batgrbproduct analysis for trigger=1228797
batgrbproduct Analysis for Trigger=1228797
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 17 14:35:03 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1228797/batgroup_hand_proc
======================================================================
Trigger: 01228797 Segment: 000
BAT Trigger Time: 737523421.76 [s; MET]
Trigger Stop: 737523422.784 [s; MET]
UTC: 2024-05-16T03:36:28.304860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.770476713133 Dec: -63.5049126358497 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.02
Image Trigger?: NO
Rate S/N Ratio: 15.8113883008419 [ if not an image trigger ]
Image S/N Ratio: 7.02
Flight Position: [ source = BAT ]
RA: 212.770476713133 Dec: -63.5049126358497 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.784386448444 Dec: -63.4949242277593 [deg; J2000]
{ 14h 11m 08.3s , -63d 29' 41.7" }
+/- 1.64657316089115 [arcmin] (estimated 90% radius based on SNR)
+/- 0.728539958224208 [arcmin] (formal 1-sigma fit error)
SNR: 14.9182164984784
Angular difference between Flight and Ground position is 0.705578 arcmin
Partial Coding Fraction: 0.4570312 [ including projection effects ]
Duration
T90: 94.6879999637604 +/- 33.9999632132232
Measured from: -3.6159999370575
to: 91.0720000267029 [s; relative to TRIGTIME]
T50: 28.8480000495911 +/- 10.9063327953925
Measured from: 1.55200004577637
to: 30.4000000953674 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -2.2039999961853
to: -1.2039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.75199997425079
to: 112.496000051498 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.590934 0.827374 0.859687 0.483855
0.100454 0.092849 0.076765 0.063198 [error]
Peak 0.019166 0.040154 0.058822 0.023143
0.012315 0.011534 0.010582 0.008320 [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 1.64e-07 3.89e-07 7.30e-07 3.32e-06 1.98e-06 4.60e-06 erg/cm2
Error 3.98e-08 5.46e-08 7.08e-08 8.30e-07 1.86e-07 8.31e-07 erg/cm2
Peak flux Power-law 2.07e-01 3.05e-01 3.36e-01 6.94e-01 1.06e+00 1.54e+00 ph/cm2/s
Error 1.31e-01 1.18e-01 7.72e-02 3.72e-01 2.92e-01 3.72e-01 ph/cm2/s
Fluence Cutoff-PL 1.66e-07 3.91e-07 7.30e-07 3.26e-06 1.98e-06 4.55e-06 erg/cm2
Error 3.98e-08 5.47e-08 7.09e-08 8.85e-07 1.86e-07 8.81e-07 erg/cm2
Peak flux Cutoff-PL 2.12e-01 3.10e-01 3.36e-01 6.78e-01 1.07e+00 1.54e+00 ph/cm2/s
Error 1.41e-01 1.18e-01 8.35e-02 4.63e-01 2.91e-01 4.67e-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 1.090 0.193 - - 1.61e-03 1.67e-04 60.150 57
CPL 1.086 0.195 10000.0 0.0 1.62e-03 1.60e-04 60.220 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.863 0.480 - - 9.24e-03 2.60e-03 53.020 57
CPL 0.793 0.000 987.7 0.0 9.95e-03 0.00e+00 53.100 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: 32.640000 sec.
T50 in the 50-300 keV band: 15.808000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 117.248 -4.752 112.496
T90 94.688 -3.616 91.072
T50 28.848 1.552 30.400
Peak 1.000 -2.204 -1.204
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.7844 -63.4949 0.0129 43.2 -3.3 1.5351 14.9 TRIG_01228797
------------------------------------------
Foreground time interval of the image:
-4.752 15.341 (delta_t = 20.093 [sec])
Background time interval of the image:
-131.659 -4.752 (delta_t = 126.907 [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 -4.752 sec. to 112.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09042 ( -0.198147 0.187669 )
Norm@50keV : 1.61098E-03 ( -0.000169119 0.000164803 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.15 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.625682e-01
Photon flux (15-150 keV) in 117.2 sec: 0.186694 ( -0.0208654 0.021089 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98009e-06 ( -1.86363e-07 1.86533e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.752 sec. to 112.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08565 ( -0.216206 0.174241 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.61983E-03 ( -0.00016937 0.000150295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.22 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 56 degrees of freedom
# Null hypothesis probability = 3.256588e-01
Photon flux (15-150 keV) in 117.2 sec: 0.186627 ( -0.020893 0.021047 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97911e-06 ( -1.85328e-07 1.85739e-07 ) ergs/cm2
Band function
Time interval is from -4.752 sec. to 112.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.880219 ( 0.880219 0.880219 )
beta : -1.09038 ( 1.09038 0.198124 )
Epeak [keV] : 47.0186 ( -47.0186 9952.98 )
Norm@50keV : 2.86201E-03 ( -0.00140747 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.15 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.948508e-01
Photon flux (15-150 keV) in 117.2 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] : 26.6668 (-4.18881 5.72228)
R^2/D10^2 : 3.33680E-03 (-0.00147752 0.00242684)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.27 using 59 PHA bins.
# Reduced chi-squared = 1.7592 for 57 degrees of freedom
# Null hypothesis probability = 3.527611e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.664e-08 1.037e-08
25- 50 2.731e-07 5.397e-08
50-150 1.423e-06 1.989e-07
15-150 1.743e-06 2.280e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-18.9509 -200)
Norm : 0.834847 (-0.0806089 0.0806089)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.438e-07 3.674e-08
25- 50 4.689e-07 2.162e-07
50-150 1.028e-06 4.866e-07
15-150 1.741e-06 7.575e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.36358 (-2.29138 2.19935)
R1^2/D10^2 : 7.64373E-02 (-0.0493597 0.12111)
kT2 [keV] : 78.2114 (-36.9178 -81.6728)
R2^2/D10^2 : 1.74884E-04 (-0.000129546 0.000493241)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.653e-07 7.177e-08
25- 50 4.262e-07 1.704e-07
50-150 1.431e-06 7.315e-07
15-150 2.023e-06 8.614e-07
Peak spectrum fit
Power-law model
Time interval is from -2.204 sec. to -1.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.863347 ( -0.517671 0.442578 )
Norm@50keV : 9.23780E-03 ( -0.00270589 0.00249561 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9302 for 57 degrees of freedom
# Null hypothesis probability = 6.250213e-01
Photon flux (15-150 keV) in 1 sec: 1.06028 ( -0.287641 0.296428 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05183e-07 ( -2.43273e-08 2.43532e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.204 sec. to -1.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.793453 ( )
Epeak [keV] : 987.715 ( )
Norm@50keV : 9.95357E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.10 using 59 PHA bins.
# Reduced chi-squared = 0.9483 for 56 degrees of freedom
# Null hypothesis probability = 5.851845e-01
Photon flux (15-150 keV) in 1 sec: 1.06649 ( -0.29439 0.28852 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05072e-07 ( -2.42088e-08 2.4351e-08 ) ergs/cm2
Band function
Time interval is from -2.204 sec. to -1.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.713506 ( 0.713506 0.713506 )
beta : -0.863350 ( 0.86335 0.518369 )
Epeak [keV] : 46.0277 ( -46.0277 -46.0277 )
Norm@50keV : 1.49952E-02 ( -0.00792377 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.02 using 59 PHA bins.
# Reduced chi-squared = 0.9640 for 55 degrees of freedom
# Null hypothesis probability = 5.505449e-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] : 30.4046 (-8.88965 18.5951)
R^2/D10^2 : 1.44440E-02 (-0.0105879 0.0276931)
(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 2.072e-09 1.176e-09
25- 50 1.285e-08 7.355e-09
50-150 8.346e-08 4.645e-08
15-150 9.839e-08 4.926e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-63.227 -200)
Norm : 4.79106 (-1.19313 1.19313)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.193e-08 7.075e-09
25- 50 2.295e-08 1.368e-08
50-150 5.033e-08 2.985e-08
15-150 8.521e-08 5.020e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.05462 (-3.31733 14.4079)
R1^2/D10^2 : 0.921183 (-0.880252 5.3338)
kT2 [keV] : 43.9607 (-17.608 -43.9719)
R2^2/D10^2 : 4.65202E-03 (-0.00453724 0.013492)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.507e-09 5.590e-09
25- 50 1.790e-08 1.033e-08
50-150 8.272e-08 4.709e-08
15-150 1.091e-07 5.490e-08
Plot creation:
Fri May 17 14:46:32 EDT 2024