batgrbproduct Analysis for Trigger=433273
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 Sep 4 18:51:31 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger433273/GCN5_download_cron
======================================================================
Trigger: 00433273 Segment: 000
BAT Trigger Time: 305256829.952 [s; MET]
Trigger Stop: 305256832 [s; MET]
UTC: 2010-09-04T01:33:43.808300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 172.918812328497 Dec: -16.208937006196 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.27
Image Trigger?: NO
Rate S/N Ratio: 12.2474487139159 [ if not an image trigger ]
Image S/N Ratio: 8.27
Flight Position: [ source = BAT ]
RA: 172.918812328497 Dec: -16.208937006196 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 172.901244022131 Dec: -16.1940793211845 [deg; J2000]
{ 11h 31m 36.3s , -16d 11' 38.7" }
+/- 1.54286027831568 [arcmin] (estimated 90% radius based on SNR)
+/- 0.597476402385541 [arcmin] (formal 1-sigma fit error)
SNR: 16.3711950477571
Angular difference between Flight and Ground position is 1.348824 arcmin
Partial Coding Fraction: 0.3085938 [ including projection effects ]
Duration
T90: 31.2999999523163 +/- 5.6391038511336
Measured from: -13.5919998884201
to: 17.7080000638962 [s; relative to TRIGTIME]
T50: 11.5719999074936 +/- 3.93725031528039
Measured from: -7.85599988698959
to: 3.716000020504 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.28799998760223
to: 3.28799998760223 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.4800000190735
to: 23.0239999890327 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.616063 0.750710 0.544148 0.147154
0.057692 0.060629 0.055512 0.052407 [error]
Peak 0.052570 0.069260 0.066491 0.005548
0.010418 0.010578 0.009583 0.008489 [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 2.00e-07 3.33e-07 4.21e-07 1.06e-06 1.25e-06 2.01e-06 erg/cm2
Error 2.86e-08 2.98e-08 5.52e-08 2.92e-07 1.29e-07 3.40e-07 erg/cm2
Peak flux Power-law 5.42e-01 5.41e-01 3.79e-01 4.20e-01 1.63e+00 1.88e+00 ph/cm2/s
Error 1.36e-01 8.93e-02 7.53e-02 1.63e-01 2.60e-01 3.02e-01 ph/cm2/s
Fluence Cutoff-PL 1.98e-07 3.38e-07 4.22e-07 8.79e-07 1.24e-06 1.84e-06 erg/cm2
Error 3.16e-08 3.54e-08 5.65e-08 5.27e-07 1.42e-07 4.21e-07 erg/cm2
Peak flux Cutoff-PL 4.40e-01 6.21e-01 4.12e-01 1.19e-01 1.56e+00 1.59e+00 ph/cm2/s
Error 1.60e-01 1.16e-01 9.19e-02 3.01e-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 1.664 0.162 - - 3.59e-03 3.47e-04 53.190 57
CPL 1.557 0.588 195.3 0.0 4.09e-03 0.00e+00 53.090 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 1.514 0.251 - - 1.30e-02 2.11e-03 65.430 57
CPL 0.156 1.286 65.0 45.5 6.68e-02 1.79e-01 60.960 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: 18.496000 sec.
T50 in the 50-300 keV band: 13.440000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 37.504 -14.480 23.024
T90 31.300 -13.592 17.708
T50 11.572 -7.856 3.716
Peak 1.000 2.288 3.288
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
172.9012 -16.1941 0.0117 35.2 -111.9 2.1641 16.4 TRIG_00433273
------------------------------------------
Foreground time interval of the image:
-14.480 23.024 (delta_t = 37.504 [sec])
Background time interval of the image:
-188.751 -91.202 (delta_t = 97.549 [sec])
-89.952 -14.480 (delta_t = 75.472 [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 -14.480 sec. to 23.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66387 ( -0.160533 0.163795 )
Norm@50keV : 3.58783E-03 ( -0.000348893 0.000344279 )
------------------------------------------------------------
# Chi-Squared = 53.19 using 59 PHA bins.
# Reduced chi-squared = 0.9332 for 57 degrees of freedom
# Null hypothesis probability = 6.186713e-01
Photon flux (15-150 keV) in 37.5 sec: 0.470648 ( -0.0420531 0.0420987 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24962e-06 ( -1.28682e-07 1.3031e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.480 sec. to 23.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55735 ( -0.614822 0.561327 )
Epeak [keV] : 195.341 ( -195.341 -195.341 )
Norm@50keV : 4.08965E-03 ( )
------------------------------------------------------------
# Chi-Squared = 53.09 using 59 PHA bins.
# Reduced chi-squared = 0.9480 for 56 degrees of freedom
# Null hypothesis probability = 5.858040e-01
Photon flux (15-150 keV) in 37.5 sec: 0.468350 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23768e-06 ( -1.44364e-07 1.39485e-07 ) ergs/cm2
Band function
Time interval is from -14.480 sec. to 23.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.58502 ( -6.52962 -6.52962 )
beta : -1.72662 ( -0.21181 0.188828 )
Epeak [keV] : 22.7845 ( -22.6299 4.52396 )
Norm@50keV : 371.108 ( -391.973 4260.08 )
------------------------------------------------------------
# Chi-Squared = 51.87 using 59 PHA bins.
# Reduced chi-squared = 0.9432 for 55 degrees of freedom
# Null hypothesis probability = 5.948215e-01
Photon flux (15-150 keV) in 37.5 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 2.288 sec. to 3.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51423 ( -0.249394 0.252814 )
Norm@50keV : 1.29862E-02 ( -0.00212109 0.00210576 )
------------------------------------------------------------
# Chi-Squared = 65.43 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.074971e-01
Photon flux (15-150 keV) in 1 sec: 1.62744 ( -0.259501 0.259905 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22918e-07 ( -2.15268e-08 2.1852e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.288 sec. to 3.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.155786 ( -1.45324 1.11944 )
Epeak [keV] : 65.0007 ( -14.5029 76.5054 )
Norm@50keV : 6.67883E-02 ( -0.0667883 0.290959 )
------------------------------------------------------------
# Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 56 degrees of freedom
# Null hypothesis probability = 3.021030e-01
Photon flux (15-150 keV) in 1 sec: 1.56431 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12445e-07 ( -2.19101e-08 2.3185e-08 ) ergs/cm2
Band function
Time interval is from 2.288 sec. to 3.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99609 ( -500.178 -485.221 )
beta : -1.79237 ( -0.436289 0.347325 )
Epeak [keV] : 29.5014 ( -7.21924 6.17196 )
Norm@50keV : 547.698 ( -389.766 2435.01 )
------------------------------------------------------------
# Chi-Squared = 60.26 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 55 degrees of freedom
# Null hypothesis probability = 2.913777e-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:
Sat Sep 4 19:06:21 EDT 2010