batgrbproduct analysis for trigger=1159435
batgrbproduct Analysis for Trigger=1159435
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 Mar 12 20:58:31 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1159435/GCN5_download_cron
======================================================================
Trigger: 01159435 Segment: 000
BAT Trigger Time: 700255928 [s; MET]
Trigger Stop: 700255992 [s; MET]
UTC: 2023-03-11T19:31:37.094240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.044303078593 Dec: -15.9129605387498 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 23.72
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 23.72
Flight Position: [ source = BAT ]
RA: 245.044303078593 Dec: -15.9129605387498 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.906965508808 Dec: -16.0148930236469 [deg; J2000]
{ 16h 19m 37.7s , -16d 00' 53.6" }
+/- 4.03257363055443 [arcmin] (estimated 90% radius based on SNR)
+/- 2.73467662908641 [arcmin] (formal 1-sigma fit error)
SNR: 4.14954807140606
Angular difference between Flight and Ground position is 10.008513 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 405.427999854088 +/- 29.7030402516368
Measured from: 54.700000166893
to: 460.128000020981 [s; relative to TRIGTIME]
T50: 148.439999938011 +/- 15.3673763935014
Measured from: 116.604000091553
to: 265.044000029564 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 158.715999960899
to: 159.715999960899 [s; relative to TRIGTIME]
Total Fluence
Measured from: -205.047999978065
to: 559.031999945641 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 60.263206 4.792170 -0.118269 -0.155846
0.253334 0.202674 0.164620 0.137469 [error]
Peak 0.134867 0.018545 0.010053 0.008181
0.010557 0.007647 0.006301 0.005203 [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 1.97e-05 1.84e-06 6.87e-08 2.66e-09 2.16e-05 2.16e-05 erg/cm2
Error 1.39e-06 1.18e-07 1.27e-08 8.58e-10 1.37e-06 1.37e-06 erg/cm2
Peak flux Power-law 1.33e+00 1.80e-01 1.08e-02 6.86e-04 1.53e+00 1.53e+00 ph/cm2/s
Error 2.14e-01 7.03e-02 1.02e-02 1.30e-03 2.37e-01 2.37e-01 ph/cm2/s
Fluence Cutoff-PL 1.79e-05 1.58e-06 2.27e-09 3.34e-15 1.95e-05 1.95e-05 erg/cm2
Error 1.69e-06 1.35e-07 3.32e-09 1.24e-13 1.70e-06 1.70e-06 erg/cm2
Peak flux Cutoff-PL 1.33e+00 1.80e-01 1.08e-02 6.63e-04 1.52e+00 1.53e+00 ph/cm2/s
Error -------- -------- -------- -------- -------- 2.43e-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 6.744 0.190 - - 1.23e-04 1.84e-05 101.400 57
CPL 1.000 0.000 50.0 0.0 1.70e-03 0.00e+00 1224.530 56
The chi2 of BB fit is 69.35 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 5.060 0.758 - - 9.34e-04 7.11e-04 45.930 57
CPL 1.000 0.000 50.0 0.0 1.55e-02 0.00e+00 118.170 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 764.080 -205.048 559.032
T90 405.428 54.700 460.128
T50 148.440 116.604 265.044
Peak 1.000 158.716 159.716
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9070 -16.0149 0.0465 0.2 45.2 6.9949 4.1 TRIG_01159435
------------------------------------------
Foreground time interval of the image:
-205.048 -205.000 (delta_t = 0.048 [sec])
-204.000 -160.760 (delta_t = 43.240 [sec])
-160.000 -84.610 (delta_t = 75.390 [sec])
-77.000 -70.550 (delta_t = 6.450 [sec])
-64.000 -55.160 (delta_t = 8.840 [sec])
-36.000 -29.820 (delta_t = 6.180 [sec])
-24.000 -23.950 (delta_t = 0.050 [sec])
-23.000 123.320 (delta_t = 146.320 [sec])
127.000 128.550 (delta_t = 1.550 [sec])
130.000 143.100 (delta_t = 13.100 [sec])
144.000 215.500 (delta_t = 71.500 [sec])
217.000 337.010 (delta_t = 120.010 [sec])
346.000 346.503 (delta_t = 0.503 [sec])
349.000 398.134 (delta_t = 49.133 [sec])
409.000 409.666 (delta_t = 0.666 [sec])
411.000 558.020 (delta_t = 147.020 [sec])
559.000 559.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-239.000 -205.048 (delta_t = 33.952 [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
-205.048000 -205.000000
-204.000000 -160.760000
-160.000000 -84.610000
-77.000000 -70.550000
-64.000000 -55.160000
-36.000000 -29.820000
-24.000000 -23.950000
-23.000000 123.320000
127.000000 128.550000
130.000000 143.100000
144.000000 215.500000
217.000000 337.010000
346.000000 346.502700
349.000000 398.133500
409.000000 409.666300
411.000000 558.020000
559.000000 559.032000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.74379 ( -0.191571 0.188617 )
Norm@50keV : 1.22572E-04 ( -1.723e-05 1.96107e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 101.40 using 59 PHA bins.
# Reduced chi-squared = 1.7789 for 57 degrees of freedom
# Null hypothesis probability = 2.701179e-04
Photon flux (15-150 keV) in 690 sec: 1.07518 ( -0.0733581 0.0744446 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15848e-05 ( -1.3632e-06 1.38139e-06 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-205.048000 -205.000000
-204.000000 -160.760000
-160.000000 -84.610000
-77.000000 -70.550000
-64.000000 -55.160000
-36.000000 -29.820000
-24.000000 -23.950000
-23.000000 123.320000
127.000000 128.550000
130.000000 143.100000
144.000000 215.500000
217.000000 337.010000
346.000000 346.502700
349.000000 398.133500
409.000000 409.666300
411.000000 558.020000
559.000000 559.032000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.69970E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1224.53 using 59 PHA bins.
# Reduced chi-squared = 21.8666 for 56 degrees of freedom
# Null hypothesis probability = 2.123307e-219
Photon flux (15-150 keV) in 690 sec: 0.960155 ( -0.092411 0.090925 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95095e-05 ( -1.70996e-06 1.68056e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-205.048000 -205.000000
-204.000000 -160.760000
-160.000000 -84.610000
-77.000000 -70.550000
-64.000000 -55.160000
-36.000000 -29.820000
-24.000000 -23.950000
-23.000000 123.320000
127.000000 128.550000
130.000000 143.100000
144.000000 215.500000
217.000000 337.010000
346.000000 346.502700
349.000000 398.133500
409.000000 409.666300
411.000000 558.020000
559.000000 559.032000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.668562 ( -1.56285 0.839933 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 5.01069 ( -0.396848 0.232698 )
Norm@50keV : 7.04095 ( -7.04194 916.905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.54 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 55 degrees of freedom
# Null hypothesis probability = 1.368611e-01
Photon flux (15-150 keV) in 690 sec: 1.11828 ( ) 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] : 2.62347 (-0.0893433 0.0961494)
R^2/D10^2 : 319.220 (-89.2462 121.096)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.35 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.263064e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.703e-05 1.604e-06
25- 50 1.515e-06 1.194e-07
50-150 7.590e-10 2.690e-10
15-150 1.854e-05 1.553e-06
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.30072 (-0.200841 0.221531)
Norm : 406.689 (-96.781 124.158)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.833e-05 1.563e-06
25- 50 1.614e-06 1.301e-07
50-150 3.691e-09 1.159e-09
15-150 1.995e-05 1.594e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.16665 (-2.16566 27.5544)
R1^2/D10^2 : 880.398 (-883.265 -883.265)
kT2 [keV] : 3.10968 (-3.10565 77.2337)
R2^2/D10^2 : 43.2272 (-44.2695 292.671)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.768e-05 6.010e-06
25- 50 1.592e-06 7.555e-07
50-150 1.124e-08 6.235e-09
15-150 1.928e-05 6.362e-06
Peak spectrum fit
Power-law model
Time interval is from 158.716 sec. to 159.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.05959 ( -0.706098 0.809407 )
Norm@50keV : 9.34068E-04 ( -0.000531826 0.000890461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.93 using 59 PHA bins.
# Reduced chi-squared = 0.8057 for 57 degrees of freedom
# Null hypothesis probability = 8.530227e-01
Photon flux (15-150 keV) in 1 sec: 1.52582 ( -0.236663 0.236708 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.86111e-08 ( -8.18368e-09 8.3793e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 158.716 sec. to 159.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.55252E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 118.17 using 59 PHA bins.
# Reduced chi-squared = 2.1101 for 56 degrees of freedom
# Null hypothesis probability = 2.444334e-06
Photon flux (15-150 keV) in 1 sec: 1.52308 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.85259e-08 ( -8.437e-09 8.3437e-09 ) ergs/cm2
Band function
Time interval is from 158.716 sec. to 159.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.87557 ( 3.6124 7.87557 )
beta : -5.15132 ( -0.739319 0.785895 )
Epeak [keV] : 398.589 ( -398.589 -398.589 )
Norm@50keV : 0.115555 ( -0.0647477 0.129493 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.97 using 59 PHA bins.
# Reduced chi-squared = 0.8358 for 55 degrees of freedom
# Null hypothesis probability = 8.020024e-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] : 2.85025 (-0.430083 0.513187)
R^2/D10^2 : 297.148 (-196.727 645.618)
(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 4.013e-08 2.238e-08
25- 50 4.874e-09 2.499e-09
50-150 5.123e-12 5.165e-12
15-150 4.501e-08 2.284e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.63819 (-1.26875 1.78501)
Norm : 230.559 (-130.631 348.289)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.963e-08 1.536e-08
25- 50 6.497e-09 3.322e-09
50-150 5.969e-11 5.846e-11
15-150 4.618e-08 1.783e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.79287 (-0.416626 0.507915)
R1^2/D10^2 : 337.887 (-225.534 665.927)
kT2 [keV] : 100.060 (-74.9829 -99.9983)
R2^2/D10^2 : 2.45023E-04 (-0.000208283 0.00527486)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.704e-08 1.874e-08
25- 50 8.545e-09 4.031e-09
50-150 2.215e-08 1.688e-08
15-150 6.774e-08 3.409e-08
Plot creation:
Sun Mar 12 21:01:55 EDT 2023