batgrbproduct analysis for trigger=1143281
batgrbproduct Analysis for Trigger=1143281
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 Dec 5 15:57:13 EST 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1143281/GCN5_download_cron
======================================================================
Trigger: 01143281 Segment: 000
BAT Trigger Time: 691843536 [s; MET]
Trigger Stop: 691843600 [s; MET]
UTC: 2022-12-04T10:45:05.667180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.528603521558 Dec: 35.0051352734535 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.88
Flight Position: [ source = BAT ]
RA: 299.528603521558 Dec: 35.0051352734535 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.558463091143 Dec: 35.0830937531613 [deg; J2000]
{ 19h 58m 14.0s , +35d 04' 59.1" }
+/- 1.96667043860309 [arcmin] (estimated 90% radius based on SNR)
+/- 0.900450476370348 [arcmin] (formal 1-sigma fit error)
SNR: 11.5744889068378
Angular difference between Flight and Ground position is 4.902095 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 458.452000021935 +/- 55.8676389554337
Measured from: -129.183999896049
to: 329.268000125885 [s; relative to TRIGTIME]
T50: 222.463999986649 +/- 63.9288376914239
Measured from: -3.93599987030029
to: 218.528000116348 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 54.8880000114441
to: 55.8880000114441 [s; relative to TRIGTIME]
Total Fluence
Measured from: -148.692000031471
to: 345.863999962807 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.157592 3.909747 1.628451 0.651459
0.200984 0.204580 0.177952 0.164195 [error]
Peak 0.042635 0.015500 0.023942 0.014794
0.010209 0.010476 0.009313 0.008357 [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 1.47e-06 1.68e-06 1.37e-06 1.87e-06 5.21e-06 6.40e-06 erg/cm2
Error 1.39e-07 1.08e-07 1.71e-07 4.62e-07 3.81e-07 6.52e-07 erg/cm2
Peak flux Power-law 2.23e-01 2.21e-01 1.54e-01 1.70e-01 6.66e-01 7.69e-01 ph/cm2/s
Error 2.06e-01 9.96e-02 8.14e-02 2.26e-01 2.60e-01 2.88e-01 ph/cm2/s
Fluence Cutoff-PL 1.47e-06 1.69e-06 1.37e-06 1.72e-06 5.18e-06 6.24e-06 erg/cm2
Error 1.48e-07 1.28e-07 1.83e-07 9.73e-07 4.43e-07 1.03e-06 erg/cm2
Peak flux Cutoff-PL 2.66e-01 2.28e-01 1.36e-01 1.31e-01 6.79e-01 7.66e-01 ph/cm2/s
Error 2.10e-01 1.02e-01 8.47e-02 2.46e-01 2.69e-01 3.01e-01 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 2.292 0.138 - - 1.10e-03 9.73e-05 33.510 57
CPL 1.988 0.000 1.6 11.9 1.65e-03 0.00e+00 34.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.520 0.963 - - 5.30e-03 2.17e-03 49.340 57
CPL 4.005 1.766 473.6 0.0 4.50e-04 0.00e+00 47.450 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 494.556 -148.692 345.864
T90 458.452 -129.184 329.268
T50 222.464 -3.936 218.528
Peak 1.000 54.888 55.888
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.5585 +35.0831 0.0167 37.3 -171.0 5.8591 11.6 TRIG_01143281
------------------------------------------
Foreground time interval of the image:
-143.999 70.201 (delta_t = 214.200 [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
Time interval is from -148.692 sec. to 345.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29216 ( -0.135057 0.140435 )
Norm@50keV : 1.10299E-03 ( -9.81406e-05 9.65568e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.51 using 59 PHA bins.
# Reduced chi-squared = 0.5880 for 57 degrees of freedom
# Null hypothesis probability = 9.944561e-01
Photon flux (15-150 keV) in 494.6 sec: 0.191920 ( -0.012459 0.0124887 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.20576e-06 ( -3.7821e-07 3.83077e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -148.692 sec. to 345.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98827 ( -1.98827 -1.98827 )
Epeak [keV] : 1.57907 ( -0.528476 23.2031 )
Norm@50keV : 1.65168E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.17 using 59 PHA bins.
# Reduced chi-squared = 0.6101 for 56 degrees of freedom
# Null hypothesis probability = 9.906304e-01
Photon flux (15-150 keV) in 494.6 sec: 0.191450 ( -0.013447 0.012836 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18168e-06 ( -4.82903e-07 4.02456e-07 ) ergs/cm2
Band function
Time interval is from -148.692 sec. to 345.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.425276 ( 1.30619 1.30619 )
beta : -2.37307 ( 2.37773 0.19113 )
Epeak [keV] : 21.1945 ( -19.9347 7.7303 )
Norm@50keV : 2.70228E-02 ( -0.0267541 449.31 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.36 using 59 PHA bins.
# Reduced chi-squared = 0.5884 for 55 degrees of freedom
# Null hypothesis probability = 9.935976e-01
Photon flux (15-150 keV) in 494.6 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] : 8.36150 (-0.66179 0.720146)
R^2/D10^2 : 0.165292 (-0.0474775 0.0671274)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.50 using 59 PHA bins.
# Reduced chi-squared = 1.553 for 57 degrees of freedom
# Null hypothesis probability = 4.740117e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.066e-06 1.222e-07
25- 50 2.012e-06 1.669e-07
50-150 6.096e-07 1.305e-07
15-150 3.687e-06 2.787e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.0135 (-7.40857 9.60996)
Norm : 1.13747 (-0.148583 0.177445)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.331e-06 1.222e-07
25- 50 1.822e-06 1.286e-07
50-150 1.560e-06 3.099e-07
15-150 4.713e-06 3.722e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.51928 (-0.955808 1.02248)
R1^2/D10^2 : 0.729124 (-0.339682 0.776843)
kT2 [keV] : 20.0777 (-5.23545 11.02)
R2^2/D10^2 : 3.26040E-03 (-0.00250292 0.00781613)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.407e-06 2.649e-07
25- 50 1.685e-06 3.569e-07
50-150 1.936e-06 1.026e-06
15-150 5.028e-06 1.394e-06
Peak spectrum fit
Power-law model
Time interval is from 54.888 sec. to 55.888 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52033 ( -0.945828 0.980233 )
Norm@50keV : 5.30487E-03 ( -0.0023289 0.00200278 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.34 using 59 PHA bins.
# Reduced chi-squared = 0.8656 for 57 degrees of freedom
# Null hypothesis probability = 7.546846e-01
Photon flux (15-150 keV) in 1 sec: 0.666032 ( -0.256934 0.262234 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.01449e-08 ( -2.17795e-08 2.15152e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 54.888 sec. to 55.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.00543 ( -2.99396 0.538617 )
Epeak [keV] : 473.627 ( )
Norm@50keV : 4.49608E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.45 using 59 PHA bins.
# Reduced chi-squared = 0.8474 for 56 degrees of freedom
# Null hypothesis probability = 7.849495e-01
Photon flux (15-150 keV) in 1 sec: 0.679353 0.666736 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.87468e-08 ( -2.01069e-08 2.30576e-08 ) ergs/cm2
Band function
Time interval is from 54.888 sec. to 55.888 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22558 ( 1.22596 1.22596 )
beta : -1.51916 ( 1.52124 0.945721 )
Epeak [keV] : 26.9054 ( -26.9718 -26.9718 )
Norm@50keV : 1.13482E-02 ( -0.0113655 0.257867 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.34 using 59 PHA bins.
# Reduced chi-squared = 0.8971 for 55 degrees of freedom
# Null hypothesis probability = 6.898294e-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] : 22.8318 (-18.7333 -23.1865)
R^2/D10^2 : 1.62298E-02 (-0.0149291 24.2106)
(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 1.085e-08 6.850e-09
25- 50 6.387e-09 4.077e-09
50-150 2.115e-10 2.745e-10
15-150 1.745e-08 1.081e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-199.362 -199.362)
Norm : 2.67625 (-1.0138 1.0157)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.664e-09 4.250e-09
25- 50 1.282e-08 8.135e-09
50-150 2.812e-08 1.747e-08
15-150 4.760e-08 3.047e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.10863 (-1.80191 2.02839)
R1^2/D10^2 : 10.2971 (-9.70773 253.971)
kT2 [keV] : 83.8990 (-65.0978 -86.1306)
R2^2/D10^2 : 5.51279E-04 (-0.000450719 0.0184798)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.092e-08 6.935e-09
25- 50 6.327e-09 3.623e-09
50-150 3.923e-08 2.485e-08
15-150 5.648e-08 3.058e-08
Plot creation:
Mon Dec 5 16:01:02 EST 2022