batgrbproduct analysis for trigger=1108021
batgrbproduct Analysis for Trigger=1108021
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 27 11:18:30 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1108021/GCN5_download_cron
======================================================================
Trigger: 01108021 Segment: 000
BAT Trigger Time: 675257360 [s; MET]
Trigger Stop: 675257456 [s; MET]
UTC: 2022-05-26T11:28:50.793460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.882992195959 Dec: -15.826487656551 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.61
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.61
Flight Position: [ source = BAT ]
RA: 244.882992195959 Dec: -15.826487656551 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.926654274018 Dec: -15.7720726806221 [deg; J2000]
{ 16h 19m 42.4s , -15d 46' 19.5" }
+/- 1.64375049340362 [arcmin] (estimated 90% radius based on SNR)
+/- 0.696480439834805 [arcmin] (formal 1-sigma fit error)
SNR: 14.9548267251355
Angular difference between Flight and Ground position is 4.124775 arcmin
Partial Coding Fraction: 0.4882812 [ including projection effects ]
Duration
T90: 179.491999983788 +/- 288.46322300155
Measured from: 188.660000085831
to: 368.152000069618 [s; relative to TRIGTIME]
T50: 98.944000005722 +/- 319.400411436681
Measured from: 223.012000083923
to: 321.956000089645 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 376.927999973297
to: 377.927999973297 [s; relative to TRIGTIME]
Total Fluence
Measured from: -86.6200000047684
to: 394.932000041008 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.418016 0.710243 -0.044193 0.037940
0.226680 0.206003 0.173262 0.171902 [error]
Peak 0.020195 0.070246 0.033357 0.030233
0.048789 0.042490 0.033176 0.039869 [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-06 4.21e-07 3.08e-08 2.41e-09 3.12e-06 3.12e-06 erg/cm2
Error 2.72e-07 8.96e-08 1.57e-08 2.12e-09 2.93e-07 2.93e-07 erg/cm2
Peak flux Power-law 1.88e-019.91e-06 2.46e-011.55e-04 2.36e-012.24e-03 4.04e-012.98e-01 8.04e-011.15e-02 1.07e+003.00e-01 ph/cm2/s
Error 3.85e-01 2.94e-01 2.25e-01 2.37e+00 8.75e-01 2.40e+00 ph/cm2/s
Fluence Cutoff-PL 2.72e-06 2.70e-07 2.68e-10 7.74e-17 2.99e-06 2.99e-06 erg/cm2
Error 2.94e-07 1.12e-07 3.28e-09 4.06e-12 3.04e-07 3.04e-07 erg/cm2
Peak flux Cutoff-PL 1.95e-01 2.51e-01 2.36e-01 3.91e-01 8.13e-01 1.08e+00 ph/cm2/s
Error 3.84e-01 3.03e-01 2.52e-01 -------- 8.75e-01 1.16e+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 5.773 0.428 - - 6.56e-05 2.71e-05 43.420 57
CPL 1.000 0.000 50.0 0.0 1.19e-03 0.00e+00 289.480 56
The chi2 of BB fit is 36.31 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 -2.853 1.609 - - 1.28e-05 1.22e-05 45.420 57
CPL 8.519 0.000 358.6 0.0 1.94e-36 0.00e+00 45.420 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 481.552 -86.620 394.932
T90 179.492 188.660 368.152
T50 98.944 223.012 321.956
Peak 1.000 376.928 377.928
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9267 -15.7721 0.0129 25.5 83.7 5.3401 15.0 TRIG_01108021
------------------------------------------
Foreground time interval of the image:
-20.599 97.870 (delta_t = 118.469 [sec])
99.000 101.901 (delta_t = 2.901 [sec])
Background time interval of the image:
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
-86.620000 -21.730000
-21.000000 97.870000
99.000000 145.660000
147.000000 225.040000
226.000000 394.932000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.77310 ( -0.420023 0.436914 )
Norm@50keV : 6.55576E-05 ( -2.28732e-05 3.13154e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.42 using 59 PHA bins.
# Reduced chi-squared = 0.7617 for 57 degrees of freedom
# Null hypothesis probability = 9.076601e-01
Photon flux (15-150 keV) in 477.4 sec: 0.215052 ( -0.0209606 0.0210084 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12042e-06 ( -2.92496e-07 2.92539e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-86.620000 -21.730000
-21.000000 97.870000
99.000000 145.660000
147.000000 225.040000
226.000000 394.932000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.18510E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 289.48 using 59 PHA bins.
# Reduced chi-squared = 5.1692 for 56 degrees of freedom
# Null hypothesis probability = 3.378117e-33
Photon flux (15-150 keV) in 477.4 sec: 0.210339 ( -0.022752 0.022353 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99085e-06 ( -3.05593e-07 3.01459e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-86.620000 -21.730000
-21.000000 97.870000
99.000000 145.660000
147.000000 225.040000
226.000000 394.932000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.60443 ( 5.80628 8.60443 )
beta : -5.82000 ( -0.402652 0.458797 )
Epeak [keV] : 426.950 ( -426.95 -426.95 )
Norm@50keV : 8.50613E-03 ( -0.00286718 0.00452236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.45 using 59 PHA bins.
# Reduced chi-squared = 0.7900 for 55 degrees of freedom
# Null hypothesis probability = 8.696303e-01
Photon flux (15-150 keV) in 477.4 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] : 2.66547 (-0.207654 0.233693)
R^2/D10^2 : 66.0246 (-30.9184 58.2167)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.31 using 59 PHA bins.
# Reduced chi-squared = 0.6370 for 57 degrees of freedom
# Null hypothesis probability = 9.851810e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.720e-06 6.595e-07
25- 50 2.573e-07 7.171e-08
50-150 1.493e-10 1.115e-10
15-150 2.977e-06 5.211e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.79866 (-0.553781 0.667432)
Norm : 57.2063 (-23.082 39.5599)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.722e-06 4.495e-07
25- 50 3.129e-07 8.080e-08
50-150 1.313e-09 9.391e-10
15-150 3.036e-06 5.583e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.67000 (-0.211478 0.230013)
R1^2/D10^2 : 65.2625 (-30.2214 58.9166)
kT2 [keV] : 199.363 (-0.834591 -0.834591)
R2^2/D10^2 : 2.47536E-12 (-1.14118e-13 -1.14118e-13)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.720e-06 6.046e-07
25- 50 2.590e-07 7.397e-08
50-150 1.529e-10 1.155e-10
15-150 2.979e-06 6.170e-07
Peak spectrum fit
Power-law model
Time interval is from 376.928 sec. to 377.928 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.85337 ( 2.85337 6.07189 )
Norm@50keV : 1.28336E-05 ( -1.28336e-05 1.15428e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.42 using 59 PHA bins.
# Reduced chi-squared = 0.7968 for 57 degrees of freedom
# Null hypothesis probability = 8.653433e-01
Photon flux (15-150 keV) in 1 sec: 0.804440 1.14758E-02 ( -0.804891 0.945918 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61655e-16 ( -6.66495e-08 6.69009e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 376.928 sec. to 377.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.51879 ( )
Epeak [keV] : 358.553 ( )
Norm@50keV : 1.93690E-36 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.42 using 59 PHA bins.
# Reduced chi-squared = 0.8111 for 56 degrees of freedom
# Null hypothesis probability = 8.429618e-01
Photon flux (15-150 keV) in 1 sec: 0.812831 1.63816E-08 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09075e-22 ( 0 0 ) ergs/cm2
Band function
Time interval is from 376.928 sec. to 377.928 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.96518 -4.96518 )
beta : -1.46426 ( 1.4182 1.4182 )
Epeak [keV] : 37.2576 ( )
Norm@50keV : 59.0959 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.27 using 59 PHA bins.
# Reduced chi-squared = 0.8231 for 55 degrees of freedom
# Null hypothesis probability = 8.223088e-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] : 22.6154 (-23.14 -23.14)
R^2/D10^2 : 2.39659E-02 (-0.0210883 8.49598)
(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 2.239e-09 2.035e-09
25- 50 1.203e-08 1.013e-08
50-150 4.599e-08 3.955e-08
15-150 6.027e-08 4.667e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 3.72899 (-3.72899 8.84461)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.286e-09 6.960e-09
25- 50 1.786e-08 1.381e-08
50-150 3.917e-08 3.047e-08
15-150 6.632e-08 5.255e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.363 (-199.363 -199.363)
R1^2/D10^2 : 1.65844E-04 (-0.00017107 80.7289)
kT2 [keV] : 9.91719 (-9.85962 -9.85962)
R2^2/D10^2 : 0.356088 (-0.357509 -0.357509)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.324e-09 6.250e-09
25- 50 1.928e-08 1.519e-08
50-150 5.281e-08 1.155e-08
15-150 7.942e-08 3.262e-08
Plot creation:
Fri May 27 11:27:28 EDT 2022