batgrbproduct Analysis for Trigger=210886
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 13:20:00 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger210886/GCN5_download_cron
======================================================================
Trigger: 00210886 Segment: 000
BAT Trigger Time: 169839160 [s; MET]
Trigger Stop: 169839480 [s; MET]
UTC: 2006-05-20T17:32:38.794880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.998812361477 Dec: -45.2089494640119 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.78
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.78
Flight Position: [ source = BAT ]
RA: 251.998812361477 Dec: -45.2089494640119 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.087651524889 Dec: -45.1861397066007 [deg; J2000]
{ 16h 48m 21.0s , -45d 11' 10.1" }
+/- 3.34994033938911 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52604641109946 [arcmin] (formal 1-sigma fit error)
SNR: 5.4083578466264
RA = 16h 48m 21.0s (252.087652 deg.)
Dec = -45d 11' 10" (-45.186140 deg.)
Angular difference between Flight and Ground position is 3.997672 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.050390 0.098980 0.060115 0.025797
0.031858 0.028299 0.023776 0.020666 [error]
Peak 0.050390 0.098980 0.060115 0.025797
0.031858 0.028299 0.023776 0.020666 [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 1.73e-08 3.48e-08 5.45e-08 1.88e-07 1.52e-07 3.08e-07 erg/cm2
Error 1.18e-08 1.42e-08 2.35e-08 2.12e-07 5.79e-08 2.23e-07 erg/cm2
Peak flux Power-law 1.68e-02 1.85e-02 1.45e-02 1.86e-02 5.67e-02 6.84e-02 ph/cm2/s
Error 1.17e-02 7.75e-03 6.04e-03 1.87e-02 2.09e-02 2.43e-02 ph/cm2/s
Fluence Cutoff-PL 1.73e-08 3.48e-08 5.45e-08 1.87e-07 1.52e-07 2.90e-07 erg/cm2
Error 1.18e-08 1.42e-08 2.36e-08 2.10e-07 5.80e-08 2.21e-07 erg/cm2
Peak flux Cutoff-PL 1.68e-02 1.85e-02 1.45e-02 1.85e-02 5.67e-02 6.83e-02 ph/cm2/s
Error 1.17e-02 7.75e-03 6.05e-03 1.86e-02 2.09e-02 2.42e-02 ph/cm2/s
Fluence Band 1.57e-08 3.87e-08 5.24e-08 1.32e-07 1.44e-07 2.50e-07 erg/cm2
Error 1.03e-08 1.97e-08 2.40e-08 2.48e-07 4.21e-08 2.26e-07 erg/cm2
Peak flux Band 1.50e-02 2.03e-02 1.40e-02 1.49e-02 5.60e-02 6.70e-02 ph/cm2/s
Error 1.10e-02 9.18e-03 5.77e-03 2.05e-02 2.10e-02 2.73e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.353 0.712 - - 4.70e-04 1.64e-04 59.198 57
CPL 1.268 5.429 387.9 0.0 5.25e-04 1.64e-04 59.267 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.353 0.712 - - 4.70e-04 1.64e-04 59.198 57
CPL 1.268 5.317 387.9 0.0 5.25e-04 1.64e-04 59.267 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.0877 -45.1861 0.0354 19.7 14.7 0.3109 5.4 TRIG_00210886
------------------------------------------
Foreground time interval of the image:
0.000 33.069 (delta_t = 33.069 [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
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35341 ( -0.751138 0.672412 )
Norm@50keV : 4.704889E-04 ( -1.636432E-04 1.634975E-04) )
------------------------------------------------------------
Chi-Squared = 59.19833 using 59 PHA bins.
Reduced chi-squared = 1.038567 for 57 degrees of freedom
Null hypothesis probability = 0.395
Photon flux (15-150 keV) in 33.07 sec: 5.672037E-02 ( -0.020744 0.0209895 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51843e-07 ( -5.70768e-08 5.8819e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26841 ( -3.37989 7.47885 )
Epeak [keV] : 387.857 ( )
Norm@50keV : 5.246282E-04 ( -1.633895E-04 1.654214E-04) )
------------------------------------------------------------
Chi-Squared = 59.26683 using 59 PHA bins.
Reduced chi-squared = 1.058336 for 56 degrees of freedom
Null hypothesis probability = 0.357
Photon flux (15-150 keV) in 33.07 sec: 5.670240E-02 ( -0.0207363 0.0209824 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51837e-07 ( -5.70732e-08 5.88431e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.862424 ( -14.8528 0.147190 )
beta : -1.44267 ( -2.09453 1.07388 )
Epeak [keV] : 79.2628 ( -37.2019 9962.70 )
Norm@50keV : 9.716946E-04 ( -0.678066 6.53333 )
------------------------------------------------------------
Chi-Squared = 59.07228 using 59 PHA bins.
Reduced chi-squared = 1.074041 for 55 degrees of freedom
Null hypothesis probability = 0.329
Photon flux (15-150 keV) in 33.07 sec: 5.600561E-02 ( -0.0211447 0.0208814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4378e-07 ( -5.32847e-08 3.09813e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35341 ( -0.751138 0.672412 )
Norm@50keV : 4.704889E-04 ( -1.636432E-04 1.634975E-04) )
------------------------------------------------------------
Chi-Squared = 59.19833 using 59 PHA bins.
Reduced chi-squared = 1.038567 for 57 degrees of freedom
Null hypothesis probability = 0.395
Photon flux (15-150 keV) in 33.07 sec: 5.672037E-02 ( -0.020744 0.0209895 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51843e-07 ( -5.70768e-08 5.8819e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26841 ( -3.37989 7.25405 )
Epeak [keV] : 387.857 ( )
Norm@50keV : 5.246282E-04 ( -1.633895E-04 1.654214E-04) )
------------------------------------------------------------
Chi-Squared = 59.26683 using 59 PHA bins.
Reduced chi-squared = 1.058336 for 56 degrees of freedom
Null hypothesis probability = 0.357
Photon flux (15-150 keV) in 33.07 sec: 5.670240E-02 ( -0.0207363 0.0209824 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51837e-07 ( -5.70732e-08 5.88431e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.069 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.862424 ( -14.8528 0.147190 )
beta : -1.44267 ( -2.09453 1.07388 )
Epeak [keV] : 79.2628 ( -37.2019 9962.70 )
Norm@50keV : 9.716946E-04 ( -0.678066 6.53333 )
------------------------------------------------------------
Chi-Squared = 59.07228 using 59 PHA bins.
Reduced chi-squared = 1.074041 for 55 degrees of freedom
Null hypothesis probability = 0.329
Photon flux (15-150 keV) in 33.07 sec: 5.600561E-02 ( -0.0211447 0.0208814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4378e-07 ( -5.32847e-08 3.09813e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 13:23:48 EST 2008