batgrbproduct analysis for trigger=1189514
batgrbproduct Analysis for Trigger=1189514
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): Mon Sep 4 12:34:18 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1189514/GCN5_download_cron
======================================================================
Trigger: 01189514 Segment: 000
BAT Trigger Time: 715454608.192 [s; MET]
Trigger Stop: 715454610.24 [s; MET]
UTC: 2023-09-03T17:22:56.248260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 9.92619753724725 Dec: -40.9238279211701 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.63
Image Trigger?: NO
Rate S/N Ratio: 11.6619037896906 [ if not an image trigger ]
Image S/N Ratio: 7.63
Flight Position: [ source = BAT ]
RA: 9.92619753724725 Dec: -40.9238279211701 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 9.89808903892651 Dec: -40.909578552233 [deg; J2000]
{ 00h 39m 35.5s , -40d 54' 34.5" }
+/- 1.85186802813042 [arcmin] (estimated 90% radius based on SNR)
+/- 0.629316043202467 [arcmin] (formal 1-sigma fit error)
SNR: 12.6129981401646
Angular difference between Flight and Ground position is 1.534646 arcmin
Partial Coding Fraction: 0.40625 [ including projection effects ]
Duration
T90: 2.53599989414215 +/- 0.266413158560313
Measured from: 0.276000142097473
to: 2.81200003623962 [s; relative to TRIGTIME]
T50: 1.57999992370605 +/- 0.544249932404332
Measured from: 0.680000066757202
to: 2.25999999046326 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.495999932289124
to: 1.49599993228912 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.195999979972839
to: 2.93199992179871 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.080769 0.160189 0.111688 0.027819
0.016932 0.017979 0.016131 0.013340 [error]
Peak 0.039426 0.068224 0.052035 0.015698
0.010593 0.010973 0.010193 0.008029 [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 2.94e-08 5.73e-08 8.68e-08 2.85e-07 2.44e-07 4.59e-07 erg/cm2
Error 6.40e-09 8.16e-09 1.46e-08 9.80e-08 3.66e-08 1.10e-07 erg/cm2
Peak flux Power-law 4.18e-01 4.35e-01 3.20e-01 3.79e-01 1.32e+00 1.55e+00 ph/cm2/s
Error 1.27e-01 8.87e-02 7.43e-02 1.68e-01 2.58e-01 3.05e-01 ph/cm2/s
Fluence Cutoff-PL 2.10e-08 7.00e-08 9.51e-08 3.70e-08 2.15e-07 2.23e-07 erg/cm2
Error 7.85e-09 1.16e-08 1.88e-08 -------- 3.91e-08 5.78e-08 erg/cm2
Peak flux Cutoff-PL 3.02e-01 5.32e-01 3.62e-01 7.07e-02 1.26e+00 1.27e+00 ph/cm2/s
Error 1.49e-01 1.23e-01 9.99e-02 1.16e-01 2.63e-01 2.78e-01 ph/cm2/s
Fluence Band 1.93e-08 7.22e-08 9.03e-08 9.08e-08 2.20e-07 2.71e-07 erg/cm2
Error -------- 1.26e-08 1.95e-08 1.06e-07 3.89e-08 -------- erg/cm2
Peak flux Band 3.02e-01 5.32e-01 3.62e-01 7.07e-02 1.26e+00 1.27e+00 ph/cm2/s
Error 1.47e-01 -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.401 0.210 - - 9.22e-03 1.27e-03 54.660 57
CPL -0.655 1.486 63.4 17.8 1.02e-01 3.81e-01 44.410 56
The chi2 of BB fit is 45.25 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 1.444 0.289 - - 1.07e-02 2.10e-03 63.440 57
CPL -0.613 1.982 61.1 27.9 1.25e-01 1.13e+00 57.280 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: 2.880000 sec.
T50 in the 50-300 keV band: 1.984000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.736 0.196 2.932
T90 2.536 0.276 2.812
T50 1.580 0.680 2.260
Peak 1.000 0.496 1.496
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
9.8981 -40.9096 0.0153 28.7 93.7 0.4118 12.6 TRIG_01189514
------------------------------------------
Foreground time interval of the image:
0.196 2.932 (delta_t = 2.736 [sec])
Background time interval of the image:
-239.192 -71.942 (delta_t = 167.250 [sec])
-71.192 0.196 (delta_t = 71.388 [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 0.196 sec. to 2.932 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40146 ( -0.209418 0.210237 )
Norm@50keV : 9.21637E-03 ( -0.00126728 0.00126374 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.66 using 59 PHA bins.
# Reduced chi-squared = 0.9590 for 57 degrees of freedom
# Null hypothesis probability = 5.632819e-01
Photon flux (15-150 keV) in 2.736 sec: 1.12277 ( -0.154261 0.154504 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43572e-07 ( -3.6379e-08 3.67945e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.196 sec. to 2.932 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.655309 ( -1.75758 1.21381 )
Epeak [keV] : 63.3905 ( -10.7419 24.8716 )
Norm@50keV : 0.101940 ( -0.101954 0.660616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.7930 for 56 degrees of freedom
# Null hypothesis probability = 8.680719e-01
Photon flux (15-150 keV) in 2.736 sec: 1.05294 ( -0.16106 0.16061 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15123e-07 ( -3.80512e-08 4.01051e-08 ) ergs/cm2
Band function
Time interval is from 0.196 sec. to 2.932 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.31681 ( -1.30158 1.40199 )
beta : -2.65897 ( 9.37167 19.3716 )
Epeak [keV] : 56.6623 ( -11.9523 28.0851 )
Norm@50keV : 0.241122 ( -0.240284 16.3366 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.81 using 59 PHA bins.
# Reduced chi-squared = 0.7966 for 55 degrees of freedom
# Null hypothesis probability = 8.609111e-01
Photon flux (15-150 keV) in 2.736 sec: 1.05578 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20271e-07 ( -2.20252e-07 -3.87177e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.1392 (-1.89046 2.25372)
R^2/D10^2 : 0.136650 (-0.0533267 0.0818364)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.25 using 59 PHA bins.
# Reduced chi-squared = 0.7939 for 57 degrees of freedom
# Null hypothesis probability = 8.692493e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.791e-08 4.402e-09
25- 50 7.178e-08 1.462e-08
50-150 1.124e-07 3.005e-08
15-150 2.021e-07 3.513e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-69.4912 -200)
Norm : 4.68004 (-0.629604 0.629604)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.189e-08 1.795e-08
25- 50 6.134e-08 3.410e-08
50-150 1.345e-07 7.581e-08
15-150 2.278e-07 1.273e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.4543 (-12.5134 -12.5134)
R1^2/D10^2 : 0.201861 (-0.200147 -0.200147)
kT2 [keV] : 28.7874 (-30.2397 -30.2397)
R2^2/D10^2 : 5.43423E-03 (-0.00424504 0.187427)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.074e-08 6.491e-09
25- 50 6.946e-08 1.643e-08
50-150 1.157e-07 3.628e-08
15-150 2.059e-07 5.476e-08
Peak spectrum fit
Power-law model
Time interval is from 0.496 sec. to 1.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44401 ( -0.286218 0.291003 )
Norm@50keV : 1.07240E-02 ( -0.00210769 0.00209869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.44 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.599727e-01
Photon flux (15-150 keV) in 1 sec: 1.31954 ( -0.257442 0.25794 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02752e-07 ( -2.16374e-08 2.19651e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.496 sec. to 1.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.612642 ( -2.45137 1.51337 )
Epeak [keV] : 61.1364 ( -13.3719 42.4607 )
Norm@50keV : 0.125238 ( -0.125238 2.13472 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 56 degrees of freedom
# Null hypothesis probability = 4.273662e-01
Photon flux (15-150 keV) in 1 sec: 1.25655 ( -0.263199 0.26358 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.14771e-08 ( -2.21796e-08 2.38929e-08 ) ergs/cm2
Band function
Time interval is from 0.496 sec. to 1.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.612741 ( -1.25033 4.51752 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 61.1274 ( -12.2697 42.5777 )
Norm@50keV : 0.125273 ( -0.125273 2.14574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.28 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 55 degrees of freedom
# Null hypothesis probability = 3.905224e-01
Photon flux (15-150 keV) in 1 sec: 1.25654 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.3263e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.5871 (-2.53239 3.22193)
R^2/D10^2 : 0.183744 (-0.0939099 0.175456)
(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 8.220e-09 2.686e-09
25- 50 3.182e-08 1.013e-08
50-150 4.549e-08 1.736e-08
15-150 8.553e-08 2.484e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-100.533 -199.363)
Norm : 5.51731 (-1.0507 1.05095)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.374e-08 8.010e-09
25- 50 2.643e-08 1.529e-08
50-150 5.796e-08 3.327e-08
15-150 9.813e-08 5.730e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.5657 (-11.655 -11.655)
R1^2/D10^2 : 0.292902 (-0.288325 -0.288325)
kT2 [keV] : 26.0838 (-27.6795 -27.6795)
R2^2/D10^2 : 9.94436E-03 (-0.00721604 0.312985)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.403e-09 7.100e-09
25- 50 3.151e-08 3.062e-08
50-150 5.282e-08 5.485e-08
15-150 9.374e-08 8.255e-08
Plot creation:
Mon Sep 4 12:37:04 EDT 2023