batgrbproduct Analysis for Trigger=431454
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): Thu Aug 12 22:09:09 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger431454/GCN5_download_cron
======================================================================
Trigger: 00431454 Segment: 000
BAT Trigger Time: 303266104 [s; MET]
Trigger Stop: 303266168 [s; MET]
UTC: 2010-08-12T00:34:57.928060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 195.314827929098 Dec: -61.6136448685352 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 21.31
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 21.31
Flight Position: [ source = BAT ]
RA: 195.314827929098 Dec: -61.6136448685352 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 195.323089855081 Dec: -61.6143717609481 [deg; J2000]
{ 13h 01m 17.5s , -61d 36' 51.7" }
+/- 1.16881001375143 [arcmin] (estimated 90% radius based on SNR)
+/- 0.368681919517172 [arcmin] (formal 1-sigma fit error)
SNR: 24.3411642021684
Angular difference between Flight and Ground position is 0.239669 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 768.655999958515 +/- 179.695139068608
Measured from: -59.1077998876572
to: 709.548200070858 [s; relative to TRIGTIME]
T50: 270.331999957561 +/- 29.3399153099953
Measured from: 54.5682001113892
to: 324.900200068951 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -80.4277999997139
to: -79.4277999997139 [s; relative to TRIGTIME]
Total Fluence
Measured from: -80.3518000245094
to: 796.128199994564 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 15.980568 10.804530 0.607480 -0.021724
0.160368 0.159218 0.136115 0.124106 [error]
Peak 0.054951 0.023660 0.000456 0.012809
0.016296 0.017025 0.014925 0.013004 [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 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 Power-law 3.94e-01 2.15e-01 7.33e-02 3.25e-02 7.00e-01 7.15e-01 ph/cm2/s
Error 2.10e-01 1.34e-01 9.05e-02 8.68e-02 3.56e-01 3.75e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-05 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 Cutoff-PL 4.37e-01 2.24e-01 7.69e-03 2.77e-06 6.68e-01 6.68e-01 ph/cm2/s
Error 2.55e-01 1.98e-01 8.34e-02 3.30e-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 3.436 0.000 - - 8.81e-04 0.00e+00 265.640 57
CPL 1.000 0.000 50.0 0.0 3.26e-03 0.00e+00 1365.760 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 2.551 1.271 - - 3.45e-03 3.43e-03 49.850 57
CPL 0.078 0.000 20.2 0.0 2.52e-01 0.00e+00 49.350 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 876.480 -80.352 796.128
T90 768.656 -59.108 709.548
T50 270.332 54.568 324.900
Peak 1.000 -80.428 -79.428
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
195.3231 -61.6144 0.0079 2.2 -52.0 2.3090 24.3 TRIG_00431454
------------------------------------------
Foreground time interval of the image:
-7.499 71.101 (delta_t = 78.600 [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
Multiple GTIs in the spectrum
tstart tstop
-80.351800 309.300000
310.000000 718.490000
720.000000 796.128200
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.43644 ( )
Norm@50keV : 8.81019E-04 ( )
------------------------------------------------------------
# Chi-Squared = 265.64 using 59 PHA bins.
# Reduced chi-squared = 4.6604 for 57 degrees of freedom
# Null hypothesis probability = 1.114282e-28
Photon flux (15-150 keV) in 874.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-80.351800 309.300000
310.000000 718.490000
720.000000 796.128200
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.26295E-03 ( )
------------------------------------------------------------
# Chi-Squared = 1365.76 using 59 PHA bins.
# Reduced chi-squared = 24.3886 for 56 degrees of freedom
# Null hypothesis probability = 8.631723e-249
Photon flux (15-150 keV) in 874.3 sec: 0.270497 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-80.351800 309.300000
310.000000 718.490000
720.000000 796.128200
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.48074 ( -0.981624 0.650645 )
beta : -6.77414 ( 5.58815 0.00876411 )
Epeak [keV] : 22.6144 ( -1.77807 0.927143 )
Norm@50keV : 1.41617 ( -0.949178 3.20517 )
------------------------------------------------------------
# Chi-Squared = 42.63 using 59 PHA bins.
# Reduced chi-squared = 0.7751 for 55 degrees of freedom
# Null hypothesis probability = 8.881756e-01
Photon flux (15-150 keV) in 874.3 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 -80.428 sec. to -79.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55093 ( -0.992391 1.54874 )
Norm@50keV : 3.45213E-03 ( -0.00345222 0.00340909 )
------------------------------------------------------------
# Chi-Squared = 49.85 using 59 PHA bins.
# Reduced chi-squared = 0.8745 for 57 degrees of freedom
# Null hypothesis probability = 7.379821e-01
Photon flux (15-150 keV) in 1 sec: 0.699895 ( -0.352369 0.358744 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50156e-08 ( -2.13544e-08 2.80728e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -80.428 sec. to -79.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.77475E-02 ( )
Epeak [keV] : 20.2073 ( )
Norm@50keV : 0.251663 ( )
------------------------------------------------------------
# Chi-Squared = 49.35 using 59 PHA bins.
# Reduced chi-squared = 0.8813 for 56 degrees of freedom
# Null hypothesis probability = 7.227461e-01
Photon flux (15-150 keV) in 1 sec: 0.668070 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56824e-08 ( -1.44948e-08 3.37762e-08 ) ergs/cm2
Band function
Time interval is from -80.428 sec. to -79.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.24081 ( 1.06555 1.06555 )
beta : -3.30577 ( 3.92539 4.63084 )
Epeak [keV] : 19.9344 ( -19.861 51.9381 )
Norm@50keV : 1159.62 ( -1229.6 1032.25 )
------------------------------------------------------------
# Chi-Squared = 48.93 using 59 PHA bins.
# Reduced chi-squared = 0.8896 for 55 degrees of freedom
# Null hypothesis probability = 7.045159e-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:
Thu Aug 12 22:48:29 EDT 2010