batgrbproduct Analysis for Trigger=436429
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 17 21:44:59 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger436429/GCN5_download_cron
======================================================================
Trigger: 00436429 Segment: 000
BAT Trigger Time: 309004373.696 [s; MET]
Trigger Stop: 309004374.72 [s; MET]
UTC: 2010-10-17T10:32:47.416220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 291.377889105661 Dec: -35.1409002465417 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.22
Image Trigger?: NO
Rate S/N Ratio: 95.7548954362125 [ if not an image trigger ]
Image S/N Ratio: 20.22
Flight Position: [ source = BAT ]
RA: 291.377889105661 Dec: -35.1409002465417 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 291.376960153825 Dec: -35.1406485439735 [deg; J2000]
{ 19h 25m 30.5s , -35d 08' 26.3" }
+/- 0.540763126663306 [arcmin] (estimated 90% radius based on SNR)
+/- 0.11934342787687 [arcmin] (formal 1-sigma fit error)
SNR: 73.2043435949513
Angular difference between Flight and Ground position is 0.048015 arcmin
Partial Coding Fraction: 0.4375 [ including projection effects ]
Duration
T90: 74.9359999895096 +/- 3.65699329168598
Measured from: -1.88399988412857
to: 73.052000105381 [s; relative to TRIGTIME]
T50: 20.4239999651909 +/- 0.506628082217073
Measured from: 4.63200014829636
to: 25.0560001134872 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.58000004291534
to: 3.58000004291534 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.4879999756813
to: 130.568000018597 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.329204 9.505327 7.969671 2.424649
0.086145 0.093907 0.087369 0.069877 [error]
Peak 0.208011 0.377741 0.423535 0.146015
0.012425 0.015245 0.016352 0.013230 [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 2.26e-06 4.28e-06 6.26e-06 1.95e-05 1.77e-05 3.23e-05 erg/cm2
Error 8.07e-08 8.87e-08 1.07e-07 7.98e-07 2.77e-07 8.22e-07 erg/cm2
Peak flux Power-law 2.23e+00 2.88e+00 2.71e+00 4.51e+00 9.34e+00 1.23e+01 ph/cm2/s
Error 1.65e-01 1.32e-01 1.29e-01 4.44e-01 3.79e-01 5.67e-01 ph/cm2/s
Fluence Cutoff-PL 2.22e-06 4.29e-06 6.30e-06 1.82e-05 1.77e-05 3.10e-05 erg/cm2
Error 1.11e-07 8.68e-08 9.33e-08 2.11e-06 2.75e-07 2.12e-06 erg/cm2
Peak flux Cutoff-PL 2.07e+00 2.96e+00 2.83e+00 3.12e+00 9.25e+00 1.10e+01 ph/cm2/s
Error 2.00e-01 1.49e-01 1.57e-01 8.83e-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 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 1.453 0.030 - - 1.36e-02 2.18e-04 37.850 57
CPL 1.393 0.097 614.9 0.0 1.44e-02 1.44e-03 37.130 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 1.086 0.067 - - 8.06e-02 3.26e-03 56.800 57
CPL 0.732 0.261 197.9 190.0 1.18e-01 3.30e-02 50.920 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: 72.064000 sec.
T50 in the 50-300 keV band: 18.304000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 136.056 -5.488 130.568
T90 74.936 -1.884 73.052
T50 20.424 4.632 25.056
Peak 1.000 2.580 3.580
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.3770 -35.1406 0.0026 36.6 -48.5 11.0710 73.2 TRIG_00436429
------------------------------------------
Foreground time interval of the image:
-5.488 10.205 (delta_t = 15.693 [sec])
Background time interval of the image:
-88.195 -5.488 (delta_t = 82.707 [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 -5.488 sec. to 130.568 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45257 ( -0.0300656 0.0299868 )
Norm@50keV : 1.36203E-02 ( -0.00021847 0.000218122 )
------------------------------------------------------------
# Chi-Squared = 37.85 using 59 PHA bins.
# Reduced chi-squared = 0.6640 for 57 degrees of freedom
# Null hypothesis probability = 9.762584e-01
Photon flux (15-150 keV) in 136.1 sec: 1.67958 ( -0.0323265 0.0324589 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77304e-05 ( -2.76574e-07 2.7658e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.488 sec. to 130.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39256 ( -0.122392 0.0715979 )
Epeak [keV] : 614.911 ( -615.191 -615.191 )
Norm@50keV : 1.44220E-02 ( -0.00113829 0.00173755 )
------------------------------------------------------------
# Chi-Squared = 37.13 using 59 PHA bins.
# Reduced chi-squared = 0.6630 for 56 degrees of freedom
# Null hypothesis probability = 9.756071e-01
Photon flux (15-150 keV) in 136.1 sec: 1.66994 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76873e-05 ( -2.7465e-07 2.74786e-07 ) ergs/cm2
Band function
Time interval is from -5.488 sec. to 130.568 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.981129 ( -0.444071 4.82773 )
beta : -1.48718 ( -0.0536333 0.0462378 )
Epeak [keV] : 85.3625 ( -39.08 117.739 )
Norm@50keV : 2.49476E-02 ( -0.0104956 0.0980526 )
------------------------------------------------------------
# Chi-Squared = 34.28 using 59 PHA bins.
# Reduced chi-squared = 0.6233 for 55 degrees of freedom
# Null hypothesis probability = 9.872016e-01
Photon flux (15-150 keV) in 136.1 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 2.580 sec. to 3.580 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08639 ( -0.0673521 0.0673014 )
Norm@50keV : 8.05881E-02 ( -0.00325525 0.00325493 )
------------------------------------------------------------
# Chi-Squared = 56.80 using 59 PHA bins.
# Reduced chi-squared = 0.9964 for 57 degrees of freedom
# Null hypothesis probability = 4.826492e-01
Photon flux (15-150 keV) in 1 sec: 9.33572 ( -0.378621 0.378699 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.46265e-07 ( -3.95372e-08 3.96511e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.580 sec. to 3.580 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.732361 ( -0.268593 0.253029 )
Epeak [keV] : 197.855 ( -62.0215 318.006 )
Norm@50keV : 0.118256 ( -0.0276418 0.0382709 )
------------------------------------------------------------
# Chi-Squared = 50.92 using 59 PHA bins.
# Reduced chi-squared = 0.9093 for 56 degrees of freedom
# Null hypothesis probability = 6.671140e-01
Photon flux (15-150 keV) in 1 sec: 9.25153 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33824e-07 ( -4.1292e-08 4.1206e-08 ) ergs/cm2
Band function
Time interval is from 2.580 sec. to 3.580 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.749379 ( -0.216772 0.298061 )
beta : -9.37167 ( 9.99954 19.9995 )
Epeak [keV] : 201.398 ( -65.8191 313.594 )
Norm@50keV : 0.116871 ( -0.0237222 0.0335234 )
------------------------------------------------------------
# Chi-Squared = 50.94 using 59 PHA bins.
# Reduced chi-squared = 0.9262 for 55 degrees of freedom
# Null hypothesis probability = 6.303362e-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:
Sun Oct 17 22:15:18 EDT 2010