batgrbproduct Analysis for Trigger=412982
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 10 13:31:48 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger412982/SDC
======================================================================
Trigger: 00412982 Segment: 000
BAT Trigger Time: 288285352 [s; MET]
Trigger Stop: 288285416 [s; MET]
UTC: 2010-02-19T15:15:46.455360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 154.220640694763 Dec: -12.559076333116 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.44
Flight Position: [ source = BAT ]
RA: 154.220640694763 Dec: -12.559076333116 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 154.195075053118 Dec: -12.5707911558948 [deg; J2000]
{ 10h 16m 46.8s , -12d 34' 14.8" }
+/- 2.1590552232775 [arcmin] (estimated 90% radius based on SNR)
+/- 1.0776577745162 [arcmin] (formal 1-sigma fit error)
SNR: 10.1297502098704
Angular difference between Flight and Ground position is 1.653984 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 22.1719999313354 +/- 6.64771150189809
Measured from: 20.1240000128746
to: 42.2959999442101 [s; relative to TRIGTIME]
T50: 11.7119999527931 +/- 4.22362307038684
Measured from: 22.7799999713898
to: 34.4919999241829 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 31.8920000195503
to: 32.8920000195503 [s; relative to TRIGTIME]
Total Fluence
Measured from: 13.3040000200272
to: 43.2760000228882 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.128514 0.241406 0.191405 0.049529
0.030509 0.030513 0.027179 0.023686 [error]
Peak 0.013997 0.019870 0.012879 0.006153
0.005537 0.005570 0.004939 0.004187 [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 4.30e-08 9.23e-08 1.56e-07 6.03e-07 4.28e-07 8.94e-07 erg/cm2
Error 1.15e-08 1.48e-08 2.63e-08 2.31e-07 6.64e-08 2.47e-07 erg/cm2
Peak flux Power-law 1.28e-01 1.33e-01 9.73e-02 1.14e-01 4.03e-01 4.73e-01 ph/cm2/s
Error 7.21e-02 4.66e-02 4.08e-02 1.05e-01 1.32e-01 1.58e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 1.28e-01 1.33e-01 9.74e-02 1.14e-01 4.04e-01 4.70e-01 ph/cm2/s
Error 7.21e-02 3.90e-02 4.12e-02 1.06e-01 1.32e-01 1.58e-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 1.244 0.250 - - 1.43e-03 2.00e-04 57.180 57
CPL 2.027 0.000 10.2 0.0 4.45e-04 0.00e+00 56.750 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 1.451 0.610 - - 3.27e-03 1.10e-03 84.340 57
CPL 1.456 0.613 9999.3 0.0 3.26e-03 4.84e-02 84.340 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: 18.240000 sec.
T50 in the 50-300 keV band: 6.144000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 29.972 13.304 43.276
T90 22.172 20.124 42.296
T50 11.712 22.780 34.492
Peak 1.000 31.892 32.892
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
154.1951 -12.5708 0.0190 25.4 32.3 0.5836 10.1 TRIG_00412982
------------------------------------------
Foreground time interval of the image:
13.304 43.276 (delta_t = 29.972 [sec])
Background time interval of the image:
-239.000 13.304 (delta_t = 252.304 [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 13.304 sec. to 43.276 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24432 ( -0.252019 0.247228 )
Norm@50keV : 1.42587E-03 ( -0.000199618 0.000199612 )
------------------------------------------------------------
# Chi-Squared = 57.18 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.685590e-01
Photon flux (15-150 keV) in 29.97 sec: 0.168486 ( -0.0244045 0.0245109 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2831e-07 ( -6.60982e-08 6.68004e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.304 sec. to 43.276 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02718 ( )
Epeak [keV] : 10.1843 ( )
Norm@50keV : 4.44555E-04 ( )
------------------------------------------------------------
# Chi-Squared = 56.75 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 56 degrees of freedom
# Null hypothesis probability = 4.469256e-01
Photon flux (15-150 keV) in 29.97 sec: 0.167065 ( -0.025244 0.025189 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 13.304 sec. to 43.276 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37339E-02 ( 0.706443 5.67062 )
beta : -1.36963 ( 1.30035 0.290435 )
Epeak [keV] : 57.3303 ( -56.8136 501.024 )
Norm@50keV : 8.06576E-03 ( -0.00829953 223.85 )
------------------------------------------------------------
# Chi-Squared = 56.62 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.141571e-01
Photon flux (15-150 keV) in 29.97 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 31.892 sec. to 32.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45119 ( -0.61418 0.606345 )
Norm@50keV : 3.26798E-03 ( -0.0011117 0.00108094 )
------------------------------------------------------------
# Chi-Squared = 84.34 using 59 PHA bins.
# Reduced chi-squared = 1.480 for 57 degrees of freedom
# Null hypothesis probability = 1.077819e-02
Photon flux (15-150 keV) in 1 sec: 0.402851 ( -0.132105 0.132521 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12652e-08 ( -1.13957e-08 1.18327e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 31.892 sec. to 32.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45649 ( -0.624793 0.602205 )
Epeak [keV] : 9999.34 ( -9979.6 -9979.6 )
Norm@50keV : 3.26424E-03 ( -0.00327507 0.0935178 )
------------------------------------------------------------
# Chi-Squared = 84.34 using 59 PHA bins.
# Reduced chi-squared = 1.506 for 56 degrees of freedom
# Null hypothesis probability = 8.505072e-03
Photon flux (15-150 keV) in 1 sec: 0.403639 ( -0.132801 0.131411 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.12952e-08 ( -1.27868e-08 1.17533e-08 ) ergs/cm2
Band function
Time interval is from 31.892 sec. to 32.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99943 ( -3348.64 -3348.64 )
beta : -1.73065 ( -1.52095 0.808242 )
Epeak [keV] : 28.9085 ( -28.9085 13.9639 )
Norm@50keV : 148.523 ( -148.524 2.76875e+06 )
------------------------------------------------------------
# Chi-Squared = 83.71 using 59 PHA bins.
# Reduced chi-squared = 1.522 for 55 degrees of freedom
# Null hypothesis probability = 7.557472e-03
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 14:15:14 EDT 2011