batgrbproduct Analysis for Trigger=446475
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): Tue Feb 22 18:04:06 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger446475/GCN5_download_cron
======================================================================
Trigger: 00446475 Segment: 000
BAT Trigger Time: 320052104 [s; MET]
Trigger Stop: 320052168 [s; MET]
UTC: 2011-02-22T07:21:37.311780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.776389529393 Dec: -30.3210030804395 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.44
Flight Position: [ source = BAT ]
RA: 264.776389529393 Dec: -30.3210030804395 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.782702574585 Dec: -30.3119211255243 [deg; J2000]
{ 17h 39m 07.8s , -30d 18' 42.9" }
+/- 2.64735055737418 [arcmin] (estimated 90% radius based on SNR)
+/- 1.22749506896033 [arcmin] (formal 1-sigma fit error)
SNR: 7.57010699310773
Angular difference between Flight and Ground position is 0.635495 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 416 +/- 57.6888204074238
Measured from: -54.9999998807907
to: 361.000000119209 [s; relative to TRIGTIME]
T50: 208 +/- 35.7770876399966
Measured from: 25.0000001192093
to: 233.000000119209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 32.5
to: 33.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -71
to: 393 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.823383 2.455981 0.642350 0.276531
0.149517 0.147131 0.142407 0.165949 [error]
Peak 0.017158 0.017745 -0.009785 0.015261
0.007713 0.007785 0.007688 0.008671 [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 1.03e-06 9.72e-07 6.34e-07 6.40e-07 2.90e-06 3.28e-06 erg/cm2
Error 1.00e-07 8.17e-08 1.13e-07 2.14e-07 2.59e-07 3.74e-07 erg/cm2
Peak flux Power-law 1.42e-01 7.97e-02 2.81e-02 1.30e-02 2.57e-01 2.63e-01 ph/cm2/s
Error 1.10e-01 6.30e-02 3.62e-02 3.42e-02 1.88e-01 1.96e-01 ph/cm2/s
Fluence Cutoff-PL 9.84e-07 1.07e-06 3.61e-07 2.56e-08 2.44e-06 2.44e-06 erg/cm2
Error 1.10e-07 1.06e-07 1.85e-07 2.96e-07 3.17e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.36e-01 1.49e-01 6.06e-03 4.77e-07 2.92e-01 2.92e-01 ph/cm2/s
Error 1.36e-01 1.26e-01 2.81e-02 1.69e-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 1.50e-01 3.00e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.77e-01 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 2.616 0.176 - - 6.08e-04 7.82e-05 54.780 57
CPL 0.799 0.000 20.8 0.0 1.00e-02 0.00e+00 48.290 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 2.491 1.375 - - 1.32e-03 1.40e-03 79.790 57
CPL -5.855 0.000 29.1 11.5 6.87e+02 0.00e+00 76.050 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 464.000 -71.000 393.000
T90 416.000 -55.000 361.000
T50 208.000 25.000 233.000
Peak 1.000 32.500 33.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.7827 -30.3119 0.0255 31.3 -155.6 2.0654 7.6 TRIG_00446475
------------------------------------------
Foreground time interval of the image:
-71.000 -55.824 (delta_t = 15.176 [sec])
-55.000 77.501 (delta_t = 132.501 [sec])
Background time interval of the image:
-119.000 -71.000 (delta_t = 48.000 [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
Multiple GTIs in the spectrum
tstart tstop
-71.000000 -55.823800
-55.000000 166.640000
168.000000 393.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.61632 ( -0.171428 0.180329 )
Norm@50keV : 6.07595E-04 ( -7.78704e-05 7.84409e-05 )
------------------------------------------------------------
# Chi-Squared = 54.78 using 59 PHA bins.
# Reduced chi-squared = 0.9611 for 57 degrees of freedom
# Null hypothesis probability = 5.586846e-01
Photon flux (15-150 keV) in 461.8 sec: 0.128395 ( -0.009488 0.00949182 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.90287e-06 ( -2.54959e-07 2.62162e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-71.000000 -55.823800
-55.000000 166.640000
168.000000 393.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.798667 ( )
Epeak [keV] : 20.7646 ( )
Norm@50keV : 1.00132E-02 ( )
------------------------------------------------------------
# Chi-Squared = 48.29 using 59 PHA bins.
# Reduced chi-squared = 0.8623 for 56 degrees of freedom
# Null hypothesis probability = 7.584029e-01
Photon flux (15-150 keV) in 461.8 sec: 0.128340 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44171e-06 ( -2.58262e-07 3.34306e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-71.000000 -55.823800
-55.000000 166.640000
168.000000 393.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.148770 ( -1.94161 3.64915 )
beta : -3.28209 ( -1.20303 0.475873 )
Epeak [keV] : 22.2590 ( -9.18926 3.27434 )
Norm@50keV : 5.28637E-02 ( -0.0523947 59.3909 )
------------------------------------------------------------
# Chi-Squared = 45.14 using 59 PHA bins.
# Reduced chi-squared = 0.8207 for 55 degrees of freedom
# Null hypothesis probability = 8.259694e-01
Photon flux (15-150 keV) in 461.8 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 32.500 sec. to 33.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.49091 ( -1.05031 1.69913 )
Norm@50keV : 1.31701E-03 ( -0.00130946 0.00148325 )
------------------------------------------------------------
# Chi-Squared = 79.79 using 59 PHA bins.
# Reduced chi-squared = 1.400 for 57 degrees of freedom
# Null hypothesis probability = 2.483761e-02
Photon flux (15-150 keV) in 1 sec: 0.256843 ( -0.187449 0.189494 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30612e-08 ( -1.30612e-08 1.26734e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.500 sec. to 33.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.85453 ( )
Epeak [keV] : 29.0543 ( -9.71129 13.3884 )
Norm@50keV : 687.075 ( )
------------------------------------------------------------
# Chi-Squared = 76.05 using 59 PHA bins.
# Reduced chi-squared = 1.358 for 56 degrees of freedom
# Null hypothesis probability = 3.858318e-02
Photon flux (15-150 keV) in 1 sec: 0.292037 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.02119e-09 ( -1.67834e-09 1.83859e-09 ) ergs/cm2
Band function
Time interval is from 32.500 sec. to 33.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.80515 ( -21.7511 -11.7679 )
beta : -9.37167 ( 10 19.9972 )
Epeak [keV] : 29.2379 ( -7.9368 13.0562 )
Norm@50keV : 125.701 ( -125.701 96.0758 )
------------------------------------------------------------
# Chi-Squared = 76.07 using 59 PHA bins.
# Reduced chi-squared = 1.383 for 55 degrees of freedom
# Null hypothesis probability = 3.146632e-02
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:
Tue Feb 22 18:27:27 EST 2011