batgrbproduct Analysis for Trigger=434931
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 Sep 26 01:13:04 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger434931/GCN5_download_cron
======================================================================
Trigger: 00434931 Segment: 000
BAT Trigger Time: 307100840 [s; MET]
Trigger Stop: 307100904 [s; MET]
UTC: 2010-09-25T09:47:13.789540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 254.739181031072 Dec: -15.1913348712606 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 254.739181031072 Dec: -15.1913348712606 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 254.73706676363 Dec: -15.2358195160024 [deg; J2000]
{ 16h 58m 56.9s , -15d 14' 09.0" }
+/- 3.10223345750368 [arcmin] (estimated 90% radius based on SNR)
+/- 1.65142621376477 [arcmin] (formal 1-sigma fit error)
SNR: 6.03568087785981
Angular difference between Flight and Ground position is 2.671884 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.254154 0.163212 0.103358 0.085285
0.049931 0.046562 0.042326 0.043651 [error]
Peak 0.254154 0.163212 0.103358 0.085285
0.049931 0.046562 0.042326 0.043651 [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 6.88e-08 7.52e-08 5.85e-08 7.48e-08 2.31e-07 2.77e-07 erg/cm2
Error 2.16e-08 2.25e-08 3.54e-08 1.02e-07 8.08e-08 1.40e-07 erg/cm2
Peak flux Power-law 3.60e-02 2.17e-02 8.33e-03 4.28e-03 6.83e-02 7.03e-02 ph/cm2/s
Error 1.09e-02 6.17e-03 4.82e-03 5.35e-03 1.68e-02 1.78e-02 ph/cm2/s
Fluence Cutoff-PL 6.89e-08 7.53e-08 5.85e-08 7.41e-08 2.31e-07 2.74e-07 erg/cm2
Error 2.16e-08 2.26e-08 3.54e-08 1.01e-07 8.08e-08 1.33e-07 erg/cm2
Peak flux Cutoff-PL 3.60e-02 2.17e-02 8.32e-03 4.25e-03 6.82e-02 7.03e-02 ph/cm2/s
Error 1.09e-02 6.18e-03 4.82e-03 1.78e-02 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 2.362 0.611 - - 3.72e-04 1.64e-04 47.180 57
CPL 2.433 0.556 183.4 0.0 3.22e-04 4.16e-02 47.140 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 2.379 0.591 - - 3.73e-04 1.64e-04 47.900 57
CPL 1.987 0.000 1.2 0.0 6.48e-04 0.00e+00 48.210 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.7371 -15.2358 0.0317 0.0 168.5 0.5974 6.0 TRIG_00434931
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36175 ( -0.548238 0.672791 )
Norm@50keV : 3.72488E-04 ( -0.000164812 0.000163546 )
------------------------------------------------------------
# Chi-Squared = 47.18 using 59 PHA bins.
# Reduced chi-squared = 0.8277 for 57 degrees of freedom
# Null hypothesis probability = 8.200047e-01
Photon flux (15-150 keV) in 64 sec: 6.74078E-02 ( -0.0170495 0.0170765 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30605e-07 ( -7.61293e-08 8.55213e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43347 ( -1.10201 0.0104534 )
Epeak [keV] : 183.438 ( )
Norm@50keV : 3.22129E-04 ( -0.000327091 0.0829168 )
------------------------------------------------------------
# Chi-Squared = 47.14 using 59 PHA bins.
# Reduced chi-squared = 0.8418 for 56 degrees of freedom
# Null hypothesis probability = 7.945212e-01
Photon flux (15-150 keV) in 64 sec: 6.73796E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30534e-07 ( -7.60998e-08 8.5495e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.20311 ( 0.221836 0.221836 )
beta : -2.46624 ( 2.44042 0.61861 )
Epeak [keV] : 18.4875 ( -17.6311 363.965 )
Norm@50keV : 2.44922 ( -2.44456 277.401 )
------------------------------------------------------------
# Chi-Squared = 47.07 using 59 PHA bins.
# Reduced chi-squared = 0.8559 for 55 degrees of freedom
# Null hypothesis probability = 7.676492e-01
Photon flux (15-150 keV) in 64 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37905 ( -0.52948 0.652035 )
Norm@50keV : 3.73419E-04 ( -0.00016358 0.00016351 )
------------------------------------------------------------
# Chi-Squared = 47.90 using 59 PHA bins.
# Reduced chi-squared = 0.8404 for 57 degrees of freedom
# Null hypothesis probability = 7.991809e-01
Photon flux (15-150 keV) in 64 sec: 6.82539E-02 ( -0.0167449 0.0167876 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32042e-07 ( -7.55347e-08 8.49306e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98741 ( )
Epeak [keV] : 1.20551 ( )
Norm@50keV : 6.47571E-04 ( )
------------------------------------------------------------
# Chi-Squared = 48.21 using 59 PHA bins.
# Reduced chi-squared = 0.8610 for 56 degrees of freedom
# Null hypothesis probability = 7.608699e-01
Photon flux (15-150 keV) in 64 sec: 6.82259E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31969e-07 ( -7.55053e-08 8.49043e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.27047 ( 0.099068 0.099068 )
beta : -2.49003 ( 2.45982 0.59807 )
Epeak [keV] : 18.1675 ( -17.2991 29.2123 )
Norm@50keV : 3.09981 ( -3.13971 311.812 )
------------------------------------------------------------
# Chi-Squared = 47.76 using 59 PHA bins.
# Reduced chi-squared = 0.8684 for 55 degrees of freedom
# Null hypothesis probability = 7.450128e-01
Photon flux (15-150 keV) in 64 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 Sep 26 01:28:31 EDT 2010