batgrbproduct Analysis for Trigger=412503
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): Fri May 27 14:16:06 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger412503/SDC
======================================================================
Trigger: 00412503 Segment: 000
BAT Trigger Time: 287993267.264 [s; MET]
Trigger Stop: 287993271.36 [s; MET]
UTC: 2010-02-16T06:07:41.729420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 283.261409555822 Dec: -8.7359185396393 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.28
Image Trigger?: NO
Rate S/N Ratio: 7.14142842854285 [ if not an image trigger ]
Image S/N Ratio: 7.28
Flight Position: [ source = BAT ]
RA: 283.261409555822 Dec: -8.7359185396393 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 283.401371742956 Dec: -8.80076864844284 [deg; J2000]
{ 18h 53m 36.3s , -08d 48' 02.8" }
+/- 3.70098436699807 [arcmin] (estimated 90% radius based on SNR)
+/- 2.80595993971861 [arcmin] (formal 1-sigma fit error)
SNR: 4.69068850172971
Angular difference between Flight and Ground position is 9.166408 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
T50: 4.09600001573563 +/-
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 4.09600001573563 second)
Measured from: 2.98023223876953e-08
to: 4.09600004553795 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 4.09600001573563 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.088977 -0.012748 0.000664 0.006729
0.011483 0.010428 0.009188 0.009040 [error]
Peak 0.088977 -0.012748 0.000664 0.006729
0.011483 0.010428 0.009188 0.009040 [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 2.06e-08 1.91e-09 7.09e-11 2.72e-12 2.26e-08 2.26e-08 erg/cm2
Error 5.95e-09 2.30e-09 2.24e-10 2.41e-11 7.62e-09 7.62e-09 erg/cm2
Peak flux Power-law 1.79e-01 9.83e-03 1.82e-04 3.43e-06 1.89e-01 1.89e-01 ph/cm2/s
Error 4.97e-02 1.14e-02 5.54e-04 2.86e-05 5.68e-02 5.68e-02 ph/cm2/s
Fluence Cutoff-PL 2.26e-08 6.76e-10 1.53e-14 7.04e-25 2.32e-08 2.31e-08 erg/cm2
Error 4.98e-09 1.93e-09 4.87e-11 0.00e+00 7.04e-09 7.15e-09 erg/cm2
Peak flux Cutoff-PL 1.97e-01 3.83e-03 4.96e-08 1.47e-18 1.99e-01 1.91e-01 ph/cm2/s
Error 4.28e-02 9.63e-03 8.14e-05 0.00e+00 4.40e-02 6.43e-02 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 6.755 1.672 - - 2.13e-05 5.07e-05 47.320 57
CPL 1.000 0.000 50.0 0.0 1.74e-03 0.00e+00 87.620 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 6.755 1.672 - - 2.13e-05 5.07e-05 47.320 57
CPL 1.000 0.000 50.0 0.0 1.74e-03 0.00e+00 87.620 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 4.096 0.000 4.096
T90 4.096 0.000 4.096
T50 4.096 0.000 4.096
Peak 4.096 0.000 4.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
283.4014 -8.8008 0.0410 5.1 -133.3 0.0957 4.7 TRIG_00412503
------------------------------------------
Foreground time interval of the image:
0.000 4.096 (delta_t = 4.096 [sec])
Background time interval of the image:
-184.363 -19.264 (delta_t = 165.099 [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 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.75524 ( -1.42149 1.92185 )
Norm@50keV : 2.13257E-05 ( -2.1337e-05 7.99743e-05 )
------------------------------------------------------------
# Chi-Squared = 47.32 using 59 PHA bins.
# Reduced chi-squared = 0.8302 for 57 degrees of freedom
# Null hypothesis probability = 8.160497e-01
Photon flux (15-150 keV) in 4.096 sec: 0.189287 ( -0.0568236 0.0568346 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25504e-08 ( -7.38214e-09 7.85285e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.73824E-03 ( )
------------------------------------------------------------
# Chi-Squared = 87.62 using 59 PHA bins.
# Reduced chi-squared = 1.565 for 56 degrees of freedom
# Null hypothesis probability = 4.399506e-03
Photon flux (15-150 keV) in 4.096 sec: 0.198975 ( -0.028909 0.059062 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32164e-08 ( -7.05184e-09 7.03332e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.87585 ( 3.75287 3.75287 )
beta : -6.75442 ( 0.822515 -2.45029 )
Epeak [keV] : 1.30940 ( -1.3094 -1.3094 )
Norm@50keV : 2.90126E-03 ( 842.236 -0.00290103 )
------------------------------------------------------------
# Chi-Squared = 47.32 using 59 PHA bins.
# Reduced chi-squared = 0.8603 for 55 degrees of freedom
# Null hypothesis probability = 7.596426e-01
Photon flux (15-150 keV) in 4.096 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 0.000 sec. to 4.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.75524 ( -1.42149 1.92185 )
Norm@50keV : 2.13257E-05 ( -2.1337e-05 7.99743e-05 )
------------------------------------------------------------
# Chi-Squared = 47.32 using 59 PHA bins.
# Reduced chi-squared = 0.8302 for 57 degrees of freedom
# Null hypothesis probability = 8.160497e-01
Photon flux (15-150 keV) in 4.096 sec: 0.189287 ( -0.0568236 0.0568346 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25504e-08 ( -7.38214e-09 7.85285e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.73824E-03 ( )
------------------------------------------------------------
# Chi-Squared = 87.62 using 59 PHA bins.
# Reduced chi-squared = 1.565 for 56 degrees of freedom
# Null hypothesis probability = 4.399506e-03
Photon flux (15-150 keV) in 4.096 sec: 0.198975 ( -0.028909 0.059062 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32164e-08 ( -7.05184e-09 7.03332e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 4.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.87585 ( 3.75287 3.75287 )
beta : -6.75442 ( 0.822515 -2.45029 )
Epeak [keV] : 1.30940 ( -1.3094 -1.3094 )
Norm@50keV : 2.90126E-03 ( 842.236 -0.00290103 )
------------------------------------------------------------
# Chi-Squared = 47.32 using 59 PHA bins.
# Reduced chi-squared = 0.8603 for 55 degrees of freedom
# Null hypothesis probability = 7.596426e-01
Photon flux (15-150 keV) in 4.096 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:
Fri May 27 14:50:15 EDT 2011