batgrbproduct Analysis for Trigger=350184
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 Aug 11 01:25:44 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/350184
======================================================================
Trigger: 00350184 Segment: 000
BAT Trigger Time: 262166124.032 [s; MET]
Trigger Stop: 262166125.056 [s; MET]
UTC: 2009-04-23T07:55:19.349660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 148.894774542363 Dec: 18.160243227552 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.16
Image Trigger?: NO
Rate S/N Ratio: 11.2694276695846 [ if not an image trigger ]
Image S/N Ratio: 8.16
Flight Position: [ source = BAT ]
RA: 148.894774542363 Dec: 18.160243227552 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 148.889545873269 Dec: 18.1659867533815 [deg; J2000]
{ 09h 55m 33.5s , +18d 09' 57.6" }
+/- 1.06307606410745 [arcmin] (estimated 90% radius based on SNR)
+/- 0.351888139696515 [arcmin] (formal 1-sigma fit error)
SNR: 27.8720763569745
Angular difference between Flight and Ground position is 0.455647 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 9.76800000667572 +/- 1.06172876136085
Measured from: 0.30799999833107
to: 10.0760000050068 [s; relative to TRIGTIME]
T50: 4.84000000357628 +/- 0.4
Measured from: 2.99599999189377
to: 7.83599999547005 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.61599999666214
to: 4.61599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.668000012636185
to: 11.7400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.369549 0.513486 0.272211 0.034315
0.019339 0.020579 0.017684 0.014653 [error]
Peak 0.061842 0.084085 0.052852 0.006485
0.005985 0.006447 0.005645 0.004337 [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 1.27e-07 1.94e-07 2.21e-07 4.82e-07 6.85e-07 1.02e-06 erg/cm2
Error 1.03e-08 1.00e-08 1.70e-08 7.59e-08 4.01e-08 9.19e-08 erg/cm2
Peak flux Power-law 6.25e-01 5.81e-01 3.74e-01 3.72e-01 1.73e+00 1.95e+00 ph/cm2/s
Error 7.98e-02 4.95e-02 4.56e-02 8.74e-02 1.47e-01 1.72e-01 ph/cm2/s
Fluence Cutoff-PL 1.11e-07 2.15e-07 2.20e-07 1.18e-07 6.25e-07 6.64e-07 erg/cm2
Error 1.21e-08 1.36e-08 2.01e-08 6.51e-08 4.58e-08 7.87e-08 erg/cm2
Peak flux Cutoff-PL 5.94e-01 6.14e-01 3.84e-01 2.14e-01 1.72e+00 1.81e+00 ph/cm2/s
Error 8.92e-02 4.94e-02 4.96e-02 1.56e-01 1.49e-01 2.14e-01 ph/cm2/s
Fluence Band 1.05e-07 2.22e-07 2.07e-07 2.67e-07 6.36e-07 8.06e-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 5.94e-01 6.14e-01 3.84e-01 2.14e-01 1.72e+00 1.83e+00 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 1.808 0.092 - - 6.00e-03 3.43e-04 63.770 57
CPL 0.765 0.470 53.2 7.0 2.21e-02 1.41e-02 45.130 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 1.634 0.144 - - 1.33e-02 1.26e-03 45.600 57
CPL 1.199 0.515 84.5 -28.6 2.31e-02 1.87e-02 43.730 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: 12.672000 sec.
T50 in the 50-300 keV band: 5.120000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.408 -0.668 11.740
T90 9.768 0.308 10.076
T50 4.840 2.996 7.836
Peak 1.000 3.616 4.616
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
148.8895 +18.1660 0.0069 25.0 -172.1 1.1414 27.9 TRIG_00350184
------------------------------------------
Foreground time interval of the image:
-0.668 10.669 (delta_t = 11.337 [sec])
Background time interval of the image:
-30.331 -0.668 (delta_t = 29.663 [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 -0.668 sec. to 11.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80836 ( -0.0913879 0.092886 )
Norm@50keV : 6.00073E-03 ( -0.000344027 0.000341768 )
------------------------------------------------------------
# Chi-Squared = 63.77 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.506275e-01
Photon flux (15-150 keV) in 12.41 sec: 0.829581 ( -0.0436872 0.0437359 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.85383e-07 ( -3.99252e-08 4.01919e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.668 sec. to 11.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.765154 ( -0.4969 0.44221 )
Epeak [keV] : 53.2310 ( -5.8306 8.26023 )
Norm@50keV : 2.20699E-02 ( -0.00926183 0.0189547 )
------------------------------------------------------------
# Chi-Squared = 45.13 using 59 PHA bins.
# Reduced chi-squared = 0.8058 for 56 degrees of freedom
# Null hypothesis probability = 8.505047e-01
Photon flux (15-150 keV) in 12.41 sec: 0.789115 ( -0.04641 0.046486 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24661e-07 ( -4.52891e-08 4.62707e-08 ) ergs/cm2
Band function
Time interval is from -0.668 sec. to 11.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.164856 ( -0.859984 1.78021 )
beta : -2.36814 ( 2.37089 0.309138 )
Epeak [keV] : 44.6379 ( -9.23925 12.2848 )
Norm@50keV : 5.30247E-02 ( -0.058896 0.836635 )
------------------------------------------------------------
# Chi-Squared = 42.98 using 59 PHA bins.
# Reduced chi-squared = 0.7814 for 55 degrees of freedom
# Null hypothesis probability = 8.805301e-01
Photon flux (15-150 keV) in 12.41 sec: 0.784549 ( -0.045549 0.043885 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36355e-07 ( -4.41746e-08 4.19284e-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
Peak spectrum fit
Power-law model
Time interval is from 3.616 sec. to 4.616 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63408 ( -0.141667 0.145712 )
Norm@50keV : 1.33481E-02 ( -0.00126714 0.00125049 )
------------------------------------------------------------
# Chi-Squared = 45.60 using 59 PHA bins.
# Reduced chi-squared = 0.8001 for 57 degrees of freedom
# Null hypothesis probability = 8.609302e-01
Photon flux (15-150 keV) in 1 sec: 1.73390 ( -0.14666 0.14667 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24348e-07 ( -1.26053e-08 1.27437e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.616 sec. to 4.616 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19924 ( -0.61927 0.410494 )
Epeak [keV] : 84.5430 ( -27.3438 -84.543 )
Norm@50keV : 2.31373E-02 ( -0.0104707 0.0269738 )
------------------------------------------------------------
# Chi-Squared = 43.73 using 59 PHA bins.
# Reduced chi-squared = 0.7809 for 56 degrees of freedom
# Null hypothesis probability = 8.834380e-01
Photon flux (15-150 keV) in 1 sec: 1.71512 ( -0.14871 0.14857 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20044e-07 ( -1.3825e-08 1.3879e-08 ) ergs/cm2
Band function
Time interval is from 3.616 sec. to 4.616 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19725 ( -0.409015 0.505767 )
beta : -9.35688 ( 9.99424 19.9942 )
Epeak [keV] : 86.1015 ( -25.3575 -86.1272 )
Norm@50keV : 2.30219E-02 ( -0.00807682 0.00985842 )
------------------------------------------------------------
# Chi-Squared = 43.74 using 59 PHA bins.
# Reduced chi-squared = 0.7953 for 55 degrees of freedom
# Null hypothesis probability = 8.626257e-01
Photon flux (15-150 keV) in 1 sec: 1.71510 ( -0.14869 0.14859 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20878e-07 ( -1.3469e-08 1.3406e-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 11:46:26 EDT 2011