batgrbproduct Analysis for Trigger=352417
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 v2.44
Process Start Time (local time): Tue May 19 13:27:07 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger352417/SDC
======================================================================
Trigger: 00352417 Segment: 000
BAT Trigger Time: 264303870.144 [s; MET]
Trigger Stop: 264303897.024 [s; MET]
UTC: 2009-05-18T01:44:25.393660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 129.575027997059 Dec: -24.4131240347089 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.69
Image Trigger?: NO
Rate S/N Ratio: 33.9852909359329 [ if not an image trigger ]
Image S/N Ratio: 5.69
Flight Position: [ source = BAT ]
RA: 129.575027997059 Dec: -24.4131240347089 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 129.643469041047 Dec: -24.3946583364267 [deg; J2000]
{ 08h 38m 34.4s , -24d 23' 40.8" }
+/- 3.83780491484311 [arcmin] (estimated 90% radius based on SNR)
+/- 2.39747185459858 [arcmin] (formal 1-sigma fit error)
SNR: 4.45363113788252
Angular difference between Flight and Ground position is 3.900249 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
T50: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.8799999952316 second)
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.105890 0.063309 0.001047 -0.011332
0.028974 0.027638 0.022457 0.019808 [error]
Peak 0.105890 0.063309 0.001047 -0.011332
0.028974 0.027638 0.022457 0.019808 [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 2.32e-08 2.38e-08 1.71e-08 1.96e-08 7.18e-08 8.56e-08 erg/cm2
Error 1.13e-08 1.21e-08 1.72e-08 3.58e-08 3.92e-08 6.01e-08 erg/cm2
Peak flux Power-law 2.85e-02 1.62e-02 5.83e-03 2.75e-03 5.20e-02 5.34e-02 ph/cm2/s
Error 1.41e-02 8.07e-03 5.75e-03 4.63e-03 2.34e-02 2.43e-02 ph/cm2/s
Fluence Cutoff-PL 2.37e-08 3.47e-08 4.18e-09 7.25e-12 6.26e-08 6.25e-08 erg/cm2
Error 1.35e-08 2.67e-08 1.24e-08 4.69e-09 2.98e-08 2.99e-08 erg/cm2
Peak flux Cutoff-PL 2.79e-02 2.43e-02 1.68e-03 1.58e-06 5.39e-02 5.39e-02 ph/cm2/s
Error 1.64e-02 1.84e-02 4.39e-03 7.96e-04 2.19e-02 2.19e-02 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 2.446 0.848 - - 2.74e-04 1.81e-04 54.350 57
CPL -1.935 0.000 28.0 0.0 2.78e-01 0.00e+00 50.840 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 2.446 0.848 - - 2.74e-04 1.81e-04 54.350 57
CPL -1.935 0.000 28.0 0.0 2.78e-01 0.00e+00 50.840 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 26.880 0.000 26.880
T90 26.880 0.000 26.880
T50 26.880 0.000 26.880
Peak 26.880 0.000 26.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
129.6435 -24.3947 0.0432 15.0 -168.4 0.3625 4.5 TRIG_00352417
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-60.144 -46.144 (delta_t = 14.000 [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 0.000 sec. to 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44593 ( -0.743169 0.952391 )
Norm@50keV : 2.74327E-04 ( -0.000175759 0.000187161 )
------------------------------------------------------------
# Chi-Squared = 54.35 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 57 degrees of freedom
# Null hypothesis probability = 5.751359e-01
Photon flux (15-150 keV) in 26.88 sec: 5.20448E-02 ( -0.0233035 0.0234245 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1765e-08 ( -3.58472e-08 4.25271e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.93534 ( )
Epeak [keV] : 27.9935 ( )
Norm@50keV : 0.277896 ( )
------------------------------------------------------------
# Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.9079 for 56 degrees of freedom
# Null hypothesis probability = 6.698659e-01
Photon flux (15-150 keV) in 26.88 sec: 5.38685E-02 ( -0.0217114 0.0220888 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25968e-08 ( -2.75418e-08 3.19985e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.88887 ( -3.85054 -1.824 )
beta : -9.99969 ( 10113 10123 )
Epeak [keV] : 27.9501 ( -23.3622 11.2838 )
Norm@50keV : 1.33483 ( -1.37012 22.014 )
------------------------------------------------------------
# Chi-Squared = 50.79 using 59 PHA bins.
# Reduced chi-squared = 0.9234 for 55 degrees of freedom
# Null hypothesis probability = 6.362752e-01
Photon flux (15-150 keV) in 26.88 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 0.000 sec. to 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44593 ( -0.743169 0.952391 )
Norm@50keV : 2.74327E-04 ( -0.000175759 0.000187161 )
------------------------------------------------------------
# Chi-Squared = 54.35 using 59 PHA bins.
# Reduced chi-squared = 0.9535 for 57 degrees of freedom
# Null hypothesis probability = 5.751359e-01
Photon flux (15-150 keV) in 26.88 sec: 5.20448E-02 ( -0.0233035 0.0234245 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1765e-08 ( -3.58477e-08 4.25271e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.93534 ( )
Epeak [keV] : 27.9935 ( )
Norm@50keV : 0.277896 ( )
------------------------------------------------------------
# Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.9079 for 56 degrees of freedom
# Null hypothesis probability = 6.698659e-01
Photon flux (15-150 keV) in 26.88 sec: 5.38685E-02 ( -0.0217114 0.0220888 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25968e-08 ( -2.75418e-08 3.19985e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.88887 ( -3.85054 -1.824 )
beta : -9.99969 ( 10113 10123 )
Epeak [keV] : 27.9501 ( -22.9879 11.9725 )
Norm@50keV : 1.33483 ( -1.37012 22.014 )
------------------------------------------------------------
# Chi-Squared = 50.79 using 59 PHA bins.
# Reduced chi-squared = 0.9234 for 55 degrees of freedom
# Null hypothesis probability = 6.362752e-01
Photon flux (15-150 keV) in 26.88 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:
Wed Jun 1 17:45:02 EDT 2011