batgrbproduct analysis for trigger=1156572
batgrbproduct Analysis for Trigger=1156572
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): Wed Mar 1 05:51:12 EST 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1156572/GCN5_download_cron
======================================================================
Trigger: 01156572 Segment: 000
BAT Trigger Time: 699256281.088 [s; MET]
Trigger Stop: 699256282.112 [s; MET]
UTC: 2023-02-28T05:50:50.250320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 18.4033334147616 Dec: 44.4885974077295 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.96
Image Trigger?: NO
Rate S/N Ratio: 25.0399680510978 [ if not an image trigger ]
Image S/N Ratio: 11.96
Flight Position: [ source = BAT ]
RA: 18.4033334147616 Dec: 44.4885974077295 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 18.3968849591233 Dec: 44.4949821250589 [deg; J2000]
{ 01h 13m 35.3s , +44d 29' 41.9" }
+/- 1.53061776084976 [arcmin] (estimated 90% radius based on SNR)
+/- 0.53999659291267 [arcmin] (formal 1-sigma fit error)
SNR: 16.5585775000289
Angular difference between Flight and Ground position is 0.472154 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 2.17999994754791 +/- 0.397471986918358
Measured from: 0.0800000429153442
to: 2.25999999046326 [s; relative to TRIGTIME]
T50: 0.944000005722046 +/- 0.281538590504795
Measured from: 0.48800003528595
to: 1.432000041008 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.175999999046326
to: 1.17599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0480000972747803
to: 2.52799999713898 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.181920 0.235670 0.160781 0.029484
0.020573 0.021962 0.019501 0.015013 [error]
Peak 0.087111 0.141946 0.116997 0.019913
0.013064 0.015058 0.014022 0.010125 [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 5.76e-08 9.61e-08 1.22e-07 3.09e-07 3.61e-07 5.84e-07 erg/cm2
Error 9.04e-09 1.01e-08 1.80e-08 9.19e-08 4.34e-08 1.09e-07 erg/cm2
Peak flux Power-law 9.79e-01 9.95e-01 7.12e-01 8.13e-01 3.01e+00 3.50e+00 ph/cm2/s
Error 1.82e-01 1.22e-01 1.08e-01 2.40e-01 3.55e-01 4.26e-01 ph/cm2/s
Fluence Cutoff-PL 5.22e-08 1.06e-07 1.25e-07 9.81e-08 3.40e-07 3.82e-07 erg/cm2
Error 1.03e-08 1.36e-08 2.05e-08 -------- 4.68e-08 1.16e-07 erg/cm2
Peak flux Cutoff-PL 8.19e-01 1.10e+00 7.88e-01 3.32e-01 2.93e+00 3.04e+00 ph/cm2/s
Error 2.17e-01 1.53e-01 1.31e-01 2.58e-01 3.60e-01 4.34e-01 ph/cm2/s
Fluence Band 5.12e-08 1.08e-07 1.20e-07 1.80e-07 3.43e-07 4.59e-07 erg/cm2
Error 1.04e-08 -------- 2.33e-08 -------- -------- -------- erg/cm2
Peak flux Band 8.65e-01 1.07e+00 7.73e-01 4.18e-01 2.97e+00 3.13e+00 ph/cm2/s
Error -------- 1.59e-01 1.22e-01 -------- 3.73e-01 4.58e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.658 0.173 - - 1.51e-02 1.70e-03 54.320 57
CPL 0.836 0.774 65.7 57.9 4.20e-02 5.04e-02 50.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.483 0.189 - - 2.42e-02 2.96e-03 49.230 57
CPL 0.481 0.874 77.4 55.7 7.70e-02 9.80e-02 44.360 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: 1.024000 sec.
T50 in the 50-300 keV band: 0.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.576 -0.048 2.528
T90 2.180 0.080 2.260
T50 0.944 0.488 1.432
Peak 1.000 0.176 1.176
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
18.3969 +44.4950 0.0117 30.8 177.7 0.6464 16.6 TRIG_01156572
------------------------------------------
Foreground time interval of the image:
-0.048 2.528 (delta_t = 2.576 [sec])
Background time interval of the image:
-214.587 -0.048 (delta_t = 214.539 [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 -0.048 sec. to 2.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65789 ( -0.170162 0.175086 )
Norm@50keV : 1.50968E-02 ( -0.0017111 0.00169147 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.32 using 59 PHA bins.
# Reduced chi-squared = 0.9530 for 57 degrees of freedom
# Null hypothesis probability = 5.761220e-01
Photon flux (15-150 keV) in 2.576 sec: 1.97642 ( -0.206995 0.207095 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61405e-07 ( -4.31019e-08 4.36021e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.048 sec. to 2.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.835713 ( -0.844927 0.702097 )
Epeak [keV] : 65.7239 ( -15.2316 100.532 )
Norm@50keV : 4.19592E-02 ( -0.0240669 0.0767238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.21 using 59 PHA bins.
# Reduced chi-squared = 0.8967 for 56 degrees of freedom
# Null hypothesis probability = 6.925814e-01
Photon flux (15-150 keV) in 2.576 sec: 1.92990 ( -0.21103 0.21098 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40387e-07 ( -4.6368e-08 4.72567e-08 ) ergs/cm2
Band function
Time interval is from -0.048 sec. to 2.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.835675 ( -0.637335 0.703679 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 65.7112 ( -14.3024 100.407 )
Norm@50keV : 4.19598E-02 ( -0.0240665 0.0766564 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.21 using 59 PHA bins.
# Reduced chi-squared = 0.9130 for 55 degrees of freedom
# Null hypothesis probability = 6.577027e-01
Photon flux (15-150 keV) in 2.576 sec: 1.93638 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4335e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.7953 (-1.50889 1.72299)
R^2/D10^2 : 0.396883 (-0.146053 0.227688)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.20 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.131771e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.550e-08 6.723e-09
25- 50 1.202e-07 1.731e-08
50-150 1.232e-07 2.670e-08
15-150 2.789e-07 3.702e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.400 (-48.9889 -137.38)
Norm : 8.24068 (-0.966607 1.19763)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.480e-08 9.364e-09
25- 50 1.006e-07 3.087e-08
50-150 1.931e-07 9.502e-08
15-150 3.485e-07 1.305e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.82523 (-2.31001 2.7889)
R1^2/D10^2 : 2.27747 (-1.45619 6.9346)
kT2 [keV] : 21.4851 (-5.70022 15.4299)
R2^2/D10^2 : 4.36254E-02 (-0.0381401 0.0637262)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.244e-08 2.753e-08
25- 50 1.063e-07 4.343e-08
50-150 1.827e-07 9.911e-08
15-150 3.414e-07 1.650e-07
Peak spectrum fit
Power-law model
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48323 ( -0.185541 0.191548 )
Norm@50keV : 2.41798E-02 ( -0.0029711 0.00294769 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.23 using 59 PHA bins.
# Reduced chi-squared = 0.8636 for 57 degrees of freedom
# Null hypothesis probability = 7.583333e-01
Photon flux (15-150 keV) in 1 sec: 3.00518 ( -0.355039 0.355197 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30024e-07 ( -3.0853e-08 3.11534e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.481371 ( -0.957986 0.790743 )
Epeak [keV] : 77.3902 ( -17.9934 93.389 )
Norm@50keV : 7.69999E-02 ( -0.045478 0.15049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.36 using 59 PHA bins.
# Reduced chi-squared = 0.7921 for 56 degrees of freedom
# Null hypothesis probability = 8.692817e-01
Photon flux (15-150 keV) in 1 sec: 2.93229 ( -0.36032 0.36026 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20406e-07 ( -3.2104e-08 3.2501e-08 ) ergs/cm2
Band function
Time interval is from 0.176 sec. to 1.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.480994 ( -0.469711 1.49092 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 77.3624 ( -17.9771 93.3626 )
Norm@50keV : 7.70392E-02 ( -0.0455207 0.150308 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.36 using 59 PHA bins.
# Reduced chi-squared = 0.8065 for 55 degrees of freedom
# Null hypothesis probability = 8.470894e-01
Photon flux (15-150 keV) in 1 sec: 2.96672 ( 4.03328 -0.40071 ) 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] : 15.3353 (-1.9441 2.23839)
R^2/D10^2 : 0.338714 (-0.128228 0.201944)
(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 1.661e-08 3.205e-09
25- 50 6.735e-08 1.147e-08
50-150 1.088e-07 2.596e-08
15-150 1.928e-07 2.975e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-71.1771 -199.362)
Norm : 12.4162 (-1.44802 1.44954)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.092e-08 8.805e-09
25- 50 5.947e-08 3.274e-08
50-150 1.304e-07 7.230e-08
15-150 2.208e-07 1.190e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.71963 (-4.59645 4.32329)
R1^2/D10^2 : 2.65969 (-2.0071 628.152)
kT2 [keV] : 21.2240 (-5.30546 12.3389)
R2^2/D10^2 : 8.74525E-02 (-0.074403 0.195328)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.586e-08 1.456e-08
25- 50 6.165e-08 3.153e-08
50-150 1.321e-07 7.590e-08
15-150 2.196e-07 1.133e-07
Plot creation:
Wed Mar 1 05:54:25 EST 2023