batgrbproduct analysis for trigger=1159327
batgrbproduct Analysis for Trigger=1159327
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 Mar 11 14:22:17 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1159327/GCN5_download_cron
======================================================================
Trigger: 01159327 Segment: 000
BAT Trigger Time: 700174866.432 [s; MET]
Trigger Stop: 700174866.464 [s; MET]
UTC: 2023-03-10T21:00:35.531760 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 272.154353442046 Dec: -20.4159979539366 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 22.11
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 22.11
Flight Position: [ source = BAT ]
RA: 272.154353442046 Dec: -20.4159979539366 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.155209366981 Dec: -20.4194043954696 [deg; J2000]
{ 18h 08m 37.3s , -20d 25' 09.9" }
+/- 0.543585166118221 [arcmin] (estimated 90% radius based on SNR)
+/- 0.169501666761723 [arcmin] (formal 1-sigma fit error)
SNR: 72.6620301055977
Angular difference between Flight and Ground position is 0.209977 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 0.447999954223633 +/- 0.00800001621246338
Measured from: -0.0199999809265137
to: 0.427999973297119 [s; relative to TRIGTIME]
T50: 0.228000044822693 +/- 0.00565686571406321
Measured from: 0.0720000267028809
to: 0.300000071525574 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.28600001335144
to: 0.71399998664856 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0720000267028809
to: 0.495999932289124 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.003393 6.824287 1.317510 0.036450
0.057742 0.056429 0.025620 0.006116 [error]
Peak 7.015124 6.819689 1.319570 0.035160
0.058186 0.056802 0.026156 0.007311 [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 3.95e-06 2.38e-06 9.16e-07 4.72e-07 7.49e-06 7.72e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 1.30e+02 4.57e+01 9.17e+00 2.18e+00 1.86e+02 1.87e+02 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL 2.43e-06 3.04e-06 1.04e-06 5.92e-08 6.57e-06 6.57e-06 erg/cm2
Error 1.34e-07 6.74e-08 3.40e-08 9.74e-09 1.70e-07 1.71e-07 erg/cm2
Peak flux Cutoff-PL 7.84e+01 5.62e+01 1.04e+01 3.26e-01 1.45e+02 1.45e+02 ph/cm2/s
Error 4.58e+00 1.26e+00 3.25e-01 5.41e-02 5.10e+00 5.11e+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 3.377 0.000 - - 9.02e-01 0.00e+00 969.110 57
CPL 0.332 0.234 25.2 1.6 3.70e+01 1.07e+01 48.100 56
The chi2 of BB fit is 201.91 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 3.317 0.000 - - 5.32e-01 0.00e+00 847.560 57
CPL 0.341 0.240 25.2 1.6 2.07e+01 6.23e+00 46.850 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: 0.448000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.568 -0.072 0.496
T90 0.448 -0.020 0.428
T50 0.228 0.072 0.300
Peak 1.000 -0.286 0.714
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.1552 -20.4194 0.0026 30.5 -154.0 15.6800 72.7 TRIG_01159327
------------------------------------------
Foreground time interval of the image:
-0.072 0.496 (delta_t = 0.568 [sec])
Background time interval of the image:
-218.231 -0.072 (delta_t = 218.159 [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 -0.072 sec. to 0.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.37684 ( )
Norm@50keV : 0.901915 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 969.11 using 59 PHA bins.
# Reduced chi-squared = 17.002 for 57 degrees of freedom
# Null hypothesis probability = 4.710922e-166
Photon flux (15-150 keV) in 0.568 sec: 330.491 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49112e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.072 sec. to 0.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.331974 ( -0.238754 0.228358 )
Epeak [keV] : 25.2081 ( -1.67934 1.50871 )
Norm@50keV : 37.0102 ( -8.96074 12.5033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.10 using 59 PHA bins.
# Reduced chi-squared = 0.8589 for 56 degrees of freedom
# Null hypothesis probability = 7.645901e-01
Photon flux (15-150 keV) in 0.568 sec: 255.692 ( -8.869 8.978 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56801e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.072 sec. to 0.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.276359 ( -0.303184 0.364037 )
beta : -5.93410 ( -1.54098 0.531238 )
Epeak [keV] : 25.3665 ( -1.72526 1.56531 )
Norm@50keV : 40.3197 ( -19.1649 25.0783 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.28 using 59 PHA bins.
# Reduced chi-squared = 0.8233 for 55 degrees of freedom
# Null hypothesis probability = 8.220041e-01
Photon flux (15-150 keV) in 0.568 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] : 8.39504 ( )
R^2/D10^2 : 222.391 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 201.91 using 59 PHA bins.
# Reduced chi-squared = 3.5422 for 57 degrees of freedom
# Null hypothesis probability = 4.438634e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.665e-06 5.907e-08
25- 50 3.162e-06 6.589e-08
50-150 9.707e-07 3.294e-08
15-150 5.798e-06 1.272e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.6688 ( )
Norm : 2946.25 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.954e-06 9.145e-08
25- 50 2.921e-06 5.907e-08
50-150 1.145e-06 3.607e-08
15-150 7.020e-06 1.505e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.24309 (-0.530867 0.480812)
R1^2/D10^2 : 594.650 (-122.857 192.994)
kT2 [keV] : 11.6812 (-0.895984 1.17084)
R2^2/D10^2 : 21.9234 (-11.0435 17.5255)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.206e-06 1.673e-07
25- 50 3.099e-06 1.548e-07
50-150 1.096e-06 1.380e-07
15-150 6.401e-06 3.948e-07
Peak spectrum fit
Power-law model
Time interval is from -0.286 sec. to 0.714 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.31669 ( )
Norm@50keV : 0.531823 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 847.56 using 59 PHA bins.
# Reduced chi-squared = 14.869 for 57 degrees of freedom
# Null hypothesis probability = 2.963120e-141
Photon flux (15-150 keV) in 1 sec: 185.836 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.51459e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.286 sec. to 0.714 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.341120 ( -0.245592 0.234914 )
Epeak [keV] : 25.1766 ( -1.72216 1.53851 )
Norm@50keV : 20.7370 ( -5.17249 7.28609 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.85 using 59 PHA bins.
# Reduced chi-squared = 0.8365 for 56 degrees of freedom
# Null hypothesis probability = 8.032477e-01
Photon flux (15-150 keV) in 1 sec: 145.278 ( -5.072 5.135 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.57102e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.286 sec. to 0.714 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.303186 ( -0.320288 0.417825 )
beta : -5.66854 ( -1.07391 0.510911 )
Epeak [keV] : 25.2138 ( -1.7351 1.51579 )
Norm@50keV : 22.1348 ( -12.0319 15.9867 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.40 using 59 PHA bins.
# Reduced chi-squared = 0.7890 for 55 degrees of freedom
# Null hypothesis probability = 8.709044e-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] : 8.37680 ( )
R^2/D10^2 : 127.628 ( )
(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 1.672e-06 6.350e-08
25- 50 3.165e-06 6.750e-08
50-150 9.648e-07 3.390e-08
15-150 5.802e-06 1.165e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.8665 (-0.551446 0.565617)
Norm : 1653.66 (-70.9787 74.0575)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.936e-06 9.250e-08
25- 50 2.919e-06 6.100e-08
50-150 1.159e-06 4.000e-08
15-150 7.014e-06 1.365e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.24469 (-0.548604 0.492943)
R1^2/D10^2 : 338.891 (-71.149 113.212)
kT2 [keV] : 11.7488 (-0.95963 1.29023)
R2^2/D10^2 : 12.0878 (-6.39359 10.409)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.208e-06 1.505e-07
25- 50 3.097e-06 1.850e-07
50-150 1.101e-06 1.403e-07
15-150 6.406e-06 4.470e-07
Plot creation:
Sat Mar 11 14:26:10 EST 2023