batgrbproduct Analysis for Trigger=453628
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 May 19 18:13:52 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger453628/GCN5_download_cron
======================================================================
Trigger: 00453628 Segment: 000
BAT Trigger Time: 327463943.68 [s; MET]
Trigger Stop: 327463944.704 [s; MET]
UTC: 2011-05-19T02:12:16.711700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.628977846193 Dec: -23.4083422668494 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.44
Image Trigger?: NO
Rate S/N Ratio: 40.8778668719394 [ if not an image trigger ]
Image S/N Ratio: 21.44
Flight Position: [ source = BAT ]
RA: 261.628977846193 Dec: -23.4083422668494 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.637596688588 Dec: -23.4256103193408 [deg; J2000]
{ 17h 26m 33.0s , -23d 25' 32.2" }
+/- 0.694045226021283 [arcmin] (estimated 90% radius based on SNR)
+/- 0.181488022247831 [arcmin] (formal 1-sigma fit error)
SNR: 51.2515823198508
Angular difference between Flight and Ground position is 1.139585 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 27.2239999771118 +/- 3.01518819345611
Measured from: -2.71999990940094
to: 24.5040000677109 [s; relative to TRIGTIME]
T50: 10.1439999341965 +/- 0.591310400712041
Measured from: 0.716000139713287
to: 10.8600000739098 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.17199999094009
to: 3.17199999094009 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.66400003433228
to: 37.7599999904633 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.790289 3.028323 1.440151 0.275728
0.065398 0.063527 0.053124 0.043482 [error]
Peak 0.174653 0.231201 0.114084 0.025329
0.011722 0.011962 0.009934 0.006845 [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 9.55e-07 1.23e-06 1.16e-06 1.93e-06 3.99e-06 5.27e-06 erg/cm2
Error 5.16e-08 3.82e-08 5.48e-08 1.96e-07 1.26e-07 2.38e-07 erg/cm2
Peak flux Power-law 1.92e+00 1.54e+00 8.34e-01 6.59e-01 4.60e+00 4.96e+00 ph/cm2/s
Error 1.92e-01 1.01e-01 7.95e-02 1.21e-01 3.05e-01 3.23e-01 ph/cm2/s
Fluence Cutoff-PL 9.13e-07 1.26e-06 1.16e-06 1.26e-06 3.89e-06 4.59e-06 erg/cm2
Error 6.37e-08 4.51e-08 5.70e-08 1.57e-07 4.00e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.72e+00 1.68e+00 8.63e-01 2.75e-01 4.46e+00 4.54e+00 ph/cm2/s
Error 2.24e-01 1.31e-01 9.06e-02 1.47e-01 3.16e-01 3.49e-01 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 4.54e+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 2.087 0.063 - - 1.01e-02 3.42e-04 55.440 57
CPL 1.816 0.235 31.6 19.8 1.40e-02 3.59e-03 51.950 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 1.886 0.114 - - 3.22e-02 2.37e-03 64.010 57
CPL 1.074 0.516 52.2 11.6 8.87e-02 6.29e-02 55.180 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: 20.864000 sec.
T50 in the 50-300 keV band: 7.424000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 42.424 -4.664 37.760
T90 27.224 -2.720 24.504
T50 10.144 0.716 10.860
Peak 1.000 2.172 3.172
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.6376 -23.4256 0.0038 24.1 98.6 7.7541 51.3 TRIG_00453628
------------------------------------------
Foreground time interval of the image:
-4.664 37.760 (delta_t = 42.424 [sec])
Background time interval of the image:
-239.680 -4.664 (delta_t = 235.016 [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 -4.664 sec. to 37.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08665 ( -0.0624118 0.0630506 )
Norm@50keV : 1.01368E-02 ( -0.000342442 0.000340724 )
------------------------------------------------------------
# Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 0.9727 for 57 degrees of freedom
# Null hypothesis probability = 5.337235e-01
Photon flux (15-150 keV) in 42.42 sec: 1.58436 ( -0.0539426 0.0542076 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99018e-06 ( -1.25945e-07 1.2621e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.664 sec. to 37.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81644 ( -0.263964 0.205235 )
Epeak [keV] : 31.6279 ( -27.7039 11.825 )
Norm@50keV : 1.40171E-02 ( -0.00206226 0.00511626 )
------------------------------------------------------------
# Chi-Squared = 51.95 using 59 PHA bins.
# Reduced chi-squared = 0.9277 for 56 degrees of freedom
# Null hypothesis probability = 6.288524e-01
Photon flux (15-150 keV) in 42.42 sec: 1.54938 ( -0.06183 0.06214 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.88605e-06 ( -1.57276e-07 1.57221e-07 ) ergs/cm2
Band function
Time interval is from -4.664 sec. to 37.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.66446E-02 ( -1.85648 3.73543 )
beta : -2.18108 ( -0.152632 0.0889809 )
Epeak [keV] : 27.9688 ( -4.50593 10.2124 )
Norm@50keV : 0.291182 ( -0.289824 336.3 )
------------------------------------------------------------
# Chi-Squared = 47.11 using 59 PHA bins.
# Reduced chi-squared = 0.8565 for 55 degrees of freedom
# Null hypothesis probability = 7.665309e-01
Photon flux (15-150 keV) in 42.42 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 2.172 sec. to 3.172 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88627 ( -0.11222 0.115374 )
Norm@50keV : 3.22144E-02 ( -0.00238202 0.00235779 )
------------------------------------------------------------
# Chi-Squared = 64.01 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 57 degrees of freedom
# Null hypothesis probability = 2.439755e-01
Photon flux (15-150 keV) in 1 sec: 4.59640 ( -0.305212 0.305491 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96147e-07 ( -2.16628e-08 2.18078e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.172 sec. to 3.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07404 ( -0.547999 0.483915 )
Epeak [keV] : 52.1767 ( -8.03198 15.192 )
Norm@50keV : 8.86792E-02 ( -0.0395505 0.086197 )
------------------------------------------------------------
# Chi-Squared = 55.18 using 59 PHA bins.
# Reduced chi-squared = 0.9853 for 56 degrees of freedom
# Null hypothesis probability = 5.060536e-01
Photon flux (15-150 keV) in 1 sec: 4.45627 ( -0.31572 0.31584 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79853e-07 ( -2.3608e-08 2.3861e-08 ) ergs/cm2
Band function
Time interval is from 2.172 sec. to 3.172 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09601 ( -0.45489 0.511248 )
beta : -9.35365 ( 9.85682 19.8568 )
Epeak [keV] : 52.6508 ( -8.5228 14.7278 )
Norm@50keV : 8.59623E-02 ( -0.00555559 0.0409356 )
------------------------------------------------------------
# Chi-Squared = 55.18 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.676606e-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:
Thu May 19 18:47:10 EDT 2011