batgrbproduct analysis for trigger=1152509
batgrbproduct Analysis for Trigger=1152509
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): Sun Feb 5 12:17:09 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1152509/GCN5_download_cron
======================================================================
Trigger: 01152509 Segment: 000
BAT Trigger Time: 697172248 [s; MET]
Trigger Stop: 697172312 [s; MET]
UTC: 2023-02-04T02:56:57.304260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 238.16447566395 Dec: -50.8579554299044 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.78
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.78
Flight Position: [ source = BAT ]
RA: 238.16447566395 Dec: -50.8579554299044 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 238.165741529951 Dec: -50.8479983071546 [deg; J2000]
{ 15h 52m 39.8s , -50d 50' 52.8" }
+/- 2.42438130448197 [arcmin] (estimated 90% radius based on SNR)
+/- 1.36199316685874 [arcmin] (formal 1-sigma fit error)
SNR: 8.58397581322514
Angular difference between Flight and Ground position is 0.599348 arcmin
Partial Coding Fraction: 0.4882812 [ including projection effects ]
Duration
T90: 182.048000097275 +/- 16.7342808965704
Measured from: -0.791999936103821
to: 181.256000161171 [s; relative to TRIGTIME]
T50: 101.37600004673 +/- 14.6298894554681
Measured from: 52.9200000762939
to: 154.296000123024 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 148.12399995327
to: 149.12399995327 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.80799996852875
to: 195.62399995327 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.959700 2.464364 1.608001 0.283877
0.170773 0.160279 0.135468 0.113254 [error]
Peak 0.024353 0.044844 0.042274 0.019939
0.010767 0.010077 0.008795 0.007443 [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 6.33e-07 1.02e-06 1.24e-06 2.94e-06 3.73e-06 5.83e-06 erg/cm2
Error 7.71e-08 7.70e-08 1.33e-07 6.63e-07 3.13e-07 7.77e-07 erg/cm2
Peak flux Power-law 1.99e-01 2.70e-01 2.71e-01 4.89e-01 8.98e-01 1.23e+00 ph/cm2/s
Error 1.21e-01 9.69e-02 6.74e-02 3.15e-01 2.40e-01 3.17e-01 ph/cm2/s
Fluence Cutoff-PL 5.93e-07 1.07e-06 1.25e-06 1.44e-06 3.57e-06 4.35e-06 erg/cm2
Error 8.96e-08 7.37e-08 1.43e-07 1.25e-06 3.57e-07 1.40e-06 erg/cm2
Peak flux Cutoff-PL 2.10e-01 2.77e-01 2.68e-01 4.64e-01 9.07e-01 1.21e+00 ph/cm2/s
Error -------- 9.76e-02 -------- -------- 2.41e-01 3.54e-01 ph/cm2/s
Fluence Band 5.79e-07 1.08e-06 1.21e-06 2.23e-06 3.60e-06 5.12e-06 erg/cm2
Error 7.07e-08 -------- -------- -------- -------- -------- 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 1.720 0.135 - - 1.99e-03 1.59e-04 38.080 57
CPL 1.256 0.555 75.1 -27.2 3.51e-03 2.63e-03 35.800 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.998 0.521 - - 7.80e-03 2.04e-03 51.310 57
CPL 1.016 0.611 9999.4 0.0 7.88e-03 6.49e-03 51.340 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: 179.200000 sec.
T50 in the 50-300 keV band: 99.200000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 202.432 -6.808 195.624
T90 182.048 -0.792 181.256
T50 101.376 52.920 154.296
Peak 1.000 148.124 149.124
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
238.1657 -50.8480 0.0223 26.1 -67.8 2.1584 8.6 TRIG_01152509
------------------------------------------
Foreground time interval of the image:
-6.808 71.301 (delta_t = 78.109 [sec])
Background time interval of the image:
-239.000 -6.808 (delta_t = 232.192 [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 -6.808 sec. to 195.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71991 ( -0.133658 0.135747 )
Norm@50keV : 1.99236E-03 ( -0.00015996 0.00015858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.08 using 59 PHA bins.
# Reduced chi-squared = 0.6680 for 57 degrees of freedom
# Null hypothesis probability = 9.746231e-01
Photon flux (15-150 keV) in 202.4 sec: 0.266474 ( -0.0203177 0.0203517 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.72799e-06 ( -3.11111e-07 3.1421e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.808 sec. to 195.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25579 ( -0.598856 0.51163 )
Epeak [keV] : 75.1097 ( -20.7231 -75.1098 )
Norm@50keV : 3.50913E-03 ( -0.00157783 0.00368193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.80 using 59 PHA bins.
# Reduced chi-squared = 0.6392 for 56 degrees of freedom
# Null hypothesis probability = 9.837588e-01
Photon flux (15-150 keV) in 202.4 sec: 0.260299 ( -0.021487 0.021467 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.57495e-06 ( -3.55597e-07 3.58086e-07 ) ergs/cm2
Band function
Time interval is from -6.808 sec. to 195.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.946634 ( 1.02897 1.02897 )
beta : -1.97752 ( 1.98338 0.325265 )
Epeak [keV] : 55.1107 ( -55.1163 -55.1163 )
Norm@50keV : 5.54200E-03 ( -0.00555547 122.566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.57 using 59 PHA bins.
# Reduced chi-squared = 0.6468 for 55 degrees of freedom
# Null hypothesis probability = 9.805258e-01
Photon flux (15-150 keV) in 202.4 sec: 0.260013 ( 6.73999 -0.021474 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59744e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.6312 (-1.15261 1.29223)
R^2/D10^2 : 5.27210E-02 (-0.0159349 0.0224777)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.13 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 57 degrees of freedom
# Null hypothesis probability = 9.875484e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.610e-07 4.868e-08
25- 50 1.205e-06 1.110e-07
50-150 1.195e-06 2.040e-07
15-150 2.761e-06 2.530e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 125.651 (-35.1642 54.5524)
Norm : 1.11767 (-0.102716 0.130977)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.880e-07 6.254e-08
25- 50 1.060e-06 1.188e-07
50-150 1.935e-06 7.385e-07
15-150 3.583e-06 8.268e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.74590 (-1.68781 1.8444)
R1^2/D10^2 : 0.342510 (-0.185648 0.595405)
kT2 [keV] : 22.8707 (-5.21276 11.0223)
R2^2/D10^2 : 4.44925E-03 (-0.00341031 0.0081399)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.725e-07 1.732e-07
25- 50 1.083e-06 2.957e-07
50-150 1.899e-06 9.571e-07
15-150 3.554e-06 1.186e-06
Peak spectrum fit
Power-law model
Time interval is from 148.124 sec. to 149.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.998407 ( -0.559035 0.482114 )
Norm@50keV : 7.79962E-03 ( -0.0021078 0.00197222 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.31 using 59 PHA bins.
# Reduced chi-squared = 0.9002 for 57 degrees of freedom
# Null hypothesis probability = 6.873579e-01
Photon flux (15-150 keV) in 1 sec: 0.898124 ( -0.238646 0.24096 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.43895e-08 ( -2.12013e-08 2.13107e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 148.124 sec. to 149.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01629 ( -0.758355 0.46411 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 7.87774E-03 ( -0.00188261 0.0110997 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.34 using 59 PHA bins.
# Reduced chi-squared = 0.9167 for 56 degrees of freedom
# Null hypothesis probability = 6.517965e-01
Photon flux (15-150 keV) in 1 sec: 0.907441 ( -0.249481 0.232509 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.45647e-08 ( -2.12925e-08 2.04153e-08 ) ergs/cm2
Band function
Time interval is from 148.124 sec. to 149.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.850010 ( 0.850041 0.850041 )
beta : -0.998341 ( 0.998298 0.559012 )
Epeak [keV] : 37.6893 ( -37.6147 -37.6147 )
Norm@50keV : 1.27829E-02 ( -0.00687019 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.31 using 59 PHA bins.
# Reduced chi-squared = 0.9330 for 55 degrees of freedom
# Null hypothesis probability = 6.162630e-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] : 27.3711 (-10.4608 26.8796)
R^2/D10^2 : 1.54036E-02 (-0.0151011 0.0533313)
(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 1.907e-09 1.194e-09
25- 50 1.130e-08 6.960e-09
50-150 6.164e-08 3.604e-08
15-150 7.485e-08 4.509e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-79.7534 -200)
Norm : 3.85757 (-0.968272 0.968272)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.606e-09 5.735e-09
25- 50 1.848e-08 1.061e-08
50-150 4.053e-08 2.461e-08
15-150 6.861e-08 4.035e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.65056 (-4.29416 6.72531)
R1^2/D10^2 : 0.342308 (-0.257671 1.06207)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 2.12540E-04 (-7.69549e-05 0.000509133)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.075e-09 4.457e-09
25- 50 1.669e-08 9.315e-09
50-150 6.209e-08 3.665e-08
15-150 8.585e-08 4.468e-08
Plot creation:
Sun Feb 5 12:20:20 EST 2023