batgrbproduct analysis for trigger=1154967
batgrbproduct Analysis for Trigger=1154967
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 Feb 18 18:51:13 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1154967/GCN5_download_cron
======================================================================
Trigger: 01154967 Segment: 000
BAT Trigger Time: 698363621.68 [s; MET]
Trigger Stop: 698363621.744 [s; MET]
UTC: 2023-02-17T21:53:10.903120 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.771001700138 Dec: -28.8556023658531 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.87
Image Trigger?: NO
Rate S/N Ratio: 111.458512460915 [ if not an image trigger ]
Image S/N Ratio: 8.87
Flight Position: [ source = BAT ]
RA: 280.771001700138 Dec: -28.8556023658531 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.758979128224 Dec: -28.8397306439623 [deg; J2000]
{ 18h 43m 02.2s , -28d 50' 23.0" }
+/- 1.28693917162965 [arcmin] (estimated 90% radius based on SNR)
+/- 0.407263786251537 [arcmin] (formal 1-sigma fit error)
SNR: 21.2132359602624
Angular difference between Flight and Ground position is 1.142848 arcmin
Partial Coding Fraction: 0.2148438 [ including projection effects ]
Duration
T90: 1.2960000038147 +/- 0.450564136169318
Measured from: -0.0879999399185181
to: 1.20800006389618 [s; relative to TRIGTIME]
T50: 0.448000073432922 +/- 0.0861627008446912
Measured from: 0.0559999942779541
to: 0.504000067710876 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.24399995803833
to: 0.75600004196167 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.263999938964844
to: 1.75200009346008 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.459616 0.832423 1.114276 0.599047
0.049233 0.060760 0.066727 0.060053 [error]
Peak 0.344405 0.673001 1.030380 0.536719
0.040095 0.053239 0.061423 0.056218 [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 1.67e-07 4.20e-07 8.47e-07 4.29e-06 2.29e-06 5.72e-06 erg/cm2
Error 2.35e-08 3.52e-08 6.24e-08 7.35e-07 1.65e-07 7.63e-07 erg/cm2
Peak flux Power-law 3.91e+00 5.80e+00 6.44e+00 1.35e+01 2.02e+01 2.96e+01 ph/cm2/s
Error 5.88e-01 5.37e-01 4.72e-01 2.13e+00 1.46e+00 2.38e+00 ph/cm2/s
Fluence Cutoff-PL 1.67e-07 4.21e-07 8.48e-07 4.25e-06 2.29e-06 5.68e-06 erg/cm2
Error 1.91e-08 3.58e-08 5.05e-08 1.12e-06 1.64e-07 1.25e-06 erg/cm2
Peak flux Cutoff-PL 3.65e+00 5.86e+00 6.66e+00 1.09e+01 2.01e+01 2.70e+01 ph/cm2/s
Error 5.57e-01 5.64e-01 6.27e-01 3.55e+00 1.47e+00 4.23e+00 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 0.988 0.119 - - 1.04e-01 7.13e-03 52.380 57
CPL 0.984 0.121 9999.4 0.0 1.05e-01 2.96e-02 52.390 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.850 0.121 - - 1.76e-01 1.28e-02 64.420 57
CPL 0.617 0.420 364.3 0.0 2.21e-01 9.22e-02 63.660 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: 0.768000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.016 -0.264 1.752
T90 1.296 -0.088 1.208
T50 0.448 0.056 0.504
Peak 1.000 -0.244 0.756
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.7590 -28.8397 0.0091 49.1 -18.0 3.1024 21.2 TRIG_01154967
------------------------------------------
Foreground time interval of the image:
-0.264 1.752 (delta_t = 2.016 [sec])
Background time interval of the image:
-240.680 -167.550 (delta_t = 73.130 [sec])
-166.680 -111.050 (delta_t = 55.630 [sec])
-109.680 -69.440 (delta_t = 40.240 [sec])
-68.680 -0.264 (delta_t = 68.416 [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 -0.264 sec. to 1.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.987971 ( -0.119911 0.117954 )
Norm@50keV : 0.104399 ( -0.00714262 0.00711799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.38 using 59 PHA bins.
# Reduced chi-squared = 0.9190 for 57 degrees of freedom
# Null hypothesis probability = 6.487224e-01
Photon flux (15-150 keV) in 2.016 sec: 12.0118 ( -0.835896 0.838309 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28562e-06 ( -1.65182e-07 1.6576e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.264 sec. to 1.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.984373 ( -0.125537 0.117331 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 0.105049 ( -0.00706711 0.0520922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.39 using 59 PHA bins.
# Reduced chi-squared = 0.9355 for 56 degrees of freedom
# Null hypothesis probability = 6.124036e-01
Photon flux (15-150 keV) in 2.016 sec: 12.0127 ( -0.8359 0.8341 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28578e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.264 sec. to 1.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.02941 ( -0.130485 0.128494 )
Epeak [keV] : 26.9072 ( -26.9072 5.5187 )
Norm@50keV : 4551.38 ( -303.387 1.66575e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.06 using 59 PHA bins.
# Reduced chi-squared = 0.9284 for 55 degrees of freedom
# Null hypothesis probability = 6.258024e-01
Photon flux (15-150 keV) in 2.016 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] : 24.0276 (-2.26272 2.60416)
R^2/D10^2 : 0.328427 (-0.0891978 0.118355)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.53 using 59 PHA bins.
# Reduced chi-squared = 1.7637 for 57 degrees of freedom
# Null hypothesis probability = 3.316946e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.779e-08 9.143e-09
25- 50 3.767e-07 4.183e-08
50-150 1.620e-06 1.670e-07
15-150 2.065e-06 1.741e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 48.9693 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.458e-07 2.016e-08
25- 50 4.729e-07 4.838e-08
50-150 1.037e-06 2.532e-07
15-150 1.756e-06 3.017e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.61459 (-1.54163 2.00234)
R1^2/D10^2 : 7.04910 (-3.74686 8.50436)
kT2 [keV] : 37.7967 (-6.54172 11.464)
R2^2/D10^2 : 7.33813E-02 (-0.0386924 0.057415)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.717e-07 5.541e-08
25- 50 4.201e-07 1.219e-07
50-150 1.744e-06 4.661e-07
15-150 2.336e-06 5.329e-07
Peak spectrum fit
Power-law model
Time interval is from -0.244 sec. to 0.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.849566 ( -0.122136 0.119506 )
Norm@50keV : 0.176332 ( -0.0128187 0.0127487 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.42 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.330662e-01
Photon flux (15-150 keV) in 1 sec: 20.2416 ( -1.45746 1.45879 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01889e-06 ( -1.52298e-07 1.52569e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.244 sec. to 0.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.617135 ( -0.496609 0.343876 )
Epeak [keV] : 364.292 ( -364.292 -364.292 )
Norm@50keV : 0.221224 ( -0.0542525 0.130187 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.66 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 56 degrees of freedom
# Null hypothesis probability = 2.250480e-01
Photon flux (15-150 keV) in 1 sec: 20.1303 ( -1.4725 1.4736 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01225e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.244 sec. to 0.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.892608 ( 0.892608 0.892608 )
beta : -0.849561 ( -0.119494 0.122178 )
Epeak [keV] : 13.7953 ( -13.7953 -13.7953 )
Norm@50keV : 0.261562 ( -0.0978546 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.42 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Null hypothesis probability = 1.802852e-01
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] : 25.6589 (-2.4227 2.8211)
R^2/D10^2 : 0.479421 (-0.128678 0.168057)
(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 5.407e-08 7.890e-09
25- 50 3.108e-07 3.665e-08
50-150 1.511e-06 1.535e-07
15-150 1.876e-06 1.555e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 78.8001 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.962e-07 1.635e-08
25- 50 3.775e-07 7.340e-08
50-150 8.278e-07 2.835e-07
15-150 1.402e-06 3.734e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.81568 (-2.03077 2.93425)
R1^2/D10^2 : 8.58165 (-5.29789 15.2985)
kT2 [keV] : 36.6528 (-6.22344 11.6377)
R2^2/D10^2 : 0.148228 (-0.0820505 0.114277)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.204e-07 5.498e-08
25- 50 3.379e-07 1.083e-07
50-150 1.588e-06 4.259e-07
15-150 2.046e-06 5.160e-07
Plot creation:
Sat Feb 18 18:54:26 EST 2023