batgrbproduct Analysis for Trigger=347663
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): Fri Jun 3 10:52:58 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger347663/SDC
======================================================================
Trigger: 00347663 Segment: 000
BAT Trigger Time: 259818546.24 [s; MET]
Trigger Stop: 259818547.264 [s; MET]
UTC: 2009-03-27T03:49:01.631820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.748240528487 Dec: 61.2664798892107 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.76
Image Trigger?: NO
Rate S/N Ratio: 8.48528137423857 [ if not an image trigger ]
Image S/N Ratio: 5.76
Flight Position: [ source = BAT ]
RA: 271.748240528487 Dec: 61.2664798892107 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.711420076853 Dec: 61.244148871528 [deg; J2000]
{ 18h 06m 50.7s , +61d 14' 38.9" }
+/- 5.05220358609775 [arcmin] (estimated 90% radius based on SNR)
+/- 3.14663799565869 [arcmin] (formal 1-sigma fit error)
SNR: 3.00708529876861
Angular difference between Flight and Ground position is 1.709969 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001080 -0.003437 0.010459 0.019024
0.004838 0.005028 0.004630 0.004243 [error]
Peak 0.001080 -0.003437 0.010459 0.019024
0.004838 0.005028 0.004630 0.004243 [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 6.46e-11 6.57e-10 6.04e-09 3.67e-07 2.48e-08 3.74e-07 erg/cm2
Error 2.23e-10 1.10e-09 5.28e-09 3.20e-07 1.40e-08 3.24e-07 erg/cm2
Peak flux Power-law 1.92e-03 1.02e-02 4.70e-02 8.86e-01 1.46e-01 9.45e-01 ph/cm2/s
Error 6.80e-03 1.79e-02 4.22e-02 7.49e-01 9.21e-02 5.93e-01 ph/cm2/s
Fluence Cutoff-PL 1.09e-13 5.79e-11 6.13e-09 2.95e-08 5.85e-08 0.00e+00 erg/cm2
Error 7.85e-11 8.91e-10 6.16e-09 1.27e-08 5.79e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.01e-06 8.10e-04 4.47e-02 2.03e-01 1.59e-01 2.47e-01 ph/cm2/s
Error 4.70e-03 1.43e-02 4.71e-02 1.28e+00 7.33e-02 1.19e+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 -1.206 1.052 - - 5.72e-04 7.49e-04 59.640 57
CPL -9.642 1.694 155.0 0.0 4.23e-03 0.00e+00 58.580 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 -1.206 1.052 - - 5.72e-04 7.49e-04 59.640 57
CPL -9.642 1.694 155.0 0.0 4.23e-03 0.00e+00 58.580 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.7114 +61.2441 0.0641 10.1 -22.7 0.0287 3.0 TRIG_00347663
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-27.739 -10.240 (delta_t = 17.499 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.20648 ( -0.91394 1.19039 )
Norm@50keV : 5.71818E-04 ( -0.000574806 0.000923465 )
------------------------------------------------------------
# Chi-Squared = 59.64 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.799076e-01
Photon flux (15-150 keV) in 1.024 sec: 0.145793 ( -0.0976378 0.0866535 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48041e-08 ( -1.58538e-08 1.21014e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.64227 ( -1.15893 2.2289 )
Epeak [keV] : 155.036 ( )
Norm@50keV : 4.23057E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 56 degrees of freedom
# Null hypothesis probability = 3.808097e-01
Photon flux (15-150 keV) in 1.024 sec: 0.158544 ( -0.0762704 0.070299 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9458e-08 ( -1.26986e-08 1.26896e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38550 ( -0.39122 -0.39122 )
beta : -1.43525 ( 1.18015 3.23683 )
Epeak [keV] : 188.403 ( -179.055 735.947 )
Norm@50keV : 2.51711E-03 ( -0.00250483 0.00584705 )
------------------------------------------------------------
# Chi-Squared = 58.99 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.317372e-01
Photon flux (15-150 keV) in 1.024 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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.20648 ( -0.91394 1.19039 )
Norm@50keV : 5.71818E-04 ( -0.000574806 0.000923465 )
------------------------------------------------------------
# Chi-Squared = 59.64 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.799076e-01
Photon flux (15-150 keV) in 1.024 sec: 0.145793 ( -0.0976378 0.0866535 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48041e-08 ( -1.58538e-08 1.21014e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.64227 ( -1.15893 2.2289 )
Epeak [keV] : 155.036 ( )
Norm@50keV : 4.23057E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 56 degrees of freedom
# Null hypothesis probability = 3.808097e-01
Photon flux (15-150 keV) in 1.024 sec: 0.158544 ( -0.0762704 0.070299 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9458e-08 ( -1.26986e-08 1.26896e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38550 ( -0.39122 -0.39122 )
beta : -1.43525 ( 1.18015 3.23683 )
Epeak [keV] : 188.403 ( -179.055 735.947 )
Norm@50keV : 2.51711E-03 ( -0.00250483 0.00584705 )
------------------------------------------------------------
# Chi-Squared = 58.99 using 59 PHA bins.
# Reduced chi-squared = 1.073 for 55 degrees of freedom
# Null hypothesis probability = 3.317372e-01
Photon flux (15-150 keV) in 1.024 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:
Fri Jun 3 11:08:39 EDT 2011