batgrbproduct analysis for trigger=770431
batgrbproduct Analysis for Trigger=770431
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 v2.46
Process Start Time (local time): Sun Sep 3 16:58:55 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger770431/GCN5_download_cron
======================================================================
Trigger: 00770431 Segment: 000
BAT Trigger Time: 526075256 [s; MET]
Trigger Stop: 526075592 [s; MET]
UTC: 2017-09-02T20:00:36.375020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.894962307382 Dec: -57.2126198218771 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.61
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.61
Flight Position: [ source = BAT ]
RA: 233.894962307382 Dec: -57.2126198218771 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.896347348079 Dec: -57.2098381474037 [deg; J2000]
{ 15h 35m 35.1s , -57d 12' 35.4" }
+/- 3.16511337029527 [arcmin] (estimated 90% radius based on SNR)
+/- 2.23469169207251 [arcmin] (formal 1-sigma fit error)
SNR: 5.86511544616237
Angular difference between Flight and Ground position is 0.172861 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 99.3319999575615 +/- 38.9083531309661
Measured from: 474.444000124931
to: 573.776000082493 [s; relative to TRIGTIME]
T50: 99.3319999575615 +/- 41.5748957347519
Measured from: 474.444000124931
to: 573.776000082493 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 562.259999990463
to: 563.259999990463 [s; relative to TRIGTIME]
Total Fluence
Measured from: 474.444000005722
to: 573.776000022888 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.024121 -0.463503 -0.362754 -0.515022
0.089619 0.102100 0.089021 0.106080 [error]
Peak 0.017762 0.012615 -0.009646 0.020183
0.010531 0.012564 0.010969 0.013735 [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 1.79e-07 2.87e-07 3.47e-07 8.23e-07 1.05e-06 1.64e-06 erg/cm2
Error 4.41e-08 4.61e-08 8.81e-08 4.35e-07 2.05e-07 5.18e-07 erg/cm2
Peak flux Power-law 2.39e-02 2.10e-02 1.27e-02 1.16e-02 6.26e-02 6.92e-02 ph/cm2/s
Error 6.00e-03 3.40e-03 3.12e-03 5.69e-03 1.01e-02 1.14e-02 ph/cm2/s
Fluence Cutoff-PL 1.75e-07 2.95e-07 3.48e-07 5.51e-07 1.03e-06 1.37e-06 erg/cm2
Error 4.88e-08 5.71e-08 9.24e-08 6.55e-07 2.27e-07 6.70e-07 erg/cm2
Peak flux Cutoff-PL 2.32e-02 2.16e-02 1.28e-02 8.49e-03 6.20e-02 6.61e-02 ph/cm2/s
Error 6.69e-03 4.11e-03 3.26e-03 8.95e-03 1.04e-02 1.36e-02 ph/cm2/s
Fluence Band 1.73e-07 2.94e-07 3.47e-07 5.32e-07 1.02e-06 1.35e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.35e-02 2.14e-02 1.28e-02 9.66e-03 6.23e-02 6.74e-02 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 0.000 0.000 0.0 0.0 0.00e+00 0.00e+00 0.000 0
The chi2 of BB fit is 55.61 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 0.000 0.000 0.0 0.0 0.00e+00 0.00e+00 0.000 0
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 99.332 474.444 573.776
T90 99.332 474.444 573.776
T50 99.332 474.444 573.776
Peak 1.000 562.260 563.260
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
233.8963 -57.2098 0.0328 16.8 46.7 1.6119 5.9 TRIG_00770431
------------------------------------------
Foreground time interval of the image:
0.000 243.030 (delta_t = 243.030 [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 474.444 sec. to 573.776 sec.
Usage: bat_spec_fit_sys_xspec12.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
This script tries to add the systematic column to the PHA
file before doing the fitting
script folder: /local/data/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel
Cutoff power-law model
Time interval is from 474.444 sec. to 573.776 sec.
Usage: bat_spec_fit_cutoff_sys_xspec12.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
This script tries to add the systematic column to the PHA
file before doing the fitting
script folder: /local/data/bat2/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel
Band function
Time interval is from 474.444 sec. to 573.776 sec.
Usage: bat_spec_fit_band_sys.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
This script tries to add the systematic column to the PHA
file before doing the fitting
script folder: /local/data/bat2/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel
Single BB
Usage: bat_spec_fit_bb_sys.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Thermal bremsstrahlung (OTTB)
Usage: bat_spec_fit_brems_sys.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Double BB
Usage: bat_spec_fit_2bb_sys.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Peak spectrum fit
Power-law model
Time interval is from 562.260 sec. to 563.260 sec.
Usage: bat_spec_fit_sys_xspec12.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
This script tries to add the systematic column to the PHA
file before doing the fitting
script folder: /local/data/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel
Cutoff power-law model
Time interval is from 562.260 sec. to 563.260 sec.
Usage: bat_spec_fit_cutoff_sys_xspec12.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
This script tries to add the systematic column to the PHA
file before doing the fitting
script folder: /local/data/bat2/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel
Band function
Time interval is from 562.260 sec. to 563.260 sec.
Usage: bat_spec_fit_band_sys.sh (pha file) (response file) (script folder) (folder of taka's xspec lmodel)
This script tries to add the systematic column to the PHA
file before doing the fitting
script folder: /local/data/bat2/BATtools/battools/bin/GRB_spec_fit_v2
folder of taka's xspec lmodel: /local/data/bat1/prebascript/xspec_taka_lmodel
Single BB
Usage: bat_spec_fit_bb_sys.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Thermal bremsstrahlung (OTTB)
Usage: bat_spec_fit_brems_sys.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Double BB
Usage: bat_spec_fit_2bb_sys.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Plot creation:
Sun Sep 3 17:12:45 EDT 2017