batgrbproduct analysis for trigger=1107209
batgrbproduct Analysis for Trigger=1107209
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): Thu May 19 22:16:20 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1107209/GCN5_download_cron
======================================================================
Trigger: 01107209 Segment: 000
BAT Trigger Time: 674683840 [s; MET]
Trigger Stop: 674683904 [s; MET]
UTC: 2022-05-19T20:10:10.832320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.074478384337 Dec: -15.4503592629384 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.8
Flight Position: [ source = BAT ]
RA: 245.074478384337 Dec: -15.4503592629384 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.043905833092 Dec: -15.5056937348065 [deg; J2000]
{ 16h 20m 10.5s , -15d 30' 20.5" }
+/- 1.53459613539879 [arcmin] (estimated 90% radius based on SNR)
+/- 0.706058434300626 [arcmin] (formal 1-sigma fit error)
SNR: 16.4972867262381
Angular difference between Flight and Ground position is 3.761391 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 287.131999969482 +/- 23.1910403291063
Measured from: -97.5399998426437
to: 189.592000126839 [s; relative to TRIGTIME]
T50: 164.22000002861 +/- 20.785657640866
Measured from: -18.135999917984
to: 146.084000110626 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -18.0360000133514
to: -17.0360000133514 [s; relative to TRIGTIME]
Total Fluence
Measured from: -116.983999967575
to: 221.740000009537 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.888924 1.031851 0.058788 0.023252
0.159101 0.140150 0.119801 0.109643 [error]
Peak 0.049268 0.032367 -0.001092 0.008866
0.009110 0.008115 0.006954 0.006411 [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 3.83e-06 5.13e-07 3.03e-08 1.90e-09 4.38e-06 4.38e-06 erg/cm2
Error 3.32e-07 6.76e-08 1.02e-08 1.10e-09 3.29e-07 3.29e-07 erg/cm2
Peak flux Power-law 5.16e-01 1.69e-01 3.11e-02 6.67e-03 7.21e-01 7.23e-01 ph/cm2/s
Error 1.48e-01 8.43e-02 3.79e-02 1.56e-02 1.99e-01 2.01e-01 ph/cm2/s
Fluence Cutoff-PL 3.72e-06 3.75e-07 4.30e-10 1.93e-16 4.10e-06 4.10e-06 erg/cm2
Error 3.77e-07 8.01e-08 1.59e-09 2.00e-13 3.82e-07 3.82e-07 erg/cm2
Peak flux Cutoff-PL 5.18e-01 1.64e-01 2.86e-02 5.93e-03 7.17e-01 7.20e-01 ph/cm2/s
Error 1.48e-01 -------- -------- -------- -------- 2.02e-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 6.079 0.306 - - 9.69e-05 2.65e-05 68.640 57
CPL 1.000 0.000 50.0 0.0 1.64e-03 0.00e+00 517.130 56
The chi2 of BB fit is 54.42 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 3.445 1.035 - - 1.86e-03 1.59e-03 70.000 57
CPL 1.858 0.000 2.5 0.0 2.58e-02 0.00e+00 71.070 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 338.724 -116.984 221.740
T90 287.132 -97.540 189.592
T50 164.220 -18.136 146.084
Peak 1.000 -18.036 -17.036
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.0439 -15.5057 0.0117 17.4 99.1 3.2721 16.5 TRIG_01107209
------------------------------------------
Foreground time interval of the image:
-17.699 55.901 (delta_t = 73.600 [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
Time interval is from -116.984 sec. to 221.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.07915 ( -0.304726 0.308187 )
Norm@50keV : 9.69473E-05 ( -2.36513e-05 2.94006e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.64 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 57 degrees of freedom
# Null hypothesis probability = 1.389433e-01
Photon flux (15-150 keV) in 338.7 sec: 0.432021 ( -0.0353586 0.0356764 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37783e-06 ( -3.27975e-07 3.3019e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -116.984 sec. to 221.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.64367E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 517.13 using 59 PHA bins.
# Reduced chi-squared = 9.2344 for 56 degrees of freedom
# Null hypothesis probability = 7.200417e-76
Photon flux (15-150 keV) in 338.7 sec: 0.405954 ( -0.042139 0.041042 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.096e-06 ( -3.87236e-07 3.77312e-07 ) ergs/cm2
Band function
Time interval is from -116.984 sec. to 221.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.46404 ( 5.9685 8.46404 )
beta : -6.10824 ( -0.287528 0.327524 )
Epeak [keV] : 371.996 ( -371.996 -371.996 )
Norm@50keV : 1.28260E-02 ( -0.00302653 0.00419695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.66 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 55 degrees of freedom
# Null hypothesis probability = 1.019143e-01
Photon flux (15-150 keV) in 338.7 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] : 2.68877 (-0.148722 0.163159)
R^2/D10^2 : 118.733 (-44.7889 71.0646)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.42 using 59 PHA bins.
# Reduced chi-squared = 0.9547 for 57 degrees of freedom
# Null hypothesis probability = 5.725608e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.684e-06 5.011e-07
25- 50 3.602e-07 5.876e-08
50-150 2.263e-10 1.227e-10
15-150 4.044e-06 5.394e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.67053 (-0.373348 0.428646)
Norm : 124.158 (-40.0607 59.0832)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.791e-06 4.747e-07
25- 50 4.090e-07 6.483e-08
50-150 1.486e-09 8.176e-10
15-150 4.202e-06 5.651e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.870230 (-0.150671 0.16227)
R1^2/D10^2 : 1.77386E+06 (-1.6176e+06 -1.61768e+06)
kT2 [keV] : 2.74945 (-0.184931 18.8182)
R2^2/D10^2 : 97.7732 (-97.4905 77.3203)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.683e-06 6.063e-07
25- 50 3.619e-07 5.866e-08
50-150 5.125e-08 1.229e-10
15-150 4.096e-06 4.854e-07
Peak spectrum fit
Power-law model
Time interval is from -18.036 sec. to -17.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.44528 ( -0.829643 1.2413 )
Norm@50keV : 1.86264E-03 ( -0.00133914 0.0018443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.00 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.157058e-01
Photon flux (15-150 keV) in 1 sec: 0.720766 ( -0.198962 0.199297 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.83545e-08 ( -1.00599e-08 1.18255e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -18.036 sec. to -17.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85753 ( )
Epeak [keV] : 2.49138 ( )
Norm@50keV : 2.58262E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.07 using 59 PHA bins.
# Reduced chi-squared = 1.269 for 56 degrees of freedom
# Null hypothesis probability = 8.455187e-02
Photon flux (15-150 keV) in 1 sec: 0.716605 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79371e-08 ( -9.7385e-09 1.22527e-08 ) ergs/cm2
Band function
Time interval is from -18.036 sec. to -17.036 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.07192 ( 2.07194 2.07194 )
beta : -3.44491 ( -1.24216 0.828768 )
Epeak [keV] : 0.367637 ( -0.367637 -0.367637 )
Norm@50keV : 1.02378 ( 13.1599 -1.02385 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.00 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 55 degrees of freedom
# Null hypothesis probability = 8.385560e-02
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] : 3.81839 (-1.25243 2.15515)
R^2/D10^2 : 22.3135 (-22.5313 208.888)
(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 1.613e-08 9.505e-09
25- 50 5.090e-09 3.259e-09
50-150 4.642e-11 5.100e-11
15-150 2.127e-08 1.272e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7644 (-6.78709 15.18)
Norm : 15.5992 (-9.7708 60.7444)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.533e-08 8.720e-09
25- 50 8.888e-09 5.534e-09
50-150 1.118e-09 1.034e-09
15-150 2.533e-08 1.540e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.45314 (-1.29939 1.5697)
R1^2/D10^2 : 230.228 (-247.227 257040)
kT2 [keV] : 9.60592 (-4.24435 12.6181)
R2^2/D10^2 : 0.208604 (-0.215326 1.3113)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.486e-08 7.715e-09
25- 50 9.809e-09 6.215e-09
50-150 4.205e-09 3.044e-09
15-150 2.887e-08 1.461e-08
Plot creation:
Thu May 19 22:20:06 EDT 2022