batgrbproduct Analysis for Trigger=437408
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 Oct 30 21:10:22 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger437408/GCN5_download_cron
======================================================================
Trigger: 00437408 Segment: 000
BAT Trigger Time: 310146996.224 [s; MET]
Trigger Stop: 310146997.248 [s; MET]
UTC: 2010-10-30T15:56:29.902620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.389847725746 Dec: -16.3867038690091 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.77
Image Trigger?: NO
Rate S/N Ratio: 14.4913767461894 [ if not an image trigger ]
Image S/N Ratio: 7.77
Flight Position: [ source = BAT ]
RA: 166.389847725746 Dec: -16.3867038690091 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.389652046567 Dec: -16.3892229790771 [deg; J2000]
{ 11h 05m 33.5s , -16d 23' 21.2" }
+/- 1.05720998317195 [arcmin] (estimated 90% radius based on SNR)
+/- 0.504222697598916 [arcmin] (formal 1-sigma fit error)
SNR: 28.0932704890344
Angular difference between Flight and Ground position is 0.151566 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 101.667999923229 +/- 7.30447018128384
Measured from: -66.9799998402596
to: 34.6880000829697 [s; relative to TRIGTIME]
T50: 66.227999985218 +/- 1.88679620897342
Measured from: -56.3759998679161
to: 9.85200011730194 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.156000018119812
to: 1.15600001811981 [s; relative to TRIGTIME]
Total Fluence
Measured from: -73.5119999647141
to: 47.5400000214577 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.761661 1.958150 1.252787 0.267758
0.062743 0.064824 0.057376 0.050141 [error]
Peak 0.042990 0.049002 0.039707 -0.003413
0.005784 0.006167 0.005569 0.004664 [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 4.89e-07 7.88e-07 9.61e-07 2.30e-06 2.89e-06 4.54e-06 erg/cm2
Error 3.64e-08 3.34e-08 5.81e-08 3.08e-07 1.32e-07 3.48e-07 erg/cm2
Peak flux Power-law 3.96e-01 3.58e-01 2.24e-01 2.13e-01 1.07e+00 1.19e+00 ph/cm2/s
Error 7.21e-02 4.52e-02 4.39e-02 8.00e-02 1.35e-01 1.60e-01 ph/cm2/s
Fluence Cutoff-PL 4.89e-07 7.89e-07 9.61e-07 2.28e-06 2.89e-06 4.52e-06 erg/cm2
Error 3.64e-08 3.34e-08 5.82e-08 3.06e-07 1.33e-07 3.46e-07 erg/cm2
Peak flux Cutoff-PL 3.71e-01 3.87e-01 2.29e-01 9.98e-02 1.05e+00 1.09e+00 ph/cm2/s
Error 8.06e-02 5.89e-02 4.86e-02 1.76e-01 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 3.69e-01 3.86e-01 1.08e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 7.33e-02 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 1.715 0.083 - - 2.58e-03 1.12e-04 45.060 57
CPL 1.700 0.283 997.0 0.0 2.62e-03 0.00e+00 45.110 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 1.679 0.222 - - 8.09e-03 1.21e-03 34.800 57
CPL 1.074 0.835 68.2 -22.6 1.76e-02 2.89e-02 33.060 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: 100.288000 sec.
T50 in the 50-300 keV band: 67.264000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 121.052 -73.512 47.540
T90 101.668 -66.980 34.688
T50 66.228 -56.376 9.852
Peak 1.000 0.156 1.156
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.3897 -16.3892 0.0068 12.9 -56.7 1.9106 28.1 TRIG_00437408
------------------------------------------
Foreground time interval of the image:
-32.023 10.877 (delta_t = 42.900 [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
Time interval is from -73.512 sec. to 47.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71452 ( -0.0822451 0.0830852 )
Norm@50keV : 2.58438E-03 ( -0.000112442 0.000111496 )
------------------------------------------------------------
# Chi-Squared = 45.06 using 59 PHA bins.
# Reduced chi-squared = 0.7905 for 57 degrees of freedom
# Null hypothesis probability = 8.736480e-01
Photon flux (15-150 keV) in 121.1 sec: 0.344995 ( -0.0147552 0.0148141 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89453e-06 ( -1.32083e-07 1.329e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -73.512 sec. to 47.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70035 ( -0.260719 0.304561 )
Epeak [keV] : 997.018 ( )
Norm@50keV : 2.62207E-03 ( )
------------------------------------------------------------
# Chi-Squared = 45.11 using 59 PHA bins.
# Reduced chi-squared = 0.8055 for 56 degrees of freedom
# Null hypothesis probability = 8.509655e-01
Photon flux (15-150 keV) in 121.1 sec: 0.344817 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.89446e-06 ( -1.32096e-07 1.32931e-07 ) ergs/cm2
Band function
Time interval is from -73.512 sec. to 47.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37744 ( 1.37748 1.37748 )
beta : -1.71445 ( -0.0834771 0.0821857 )
Epeak [keV] : 25.6785 ( -25.657 -25.657 )
Norm@50keV : 5.57307E-03 ( -0.00557384 0.653666 )
------------------------------------------------------------
# Chi-Squared = 45.06 using 59 PHA bins.
# Reduced chi-squared = 0.8193 for 55 degrees of freedom
# Null hypothesis probability = 8.281788e-01
Photon flux (15-150 keV) in 121.1 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
Peak spectrum fit
Power-law model
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67948 ( -0.215994 0.228239 )
Norm@50keV : 8.09229E-03 ( -0.0012291 0.00119574 )
------------------------------------------------------------
# Chi-Squared = 34.80 using 59 PHA bins.
# Reduced chi-squared = 0.6105 for 57 degrees of freedom
# Null hypothesis probability = 9.910894e-01
Photon flux (15-150 keV) in 1 sec: 1.06716 ( -0.13479 0.134799 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.50525e-08 ( -1.18914e-08 1.22061e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07412 ( -0.934744 0.73554 )
Epeak [keV] : 68.2128 ( -22.9565 -68.2077 )
Norm@50keV : 1.76277E-02 ( -0.01763 0.0400836 )
------------------------------------------------------------
# Chi-Squared = 33.06 using 59 PHA bins.
# Reduced chi-squared = 0.5903 for 56 degrees of freedom
# Null hypothesis probability = 9.937687e-01
Photon flux (15-150 keV) in 1 sec: 1.04975 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11092e-08 ( -1.25742e-08 1.31566e-08 ) ergs/cm2
Band function
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.84729 ( 1.35635 1.30112 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 1.72309 ( -1.72309 -1.72309 )
Norm@50keV : 4.64112E-19 ( -7.06858e-20 7.06858e-20 )
------------------------------------------------------------
# Chi-Squared = 88.02 using 59 PHA bins.
# Reduced chi-squared = 1.600 for 55 degrees of freedom
# Null hypothesis probability = 3.108956e-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:
Sat Oct 30 21:29:02 EDT 2010