batgrbproduct analysis for trigger=1144698
batgrbproduct Analysis for Trigger=1144698
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 Jan 6 15:34:26 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1144698/GCN5_download_cron
======================================================================
Trigger: 01144698 Segment: 000
BAT Trigger Time: 692882511.36 [s; MET]
Trigger Stop: 692882512.384 [s; MET]
UTC: 2022-12-16T11:21:20.956420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 326.020902229861 Dec: -34.4050890625163 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.84
Image Trigger?: NO
Rate S/N Ratio: 17.832554500127 [ if not an image trigger ]
Image S/N Ratio: 9.84
Flight Position: [ source = BAT ]
RA: 326.020902229861 Dec: -34.4050890625163 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 326.023162918834 Dec: -34.3937088630013 [deg; J2000]
{ 21h 44m 05.6s , -34d 23' 37.4" }
+/- 1.30578619263614 [arcmin] (estimated 90% radius based on SNR)
+/- 0.422418775258554 [arcmin] (formal 1-sigma fit error)
SNR: 20.7771917793317
Angular difference between Flight and Ground position is 0.691924 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 174.483999967575 +/- 5.25771208181308
Measured from: -3.92399990558624
to: 170.560000061989 [s; relative to TRIGTIME]
T50: 156.796000003815 +/- 3.93280572356897
Measured from: 2.92800009250641
to: 159.724000096321 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.228000044822693
to: 1.22800004482269 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.6800000667572
to: 175.215999960899 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.285582 3.088006 2.149117 0.351722
0.111669 0.116723 0.102120 0.089265 [error]
Peak 0.042942 0.092367 0.071083 0.020801
0.009423 0.010168 0.009293 0.007419 [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 6.89e-07 1.22e-06 1.64e-06 4.58e-06 4.77e-06 8.13e-06 erg/cm2
Error 5.54e-08 5.80e-08 1.02e-07 6.17e-07 2.42e-07 6.91e-07 erg/cm2
Peak flux Power-law 4.51e-01 5.57e-01 4.98e-01 7.73e-01 1.77e+00 2.28e+00 ph/cm2/s
Error 1.07e-01 8.18e-02 7.07e-02 2.29e-01 2.27e-01 3.03e-01 ph/cm2/s
Fluence Cutoff-PL 6.21e-07 1.27e-06 1.69e-06 2.17e-06 4.56e-06 5.76e-06 erg/cm2
Error 6.86e-08 6.91e-08 1.11e-07 1.00e-06 2.75e-07 1.03e-06 erg/cm2
Peak flux Cutoff-PL 3.92e-01 5.80e-01 5.35e-01 4.43e-01 1.74e+00 1.95e+00 ph/cm2/s
Error 1.33e-01 9.27e-02 8.93e-02 3.65e-01 2.34e-01 4.41e-01 ph/cm2/s
Fluence Band 6.20e-07 1.26e-06 1.69e-06 2.35e-06 4.58e-06 5.94e-06 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 1.565 0.084 - - 2.76e-03 1.29e-04 44.550 57
CPL 1.023 0.361 91.0 44.0 5.12e-03 2.15e-03 37.140 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.159 0.210 - - 1.52e-02 1.90e-03 43.520 57
CPL 0.561 0.869 134.3 0.0 2.87e-02 0.00e+00 42.120 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: 177.728000 sec.
T50 in the 50-300 keV band: 151.552000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 184.896 -9.680 175.216
T90 174.484 -3.924 170.560
T50 156.796 2.928 159.724
Peak 1.000 0.228 1.228
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
326.0232 -34.3937 0.0093 15.7 -18.2 2.0738 20.8 TRIG_01144698
------------------------------------------
Foreground time interval of the image:
-9.680 11.041 (delta_t = 20.721 [sec])
Background time interval of the image:
-60.360 -52.450 (delta_t = 7.910 [sec])
-51.360 -51.070 (delta_t = 0.290 [sec])
-50.360 -49.050 (delta_t = 1.310 [sec])
-48.360 -44.500 (delta_t = 3.860 [sec])
-34.360 -21.150 (delta_t = 13.210 [sec])
-20.360 -18.457 (delta_t = 1.903 [sec])
-17.360 -16.000 (delta_t = 1.360 [sec])
-15.360 -9.680 (delta_t = 5.680 [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
Multiple GTIs in the spectrum
tstart tstop
-9.680000 59.300000
60.640000 175.216000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56486 ( -0.0833641 0.0839514 )
Norm@50keV : 2.76404E-03 ( -0.00012898 0.000128628 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.55 using 59 PHA bins.
# Reduced chi-squared = 0.7817 for 57 degrees of freedom
# Null hypothesis probability = 8.848461e-01
Photon flux (15-150 keV) in 183.6 sec: 0.351435 ( -0.0164533 0.0164816 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76756e-06 ( -2.4107e-07 2.424e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-9.680000 59.300000
60.640000 175.216000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02338 ( -0.375968 0.34663 )
Epeak [keV] : 90.9999 ( -18.7667 69.2969 )
Norm@50keV : 5.11960E-03 ( -0.00163442 0.00265681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.14 using 59 PHA bins.
# Reduced chi-squared = 0.6632 for 56 degrees of freedom
# Null hypothesis probability = 9.755093e-01
Photon flux (15-150 keV) in 183.6 sec: 0.339796 ( -0.017913 0.017941 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.55998e-06 ( -2.74152e-07 2.75253e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-9.680000 59.300000
60.640000 175.216000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02366 ( -0.192451 0.370739 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 91.0047 ( -13.7829 69.2631 )
Norm@50keV : 5.11760E-03 ( -0.00163302 0.00265987 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.14 using 59 PHA bins.
# Reduced chi-squared = 0.6753 for 55 degrees of freedom
# Null hypothesis probability = 9.690457e-01
Photon flux (15-150 keV) in 183.6 sec: 0.339657 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.58471e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.8706 (-0.82675 0.883921)
R^2/D10^2 : 3.98980E-02 (-0.00740604 0.00900718)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.98 using 59 PHA bins.
# Reduced chi-squared = 1.9821 for 57 degrees of freedom
# Null hypothesis probability = 1.461445e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.396e-07 3.002e-08
25- 50 1.339e-06 7.987e-08
50-150 2.007e-06 1.983e-07
15-150 3.685e-06 2.020e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 195.939 (-45.6429 -195.212)
Norm : 1.42643 (-0.0662712 0.0724323)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.517e-07 4.021e-08
25- 50 1.253e-06 9.088e-08
50-150 2.744e-06 7.130e-07
15-150 4.648e-06 8.877e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.69744 (-1.23436 1.49413)
R1^2/D10^2 : 0.651820 (-0.363132 1.09492)
kT2 [keV] : 20.7089 (-2.31585 3.41043)
R2^2/D10^2 : 1.04658E-02 (-0.00474802 0.0062084)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.340e-07 1.651e-07
25- 50 1.222e-06 1.631e-07
50-150 2.579e-06 3.617e-07
15-150 4.435e-06 5.159e-07
Peak spectrum fit
Power-law model
Time interval is from 0.228 sec. to 1.228 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15890 ( -0.211272 0.208552 )
Norm@50keV : 1.51896E-02 ( -0.00189767 0.00189714 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.52 using 59 PHA bins.
# Reduced chi-squared = 0.7636 for 57 degrees of freedom
# Null hypothesis probability = 9.056397e-01
Photon flux (15-150 keV) in 1 sec: 1.77332 ( -0.227202 0.227622 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55953e-07 ( -2.13986e-08 2.15385e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.228 sec. to 1.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.561029 ( -1.0441 0.69335 )
Epeak [keV] : 134.265 ( )
Norm@50keV : 2.86661E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.12 using 59 PHA bins.
# Reduced chi-squared = 0.7521 for 56 degrees of freedom
# Null hypothesis probability = 9.154042e-01
Photon flux (15-150 keV) in 1 sec: 1.73727 ( -0.23486 0.23362 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52087e-07 ( -2.2797e-08 2.2562e-08 ) ergs/cm2
Band function
Time interval is from 0.228 sec. to 1.228 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.596499 ( -0.378275 0.822407 )
beta : -9.37127 ( 9.37164 19.3716 )
Epeak [keV] : 139.561 ( -42.5536 287.045 )
Norm@50keV : 2.75803E-02 ( -0.00989927 0.0121291 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.12 using 59 PHA bins.
# Reduced chi-squared = 0.7658 for 55 degrees of freedom
# Null hypothesis probability = 8.987563e-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] : 19.4847 (-2.91137 3.57536)
R^2/D10^2 : 9.22197E-02 (-0.0390337 0.0647162)
(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 6.818e-09 1.821e-09
25- 50 3.337e-08 6.020e-09
50-150 9.354e-08 1.959e-08
15-150 1.337e-07 2.452e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-35.0363 -200)
Norm : 7.29775 (-0.935307 0.935307)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.817e-08 1.026e-08
25- 50 3.495e-08 1.925e-08
50-150 7.665e-08 4.287e-08
15-150 1.298e-07 7.160e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.81343 (-8.83961 -9.94687)
R1^2/D10^2 : 0.444165 (-0.301709 0.101609)
kT2 [keV] : 31.3867 (-13.6736 -32.1474)
R2^2/D10^2 : 1.46898E-02 (-0.0128726 0.095429)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.245e-08 5.196e-09
25- 50 2.986e-08 7.835e-09
50-150 1.004e-07 2.454e-08
15-150 1.427e-07 3.201e-08
Plot creation:
Fri Jan 6 15:41:03 EST 2023