batgrbproduct analysis for trigger=846740
batgrbproduct Analysis for Trigger=846740
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): Mon Jul 9 12:17:48 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger846740/GCN5_download_cron
======================================================================
Trigger: 00846740 Segment: 000
BAT Trigger Time: 552749640 [s; MET]
Trigger Stop: 552749728 [s; MET]
UTC: 2018-07-08T13:33:38.769060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 198.918909891462 Dec: 41.8972108811188 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.93
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.93
Flight Position: [ source = BAT ]
RA: 198.918909891462 Dec: 41.8972108811188 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 198.900945930262 Dec: 41.8738272304255 [deg; J2000]
{ 13h 15m 36.2s , +41d 52' 25.8" }
+/- 4.14277473743776 [arcmin] (estimated 90% radius based on SNR)
+/- 2.45642827693538 [arcmin] (formal 1-sigma fit error)
SNR: 3.99276397278939
Angular difference between Flight and Ground position is 1.616278 arcmin
Partial Coding Fraction: 0.3671875 [ including projection effects ]
Duration
T90: 1.15199983119965 +/- 0.0640000104904175
Measured from: 140.904000163078
to: 142.055999994278 [s; relative to TRIGTIME]
T50: 0.575999975204468 +/- 0.064
Measured from: 141.09600007534
to: 141.672000050545 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 141.427999973297
to: 142.427999973297 [s; relative to TRIGTIME]
Total Fluence
Measured from: 140.840000033379
to: 142.120000004768 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.020253 -0.009096 -0.023845 -0.007887
0.006186 0.006425 0.005738 0.005234 [error]
Peak -0.007554 -0.001785 -0.012029 -0.001991
0.005431 0.005616 0.004962 0.004552 [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 1.05e-07 1.28e-07 1.14e-07 1.74e-07 4.07e-07 5.21e-07 erg/cm2
Error 4.41e-08 4.69e-08 7.00e-08 2.36e-07 1.72e-07 3.10e-07 erg/cm2
Peak flux Power-law 3.89e-02 2.64e-02 1.17e-02 7.21e-03 8.05e-02 8.41e-02 ph/cm2/s
Error 1.67e-02 9.48e-03 6.99e-03 9.10e-03 2.80e-02 2.96e-02 ph/cm2/s
Fluence Cutoff-PL 1.05e-07 1.73e-07 1.29e-08 3.25e-12 2.91e-07 2.91e-07 erg/cm2
Error 5.26e-08 7.62e-08 5.01e-08 8.21e-09 1.08e-07 1.08e-07 erg/cm2
Peak flux Cutoff-PL 3.71e-02 3.74e-02 1.63e-03 2.17e-07 7.61e-02 7.61e-02 ph/cm2/s
Error 1.95e-02 1.14e-02 5.50e-03 4.79e-04 2.54e-02 2.54e-02 ph/cm2/s
Fluence Band 1.05e-07 1.74e-07 3.08e-08 3.13e-09 3.14e-07 3.13e-07 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 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 67.73 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 1.280 140.840 142.120
T90 1.152 140.904 142.056
T50 0.576 141.096 141.672
Peak 1.000 141.428 142.428
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
198.9009 +41.8738 0.0481 38.4 -132.1 0.8735 4.0 TRIG_00846740
------------------------------------------
Foreground time interval of the image:
0.000 88.000 (delta_t = 88.000 [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 140.840 sec. to 142.120 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 140.840 sec. to 142.120 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 140.840 sec. to 142.120 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 141.428 sec. to 142.428 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 141.428 sec. to 142.428 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 141.428 sec. to 142.428 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:
Mon Jul 9 12:20:46 EDT 2018