batgrbproduct Analysis for Trigger=435160
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 Sep 28 10:07:12 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger435160/GCN5_download_cron
======================================================================
Trigger: 00435160 Segment: 000
BAT Trigger Time: 307333198.976 [s; MET]
Trigger Stop: 307333203.072 [s; MET]
UTC: 2010-09-28T02:19:52.757060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 223.036447846036 Dec: -28.5612167730146 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.79
Image Trigger?: NO
Rate S/N Ratio: 9.16515138991168 [ if not an image trigger ]
Image S/N Ratio: 6.79
Flight Position: [ source = BAT ]
RA: 223.036447846036 Dec: -28.5612167730146 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 223.037423603361 Dec: -28.542364699775 [deg; J2000]
{ 14h 52m 09.0s , -28d 32' 32.5" }
+/- 2.2594619253983 [arcmin] (estimated 90% radius based on SNR)
+/- 1.15638684400099 [arcmin] (formal 1-sigma fit error)
SNR: 9.49285642314833
Angular difference between Flight and Ground position is 1.132293 arcmin
Partial Coding Fraction: 0.1523438 [ including projection effects ]
Duration
T90: 3.26400005817413 +/- 0.602289004952317
Measured from: 0.952000081539154
to: 4.21600013971329 [s; relative to TRIGTIME]
T50: 1.74400001764297 +/- 0.502410184115557
Measured from: 1.7360001206398
to: 3.48000013828278 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.30799996852875
to: 2.30799996852875 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.888000011444092
to: 4.42399996519089 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.189072 0.196060 0.173486 0.032181
0.036246 0.030716 0.025985 0.020395 [error]
Peak 0.096299 0.096945 0.059748 0.011477
0.019761 0.017480 0.014341 0.011030 [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 6.34e-08 9.78e-08 1.13e-07 2.52e-07 3.49e-07 5.27e-07 erg/cm2
Error 1.65e-08 1.55e-08 2.48e-08 1.18e-07 5.85e-08 1.38e-07 erg/cm2
Peak flux Power-law 1.23e+00 8.03e-01 3.41e-01 1.97e-01 2.47e+00 2.57e+00 ph/cm2/s
Error 3.26e-01 1.50e-01 1.17e-01 1.30e-01 4.60e-01 4.74e-01 ph/cm2/s
Fluence Cutoff-PL 6.23e-08 9.87e-08 1.14e-07 2.22e-07 3.47e-07 4.71e-07 erg/cm2
Error 1.76e-08 1.73e-08 2.65e-08 1.92e-07 6.04e-08 1.78e-07 erg/cm2
Peak flux Cutoff-PL 1.23e+00 8.03e-01 3.40e-01 1.96e-01 2.47e+00 2.57e+00 ph/cm2/s
Error 3.26e-01 1.50e-01 1.17e-01 4.74e-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 1.788 0.287 - - 1.07e-02 1.75e-03 41.980 57
CPL 1.736 1.197 257.2 0.0 1.14e-02 0.00e+00 41.960 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 2.238 0.391 - - 1.46e-02 3.79e-03 71.510 57
CPL 1.962 0.000 7.6 0.0 1.99e-02 0.00e+00 72.060 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: 3.328000 sec.
T50 in the 50-300 keV band: 1.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 3.536 0.888 4.424
T90 3.264 0.952 4.216
T50 1.744 1.736 3.480
Peak 1.000 1.308 2.308
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
223.0374 -28.5424 0.0202 37.8 -93.2 0.6138 9.5 TRIG_00435160
------------------------------------------
Foreground time interval of the image:
0.888 4.424 (delta_t = 3.536 [sec])
Background time interval of the image:
-239.976 0.888 (delta_t = 240.864 [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 0.888 sec. to 4.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78779 ( -0.28034 0.293995 )
Norm@50keV : 1.07107E-02 ( -0.00177171 0.001738 )
------------------------------------------------------------
# Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7366 for 57 degrees of freedom
# Null hypothesis probability = 9.317813e-01
Photon flux (15-150 keV) in 3.536 sec: 1.46898 ( -0.237797 0.239232 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48823e-07 ( -5.81948e-08 5.87662e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.888 sec. to 4.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73579 ( -1.13132 1.26209 )
Epeak [keV] : 257.188 ( )
Norm@50keV : 1.13676E-02 ( )
------------------------------------------------------------
# Chi-Squared = 41.96 using 59 PHA bins.
# Reduced chi-squared = 0.7493 for 56 degrees of freedom
# Null hypothesis probability = 9.181068e-01
Photon flux (15-150 keV) in 3.536 sec: 1.46198 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4729e-07 ( -6.05968e-08 6.01385e-08 ) ergs/cm2
Band function
Time interval is from 0.888 sec. to 4.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.51148 ( 7.4718 2.51148 )
beta : -1.78779 ( -0.293995 0.280338 )
Epeak [keV] : 83.1248 ( -83.1248 -83.1248 )
Norm@50keV : 1.45574 ( -0.240809 0.236221 )
------------------------------------------------------------
# Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7634 for 55 degrees of freedom
# Null hypothesis probability = 9.015003e-01
Photon flux (15-150 keV) in 3.536 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 1.308 sec. to 2.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.23791 ( -0.362469 0.418566 )
Norm@50keV : 1.46369E-02 ( -0.00391572 0.00365972 )
------------------------------------------------------------
# Chi-Squared = 71.51 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 57 degrees of freedom
# Null hypothesis probability = 9.349942e-02
Photon flux (15-150 keV) in 1 sec: 2.47252 ( -0.459978 0.460435 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38396e-07 ( -3.00698e-08 3.07701e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96176 ( )
Epeak [keV] : 7.63558 ( )
Norm@50keV : 1.99154E-02 ( )
------------------------------------------------------------
# Chi-Squared = 72.06 using 59 PHA bins.
# Reduced chi-squared = 1.287 for 56 degrees of freedom
# Null hypothesis probability = 7.294440e-02
Photon flux (15-150 keV) in 1 sec: 2.47158 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38392e-07 ( -3.0075e-08 3.0776e-08 ) ergs/cm2
Band function
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.65907 ( 1.66029 1.66029 )
beta : -2.23259 ( 2.23562 0.3603 )
Epeak [keV] : 7.08071 ( -6.84541 -6.84541 )
Norm@50keV : 5.92655E-02 ( -0.0600247 55.9173 )
------------------------------------------------------------
# Chi-Squared = 71.51 using 59 PHA bins.
# Reduced chi-squared = 1.300 for 55 degrees of freedom
# Null hypothesis probability = 6.658163e-02
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:
Tue Sep 28 10:21:58 EDT 2010