batgrbproduct analysis for trigger=1086826
batgrbproduct Analysis for Trigger=1086826
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): Sat Dec 4 11:03:59 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1086826/GCN5_download_cron
======================================================================
Trigger: 01086826 Segment: 000
BAT Trigger Time: 660214986.56 [s; MET]
Trigger Stop: 660214987.584 [s; MET]
UTC: 2021-12-03T09:02:38.369880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.174129062455 Dec: 16.2557010562344 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.51
Image Trigger?: NO
Rate S/N Ratio: 22.7376340018041 [ if not an image trigger ]
Image S/N Ratio: 6.51
Flight Position: [ source = BAT ]
RA: 170.174129062455 Dec: 16.2557010562344 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.168692273609 Dec: 16.2497117480582 [deg; J2000]
{ 11h 20m 40.5s , +16d 14' 59.0" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 2.24707006106929 [arcmin] (formal 1-sigma fit error)
SNR: -4.27718964457076
Angular difference between Flight and Ground position is 0.476670 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 0.0600000619888306 +/- 0.004
Measured from: 9.17600011825562
to: 9.23600018024445 [s; relative to TRIGTIME]
T50: 0.0359998941421509 +/- 0.004
Measured from: 9.18800020217896
to: 9.22400009632111 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.71000003814697
to: 9.71000003814697 [s; relative to TRIGTIME]
Total Fluence
Measured from: 9.17599999904633
to: 9.24000000953674 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.004721 -0.003949 -0.004654 -0.004920
0.001653 0.001829 0.001999 0.001884 [error]
Peak -0.002229 0.003607 -0.010397 -0.002422
0.007130 0.007589 0.007064 0.007878 [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 0.00e+00 0.00e+00 0.00e+00 0.00e+002.66e-09 0.00e+00 0.00e+00 erg/cm2
Error 7.04e-11 6.35e-11 1.46e-10 4.75e-09 4.08e-10 5.06e-09 erg/cm2
Peak flux Power-law 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 3.75e-02 1.88e-02 1.16e-02 1.47e-01 5.87e-02 1.52e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 7.04e-11 9.48e-11 2.60e-10 -------- 3.93e-10 2.43e-08 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 5.91e-02 5.05e-02 1.68e-02 -------- 8.69e-02 -------- ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 5.43e-02 -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 0.000 - - 0.00e+00 4.94e-04 67.010 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 67.010 56
The chi2 of BB fit is 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 1.500 0.000 - - 0.00e+00 3.86e-04 51.450 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 51.450 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.064 9.176 9.240
T90 0.060 9.176 9.236
T50 0.036 9.188 9.224
Peak 1.000 8.710 9.710
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.1687 +16.2497 0.0450 17.6 113.6 -0.0170 -4.3 TRIG_01086826
------------------------------------------
Foreground time interval of the image:
9.176 9.240 (delta_t = 0.064 [sec])
Background time interval of the image:
-239.560 -187.050 (delta_t = 52.510 [sec])
-185.560 -142.720 (delta_t = 42.840 [sec])
-141.560 -135.960 (delta_t = 5.600 [sec])
-134.560 -54.020 (delta_t = 80.540 [sec])
-52.560 9.176 (delta_t = 61.736 [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 9.176 sec. to 9.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.000988035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.01 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.711342e-01
Photon flux (15-150 keV) in 0.064 sec: 0.0 ( 0 0.113575 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 8.1552e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.176 sec. to 9.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.01 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 56 degrees of freedom
# Null hypothesis probability = 1.488125e-01
Photon flux (15-150 keV) in 0.064 sec: 0.0 ( 0 0.113488 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 7.86816e-10 ) ergs/cm2
Band function
Time interval is from 9.176 sec. to 9.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.33134 ( 0.98395 0.98395 )
beta : 1.36546 ( 2.5 2.5 )
Epeak [keV] : 0.310441 ( -80 -80 )
Norm@50keV : 6.73061E-03 ( -0.00610264 1.92082e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.58 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.361972e-01
Photon flux (15-150 keV) in 0.064 sec: 0.0 ( ) 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] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.01 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.711342e-01
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
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
Reduced chi-squared =
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
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.287 (-199.33 -199.33)
R1^2/D10^2 : 9.05165E-06 (-9.3273e-06 -9.3273e-06)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
Reduced chi-squared =
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 8.710 sec. to 9.710 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.0007727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.45 using 59 PHA bins.
# Reduced chi-squared = 0.9027 for 57 degrees of freedom
# Null hypothesis probability = 6.824107e-01
Photon flux (15-150 keV) in 1 sec: 0.0 ( 0 0.117403 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 7.32663e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.710 sec. to 9.710 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.45 using 59 PHA bins.
# Reduced chi-squared = 0.9188 for 56 degrees of freedom
# Null hypothesis probability = 6.474478e-01
Photon flux (15-150 keV) in 1 sec: 0.0 ( 0 0.173892 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 7.27755e-09 ) ergs/cm2
Band function
Time interval is from 8.710 sec. to 9.710 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.62417 ( 0.98395 0.98395 )
beta : -9.37073 ( 2.5 2.5 )
Epeak [keV] : 24.6329 ( -80 -80 )
Norm@50keV : 1.22429 ( -2.7049 42.6977 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.43 using 59 PHA bins.
# Reduced chi-squared = 0.9351 for 55 degrees of freedom
# Null hypothesis probability = 6.118690e-01
Photon flux (15-150 keV) in 1 sec: 0.0 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.90033 (-6.15112 -6.15112)
R^2/D10^2 : 2.16564E-02 (-0.0236056 -0.0236056)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.776e-11 5.970e-12
25- 50 9.397e-11 1.736e-09
50-150 8.030e-12 2.596e-32
15-150 1.998e-10 6.585e-10
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
Reduced chi-squared =
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
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.00000 (-4 -4)
R1^2/D10^2 : 0.0 (0 0)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
Reduced chi-squared =
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:
Sat Dec 4 11:14:46 EST 2021