batgrbproduct Analysis for Trigger=201721
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Mon Dec 31 14:23:28 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger201721/GCN5_download_cron
======================================================================
Trigger: 00201721 Segment: 000
BAT Trigger Time: 164141424 [s; MET]
Trigger Stop: 164142512 [s; MET]
UTC: 2006-03-15T18:50:22.927000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.200967013278 Dec: -46.1725011399409 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.2
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.2
Flight Position: [ source = BAT ]
RA: 255.200967013278 Dec: -46.1725011399409 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.438626621709 Dec: -46.2065337949795 [deg; J2000]
{ 17h 01m 45.3s , -46d 12' 23.5" }
+/- 5.09821670442193 [arcmin] (estimated 90% radius based on SNR)
+/- 5.01466727866387 [arcmin] (formal 1-sigma fit error)
SNR: 2.96838904776458
RA = 17h 1m 45.3s (255.438627 deg.)
Dec = -46d 12' 24" (-46.206534 deg.)
Angular difference between Flight and Ground position is 10.080528 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 1088 +/-
Measured from: 0
to: 1088 [s; relative to TRIGTIME]
T50: 1088 +/-
Measured from: 0
to: 1088 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1088 second)
Measured from: 0
to: 1088 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1088 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.337460 0.681013 0.148630 -0.138672
0.188203 0.169117 0.146650 0.134056 [error]
Peak 2.337460 0.681013 0.148630 -0.138672
0.188203 0.169117 0.146650 0.134056 [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 6.80e-07 2.50e-07 5.27e-08 1.32e-08 9.91e-07 9.96e-07 erg/cm2
Error 1.13e-07 9.57e-08 4.71e-08 2.45e-08 1.95e-07 2.01e-07 erg/cm2
Peak flux Power-law 2.41e-02 5.08e-03 5.36e-04 6.20e-05 2.98e-02 2.98e-02 ph/cm2/s
Error 4.12e-03 1.84e-03 5.68e-04 1.09e-04 4.81e-03 4.82e-03 ph/cm2/s
Fluence Cutoff-PL 6.80e-07 2.50e-07 5.25e-08 1.31e-08 9.91e-07 9.95e-07 erg/cm2
Error 1.13e-07 9.58e-08 4.70e-08 2.43e-08 1.95e-07 2.01e-07 erg/cm2
Peak flux Cutoff-PL 2.41e-02 5.08e-03 5.34e-04 6.15e-05 2.98e-02 2.98e-02 ph/cm2/s
Error 4.12e-03 1.84e-03 5.66e-04 1.08e-04 4.81e-03 4.82e-03 ph/cm2/s
Fluence Band 7.60e-07 2.40e-07 5.07e-08 1.28e-08 9.97e-07 1.05e-06 erg/cm2
Error 4.08e-08 9.82e-06 3.00e-09 2.40e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.41e-02 5.08e-03 5.34e-04 6.15e-05 2.98e-02 2.98e-02 ph/cm2/s
Error 4.12e-03 1.84e-03 5.66e-04 1.08e-04 4.81e-03 4.82e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.265 0.720 - - 3.82e-05 3.54e-05 58.345 57
CPL 1.836 1.560 1.4 5.9 3.64e-03 1.31e+00 60.703 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.265 0.720 - - 3.82e-05 3.54e-05 58.345 57
CPL 1.836 1.550 1.4 5.9 3.64e-03 1.31e+00 60.703 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 1088.000 0.000 1088.000
T90 1088.000 0.000 1088.000
T50 1088.000 0.000 1088.000
Peak 1088.000 0.000 1088.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.4386 -46.2065 0.0651 3.7 -114.0 2.0382 3.0 TRIG_00201721
------------------------------------------
Foreground time interval of the image:
0.000 94.339 (delta_t = 94.339 [sec])
95.000 963.070 (delta_t = 868.070 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 94.338700
95.000000 963.070000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.26492 ( -0.683836 0.755752 )
Norm@50keV : 3.819500E-05 ( -3.819500E-05 3.258740E-05) )
------------------------------------------------------------
Chi-Squared = 58.34491 using 59 PHA bins.
Reduced chi-squared = 1.023595 for 57 degrees of freedom
Null hypothesis probability = 0.426
Photon flux (15-150 keV) in 962.4 sec: 2.980643E-02 ( -0.00480996 0.00481523 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.91262e-07 ( -1.87927e-07 2.01382e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 94.338700
95.000000 963.070000
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83585 ( -1.48371 1.63723 )
Epeak [keV] : 1.44537 ( -1.22752 10.6465 )
Norm@50keV : 3.640965E-03 ( -3.640965E-03 2.60810 )
------------------------------------------------------------
Chi-Squared = 60.70263 using 59 PHA bins.
but latest trial -0.459136 gives Chi-Squared = 0.214546
Reduced chi-squared = 1.083976 for 56 degrees of freedom
Null hypothesis probability = 0.310
Photon flux (15-150 keV) in 962.4 sec: 2.978519E-02 ( -0.00480741 0.00481265 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.90839e-07 ( -1.87753e-07 2.01536e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 94.338700
95.000000 963.070000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51107 ( -0.585550 0.564766 )
beta : -9.18185 ( -0.818148 19.1816 )
Epeak [keV] : 7.19274 ( -7.18932 6.46900 )
Norm@50keV : 1.739546E-03 ( -0.471548 22.0193 )
------------------------------------------------------------
Chi-Squared = 67.84299 using 59 PHA bins.
Reduced chi-squared = 1.233509 for 55 degrees of freedom
Null hypothesis probability = 0.115
Photon flux (15-150 keV) in 962.4 sec: 2.978537E-02 ( -0.00480749 0.00481254 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.96758e-07 ( -1.6995e-07 3.09854e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 95.000 sec. to 963.070 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.26492 ( -0.683836 0.755752 )
Norm@50keV : 3.819500E-05 ( -3.819500E-05 3.258740E-05) )
------------------------------------------------------------
Chi-Squared = 58.34491 using 59 PHA bins.
Reduced chi-squared = 1.023595 for 57 degrees of freedom
Null hypothesis probability = 0.426
Photon flux (15-150 keV) in 962.4 sec: 2.980643E-02 ( -0.00480996 0.00481523 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.91262e-07 ( -1.87927e-07 2.01382e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 95.000 sec. to 963.070 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83585 ( -1.48371 1.61627 )
Epeak [keV] : 1.44537 ( -1.22752 10.6465 )
Norm@50keV : 3.640965E-03 ( -3.640965E-03 2.60810 )
------------------------------------------------------------
Chi-Squared = 60.70263 using 59 PHA bins.
but latest trial -0.459136 gives Chi-Squared = 0.214546
Reduced chi-squared = 1.083976 for 56 degrees of freedom
Null hypothesis probability = 0.310
Photon flux (15-150 keV) in 962.4 sec: 2.978519E-02 ( -0.00480741 0.00481265 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.90839e-07 ( -1.87753e-07 2.01536e-07 ) ergs/cm2
Band function
Time interval is from 95.000 sec. to 963.070 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51107 ( -0.585550 0.564766 )
beta : -9.18185 ( -0.818148 19.1816 )
Epeak [keV] : 7.19274 ( -7.18932 6.46900 )
Norm@50keV : 1.739546E-03 ( -0.471548 22.0193 )
------------------------------------------------------------
Chi-Squared = 67.84299 using 59 PHA bins.
Reduced chi-squared = 1.233509 for 55 degrees of freedom
Null hypothesis probability = 0.115
Photon flux (15-150 keV) in 962.4 sec: 2.978537E-02 ( -0.00480749 0.00481254 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.96758e-07 ( -1.6995e-07 3.09854e-07 ) ergs/cm2
Plot creation:
Mon Dec 31 14:48:09 EST 2007