batgrbproduct Analysis for Trigger=335971
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 v2.42
Process Start Time (local time): Sun Nov 30 07:01:29 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger335971/GCN5_download_cron
======================================================================
Trigger: 00335971 Segment: 000
BAT Trigger Time: 249687704 [s; MET]
Trigger Stop: 249687768 [s; MET]
UTC: 2008-11-29T21:41:40.704960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 324.330287797152 Dec: 21.5164666308289 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.08
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.08
Flight Position: [ source = BAT ]
RA: 324.330287797152 Dec: 21.5164666308289 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 324.267150792812 Dec: 21.4539713515895 [deg; J2000]
{ 21h 37m 04.1s , +21d 27' 14.3" }
+/- 3.5243076284094 [arcmin] (estimated 90% radius based on SNR)
+/- 2.17326022299402 [arcmin] (formal 1-sigma fit error)
SNR: 5.03018972550959
Angular difference between Flight and Ground position is 5.146445 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.162034 0.240643 0.016757 -0.018635
0.041698 0.041978 0.037391 0.033270 [error]
Peak 0.162034 0.240643 0.016757 -0.018635
0.041698 0.041978 0.037391 0.033270 [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 5.27e-08 6.67e-08 6.16e-08 9.96e-08 2.15e-07 2.81e-07 erg/cm2
Error 1.75e-08 1.93e-08 3.05e-08 9.42e-08 7.39e-08 1.37e-07 erg/cm2
Peak flux Power-law 2.69e-02 1.89e-02 8.70e-03 5.62e-03 5.72e-02 6.00e-02 ph/cm2/s
Error 9.10e-03 5.36e-03 4.18e-03 5.99e-03 1.57e-02 1.69e-02 ph/cm2/s
Fluence Cutoff-PL 5.00e-08 9.61e-08 2.16e-08 1.56e-10 1.68e-07 1.68e-07 erg/cm2
Error 1.61e-08 2.69e-08 2.20e-08 2.37e-09 4.58e-08 4.57e-08 erg/cm2
Peak flux Cutoff-PL 2.45e-02 2.76e-02 3.56e-03 1.41e-05 5.56e-02 5.56e-02 ph/cm2/s
Error 8.10e-03 7.40e-03 3.99e-03 1.98e-04 1.39e-02 1.39e-02 ph/cm2/s
Fluence Band 5.17e-08 9.94e-08 2.14e-08 9.34e-10 1.69e-07 1.92e-07 erg/cm2
Error 2.85e-08 1.41e-08 1.93e-08 5.61e-08 9.40e-08 0.00e+00 erg/cm2
Peak flux Band 2.52e-02 2.85e-02 3.52e-03 1.03e-04 5.51e-02 5.81e-02 ph/cm2/s
Error 7.77e-03 4.69e-03 1.30e-03 1.39e-02 1.61e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.115 0.490 - - 3.61e-04 1.35e-04 50.736 57
CPL -2.500 0.000 32.0 5.8 4.11e-01 1.02e+00 43.153 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.115 0.490 - - 3.61e-04 1.35e-04 50.736 57
CPL -2.500 0.000 32.0 5.8 4.11e-01 1.02e+00 43.153 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
324.2672 +21.4540 0.0383 27.3 -157.8 0.4168 5.0 TRIG_00335971
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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.
- 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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11519 ( -0.454350 0.525884 )
Norm@50keV : 3.605698E-04 ( -1.356100E-04 1.351031E-04) )
------------------------------------------------------------
Chi-Squared = 50.73606 using 59 PHA bins.
Reduced chi-squared = 0.8901063 for 57 degrees of freedom
Null hypothesis probability = 0.708
Photon flux (15-150 keV) in 64.00 sec: 5.715825E-02 ( -0.0156765 0.0157116 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14696e-07 ( -7.07891e-08 7.70381e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49995 ( )
Epeak [keV] : 31.9621 ( -5.31813 6.36542 )
Norm@50keV : 0.411269 ( -0.842439 1.19004 )
------------------------------------------------------------
Chi-Squared = 43.15330 using 59 PHA bins.
Reduced chi-squared = 0.7705947 for 56 degrees of freedom
Null hypothesis probability = 0.896
Photon flux (15-150 keV) in 64.00 sec: 5.561856E-02 ( -0.0138809 0.0138753 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67933e-07 ( -4.44602e-08 4.70976e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15896 ( -4.91008 1.227903E-02) )
beta : -3.71420 ( -6.28128 13.1881 )
Epeak [keV] : 29.2737 ( -4.74103 38.0096 )
Norm@50keV : 1.609095E-03 ( -12.4758 57.0011 )
------------------------------------------------------------
Chi-Squared = 47.92762 using 59 PHA bins.
Reduced chi-squared = 0.8714112 for 55 degrees of freedom
Null hypothesis probability = 0.739
Photon flux (15-150 keV) in 64.00 sec: 5.511160E-02 ( -0.0136584 0.014107 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68911e-07 ( -4.44966e-08 6.76954e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11519 ( -0.454350 0.525884 )
Norm@50keV : 3.605698E-04 ( -1.356100E-04 1.351031E-04) )
------------------------------------------------------------
Chi-Squared = 50.73606 using 59 PHA bins.
Reduced chi-squared = 0.8901063 for 57 degrees of freedom
Null hypothesis probability = 0.708
Photon flux (15-150 keV) in 64.00 sec: 5.715825E-02 ( -0.0156765 0.0157116 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14696e-07 ( -7.07891e-08 7.70381e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49995 ( )
Epeak [keV] : 31.9621 ( -5.31813 6.36542 )
Norm@50keV : 0.411269 ( -0.842439 1.19004 )
------------------------------------------------------------
Chi-Squared = 43.15330 using 59 PHA bins.
Reduced chi-squared = 0.7705947 for 56 degrees of freedom
Null hypothesis probability = 0.896
Photon flux (15-150 keV) in 64.00 sec: 5.561856E-02 ( -0.0138809 0.0138753 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67933e-07 ( -4.44602e-08 4.70976e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15896 ( -14.8694 1.227903E-02) )
beta : -3.71420 ( -6.28128 1.26476 )
Epeak [keV] : 29.2737 ( -4.74043 38.0096 )
Norm@50keV : 1.609095E-03 ( -12.4758 57.0011 )
------------------------------------------------------------
Chi-Squared = 47.92762 using 59 PHA bins.
Reduced chi-squared = 0.8714112 for 55 degrees of freedom
Null hypothesis probability = 0.739
Photon flux (15-150 keV) in 64.00 sec: 5.511160E-02 ( -0.0136584 0.014107 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68911e-07 ( -4.44966e-08 6.76954e-08 ) ergs/cm2
Plot creation:
Sun Nov 30 07:24:30 EST 2008