batgrbproduct analysis for trigger=1218452
batgrbproduct Analysis for Trigger=1218452
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 Mar 4 11:08:04 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1218452/GCN5_download_cron
======================================================================
Trigger: 01218452 Segment: 000
BAT Trigger Time: 731140432 [s; MET]
Trigger Stop: 731140496 [s; MET]
UTC: 2024-03-03T06:33:18.982080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 229.748049918717 Dec: -57.3754252077892 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.38
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.38
Flight Position: [ source = BAT ]
RA: 229.748049918717 Dec: -57.3754252077892 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 229.7724590644 Dec: -57.3674946868072 [deg; J2000]
{ 15h 19m 05.4s , -57d 22' 03.0" }
+/- 2.19619366990554 [arcmin] (estimated 90% radius based on SNR)
+/- 1.12902347815081 [arcmin] (formal 1-sigma fit error)
SNR: 9.88592866188488
Angular difference between Flight and Ground position is 0.921952 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 773.167999863625 +/- 43.2787931646774
Measured from: -52.9279998540878
to: 720.240000009537 [s; relative to TRIGTIME]
T50: 448.451999902725 +/- 48.0617557365289
Measured from: 104.588000178337
to: 553.040000081062 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -80.6039999723434
to: -79.6039999723434 [s; relative to TRIGTIME]
Total Fluence
Measured from: -82.6920000314713
to: 750.728000044823 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.068686 5.004636 1.501704 0.258053
0.211160 0.194282 0.158436 0.136499 [error]
Peak 0.015030 0.027078 0.006640 0.017329
0.007936 0.007483 0.006158 0.005458 [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 1.94e-06 1.97e-06 1.41e-06 1.61e-06 5.95e-06 6.93e-06 erg/cm2
Error 1.46e-07 1.02e-07 1.44e-07 3.22e-07 3.30e-07 4.95e-07 erg/cm2
Peak flux Power-law 1.91e-01 1.43e-01 7.10e-02 5.04e-02 4.29e-01 4.56e-01 ph/cm2/s
Error 1.57e-01 5.95e-02 5.32e-02 9.23e-02 1.75e-01 1.88e-01 ph/cm2/s
Fluence Cutoff-PL 1.81e-06 2.11e-06 1.26e-06 4.13e-07 5.47e-06 5.59e-06 erg/cm2
Error 1.68e-07 1.35e-07 1.92e-07 -------- 4.13e-07 5.82e-07 erg/cm2
Peak flux Cutoff-PL 1.95e-01 1.43e-01 6.91e-02 4.71e-02 4.29e-01 4.54e-01 ph/cm2/s
Error 1.19e-01 8.17e-02 5.88e-02 9.15e-02 1.74e-01 1.56e-01 ph/cm2/s
Fluence Band 1.81e-06 2.03e-06 1.31e-06 1.31e-06 5.72e-06 6.48e-06 erg/cm2
Error 1.80e-07 1.36e-07 1.85e-07 -------- 3.65e-07 -------- 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 2.482 0.112 - - 7.37e-04 5.35e-05 77.200 57
CPL 1.680 0.508 15.1 11.0 2.24e-03 0.00e+00 69.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.007 1.042 - - 2.85e-03 2.18e-03 87.960 57
CPL 2.130 5.329 51.5 0.0 2.01e-03 0.00e+00 87.450 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 833.420 -82.692 750.728
T90 773.168 -52.928 720.240
T50 448.452 104.588 553.040
Peak 1.000 -80.604 -79.604
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
229.7725 -57.3675 0.0194 17.6 47.0 1.9766 9.9 TRIG_01218452
------------------------------------------
Foreground time interval of the image:
-15.999 72.301 (delta_t = 88.300 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
-82.692000 265.800000
285.000000 334.320000
335.000000 528.190000
529.000000 556.920000
558.000000 633.720000
635.000000 750.728000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.48196 ( -0.110653 0.113889 )
Norm@50keV : 7.37141E-04 ( -5.36885e-05 5.32699e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.20 using 59 PHA bins.
# Reduced chi-squared = 1.354 for 57 degrees of freedom
# Null hypothesis probability = 3.865089e-02
Photon flux (15-150 keV) in 810.4 sec: 0.143223 ( -0.00760629 0.00762929 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94506e-06 ( -3.2848e-07 3.31243e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-82.692000 265.800000
285.000000 334.320000
335.000000 528.190000
529.000000 556.920000
558.000000 633.720000
635.000000 750.728000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68036 ( -0.60096 0.414989 )
Epeak [keV] : 15.1055 ( -11.7471 10.2982 )
Norm@50keV : 2.23580E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.78 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 56 degrees of freedom
# Null hypothesis probability = 1.019955e-01
Photon flux (15-150 keV) in 810.4 sec: 0.137000 ( -0.008482 0.008507 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.47135e-06 ( -4.01091e-07 4.25663e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-82.692000 265.800000
285.000000 334.320000
335.000000 528.190000
529.000000 556.920000
558.000000 633.720000
635.000000 750.728000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31655 ( -0.572302 1.31963 )
beta : -2.92974 ( 2.9335 0.440939 )
Epeak [keV] : 20.4271 ( -11.6966 6.39831 )
Norm@50keV : 3.96965E-03 ( -0.00228018 183.837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.88 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 55 degrees of freedom
# Null hypothesis probability = 9.883466e-02
Photon flux (15-150 keV) in 810.4 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.71523e-06 ( -5.70956e-06 -3.66195e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.06447 ( )
R^2/D10^2 : 0.139691 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 119.25 using 59 PHA bins.
# Reduced chi-squared = 2.0921 for 57 degrees of freedom
# Null hypothesis probability = 2.684221e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.339e-06 1.240e-07
25- 50 2.377e-06 1.370e-07
50-150 6.407e-07 1.039e-07
15-150 4.357e-06 2.682e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.6960 (-4.12147 4.91257)
Norm : 0.990809 (-0.112803 0.130024)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.748e-06 1.329e-07
25- 50 2.154e-06 1.191e-07
50-150 1.416e-06 2.241e-07
15-150 5.318e-06 3.420e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.72553 (-0.93244 1.05282)
R1^2/D10^2 : 0.915384 (-0.482213 0.922219)
kT2 [keV] : 13.1314 (-2.2771 4.16897)
R2^2/D10^2 : 1.23093E-02 (-0.00895569 0.0106564)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.796e-06 5.231e-07
25- 50 2.081e-06 4.939e-07
50-150 1.417e-06 6.235e-07
15-150 5.295e-06 1.508e-06
Peak spectrum fit
Power-law model
Time interval is from -80.604 sec. to -79.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00719 ( -0.940217 1.14432 )
Norm@50keV : 2.84835E-03 ( -0.00284791 0.00150682 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.96 using 59 PHA bins.
# Reduced chi-squared = 1.543 for 57 degrees of freedom
# Null hypothesis probability = 5.293239e-03
Photon flux (15-150 keV) in 1 sec: 0.428671 ( -0.174616 0.1746 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62729e-08 ( -1.30823e-08 1.45416e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -80.604 sec. to -79.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12981 ( -9.63428 1.02283 )
Epeak [keV] : 51.5204 ( )
Norm@50keV : 2.01008E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.45 using 59 PHA bins.
# Reduced chi-squared = 1.562 for 56 degrees of freedom
# Null hypothesis probability = 4.552169e-03
Photon flux (15-150 keV) in 1 sec: 0.428769 ( -0.174535 0.174353 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57107e-08 ( -1.25625e-08 1.48067e-08 ) ergs/cm2
Band function
Time interval is from -80.604 sec. to -79.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51206 ( 1.51692 1.51692 )
beta : -1.97961 ( 1.99113 0.92259 )
Epeak [keV] : 16.0928 ( -11.8386 -11.8386 )
Norm@50keV : 7.95867E-03 ( -0.0086617 0.583339 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.96 using 59 PHA bins.
# Reduced chi-squared = 1.599 for 55 degrees of freedom
# Null hypothesis probability = 3.146965e-03
Photon flux (15-150 keV) in 1 sec: ( ) 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] : 8.32758 (-2.77508 4.53545)
R^2/D10^2 : 0.400501 (-0.400498 1.59763)
(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 5.166e-09 3.308e-09
25- 50 9.682e-09 6.320e-09
50-150 2.896e-09 2.572e-09
15-150 1.775e-08 1.167e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.3430 (-59.7203 -59.7203)
Norm : 2.20595 (-1.19986 4.14463)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.534e-09 3.635e-09
25- 50 8.394e-09 5.580e-09
50-150 9.464e-09 8.235e-09
15-150 2.339e-08 1.635e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.38082 (-2.93754 2.65577)
R1^2/D10^2 : 0.575372 (-0.358812 4.04457)
kT2 [keV] : 199.119 (-199.267 -199.267)
R2^2/D10^2 : 7.09853E-05 (-5.51708e-05 0.00224292)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.757e-09 2.770e-09
25- 50 8.760e-09 5.700e-09
50-150 3.940e-09 3.179e-09
15-150 1.846e-08 1.136e-08
Plot creation:
Mon Mar 4 11:12:26 EST 2024