batgrbproduct Analysis for Trigger=352516
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 v2.44
Process Start Time (local time): Tue May 19 13:57:15 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger352516/SDC
======================================================================
Trigger: 00352516 Segment: 000
BAT Trigger Time: 264348890.688 [s; MET]
Trigger Stop: 264348891.712 [s; MET]
UTC: 2009-05-18T14:14:45.936220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 49.9709299542173 Dec: -56.3217298469194 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.48
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 6.48
Flight Position: [ source = BAT ]
RA: 49.9709299542173 Dec: -56.3217298469194 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 49.9477323536072 Dec: -56.2983606832343 [deg; J2000]
{ 03h 19m 47.5s , -56d 17' 54.1" }
+/- 3.41708373014003 [arcmin] (estimated 90% radius based on SNR)
+/- 1.86175553503301 [arcmin] (formal 1-sigma fit error)
SNR: 5.25718436562999
Angular difference between Flight and Ground position is 1.600657 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 3.45600003004074 +/- 0.692265842640822
Measured from: -2.38400000333786
to: 1.07200002670288 [s; relative to TRIGTIME]
T50: 2.36800003051758 +/- 1.45098035223059
Measured from: -2
to: 0.368000030517578 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -2.62799999117851
to: -1.62799999117851 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.57600000500679
to: 1.26399999856949 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000670 0.030111 0.052299 0.056778
0.011286 0.011879 0.011640 0.012508 [error]
Peak 0.004745 0.014097 0.011860 0.017753
0.005473 0.005750 0.005581 0.006099 [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 2.17e-09 9.42e-09 3.47e-08 4.54e-07 1.01e-07 5.01e-07 erg/cm2
Error 2.46e-09 5.71e-09 2.27e-08 4.25e-07 3.14e-08 4.21e-07 erg/cm2
Peak flux Power-law 7.90e-02 1.00e-01 9.22e-02 1.49e-01 3.22e-01 4.20e-01 ph/cm2/s
Error 7.29e-02 7.64e-02 7.14e-02 2.48e-01 1.50e-01 2.44e-01 ph/cm2/s
Fluence Cutoff-PL 2.06e-09 9.47e-09 3.50e-08 4.18e-07 1.01e-07 3.87e-07 erg/cm2
Error 2.46e-09 5.70e-09 1.34e-08 5.18e-07 3.35e-08 3.87e-07 erg/cm2
Peak flux Cutoff-PL 7.93e-02 1.00e-01 9.22e-02 1.48e-01 3.24e-01 4.16e-01 ph/cm2/s
Error 7.28e-02 5.90e-02 5.27e-02 2.42e-01 1.48e-01 3.46e-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 0.119 0.757 - - 1.58e-03 1.14e-03 59.420 57
CPL 0.105 2.189 9989.0 0.0 1.60e-03 2.53e-02 59.420 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 1.116 1.058 - - 2.77e-03 1.27e-03 64.100 57
CPL 4.333 0.000 492.0 0.0 6.12e-05 0.00e+00 64.040 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: 3.200000 sec.
T50 in the 50-300 keV band: 2.048000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 3.840 -2.576 1.264
T90 3.456 -2.384 1.072
T50 2.368 -2.000 0.368
Peak 1.000 -2.628 -1.628
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
49.9477 -56.2984 0.0365 19.4 -140.2 0.1330 5.3 TRIG_00352516
------------------------------------------
Foreground time interval of the image:
-2.576 1.264 (delta_t = 3.840 [sec])
Background time interval of the image:
-60.688 -2.576 (delta_t = 58.112 [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 -2.576 sec. to 1.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.119398 ( -0.884831 0.629214 )
Norm@50keV : 1.58098E-03 ( -0.00158098 0.000696761 )
------------------------------------------------------------
# Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.873705e-01
Photon flux (15-150 keV) in 3.84 sec: 0.205097 ( -0.0667509 0.0683718 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00709e-07 ( -3.13458e-08 3.15117e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.576 sec. to 1.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.104650 ( -4.22262 0.155644 )
Epeak [keV] : 9988.95 ( )
Norm@50keV : 1.59699E-03 ( -0.000756967 0.0497662 )
------------------------------------------------------------
# Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 56 degrees of freedom
# Null hypothesis probability = 3.520170e-01
Photon flux (15-150 keV) in 3.84 sec: 0.204905 ( -0.066413 0.068433 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00643e-07 ( -3.52516e-08 3.16769e-08 ) ergs/cm2
Band function
Time interval is from -2.576 sec. to 1.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.635448 ( 0.634462 0.634462 )
beta : -0.119394 ( -0.629766 0.886413 )
Epeak [keV] : 15.8474 ( -15.851 -15.851 )
Norm@50keV : 2.41330E-03 ( -0.00241381 9671.21 )
------------------------------------------------------------
# Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 55 degrees of freedom
# Null hypothesis probability = 3.176689e-01
Photon flux (15-150 keV) in 3.84 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 -2.576 sec. to -1.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11629 ( -1.13733 0.978433 )
Norm@50keV : 2.77001E-03 ( -0.00127392 0.00127157 )
------------------------------------------------------------
# Chi-Squared = 64.10 using 59 PHA bins.
# Reduced chi-squared = 1.125 for 57 degrees of freedom
# Null hypothesis probability = 2.416921e-01
Photon flux (15-150 keV) in 0.896 sec: 0.321825 ( -0.149283 0.149859 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58155e-08 ( -1.35388e-08 1.45601e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.576 sec. to -1.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.33270 ( )
Epeak [keV] : 491.969 ( )
Norm@50keV : 6.11931E-05 ( )
------------------------------------------------------------
# Chi-Squared = 64.04 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 56 degrees of freedom
# Null hypothesis probability = 2.152098e-01
Photon flux (15-150 keV) in 0.896 sec: 0.324496 ( -0.15034 0.145238 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57387e-08 ( -1.44745e-08 1.45704e-08 ) ergs/cm2
Band function
Time interval is from -2.576 sec. to -1.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.921792 ( 0.921726 0.921726 )
beta : -1.11630 ( 1.11621 1.1371 )
Epeak [keV] : 50.7595 ( -50.942 -50.942 )
Norm@50keV : 4.68112E-03 ( -0.00467908 0.544636 )
------------------------------------------------------------
# Chi-Squared = 64.10 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.876683e-01
Photon flux (15-150 keV) in 0.896 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:
Wed Jun 1 16:48:35 EDT 2011