batgrbproduct analysis for trigger=1000926
batgrbproduct Analysis for Trigger=1000926
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 Oct 21 21:08:39 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1000926/GCN5_download_cron
======================================================================
Trigger: 01000926 Segment: 000
BAT Trigger Time: 624865672 [s; MET]
Trigger Stop: 624865736 [s; MET]
UTC: 2020-10-20T05:47:26.163700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.246012461438 Dec: 31.4249402594 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.2
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.2
Flight Position: [ source = BAT ]
RA: 261.246012461438 Dec: 31.4249402594 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.239264424483 Dec: 31.4281113963921 [deg; J2000]
{ 17h 24m 57.4s , +31d 25' 41.2" }
+/- 1.13667782485652 [arcmin] (estimated 90% radius based on SNR)
+/- 0.378815165909722 [arcmin] (formal 1-sigma fit error)
SNR: 25.3300704556366
Angular difference between Flight and Ground position is 0.394418 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 14.3639999628067 +/- 4.75024429939659
Measured from: 11.1800000667572
to: 25.5440000295639 [s; relative to TRIGTIME]
T50: 5.14399993419647 +/- 0.667892212469055
Measured from: 14.7040001153946
to: 19.8480000495911 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.1720000505447
to: 18.1720000505447 [s; relative to TRIGTIME]
Total Fluence
Measured from: 7.85599994659424
to: 30.1720000505447 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.789958 0.700754 0.326169 0.018622
0.043187 0.039891 0.032630 0.026837 [error]
Peak 0.083174 0.097212 0.057148 0.008122
0.009837 0.009720 0.007855 0.005777 [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 2.54e-07 2.95e-07 2.45e-07 3.44e-07 9.18e-07 1.14e-06 erg/cm2
Error 2.52e-08 2.00e-08 3.12e-08 8.66e-08 7.05e-08 1.22e-07 erg/cm2
Peak flux Power-law 9.09e-01 7.07e-01 3.69e-01 2.78e-01 2.11e+00 2.26e+00 ph/cm2/s
Error 1.47e-01 7.87e-02 6.29e-02 8.98e-02 2.37e-01 2.53e-01 ph/cm2/s
Fluence Cutoff-PL 2.51e-07 3.00e-07 2.43e-07 2.53e-07 9.03e-07 1.05e-06 erg/cm2
Error 2.77e-08 2.49e-08 3.37e-08 -------- 8.37e-08 1.96e-07 erg/cm2
Peak flux Cutoff-PL 8.35e-01 7.80e-01 3.71e-01 1.02e-01 2.06e+00 2.09e+00 ph/cm2/s
Error 1.67e-01 1.09e-01 7.32e-02 1.22e-01 2.43e-01 2.66e-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 2.264 0.141 - - 4.33e-03 3.93e-04 45.400 0
CPL 1.995 0.236 0.8 0.6 6.16e-03 9.24e-04 45.250 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.939 0.195 - - 1.45e-02 1.90e-03 47.420 0
CPL 1.099 0.925 46.0 55.1 4.35e-02 8.38e-02 44.450 0
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: 7.616000 sec.
T50 in the 50-300 keV band: 2.880000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 22.316 7.856 30.172
T90 14.364 11.180 25.544
T50 5.144 14.704 19.848
Peak 1.000 17.172 18.172
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.2393 +31.4281 0.0076 26.3 1.5 1.9472 25.3 TRIG_01000926
------------------------------------------
Foreground time interval of the image:
7.856 30.172 (delta_t = 22.316 [sec])
Background time interval of the image:
-239.000 7.856 (delta_t = 246.856 [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
Time interval is from 7.856 sec. to 30.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26372 ( -0.138018 0.143423 )
Norm@50keV : 4.33325E-03 ( -0.000396158 0.000389705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 45.40 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.66e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 22.32 sec: 0.742290 ( -0.0510935 0.0511757 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.18341e-07 ( -7.00571e-08 7.09198e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.856 sec. to 30.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99505 ( -0.467845 0.00345301 )
Epeak [keV] : 0.776277 ( -0.296313 0.869654 )
Norm@50keV : 6.15816E-03 ( -0.000842222 0.00100491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 45.25 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.47e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 22.32 sec: 0.736272 ( -0.054401 0.054361 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.03248e-07 ( -8.49946e-08 8.25036e-08 ) ergs/cm2
Band function
Time interval is from 7.856 sec. to 30.172 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06197 ( 1.03657 1.03657 )
beta : -2.37495 ( 2.37602 0.204674 )
Epeak [keV] : 22.1991 ( -22.4005 6.70528 )
Norm@50keV : 2.99449E-02 ( -0.0352756 1837.06 )
------------------------------------------------------------
Photon flux (15-150 keV) in 22.32 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] : 8.43932 (-0.703745 0.779877)
R^2/D10^2 : 0.619660 (-0.187862 0.268137)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 97.41 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.87e-04 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.848e-07 2.219e-08
25- 50 3.542e-07 2.835e-08
50-150 1.105e-07 2.407e-08
15-150 6.495e-07 5.881e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.2890 (-8.11771 11.0786)
Norm : 4.28307 (-0.558083 0.681497)
------------------------------------------------------------
#Fit statistic : Chi-Squared 49.89 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.36e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.293e-07 2.166e-08
25- 50 3.202e-07 2.344e-08
50-150 2.885e-07 5.390e-08
15-150 8.380e-07 6.863e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.57359 (-0.830055 0.866496)
R1^2/D10^2 : 2.69762 (-1.16225 2.45938)
kT2 [keV] : 20.4471 (-4.47563 7.39281)
R2^2/D10^2 : 1.21870E-02 (-0.00837114 0.0212646)
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.48 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.69e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.435e-07 4.466e-08
25- 50 2.974e-07 5.877e-08
50-150 3.539e-07 1.650e-07
15-150 8.948e-07 2.538e-07
Peak spectrum fit
Power-law model
Time interval is from 17.172 sec. to 18.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93872 ( -0.190064 0.199741 )
Norm@50keV : 1.44741E-02 ( -0.00192277 0.00188452 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 47.42 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.13e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.11217 ( -0.237176 0.237313 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33158e-07 ( -1.70239e-08 1.72633e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.172 sec. to 18.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09923 ( -1.02042 0.829799 )
Epeak [keV] : 45.9702 ( -16.5194 93.7532 )
Norm@50keV : 4.35477E-02 ( -0.0435516 0.124148 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.45 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.67e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 2.06067 ( -0.24255 0.24273 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24393e-07 ( -1.8432e-08 1.9209e-08 ) ergs/cm2
Band function
Time interval is from 17.172 sec. to 18.172 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.97383 ( -3.53618 -0.597742 )
beta : -2.22590 ( -1.82119 0.318926 )
Epeak [keV] : 28.9580 ( -9.09046 36.0166 )
Norm@50keV : 7.80273 ( -7.59887 655.329 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25396e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.5156 (-1.3176 1.50836)
R^2/D10^2 : 0.833489 (-0.334262 0.556262)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.90 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.42e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.906e-08 3.745e-09
25- 50 5.079e-08 7.475e-09
50-150 3.061e-08 8.625e-09
15-150 1.005e-07 1.434e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.4917 (-20.9499 35.5075)
Norm : 10.3018 (-1.67243 2.03636)
------------------------------------------------------------
#Fit statistic : Chi-Squared 44.57 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.85e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.656e-08 4.255e-09
25- 50 4.280e-08 5.020e-09
50-150 5.696e-08 2.148e-08
15-150 1.263e-07 2.155e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.93356 (-1.77198 2.32195)
R1^2/D10^2 : 4.62476 (-2.9606 12.0466)
kT2 [keV] : 17.8148 (-4.59302 14.3343)
R2^2/D10^2 : 7.71042E-02 (-0.0701272 0.12083)
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.66 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.65e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.620e-08 1.428e-08
25- 50 4.328e-08 2.271e-08
50-150 5.363e-08 3.044e-08
15-150 1.231e-07 6.172e-08
Plot creation:
Wed Oct 21 21:12:10 EDT 2020