batgrbproduct Analysis for Trigger=437466
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): Sun Oct 31 09:19:49 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger437466/GCN5_download_cron
======================================================================
Trigger: 00437466 Segment: 000
BAT Trigger Time: 310211528 [s; MET]
Trigger Stop: 310212656 [s; MET]
UTC: 2010-10-31T09:52:01.676240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.005249515318 Dec: -24.7751627070805 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.01
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.01
Flight Position: [ source = BAT ]
RA: 267.005249515318 Dec: -24.7751627070805 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.977390242438 Dec: -24.8175092280726 [deg; J2000]
{ 17h 47m 54.6s , -24d 49' 03.0" }
+/- 3.34279816147041 [arcmin] (estimated 90% radius based on SNR)
+/- 2.42174609642258 [arcmin] (formal 1-sigma fit error)
SNR: 5.42487315169374
Angular difference between Flight and Ground position is 2.959436 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 1128 +/-
Measured from: 0
to: 1128 [s; relative to TRIGTIME]
T50: 1128 +/-
Measured from: 0
to: 1128 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1128 second)
Measured from: 0
to: 1128 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1128 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.694326 0.391677 0.085437 -0.063401
0.162031 0.145710 0.123714 0.110895 [error]
Peak 1.694326 0.391677 0.085437 -0.063401
0.162031 0.145710 0.123714 0.110895 [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 4.54e-07 1.51e-07 2.83e-08 6.21e-09 6.37e-07 6.40e-07 erg/cm2
Error 8.30e-08 7.28e-08 3.16e-08 1.44e-08 1.51e-07 1.55e-07 erg/cm2
Peak flux Power-law 2.44e-02 4.41e-03 3.82e-04 3.58e-05 2.93e-02 2.93e-02 ph/cm2/s
Error 3.43e-03 1.96e-03 4.38e-04 6.71e-05 5.04e-03 5.05e-03 ph/cm2/s
Fluence Cutoff-PL 4.54e-07 1.51e-07 2.83e-08 6.16e-09 6.37e-07 6.39e-07 erg/cm2
Error 8.30e-08 7.29e-08 3.15e-08 1.43e-08 1.51e-07 1.55e-07 erg/cm2
Peak flux Cutoff-PL 2.44e-02 4.40e-03 3.81e-04 3.55e-05 2.92e-02 2.92e-02 ph/cm2/s
Error 3.43e-03 1.96e-03 4.37e-04 5.05e-03 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 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 4.429 0.868 - - 3.21e-05 3.35e-05 67.210 57
CPL 1.000 0.000 50.0 0.0 4.19e-04 0.00e+00 113.590 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 4.528 0.743 - - 2.95e-05 2.92e-05 68.230 57
CPL 1.000 0.000 50.0 0.0 5.22e-04 0.00e+00 154.320 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1128.000 0.000 1128.000
T90 1128.000 0.000 1128.000
T50 1128.000 0.000 1128.000
Peak 1128.000 0.000 1128.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.9774 -24.8175 0.0355 4.2 14.0 2.6533 5.4 TRIG_00437466
------------------------------------------
Foreground time interval of the image:
0.000 359.970 (delta_t = 359.970 [sec])
361.000 648.410 (delta_t = 287.410 [sec])
Background time interval of the image:
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
0.000000 359.970000
361.000000 648.410000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.42918 ( -0.779056 0.957113 )
Norm@50keV : 3.21110E-05 ( -3.2133e-05 3.48758e-05 )
------------------------------------------------------------
# Chi-Squared = 67.21 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.669082e-01
Photon flux (15-150 keV) in 647.4 sec: 2.90834E-02 ( -0.00549809 0.0055302 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.37427e-07 ( -1.43502e-07 1.58023e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 359.970000
361.000000 648.410000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.18535E-04 ( )
------------------------------------------------------------
# Chi-Squared = 113.59 using 59 PHA bins.
# Reduced chi-squared = 2.0284 for 56 degrees of freedom
# Null hypothesis probability = 8.551198e-06
Photon flux (15-150 keV) in 647.4 sec: 2.90619E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.37268e-07 ( -1.43527e-07 1.5803e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 359.970000
361.000000 648.410000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.13517 ( 5.24852 5.24852 )
beta : -4.41722 ( -0.967412 0.76746 )
Epeak [keV] : 43.4292 ( -43.4292 -43.4292 )
Norm@50keV : 4.41557E-03 ( -0.00441557 0.00469027 )
------------------------------------------------------------
# Chi-Squared = 67.21 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 55 degrees of freedom
# Null hypothesis probability = 1.249568e-01
Photon flux (15-150 keV) in 647.4 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 361.000 sec. to 648.410 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.52814 ( -0.655721 0.83127 )
Norm@50keV : 2.95226E-05 ( -2.95226e-05 2.89693e-05 )
------------------------------------------------------------
# Chi-Squared = 68.23 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.465497e-01
Photon flux (15-150 keV) in 647.4 sec: 2.92578E-02 ( -0.00503057 0.00504448 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33509e-07 ( -1.36899e-07 1.52526e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 361.000 sec. to 648.410 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 5.21753E-04 ( )
------------------------------------------------------------
# Chi-Squared = 154.32 using 59 PHA bins.
# Reduced chi-squared = 2.7557 for 56 degrees of freedom
# Null hypothesis probability = 3.935222e-11
Photon flux (15-150 keV) in 647.4 sec: 2.92355E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.33335e-07 ( -1.36937e-07 1.52538e-07 ) ergs/cm2
Band function
Time interval is from 361.000 sec. to 648.410 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.37281 ( 2.37281 2.37281 )
beta : -4.52814 ( -0.830699 0.65571 )
Epeak [keV] : 3.39663 ( -3.39663 -3.39663 )
Norm@50keV : 0.223466 ( -0.223466 2.17612 )
------------------------------------------------------------
# Chi-Squared = 68.23 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 55 degrees of freedom
# Null hypothesis probability = 1.084116e-01
Photon flux (15-150 keV) in 647.4 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
Plot creation:
Sun Oct 31 09:42:05 EDT 2010