batgrbproduct Analysis for Trigger=451191
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 May 17 15:11:44 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger451191/SDC
======================================================================
Trigger: 00451191 Segment: 000
BAT Trigger Time: 324286408 [s; MET]
Trigger Stop: 324286488 [s; MET]
UTC: 2011-04-12T07:33:21.152460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 133.491854211323 Dec: 13.5166846952985 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.83
Flight Position: [ source = BAT ]
RA: 133.491854211323 Dec: 13.5166846952985 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 133.493029123167 Dec: 13.4895551662663 [deg; J2000]
{ 08h 53m 58.3s , +13d 29' 22.4" }
+/- 1.8905297382343 [arcmin] (estimated 90% radius based on SNR)
+/- 0.737664576977351 [arcmin] (formal 1-sigma fit error)
SNR: 12.2461359193485
Angular difference between Flight and Ground position is 1.629214 arcmin
Partial Coding Fraction: 0.1894531 [ including projection effects ]
Duration
T90: 21.4679999351501 +/- 3.76777492179169
Measured from: 14.5640000104904
to: 36.0319999456406 [s; relative to TRIGTIME]
T50: 7.44799995422363 +/- 1.50066253535313
Measured from: 18.1919999718666
to: 25.6399999260902 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 18.9879999756813
to: 19.9879999756813 [s; relative to TRIGTIME]
Total Fluence
Measured from: 13.6399999856949
to: 39.311999976635 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.788685 1.062274 0.724677 0.182242
0.071930 0.072751 0.067547 0.062759 [error]
Peak 0.069953 0.082280 0.101340 0.011454
0.014691 0.016159 0.014714 0.012806 [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 2.54e-07 4.40e-07 5.81e-07 1.57e-06 1.70e-06 2.84e-06 erg/cm2
Error 3.26e-08 3.58e-08 6.50e-08 3.63e-07 1.56e-07 4.20e-07 erg/cm2
Peak flux Power-law 6.06e-01 6.53e-01 5.00e-01 6.26e-01 2.00e+00 2.39e+00 ph/cm2/s
Error 1.92e-01 1.33e-01 1.14e-01 2.86e-01 3.81e-01 4.62e-01 ph/cm2/s
Fluence Cutoff-PL 2.31e-07 4.78e-07 5.91e-07 5.33e-07 1.59e-06 1.83e-06 erg/cm2
Error 3.77e-08 4.74e-08 7.28e-08 4.77e-07 1.77e-07 5.06e-07 erg/cm2
Peak flux Cutoff-PL 4.93e-01 7.12e-01 5.55e-01 1.93e+00 2.02e+00 0.00e+00 ph/cm2/s
Error 2.35e-01 1.60e-01 1.39e-01 3.92e-01 5.17e-01 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 2.19e+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 1.598 0.138 - - 7.08e-03 5.99e-04 50.120 57
CPL 0.860 0.630 71.9 51.7 1.75e-02 1.57e-02 45.240 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 1.385 0.305 - - 1.64e-02 3.13e-03 89.990 57
CPL 0.359 1.400 83.9 -28.3 5.20e-02 1.45e-01 87.900 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: 13.632000 sec.
T50 in the 50-300 keV band: 5.760000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 25.672 13.640 39.312
T90 21.468 14.564 36.032
T50 7.448 18.192 25.640
Peak 1.000 18.988 19.988
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
133.4930 +13.4896 0.0157 35.6 74.7 2.9278 12.2 TRIG_00451191
------------------------------------------
Foreground time interval of the image:
13.640 39.312 (delta_t = 25.672 [sec])
Background time interval of the image:
-1.699 13.640 (delta_t = 15.339 [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 13.640 sec. to 39.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59819 ( -0.137143 0.139053 )
Norm@50keV : 7.07623E-03 ( -0.000600948 0.000596573 )
------------------------------------------------------------
# Chi-Squared = 50.12 using 59 PHA bins.
# Reduced chi-squared = 0.8792 for 57 degrees of freedom
# Null hypothesis probability = 7.289273e-01
Photon flux (15-150 keV) in 25.67 sec: 0.908821 ( -0.073436 0.0734999 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69915e-06 ( -1.54868e-07 1.56491e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.640 sec. to 39.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.860254 ( -0.680036 0.580639 )
Epeak [keV] : 71.8747 ( -16.1291 87.1856 )
Norm@50keV : 1.75251E-02 ( -0.00878903 0.0225124 )
------------------------------------------------------------
# Chi-Squared = 45.24 using 59 PHA bins.
# Reduced chi-squared = 0.8078 for 56 degrees of freedom
# Null hypothesis probability = 8.477183e-01
Photon flux (15-150 keV) in 25.67 sec: 0.880558 ( -0.076795 0.07672 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58822e-06 ( -1.75955e-07 1.78671e-07 ) ergs/cm2
Band function
Time interval is from 13.640 sec. to 39.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.69740 ( -18.2404 -8.25851 )
beta : -1.78266 ( -0.190055 0.175969 )
Epeak [keV] : 27.3980 ( -4.94475 4.15856 )
Norm@50keV : 290.723 ( -157.4 30.0013 )
------------------------------------------------------------
# Chi-Squared = 43.66 using 59 PHA bins.
# Reduced chi-squared = 0.7938 for 55 degrees of freedom
# Null hypothesis probability = 8.646388e-01
Photon flux (15-150 keV) in 25.67 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 18.988 sec. to 19.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38483 ( -0.304057 0.305682 )
Norm@50keV : 1.64491E-02 ( -0.0031341 0.00312028 )
------------------------------------------------------------
# Chi-Squared = 89.99 using 59 PHA bins.
# Reduced chi-squared = 1.579 for 57 degrees of freedom
# Null hypothesis probability = 3.486820e-03
Photon flux (15-150 keV) in 1 sec: 1.99641 ( -0.38045 0.381189 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5944e-07 ( -3.31456e-08 3.36433e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.988 sec. to 19.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.358544 ( -1.68002 1.12055 )
Epeak [keV] : 83.9213 ( -27.2998 -83.9231 )
Norm@50keV : 5.19671E-02 ( -0.0519647 0.23733 )
------------------------------------------------------------
# Chi-Squared = 87.90 using 59 PHA bins.
# Reduced chi-squared = 1.570 for 56 degrees of freedom
# Null hypothesis probability = 4.146037e-03
Photon flux (15-150 keV) in 1 sec: 1.93138 ( -0.39361 0.39102 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 18.988 sec. to 19.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38482 ( 0.903362 2.45594 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 6.24030 ( -6.2403 -6.2403 )
Norm@50keV : 6.69875E-19 ( -6.69875e-19 -6.69875e-19 )
------------------------------------------------------------
# Chi-Squared = 101.00 using 59 PHA bins.
# Reduced chi-squared = 1.8363 for 55 degrees of freedom
# Null hypothesis probability = 1.558182e-04
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:
Thu May 26 13:35:54 EDT 2011