batgrbproduct Analysis for Trigger=341001
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): Sat Jan 24 09:12:29 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger341001/GCN5_download_cron
======================================================================
Trigger: 00341001 Segment: 000
BAT Trigger Time: 254486984 [s; MET]
Trigger Stop: 254487048 [s; MET]
UTC: 2009-01-24T10:49:39.558040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.244020331404 Dec: -61.8794774044985 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.64
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.64
Flight Position: [ source = BAT ]
RA: 170.244020331404 Dec: -61.8794774044985 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.166435719148 Dec: -61.8890201538837 [deg; J2000]
{ 11h 20m 39.9s , -61d 53' 20.5" }
+/- 3.32582386300006 [arcmin] (estimated 90% radius based on SNR)
+/- 1.60017377484833 [arcmin] (formal 1-sigma fit error)
SNR: 5.46446979682398
Angular difference between Flight and Ground position is 2.267214 arcmin
Partial Coding Fraction: 0.71875 [ 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 0.262735 0.236232 -0.036856 0.036903
0.047356 0.046558 0.040887 0.036336 [error]
Peak 0.262735 0.236232 -0.036856 0.036903
0.047356 0.046558 0.040887 0.036336 [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 7.58e-08 7.19e-08 4.75e-08 4.87e-08 2.15e-07 2.43e-07 erg/cm2
Error 2.10e-08 2.24e-08 2.72e-08 5.17e-08 7.07e-08 1.00e-07 erg/cm2
Peak flux Power-law 3.91e-02 2.07e-02 6.83e-03 2.91e-03 6.82e-02 6.96e-02 ph/cm2/s
Error 1.10e-02 6.24e-03 3.80e-03 3.35e-03 1.76e-02 1.81e-02 ph/cm2/s
Fluence Cutoff-PL 7.27e-08 1.07e-07 1.52e-08 4.51e-11 1.95e-07 1.96e-07 erg/cm2
Error 2.24e-08 2.47e-08 1.62e-08 7.72e-10 4.82e-08 4.85e-08 erg/cm2
Peak flux Cutoff-PL 3.61e-02 3.13e-02 2.52e-03 3.97e-06 7.00e-02 6.99e-02 ph/cm2/s
Error 1.06e-02 8.42e-03 2.98e-03 6.64e-05 1.60e-02 1.60e-02 ph/cm2/s
Fluence Band 7.78e-08 1.13e-07 1.14e-08 7.91e-11 1.90e-07 2.00e-07 erg/cm2
Error 3.28e-08 7.07e-09 7.92e-10 4.39e-08 7.91e-08 0.00e+00 erg/cm2
Peak flux Band 3.89e-02 2.74e-02 4.66e-03 1.19e-04 7.11e-02 7.05e-02 ph/cm2/s
Error 1.17e-02 6.97e-03 2.83e-03 1.04e-03 1.67e-02 1.68e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.584 0.510 - - 3.30e-04 1.43e-04 70.075 57
CPL -2.481 0.000 28.1 4.8 8.66e-01 2.16e+00 60.124 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.584 0.510 - - 3.30e-04 1.43e-04 70.075 57
CPL -2.481 0.000 28.1 4.8 8.66e-01 2.16e+00 60.124 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
170.1664 -61.8890 0.0352 25.9 -52.4 0.5136 5.5 TRIG_00341001
------------------------------------------
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: 2.58448 ( -0.443630 0.575534 )
Norm@50keV : 3.299229E-04 ( -1.416562E-04 1.438471E-04) )
------------------------------------------------------------
Chi-Squared = 70.07504 using 59 PHA bins.
Reduced chi-squared = 1.229387 for 57 degrees of freedom
Null hypothesis probability = 0.114
Photon flux (15-150 keV) in 64.00 sec: 6.822000E-02 ( -0.0174644 0.0176957 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14967e-07 ( -6.71955e-08 7.41504e-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: -2.48065 ( )
Epeak [keV] : 28.0967 ( -4.54023 4.97647 )
Norm@50keV : 0.866395 ( -1.80631 2.50585 )
------------------------------------------------------------
Chi-Squared = 60.12418 using 59 PHA bins.
Reduced chi-squared = 1.073646 for 56 degrees of freedom
Null hypothesis probability = 0.329
Photon flux (15-150 keV) in 64.00 sec: 6.996512E-02 ( -0.0160085 0.0160473 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95208e-07 ( -4.7687e-08 4.88032e-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 : -1.34179 ( -0.524747 5.01391 )
beta : -9.33579 ( -0.664207 6.67642 )
Epeak [keV] : 16.9537 ( -3.50246 125.947 )
Norm@50keV : 2.388285E-03 ( -2.98085 19.6825 )
------------------------------------------------------------
Chi-Squared = 65.47031 using 59 PHA bins.
Reduced chi-squared = 1.190369 for 55 degrees of freedom
Null hypothesis probability = 0.158
Photon flux (15-150 keV) in 64.00 sec: 7.110833E-02 ( -0.0167297 0.0167297 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8956e-07 ( -4.43859e-08 4.33261e-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: 2.58448 ( -0.443630 0.575534 )
Norm@50keV : 3.299229E-04 ( -1.416562E-04 1.438471E-04) )
------------------------------------------------------------
Chi-Squared = 70.07504 using 59 PHA bins.
Reduced chi-squared = 1.229387 for 57 degrees of freedom
Null hypothesis probability = 0.114
Photon flux (15-150 keV) in 64.00 sec: 6.822000E-02 ( -0.0174644 0.0176957 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.14967e-07 ( -6.71955e-08 7.41504e-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: -2.48065 ( )
Epeak [keV] : 28.0967 ( -4.54023 4.97647 )
Norm@50keV : 0.866395 ( -1.80631 2.50585 )
------------------------------------------------------------
Chi-Squared = 60.12418 using 59 PHA bins.
Reduced chi-squared = 1.073646 for 56 degrees of freedom
Null hypothesis probability = 0.329
Photon flux (15-150 keV) in 64.00 sec: 6.996512E-02 ( -0.0160085 0.0160473 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95208e-07 ( -4.7687e-08 4.88032e-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 : -1.34179 ( -7.17000 5.01391 )
beta : -9.33579 ( -0.664207 6.67610 )
Epeak [keV] : 16.9537 ( -24.6910 125.947 )
Norm@50keV : 2.388285E-03 ( -2.98085 19.6825 )
------------------------------------------------------------
Chi-Squared = 65.47031 using 59 PHA bins.
Reduced chi-squared = 1.190369 for 55 degrees of freedom
Null hypothesis probability = 0.158
Photon flux (15-150 keV) in 64.00 sec: 7.110833E-02 ( -0.0167297 0.0167297 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8956e-07 ( -4.43859e-08 4.33261e-08 ) ergs/cm2
Plot creation:
Sat Jan 24 09:25:16 EST 2009