batgrbproduct Analysis for Trigger=412217
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): Mon May 9 13:55:31 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger412217/SDC
======================================================================
Trigger: 00412217 Segment: 000
BAT Trigger Time: 287792873.74 [s; MET]
Trigger Stop: 287792873.804 [s; MET]
UTC: 2010-02-13T22:27:48.212320 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 349.428219015384 Dec: 43.3834539169845 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.01
Image Trigger?: NO
Rate S/N Ratio: 12.1655250605964 [ if not an image trigger ]
Image S/N Ratio: 7.01
Flight Position: [ source = BAT ]
RA: 349.428219015384 Dec: 43.3834539169845 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 349.373078326577 Dec: 43.3717413133688 [deg; J2000]
{ 23h 17m 29.5s , +43d 22' 18.3" }
+/- 1.37823989628657 [arcmin] (estimated 90% radius based on SNR)
+/- 0.38808840626106 [arcmin] (formal 1-sigma fit error)
SNR: 19.2345896958857
Angular difference between Flight and Ground position is 2.505302 arcmin
Partial Coding Fraction: 0.59375 [ including projection effects ]
Duration
T90: 2.21599996089935 +/- 0.257619864022535
Measured from: -0.164000034332275
to: 2.05199992656708 [s; relative to TRIGTIME]
T50: 1.17599993944168 +/- 0.782562479029981
Measured from: 0.23199999332428
to: 1.40799993276596 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.01199996471405
to: 2.01199996471405 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.392000019550323
to: 2.1599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.106463 0.138775 0.132181 0.030437
0.010907 0.011237 0.010723 0.008838 [error]
Peak 0.068757 0.094241 0.085321 0.010866
0.007161 0.007645 0.007401 0.005847 [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 2.98e-08 5.98e-08 9.34e-08 3.22e-07 2.60e-07 5.04e-07 erg/cm2
Error 4.38e-09 5.39e-09 1.01e-08 7.48e-08 2.49e-08 8.23e-08 erg/cm2
Peak flux Power-law 6.48e-01 6.87e-01 5.16e-01 6.30e-01 2.09e+00 2.48e+00 ph/cm2/s
Error 9.54e-02 6.42e-02 5.79e-02 1.42e-01 1.86e-01 2.28e-01 ph/cm2/s
Fluence Cutoff-PL 2.72e-08 6.27e-08 9.73e-08 1.63e-07 2.52e-07 3.51e-07 erg/cm2
Error 5.27e-09 6.43e-09 1.14e-08 1.33e-07 2.67e-08 1.15e-07 erg/cm2
Peak flux Cutoff-PL 5.65e-01 7.37e-01 5.52e-01 2.96e-01 2.04e+00 2.15e+00 ph/cm2/s
Error 1.15e-01 7.79e-02 6.81e-02 1.91e-01 2.65e-01 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 1.357 0.145 - - 1.05e-02 8.93e-04 74.210 57
CPL 0.860 0.587 119.8 -39.5 1.83e-02 1.30e-02 71.870 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 1.412 0.147 - - 1.71e-02 1.55e-03 68.870 57
CPL 0.658 0.652 90.2 83.4 4.09e-02 3.42e-02 64.220 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: 1.344000 sec.
T50 in the 50-300 keV band: 1.024000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.552 -0.392 2.160
T90 2.216 -0.164 2.052
T50 1.176 0.232 1.408
Peak 1.000 1.012 2.012
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
349.3731 +43.3717 0.0100 24.6 -91.9 0.4074 19.2 TRIG_00412217
------------------------------------------
Foreground time interval of the image:
-0.392 2.160 (delta_t = 2.552 [sec])
Background time interval of the image:
-239.740 -0.392 (delta_t = 239.348 [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 -0.392 sec. to 2.160 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35660 ( -0.144288 0.144954 )
Norm@50keV : 1.04577E-02 ( -0.000894444 0.000890902 )
------------------------------------------------------------
# Chi-Squared = 74.21 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.245525e-02
Photon flux (15-150 keV) in 2.552 sec: 1.26157 ( -0.107997 0.108109 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60271e-07 ( -2.48324e-08 2.50316e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.392 sec. to 2.160 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.859623 ( -0.630099 0.544537 )
Epeak [keV] : 119.752 ( -40.8048 -119.752 )
Norm@50keV : 1.82924E-02 ( -0.00813503 0.01786 )
------------------------------------------------------------
# Chi-Squared = 71.87 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 56 degrees of freedom
# Null hypothesis probability = 7.504709e-02
Photon flux (15-150 keV) in 2.552 sec: 1.23567 ( -0.112 0.11187 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.5225e-07 ( -2.67049e-08 2.67554e-08 ) ergs/cm2
Band function
Time interval is from -0.392 sec. to 2.160 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38054 ( -0.253778 0.6402 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 5.90540 ( )
Norm@50keV : 5.25896E-19 ( )
------------------------------------------------------------
# Chi-Squared = 119.87 using 59 PHA bins.
# Reduced chi-squared = 2.1794 for 55 degrees of freedom
# Null hypothesis probability = 1.009392e-06
Photon flux (15-150 keV) in 2.552 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 1.012 sec. to 2.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41175 ( -0.145787 0.147627 )
Norm@50keV : 1.71256E-02 ( -0.00155359 0.00154683 )
------------------------------------------------------------
# Chi-Squared = 68.87 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.347609e-01
Photon flux (15-150 keV) in 1 sec: 2.09120 ( -0.185596 0.185692 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65087e-07 ( -1.66683e-08 1.68166e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.012 sec. to 2.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.658205 ( -0.698607 0.605609 )
Epeak [keV] : 90.2498 ( -22.4103 144.396 )
Norm@50keV : 4.09028E-02 ( -0.0202195 0.0481583 )
------------------------------------------------------------
# Chi-Squared = 64.22 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 56 degrees of freedom
# Null hypothesis probability = 2.106233e-01
Photon flux (15-150 keV) in 1 sec: 2.03611 ( -0.19134 0.19109 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 1.012 sec. to 2.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.687536 ( -0.400516 0.53901 )
beta : -9.37154 ( 9.99992 19.9999 )
Epeak [keV] : 92.4950 ( -19.2321 132.74 )
Norm@50keV : 3.93817E-02 ( -0.0150741 0.0177871 )
------------------------------------------------------------
# Chi-Squared = 64.23 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 55 degrees of freedom
# Null hypothesis probability = 1.845479e-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 May 26 14:35:51 EDT 2011