batgrbproduct analysis for trigger=1205103
batgrbproduct Analysis for Trigger=1205103
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): Fri Dec 29 10:18:12 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1205103/GCN5_download_cron
======================================================================
Trigger: 01205103 Segment: 000
BAT Trigger Time: 725443992 [s; MET]
Trigger Stop: 725444056 [s; MET]
UTC: 2023-12-28T08:12:39.372420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.539856394607 Dec: -15.6397610980204 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.18
Flight Position: [ source = BAT ]
RA: 245.539856394607 Dec: -15.6397610980204 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.369718086355 Dec: -15.7203361891098 [deg; J2000]
{ 16h 21m 28.7s , -15d 43' 13.2" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 4.20865998185608 [arcmin] (formal 1-sigma fit error)
SNR: -3.45989165260732
Angular difference between Flight and Ground position is 10.953081 arcmin
Partial Coding Fraction: 0.5859375 [ including projection effects ]
Duration
T90: 139.011999964714 +/- 49.431577534294
Measured from: 171.556000113487
to: 310.568000078201 [s; relative to TRIGTIME]
T50: 73.691999912262 +/- 54.0094421813266
Measured from: 195.748000144958
to: 269.44000005722 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 309.93599998951
to: 310.93599998951 [s; relative to TRIGTIME]
Total Fluence
Measured from: 145.5
to: 312.692000031471 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.016837 0.335832 -0.096637 -0.004413
0.127594 0.125033 0.112733 0.096501 [error]
Peak 0.037785 0.029907 0.012868 0.004706
0.009979 0.009026 0.008805 0.007413 [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 1.31e-06 2.07e-07 1.52e-08 1.19e-09 1.53e-06 1.53e-06 erg/cm2
Error 1.41e-07 5.15e-08 8.95e-09 1.23e-09 1.56e-07 1.56e-07 erg/cm2
Peak flux Power-law 4.57e-01 2.21e-01 6.52e-02 2.43e-02 7.57e-01 7.68e-01 ph/cm2/s
Error 1.64e-01 9.17e-02 5.80e-02 4.57e-02 2.27e-01 2.35e-01 ph/cm2/s
Fluence Cutoff-PL 1.34e-06 1.23e-07 7.47e-11 5.24e-18 1.47e-06 1.47e-06 erg/cm2
Error 1.50e-07 6.30e-08 1.69e-09 2.40e-12 1.55e-07 1.56e-07 erg/cm2
Peak flux Cutoff-PL 4.65e-01 2.15e-01 6.06e-02 2.07e-02 7.53e-01 7.65e-01 ph/cm2/s
Error -------- -------- -------- -------- 2.28e-01 2.34e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.98e-01 3.66e-02 1.33e-03 5.01e-05 4.36e-01 4.36e-01 ph/cm2/s
Error -------- -------- -------- -------- 5.15e-02 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.772 0.485 - - 9.21e-05 4.41e-05 56.370 57
CPL 1.000 0.000 50.0 0.0 1.97e-03 0.00e+00 263.990 56
The chi2 of BB fit is 50.14 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 2.761 0.924 - - 3.26e-03 2.19e-03 57.910 57
CPL 1.975 0.000 1.1 0.0 1.04e-02 0.00e+00 58.530 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 167.192 145.500 312.692
T90 139.012 171.556 310.568
T50 73.692 195.748 269.440
Peak 1.000 309.936 310.936
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.3697 -15.7203 0.0558 26.2 -109.6 -1.4625 -3.5 TRIG_01205103
------------------------------------------
Foreground time interval of the image:
145.500 312.692 (delta_t = 167.192 [sec])
Background time interval of the image:
-239.000 -217.510 (delta_t = 21.490 [sec])
-216.000 -214.640 (delta_t = 1.360 [sec])
-214.000 -151.170 (delta_t = 62.830 [sec])
-150.000 -148.590 (delta_t = 1.410 [sec])
-119.000 63.890 (delta_t = 182.890 [sec])
65.000 145.500 (delta_t = 80.500 [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 145.500 sec. to 312.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.77206 ( -0.472535 0.49799 )
Norm@50keV : 9.21000E-05 ( -3.62053e-05 5.20588e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.37 using 59 PHA bins.
# Reduced chi-squared = 0.9890 for 57 degrees of freedom
# Null hypothesis probability = 4.986061e-01
Photon flux (15-150 keV) in 167.2 sec: 0.301807 ( -0.0311182 0.0311595 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53382e-06 ( -1.55487e-07 1.55572e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 145.500 sec. to 312.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.97124E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 263.99 using 59 PHA bins.
# Reduced chi-squared = 4.7141 for 56 degrees of freedom
# Null hypothesis probability = 9.814067e-29
Photon flux (15-150 keV) in 167.2 sec: 0.295703 ( -0.033241 0.032691 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46807e-06 ( -1.56765e-07 1.53968e-07 ) ergs/cm2
Band function
Time interval is from 145.500 sec. to 312.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.15559 ( 2.64529 8.15559 )
beta : -5.83524 ( -0.451156 0.52689 )
Epeak [keV] : 379.303 ( -379.303 -379.303 )
Norm@50keV : 1.17466E-02 ( -0.00442995 0.00762681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.42 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.216292e-01
Photon flux (15-150 keV) in 167.2 sec: 0.435693 ( 6.56431 -0.051518 ) 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] : 2.63623 (-0.226992 0.25638)
R^2/D10^2 : 100.635 (-50.0635 101.267)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.14 using 59 PHA bins.
# Reduced chi-squared = 0.8796 for 57 degrees of freedom
# Null hypothesis probability = 7.281315e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.345e-06 3.561e-07
25- 50 1.220e-07 3.743e-08
50-150 6.393e-11 5.118e-11
15-150 1.468e-06 3.346e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.74880 (-0.609139 0.74079)
Norm : 83.6719 (-36.0642 66.4364)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.342e-06 3.148e-07
25- 50 1.505e-07 4.808e-08
50-150 5.978e-10 4.946e-10
15-150 1.493e-06 3.444e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.63409 (-0.240835 0.250193)
R1^2/D10^2 : 101.191 (-48.0451 103.911)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.09790E-06 (-1.0979e-06 -1.0979e-06)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.347e-06 3.241e-07
25- 50 1.248e-07 3.987e-08
50-150 6.944e-11 5.959e-11
15-150 1.472e-06 3.464e-07
Peak spectrum fit
Power-law model
Time interval is from 309.936 sec. to 310.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.76051 ( -0.757198 1.09049 )
Norm@50keV : 3.25926E-03 ( -0.00209463 0.00229299 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.416095e-01
Photon flux (15-150 keV) in 1 sec: 0.757493 ( -0.22708 0.227614 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54381e-08 ( -1.40305e-08 1.66792e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 309.936 sec. to 310.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97542 ( )
Epeak [keV] : 1.06773 ( )
Norm@50keV : 1.04497E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.53 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 56 degrees of freedom
# Null hypothesis probability = 3.826991e-01
Photon flux (15-150 keV) in 1 sec: 0.753354 ( -0.223811 0.231868 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.5083e-08 ( -1.40924e-08 1.66832e-08 ) ergs/cm2
Band function
Time interval is from 309.936 sec. to 310.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.95192 ( 9.95192 9.95192 )
beta : -2.76052 ( -1.09083 0.75684 )
Epeak [keV] : 4.74507 ( -4.74507 -4.74507 )
Norm@50keV : 0.442974 ( -0.284675 0.311665 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Null hypothesis probability = 3.685269e-01
Photon flux (15-150 keV) in 1 sec: 0.435693 ( 6.56431 -0.051518 ) 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] : 5.25169 (-1.67967 2.56176)
R^2/D10^2 : 4.75259 (-4.74964 25.897)
(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 1.401e-08 8.420e-09
25- 50 1.031e-08 6.600e-09
50-150 5.288e-10 5.055e-10
15-150 2.485e-08 1.581e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.1932 (-12.0533 43.0975)
Norm : 8.33624 (-4.91303 19.0499)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.356e-08 8.234e-09
25- 50 1.240e-08 7.519e-09
50-150 4.088e-09 3.684e-09
15-150 3.005e-08 1.871e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.04108 (-4.04305 2.86006)
R1^2/D10^2 : 13.8393 (-13.7959 -13.7959)
kT2 [keV] : 18.3497 (-18.3747 -18.3747)
R2^2/D10^2 : 1.72010E-02 (-0.0171085 5.49899)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.437e-08 8.365e-09
25- 50 1.032e-08 5.320e-09
50-150 1.334e-08 9.480e-09
15-150 3.803e-08 1.967e-08
Plot creation:
Fri Dec 29 10:20:35 EST 2023