batgrbproduct Analysis for Trigger=211957
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): Tue Jan 1 13:59:28 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger211957/GCN5_download_cron
======================================================================
Trigger: 00211957 Segment: 000
BAT Trigger Time: 170353711.168 [s; MET]
Trigger Stop: 170353711.68 [s; MET]
UTC: 2006-05-26T16:28:29.950920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 232.845565859311 Dec: 0.244218930890226 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.05
Image Trigger?: NO
Rate S/N Ratio: 20.3469899493758 [ if not an image trigger ]
Image S/N Ratio: 9.05
Flight Position: [ source = BAT ]
RA: 232.845565859311 Dec: 0.244218930890226 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 232.833412577164 Dec: 0.293756459261441 [deg; J2000]
{ 15h 31m 20.0s , +00d 17' 37.5" }
+/- 1.4129712098263 [arcmin] (estimated 90% radius based on SNR)
+/- 0.551742650905229 [arcmin] (formal 1-sigma fit error)
SNR: 18.5627458527778
RA = 15h 31m 20.0s (232.833413 deg.)
Dec = 0d 17' 38" (0.293756 deg.)
Angular difference between Flight and Ground position is 3.060392 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 298.16400000453 +/- 23.0482186783306
Measured from: 0.351999998092651
to: 298.516000002623 [s; relative to TRIGTIME]
T50: 249.140000015497 +/- 8.14483396822134
Measured from: 7.51999998092651
to: 256.659999996424 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.143999993801117
to: 1.14399999380112 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.41600000858307
to: 310.17199999094 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.052539 0.731765 0.616272 0.138949
0.086268 0.082917 0.073944 0.066813 [error]
Peak 0.041691 0.080864 0.067119 0.017341
0.006672 0.007300 0.006541 0.005085 [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 3.01e-07 4.00e-07 3.91e-07 6.84e-07 1.32e-06 1.78e-06 erg/cm2
Error 5.02e-08 4.17e-08 7.92e-08 2.88e-07 1.70e-07 3.63e-07 erg/cm2
Peak flux Power-law 4.86e-01 5.43e-01 4.33e-01 5.74e-01 1.67e+00 2.04e+00 ph/cm2/s
Error 8.97e-02 6.23e-02 5.30e-02 1.44e-01 1.76e-01 2.16e-01 ph/cm2/s
Fluence Cutoff-PL 3.01e-07 4.01e-07 3.91e-07 6.78e-07 1.32e-06 1.77e-06 erg/cm2
Error 5.02e-08 4.18e-08 7.94e-08 2.86e-07 1.70e-07 3.60e-07 erg/cm2
Peak flux Cutoff-PL 3.91e-01 5.92e-01 4.79e-01 2.21e-01 1.61e+00 1.68e+00 ph/cm2/s
Error 1.11e-01 7.71e-02 6.62e-02 1.69e-01 1.84e-01 2.45e-01 ph/cm2/s
Fluence Band 2.80e-07 3.99e-07 4.21e-07 7.57e-07 1.34e-06 2.02e-06 erg/cm2
Error 3.79e-08 4.32e-08 5.62e-08 2.43e-07 1.46e-07 0.00e+00 erg/cm2
Peak flux Band 3.85e-01 5.98e-01 4.69e-01 3.20e-01 1.61e+00 1.77e+00 ph/cm2/s
Error 1.47e-01 8.32e-02 7.10e-02 2.13e-01 1.83e-01 2.93e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.034 0.238 - - 4.57e-04 6.39e-05 55.985 57
CPL 2.058 0.000 27.9 0.0 4.09e-04 0.00e+00 55.117 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.324 0.172 - - 1.40e-02 1.44e-03 70.493 57
CPL 0.247 0.916 84.8 59.6 4.68e-02 6.13e-02 65.180 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: 260.288000 sec.
T50 in the 50-300 keV band: 247.168000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 311.588 -1.416 310.172
T90 298.164 0.352 298.516
T50 249.140 7.520 256.660
Peak 1.000 0.144 1.144
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
232.8334 +0.2938 0.0104 24.9 52.1 0.7367 18.6 TRIG_00211957
------------------------------------------
Foreground time interval of the image:
-1.416 9.133 (delta_t = 10.549 [sec])
Background time interval of the image:
-239.168 -1.416 (delta_t = 237.752 [sec])
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
Time interval is from -1.416 sec. to 310.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03361 ( -0.231200 0.244150 )
Norm@50keV : 4.573343E-04 ( -6.524689E-05 6.250149E-05) )
------------------------------------------------------------
Chi-Squared = 55.98485 using 59 PHA bins.
Reduced chi-squared = 0.9821904 for 57 degrees of freedom
Null hypothesis probability = 0.513
Photon flux (15-150 keV) in 311.6 sec: 6.968773E-02 ( -0.00732176 0.00733375 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31702e-06 ( -1.68149e-07 1.7219e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.416 sec. to 310.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05834 ( )
Epeak [keV] : 27.9452 ( )
Norm@50keV : 4.093983E-04 ( )
------------------------------------------------------------
Chi-Squared = 55.11698 using 59 PHA bins.
Reduced chi-squared = 0.9842318 for 56 degrees of freedom
Null hypothesis probability = 0.508
Photon flux (15-150 keV) in 311.6 sec: 6.965528E-02 ( -0.00731899 0.00733084 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31654e-06 ( -1.6799e-07 1.72365e-07 ) ergs/cm2
Band function
Time interval is from -1.416 sec. to 310.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47049 ( -8.52951 6.47049 )
beta : -2.02308 ( -0.265949 0.220972 )
Epeak [keV] : 13.6834 ( -13.5834 321.697 )
Norm@50keV : 1.596415E-03 ( -1.596415E-03 2.78166 )
------------------------------------------------------------
Chi-Squared = 55.99163 using 59 PHA bins.
Reduced chi-squared = 1.018030 for 55 degrees of freedom
Null hypothesis probability = 0.437
Photon flux (15-150 keV) in 311.6 sec: 6.965546E-02 ( -0.00731904 0.00733082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34066e-06 ( -1.39619e-07 1.5226e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32408 ( -0.172306 0.172251 )
Norm@50keV : 1.396464E-02 ( -1.436819E-03 1.435596E-03) )
------------------------------------------------------------
Chi-Squared = 70.49341 using 59 PHA bins.
Reduced chi-squared = 1.236726 for 57 degrees of freedom
Null hypothesis probability = 0.108
Photon flux (15-150 keV) in 1.000 sec: 1.67363 ( -0.17562 0.17593 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37187e-07 ( -1.5551e-08 1.57e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.247095 ( -1.01409 0.817105 )
Epeak [keV] : 84.8397 ( -19.6874 99.5583 )
Norm@50keV : 4.675206E-02 ( -2.767417E-02 9.495316E-02) )
------------------------------------------------------------
Chi-Squared = 65.17950 using 59 PHA bins.
Reduced chi-squared = 1.163920 for 56 degrees of freedom
Null hypothesis probability = 0.188
Photon flux (15-150 keV) in 1.000 sec: 1.61082 ( -0.18425 0.18289 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29292e-07 ( -1.7466e-08 1.7111e-08 ) ergs/cm2
Band function
Time interval is from 0.144 sec. to 1.144 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.024191E-02 ( -0.985647 2.39447 )
beta : -2.12187 ( -7.87813 0.680926 )
Epeak [keV] : 76.1413 ( -35.2773 96.0880 )
Norm@50keV : 6.057311E-02 ( -3.982898E-02 2.40178 )
------------------------------------------------------------
Chi-Squared = 64.97847 using 59 PHA bins.
Reduced chi-squared = 1.181427 for 55 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 1.000 sec: 1.60764 ( -0.18471 0.18059 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28979e-07 ( -1.7193e-08 1.732e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 14:17:00 EST 2008