batgrbproduct Analysis for Trigger=359951
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Fri Aug 14 09:47:02 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger359951/GCN5_download_cron
======================================================================
Trigger: 00359951 Segment: 000
BAT Trigger Time: 271903944 [s; MET]
Trigger Stop: 271904032 [s; MET]
UTC: 2009-08-14T00:52:19.004460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 239.610943588386 Dec: 25.5991346877481 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.01
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.01
Flight Position: [ source = BAT ]
RA: 239.610943588386 Dec: 25.5991346877481 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 239.613365218129 Dec: 25.5858329307728 [deg; J2000]
{ 15h 58m 27.2s , +25d 35' 09.0" }
+/- 2.02715637030108 [arcmin] (estimated 90% radius based on SNR)
+/- 1.06943838439753 [arcmin] (formal 1-sigma fit error)
SNR: 11.0842936337203
Angular difference between Flight and Ground position is 0.808792 arcmin
Partial Coding Fraction: 0.3789062 [ including projection effects ]
Duration
T90: 79.8720000386238 +/- 7.84532471063086
Measured from: -13.447999894619
to: 66.4240001440048 [s; relative to TRIGTIME]
T50: 44.688000023365 +/- 9.9002771678288
Measured from: -2.15199989080429
to: 42.5360001325607 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -12.6759999990463
to: -11.6759999990463 [s; relative to TRIGTIME]
Total Fluence
Measured from: -16.3759999871254
to: 73.6240000128746 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.775734 0.915988 0.527190 0.016695
0.079312 0.082243 0.072958 0.063594 [error]
Peak 0.014242 0.016252 0.031236 0.011853
0.008103 0.008771 0.008208 0.006895 [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 2.43e-07 3.69e-07 4.20e-07 9.12e-07 1.30e-06 1.94e-06 erg/cm2
Error 3.71e-08 3.82e-08 6.94e-08 3.02e-07 1.62e-07 3.73e-07 erg/cm2
Peak flux Power-law 8.06e-02 1.45e-01 2.01e-01 5.78e-01 5.78e-01 1.00e+00 ph/cm2/s
Error 7.36e-02 1.13e-01 6.02e-02 4.51e-01 1.96e-01 4.09e-01 ph/cm2/s
Fluence Cutoff-PL 2.24e-07 4.04e-07 4.18e-07 2.91e-07 1.34e-06 0.00e+00 erg/cm2
Error 4.25e-08 5.20e-08 7.86e-08 4.42e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 8.03e-02 1.45e-01 2.01e-01 5.74e-01 5.78e-01 1.00e+00 ph/cm2/s
Error 7.35e-02 1.13e-01 6.02e-02 4.49e-01 1.96e-01 4.07e-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 1.813 0.187 - - 1.58e-03 1.91e-04 43.910 57
CPL 0.995 0.825 54.1 148.2 4.48e-03 6.61e-03 40.980 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.532 0.704 - - 4.90e-03 1.98e-03 60.550 57
CPL 0.550 0.711 9999.4 0.0 4.98e-03 0.00e+00 60.560 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: 8.768000 sec.
T50 in the 50-300 keV band: 5.568000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 90.000 -16.376 73.624
T90 79.872 -13.448 66.424
T50 44.688 -2.152 42.536
Peak 1.000 -12.676 -11.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
239.6134 +25.5858 0.0173 30.2 73.4 1.9998 11.1 TRIG_00359951
------------------------------------------
Foreground time interval of the image:
-16.376 73.624 (delta_t = 90.000 [sec])
Background time interval of the image:
-239.000 -16.376 (delta_t = 222.624 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 -16.376 sec. to 73.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81344 ( -0.182849 0.190719 )
Norm@50keV : 1.57548E-03 ( -0.00019304 0.000189448 )
------------------------------------------------------------
# Chi-Squared = 43.91 using 59 PHA bins.
# Reduced chi-squared = 0.7704 for 57 degrees of freedom
# Null hypothesis probability = 8.981387e-01
Photon flux (15-150 keV) in 90 sec: 0.218239 ( -0.0226964 0.0227036 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30477e-06 ( -1.60494e-07 1.63458e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -16.376 sec. to 73.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.994704 ( -0.854648 0.796123 )
Epeak [keV] : 54.1208 ( -12.5528 283.889 )
Norm@50keV : 4.48326E-03 ( -0.00442854 0.00879511 )
------------------------------------------------------------
# Chi-Squared = 40.98 using 59 PHA bins.
# Reduced chi-squared = 0.7317 for 56 degrees of freedom
# Null hypothesis probability = 9.340233e-01
Photon flux (15-150 keV) in 90 sec: 0.212007 ( -0.023508 0.023496 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -16.376 sec. to 73.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20780 ( -0.446637 0.840183 )
beta : -9.37151 ( 9.99977 19.9998 )
Epeak [keV] : 58.3257 ( -16.7775 460.4 )
Norm@50keV : 3.40818E-03 ( -0.00341976 0.00134693 )
------------------------------------------------------------
# Chi-Squared = 41.07 using 59 PHA bins.
# Reduced chi-squared = 0.7466 for 55 degrees of freedom
# Null hypothesis probability = 9.186356e-01
Photon flux (15-150 keV) in 90 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -12.680 sec. to -11.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.532036 ( -0.793245 0.614722 )
Norm@50keV : 4.90464E-03 ( -0.00211405 0.00185111 )
------------------------------------------------------------
# Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.489388e-01
Photon flux (15-150 keV) in 1.008 sec: 0.577957 ( -0.1934 0.198641 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53596e-08 ( -1.99627e-08 1.99908e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.680 sec. to -11.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.550398 ( -0.825112 0.597306 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 4.98287E-03 ( )
------------------------------------------------------------
# Chi-Squared = 60.56 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 56 degrees of freedom
# Null hypothesis probability = 3.147542e-01
Photon flux (15-150 keV) in 1.008 sec: 0.577738 ( -0.193276 0.198543 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53906e-08 ( -1.99763e-08 2.00056e-08 ) ergs/cm2
Band function
Time interval is from -12.680 sec. to -11.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.795247 ( 0.795246 0.795246 )
beta : -0.532040 ( -0.614653 0.793323 )
Epeak [keV] : 13.8887 ( -13.8887 -13.8887 )
Norm@50keV : 7.51047E-03 ( 13.1599 -0.00751026 )
------------------------------------------------------------
# Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.101 for 55 degrees of freedom
# Null hypothesis probability = 2.824292e-01
Photon flux (15-150 keV) in 1.008 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Aug 14 10:12:52 EDT 2009