batgrbproduct analysis for trigger=1209371
batgrbproduct Analysis for Trigger=1209371
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 Jan 18 03:01:57 EST 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1209371/GCN5_download_cron
======================================================================
Trigger: 01209371 Segment: 000
BAT Trigger Time: 727171080 [s; MET]
Trigger Stop: 727171144 [s; MET]
UTC: 2024-01-17T07:57:27.253880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.761419952634 Dec: -15.9644330255217 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.9
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.9
Flight Position: [ source = BAT ]
RA: 245.761419952634 Dec: -15.9644330255217 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.757663072635 Dec: -15.9936490704279 [deg; J2000]
{ 16h 23m 01.8s , -15d 59' 37.1" }
+/- 1.68211972230044 [arcmin] (estimated 90% radius based on SNR)
+/- 0.62817701867096 [arcmin] (formal 1-sigma fit error)
SNR: 14.4699043954994
Angular difference between Flight and Ground position is 1.766306 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.960295 0.079472 -0.017362 0.042613
0.058964 0.052672 0.043614 0.036760 [error]
Peak 1.960295 0.079472 -0.017362 0.042613
0.058964 0.052672 0.043614 0.036760 [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 5.60e-07 6.91e-08 3.68e-09 2.06e-10 6.33e-07 6.33e-07 erg/cm2
Error 6.07e-08 1.82e-08 2.28e-09 2.23e-10 6.63e-08 6.63e-08 erg/cm2
Peak flux Power-law 3.10e-01 2.24e-02 5.97e-04 1.63e-05 3.33e-01 3.33e-01 ph/cm2/s
Error 3.44e-02 5.64e-03 3.62e-04 1.71e-05 3.53e-02 3.53e-02 ph/cm2/s
Fluence Cutoff-PL 5.92e-07 3.06e-08 1.24e-12 6.31e-23 6.23e-07 6.23e-07 erg/cm2
Error 6.69e-08 2.00e-08 1.18e-10 0.00e+00 6.69e-08 6.69e-08 erg/cm2
Peak flux Cutoff-PL 3.25e-01 1.08e-02 2.31e-07 5.99e-18 3.35e-01 3.35e-01 ph/cm2/s
Error 3.82e-02 6.61e-03 2.13e-05 0.00e+00 3.77e-02 3.77e-02 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.16e-01 1.87e-02 4.02e-05 2.87e-07 3.34e-01 3.33e-01 ph/cm2/s
Error 3.58e-02 -------- -------- 7.84e-07 3.81e-02 3.62e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.231 0.502 - - 6.42e-05 3.28e-05 47.570 57
CPL 1.000 0.000 50.0 0.0 1.65e-03 0.00e+00 257.730 56
The chi2 of BB fit is 39.69 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 6.231 0.502 - - 6.42e-05 3.28e-05 47.570 57
CPL 1.000 0.000 50.0 0.0 1.65e-03 0.00e+00 257.730 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.7577 -15.9936 0.0133 0.2 -76.2 2.0858 14.5 TRIG_01209371
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.23050 ( -0.49069 0.513324 )
Norm@50keV : 6.41597E-05 ( -2.63138e-05 3.92092e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.57 using 59 PHA bins.
# Reduced chi-squared = 0.8346 for 57 degrees of freedom
# Null hypothesis probability = 8.087939e-01
Photon flux (15-150 keV) in 64 sec: 0.333126 ( -0.0353206 0.0353385 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33389e-07 ( -6.6329e-08 6.6343e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.65006E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 257.73 using 59 PHA bins.
# Reduced chi-squared = 4.6024 for 56 degrees of freedom
# Null hypothesis probability = 1.179810e-27
Photon flux (15-150 keV) in 64 sec: 0.335454 ( -0.03776 0.037611 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2265e-07 ( -6.71744e-08 6.6592e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.71589 ( )
beta : -8.40496 ( )
Epeak [keV] : 6.42156 ( )
Norm@50keV : 4.94360E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 172.47 using 59 PHA bins.
# Reduced chi-squared = 3.1359 for 55 degrees of freedom
# Null hypothesis probability = 4.794889e-14
Photon flux (15-150 keV) in 64 sec: 0.333846 0.337669 ( ) 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] : 2.39711 (-0.195642 0.221277)
R^2/D10^2 : 229.148 (-115.61 233.59)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.69 using 59 PHA bins.
# Reduced chi-squared = 0.6963 for 57 degrees of freedom
# Null hypothesis probability = 9.606709e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.895e-07 1.466e-07
25- 50 3.645e-08 1.212e-08
50-150 7.561e-12 6.397e-12
15-150 6.260e-07 2.084e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.13294 (-0.495415 0.601003)
Norm : 164.356 (-73.7991 137.088)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.828e-07 1.233e-07
25- 50 4.630e-08 1.591e-08
50-150 8.352e-11 7.285e-11
15-150 6.292e-07 1.599e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.39531 (-0.209956 0.218284)
R1^2/D10^2 : 230.396 (-112.177 247.766)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.43212E-06 (-1.43212e-06 -1.43212e-06)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.904e-07 1.500e-07
25- 50 3.740e-08 1.298e-08
50-150 8.245e-12 7.379e-12
15-150 6.278e-07 1.552e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.23050 ( -0.49069 0.513324 )
Norm@50keV : 6.41597E-05 ( -2.63138e-05 3.92092e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.57 using 59 PHA bins.
# Reduced chi-squared = 0.8346 for 57 degrees of freedom
# Null hypothesis probability = 8.087939e-01
Photon flux (15-150 keV) in 64 sec: 0.333126 ( -0.0353206 0.0353385 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33389e-07 ( -6.6329e-08 6.6343e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.65006E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 257.73 using 59 PHA bins.
# Reduced chi-squared = 4.6024 for 56 degrees of freedom
# Null hypothesis probability = 1.179810e-27
Photon flux (15-150 keV) in 64 sec: 0.335454 ( -0.03776 0.037611 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2265e-07 ( -6.71744e-08 6.6592e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.71589 ( )
beta : -8.40496 ( )
Epeak [keV] : 6.42156 ( )
Norm@50keV : 4.94360E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 172.47 using 59 PHA bins.
# Reduced chi-squared = 3.1359 for 55 degrees of freedom
# Null hypothesis probability = 4.794889e-14
Photon flux (15-150 keV) in 64 sec: 0.333846 0.337669 ( ) 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] : 2.39711 (-0.195642 0.221277)
R^2/D10^2 : 229.148 (-115.61 233.59)
(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 5.895e-07 1.587e-07
25- 50 3.645e-08 1.219e-08
50-150 7.561e-12 6.222e-12
15-150 6.260e-07 1.988e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.13294 (-0.495415 0.601003)
Norm : 164.356 (-73.7991 137.088)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.828e-07 1.460e-07
25- 50 4.630e-08 1.617e-08
50-150 8.352e-11 6.979e-11
15-150 6.292e-07 1.302e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.39531 (-0.209956 0.218284)
R1^2/D10^2 : 230.396 (-112.177 247.766)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.43212E-06 (-1.43212e-06 -1.43212e-06)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.904e-07 1.713e-07
25- 50 3.740e-08 1.277e-08
50-150 8.245e-12 7.649e-12
15-150 6.278e-07 1.721e-07
Plot creation:
Thu Jan 18 03:04:29 EST 2024