batgrbproduct Analysis for Trigger=517876
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 10 downlinks after the trigger.
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BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sat Mar 17 04:55:13 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger517876/GCN5_download_cron
======================================================================
Trigger: 00517876 Segment: 000
BAT Trigger Time: 353591448 [s; MET]
Trigger Stop: 353592240 [s; MET]
UTC: 2012-03-16T11:50:40.001680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 270.259659475152 Dec: -25.0873139436239 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 13.77
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.77
Flight Position: [ source = BAT ]
RA: 270.259659475152 Dec: -25.0873139436239 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 270.337705116417 Dec: -25.1201189891305 [deg; J2000]
{ 18h 01m 21.0s , -25d 07' 12.4" }
+/- 4.6049802190189 [arcmin] (estimated 90% radius based on SNR)
+/- 3.17824217431565 [arcmin] (formal 1-sigma fit error)
SNR: 3.43281293967697
Angular difference between Flight and Ground position is 4.674967 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 0.143999934196472 +/- 0.0312409780678008
Measured from: 808.088000118732
to: 808.232000052929 [s; relative to TRIGTIME]
T50: 0.0999999642372131 +/- 0.0609261752673085
Measured from: 808.108000099659
to: 808.208000063896 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 807.663999974728
to: 808.663999974728 [s; relative to TRIGTIME]
Total Fluence
Measured from: 808.083999991417
to: 808.240000009537 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.012000 0.004332 0.001826 0.001527
0.002208 0.001881 0.001595 0.001354 [error]
Peak 0.022578 0.004906 -0.001694 0.004676
0.005352 0.004863 0.004154 0.003591 [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 5.38e-08 1.29e-08 1.59e-09 2.20e-10 6.85e-08 6.85e-08 erg/cm2
Error 1.71e-08 1.39e-08 4.14e-09 1.61e-09 2.92e-08 2.95e-08 erg/cm2
Peak flux Power-law 5.14e-02 7.12e-03 4.40e-04 2.89e-05 5.90e-02 5.90e-02 ph/cm2/s
Error 1.60e-02 7.42e-03 1.10e-03 1.91e-04 2.06e-02 2.06e-02 ph/cm2/s
Fluence Cutoff-PL 5.96e-08 7.11e-09 6.42e-09 1.81e-12 2.59e-21 6.71e-08 erg/cm2
Error 2.04e-08 9.63e-10 0.00e+00 1.75e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.74e-02 3.89e-03 4.77e-07 4.07e-16 6.12e-02 6.11e-02 ph/cm2/s
Error 1.85e-02 6.61e-03 8.41e-04 0.00e+00 1.93e-02 1.95e-02 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 60.79 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 0.156 808.084 808.240
T90 0.144 808.088 808.232
T50 0.100 808.108 808.208
Peak 1.000 807.664 808.664
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
270.3377 -25.1201 0.0560 15.9 -143.9 0.2265 3.4 TRIG_00517876
------------------------------------------
Foreground time interval of the image:
0.000 36.280 (delta_t = 36.280 [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 808.084 sec. to 808.240 sec.
Usage: bat_spec_fit_sys_xspec12.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Cutoff power-law model
Time interval is from 808.084 sec. to 808.240 sec.
Usage: bat_spec_fit_cutoff_sys_xspec12.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Band function
Time interval is from 808.084 sec. to 808.240 sec.
Usage: bat_spec_fit_band_sys.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
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 807.664 sec. to 808.664 sec.
Usage: bat_spec_fit_sys_xspec12.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Cutoff power-law model
Time interval is from 807.664 sec. to 808.664 sec.
Usage: bat_spec_fit_cutoff_sys_xspec12.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
Band function
Time interval is from 807.664 sec. to 808.664 sec.
Usage: bat_spec_fit_band_sys.sh (pha file) (response file)
This script tries to add the systematic column to the PHA
file before doing the fitting
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:
Sat Mar 17 05:07:12 EDT 2012