batgrbproduct analysis for trigger=1223072
batgrbproduct Analysis for Trigger=1223072
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): Sat Apr 20 07:54:11 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1223072/GCN5_download_cron
======================================================================
Trigger: 01223072 Segment: 000
BAT Trigger Time: 735222205.632 [s; MET]
Trigger Stop: 735222209.728 [s; MET]
UTC: 2024-04-19T12:22:52.334300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 325.876862975223 Dec: 4.23355449629783 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.25
Image Trigger?: NO
Rate S/N Ratio: 8.48528137423857 [ if not an image trigger ]
Image S/N Ratio: 8.25
Flight Position: [ source = BAT ]
RA: 325.876862975223 Dec: 4.23355449629783 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 325.852899787376 Dec: 4.2994905424873 [deg; J2000]
{ 21h 43m 24.7s , +04d 17' 58.2" }
+/- 3.25884041340778 [arcmin] (estimated 90% radius based on SNR)
+/- 2.49922328383174 [arcmin] (formal 1-sigma fit error)
SNR: 5.62562920490128
Angular difference between Flight and Ground position is 4.207972 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 132.163999915123 +/- 26.2867465141511
Measured from: 1.00800013542175
to: 133.172000050545 [s; relative to TRIGTIME]
T50: 97.9639998674393 +/- 79.2738167205399
Measured from: 20.9120001792908
to: 118.87600004673 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 116.360000014305
to: 117.360000014305 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.32400000095367
to: 159.544000029564 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.350070 2.666268 1.587664 0.384799
0.099603 0.102507 0.087609 0.074236 [error]
Peak 0.075141 0.106040 0.070209 0.016322
0.007009 0.007431 0.006410 0.004839 [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 8.37e-07 1.19e-06 1.27e-06 2.48e-06 4.07e-06 5.78e-06 erg/cm2
Error 6.46e-08 5.60e-08 8.76e-08 3.61e-07 2.04e-07 4.35e-07 erg/cm2
Peak flux Power-law 9.01e-01 7.90e-01 4.75e-01 4.30e-01 2.35e+00 2.60e+00 ph/cm2/s
Error 1.19e-01 6.61e-02 5.19e-02 9.28e-02 1.96e-01 2.10e-01 ph/cm2/s
Fluence Cutoff-PL 7.99e-07 1.23e-06 1.28e-06 1.58e-06 3.98e-06 4.89e-06 erg/cm2
Error 7.72e-08 6.84e-08 9.21e-08 5.82e-07 2.31e-07 9.74e-07 erg/cm2
Peak flux Cutoff-PL 7.81e-01 8.52e-01 5.04e-01 1.93e-01 2.27e+00 2.33e+00 ph/cm2/s
Error 1.47e-01 8.33e-02 6.02e-02 -------- 2.06e-01 2.42e-01 ph/cm2/s
Fluence Band 7.86e-07 1.23e-06 1.26e-06 2.02e-06 3.98e-06 5.32e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 7.76e-01 8.64e-01 4.99e-01 2.43e-01 2.27e+00 2.38e+00 ph/cm2/s
Error -------- 8.78e-02 -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.916 0.088 - - 2.73e-03 1.38e-04 43.640 57
CPL 1.620 0.345 61.2 -22.9 3.89e-03 1.64e-03 41.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.734 0.139 - - 1.75e-02 1.50e-03 48.280 57
CPL 0.907 0.684 64.8 31.4 4.64e-02 4.37e-02 43.050 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: 100.032000 sec.
T50 in the 50-300 keV band: 100.032000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 162.868 -3.324 159.544
T90 132.164 1.008 133.172
T50 97.964 20.912 118.876
Peak 1.000 116.360 117.360
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
325.8529 +4.2995 0.0341 39.9 11.9 1.3004 5.6 TRIG_01223072
------------------------------------------
Foreground time interval of the image:
-3.324 48.169 (delta_t = 51.493 [sec])
Background time interval of the image:
-60.632 -55.352 (delta_t = 5.280 [sec])
-17.632 -3.324 (delta_t = 14.308 [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
-3.324000 59.988000
60.368000 159.544000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91594 ( -0.0870875 0.0884537 )
Norm@50keV : 2.72520E-03 ( -0.00013844 0.000137473 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.64 using 59 PHA bins.
# Reduced chi-squared = 0.7656 for 57 degrees of freedom
# Null hypothesis probability = 9.034019e-01
Photon flux (15-150 keV) in 162.5 sec: 0.393767 ( -0.019258 0.0193094 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.07217e-06 ( -2.03424e-07 2.04253e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-3.324000 59.988000
60.368000 159.544000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61962 ( -0.362929 0.32627 )
Epeak [keV] : 61.1503 ( -15.3229 -61.1503 )
Norm@50keV : 3.88729E-03 ( -0.00121604 0.0020688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.36 using 59 PHA bins.
# Reduced chi-squared = 0.7386 for 56 degrees of freedom
# Null hypothesis probability = 9.280685e-01
Photon flux (15-150 keV) in 162.5 sec: 0.386653 ( -0.020755 0.02079 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97628e-06 ( -2.3114e-07 2.3114e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-3.324000 59.988000
60.368000 159.544000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61961 ( -0.278752 0.324055 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 61.1388 ( -14.946 -61.1388 )
Norm@50keV : 3.88654E-03 ( -0.00120569 0.00206899 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.36 using 59 PHA bins.
# Reduced chi-squared = 0.7521 for 55 degrees of freedom
# Null hypothesis probability = 9.133211e-01
Photon flux (15-150 keV) in 162.5 sec: 0.386782 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.97659e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9916 ( )
R^2/D10^2 : 8.91542E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 150.31 using 59 PHA bins.
# Reduced chi-squared = 2.6370 for 57 degrees of freedom
# Null hypothesis probability = 2.418836e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.406e-07 3.681e-08
25- 50 1.386e-06 7.735e-08
50-150 1.197e-06 1.299e-07
15-150 3.023e-06 1.674e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 87.0579 (-13.0278 16.9577)
Norm : 1.76876 (-0.130503 0.143979)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.491e-07 5.972e-08
25- 50 1.258e-06 6.272e-08
50-150 1.876e-06 4.794e-07
15-150 3.883e-06 2.722e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.91000 (-0.931243 1.06639)
R1^2/D10^2 : 0.894403 (-0.399779 0.850992)
kT2 [keV] : 20.7127 (-2.8979 4.34705)
R2^2/D10^2 : 8.55127E-03 (-0.00450859 0.00726492)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.731e-07 1.302e-07
25- 50 1.214e-06 1.627e-07
50-150 1.898e-06 3.587e-07
15-150 3.885e-06 5.801e-07
Peak spectrum fit
Power-law model
Time interval is from 116.360 sec. to 117.360 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73391 ( -0.137376 0.140889 )
Norm@50keV : 1.74787E-02 ( -0.00150948 0.00149703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.28 using 59 PHA bins.
# Reduced chi-squared = 0.8470 for 57 degrees of freedom
# Null hypothesis probability = 7.878571e-01
Photon flux (15-150 keV) in 1 sec: 2.34956 ( -0.195478 0.195813 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61439e-07 ( -1.43886e-08 1.44776e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 116.360 sec. to 117.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.906926 ( -0.740615 0.628354 )
Epeak [keV] : 64.8054 ( -12.1002 50.6612 )
Norm@50keV : 4.64195E-02 ( -0.0239784 0.0634208 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.05 using 59 PHA bins.
# Reduced chi-squared = 0.7687 for 56 degrees of freedom
# Null hypothesis probability = 8.978290e-01
Photon flux (15-150 keV) in 1 sec: 2.26805 ( -0.20604 0.2053 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53683e-07 ( -1.5653e-08 1.5741e-08 ) ergs/cm2
Band function
Time interval is from 116.360 sec. to 117.360 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.815148 ( -0.697167 1.07758 )
beta : -2.47182 ( 2.48869 0.641703 )
Epeak [keV] : 61.5768 ( -17.2475 47.1814 )
Norm@50keV : 5.25289E-02 ( -0.0297878 0.16773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.84 using 59 PHA bins.
# Reduced chi-squared = 0.7790 for 55 degrees of freedom
# Null hypothesis probability = 8.835128e-01
Photon flux (15-150 keV) in 1 sec: 2.27076 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53612e-07 ( -1.53605e-07 -7.939e-09 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.3653 (-1.14385 1.25838)
R^2/D10^2 : 0.394773 (-0.111867 0.15404)
(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 1.494e-08 2.200e-09
25- 50 5.301e-08 5.290e-09
50-150 6.082e-08 1.192e-08
15-150 1.288e-07 1.210e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 124.979 (-34.1786 52.831)
Norm : 9.89269 (-0.983436 1.21655)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.572e-08 3.065e-09
25- 50 4.633e-08 5.915e-09
50-150 8.433e-08 3.291e-08
15-150 1.564e-07 3.390e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.36455 (-1.20528 2.55351)
R1^2/D10^2 : 41.6399 (-38.0214 594.349)
kT2 [keV] : 15.5864 (-1.79326 3.0142)
R2^2/D10^2 : 0.205674 (-0.110056 0.134194)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.573e-08 9.809e-09
25- 50 4.601e-08 7.665e-09
50-150 7.182e-08 1.420e-08
15-150 1.436e-07 2.370e-08
Plot creation:
Sat Apr 20 07:56:35 EDT 2024