batgrbproduct Analysis for Trigger=439550
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 v2.46
Process Start Time (local time): Wed Dec 1 07:37:06 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger439550/GCN5_download_cron
======================================================================
Trigger: 00439550 Segment: 000
BAT Trigger Time: 312824136 [s; MET]
Trigger Stop: 312824712 [s; MET]
UTC: 2010-11-30T15:35:29.580540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 211.975325090801 Dec: -61.9882963739414 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.66
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.66
Flight Position: [ source = BAT ]
RA: 211.975325090801 Dec: -61.9882963739414 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.073063514271 Dec: -61.9124485156679 [deg; J2000]
{ 14h 08m 17.5s , -61d 54' 44.8" }
+/- 4.01312861062893 [arcmin] (estimated 90% radius based on SNR)
+/- 3.70520644186105 [arcmin] (formal 1-sigma fit error)
SNR: 4.17830075261716
Angular difference between Flight and Ground position is 5.321167 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 576 +/-
Measured from: 0
to: 576 [s; relative to TRIGTIME]
T50: 576 +/-
Measured from: 0
to: 576 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 576 second)
Measured from: 0
to: 576 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 576 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.880306 0.509264 -0.034335 -0.020423
0.131778 0.134613 0.119094 0.106556 [error]
Peak 0.880306 0.509264 -0.034335 -0.020423
0.131778 0.134613 0.119094 0.106556 [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 2.32e-07 1.80e-07 9.34e-08 7.02e-08 5.37e-07 5.75e-07 erg/cm2
Error 5.53e-08 6.31e-08 6.53e-08 1.01e-07 1.77e-07 2.26e-07 erg/cm2
Peak flux Power-law 1.35e-02 5.92e-03 1.56e-03 5.07e-04 2.12e-02 2.14e-02 ph/cm2/s
Error 3.00e-03 1.93e-03 1.37e-03 6.62e-04 4.90e-03 5.04e-03 ph/cm2/s
Fluence Cutoff-PL 2.50e-07 1.92e-07 1.51e-08 2.97e-11 4.57e-07 4.57e-07 erg/cm2
Error 6.51e-08 9.74e-08 5.27e-08 1.94e-08 1.40e-07 1.41e-07 erg/cm2
Peak flux Cutoff-PL 1.44e-02 6.51e-03 2.50e-04 1.82e-07 2.12e-02 2.12e-02 ph/cm2/s
Error 3.50e-03 4.62e-03 8.42e-04 4.63e-03 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+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 2.897 0.595 - - 8.28e-05 6.26e-05 63.080 57
CPL -2.792 0.000 20.9 0.0 1.79e+00 0.00e+00 59.980 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 2.875 0.567 - - 8.51e-05 4.21e-05 64.390 57
CPL -2.646 0.000 20.8 0.0 1.45e+00 0.00e+00 60.820 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 576.000 0.000 576.000
T90 576.000 0.000 576.000
T50 576.000 0.000 576.000
Peak 576.000 0.000 576.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.0731 -61.9124 0.0460 7.7 -78.9 1.4936 4.2 TRIG_00439550
------------------------------------------
Foreground time interval of the image:
0.000 60.750 (delta_t = 60.750 [sec])
61.000 576.000 (delta_t = 515.000 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 60.750000
61.000000 576.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.89675 ( -0.484559 0.706082 )
Norm@50keV : 8.27947E-05 ( -8.20454e-05 4.30933e-05 )
------------------------------------------------------------
# Chi-Squared = 63.08 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.702704e-01
Photon flux (15-150 keV) in 575.8 sec: 2.10161E-02 ( -0.00504839 0.00510636 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36927e-07 ( -1.6445e-07 1.89068e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 60.750000
61.000000 576.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.79192 ( )
Epeak [keV] : 20.9492 ( )
Norm@50keV : 1.79464 ( )
------------------------------------------------------------
# Chi-Squared = 59.98 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.334425e-01
Photon flux (15-150 keV) in 575.8 sec: 2.10096E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56791e-07 ( -1.28327e-07 1.52383e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 60.750000
61.000000 576.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.799428 ( -1.60012 0.243557 )
beta : -9.99990 ( 30850 30860 )
Epeak [keV] : 19.7146 ( -16.4739 5.79914 )
Norm@50keV : 4.81739E-02 ( -0.0588584 36.0699 )
------------------------------------------------------------
# Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.064819e-01
Photon flux (15-150 keV) in 575.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 61.000 sec. to 576.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.87543 ( -0.455138 0.679815 )
Norm@50keV : 8.50541E-05 ( -4.1699e-05 4.24089e-05 )
------------------------------------------------------------
# Chi-Squared = 64.39 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.339638e-01
Photon flux (15-150 keV) in 575.8 sec: 2.12322E-02 ( -0.00486246 0.00493476 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.45154e-07 ( -1.62818e-07 1.8807e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 61.000 sec. to 576.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.64611 ( )
Epeak [keV] : 20.7571 ( )
Norm@50keV : 1.44916 ( )
------------------------------------------------------------
# Chi-Squared = 60.82 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 56 degrees of freedom
# Null hypothesis probability = 3.064757e-01
Photon flux (15-150 keV) in 575.8 sec: 2.11736E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59927e-07 ( -6.35919e-08 1.49874e-07 ) ergs/cm2
Band function
Time interval is from 61.000 sec. to 576.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.31331 ( 0.822496 3.57137 )
beta : -2.92525 ( -0.632514 0.498059 )
Epeak [keV] : 26.5762 ( -26.5762 -26.5762 )
Norm@50keV : 1.10738E-02 ( -0.0052796 0.00613371 )
------------------------------------------------------------
# Chi-Squared = 64.36 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 55 degrees of freedom
# Null hypothesis probability = 1.815668e-01
Photon flux (15-150 keV) in 575.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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:
Wed Dec 1 08:09:04 EST 2010