batgrbproduct analysis for trigger=1079966
batgrbproduct Analysis for Trigger=1079966
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): Mon Oct 18 21:15:39 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1079966/GCN5_download_cron
======================================================================
Trigger: 01079966 Segment: 000
BAT Trigger Time: 656207144 [s; MET]
Trigger Stop: 656207208 [s; MET]
UTC: 2021-10-17T23:45:16.079620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.978648668875 Dec: -15.8421742107669 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.63
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.63
Flight Position: [ source = BAT ]
RA: 244.978648668875 Dec: -15.8421742107669 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.968531303773 Dec: -15.7213944291306 [deg; J2000]
{ 16h 19m 52.4s , -15d 43' 17.0" }
+/- 0.96462720169041 [arcmin] (estimated 90% radius based on SNR)
+/- 0.382940722363644 [arcmin] (formal 1-sigma fit error)
SNR: 32.0229948109765
Angular difference between Flight and Ground position is 7.270293 arcmin
Partial Coding Fraction: 0.8046875 [ 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 2.955736 0.374211 -0.046534 -0.011994
0.071419 0.060361 0.049743 0.043068 [error]
Peak 2.955736 0.374211 -0.046534 -0.011994
0.071419 0.060361 0.049743 0.043068 [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 9.27e-07 1.74e-07 1.60e-08 1.59e-09 1.12e-06 1.12e-06 erg/cm2
Error 8.85e-08 2.95e-08 6.52e-09 1.12e-09 9.36e-08 9.36e-08 erg/cm2
Peak flux Power-law 5.06e-01 5.54e-02 2.54e-03 1.21e-04 5.64e-01 5.64e-01 ph/cm2/s
Error 5.00e-02 8.88e-03 1.01e-03 8.25e-05 5.03e-02 5.03e-02 ph/cm2/s
Fluence Cutoff-PL 9.26e-07 1.29e-07 3.98e-10 1.79e-15 1.06e-06 1.06e-06 erg/cm2
Error 9.59e-08 3.77e-08 2.02e-09 4.37e-12 1.01e-07 1.01e-07 erg/cm2
Peak flux Cutoff-PL 4.99e-01 4.37e-02 7.21e-05 1.69e-10 5.42e-01 5.42e-01 ph/cm2/s
Error 5.49e-02 1.15e-02 3.48e-04 3.92e-07 5.54e-02 5.54e-02 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 5.450 0.356 - - 2.37e-04 7.76e-05 66.490 57
CPL 1.000 0.000 50.0 0.0 3.15e-03 0.00e+00 365.030 56
The chi2 of BB fit is 58.32 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 5.450 0.356 - - 2.37e-04 7.76e-05 66.490 57
CPL 1.000 0.000 50.0 0.0 3.15e-03 0.00e+00 365.030 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
244.9685 -15.7214 0.0060 17.4 -72.7 4.2270 32.0 TRIG_01079966
------------------------------------------
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: 5.44970 ( -0.349045 0.362855 )
Norm@50keV : 2.36594E-04 ( -6.83216e-05 8.68513e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.49 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.825069e-01
Photon flux (15-150 keV) in 64 sec: 0.564012 ( -0.0502099 0.0504433 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11848e-06 ( -9.35149e-08 9.36e-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 : 3.14835E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 365.03 using 59 PHA bins.
# Reduced chi-squared = 6.5183 for 56 degrees of freedom
# Null hypothesis probability = 6.649316e-47
Photon flux (15-150 keV) in 64 sec: 0.542310 ( -0.055947 0.054758 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05608e-06 ( -1.01587e-07 9.99552e-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 : 0.360346 ( -2.38596 1.86189 )
beta : -8.47277 ( 8.43982 2.45486 )
Epeak [keV] : 8.80865 ( -1.75983 1.224 )
Norm@50keV : 11.5550 ( -11.6322 408.011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.86 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.701542e-01
Photon flux (15-150 keV) in 64 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] : 2.90536 (-0.20575 0.229071)
R^2/D10^2 : 94.1428 (-39.7167 68.7975)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.32 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.267695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.205e-07 1.717e-07
25- 50 1.198e-07 2.566e-08
50-150 1.481e-10 9.826e-11
15-150 1.040e-06 1.504e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.41964 (-0.575989 0.683973)
Norm : 96.0002 (-33.9561 53.6225)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.313e-07 1.350e-07
25- 50 1.405e-07 3.078e-08
50-150 1.077e-09 6.384e-10
15-150 1.073e-06 1.709e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.95042 (-0.233623 0.25625)
R1^2/D10^2 : 83.4854 (-38.1692 71.9275)
kT2 [keV] : 0.391658 (-0.396122 3.98381)
R2^2/D10^2 : 4.80908E+13 (-3.05028e+13 2.45524e+18)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.002e-07 1.860e-07
25- 50 1.237e-07 3.168e-08
50-150 1.739e-10 1.091e-10
15-150 1.024e-06 2.035e-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: 5.44970 ( -0.349045 0.362855 )
Norm@50keV : 2.36594E-04 ( -6.83216e-05 8.68513e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.49 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.825069e-01
Photon flux (15-150 keV) in 64 sec: 0.564012 ( -0.0502099 0.0504433 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11848e-06 ( -9.35149e-08 9.36e-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 : 3.14835E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 365.03 using 59 PHA bins.
# Reduced chi-squared = 6.5183 for 56 degrees of freedom
# Null hypothesis probability = 6.649316e-47
Photon flux (15-150 keV) in 64 sec: 0.542310 ( -0.055947 0.054758 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05608e-06 ( -1.01587e-07 9.99552e-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 : 0.360346 ( -2.38596 1.86189 )
beta : -8.47277 ( 8.43982 2.45486 )
Epeak [keV] : 8.80865 ( -1.75983 1.224 )
Norm@50keV : 11.5550 ( -11.6322 407.775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.86 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 55 degrees of freedom
# Null hypothesis probability = 3.701542e-01
Photon flux (15-150 keV) in 64 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] : 2.90536 (-0.20575 0.229071)
R^2/D10^2 : 94.1428 (-39.7167 68.7975)
(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 9.205e-07 1.826e-07
25- 50 1.198e-07 2.637e-08
50-150 1.481e-10 9.620e-11
15-150 1.040e-06 1.686e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.41964 (-0.575989 0.683973)
Norm : 96.0002 (-33.9561 53.6225)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.313e-07 1.408e-07
25- 50 1.405e-07 3.094e-08
50-150 1.077e-09 6.574e-10
15-150 1.073e-06 1.466e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.95042 (-0.233623 0.25625)
R1^2/D10^2 : 83.4854 (-38.1692 71.9275)
kT2 [keV] : 0.391658 (-0.396122 3.98381)
R2^2/D10^2 : 4.80908E+13 (-3.05028e+13 6.57262e+18)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.002e-07 1.684e-07
25- 50 1.237e-07 3.181e-08
50-150 1.739e-10 1.149e-10
15-150 1.024e-06 1.869e-07
Plot creation:
Mon Oct 18 21:21:33 EDT 2021