batgrbproduct analysis for trigger=1230423
batgrbproduct Analysis for Trigger=1230423
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 May 24 12:06:34 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1230423/GCN5_download_cron
======================================================================
Trigger: 01230423 Segment: 000
BAT Trigger Time: 738168225.408 [s; MET]
Trigger Stop: 738168229.504 [s; MET]
UTC: 2024-05-23T14:43:11.908700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.5671478971774 Dec: -22.0204592880628 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.5
Image Trigger?: NO
Rate S/N Ratio: 8.54400374531753 [ if not an image trigger ]
Image S/N Ratio: 8.5
Flight Position: [ source = BAT ]
RA: 33.5671478971774 Dec: -22.0204592880628 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 33.5369736730104 Dec: -22.0529435482684 [deg; J2000]
{ 02h 14m 08.9s , -22d 03' 10.6" }
+/- 1.61526230463322 [arcmin] (estimated 90% radius based on SNR)
+/- 0.78204780578012 [arcmin] (formal 1-sigma fit error)
SNR: 15.333041002646
Angular difference between Flight and Ground position is 2.571990 arcmin
Partial Coding Fraction: 0.4726562 [ including projection effects ]
Duration
T90: 41.9279999732971 +/- 8.65562120858398
Measured from: -3.92799985408783
to: 38.0000001192093 [s; relative to TRIGTIME]
T50: 24.9279999732971 +/- 5.50600583806198
Measured from: 1.54400014877319
to: 26.4720001220703 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.184000015258789
to: 1.18400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.36800003051758
to: 46.2999999523163 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.761557 0.746356 0.436939 0.004422
0.067805 0.070208 0.059724 0.050893 [error]
Peak 0.034050 0.045550 0.026968 0.004347
0.009663 0.010404 0.008520 0.006940 [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 2.67e-07 3.47e-07 3.30e-07 5.56e-07 1.13e-06 1.50e-06 erg/cm2
Error 3.96e-08 3.52e-08 5.78e-08 1.94e-07 1.33e-07 2.56e-07 erg/cm2
Peak flux Power-law 4.09e-01 3.36e-01 1.86e-01 1.53e-01 9.99e-01 1.08e+00 ph/cm2/s
Error 1.65e-01 8.64e-02 7.10e-02 1.16e-01 2.59e-01 2.76e-01 ph/cm2/s
Fluence Cutoff-PL 2.52e-07 3.66e-07 3.32e-07 2.77e-07 1.09e-06 1.23e-06 erg/cm2
Error 4.62e-08 4.70e-08 6.20e-08 2.98e-07 1.43e-07 3.58e-07 erg/cm2
Peak flux Cutoff-PL 4.09e-01 3.36e-01 1.86e-01 1.51e-01 9.99e-01 1.08e+00 ph/cm2/s
Error 1.64e-01 8.70e-02 7.12e-02 1.46e-01 2.58e-01 2.75e-01 ph/cm2/s
Fluence Band 2.52e-07 3.62e-07 3.34e-07 3.19e-07 1.10e-06 1.27e-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 2.072 0.196 - - 2.31e-03 2.93e-04 64.340 57
CPL 1.609 0.739 38.2 0.0 4.14e-03 0.00e+00 63.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.847 0.493 - - 7.12e-03 2.09e-03 37.400 57
CPL 2.665 0.997 223.6 0.0 2.83e-03 0.00e+00 36.830 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: 13.568000 sec.
T50 in the 50-300 keV band: 8.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 52.668 -6.368 46.300
T90 41.928 -3.928 38.000
T50 24.928 1.544 26.472
Peak 1.000 0.184 1.184
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
33.5370 -22.0529 0.0125 42.6 -5.3 1.7775 15.3 TRIG_01230423
------------------------------------------
Foreground time interval of the image:
-6.368 34.793 (delta_t = 41.161 [sec])
Background time interval of the image:
-239.408 -49.658 (delta_t = 189.750 [sec])
-48.408 -47.288 (delta_t = 1.120 [sec])
-46.408 -6.368 (delta_t = 40.040 [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 -6.368 sec. to 46.300 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07228 ( -0.189931 0.202517 )
Norm@50keV : 2.31209E-03 ( -0.000297384 0.000289509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.34 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.353105e-01
Photon flux (15-150 keV) in 52.67 sec: 0.358853 ( -0.0368524 0.0368935 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1286e-06 ( -1.31694e-07 1.33512e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.368 sec. to 46.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60876 ( -0.884074 0.594428 )
Epeak [keV] : 38.1582 ( )
Norm@50keV : 4.14470E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.26 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.354273e-01
Photon flux (15-150 keV) in 52.67 sec: 0.351801 ( -0.038714 0.038532 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09309e-06 ( -1.4134e-07 1.45216e-07 ) ergs/cm2
Band function
Time interval is from -6.368 sec. to 46.300 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60907 ( 1.741 0.777944 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 38.1448 ( -14.85 -38.1448 )
Norm@50keV : 4.14233E-03 ( -0.00190394 0.00826662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.26 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.076981e-01
Photon flux (15-150 keV) in 52.67 sec: 0.352484 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10444e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.0474 (-1.27957 1.41047)
R^2/D10^2 : 0.112015 (-0.041303 0.0670723)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.73 using 59 PHA bins.
# Reduced chi-squared = 1.486 for 57 degrees of freedom
# Null hypothesis probability = 1.001472e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.506e-07 2.605e-08
25- 50 4.281e-07 6.181e-08
50-150 2.961e-07 7.066e-08
15-150 8.748e-07 1.230e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.2322 (-16.8802 26.191)
Norm : 1.79702 (-0.286339 0.334121)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.408e-07 3.316e-08
25- 50 3.757e-07 4.158e-08
50-150 4.573e-07 1.101e-07
15-150 1.074e-06 1.377e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.11836 (-0.874286 1.24896)
R1^2/D10^2 : 14.6072 (-12.0269 98.8232)
kT2 [keV] : 14.1293 (-2.03493 2.73819)
R2^2/D10^2 : 3.80725E-02 (-0.0198043 0.0333432)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.667e-07 1.142e-07
25- 50 3.474e-07 9.072e-08
50-150 4.189e-07 1.266e-07
15-150 1.033e-06 2.468e-07
Peak spectrum fit
Power-law model
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84740 ( -0.461958 0.523793 )
Norm@50keV : 7.11533E-03 ( -0.00216774 0.00200543 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.40 using 59 PHA bins.
# Reduced chi-squared = 0.6561 for 57 degrees of freedom
# Null hypothesis probability = 9.792077e-01
Photon flux (15-150 keV) in 1 sec: 0.999078 ( -0.258882 0.259026 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54263e-08 ( -1.89796e-08 1.91662e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66507 ( -1.75863 0.234927 )
Epeak [keV] : 223.647 ( )
Norm@50keV : 2.82596E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.83 using 59 PHA bins.
# Reduced chi-squared = 0.6578 for 56 degrees of freedom
# Null hypothesis probability = 9.776289e-01
Photon flux (15-150 keV) in 1 sec: 0.998961 ( -0.256918 0.258679 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53855e-08 ( -1.89403e-08 1.9014e-08 ) ergs/cm2
Band function
Time interval is from 0.184 sec. to 1.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47924 ( 1.48076 1.48076 )
beta : -1.83892 ( 1.84722 0.461752 )
Epeak [keV] : 16.7900 ( -16.7255 -16.7255 )
Norm@50keV : 1.71417E-02 ( -0.0173889 0.522249 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.40 using 59 PHA bins.
# Reduced chi-squared = 0.6801 for 55 degrees of freedom
# Null hypothesis probability = 9.667086e-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] : 9.82275 (-3.78748 11.6608)
R^2/D10^2 : 0.469276 (-0.449043 2.54162)
(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 9.163e-09 4.915e-09
25- 50 2.221e-08 1.322e-08
50-150 1.100e-08 7.670e-09
15-150 4.238e-08 2.620e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 119.626 (-73.4563 -119.022)
Norm : 4.16577 (-1.24876 2.10158)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.085e-08 6.525e-09
25- 50 1.940e-08 1.144e-08
50-150 3.457e-08 2.377e-08
15-150 6.483e-08 4.099e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.27217 (-2.42425 3.05222)
R1^2/D10^2 : 4.29007 (-3.61086 78.0033)
kT2 [keV] : 28.4922 (-11.4674 57.1823)
R2^2/D10^2 : 8.29419E-03 (-0.00787123 0.0433932)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.393e-08 8.340e-09
25- 50 1.609e-08 8.995e-09
50-150 3.880e-08 2.467e-08
15-150 6.882e-08 3.572e-08
Plot creation:
Fri May 24 12:10:14 EDT 2024