batgrbproduct analysis for trigger=1006917

batgrbproduct Analysis for Trigger=1006917

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): Wed Nov 18 05:10:02 EST 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger1006917/GCN5_download_cron
======================================================================

  Trigger: 01006917      Segment: 000

  BAT Trigger Time: 627264781.824   [s; MET]
      Trigger Stop: 627264782.336   [s; MET]
               UTC: 2020-11-17T00:12:35.829360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 85.8264456752716   Dec: 25.5968360195763  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.99
     Image Trigger?:     NO
     Rate S/N Ratio:     16.4012194668567  [ if not an image trigger ]
     Image S/N Ratio:    7.99

  Flight Position:   [ source = BAT ]
    RA: 85.8264456752716   Dec: 25.5968360195763  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 85.8427758134653   Dec: 25.4976907154175  [deg; J2000]  
        { 05h 43m 22.3s , +25d 29' 51.7" }
         +/- 3.09369952260836 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.52859646996263 [arcmin] (formal 1-sigma fit error)
    SNR: 6.05947972543393
 
  Angular difference between Flight and Ground position is 6.014044 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 575.807999968529 +/- 7.60372221125665
        Measured from: 109.796000123024
                   to: 685.604000091553     [s; relative to TRIGTIME]
     T50: 310.575999975204 +/- 2.46301932958064
        Measured from: 282.964000105858
                   to: 593.540000081062     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 585.815999984741     
                   to: 586.815999984741     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -7.81599998474121     
                   to: 705.65600001812     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total   126.580213  98.682206  14.045975   0.407009
           0.247990   0.238403   0.174364   0.166826 [error]
 Peak      0.293316   0.257661   0.048387   0.007238
           0.010624   0.010335   0.006643   0.005956 [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 6.38e-05 3.36e-05 1.10e-05 4.67e-06 1.11e-04 1.13e-04   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Power-law 3.26e+00 1.60e+00 4.78e-01 1.81e-01 5.44e+00 5.51e+00   ph/cm2/s
              Error 2.30e-01 8.93e-02 4.91e-02 3.33e-02 3.01e-01 3.02e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.88e-05 4.02e-05 1.00e-05 3.33e-07 8.93e-05 8.93e-05   erg/cm2
              Error 2.07e-06 7.48e-07 2.82e-07 5.52e-08 2.46e-06 2.46e-06   erg/cm2
Peak flux Cutoff-PL 2.74e+00 2.01e+00 3.11e-01 5.46e-03 5.07e+00 5.07e+00   ph/cm2/s
              Error 2.65e-01 1.30e-01 6.83e-02 5.81e-03 3.09e-01 3.10e-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    3.609    0.000    -      -           9.27e-03 0.00e+00  941.690 57
CPL   0.419    0.231      20.9    1.6      5.22e-01 1.51e-01   39.710 56
 
The chi2 of BB fit is 229.21 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    2.739    0.105    -      -           2.37e-02 1.89e-03  107.030 57
CPL  -0.149    0.810      25.9    2.8      1.62e+00 2.97e+00   42.760 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: 584.128000 sec.
T50 in the 50-300 keV band: 301.696000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  713.472   -7.816  705.656
T90   575.808  109.796  685.604
T50   310.576  282.964  593.540
Peak    1.000  585.816  586.816

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
   85.8428 +25.4977 0.0317    0.3 -159.1       0.6735     6.1  TRIG_01006917       
------------------------------------------
 
Foreground time interval of the image:
 -7.816  15.177 (delta_t =  22.993 [sec])
Background time interval of the image:
-29.824  -7.816 (delta_t =  22.008 [sec])

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
-7.816000 36.926000
38.176000 562.476000
563.176000 705.656000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.60852     (     )
Norm@50keV  : 9.26565E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  941.69     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.93e-160 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 711.5 sec: 4.09593 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0.000111037 ( 0  0 ) ergs/cm2

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
-7.816000 36.926000
38.176000 562.476000
563.176000 705.656000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.419396     ( -0.234655   0.226714 )
Epeak [keV] : 20.9453      ( -1.68062 1.5175 )
Norm@50keV  : 0.522186    ( -0.127103   0.174613 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   39.71     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.51e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 711.5 sec: 2.97520 ( -0.10759  0.10925 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.93032e-05 ( -2.44329e-06  2.46962e-06 ) ergs/cm2

Band function

Multiple GTIs in the spectrum
tstart tstop
-7.816000 36.926000
38.176000 562.476000
563.176000 705.656000
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.419514   ( -0.212718   0.250268 )
beta        : -10.0000    ( 10   10 )
Epeak [keV] : 20.9372      ( -1.67126 1.52408 )
Norm@50keV   : 0.522378    ( -0.126625   0.175917 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 711.5 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]    : 7.62404  (  )
R^2/D10^2   : 3.52921  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  229.21     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.64e-22 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.541e-05   8.076e-07
25- 50  4.083e-05   7.435e-07
50-150  9.127e-06   2.490e-07
15-150  7.536e-05   1.459e-06

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 19.1657       (-0.342167      0.351897)
Norm        : 43.6365       (-1.80616     1.87334)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   93.67     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.59e-03 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.640e-05   1.380e-06
25- 50  3.930e-05   7.151e-07
50-150  1.095e-05   3.237e-07
15-150  9.665e-05   1.957e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.92091        (-0.405233      0.416004)
R1^2/D10^2  : 16.7074        (-4.41026      7.00985)
kT2 [keV]   : 9.25491        (-0.386541      0.499686)
R2^2/D10^2  : 0.872423    (-0.28886   0.328168)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   33.01     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.92e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.761e-05   3.369e-06
25- 50  4.031e-05   2.199e-06
50-150  1.031e-05   7.435e-07
15-150  8.823e-05   5.194e-06

Peak spectrum fit

Power-law model

Time interval is from  585.816 sec. to  586.816 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.73874     ( -0.103582   0.107137 )
Norm@50keV  : 2.37384E-02    ( -0.00188706   0.00188389 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  107.03     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.78e-05 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.43666 ( -0.301313  0.301628 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.56055e-07 ( -1.47102e-08  1.47809e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  585.816 sec. to  586.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.149240     ( -0.868982   0.751522 )
Epeak [keV] : 25.9028      ( -3.23857 2.30971 )
Norm@50keV  : 1.61779    ( -1.61795   4.3199 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   42.76     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.03e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.07241 ( -0.30907  0.30991 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.25375e-07 ( -1.3681e-08  1.3959e-08 ) ergs/cm2

Band function

Time interval is from  585.816 sec. to  586.816 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.146360   ( -0.707543   3.08769 )
beta        : -10.0000    ( 10   10 )
Epeak [keV] : 25.8915      ( -3.23118 2.31704 )
Norm@50keV   : 1.61101    ( -1.61101   4.33766 )
------------------------------------------------------------
 
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]    : 7.24866  (-0.343385  0.357298)
R^2/D10^2   : 8.89184  (-1.72246   2.14731)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.03     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.97e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.771e-08   6.030e-09
25- 50  1.138e-07   6.950e-09
50-150  2.136e-08   3.570e-09
15-150  2.128e-07   1.260e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 26.3052       (-2.43506      2.74922)
Norm        : 49.5906       (-5.47547     6.19101)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.21     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.42e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.377e-08   6.650e-09
25- 50  9.924e-08   5.715e-09
50-150  4.542e-08   7.400e-09
15-150  2.384e-07   1.400e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.79159        (-1.4037      0.97617)
R1^2/D10^2  : 16.5095        (-5.54883      15.8715)
kT2 [keV]   : 11.1181        (-6.97059      6.24338)
R2^2/D10^2  : 0.579421    (-0.461937   2.97536)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.81     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.23e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.481e-08   2.828e-08
25- 50  1.074e-07   4.415e-08
50-150  3.535e-08   1.902e-08
15-150  2.275e-07   8.594e-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: 3.21668     (     )
Norm@50keV  : 9.44913E-03    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  172.07     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.75e-13 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 22.99 sec: 3.05556 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.90623e-06 ( 0  0 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.233883     ( -0.580525   0.533823 )
Epeak [keV] : 20.1788      ( -3.0692 2.33091 )
Norm@50keV  : 0.716173    ( -0.38652   0.954607 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   31.59     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.97e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 22.99 sec: 2.60778 ( -0.12611  0.12724 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.4531e-06 ( -9.97306e-08  1.00788e-07 ) ergs/cm2

Band function

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.233691   ( -0.467467   0.768589 )
beta        : -10.0000    ( 10   10 )
Epeak [keV] : 20.1738      ( -2.84075 2.33082 )
Norm@50keV   : 0.716624    ( -0.386836   0.957215 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 22.99 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)  = 3.36e-05
S(50-100 keV) = 1.10e-05

T90 vs. Hardness ratio plot

T90                                   = 575.807999968529 sec.
Hardness ratio (energy fluence ratio) = 0.327381

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.779602
Count Ratio (50-100 keV) / (15-25 keV) = 0.110965

Mask shadow pattern

IMX = -4.729703601730605E-03, IMY = 1.802965413192347E-03

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:
-29.824000 -7.816000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5541  21.9216    3.5   3.9   36.9  -0.3753  -3.3    7.1	Crab                          
 45.1337  44.0151    2.3  37.8  135.2   1.3026   5.0 ------	UNKNOWN                       
 57.5135  18.1418    2.7  27.1   85.5   0.6937   4.3 ------	UNKNOWN                       
 84.8719  21.1833    2.1   4.1   16.5   0.6147   5.4 ------	UNKNOWN                       
 85.8659  25.5622    0.2   0.4 -158.8   6.2495  52.3 ------	UNKNOWN                       
 94.4039  71.0128    2.8  46.1 -171.1   0.9842   4.1 ------	UNKNOWN                       
140.8677  52.1240    2.5  49.2 -133.3   2.4712   4.6 ------	UNKNOWN

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

Time interval of the image:
-7.816000 15.176600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7295  21.8812    3.5   3.8   34.5   0.3771   3.3    9.6	Crab                          
 80.6562   1.5462    1.9  24.2   17.5   0.7701   6.2 ------	UNKNOWN                       
 84.0164   7.7556    2.4  17.5   10.7   0.5473   4.9 ------	UNKNOWN                       
 85.8428  25.4977    1.9   0.3 -159.1   0.6738   6.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
22.876600 36.926000
38.176000 562.476000
563.176000 962.198600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4934  22.1508    4.7   4.0   37.8  -6.4930  -2.5   11.3	Crab                          
 47.5312  25.0065    2.5  34.5  103.0  23.1448   4.5 ------	UNKNOWN                       
 45.9824  40.6319    2.2  36.2  130.1  26.4400   5.2 ------	UNKNOWN                       
 84.8212  21.2348    1.3   4.5   17.7  22.9621   8.8 ------	UNKNOWN                       
 85.8588  25.5731    0.1   0.0  -55.3 247.6662 103.4 ------	UNKNOWN                       
144.0113  67.7979    2.3  54.6 -151.3  53.1744   5.1 ------	UNKNOWN

Plot creation:
Wed Nov 18 05:14:26 EST 2020