batgrbproduct analysis for trigger=1071768
batgrbproduct Analysis for Trigger=1071768
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 Sep 4 19:24:39 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1071768/GCN5_download_cron
======================================================================
Trigger: 01071768 Segment: 000
BAT Trigger Time: 652370712 [s; MET]
Trigger Stop: 652370776 [s; MET]
UTC: 2021-09-03T14:04:44.336980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.550433321611 Dec: 34.9432118681029 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.59
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.59
Flight Position: [ source = BAT ]
RA: 299.550433321611 Dec: 34.9432118681029 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.544034537224 Dec: 34.9681205225444 [deg; J2000]
{ 19h 58m 10.6s , +34d 58' 05.2" }
+/- 1.55301514100964 [arcmin] (estimated 90% radius based on SNR)
+/- 0.609585565359793 [arcmin] (formal 1-sigma fit error)
SNR: 16.2184838092466
Angular difference between Flight and Ground position is 1.527286 arcmin
Partial Coding Fraction: 0.8828125 [ 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 0.655521 0.839287 0.424328 0.097616
0.061947 0.062141 0.054647 0.051060 [error]
Peak 0.655521 0.839287 0.424328 0.097616
0.061947 0.062141 0.054647 0.051060 [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 2.11e-07 3.17e-07 3.57e-07 7.62e-07 1.11e-06 1.65e-06 erg/cm2
Error 2.75e-08 2.84e-08 5.15e-08 2.19e-07 1.20e-07 2.73e-07 erg/cm2
Peak flux Power-law 1.07e-01 8.86e-02 4.99e-02 4.14e-02 2.64e-01 2.87e-01 ph/cm2/s
Error 1.42e-02 7.95e-03 6.96e-03 1.11e-02 2.37e-02 2.62e-02 ph/cm2/s
Fluence Cutoff-PL 1.97e-07 3.53e-07 3.36e-07 1.76e-07 1.00e-06 1.06e-06 erg/cm2
Error 3.02e-08 3.08e-08 6.58e-08 2.39e-07 1.43e-07 2.83e-07 erg/cm2
Peak flux Cutoff-PL 9.90e-02 9.81e-02 4.81e-02 1.26e-02 2.55e-01 2.58e-01 ph/cm2/s
Error 1.58e-02 1.12e-02 8.60e-03 -------- 2.47e-02 2.77e-02 ph/cm2/s
Fluence Band 1.89e-07 3.68e-07 3.15e-07 4.53e-07 1.04e-06 1.33e-06 erg/cm2
Error 3.25e-08 4.05e-08 -------- -------- 1.25e-07 -------- 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 1.830 0.161 - - 1.89e-03 2.01e-04 59.410 57
CPL 0.936 0.804 48.6 22.3 6.31e-03 9.59e-03 54.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.830 0.161 - - 1.89e-03 2.01e-04 59.410 57
CPL 0.936 0.804 48.6 22.3 6.31e-03 9.59e-03 54.600 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
299.5440 +34.9681 0.0119 22.6 14.7 2.1841 16.2 TRIG_01071768
------------------------------------------
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: 1.83024 ( -0.158671 0.16368 )
Norm@50keV : 1.89195E-03 ( -0.000202355 0.000199417 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.41 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.880174e-01
Photon flux (15-150 keV) in 64 sec: 0.263826 ( -0.02371 0.0237153 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11375e-06 ( -1.19187e-07 1.21427e-07 ) 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: 0.936295 ( -0.894877 0.712347 )
Epeak [keV] : 48.5608 ( -9.56016 35.0506 )
Norm@50keV : 6.31248E-03 ( -0.0038552 0.0153188 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.60 using 59 PHA bins.
# Reduced chi-squared = 0.9750 for 56 degrees of freedom
# Null hypothesis probability = 5.278958e-01
Photon flux (15-150 keV) in 64 sec: 0.254729 ( -0.024629 0.024691 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00204e-06 ( -1.3833e-07 1.46886e-07 ) 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 : 4.63494 ( -4.41215 -4.63494 )
beta : -2.23570 ( -0.300742 0.253772 )
Epeak [keV] : 28.1706 ( -2.85258 2.92706 )
Norm@50keV : 75.1453 ( -6.61905 243.412 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.73 using 59 PHA bins.
# Reduced chi-squared = 0.8678 for 55 degrees of freedom
# Null hypothesis probability = 7.460044e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03568e-06 ( -1.03523e-06 -1.23667e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0727 (-1.01612 1.16576)
R^2/D10^2 : 0.122142 (-0.0416486 0.0611171)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.37 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.260169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.619e-07 2.531e-08
25- 50 4.067e-07 4.387e-08
50-150 2.168e-07 5.283e-08
15-150 7.854e-07 8.576e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.7639 (-22.3468 38.0849)
Norm : 1.22852 (-0.155706 0.187115)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.046e-07 2.950e-08
25- 50 3.404e-07 3.277e-08
50-150 4.954e-07 2.091e-07
15-150 1.040e-06 2.006e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30380 (-1.32559 1.37324)
R1^2/D10^2 : 0.318333 (-0.139306 0.334844)
kT2 [keV] : 25.9580 (-8.52416 25.8364)
R2^2/D10^2 : 2.13019E-03 (-0.00191611 0.00807427)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.977e-07 5.878e-08
25- 50 3.608e-07 1.152e-07
50-150 5.009e-07 2.597e-07
15-150 1.059e-06 4.048e-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: 1.83024 ( -0.158671 0.16368 )
Norm@50keV : 1.89195E-03 ( -0.000202355 0.000199417 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.41 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.880174e-01
Photon flux (15-150 keV) in 64 sec: 0.263826 ( -0.02371 0.0237153 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11375e-06 ( -1.19187e-07 1.21427e-07 ) 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: 0.936295 ( -0.894877 0.712347 )
Epeak [keV] : 48.5608 ( -9.56016 35.0506 )
Norm@50keV : 6.31248E-03 ( -0.0038552 0.0153188 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.60 using 59 PHA bins.
# Reduced chi-squared = 0.9750 for 56 degrees of freedom
# Null hypothesis probability = 5.278958e-01
Photon flux (15-150 keV) in 64 sec: 0.254729 ( -0.024629 0.024691 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00204e-06 ( -1.3833e-07 1.46886e-07 ) 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 : 4.63494 ( -4.41215 -4.63494 )
beta : -2.23570 ( -0.300742 0.253772 )
Epeak [keV] : 28.1706 ( -2.85258 2.92706 )
Norm@50keV : 75.1453 ( -6.61905 243.412 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.73 using 59 PHA bins.
# Reduced chi-squared = 0.8678 for 55 degrees of freedom
# Null hypothesis probability = 7.460044e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03568e-06 ( -1.03523e-06 -1.23667e-07 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0727 (-1.01612 1.16576)
R^2/D10^2 : 0.122142 (-0.0416486 0.0611171)
(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 1.619e-07 2.384e-08
25- 50 4.067e-07 4.397e-08
50-150 2.168e-07 5.382e-08
15-150 7.854e-07 9.120e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.7639 (-22.3468 38.0849)
Norm : 1.22852 (-0.155706 0.187115)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.046e-07 2.694e-08
25- 50 3.404e-07 3.507e-08
50-150 4.954e-07 2.117e-07
15-150 1.040e-06 2.054e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.30380 (-1.32559 1.37323)
R1^2/D10^2 : 0.318333 (-0.139306 0.334844)
kT2 [keV] : 25.9580 (-8.52416 25.8364)
R2^2/D10^2 : 2.13019E-03 (-0.00191611 0.00807427)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.977e-07 6.966e-08
25- 50 3.608e-07 1.218e-07
50-150 5.009e-07 2.570e-07
15-150 1.059e-06 4.274e-07
Plot creation:
Sat Sep 4 19:31:31 EDT 2021