batgrbproduct Analysis for Trigger=288590
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 v2.41
Process Start Time (local time): Fri Dec 14 10:46:25 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger288590/GCN5_download_cron
======================================================================
Trigger: 00288590 Segment: 000
BAT Trigger Time: 210629016 [s; MET]
Trigger Stop: 210629080 [s; MET]
UTC: 2007-09-04T20:03:33.798220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 80.4514603009905 Dec: 22.4631092780922 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13
Flight Position: [ source = BAT ]
RA: 80.4514603009905 Dec: 22.4631092780922 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 80.302252219706 Dec: 22.5082352733686 [deg; J2000]
{ 05h 21m 12.5s , +22d 30' 29.6" }
+/- 2.35976709972814 [arcmin] (estimated 90% radius based on SNR)
+/- 2.30270202818698 [arcmin] (formal 1-sigma fit error)
SNR: 8.92171154016356
RA = 5h 21m 12.5s (80.302252 deg.)
Dec = 22d 30' 30" (22.508235 deg.)
Angular difference between Flight and Ground position is 8.703722 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 56.9600000083447 +/- 7.51382858605206
Measured from: -37.027999997139
to: 19.9320000112057 [s; relative to TRIGTIME]
T50: 26.9320000112057 +/- 9.01728116201891
Measured from: -19.1520000100136
to: 7.78000000119209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -6.50400000810623
to: -5.50400000810623 [s; relative to TRIGTIME]
Total Fluence
Measured from: -41.4079999923706
to: 23.7840000092983 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.520310 0.458565 0.205216 0.067072
0.070488 0.070757 0.063541 0.058086 [error]
Peak 0.014915 0.029734 0.015491 0.000070
0.008821 0.008745 0.007951 0.007203 [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 1.87e-07 2.30e-07 2.05e-07 3.17e-07 7.32e-07 9.40e-07 erg/cm2
Error 4.41e-08 3.79e-08 6.38e-08 1.98e-07 1.43e-07 2.68e-07 erg/cm2
Peak flux Power-law 2.41e-01 1.98e-01 1.10e-01 8.99e-02 5.88e-01 6.38e-01 ph/cm2/s
Error 1.47e-01 8.15e-02 6.39e-02 1.06e-01 2.43e-01 2.60e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 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
Fluence Band 1.80e-07 9.78e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 1.58e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.13e-01 2.17e-01 1.16e-01 3.84e-02 5.73e-01 5.84e-01 ph/cm2/s
Error 1.68e-01 1.03e-01 9.76e-02 1.10e-01 2.48e-01 2.72e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.165 0.346 - - 1.20e-03 2.67e-04 49.805 57
CPL 1.972 0.000 8.6 0.0 1.47e-03 0.00e+00 50.214 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.847 0.771 - - 4.19e-03 1.95e-03 56.929 57
CPL 0.990 0.000 55.7 0.0 1.20e-02 0.00e+00 56.635 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 65.192 -41.408 23.784
T90 56.960 -37.028 19.932
T50 26.932 -19.152 7.780
Peak 1.000 -6.504 -5.504
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
80.3023 +22.5082 0.0217 46.4 -12.9 2.5603 8.9 TRIG_00288590
------------------------------------------
Foreground time interval of the image:
-41.408 23.784 (delta_t = 65.192 [sec])
Background time interval of the image:
-60.000 -41.408 (delta_t = 18.592 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -41.408 sec. to 23.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16457 ( -0.327236 0.365734 )
Norm@50keV : 1.199943E-03 ( -2.744962E-04 2.596084E-04) )
------------------------------------------------------------
Chi-Squared = 49.80541 using 59 PHA bins.
Reduced chi-squared = 0.8737792 for 57 degrees of freedom
Null hypothesis probability = 0.739
Photon flux (15-150 keV) in 65.19 sec: 0.195075 ( -0.031824 0.031872 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.32227e-07 ( -1.40791e-07 1.44565e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -41.408 sec. to 23.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97196 ( )
Epeak [keV] : 8.63689 ( )
Norm@50keV : 1.470220E-03 ( )
------------------------------------------------------------
Chi-Squared = 50.21356 using 59 PHA bins.
Reduced chi-squared = 0.8966708 for 56 degrees of freedom
Null hypothesis probability = 0.693
Photon flux (15-150 keV) in 65.19 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -41.408 sec. to 23.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55441 ( -7.80559 7.19441 )
beta : -2.14275 ( -0.365483 0.327263 )
Epeak [keV] : 11.0008 ( -10.9008 9989.00 )
Norm@50keV : 4.535786E-03 ( -3.735790E-02 3.525674E-02) )
------------------------------------------------------------
Chi-Squared = 49.82050 using 59 PHA bins.
Reduced chi-squared = 0.9058272 for 55 degrees of freedom
Null hypothesis probability = 0.672
Photon flux (15-150 keV) in 65.19 sec: 0.194847 ( -0.031486 0.031805 ) 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 -6.504 sec. to -5.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84690 ( -0.706774 0.835316 )
Norm@50keV : 4.189530E-03 ( -2.017733E-03 1.877814E-03) )
------------------------------------------------------------
Chi-Squared = 56.92862 using 59 PHA bins.
Reduced chi-squared = 0.9987476 for 57 degrees of freedom
Null hypothesis probability = 0.478
Photon flux (15-150 keV) in 1.000 sec: 0.588154 ( -0.242792 0.243862 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85021e-08 ( -1.72933e-08 1.8097e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.504 sec. to -5.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.990327 ( )
Epeak [keV] : 55.7060 ( )
Norm@50keV : 1.197157E-02 ( )
------------------------------------------------------------
Chi-Squared = 56.63523 using 59 PHA bins.
Reduced chi-squared = 1.011343 for 56 degrees of freedom
Null hypothesis probability = 0.451
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -6.504 sec. to -5.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.992906 ( -4.86961 4.01106 )
beta : -8.80979 ( -1.19021 7.62641 )
Epeak [keV] : 55.6948 ( -55.5948 9944.31 )
Norm@50keV : 1.193796E-02 ( -1.193796E-02 134.505 )
------------------------------------------------------------
Chi-Squared = 56.63524 using 59 PHA bins.
Reduced chi-squared = 1.029732 for 55 degrees of freedom
Null hypothesis probability = 0.414
Photon flux (15-150 keV) in 1.000 sec: 0.573015 ( -0.247485 0.248365 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67809e-08 ( -1.69077e-08 1.88383e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 10:52:27 EST 2007