batgrbproduct Analysis for Trigger=432983
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 Aug 31 13:46:49 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger432983/GCN5_download_cron
======================================================================
Trigger: 00432983 Segment: 000
BAT Trigger Time: 304904064 [s; MET]
Trigger Stop: 304904136 [s; MET]
UTC: 2010-08-30T23:34:17.869020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 186.651223789699 Dec: -62.7779115408472 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 27.6
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 27.6
Flight Position: [ source = BAT ]
RA: 186.651223789699 Dec: -62.7779115408472 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 186.652669973416 Dec: -62.7738714079823 [deg; J2000]
{ 12h 26m 36.6s , -62d 46' 25.9" }
+/- 0.477284217979741 [arcmin] (estimated 90% radius based on SNR)
+/- 0.0995011002753854 [arcmin] (formal 1-sigma fit error)
SNR: 87.5000445493875
Angular difference between Flight and Ground position is 0.245637 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 757.727999925613 +/- 6.82017008675125
Measured from: -52.0239998698235
to: 705.70400005579 [s; relative to TRIGTIME]
T50: 386.40399992466 +/- 8.98103445726338
Measured from: 48.9240001440048
to: 435.328000068665 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 117.648000001907
to: 118.648000001907 [s; relative to TRIGTIME]
Total Fluence
Measured from: -91.2639999985695
to: 792.508000016212 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 77.937512 22.751612 0.594169 0.357557
0.191852 0.168689 0.139806 0.127297 [error]
Peak 0.165117 0.054125 0.006583 0.005054
0.007010 0.005820 0.004376 0.003946 [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 1.44e+00 4.55e-01 7.95e-02 1.61e-02 1.99e+00 1.99e+00 ph/cm2/s
Error 9.19e-02 5.13e-02 1.85e-02 6.14e-03 1.33e-01 1.34e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 1.61e+00 4.20e-01 3.22e-03 4.83e-08 2.03e+00 2.03e+00 ph/cm2/s
Error 1.08e-01 7.10e-02 5.14e-03 1.28e-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 5.116 0.000 - - 8.24e-04 0.00e+00 449.020 57
CPL 1.000 0.000 50.0 0.0 2.84e-03 0.00e+00 3049.760 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 3.517 0.189 - - 4.85e-03 9.10e-04 88.580 57
CPL 1.000 0.000 50.0 0.0 3.17e-02 0.00e+00 434.500 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 883.772 -91.264 792.508
T90 757.728 -52.024 705.704
T50 386.404 48.924 435.328
Peak 1.000 117.648 118.648
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
186.6527 -62.7739 0.0022 4.0 34.1 11.2460 87.5 TRIG_00432983
------------------------------------------
Foreground time interval of the image:
-8.699 82.101 (delta_t = 90.800 [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
-91.264000 347.300000
348.000000 792.508000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.11562 ( )
Norm@50keV : 8.23763E-04 ( )
------------------------------------------------------------
# Chi-Squared = 449.02 using 59 PHA bins.
# Reduced chi-squared = 7.8776 for 57 degrees of freedom
# Null hypothesis probability = 2.834754e-62
Photon flux (15-150 keV) in 883.1 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
-91.264000 347.300000
348.000000 792.508000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.83892E-03 ( )
------------------------------------------------------------
# Chi-Squared = 3049.76 using 59 PHA bins.
# Reduced chi-squared = 54.4600 for 56 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Photon flux (15-150 keV) in 883.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-91.264000 347.300000
348.000000 792.508000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47660 ( )
beta : -9.37167 ( )
Epeak [keV] : 27.5221 ( )
Norm@50keV : 2.77923E-03 ( )
------------------------------------------------------------
# Chi-Squared = 2717.45 using 59 PHA bins.
# Reduced chi-squared = 49.4082 for 55 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Photon flux (15-150 keV) in 883.1 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
Peak spectrum fit
Power-law model
Time interval is from 117.648 sec. to 118.648 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.51670 ( -0.182111 0.196531 )
Norm@50keV : 4.84590E-03 ( -0.000877442 0.000941979 )
------------------------------------------------------------
# Chi-Squared = 88.58 using 59 PHA bins.
# Reduced chi-squared = 1.554 for 57 degrees of freedom
# Null hypothesis probability = 4.662662e-03
Photon flux (15-150 keV) in 1 sec: 1.98664 ( -0.133091 0.133322 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.70384e-08 ( -6.62483e-09 6.84614e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 117.648 sec. to 118.648 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.17446E-02 ( )
------------------------------------------------------------
# Chi-Squared = 434.50 using 59 PHA bins.
# Reduced chi-squared = 7.7589 for 56 degrees of freedom
# Null hypothesis probability = 5.857098e-60
Photon flux (15-150 keV) in 1 sec: 2.03454 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.95697e-08 ( -5.0056e-09 5.1168e-09 ) ergs/cm2
Band function
Time interval is from 117.648 sec. to 118.648 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51541 ( )
beta : -4.44703 ( )
Epeak [keV] : 29.1569 ( )
Norm@50keV : 2.66399E-02 ( )
------------------------------------------------------------
# Chi-Squared = 315.56 using 59 PHA bins.
# Reduced chi-squared = 5.7374 for 55 degrees of freedom
# Null hypothesis probability = 3.060818e-38
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 Aug 31 14:13:18 EDT 2010