batgrbproduct analysis for trigger=1004219
batgrbproduct Analysis for Trigger=1004219
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): Thu Nov 5 23:07:29 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1004219/GCN5_download_cron
======================================================================
Trigger: 01004219 Segment: 000
BAT Trigger Time: 626235749.22 [s; MET]
Trigger Stop: 626235749.252 [s; MET]
UTC: 2020-11-05T02:22:03.293260 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 277.679416248345 Dec: -6.75387339006384 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.67
Image Trigger?: NO
Rate S/N Ratio: 29.4957624075053 [ if not an image trigger ]
Image S/N Ratio: 10.67
Flight Position: [ source = BAT ]
RA: 277.679416248345 Dec: -6.75387339006384 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 277.694834951932 Dec: -6.75614931137034 [deg; J2000]
{ 18h 30m 46.8s , -06d 45' 22.1" }
+/- 2.41008450470676 [arcmin] (estimated 90% radius based on SNR)
+/- 0.989914938895504 [arcmin] (formal 1-sigma fit error)
SNR: 8.6568121499227
Angular difference between Flight and Ground position is 0.928793 arcmin
Partial Coding Fraction: 0.328125 [ including projection effects ]
Duration
T90: 0.0159999132156372 +/- 0.00565686571406321
Measured from: 0.00400006771087646
to: 0.0199999809265137 [s; relative to TRIGTIME]
T50: 0.00800001621246338 +/- 0.004
Measured from: 0.00400006771087646
to: 0.0120000839233398 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.486000061035156
to: 0.513999938964844 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00399994850158691
to: 0.0199999809265137 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.013510 0.038609 0.018240 0.000216
0.003272 0.005236 0.003884 0.000900 [error]
Peak 0.004360 0.049264 0.025714 -0.000585
0.012695 0.013399 0.011626 0.009663 [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 5.90e-09 4.74e-09 2.57e-09 2.04e-09 1.41e-08 1.53e-08 erg/cm2
Error 1.75e-09 1.36e-09 1.05e-09 1.33e-09 4.00e-09 4.52e-09 erg/cm2
Peak flux Power-law 2.48e-01 2.61e-01 1.94e-01 2.33e-01 7.92e-01 9.35e-01 ph/cm2/s
Error 1.78e-01 1.24e-01 8.89e-02 2.12e-01 3.49e-01 3.87e-01 ph/cm2/s
Fluence Cutoff-PL 3.40e-09 1.82e-08 8.32e-09 7.51e-11 3.00e-08 3.00e-08 erg/cm2
Error 1.95e-09 3.75e-09 3.06e-09 1.19e-10 5.71e-09 5.71e-09 erg/cm2
Peak flux Cutoff-PL 1.63e-01 3.19e-01 2.28e-01 4.12e-02 7.45e-01 7.50e-01 ph/cm2/s
Error 1.94e-01 2.80e-01 1.74e-01 2.07e-01 3.54e-01 4.11e-01 ph/cm2/s
Fluence Band 4.06e-09 1.83e-08 9.41e-09 2.14e-10 3.21e-08 3.21e-08 erg/cm2
Error 1.65e-09 3.69e-09 3.28e-09 7.19e-10 6.11e-09 -------- 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 2.873 0.339 - - 7.79e-02 2.64e-02 78.270 0
CPL -5.033 2.784 42.0 3.9 1.88e+03 4.41e+04 35.560 0
The chi2 of BB fit is 42.05 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 1.429 0.677 - - 6.46e-03 2.67e-03 43.500 0
CPL -0.877 8.168 62.2 -18.6 9.29e-02 1.10e+04 42.290 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.016 0.004 0.020
T90 0.016 0.004 0.020
T50 0.008 0.004 0.012
Peak 1.000 -0.486 0.514
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
277.6948 -6.7561 0.0222 46.5 -161.2 0.0665 8.7 TRIG_01004219
------------------------------------------
Foreground time interval of the image:
0.004 0.020 (delta_t = 0.016 [sec])
Background time interval of the image:
-159.119 -41.260 (delta_t = 117.859 [sec])
-40.220 0.004 (delta_t = 40.224 [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 0.004 sec. to 0.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.87250 ( -0.306786 0.371407 )
Norm@50keV : 7.79067E-02 ( -0.0268876 0.0259983 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 78.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.23e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 0.016 sec: 19.5685 ( -5.39874 5.4057 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41369e-08 ( -3.99429e-09 3.99942e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 0.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.03301 ( -3.28188 2.28675 )
Epeak [keV] : 42.0197 ( -3.97691 3.74605 )
Norm@50keV : 1878.96 ( -2093.59 86154.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 35.56 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.85e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 0.016 sec: 31.4801 ( -6.1732 6.215 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00226e-08 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 0.020 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95498 ( -2.18566 -4.95498 )
beta : -9.99772 ( 9.99772 19.9817 )
Epeak [keV] : 42.1086 ( -3.87821 3.12522 )
Norm@50keV : 1708.55 ( -317.592 1679.49 )
------------------------------------------------------------
Photon flux (15-150 keV) in 0.016 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21173e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.79337 (-0.948151 0.878016)
R^2/D10^2 : 19.1304 (-6.54702 9.64849)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.05 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.31e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.934e-09 1.578e-09
25- 50 1.432e-08 3.207e-09
50-150 7.034e-09 2.402e-09
15-150 2.729e-08 6.024e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.2673 (-6.39141 7.5003)
Norm : 210.783 (-61.5117 72.9397)
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.48 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.59e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.895e-09 1.847e-09
25- 50 7.917e-09 2.024e-09
50-150 4.386e-09 1.944e-09
15-150 1.920e-08 4.971e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.217998 (13.1599 -0.217998)
R1^2/D10^2 : 0.283596 (-0.283596 -0.283596)
kT2 [keV] : 9.79409 (-0.948879 0.877287)
R2^2/D10^2 : 19.1252 (-6.54151 9.654)
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.05 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.00e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.486 sec. to 0.514 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42899 ( -0.693696 0.660007 )
Norm@50keV : 6.46040E-03 ( -0.00267349 0.00267236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.50 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.06e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.792021 ( -0.345524 0.352571 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.20712e-08 ( -2.64045e-08 2.6694e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.486 sec. to 0.514 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.876749 ( -8.99256 7.34377 )
Epeak [keV] : 62.1651 ( -24.6136 -61.887 )
Norm@50keV : 9.28955E-02 ( -0.0971702 21904.1 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.29 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.12e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 0.745180 ( -0.348452 0.36005 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.54776e-08 ( -3.0581e-08 2.95874e-08 ) ergs/cm2
Band function
Time interval is from -0.486 sec. to 0.514 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -2.30352 ( 2.30472 1.09889 )
Epeak [keV] : 42.8791 ( -42.8242 16.9549 )
Norm@50keV : 30.4119 ( -11.8511 2.74161e+06 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69327e-08 ( -5.69257e-08 -2.61325e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.0440 (-5.01558 9.14251)
R^2/D10^2 : 0.100420 (-0.100399 0.323992)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.40 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.25e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.756e-09 3.250e-09
25- 50 1.895e-08 1.205e-08
50-150 2.922e-08 2.051e-08
15-150 5.293e-08 3.397e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 3.36704 (-1.38273 1.76458)
------------------------------------------------------------
#Fit statistic : Chi-Squared 43.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.10e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.384e-09 5.565e-09
25- 50 1.613e-08 1.050e-08
50-150 3.537e-08 2.328e-08
15-150 5.988e-08 3.784e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.20981 (-1.76125 22.3453)
R1^2/D10^2 : 1.76554E+04 (-19833.8 -19833.8)
kT2 [keV] : 15.2738 (-5.16509 9.75515)
R2^2/D10^2 : 9.42448E-02 (-0.0789442 0.319475)
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.31 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.95e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Thu Nov 5 23:11:11 EST 2020