batgrbproduct analysis for trigger=1164180
batgrbproduct Analysis for Trigger=1164180
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 15 18:32:18 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1164180/GCN5_download_cron
======================================================================
Trigger: 01164180 Segment: 000
BAT Trigger Time: 703181692.352 [s; MET]
Trigger Stop: 703181700.544 [s; MET]
UTC: 2023-04-14T16:14:21.246960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 181.071398844 Dec: 53.1268747077817 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.77
Image Trigger?: NO
Rate S/N Ratio: 11.4891252930761 [ if not an image trigger ]
Image S/N Ratio: 7.77
Flight Position: [ source = BAT ]
RA: 181.071398844 Dec: 53.1268747077817 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 181.052114120263 Dec: 53.1790866296155 [deg; J2000]
{ 12h 04m 12.5s , +53d 10' 44.7" }
+/- 2.4026300367546 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10881701204532 [arcmin] (formal 1-sigma fit error)
SNR: 8.69520745983039
Angular difference between Flight and Ground position is 3.208641 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 25.9840000867844 +/- 8.85519062097694
Measured from: -0.903999924659729
to: 25.0800001621246 [s; relative to TRIGTIME]
T50: 11.2799999713898 +/- 5.5187243924507
Measured from: 1.89600014686584
to: 13.1760001182556 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.30799996852875
to: 10.3079999685287 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.76800000667572
to: 27.1440000534058 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.228371 0.352200 0.167967 0.074496
0.046948 0.048384 0.041364 0.034985 [error]
Peak 0.035980 0.025923 0.013470 0.007372
0.008787 0.009240 0.007876 0.006912 [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 7.11e-08 1.23e-07 1.62e-07 4.34e-07 4.74e-07 7.90e-07 erg/cm2
Error 1.89e-08 2.13e-08 4.04e-08 2.26e-07 9.65e-08 2.63e-07 erg/cm2
Peak flux Power-law 3.22e-01 2.04e-01 8.33e-02 4.61e-02 6.33e-01 6.56e-01 ph/cm2/s
Error 1.17e-01 6.99e-02 4.72e-02 5.22e-02 2.03e-01 2.13e-01 ph/cm2/s
Fluence Cutoff-PL 7.07e-08 1.25e-07 1.62e-07 3.25e-07 4.67e-07 6.75e-07 erg/cm2
Error 1.97e-08 2.76e-08 4.40e-08 3.45e-07 1.13e-07 3.57e-07 erg/cm2
Peak flux Cutoff-PL 2.88e-01 2.78e-01 7.95e-02 4.44e-03 6.50e-01 6.49e-01 ph/cm2/s
Error 1.32e-01 1.02e-01 7.45e-02 2.35e-02 1.99e-01 2.00e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.88e-01 2.77e-01 8.14e-02 5.70e-03 6.51e-01 6.47e-01 ph/cm2/s
Error 1.33e-01 1.02e-01 7.38e-02 -------- 1.99e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.602 0.302 - - 1.75e-03 3.28e-04 67.380 57
CPL 1.493 1.232 198.1 0.0 2.03e-03 7.75e-03 67.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.284 0.551 - - 3.65e-03 1.66e-03 54.490 57
CPL 0.067 3.074 34.2 0.0 8.29e-02 0.00e+00 51.090 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: 8.000000 sec.
T50 in the 50-300 keV band: 4.096000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 28.912 -1.768 27.144
T90 25.984 -0.904 25.080
T50 11.280 1.896 13.176
Peak 1.000 9.308 10.308
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
181.0521 +53.1791 0.0221 20.4 130.6 0.8287 8.7 TRIG_01164180
------------------------------------------
Foreground time interval of the image:
-1.768 27.144 (delta_t = 28.912 [sec])
Background time interval of the image:
-239.352 -218.442 (delta_t = 20.910 [sec])
-217.352 -206.222 (delta_t = 11.130 [sec])
-205.352 -1.768 (delta_t = 203.584 [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 -1.768 sec. to 27.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60155 ( -0.298541 0.304623 )
Norm@50keV : 1.75166E-03 ( -0.000331985 0.000324833 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.38 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 57 degrees of freedom
# Null hypothesis probability = 1.634847e-01
Photon flux (15-150 keV) in 28.91 sec: 0.225205 ( -0.0388386 0.0388551 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.73508e-07 ( -9.5183e-08 9.77389e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.768 sec. to 27.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49278 ( -1.56296 0.901858 )
Epeak [keV] : 198.127 ( -210.291 -210.291 )
Norm@50keV : 2.02530E-03 ( -0.000580932 0.0149194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.36 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 56 degrees of freedom
# Null hypothesis probability = 1.422393e-01
Photon flux (15-150 keV) in 28.91 sec: 0.224423 ( -0.038821 0.03939 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.67064e-07 ( -1.23113e-07 1.02954e-07 ) ergs/cm2
Band function
Time interval is from -1.768 sec. to 27.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99036 ( -5.68579 -4.99036 )
beta : -1.93358 ( -0.574695 0.412213 )
Epeak [keV] : 27.2540 ( -7.38677 5.39949 )
Norm@50keV : 130.492 ( -21.9275 785.63 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.45 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 55 degrees of freedom
# Null hypothesis probability = 2.032051e-01
Photon flux (15-150 keV) in 28.91 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] : 10.9942 (-2.17086 2.8944)
R^2/D10^2 : 7.61451E-02 (-0.0441899 0.0958043)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.41 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 57 degrees of freedom
# Null hypothesis probability = 6.055341e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.559e-08 2.027e-08
25- 50 1.571e-07 4.523e-08
50-150 1.072e-07 4.922e-08
15-150 3.199e-07 8.683e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 164.183 (-91.5132 -163.039)
Norm : 0.926596 (-0.16652 0.235416)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.823e-08 3.919e-08
25- 50 1.281e-07 7.096e-08
50-150 2.621e-07 1.519e-07
15-150 4.584e-07 2.626e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.12484 (-2.39056 2.37042)
R1^2/D10^2 : 0.197257 (-0.105827 0.34616)
kT2 [keV] : 64.0371 (-98.2898 -98.2899)
R2^2/D10^2 : 1.94202E-04 (-6.67509e-05 0.00359051)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.090e-08 4.141e-08
25- 50 1.394e-07 7.166e-08
50-150 2.703e-07 1.626e-07
15-150 4.807e-07 2.472e-07
Peak spectrum fit
Power-law model
Time interval is from 9.308 sec. to 10.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28430 ( -0.476788 0.625896 )
Norm@50keV : 3.65401E-03 ( -0.00167304 0.00164154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.49 using 59 PHA bins.
# Reduced chi-squared = 0.9560 for 57 degrees of freedom
# Null hypothesis probability = 5.698346e-01
Photon flux (15-150 keV) in 1 sec: 0.632694 ( -0.202729 0.203473 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.47222e-08 ( -1.32151e-08 1.41086e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.308 sec. to 10.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.72786E-02 ( -4.11338 2.034 )
Epeak [keV] : 34.1505 ( )
Norm@50keV : 8.29228E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.09 using 59 PHA bins.
# Reduced chi-squared = 0.9124 for 56 degrees of freedom
# Null hypothesis probability = 6.606687e-01
Photon flux (15-150 keV) in 1 sec: 0.650111 ( -0.198535 0.199654 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.32996e-08 ( -1.20225e-08 1.40529e-08 ) ergs/cm2
Band function
Time interval is from 9.308 sec. to 10.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.160008 ( -1.88006 5.00588 )
beta : -9.37162 ( 9.37166 19.3713 )
Epeak [keV] : 34.6460 ( -15.3558 18.1137 )
Norm@50keV : 7.06796E-02 ( -0.0708961 496.415 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.11 using 59 PHA bins.
# Reduced chi-squared = 0.9293 for 55 degrees of freedom
# Null hypothesis probability = 6.240118e-01
Photon flux (15-150 keV) in 1 sec: 0.651416 ( 6.34858 -0.200331 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37266e-08 ( -3.37196e-08 -1.24506e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.80334 (-2.75144 3.4992)
R^2/D10^2 : 0.544604 (-0.543716 1.74734)
(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 8.120e-09 5.085e-09
25- 50 1.667e-08 1.020e-08
50-150 5.940e-09 4.512e-09
15-150 3.073e-08 1.952e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 42.7775 (-21.0531 49.1608)
Norm : 4.19554 (-1.64182 2.92477)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.843e-09 4.842e-09
25- 50 1.332e-08 7.715e-09
50-150 1.107e-08 8.776e-09
15-150 3.424e-08 2.116e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.05994 (-5.08373 -5.08373)
R1^2/D10^2 : 2.33551 (-2.35925 -2.35925)
kT2 [keV] : 12.2216 (-12.3275 -12.3275)
R2^2/D10^2 : 0.102602 (-0.101628 1.4975)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.201e-09 7.635e-09
25- 50 1.444e-08 8.390e-09
50-150 9.658e-09 7.945e-09
15-150 3.330e-08 1.981e-08
Plot creation:
Sat Apr 15 18:35:30 EDT 2023