batgrbproduct Analysis for Trigger=445141
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): Thu Feb 10 20:19:52 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger445141/GCN5_download_cron
======================================================================
Trigger: 00445141 Segment: 000
BAT Trigger Time: 319024368 [s; MET]
Trigger Stop: 319024432 [s; MET]
UTC: 2011-02-10T09:52:41.350180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 13.0773027882465 Dec: 7.79171040387002 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.13
Flight Position: [ source = BAT ]
RA: 13.0773027882465 Dec: 7.79171040387002 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 13.107951137879 Dec: 7.77763674531645 [deg; J2000]
{ 00h 52m 25.9s , +07d 46' 39.5" }
+/- 3.15193057294379 [arcmin] (estimated 90% radius based on SNR)
+/- 1.78670819615313 [arcmin] (formal 1-sigma fit error)
SNR: 5.90019048871368
Angular difference between Flight and Ground position is 2.008124 arcmin
Partial Coding Fraction: 0.8359375 [ including projection effects ]
Duration
T90: 233.600000023842 +/- 59.5227870127869
Measured from: -99.0959998965263
to: 134.504000127316 [s; relative to TRIGTIME]
T50: 98.8159999847412 +/- 59.9194680681681
Measured from: -57.4319998621941
to: 41.3840001225471 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -54.444000005722
to: -53.444000005722 [s; relative to TRIGTIME]
Total Fluence
Measured from: -102.871999979019
to: 153.575999975204 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.483485 0.646204 0.416047 0.061262
0.084107 0.088562 0.083509 0.086431 [error]
Peak 0.018611 0.011554 0.010087 0.005383
0.005391 0.005897 0.005391 0.005708 [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 1.64e-07 2.63e-07 3.17e-07 7.49e-07 9.60e-07 1.49e-06 erg/cm2
Error 3.79e-08 4.08e-08 8.01e-08 3.87e-07 1.86e-07 4.67e-07 erg/cm2
Peak flux Power-law 1.55e-01 1.14e-01 5.55e-02 3.85e-02 3.42e-01 3.62e-01 ph/cm2/s
Error 8.29e-02 4.88e-02 4.28e-02 6.43e-02 1.38e-01 1.53e-01 ph/cm2/s
Fluence Cutoff-PL 1.58e-07 2.77e-07 3.15e-07 3.58e-07 9.15e-07 1.11e-06 erg/cm2
Error 4.19e-08 5.43e-08 8.88e-08 5.39e-07 2.14e-07 6.20e-07 erg/cm2
Peak flux Cutoff-PL 1.55e-01 1.14e-01 5.55e-02 3.82e-02 3.42e-01 3.62e-01 ph/cm2/s
Error 8.29e-02 4.88e-02 4.28e-02 1.53e-01 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 1.729 0.289 - - 4.05e-04 7.46e-05 50.020 57
CPL 1.146 1.136 63.3 0.0 8.64e-04 0.00e+00 49.680 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 2.034 0.947 - - 2.24e-03 1.34e-03 68.660 57
CPL 2.058 0.000 57.9 0.0 2.12e-03 0.00e+00 68.660 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 256.448 -102.872 153.576
T90 233.600 -99.096 134.504
T50 98.816 -57.432 41.384
Peak 1.000 -54.444 -53.444
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
13.1080 +7.7776 0.0327 29.8 -7.8 1.2018 5.9 TRIG_00445141
------------------------------------------
Foreground time interval of the image:
-102.872 72.301 (delta_t = 175.173 [sec])
Background time interval of the image:
-239.000 -102.872 (delta_t = 136.128 [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 -102.872 sec. to 153.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72878 ( -0.280997 0.297654 )
Norm@50keV : 4.05279E-04 ( -7.57228e-05 7.33868e-05 )
------------------------------------------------------------
# Chi-Squared = 50.02 using 59 PHA bins.
# Reduced chi-squared = 0.8775 for 57 degrees of freedom
# Null hypothesis probability = 7.322950e-01
Photon flux (15-150 keV) in 256.4 sec: 5.43776E-02 ( -0.00843295 0.00843338 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.60097e-07 ( -1.83016e-07 1.89611e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -102.872 sec. to 153.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14593 ( -1.22508 1.04733 )
Epeak [keV] : 63.2528 ( )
Norm@50keV : 8.64021E-04 ( )
------------------------------------------------------------
# Chi-Squared = 49.68 using 59 PHA bins.
# Reduced chi-squared = 0.8871 for 56 degrees of freedom
# Null hypothesis probability = 7.115100e-01
Photon flux (15-150 keV) in 256.4 sec: 5.34323E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.14594e-07 ( -2.10874e-07 2.17414e-07 ) ergs/cm2
Band function
Time interval is from -102.872 sec. to 153.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.08619 ( -1.43336 -1.43336 )
beta : -1.88199 ( 1.88156 0.394468 )
Epeak [keV] : 28.9511 ( -28.1148 123.872 )
Norm@50keV : 4.52686E-02 ( -0.0395109 23.773 )
------------------------------------------------------------
# Chi-Squared = 49.30 using 59 PHA bins.
# Reduced chi-squared = 0.8963 for 55 degrees of freedom
# Null hypothesis probability = 6.913662e-01
Photon flux (15-150 keV) in 256.4 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 -54.444 sec. to -53.444 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03438 ( -0.789838 1.10329 )
Norm@50keV : 2.24338E-03 ( -0.00139938 0.00127097 )
------------------------------------------------------------
# Chi-Squared = 68.66 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.385284e-01
Photon flux (15-150 keV) in 1 sec: 0.341938 ( -0.137723 0.137902 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07311e-08 ( -1.06474e-08 1.21199e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -54.444 sec. to -53.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05850 ( )
Epeak [keV] : 57.8746 ( )
Norm@50keV : 2.12313E-03 ( )
------------------------------------------------------------
# Chi-Squared = 68.66 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 56 degrees of freedom
# Null hypothesis probability = 1.193835e-01
Photon flux (15-150 keV) in 1 sec: 0.341822 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07283e-08 ( -1.06461e-08 1.21204e-08 ) ergs/cm2
Band function
Time interval is from -54.444 sec. to -53.444 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.72122 ( 3.28998 4.78208 )
beta : -2.03438 ( -1.10329 0.789404 )
Epeak [keV] : 70.7895 ( -70.7895 -70.7895 )
Norm@50keV : 0.304907 ( -0.304907 0.172521 )
------------------------------------------------------------
# Chi-Squared = 68.66 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 55 degrees of freedom
# Null hypothesis probability = 1.019658e-01
Photon flux (15-150 keV) in 1 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:
Sat Feb 12 16:06:12 EST 2011