batgrbproduct Analysis for Trigger=451343
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 Apr 15 01:38:19 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger451343/GCN5_download_cron
======================================================================
Trigger: 00451343 Segment: 000
BAT Trigger Time: 324459741.376 [s; MET]
Trigger Stop: 324459757.76 [s; MET]
UTC: 2011-04-14T07:42:14.521920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 97.8758670233519 Dec: 24.3609952759365 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10
Image Trigger?: NO
Rate S/N Ratio: 13.3790881602597 [ if not an image trigger ]
Image S/N Ratio: 10
Flight Position: [ source = BAT ]
RA: 97.8758670233519 Dec: 24.3609952759365 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 97.875982056916 Dec: 24.3490359915559 [deg; J2000]
{ 06h 31m 30.2s , +24d 20' 56.5" }
+/- 1.61108954951304 [arcmin] (estimated 90% radius based on SNR)
+/- 0.686048121593822 [arcmin] (formal 1-sigma fit error)
SNR: 15.3898051769474
Angular difference between Flight and Ground position is 0.717585 arcmin
Partial Coding Fraction: 0.3007812 [ including projection effects ]
Duration
T90: 152 +/- 73.1710325197069
Measured from: -34.3759998679161
to: 117.624000132084 [s; relative to TRIGTIME]
T50: 30 +/- 5.8309518948453
Measured from: -7.37599986791611
to: 22.6240001320839 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.6240000128746
to: 9.6240000128746 [s; relative to TRIGTIME]
Total Fluence
Measured from: -38.3759999871254
to: 135.624000012875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.450763 1.999314 1.440940 0.339718
0.132936 0.139084 0.127578 0.123939 [error]
Peak 0.035263 0.041544 0.046159 0.009215
0.012079 0.012488 0.011438 0.010982 [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 5.82e-07 9.46e-07 1.16e-06 2.81e-06 3.49e-06 5.50e-06 erg/cm2
Error 7.80e-08 7.62e-08 1.28e-07 6.67e-07 3.02e-07 7.67e-07 erg/cm2
Peak flux Power-law 3.72e-01 3.78e-01 2.71e-01 3.09e-01 1.14e+00 1.33e+00 ph/cm2/s
Error 1.85e-01 1.20e-01 9.01e-02 2.10e-01 3.38e-01 3.74e-01 ph/cm2/s
Fluence Cutoff-PL 5.89e-07 9.44e-07 1.16e-06 2.79e-06 3.49e-06 5.28e-06 erg/cm2
Error 7.80e-08 5.78e-08 1.29e-07 1.08e-06 3.01e-07 1.15e-06 erg/cm2
Peak flux Cutoff-PL 3.19e-01 3.97e-01 2.93e-01 1.11e-01 1.28e+00 1.18e+00 ph/cm2/s
Error 2.21e-01 1.35e-01 5.48e-01 0.00e+00 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 1.19e+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 1.704 0.145 - - 2.17e-03 1.79e-04 63.990 57
CPL 1.708 0.146 9999.4 0.0 2.17e-03 0.00e+00 64.000 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 1.483 0.481 - - 9.19e-03 2.59e-03 59.490 57
CPL 0.800 2.031 96.0 0.0 1.93e-02 1.17e-01 59.060 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: 33.664000 sec.
T50 in the 50-300 keV band: 16.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 174.000 -38.376 135.624
T90 152.000 -34.376 117.624
T50 30.000 -7.376 22.624
Peak 1.000 8.624 9.624
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
97.8760 +24.3490 0.0124 49.3 -170.9 4.3609 15.4 TRIG_00451343
------------------------------------------
Foreground time interval of the image:
-38.376 -12.026 (delta_t = 26.350 [sec])
-11.376 65.425 (delta_t = 76.801 [sec])
Background time interval of the image:
-239.376 -38.376 (delta_t = 201.000 [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
-38.376000 -12.026000
-11.376000 135.624000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70363 ( -0.143671 0.146325 )
Norm@50keV : 2.17288E-03 ( -0.000179424 0.00017786 )
------------------------------------------------------------
# Chi-Squared = 63.99 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 57 degrees of freedom
# Null hypothesis probability = 2.445387e-01
Photon flux (15-150 keV) in 173.4 sec: 0.288950 ( -0.0234268 0.0235088 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48752e-06 ( -3.00525e-07 3.02521e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-38.376000 -12.026000
-11.376000 135.624000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70775 ( -0.148068 0.143854 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 2.17200E-03 ( )
------------------------------------------------------------
# Chi-Squared = 64.00 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 56 degrees of freedom
# Null hypothesis probability = 2.163288e-01
Photon flux (15-150 keV) in 173.4 sec: 0.288845 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48733e-06 ( -2.99184e-07 3.03155e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-38.376000 -12.026000
-11.376000 135.624000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26243 ( 1.26131 1.26131 )
beta : -1.71781 ( 1.71889 0.157233 )
Epeak [keV] : 43.6134 ( -44.2167 -44.2167 )
Norm@50keV : 4.55240E-03 ( -0.00256651 0 )
------------------------------------------------------------
# Chi-Squared = 63.93 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 55 degrees of freedom
# Null hypothesis probability = 1.915887e-01
Photon flux (15-150 keV) in 173.4 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 8.624 sec. to 9.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48339 ( -0.479534 0.483251 )
Norm@50keV : 9.18992E-03 ( -0.00259517 0.00258942 )
------------------------------------------------------------
# Chi-Squared = 59.49 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.851069e-01
Photon flux (15-150 keV) in 1 sec: 1.14222 ( -0.336451 0.339664 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.74221e-08 ( -2.60247e-08 2.63187e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.624 sec. to 9.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.800247 ( -2.53683 1.52515 )
Epeak [keV] : 95.9846 ( -95.9999 -95.9999 )
Norm@50keV : 1.92654E-02 ( -0.0192614 0.21454 )
------------------------------------------------------------
# Chi-Squared = 59.06 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 56 degrees of freedom
# Null hypothesis probability = 3.644675e-01
Photon flux (15-150 keV) in 1 sec: 1.27688 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.86726e-08 ( -2.66038e-08 2.76574e-08 ) ergs/cm2
Band function
Time interval is from 8.624 sec. to 9.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.881551 ( 0.881546 2.61868 )
beta : -9.37153 ( 9.99974 19.9997 )
Epeak [keV] : 102.867 ( -53.7984 -102.854 )
Norm@50keV : 1.75372E-02 ( -0.010342 0.0491631 )
------------------------------------------------------------
# Chi-Squared = 59.06 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 55 degrees of freedom
# Null hypothesis probability = 3.294041e-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:
Fri Apr 15 02:06:26 EDT 2011