batgrbproduct Analysis for Trigger=347667
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 10:06:54 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger347667/SDC
======================================================================
Trigger: 00347667 Segment: 000
BAT Trigger Time: 259820706.176 [s; MET]
Trigger Stop: 259820707.2 [s; MET]
UTC: 2009-03-27T04:25:01.567740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 303.151487470522 Dec: 4.93948400257528 [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: 7.54983443527075 [ if not an image trigger ]
Image S/N Ratio: 5.69
Flight Position: [ source = BAT ]
RA: 303.151487470522 Dec: 4.93948400257528 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 303.161742959616 Dec: 4.91998897273872 [deg; J2000]
{ 20h 12m 38.8s , +04d 55' 12.0" }
+/- 2.8406704599524 [arcmin] (estimated 90% radius based on SNR)
+/- 1.16009278931227 [arcmin] (formal 1-sigma fit error)
SNR: 6.84501337860852
Angular difference between Flight and Ground position is 1.320620 arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 0.783999979496002 +/- 0.244229415010503
Measured from: 0.224000006914139
to: 1.00799998641014 [s; relative to TRIGTIME]
T50: 0.399999976158142 +/- 0.266293049028351
Measured from: 0.46399998664856
to: 0.863999962806702 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.11599999666214
to: 1.11599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.175999999046326
to: 1.05599999427795 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.022511 0.026483 0.024925 0.007411
0.007299 0.007255 0.006400 0.005432 [error]
Peak 0.022753 0.023739 0.022078 0.007393
0.007751 0.007710 0.006797 0.005798 [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 6.10e-09 1.20e-08 1.84e-08 6.13e-08 5.14e-08 9.78e-08 erg/cm2
Error 3.03e-09 3.63e-09 5.88e-09 4.51e-08 1.46e-08 4.84e-08 erg/cm2
Peak flux Power-law 1.94e-01 1.97e-01 1.42e-01 1.63e-01 5.96e-01 6.96e-01 ph/cm2/s
Error 1.11e-01 6.92e-02 5.48e-02 1.37e-01 1.94e-01 2.17e-01 ph/cm2/s
Fluence Cutoff-PL 6.10e-09 1.20e-08 1.84e-08 6.08e-08 5.14e-08 8.49e-08 erg/cm2
Error 3.37e-09 3.89e-09 6.46e-09 5.79e-08 1.48e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.96e-01 1.98e-01 1.42e-01 1.62e-01 5.98e-01 6.94e-01 ph/cm2/s
Error 1.10e-01 7.18e-02 5.04e-02 1.35e-01 1.93e-01 2.37e-01 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 1.387 0.484 - - 6.03e-03 1.59e-03 38.150 57
CPL 1.384 1.964 9999.2 0.0 6.06e-03 1.97e-02 38.150 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 1.478 0.592 - - 4.81e-03 1.51e-03 35.550 57
CPL 2.080 0.000 31.4 0.0 2.19e-03 0.00e+00 35.470 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 0.880 0.176 1.056
T90 0.784 0.224 1.008
T50 0.400 0.464 0.864
Peak 1.000 0.116 1.116
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
303.1617 +4.9200 0.0279 39.0 -8.1 0.0922 6.8 TRIG_00347667
------------------------------------------
Foreground time interval of the image:
0.176 1.056 (delta_t = 0.880 [sec])
Background time interval of the image:
-326.475 -292.104 (delta_t = 34.371 [sec])
-60.176 0.176 (delta_t = 60.352 [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 0.176 sec. to 1.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38698 ( -0.488958 0.478909 )
Norm@50keV : 6.03435E-03 ( -0.0015937 0.00159394 )
------------------------------------------------------------
# Chi-Squared = 38.15 using 59 PHA bins.
# Reduced chi-squared = 0.6693 for 57 degrees of freedom
# Null hypothesis probability = 9.741133e-01
Photon flux (15-150 keV) in 0.88 sec: 0.732726 ( -0.204886 0.206499 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.14494e-08 ( -1.45242e-08 1.46603e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.176 sec. to 1.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38352 ( -1.90149 2.02711 )
Epeak [keV] : 9999.19 ( )
Norm@50keV : 6.05691E-03 ( -0.0016012 0.0378163 )
------------------------------------------------------------
# Chi-Squared = 38.15 using 59 PHA bins.
# Reduced chi-squared = 0.6812 for 56 degrees of freedom
# Null hypothesis probability = 9.674289e-01
Photon flux (15-150 keV) in 0.88 sec: 0.733554 ( -0.201212 0.205228 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.14408e-08 ( -1.48812e-08 1.46802e-08 ) ergs/cm2
Band function
Time interval is from 0.176 sec. to 1.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.90945 ( 3.28998 2.90945 )
beta : -1.38698 ( -0.478136 0.488235 )
Epeak [keV] : 149.072 ( -149.072 -149.072 )
Norm@50keV : 0.820154 ( -0.216626 0.216641 )
------------------------------------------------------------
# Chi-Squared = 38.15 using 59 PHA bins.
# Reduced chi-squared = 0.6936 for 55 degrees of freedom
# Null hypothesis probability = 9.593282e-01
Photon flux (15-150 keV) in 0.88 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 0.116 sec. to 1.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47766 ( -0.589785 0.595088 )
Norm@50keV : 4.80643E-03 ( -0.00152133 0.00149981 )
------------------------------------------------------------
# Chi-Squared = 35.55 using 59 PHA bins.
# Reduced chi-squared = 0.6238 for 57 degrees of freedom
# Null hypothesis probability = 9.884418e-01
Photon flux (15-150 keV) in 1 sec: 0.596497 ( -0.192947 0.194295 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.57675e-08 ( -1.54585e-08 1.56819e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08045 ( )
Epeak [keV] : 31.4415 ( )
Norm@50keV : 2.18980E-03 ( )
------------------------------------------------------------
# Chi-Squared = 35.47 using 59 PHA bins.
# Reduced chi-squared = 0.6335 for 56 degrees of freedom
# Null hypothesis probability = 9.853660e-01
Photon flux (15-150 keV) in 1 sec: 0.597531 ( -0.193887 0.19254 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.57701e-08 ( -1.54452e-08 1.55108e-08 ) ergs/cm2
Band function
Time interval is from 0.116 sec. to 1.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.24991 ( 1.24998 1.24998 )
beta : -1.47756 ( 1.47764 0.589561 )
Epeak [keV] : 37.6559 ( -37.6221 -37.6221 )
Norm@50keV : 8.44535E-03 ( -0.00511716 0.848959 )
------------------------------------------------------------
# Chi-Squared = 35.55 using 59 PHA bins.
# Reduced chi-squared = 0.6464 for 55 degrees of freedom
# Null hypothesis probability = 9.806430e-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:
Fri Jun 3 10:32:00 EDT 2011