batgrbproduct Analysis for Trigger=352648
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 v2.45
Process Start Time (local time): Tue Aug 11 07:25:57 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/352648
======================================================================
Trigger: 00352648 Segment: 000
BAT Trigger Time: 264460141.184 [s; MET]
Trigger Stop: 264460153.344 [s; MET]
UTC: 2009-05-19T21:08:56.428660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 142.292608313677 Dec: 0.182991992937532 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.61
Image Trigger?: NO
Rate S/N Ratio: 13.6747943311773 [ if not an image trigger ]
Image S/N Ratio: 8.61
Flight Position: [ source = BAT ]
RA: 142.292608313677 Dec: 0.182991992937532 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 142.307741745107 Dec: 0.185121201407301 [deg; J2000]
{ 09h 29m 13.9s , +00d 11' 06.4" }
+/- 1.96424250322778 [arcmin] (estimated 90% radius based on SNR)
+/- 0.772913272729652 [arcmin] (formal 1-sigma fit error)
SNR: 11.5949326676686
Angular difference between Flight and Ground position is 0.916944 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 58.2600000202656 +/- 8.24011648989424
Measured from: -10.8599999845028
to: 47.4000000357628 [s; relative to TRIGTIME]
T50: 26.1000000238419 +/- 13.4232329990453
Measured from: -4.23199999332428
to: 21.8680000305176 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -10.4039999842644
to: -9.40399998426437 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.3999999761581
to: 54.1760000288486 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.295454 0.514920 0.566485 0.227335
0.055395 0.057126 0.051723 0.046448 [error]
Peak 0.010710 0.017326 0.034327 0.014305
0.006742 0.007244 0.006732 0.006399 [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 7.23e-08 1.98e-07 4.39e-07 2.57e-06 1.18e-06 3.28e-06 erg/cm2
Error 1.81e-08 2.87e-08 4.82e-08 7.14e-07 1.31e-07 7.27e-07 erg/cm2
Peak flux Power-law 6.19e-02 1.28e-01 2.06e-01 7.42e-01 5.70e-01 1.14e+00 ph/cm2/s
Error 5.40e-02 9.77e-02 5.20e-02 5.09e-01 1.58e-01 4.56e-01 ph/cm2/s
Fluence Cutoff-PL 7.24e-08 1.98e-07 4.39e-07 2.55e-06 1.19e-06 3.29e-06 erg/cm2
Error 1.40e-08 2.88e-08 4.81e-08 9.76e-07 1.31e-07 9.79e-07 erg/cm2
Peak flux Cutoff-PL 6.19e-02 1.28e-01 2.06e-01 7.37e-01 5.66e-01 1.15e+00 ph/cm2/s
Error 5.54e-02 6.66e-02 5.26e-02 6.94e-01 1.57e-01 4.41e-01 ph/cm2/s
Fluence Band 7.13e-08 1.98e-07 4.39e-07 2.55e-06 1.18e-06 3.27e-06 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 6.17e-02 1.28e-01 2.06e-01 7.38e-01 5.69e-01 1.13e+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 0.853 0.203 - - 1.55e-03 1.73e-04 64.690 57
CPL 0.846 0.251 9996.7 0.0 1.56e-03 5.69e-04 64.720 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 0.312 0.639 - - 4.63e-03 1.73e-03 46.560 57
CPL 0.300 0.647 10000.0 0.0 4.68e-03 1.74e-03 46.580 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: 52.800000 sec.
T50 in the 50-300 keV band: 22.400000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 66.576 -12.400 54.176
T90 58.260 -10.860 47.400
T50 26.100 -4.232 21.868
Peak 1.000 -10.404 -9.404
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
142.3077 +0.1851 0.0165 22.4 75.1 1.6797 11.6 TRIG_00352648
------------------------------------------
Foreground time interval of the image:
-12.400 54.176 (delta_t = 66.576 [sec])
Background time interval of the image:
-100.683 -12.400 (delta_t = 88.283 [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 -12.400 sec. to 54.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.852788 ( -0.208891 0.198033 )
Norm@50keV : 1.55436E-03 ( -0.000174159 0.00017114 )
------------------------------------------------------------
# Chi-Squared = 64.69 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.259367e-01
Photon flux (15-150 keV) in 66.58 sec: 0.178423 ( -0.019579 0.0196654 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18334e-06 ( -1.30681e-07 1.31517e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.400 sec. to 54.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.845942 ( -0.228935 0.272323 )
Epeak [keV] : 9996.69 ( )
Norm@50keV : 1.56490E-03 ( -0.000162512 0.000975542 )
------------------------------------------------------------
# Chi-Squared = 64.72 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 56 degrees of freedom
# Null hypothesis probability = 1.986044e-01
Photon flux (15-150 keV) in 66.58 sec: 0.178299 ( -0.019467 0.019771 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18602e-06 ( -1.32794e-07 1.29059e-07 ) ergs/cm2
Band function
Time interval is from -12.400 sec. to 54.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -158835 -158835 )
beta : -0.886067 ( -0.280037 0.212755 )
Epeak [keV] : 26.0846 ( -19.9738 17.0738 )
Norm@50keV : 72.4195 ( -70.1124 232300 )
------------------------------------------------------------
# Chi-Squared = 64.19 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 55 degrees of freedom
# Null hypothesis probability = 1.854387e-01
Photon flux (15-150 keV) in 66.58 sec: 0.177992 ( -0.020612 0.019036 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18275e-06 ( -1.30583e-07 1.31316e-07 ) 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 -10.404 sec. to -9.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.311734 ( -0.716701 0.561384 )
Norm@50keV : 4.63157E-03 ( -0.00184071 0.00161883 )
------------------------------------------------------------
# Chi-Squared = 46.56 using 59 PHA bins.
# Reduced chi-squared = 0.8168 for 57 degrees of freedom
# Null hypothesis probability = 8.367981e-01
Photon flux (15-150 keV) in 1 sec: 0.569778 ( -0.155798 0.160307 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87706e-08 ( -1.74175e-08 1.74307e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.404 sec. to -9.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.299747 ( -0.763518 0.530573 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 4.67528E-03 ( -0.00184905 0.00162475 )
------------------------------------------------------------
# Chi-Squared = 46.58 using 59 PHA bins.
# Reduced chi-squared = 0.8317 for 56 degrees of freedom
# Null hypothesis probability = 8.111310e-01
Photon flux (15-150 keV) in 1 sec: 0.565830 ( -0.149471 0.164054 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87837e-08 ( -1.73739e-08 1.73518e-08 ) ergs/cm2
Band function
Time interval is from -10.404 sec. to -9.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.99997 ( 171662 171662 )
beta : -0.311700 ( -0.561595 0.716606 )
Epeak [keV] : 26.0303 ( -26.0303 -26.0303 )
Norm@50keV : 0.629486 ( -0.250177 0.220022 )
------------------------------------------------------------
# Chi-Squared = 46.56 using 59 PHA bins.
# Reduced chi-squared = 0.8465 for 55 degrees of freedom
# Null hypothesis probability = 7.839525e-01
Photon flux (15-150 keV) in 1 sec: 0.569491 ( -0.156575 0.160261 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.87656e-08 ( -1.74085e-08 1.74284e-08 ) 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 May 27 11:16:11 EDT 2011