batgrbproduct analysis for trigger=1207446
batgrbproduct Analysis for Trigger=1207446
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): Tue Jan 9 22:34:07 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1207446/GCN5_download_cron
======================================================================
Trigger: 01207446 Segment: 000
BAT Trigger Time: 726465727.824 [s; MET]
Trigger Stop: 726465727.888 [s; MET]
UTC: 2024-01-09T04:01:35.126280 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 301.317618087209 Dec: 16.5775370553961 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.22
Image Trigger?: NO
Rate S/N Ratio: 19.2613602842582 [ if not an image trigger ]
Image S/N Ratio: 7.22
Flight Position: [ source = BAT ]
RA: 301.317618087209 Dec: 16.5775370553961 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 301.32969807042 Dec: 16.5661914655644 [deg; J2000]
{ 20h 05m 19.1s , +16d 33' 58.3" }
+/- 2.54437020397716 [arcmin] (estimated 90% radius based on SNR)
+/- 1.1800030407611 [arcmin] (formal 1-sigma fit error)
SNR: 8.01157587022325
Angular difference between Flight and Ground position is 0.972625 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 0.159999966621399 +/- 0.0576887720036286
Measured from: -0.0399998426437378
to: 0.120000123977661 [s; relative to TRIGTIME]
T50: 0.031999945640564 +/- 0.0452549257074814
Measured from: 0.0240001678466797
to: 0.0560001134872437 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.435999989509583
to: 0.564000010490417 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0399999618530273
to: 0.151999950408936 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.013670 0.028934 0.025382 0.003662
0.004279 0.004881 0.004357 0.002835 [error]
Peak 0.017306 0.036300 0.034149 0.001671
0.008279 0.008447 0.007554 0.005816 [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 4.81e-09 4.16e-09 2.47e-09 2.18e-09 1.24e-08 1.36e-08 erg/cm2
Error 1.73e-09 1.41e-09 1.08e-09 1.43e-09 4.21e-09 4.82e-09 erg/cm2
Peak flux Power-law 1.93e-01 2.27e-01 1.93e-01 2.78e-01 7.12e-01 8.91e-01 ph/cm2/s
Error 9.29e-02 6.90e-02 5.76e-02 1.74e-01 1.92e-01 2.42e-01 ph/cm2/s
Fluence Cutoff-PL 2.58e-09 1.40e-08 1.27e-08 7.95e-10 3.01e-08 3.05e-08 erg/cm2
Error 1.68e-09 2.26e-09 4.46e-09 8.42e-10 6.23e-09 6.41e-09 erg/cm2
Peak flux Cutoff-PL 1.75e-01 2.38e-01 2.03e-01 1.64e-01 7.01e-01 7.80e-01 ph/cm2/s
Error 1.05e-01 7.97e-02 6.67e-02 1.51e-01 1.95e-01 2.91e-01 ph/cm2/s
Fluence Band 2.93e-09 1.37e-08 1.26e-08 1.03e-09 3.03e-08 3.04e-08 erg/cm2
Error 1.13e-09 2.97e-09 4.26e-09 -------- 6.35e-09 6.38e-09 erg/cm2
Peak flux Band 1.75e-01 2.38e-01 2.03e-01 1.62e-01 7.00e-01 7.78e-01 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 2.750 0.347 - - 5.95e-03 2.26e-03 110.630 57
CPL -3.363 2.160 49.8 6.2 7.74e+00 5.56e+01 64.320 56
The chi2 of BB fit is 66.86 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 1.236 0.445 - - 6.03e-03 1.57e-03 87.940 57
CPL 0.744 1.502 133.7 0.0 1.05e-02 0.00e+00 87.630 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 0.192 -0.040 0.152
T90 0.160 -0.040 0.120
T50 0.032 0.024 0.056
Peak 1.000 -0.436 0.564
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
301.3297 +16.5662 0.0240 22.6 -103.8 0.0680 8.0 TRIG_01207446
------------------------------------------
Foreground time interval of the image:
-0.040 0.152 (delta_t = 0.192 [sec])
Background time interval of the image:
-25.723 -0.040 (delta_t = 25.683 [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 -0.040 sec. to 0.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.75025 ( -0.317072 0.376904 )
Norm@50keV : 5.95319E-03 ( -0.00231325 0.00221538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 110.63 using 59 PHA bins.
# Reduced chi-squared = 1.9410 for 57 degrees of freedom
# Null hypothesis probability = 2.698427e-05
Photon flux (15-150 keV) in 0.192 sec: 1.37684 ( -0.466655 0.461498 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23873e-08 ( -4.19733e-09 4.22529e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.040 sec. to 0.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.36320 ( -2.65252 1.66714 )
Epeak [keV] : 49.8257 ( -6.178 6.13778 )
Norm@50keV : 7.73613 ( -7.50309 103.671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.32 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 56 degrees of freedom
# Null hypothesis probability = 2.083068e-01
Photon flux (15-150 keV) in 0.192 sec: 2.30996 ( -0.49976 0.50386 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.01131e-08 ( -6.28109e-09 6.17318e-09 ) ergs/cm2
Band function
Time interval is from -0.040 sec. to 0.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.38849 ( -2.47669 -4.14759 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 49.9992 ( -6.98422 5.40387 )
Norm@50keV : 7.90887 ( -7.90426 33.1707 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.38 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Null hypothesis probability = 1.811700e-01
Photon flux (15-150 keV) in 0.192 sec: 2.29111 ( 4.70889 -0.4566 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02884e-08 ( -3.0287e-08 -6.57888e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2196 (-1.45116 1.27242)
R^2/D10^2 : 0.680315 (-0.244042 0.397721)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.86 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.745684e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.131e-09 1.279e-09
25- 50 1.328e-08 3.242e-09
50-150 1.206e-08 4.067e-09
15-150 2.947e-08 7.757e-09
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 37.4052 (-8.47085 10.1212)
Norm : 13.9660 (-4.02923 4.6373)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.013e-09 1.692e-09
25- 50 7.678e-09 2.003e-09
50-150 5.511e-09 2.561e-09
15-150 1.920e-08 5.540e-09
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.58298E-02 (52.6398 -0.0358298)
R1^2/D10^2 : 2.23108E-04 (-0.000223118 -0.000223118)
kT2 [keV] : 12.2446 (-1.43793 1.2854)
R2^2/D10^2 : 0.675473 (-0.242142 0.39963)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.436 sec. to 0.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23585 ( -0.455348 0.434789 )
Norm@50keV : 6.03394E-03 ( -0.00157455 0.00157455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.94 using 59 PHA bins.
# Reduced chi-squared = 1.543 for 57 degrees of freedom
# Null hypothesis probability = 5.306595e-03
Photon flux (15-150 keV) in 1 sec: 0.712049 ( -0.191334 0.192329 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.06148e-08 ( -1.71191e-08 1.74116e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.436 sec. to 0.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.743771 ( -2.10074 0.902458 )
Epeak [keV] : 133.656 ( -133.664 -133.664 )
Norm@50keV : 1.05215E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.63 using 59 PHA bins.
# Reduced chi-squared = 1.565 for 56 degrees of freedom
# Null hypothesis probability = 4.386451e-03
Photon flux (15-150 keV) in 1 sec: 0.700706 ( -0.194499 0.195286 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88235e-08 ( -1.86499e-08 1.8301e-08 ) ergs/cm2
Band function
Time interval is from -0.436 sec. to 0.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.62325 ( -0.710564 1.08627 )
beta : -1.52869 ( 9.37132 19.3713 )
Epeak [keV] : 34.7193 ( -77.9141 -140.209 )
Norm@50keV : 11.8028 ( -17.7723 263.275 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.39 using 59 PHA bins.
# Reduced chi-squared = 1.571 for 55 degrees of freedom
# Null hypothesis probability = 4.375422e-03
Photon flux (15-150 keV) in 1 sec: 0.700114 ( ) 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] : 17.8078 (-5.78978 9.28723)
R^2/D10^2 : 4.76235E-02 (-0.0353601 0.132289)
(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 3.034e-09 1.921e-09
25- 50 1.392e-08 7.815e-09
50-150 3.195e-08 2.077e-08
15-150 4.890e-08 2.862e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-99.43 -199.363)
Norm : 2.96760 (-0.785064 0.78735)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.390e-09 4.468e-09
25- 50 1.422e-08 8.710e-09
50-150 3.118e-08 1.911e-08
15-150 5.278e-08 3.205e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.45708 (-4.627 8.62729)
R1^2/D10^2 : 0.375244 (-0.327859 4.23825)
kT2 [keV] : 34.2313 (-24.0631 -34.3027)
R2^2/D10^2 : 4.39455E-03 (-0.00432336 0.0460898)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.782e-09 3.563e-09
25- 50 1.450e-08 8.845e-09
50-150 4.035e-08 2.352e-08
15-150 6.063e-08 2.996e-08
Plot creation:
Tue Jan 9 22:36:03 EST 2024