batgrbproduct Analysis for Trigger=449399
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 Mar 16 13:52:16 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger449399/GCN5_download_cron
======================================================================
Trigger: 00449399 Segment: 000
BAT Trigger Time: 321926231.296 [s; MET]
Trigger Stop: 321926235.392 [s; MET]
UTC: 2011-03-15T23:57:04.537480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 279.191126332668 Dec: 17.5321484999389 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.06
Image Trigger?: NO
Rate S/N Ratio: 9.74679434480896 [ if not an image trigger ]
Image S/N Ratio: 11.06
Flight Position: [ source = BAT ]
RA: 279.191126332668 Dec: 17.5321484999389 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 279.204959261802 Dec: 17.5372796426378 [deg; J2000]
{ 18h 36m 49.2s , +17d 32' 14.2" }
+/- 1.03706457989898 [arcmin] (estimated 90% radius based on SNR)
+/- 0.353870997063274 [arcmin] (formal 1-sigma fit error)
SNR: 28.8761084020111
Angular difference between Flight and Ground position is 0.849184 arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 76.9159999489784 +/- 11.8127735561507
Measured from: -49.8639999032021
to: 27.0520000457764 [s; relative to TRIGTIME]
T50: 32.4679999351501 +/- 2.15120062307272
Measured from: -20.5519998669624
to: 11.9160000681877 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.12800002098083
to: 4.12800002098083 [s; relative to TRIGTIME]
Total Fluence
Measured from: -66.7639999985695
to: 38.839999973774 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.075228 2.550104 1.651896 0.360618
0.094823 0.088110 0.075514 0.067875 [error]
Peak 0.059149 0.078619 0.041308 0.021078
0.009719 0.009618 0.008157 0.006943 [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 7.24e-07 1.13e-06 1.32e-06 3.00e-06 4.06e-06 6.18e-06 erg/cm2
Error 5.55e-08 5.02e-08 7.65e-08 3.82e-07 1.80e-07 4.34e-07 erg/cm2
Peak flux Power-law 6.24e-01 5.72e-01 3.62e-01 3.52e-01 1.70e+00 1.91e+00 ph/cm2/s
Error 1.47e-01 8.49e-02 6.69e-02 1.31e-01 2.48e-01 2.69e-01 ph/cm2/s
Fluence Cutoff-PL 7.07e-07 1.14e-06 1.33e-06 2.49e-06 4.02e-06 5.68e-06 erg/cm2
Error 6.83e-08 5.40e-08 7.75e-08 8.77e-07 2.01e-07 9.11e-07 erg/cm2
Peak flux Cutoff-PL 5.77e-01 6.02e-01 3.74e-01 1.98e-01 1.67e+00 1.75e+00 ph/cm2/s
Error 1.79e-01 1.10e-01 7.47e-02 3.56e-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 1.769 0.081 - - 4.22e-03 1.82e-04 49.160 57
CPL 1.607 0.265 122.2 0.0 5.08e-03 0.00e+00 48.720 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 1.658 0.245 - - 1.30e-02 1.91e-03 69.970 57
CPL 1.153 1.097 80.2 -6.5 2.40e-02 0.00e+00 69.370 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: 84.736000 sec.
T50 in the 50-300 keV band: 31.360000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 105.604 -66.764 38.840
T90 76.916 -49.864 27.052
T50 32.468 -20.552 11.916
Peak 1.000 3.128 4.128
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
279.2050 +17.5373 0.0066 40.5 -170.6 6.4506 28.9 TRIG_00449399
------------------------------------------
Foreground time interval of the image:
-66.764 -38.696 (delta_t = 28.068 [sec])
-37.296 35.105 (delta_t = 72.401 [sec])
Background time interval of the image:
-239.296 -66.764 (delta_t = 172.532 [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
-66.764000 -38.696000
-37.296000 38.840000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76927 ( -0.0802396 0.0808851 )
Norm@50keV : 4.22203E-03 ( -0.000182639 0.000181872 )
------------------------------------------------------------
# Chi-Squared = 49.16 using 59 PHA bins.
# Reduced chi-squared = 0.8624 for 57 degrees of freedom
# Null hypothesis probability = 7.604984e-01
Photon flux (15-150 keV) in 104.2 sec: 0.575000 ( -0.0262144 0.0263236 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.05531e-06 ( -1.7962e-07 1.80392e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-66.764000 -38.696000
-37.296000 38.840000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60682 ( -0.296496 0.232626 )
Epeak [keV] : 122.241 ( )
Norm@50keV : 5.07502E-03 ( )
------------------------------------------------------------
# Chi-Squared = 48.72 using 59 PHA bins.
# Reduced chi-squared = 0.8699 for 56 degrees of freedom
# Null hypothesis probability = 7.443527e-01
Photon flux (15-150 keV) in 104.2 sec: 0.569746 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01599e-06 ( -2.06837e-07 1.94614e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-66.764000 -38.696000
-37.296000 38.840000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.39877 ( 1.31272 5.77038 )
beta : -1.84853 ( 1.84454 0.140429 )
Epeak [keV] : 65.7420 ( -58.5626 -58.5626 )
Norm@50keV : 6.82856E-03 ( -0.00272543 191.556 )
------------------------------------------------------------
# Chi-Squared = 48.18 using 59 PHA bins.
# Reduced chi-squared = 0.8761 for 55 degrees of freedom
# Null hypothesis probability = 7.305784e-01
Photon flux (15-150 keV) in 104.2 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 3.128 sec. to 4.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65802 ( -0.241924 0.247382 )
Norm@50keV : 1.30160E-02 ( -0.00192329 0.00190255 )
------------------------------------------------------------
# Chi-Squared = 69.97 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.161078e-01
Photon flux (15-150 keV) in 1 sec: 1.70409 ( -0.247684 0.248424 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20958e-07 ( -1.86656e-08 1.88615e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.128 sec. to 4.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15257 ( -1.47328 0.720926 )
Epeak [keV] : 80.2494 ( -67.2815 -80.3512 )
Norm@50keV : 2.39921E-02 ( )
------------------------------------------------------------
# Chi-Squared = 69.37 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 56 degrees of freedom
# Null hypothesis probability = 1.080213e-01
Photon flux (15-150 keV) in 1 sec: 1.67016 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16476e-07 ( -2.17869e-08 2.1041e-08 ) ergs/cm2
Band function
Time interval is from 3.128 sec. to 4.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.556692 ( 0.530638 2.49813 )
beta : -2.07152 ( 2.0965 0.597299 )
Epeak [keV] : 56.7897 ( -56.3474 63.4267 )
Norm@50keV : 5.25463E-02 ( -0.0545123 1186.13 )
------------------------------------------------------------
# Chi-Squared = 68.42 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 55 degrees of freedom
# Null hypothesis probability = 1.055494e-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:
Wed Mar 16 14:28:34 EDT 2011