batgrbproduct Analysis for Trigger=361489
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Tue Dec 22 16:19:04 EST 2009
Host Name: heteswift
Current Working Dir: /net/raid16/BAT_GRB_process_2009/361489
======================================================================
Trigger: 00361489 Segment: 000
BAT Trigger Time: 273447030.976 [s; MET]
Trigger Stop: 273447036.48 [s; MET]
UTC: 2009-08-31T21:30:25.929900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 108.278334509616 Dec: -25.1000128821772 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.36
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 8.36
Flight Position: [ source = BAT ]
RA: 108.278334509616 Dec: -25.1000128821772 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 108.329754041423 Dec: -25.155878700815 [deg; J2000]
{ 07h 13m 19.1s , -25d 09' 21.2" }
+/- 3.10447897369979 [arcmin] (estimated 90% radius based on SNR)
+/- 1.3378507120682 [arcmin] (formal 1-sigma fit error)
SNR: 6.02944513253123
Angular difference between Flight and Ground position is 4.363200 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 77.9520000219345 +/- 14.7999221917989
Measured from: 1.11199998855591
to: 79.0640000104904 [s; relative to TRIGTIME]
T50: 53.3120000362396 +/- 27.6332553094131
Measured from: 3.28799998760223
to: 56.6000000238419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.92399996519089
to: 2.92399996519089 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.407999992370605
to: 81.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.178726 0.187652 0.151548 0.083633
0.050343 0.051848 0.045372 0.039819 [error]
Peak 0.014465 0.025402 0.018226 0.008719
0.005729 0.005768 0.005302 0.004438 [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 4.19e-08 8.60e-08 1.38e-07 4.94e-07 3.82e-07 7.60e-07 erg/cm2
Error 2.04e-08 2.47e-08 4.61e-08 3.98e-07 1.13e-07 4.25e-07 erg/cm2
Peak flux Power-law 1.43e-01 1.73e-01 1.52e-01 2.29e-01 5.48e-01 6.97e-01 ph/cm2/s
Error 7.12e-02 5.19e-02 4.39e-02 1.51e-01 1.40e-01 1.85e-01 ph/cm2/s
Fluence Cutoff-PL 4.20e-08 8.62e-08 1.38e-07 4.88e-07 3.82e-07 7.52e-07 erg/cm2
Error 2.00e-08 2.18e-08 3.46e-08 1.13e-07 4.80e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.43e-01 1.73e-01 1.52e-01 2.27e-01 5.48e-01 6.96e-01 ph/cm2/s
Error 7.12e-02 3.89e-02 4.39e-02 1.50e-01 1.39e-01 1.57e-01 ph/cm2/s
Fluence Band 4.14e-08 8.61e-08 1.37e-07 4.80e-07 3.80e-07 7.37e-07 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.38e-01 1.80e-01 1.51e-01 2.16e-01 5.49e-01 6.84e-01 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.319 0.506 - - 4.81e-04 1.25e-04 59.370 57
CPL 1.337 0.510 9999.4 0.0 4.79e-04 6.50e-04 59.390 56
The chi2 of BB fit is which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.188 0.472 - - 4.68e-03 1.15e-03 39.770 57
CPL 2.767 0.000 227.7 0.0 5.66e-04 0.00e+00 39.600 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 80.768 0.408 81.176
T90 77.952 1.112 79.064
T50 53.312 3.288 56.600
Peak 1.000 1.924 2.924
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
108.3298 -25.1559 0.0317 23.4 -39.3 0.5490 6.0 TRIG_00361489
------------------------------------------
Foreground time interval of the image:
0.408 54.525 (delta_t = 54.117 [sec])
Background time interval of the image:
-239.976 0.408 (delta_t = 240.384 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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 0.408 sec. to 81.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31856 ( -0.518068 0.494773 )
Norm@50keV : 4.81227E-04 ( -0.000125247 0.000124187 )
------------------------------------------------------------
# Chi-Squared = 59.37 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.890988e-01
Photon flux (15-150 keV) in 80.77 sec: 5.76124E-02 ( -0.0151449 0.0151759 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.82386e-07 ( -1.11653e-07 1.14491e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.408 sec. to 81.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33712 ( -0.53933 0.481077 )
Epeak [keV] : 9999.36 ( -9999.72 -9999.72 )
Norm@50keV : 4.78960E-04 ( -0.000124478 0.00117518 )
------------------------------------------------------------
# Chi-Squared = 59.39 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 56 degrees of freedom
# Null hypothesis probability = 3.532062e-01
Photon flux (15-150 keV) in 80.77 sec: 5.74511E-02 ( -0.015011 0.0152795 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.81855e-07 ( -1.11105e-07 1.14504e-07 ) ergs/cm2
Band function
Time interval is from 0.408 sec. to 81.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95191 ( -41.7035 -41.7035 )
beta : -1.38516 ( -0.621954 0.565236 )
Epeak [keV] : 24.1162 ( -24.1136 109.646 )
Norm@50keV : 50.2267 ( -50.4129 65.677 )
------------------------------------------------------------
# Chi-Squared = 59.28 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 55 degrees of freedom
# Null hypothesis probability = 3.221770e-01
Photon flux (15-150 keV) in 80.77 sec: 5.730400E-02 ( -0.014922 0.014795 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80048e-07 ( -5.33728e-08 1.09027e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from 1.924 sec. to 2.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18780 ( -0.489848 0.455046 )
Norm@50keV : 4.67875E-03 ( -0.00115271 0.00115399 )
------------------------------------------------------------
# Chi-Squared = 39.77 using 59 PHA bins.
# Reduced chi-squared = 0.6978 for 57 degrees of freedom
# Null hypothesis probability = 9.598052e-01
Photon flux (15-150 keV) in 1 sec: 0.548259 ( -0.1399 0.140331 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7632e-08 ( -1.30278e-08 1.32466e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.924 sec. to 2.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.76698 ( )
Epeak [keV] : 227.727 ( )
Norm@50keV : 5.66355E-04 ( )
------------------------------------------------------------
# Chi-Squared = 39.60 using 59 PHA bins.
# Reduced chi-squared = 0.7072 for 56 degrees of freedom
# Null hypothesis probability = 9.524000e-01
Photon flux (15-150 keV) in 1 sec: 0.548059 ( -0.138683 0.140281 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75043e-08 ( -1.28677e-08 1.33718e-08 ) ergs/cm2
Band function
Time interval is from 1.924 sec. to 2.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87305 ( -17.0217 -17.0217 )
beta : -1.25202 ( -0.543052 0.520749 )
Epeak [keV] : 23.9073 ( -23.9076 52.3147 )
Norm@50keV : 403.914 ( -403.376 357.299 )
------------------------------------------------------------
# Chi-Squared = 39.42 using 59 PHA bins.
# Reduced chi-squared = 0.7167 for 55 degrees of freedom
# Null hypothesis probability = 9.440726e-01
Photon flux (15-150 keV) in 1 sec: 0.548698 ( -0.14393 0.138255 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83615e-08 ( -1.27499e-08 1.19908e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Fri May 27 10:53:30 EDT 2011