batgrbproduct analysis for trigger=927825

batgrbproduct Analysis for Trigger=927825

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): Wed Nov 27 12:21:50 EST 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger927825
======================================================================

  Trigger: 00927825      Segment: 000

  BAT Trigger Time: 591905246.556   [s; MET]
      Trigger Stop: 591905246.62   [s; MET]
               UTC: 2019-10-04T18:07:02.863100    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 31.7210640523513   Dec: -36.9316566745842  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.12
     Image Trigger?:     NO
     Rate S/N Ratio:     32.832910318764  [ if not an image trigger ]
     Image S/N Ratio:    9.12

  Flight Position:   [ source = BAT ]
    RA: 31.7210640523513   Dec: -36.9316566745842  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 31.7139802104934   Dec: -36.9309718663815  [deg; J2000]  
        { 02h 06m 51.4s , -36d 55' 51.5" }
         +/- 1.07578999970331 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.34475150531572 [arcmin] (formal 1-sigma fit error)
    SNR: 27.4027012457388
 
  Angular difference between Flight and Ground position is 0.342226 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 2.44399988651276 +/- 0.0823651038377751
        Measured from: -0.0119999647140503
                   to: 2.43199992179871     [s; relative to TRIGTIME]
     T50: 1.77599990367889 +/- 0.0651152861923527
        Measured from: 0.220000028610229
                   to: 1.99599993228912     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0920000076293945     
                   to: 0.907999992370605     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0920000076293945     
                   to: 2.57599997520447     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.417915   0.642368   0.618592   0.148959
           0.026410   0.030320   0.028500   0.018947 [error]
 Peak      0.228848   0.328201   0.313187   0.062025
           0.017903   0.020629   0.019036   0.011697 [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 1.43e-07 2.88e-07 4.51e-07 1.57e-06 1.26e-06 2.45e-06   erg/cm2
              Error 1.30e-08 1.59e-08 2.67e-08 2.02e-07 6.70e-08 2.19e-07   erg/cm2
Peak flux Power-law 2.54e+00 2.58e+00 1.85e+00 2.12e+00 7.80e+00 9.09e+00   ph/cm2/s
              Error 2.80e-01 1.83e-01 1.46e-01 3.28e-01 5.25e-01 5.97e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.34e-07 2.96e-07 4.67e-07 1.06e-06 1.24e-06 1.96e-06   erg/cm2
              Error 1.59e-08 1.81e-08 3.15e-08 4.29e-07 6.95e-08 4.39e-07   erg/cm2
Peak flux Cutoff-PL 2.23e+00 2.75e+00 2.01e+00 1.15e+00 7.67e+00 8.13e+00   ph/cm2/s
              Error 3.37e-01 2.18e-01 1.81e-01 4.45e-01 5.32e-01 6.84e-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    1.350    0.084    -      -           4.83e-02 2.38e-03   56.430 57
CPL   1.048    0.332     174.1  -55.0      6.69e-02 2.37e-02   53.780 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.481    0.104    -      -           6.28e-02 4.14e-03   76.070 57
CPL   0.807    0.449      93.7   43.9      1.34e-01 6.97e-02   68.530 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: 2.432000 sec.
T50 in the 50-300 keV band: 1.792000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    2.668   -0.092    2.576
T90     2.444   -0.012    2.432
T50     1.776    0.220    1.996
Peak    1.000   -0.092    0.908

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
   31.7140   -36.9310   0.0070    35.9837   117.7876         1.9039448     27.403 TRIG_00927825                 
 
Foreground time interval of the image:
 -0.092   2.576 (delta_t =   2.668 [sec])
Background time interval of the image:
-239.556  -0.092 (delta_t = 239.464 [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   -0.092 sec. to    2.576 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.35044     ( -0.0838171   0.0838034 )
Norm@50keV  : 4.82799E-02    ( -0.00237783   0.0023776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.43 using 59 PHA bins.
# Reduced chi-squared =         0.9900 for     57 degrees of freedom 
# Null hypothesis probability =   4.963793e-01
 
Photon flux (15-150 keV)    in 2.668 sec: 5.81694 ( -0.30015  0.30056 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.2581e-06 ( -6.69249e-08  6.70821e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.092 sec. to    2.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.04767     ( -0.341034   0.322737 )
Epeak [keV] : 174.070      ( -64.1602 -174.07 )
Norm@50keV  : 6.68534E-02    ( -0.0188982   0.0284271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.78 using 59 PHA bins.
# Reduced chi-squared =         0.9604 for     56 degrees of freedom 
# Null hypothesis probability =   5.593723e-01
 
Photon flux (15-150 keV)    in 2.668 sec: 5.74688 ( -0.30874  0.30901 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.24307e-06 ( -6.95646e-08  6.93571e-08 ) ergs/cm2

Band function

Time interval is from   -0.092 sec. to    2.576 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]    : 18.2341  (  )
R^2/D10^2   : 0.353334  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         142.20 using 59 PHA bins.
# Reduced chi-squared =         2.4947 for     57 degrees of freedom 
# Null hypothesis probability =   3.133163e-09
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.249e-08   6.630e-09
25- 50  2.918e-07   1.828e-08
50-150  7.065e-07   5.323e-08
15-150  1.061e-06   6.216e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-10.9938      -200)
Norm        : 24.3140       (-1.20575     1.20575)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.73 using 59 PHA bins.
# Reduced chi-squared =          1.276 for     57 degrees of freedom 
# Null hypothesis probability =   7.817329e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.615e-07   9.298e-09
25- 50  3.107e-07   1.641e-08
50-150  6.814e-07   4.389e-08
15-150  1.154e-06   7.057e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.91650        (-1.15538      1.39629)
R1^2/D10^2  : 5.40871        (-2.46487      4.98896)
kT2 [keV]   : 27.4539        (-3.28029      4.83001)
R2^2/D10^2  : 7.39073E-02    (-0.0323796   0.0433112)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.73 using 59 PHA bins.
# Reduced chi-squared =         0.9588 for     55 degrees of freedom 
# Null hypothesis probability =   5.616844e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.340e-07   2.971e-08
25- 50  2.920e-07   3.930e-08
50-150  8.209e-07   1.178e-07
15-150  1.247e-06   1.583e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.092 sec. to    0.908 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48139     ( -0.103489   0.104241 )
Norm@50keV  : 6.28050E-02    ( -0.00414283   0.00413688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.07 using 59 PHA bins.
# Reduced chi-squared =          1.335 for     57 degrees of freedom 
# Null hypothesis probability =   4.651691e-02
 
Photon flux (15-150 keV)    in 1 sec: 7.80215 ( -0.52434  0.52482 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.97737e-07 ( -4.22678e-08  4.24104e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.092 sec. to    0.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.806976     ( -0.469556   0.428726 )
Epeak [keV] : 93.6656      ( -19.2499 68.5451 )
Norm@50keV  : 0.134295    ( -0.050397   0.089033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.53 using 59 PHA bins.
# Reduced chi-squared =          1.224 for     56 degrees of freedom 
# Null hypothesis probability =   1.214079e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.66691 ( -0.53231  0.53245 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.42492e-07 ( -4.90042e-08  4.23035e-08 ) ergs/cm2

Band function

Time interval is from   -0.092 sec. to    0.908 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]    : 16.5248  (-1.22928  1.31672)
R^2/D10^2   : 0.668141  (-0.158906   0.207793)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         111.77 using 59 PHA bins.
# Reduced chi-squared =         1.9609 for     57 degrees of freedom 
# Null hypothesis probability =   2.005987e-05
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.744e-08   4.570e-09
25- 50  1.619e-07   1.415e-08
50-150  3.126e-07   3.705e-08
15-150  5.119e-07   4.025e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-32.503      -200)
Norm        : 32.2766       (-2.10345     2.10345)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.75 using 59 PHA bins.
# Reduced chi-squared =          1.276 for     57 degrees of freedom 
# Null hypothesis probability =   7.800574e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.066e-08   5.975e-09
25- 50  1.552e-07   1.195e-08
50-150  3.403e-07   6.930e-08
15-150  5.761e-07   7.755e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.23599        (-1.29884      1.62354)
R1^2/D10^2  : 10.1825        (-5.51584      14.0578)
kT2 [keV]   : 22.7071        (-2.75292      4.04384)
R2^2/D10^2  : 0.180619    (-0.0858226   0.118741)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.63 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     55 degrees of freedom 
# Null hypothesis probability =   1.544801e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.248e-08   2.552e-08
25- 50  1.516e-07   3.349e-08
50-150  3.588e-07   8.005e-08
15-150  5.829e-07   1.253e-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: 1.35044     ( -0.0838171   0.0838034 )
Norm@50keV  : 4.82799E-02    ( -0.00237783   0.0023776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.43 using 59 PHA bins.
# Reduced chi-squared =         0.9900 for     57 degrees of freedom 
# Null hypothesis probability =   4.963793e-01
 
Photon flux (15-150 keV)    in 2.668 sec: 5.81686 ( -0.300137  0.300545 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25794e-06 ( -6.69489e-08  6.70815e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.04767     ( -0.341034   0.322737 )
Epeak [keV] : 174.070      ( -64.1602 -174.07 )
Norm@50keV  : 6.68534E-02    ( -0.0188982   0.0284271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.78 using 59 PHA bins.
# Reduced chi-squared =         0.9604 for     56 degrees of freedom 
# Null hypothesis probability =   5.593723e-01
 
Photon flux (15-150 keV)    in 2.668 sec: 5.74635 ( -0.30866  0.30892 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.24358e-06 ( -6.96401e-08  6.93893e-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)  = 2.88e-07
S(50-100 keV) = 4.51e-07

T90 vs. Hardness ratio plot

T90                                   = 2.44399988651276 sec.
Hardness ratio (energy fluence ratio) = 1.56597

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.53708
Count Ratio (50-100 keV) / (15-25 keV) = 1.48019

Mask shadow pattern

IMX = -3.385085496979163E-01, IMY = -6.423743622980559E-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:
-239.556000 -0.092000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.8752 -44.4782    5.7  54.1  -28.6  -1.9628  -2.0    5.9	4U 1735-44                    
 17.3306 -45.6105    2.9  26.4   98.3   1.2916   4.1 ------	UNKNOWN                       
 69.1284 -50.4019    2.7  31.7  172.3   1.1838   4.3 ------	UNKNOWN

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

Time interval of the image:
-0.092000 2.576000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.8434 -44.3077    7.2  54.2  -28.5   0.1448   1.6    9.6	4U 1735-44                    
 35.7561 -32.2457    2.0  41.1  121.9   0.6299   5.9 ------	UNKNOWN                       
 16.2014 -36.8165    2.5  35.2   96.4   0.3311   4.6 ------	UNKNOWN                       
 31.7140 -36.9310    0.4  36.0  117.8   1.9040  27.4 ------	UNKNOWN                       
 79.2593 -73.6460    2.6  17.9 -138.9   0.1146   4.5 ------	UNKNOWN                       
132.1851 -51.8128    2.9  48.5 -131.7   0.3750   4.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
65.344590 709.880400
720.444000 899.578300
900.444000 962.535600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 65.8926  -7.2718    3.3  43.0  175.5   4.1685   3.5 ------	UNKNOWN                       
323.3813 -48.6514    2.8  49.7   -5.8   4.8478   4.1 ------	UNKNOWN                       
300.5980 -60.6031    3.6  58.9  -24.4  12.9336   3.3 ------	UNKNOWN                       
 54.6279 -72.1677    3.4  37.1  -70.8   4.8017   3.4 ------	UNKNOWN

Plot creation:
Wed Nov 27 16:30:20 EST 2019