batgrbproduct analysis for trigger=1098132
batgrbproduct Analysis for Trigger=1098132
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): Sun Mar 20 21:12:29 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1098132/GCN5_download_cron
======================================================================
Trigger: 01098132 Segment: 000
BAT Trigger Time: 669404462.144 [s; MET]
Trigger Stop: 669404463.168 [s; MET]
UTC: 2022-03-19T17:40:33.333640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 218.207242690197 Dec: 61.2888027725665 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.27
Image Trigger?: NO
Rate S/N Ratio: 15.556349186104 [ if not an image trigger ]
Image S/N Ratio: 7.27
Flight Position: [ source = BAT ]
RA: 218.207242690197 Dec: 61.2888027725665 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 218.139248568129 Dec: 61.2907117057383 [deg; J2000]
{ 14h 32m 33.4s , +61d 17' 26.6" }
+/- 1.91327468704032 [arcmin] (estimated 90% radius based on SNR)
+/- 0.917658400107223 [arcmin] (formal 1-sigma fit error)
SNR: 12.0386930996004
Angular difference between Flight and Ground position is 1.963126 arcmin
Partial Coding Fraction: 0.4375 [ including projection effects ]
Duration
T90: 6.43999993801117 +/- 1.54155770088221
Measured from: -0.21999990940094
to: 6.22000002861023 [s; relative to TRIGTIME]
T50: 3.40399992465973 +/- 0.815139254420364
Measured from: 0.300000071525574
to: 3.7039999961853 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.236000061035156
to: 0.763999938964844 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.364000082015991
to: 6.56399989128113 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.188043 0.175029 0.073181 0.049529
0.022828 0.022786 0.019403 0.015643 [error]
Peak 0.044281 0.079281 0.052454 0.011387
0.009348 0.009518 0.008149 0.005881 [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 5.92e-08 7.32e-08 6.58e-08 1.03e-07 2.34e-07 3.01e-07 erg/cm2
Error 1.12e-08 1.07e-08 1.80e-08 5.47e-08 4.12e-08 7.65e-08 erg/cm2
Peak flux Power-law 5.27e-01 5.05e-01 3.37e-01 3.51e-01 1.51e+00 1.72e+00 ph/cm2/s
Error 1.19e-01 7.64e-02 6.08e-02 1.21e-01 2.23e-01 2.51e-01 ph/cm2/s
Fluence Cutoff-PL 5.88e-08 7.44e-08 6.50e-08 7.81e-08 2.30e-07 2.76e-07 erg/cm2
Error 1.17e-08 1.39e-08 2.15e-08 6.77e-08 4.80e-08 9.96e-08 erg/cm2
Peak flux Cutoff-PL 3.96e-01 6.00e-01 3.85e-01 8.59e-02 1.45e+00 1.47e+00 ph/cm2/s
Error 1.43e-01 1.02e-01 7.84e-02 8.68e-02 2.28e-01 2.40e-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 2.154 0.285 - - 3.61e-03 7.19e-04 53.510 57
CPL 1.976 0.000 5.4 0.0 4.62e-03 0.00e+00 53.490 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.582 0.222 - - 1.18e-02 1.77e-03 64.280 57
CPL -0.163 1.313 60.6 18.8 9.38e-02 2.59e-01 56.770 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: 1.280000 sec.
T50 in the 50-300 keV band: 0.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.928 -0.364 6.564
T90 6.440 -0.220 6.220
T50 3.404 0.300 3.704
Peak 1.000 -0.236 0.764
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
218.1392 +61.2907 0.0158 29.6 -105.4 0.5256 12.0 TRIG_01098132
------------------------------------------
Foreground time interval of the image:
-0.364 6.564 (delta_t = 6.928 [sec])
Background time interval of the image:
-239.144 -17.624 (delta_t = 221.520 [sec])
-16.144 -0.364 (delta_t = 15.780 [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 -0.364 sec. to 6.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15364 ( -0.271304 0.298569 )
Norm@50keV : 3.60689E-03 ( -0.000731147 0.000706621 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.51 using 59 PHA bins.
# Reduced chi-squared = 0.9389 for 57 degrees of freedom
# Null hypothesis probability = 6.066113e-01
Photon flux (15-150 keV) in 6.928 sec: 0.582953 ( -0.0817163 0.0817172 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33527e-07 ( -4.0524e-08 4.19043e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.364 sec. to 6.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97558 ( )
Epeak [keV] : 5.41528 ( )
Norm@50keV : 4.62001E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.49 using 59 PHA bins.
# Reduced chi-squared = 0.9552 for 56 degrees of freedom
# Null hypothesis probability = 5.704603e-01
Photon flux (15-150 keV) in 6.928 sec: 0.580482 ( -0.085158 0.083531 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30034e-07 ( -5.11951e-08 4.48934e-08 ) ergs/cm2
Band function
Time interval is from -0.364 sec. to 6.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32619 ( 1.23709 1.23709 )
beta : -2.31004 ( 2.34278 0.433902 )
Epeak [keV] : 25.4714 ( -25.9963 18.5925 )
Norm@50keV : 1.29834E-02 ( -0.0188316 1984.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.00 using 59 PHA bins.
# Reduced chi-squared = 0.9636 for 55 degrees of freedom
# Null hypothesis probability = 5.515003e-01
Photon flux (15-150 keV) in 6.928 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] : 8.26628 (-1.30217 1.55418)
R^2/D10^2 : 0.558663 (-0.276458 0.547621)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.93 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.744916e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.895e-08 1.281e-08
25- 50 9.061e-08 2.123e-08
50-150 2.647e-08 1.219e-08
15-150 1.660e-07 3.651e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.1989 (-16.5228 31.1853)
Norm : 3.32653 (-0.771888 1.11191)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.614e-08 9.768e-09
25- 50 8.016e-08 1.402e-08
50-150 7.664e-08 3.252e-08
15-150 2.129e-07 4.884e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50849 (-2.72647 2.03567)
R1^2/D10^2 : 1.24956 (-0.771329 7.00358)
kT2 [keV] : 30.6380 (-28.111 -31.9162)
R2^2/D10^2 : 2.25792E-03 (-0.00192053 0.0550551)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.654e-08 2.479e-08
25- 50 7.839e-08 3.559e-08
50-150 1.009e-07 6.035e-08
15-150 2.358e-07 1.031e-07
Peak spectrum fit
Power-law model
Time interval is from -0.236 sec. to 0.764 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58248 ( -0.219617 0.22473 )
Norm@50keV : 1.18335E-02 ( -0.00177148 0.00176027 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.28 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 57 degrees of freedom
# Null hypothesis probability = 2.366641e-01
Photon flux (15-150 keV) in 1 sec: 1.51250 ( -0.222828 0.223261 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10912e-07 ( -1.74956e-08 1.76547e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.236 sec. to 0.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.163072 ( -1.48713 1.13892 )
Epeak [keV] : 60.5972 ( -10.7786 26.7419 )
Norm@50keV : 9.37543E-02 ( -0.0937543 0.42427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 56 degrees of freedom
# Null hypothesis probability = 4.463127e-01
Photon flux (15-150 keV) in 1 sec: 1.45070 ( -0.22754 0.22787 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02566e-07 ( -1.777e-08 1.8449e-08 ) ergs/cm2
Band function
Time interval is from -0.236 sec. to 0.764 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.163314 ( -0.541186 1.16043 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 60.5845 ( -10.2961 12.9668 )
Norm@50keV : 9.37961E-02 ( -0.0131754 0.42553 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.77 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.090394e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03304e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3089 (-1.93813 2.23371)
R^2/D10^2 : 0.219334 (-0.0904624 0.149965)
(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 9.464e-09 2.419e-09
25- 50 3.596e-08 7.775e-09
50-150 4.902e-08 1.391e-08
15-150 9.445e-08 1.830e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 159.485 (-67.2532 -159.463)
Norm : 6.37589 (-0.983709 1.14374)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.629e-08 9.050e-09
25- 50 3.045e-08 1.654e-08
50-150 6.161e-08 3.572e-08
15-150 1.084e-07 6.135e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.37350 (-6.37274 -6.37274)
R1^2/D10^2 : 1.17894 (-1.1794 -1.1794)
kT2 [keV] : 16.9810 (-4.92754 -16.9808)
R2^2/D10^2 : 0.100527 (-0.100535 0.165416)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.281e-08 7.290e-09
25- 50 3.394e-08 1.803e-08
50-150 5.464e-08 3.173e-08
15-150 1.014e-07 5.175e-08
Plot creation:
Sun Mar 20 21:17:31 EDT 2022