batgrbproduct analysis for trigger=1006906

batgrbproduct Analysis for Trigger=1006906

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
4) This page will be updated for up to 15 downlinks after the trigger.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time (local time): Tue Nov 17 19:21:30 EST 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger1006906/GCN5_download_cron
======================================================================

  Trigger: 01006906      Segment: 000

  BAT Trigger Time: 627260384   [s; MET]
      Trigger Stop: 627260448   [s; MET]
               UTC: 2020-11-16T22:59:18.005640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 85.7763755837787   Dec: 25.2325644711137  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    22.14
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    22.14

  Flight Position:   [ source = BAT ]
    RA: 85.7763755837787   Dec: 25.2325644711137  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 85.7836247158736   Dec: 25.2357365744443  [deg; J2000]  
        { 05h 43m 08.1s , +25d 14' 08.7" }
         +/- 1.02060682394206 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.50455801717323 [arcmin] (formal 1-sigma fit error)
    SNR: 29.5436007752647
 
  Angular difference between Flight and Ground position is 0.437059 arcmin
 
  Partial Coding Fraction: 0.15625    [ including projection effects ]

  Duration
     T90: 358.479999899864 +/- 13.1066401062306
        Measured from: -110.483999848366
                   to: 247.996000051498     [s; relative to TRIGTIME]
     T50: 218.015999913216 +/- 4.44977886235212
        Measured from: -55.8439998626709
                   to: 162.172000050545     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 227.12399995327     
                   to: 228.12399995327     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -122.907999992371     
                   to: 294.172000050545     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    72.275265  57.536671   8.225210   0.558158
           0.297101   0.290262   0.215473   0.206264 [error]
 Peak      0.347886   0.317899   0.049352   0.001111
           0.010991   0.010783   0.006756   0.005867 [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 3.94e-05 2.22e-05 7.87e-06 3.66e-06 7.14e-05 7.31e-05   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Power-law 4.73e+00 2.13e+00 5.76e-01 1.94e-01 7.55e+00 7.63e+00   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 2.57e-05 2.61e-05 6.06e-06 1.76e-07 5.80e-05 5.80e-05   erg/cm2
              Error 1.52e-06 5.40e-07 2.91e-07 4.61e-08 1.78e-06 1.78e-06   erg/cm2
Peak flux Cutoff-PL 3.72e+00 2.70e+00 3.94e-01 5.95e-03 6.82e+00 6.82e+00   ph/cm2/s
              Error 3.70e-01 1.54e-01 7.07e-02 5.26e-03 4.08e-01 4.08e-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    3.496    0.000    -      -           1.09e-02 0.00e+00  531.740 57
CPL   0.373    0.306      20.7    1.9      6.60e-01 2.72e-01   44.180 56
 
The chi2 of BB fit is 148.05 which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.885    0.000    -      -           2.98e-02 0.00e+00  120.920 57
CPL  -0.236    0.749      25.7    2.7      2.58e+00 3.58e+00   36.360 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: 65.024000 sec.
T50 in the 50-300 keV band: 35.392000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  417.080 -122.908  294.172
T90   358.480 -110.484  247.996
T50   218.016  -55.844  162.172
Peak    1.000  227.124  228.124

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minutes to calcaulte

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   85.7836 +25.2357 0.0065   36.8   86.5      27.0590    29.5  TRIG_01006906       
------------------------------------------
 
Foreground time interval of the image:
-18.799  69.701 (delta_t =  88.500 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) All plots contain as much data as has been downloaded to date.
2) The mask-weighted light curves are using the flight position.
3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
4) 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.
5) 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.
6) 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)

Spectra

Notes:

1) The fitting includes the systematic errors.
2) For long bursts, a spectral fit of 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.
4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.

Time averaged spectrum fit using the pre-slew DRM

Power-law model

Multiple GTIs in the spectrum
tstart tstop
-122.908000 209.820000
211.000000 294.172000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.49604     (     )
Norm@50keV  : 1.09442E-02    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  531.74     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.16e-78 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 415.9 sec: 4.41228 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.14495e-05 ( 0  0 ) ergs/cm2

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
-122.908000 209.820000
211.000000 294.172000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.373403     ( -0.313013   0.299835 )
Epeak [keV] : 20.6521      ( -2.05766 1.78054 )
Norm@50keV  : 0.660221    ( -0.212805   0.331342 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.18     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.73e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 415.9 sec: 3.33782 ( -0.13298  0.13527 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.80002e-05 ( -1.76508e-06  1.78587e-06 ) ergs/cm2

Band function

Multiple GTIs in the spectrum
tstart tstop
-122.908000 209.820000
211.000000 294.172000
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.69201   (     )
beta        : -8.53835    (     )
Epeak [keV] : 6.95840      (   )
Norm@50keV   : 0.113516    (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 415.9 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]    : 7.23905  (  )
R^2/D10^2   : 5.09027  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  148.05     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.97e-10 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.843e-05   6.738e-07
25- 50  2.691e-05   5.240e-07
50-150  5.028e-06   2.163e-07
15-150  5.037e-05   1.144e-06

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 19.0127       (-0.46112      0.478072)
Norm        : 48.7430       (-2.45322     2.57653)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.78     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.51e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.008e-05   9.919e-07
25- 50  2.531e-05   5.095e-07
50-150  6.954e-06   2.807e-07
15-150  6.235e-05   1.352e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.72745        (-0.555192      0.57711)
R1^2/D10^2  : 21.3869        (-7.10926      13.7861)
kT2 [keV]   : 8.85189        (-0.513172      0.760294)
R2^2/D10^2  : 1.25242    (-0.579035   0.661082)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   42.34     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.94e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.507e-05   2.805e-06
25- 50  2.606e-05   2.107e-06
50-150  6.212e-06   7.050e-07
15-150  5.734e-05   5.469e-06

Peak spectrum fit

Power-law model

Time interval is from  227.124 sec. to  228.124 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.88550     (     )
Norm@50keV  : 2.97979E-02    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  120.92     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.69e-06 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 7.54991 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.40439e-07 ( 0  0 ) ergs/cm2

Cutoff power-law model

Time interval is from  227.124 sec. to  228.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.236386     ( -0.791857   0.706238 )
Epeak [keV] : 25.7085      ( -3.0795 2.27551 )
Norm@50keV  : 2.57747    ( -1.64199   5.52794 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   36.36     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.81e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 6.82106 ( -0.40705  0.40923 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.00671e-07 ( -1.6377e-08  1.6595e-08 ) ergs/cm2

Band function

Time interval is from  227.124 sec. to  228.124 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.287733   ( -0.715983   0.901402 )
beta        : -6.49474    ( 6.50099   2.19998 )
Epeak [keV] : 25.7996      ( -3.11149 2.20634 )
Norm@50keV   : 2.78964    ( -1.4999   7.6471 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 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]    : 7.31138  (-0.306273  0.315383)
R^2/D10^2   : 11.4356  (-2.00568   2.45836)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.93     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.76e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.025e-07   7.605e-09
25- 50  1.525e-07   7.850e-09
50-150  2.951e-08   4.725e-09
15-150  2.845e-07   1.400e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 24.4098       (-1.92756      2.12934)
Norm        : 73.0072       (-7.52969     8.44227)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.38     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.49e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.316e-07   8.650e-09
25- 50  1.328e-07   6.850e-09
50-150  5.453e-08   8.830e-09
15-150  3.190e-07   1.625e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.73274        (-1.74677      7.42377)
R1^2/D10^2  : 66.5088        (-51.2831      2165.35)
kT2 [keV]   : 8.14190        (-0.713842      3.00501)
R2^2/D10^2  : 6.08508    (-5.49776   4.15945)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   35.99     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.78e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.167e-07   5.064e-08
25- 50  1.459e-07   4.714e-08
50-150  3.717e-08   1.289e-08
15-150  2.998e-07   9.235e-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: 3.06979     (     )
Norm@50keV  : 1.13963E-02    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  207.86     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.98e-19 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 88.5 sec: 3.29884 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25236e-05 ( 0  0 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.121765     ( -0.565447   0.520713 )
Epeak [keV] : 22.5947      ( -2.82091 2.16744 )
Norm@50keV  : 0.749625    ( -0.392543   0.937387 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.25     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.26e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 88.5 sec: 2.82150 ( -0.13647  0.13791 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.06104e-05 ( -4.34447e-07  4.39934e-07 ) ergs/cm2

Band function

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.50093   (     )
beta        : -9.06137    (     )
Epeak [keV] : 14.8195      (   )
Norm@50keV   : 7.25368E-02    (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 88.5 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)  = 2.22e-05
S(50-100 keV) = 7.87e-06

T90 vs. Hardness ratio plot

T90                                   = 358.479999899864 sec.
Hardness ratio (energy fluence ratio) = 0.354505

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.796077
Count Ratio (50-100 keV) / (15-25 keV) = 0.113804

Mask shadow pattern

IMX = 4.508308154667406E-02, IMY = -7.466551194411509E-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:

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

Time interval of the image:
-18.799400 69.700590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7274  21.8868    5.6  38.8   81.2  -2.7651  -2.1    9.3	Crab                          
 85.7836  25.2357    0.4  36.8   86.5  27.0599  29.5 ------	UNKNOWN                       
132.2267  72.7912    2.5  53.5  162.7   5.4062   4.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
128.700590 209.820000
211.000000 303.054400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4792  21.9397    5.4   3.9   38.3  -1.3616  -2.1    9.7	Crab                          
 47.5159  25.0229    2.5  34.5  103.0   6.0104   4.7 ------	UNKNOWN                       
 46.2186  40.6813    2.4  36.2  130.1   6.2153   4.9 ------	UNKNOWN                       
 84.7084  20.9057    1.1   4.4   18.2   6.6593  10.6 ------	UNKNOWN                       
 85.7555  25.2391    0.1   0.0  116.2  62.5018 104.5 ------	UNKNOWN                       
113.9382  15.0451    2.2  28.2  -69.4   4.4746   5.3 ------	UNKNOWN                       
111.9043  -7.3551    2.7  41.3  -36.4   4.7198   4.3 ------	UNKNOWN                       
123.5930  53.2395    2.4  39.7 -140.0   4.8462   4.8 ------	UNKNOWN                       
115.9002 -11.3951    2.8  46.9  -37.4   6.0522   4.1 ------	UNKNOWN                       
137.0798  42.3244    2.7  45.1 -120.6  11.4936   4.4 ------	UNKNOWN

Plot creation:
Tue Nov 17 19:24:06 EST 2020