batgrbproduct analysis for trigger=1082569
batgrbproduct Analysis for Trigger=1082569
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 Nov 6 12:09:39 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1082569/GCN5_download_cron
======================================================================
Trigger: 01082569 Segment: 000
BAT Trigger Time: 657800871.376 [s; MET]
Trigger Stop: 657800871.408 [s; MET]
UTC: 2021-11-05T10:27:23.348440 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 271.07719808787 Dec: 41.3987171816772 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: NO
Rate S/N Ratio: 6.32455532033676 [ if not an image trigger ]
Image S/N Ratio: 7.05
Flight Position: [ source = BAT ]
RA: 271.07719808787 Dec: 41.3987171816772 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 270.968564752747 Dec: 41.4848585351206 [deg; J2000]
{ 18h 03m 52.5s , +41d 29' 05.5" }
+/- 4.07558248574829 [arcmin] (estimated 90% radius based on SNR)
+/- 2.48421761390214 [arcmin] (formal 1-sigma fit error)
SNR: 4.08713353065327
Angular difference between Flight and Ground position is 7.112450 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 0.031999945640564 +/-
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
T50: 0.031999945640564 +/-
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.031999945640564 second)
Measured from: -5.96046447753906e-08
to: 0.0319998860359192 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.031999945640564 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006095 0.002580 -0.000725 -0.000547
0.001353 0.001425 0.000827 0.000714 [error]
Peak 0.006095 0.002580 -0.000725 -0.000547
0.001353 0.001425 0.000827 0.000714 [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 0.00e+002.54e-10 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 3.13e-10 1.72e-10 9.28e-11 6.93e-09 5.63e-10 7.01e-09 erg/cm2
Peak flux Power-law 0.00e+002.71e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+003.40e-01 0.00e+003.40e-01 ph/cm2/s
Error 3.33e-01 1.02e-01 2.34e-02 5.20e-01 4.23e-01 4.24e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 5.89e-10 3.63e-10 1.35e-10 -------- 9.13e-10 9.04e-10 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 5.97e-01 2.48e-01 1.76e-02 -------- 7.79e-01 3.10e+01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 1.500 0.000 - - 0.00e+00 1.20e-03 53.170 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 53.170 56
The chi2 of BB fit is 46.98 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 1.500 0.000 - - 0.00e+00 1.20e-03 53.170 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 53.170 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 0.032 0.000 0.032
T90 0.032 0.000 0.032
T50 0.032 0.000 0.032
Peak 0.032 -0.000 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
270.9686 +41.4849 0.0469 20.5 -164.8 0.0089 4.1 TRIG_01082569
------------------------------------------
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-239.376 -221.226 (delta_t = 18.150 [sec])
-220.376 -163.746 (delta_t = 56.630 [sec])
-162.376 -149.816 (delta_t = 12.560 [sec])
-148.376 -21.170 (delta_t = 127.206 [sec])
-20.376 -7.376 (delta_t = 13.000 [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 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.00239358 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.17 using 59 PHA bins.
# Reduced chi-squared = 0.9329 for 57 degrees of freedom
# Null hypothesis probability = 6.193526e-01
Photon flux (15-150 keV) in 0.032 sec: 0.0 0.340108 ( -0.34 0.5067 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 1.12651e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.17 using 59 PHA bins.
# Reduced chi-squared = 0.9495 for 56 degrees of freedom
# Null hypothesis probability = 5.824980e-01
Photon flux (15-150 keV) in 0.032 sec: 0.0 1.70392 1.71365 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38138 ( 0.98395 0.98395 )
beta : -9.37167 ( 2.5 2.5 )
Epeak [keV] : 21.3691 ( -80 -80 )
Norm@50keV : 2078.49 ( -2087.32 1581.84 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.69 using 59 PHA bins.
# Reduced chi-squared = 0.8125 for 55 degrees of freedom
# Null hypothesis probability = 8.383758e-01
Photon flux (15-150 keV) in 0.032 sec: 0.0 ( ) 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] : 4.53358 (-1.30162 1.24747)
R^2/D10^2 : 14.7230 (-14.711 48.1272)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.98 using 59 PHA bins.
# Reduced chi-squared = 0.8242 for 57 degrees of freedom
# Null hypothesis probability = 8.255026e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.615e-10 5.254e-10
25- 50 3.875e-10 3.302e-10
50-150 9.583e-12 1.395e-11
15-150 1.159e-09 8.347e-10
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.52596 (-6.28022 11.4762)
Norm : 23.6566 (-22.1064 116.382)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.665e-10 3.878e-10
25- 50 1.879e-10 2.019e-10
50-150 1.126e-11 2.845e-11
15-150 6.657e-10 5.946e-10
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.53265 (-1.3008 1.24836)
R1^2/D10^2 : 14.7251 (-11.9845 48.2298)
kT2 [keV] : 0.289830 (-0.28983 -0.28983)
R2^2/D10^2 : 2.97388E-04 (-0.000297365 -0.000297365)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.00239358 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.17 using 59 PHA bins.
# Reduced chi-squared = 0.9329 for 57 degrees of freedom
# Null hypothesis probability = 6.193526e-01
Photon flux (15-150 keV) in 0.032 sec: 0.0 0.340108 ( -0.34 0.5067 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 1.12651e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.17 using 59 PHA bins.
# Reduced chi-squared = 0.9495 for 56 degrees of freedom
# Null hypothesis probability = 5.824980e-01
Photon flux (15-150 keV) in 0.032 sec: 0.0 1.70392 1.71365 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38138 ( 0.98395 0.98395 )
beta : -9.37167 ( 2.5 2.5 )
Epeak [keV] : 21.3691 ( -80 -80 )
Norm@50keV : 2078.49 ( -2087.32 1581.84 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.69 using 59 PHA bins.
# Reduced chi-squared = 0.8125 for 55 degrees of freedom
# Null hypothesis probability = 8.383758e-01
Photon flux (15-150 keV) in 0.032 sec: 0.0 ( ) 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] : 4.53358 (-1.30162 1.24747)
R^2/D10^2 : 14.7230 (-14.711 48.1272)
(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 7.615e-10 5.302e-10
25- 50 3.875e-10 3.296e-10
50-150 9.583e-12 1.613e-11
15-150 1.159e-09 9.038e-10
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.52596 (-6.28022 11.4762)
Norm : 23.6566 (-22.1064 116.382)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.665e-10 4.034e-10
25- 50 1.879e-10 2.243e-10
50-150 1.126e-11 1.968e-11
15-150 6.657e-10 5.938e-10
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.53265 (-1.3008 1.24836)
R1^2/D10^2 : 14.7251 (-11.9845 48.2298)
kT2 [keV] : 0.289830 (-0.28983 -0.28983)
R2^2/D10^2 : 2.97388E-04 (-0.000297365 -0.000297365)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Sat Nov 6 12:15:29 EDT 2021