 68.9261      ( -13.494 60.5394 )
Norm@50keV  : 1.52840E-02    ( -0.00519353   0.00882503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.05 using 59 PHA bins.
# Reduced chi-squared =          1.055 for     56 degrees of freedom 
# Null hypothesis probability =   3.645945e-01
 
Photon flux (15-150 keV)    in 80 sec: 1.17202 ( -0.06957  0.06966 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.20553e-06 ( -3.99568e-07  3.99904e-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)  = 1.81e-06
S(50-100 keV) = 2.07e-06

T90 vs. Hardness ratio plot

T90                                   = 64 sec.
Hardness ratio (energy fluence ratio) = 1.14365

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.28119
Count Ratio (50-100 keV) / (15-25 keV) = 0.809974

Mask shadow pattern

IMX = 4.259670919239378E-01, IMY = 7.871797057479685E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

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:
-239.624000 -15.624000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5933  35.2630    6.4  48.6  146.0   3.7028   1.8    3.7	Cyg X-1                       
308.3514  40.8532   10.6  40.1  142.1  -1.2362  -1.1   12.5	Cyg X-3                       
326.1956  38.4170    6.0  34.8  120.9   1.9467   1.9    5.8	Cyg X-2                       
334.0251  29.0317    2.5  40.6  104.7   7.9046   4.7 ------	UNKNOWN                       
318.2968  48.4913    2.5  29.8  140.5   2.8978   4.5 ------	UNKNOWN                       
 45.4749  42.7097    2.4  30.9   -5.9   2.4565   4.9 ------	UNKNOWN                       
235.4263  52.4448    4.6  57.3 -154.2  11.5510   2.5 ------	UNKNOWN                       
202.0300  67.3176    2.6  48.0 -129.0  13.5289   4.4 ------	UNKNOWN

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

Time interval of the image:
-15.624000 64.376000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6393  35.1659   81.9  48.7  145.9  -0.1012  -0.1    3.2	Cyg X-1                       
308.0781  40.8796    3.1  40.2  142.4   1.5558   3.7    4.6	Cyg X-3                       
325.9943  38.3832    8.2  34.9  121.1   0.5371   1.4    9.1	Cyg X-2                       
 34.0973  48.2356    2.7  21.9    2.4   0.8531   4.3 ------	UNKNOWN                       
271.2260  58.8212    3.4  41.3 -172.2   1.0916   3.4 ------	UNKNOWN                       
 94.3753  54.9991    1.1  41.8  -61.6  11.2592  10.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
152.276600 962.453300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6250  22.0209    0.3  34.0   -2.9  31.5130  41.7    0.6	Crab                          
125.5562  78.6225    2.7  25.8  172.6   2.8759   4.3 ------	UNKNOWN                       
203.0186  62.2192    2.5  50.2 -165.9   8.1171   4.6 ------	UNKNOWN                       
101.3774  11.1158    3.7  44.3  -30.8   3.1638   3.1 ------	UNKNOWN                       
199.0849  50.6602    5.3  57.2 -154.1  11.9295   2.2 ------	UNKNOWN                       
196.2588  49.6828    3.1  56.7 -151.7  15.6562   3.7 ------	UNKNOWN                       
161.2056  40.3741    2.2  45.4 -121.1  13.9317   5.2 ------	UNKNOWN

Plot creation:
Tue Sep 12 16:54:34 EDT 2017