batgrbproduct Analysis for Trigger=455155
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): Sat Jun 11 08:52:04 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger455155/GCN5_download_cron
======================================================================
Trigger: 00455155 Segment: 000
BAT Trigger Time: 329412099.072 [s; MET]
Trigger Stop: 329412100.096 [s; MET]
UTC: 2011-06-10T15:21:32.029260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 308.150900074669 Dec: 74.8229314124885 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.04
Image Trigger?: NO
Rate S/N Ratio: 28.0178514522438 [ if not an image trigger ]
Image S/N Ratio: 14.04
Flight Position: [ source = BAT ]
RA: 308.150900074669 Dec: 74.8229314124885 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 308.2176335897 Dec: 74.8237761372777 [deg; J2000]
{ 20h 32m 52.2s , +74d 49' 25.6" }
+/- 0.842935392375608 [arcmin] (estimated 90% radius based on SNR)
+/- 0.284711096065261 [arcmin] (formal 1-sigma fit error)
SNR: 38.8263476252008
Angular difference between Flight and Ground position is 1.049458 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 46.2919999957085 +/- 5.75076100492169
Measured from: -5.14399993419647
to: 41.148000061512 [s; relative to TRIGTIME]
T50: 29.9639999270439 +/- 1.04821370306114
Measured from: 5.57600009441376
to: 35.5400000214577 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 34.4239999651909
to: 35.4239999651909 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.0879999995232
to: 57.9759999513626 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.016510 2.883731 2.115665 0.605712
0.053246 0.056596 0.050755 0.041418 [error]
Peak 0.120384 0.178326 0.161167 0.052313
0.007495 0.008776 0.008168 0.006055 [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 6.73e-07 1.23e-06 1.72e-06 5.03e-06 4.92e-06 8.65e-06 erg/cm2
Error 3.44e-08 3.60e-08 5.40e-08 3.64e-07 1.32e-07 3.92e-07 erg/cm2
Peak flux Power-law 1.17e+00 1.34e+00 1.10e+00 1.51e+00 4.16e+00 5.12e+00 ph/cm2/s
Error 1.15e-01 7.97e-02 6.76e-02 1.97e-01 2.22e-01 2.76e-01 ph/cm2/s
Fluence Cutoff-PL 6.50e-07 1.24e-06 1.74e-06 4.09e-06 4.87e-06 7.72e-06 erg/cm2
Error 4.40e-08 3.91e-08 6.00e-08 1.03e-06 1.47e-07 1.03e-06 erg/cm2
Peak flux Cutoff-PL 1.15e+00 1.35e+00 1.11e+00 1.38e+00 4.14e+00 4.99e+00 ph/cm2/s
Error 1.36e-01 8.69e-02 7.77e-02 3.74e-01 2.28e-01 4.43e-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 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 1.514 0.048 - - 7.53e-03 1.91e-04 89.200 57
CPL 1.364 0.183 230.3 -65.0 8.84e-03 1.70e-03 87.390 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 1.285 0.091 - - 3.49e-02 1.81e-03 45.190 57
CPL 1.205 0.239 523.4 0.0 3.81e-02 1.28e-02 45.050 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: 48.768000 sec.
T50 in the 50-300 keV band: 30.720000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 69.064 -11.088 57.976
T90 46.292 -5.144 41.148
T50 29.964 5.576 35.540
Peak 1.000 34.424 35.424
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
308.2176 +74.8238 0.0050 27.0 -48.9 2.4812 38.8 TRIG_00455155
------------------------------------------
Foreground time interval of the image:
-11.088 11.229 (delta_t = 22.317 [sec])
Background time interval of the image:
-239.072 -11.088 (delta_t = 227.984 [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 -11.088 sec. to 57.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51406 ( -0.0484067 0.0484192 )
Norm@50keV : 7.53386E-03 ( -0.000191099 0.000191087 )
------------------------------------------------------------
# Chi-Squared = 89.20 using 59 PHA bins.
# Reduced chi-squared = 1.565 for 57 degrees of freedom
# Null hypothesis probability = 4.105815e-03
Photon flux (15-150 keV) in 69.06 sec: 0.944121 ( -0.0265776 0.0266595 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92457e-06 ( -1.31685e-07 1.31856e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.088 sec. to 57.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36438 ( -0.197352 0.168186 )
Epeak [keV] : 230.342 ( -100.389 -230.347 )
Norm@50keV : 8.83915E-03 ( -0.00139299 0.00201428 )
------------------------------------------------------------
# Chi-Squared = 87.39 using 59 PHA bins.
# Reduced chi-squared = 1.561 for 56 degrees of freedom
# Null hypothesis probability = 4.609688e-03
Photon flux (15-150 keV) in 69.06 sec: 0.933590 ( -0.02941 0.029525 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.87477e-06 ( -1.47726e-07 1.47001e-07 ) ergs/cm2
Band function
Time interval is from -11.088 sec. to 57.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.949881 ( -0.396964 5.91491 )
beta : -1.61347 ( -0.118933 0.106351 )
Epeak [keV] : 78.3756 ( -49.1278 91.1782 )
Norm@50keV : 1.52730E-02 ( -0.00650591 0.122664 )
------------------------------------------------------------
# Chi-Squared = 83.66 using 59 PHA bins.
# Reduced chi-squared = 1.521 for 55 degrees of freedom
# Null hypothesis probability = 7.636942e-03
Photon flux (15-150 keV) in 69.06 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 34.424 sec. to 35.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28462 ( -0.0910612 0.0909796 )
Norm@50keV : 3.49477E-02 ( -0.00180756 0.00180699 )
------------------------------------------------------------
# Chi-Squared = 45.19 using 59 PHA bins.
# Reduced chi-squared = 0.7929 for 57 degrees of freedom
# Null hypothesis probability = 8.705916e-01
Photon flux (15-150 keV) in 1 sec: 4.15777 ( -0.221478 0.221688 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4666e-07 ( -1.99446e-08 2.00422e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 34.424 sec. to 35.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20511 ( -0.355175 0.123292 )
Epeak [keV] : 523.444 ( -555.593 -555.593 )
Norm@50keV : 3.81255E-02 ( -0.00816945 0.0174681 )
------------------------------------------------------------
# Chi-Squared = 45.05 using 59 PHA bins.
# Reduced chi-squared = 0.8045 for 56 degrees of freedom
# Null hypothesis probability = 8.523167e-01
Photon flux (15-150 keV) in 1 sec: 4.14420 ( -0.22846 0.22794 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45383e-07 ( -2.1069e-08 2.036e-08 ) ergs/cm2
Band function
Time interval is from 34.424 sec. to 35.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.867637 ( 0.87539 0.87539 )
beta : -1.32922 ( 1.32926 0.127846 )
Epeak [keV] : 97.8821 ( -101.721 -101.721 )
Norm@50keV : 6.25323E-02 ( -0.0270801 106.53 )
------------------------------------------------------------
# Chi-Squared = 44.75 using 59 PHA bins.
# Reduced chi-squared = 0.8136 for 55 degrees of freedom
# Null hypothesis probability = 8.367094e-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:
Sat Jun 11 09:13:00 EDT 2011