batgrbproduct Analysis for Trigger=158539
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): Wed Jan 9 15:10:31 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger158539/GCN5_download_cron
======================================================================
Trigger: 00158539 Segment: 000
BAT Trigger Time: 150299560 [s; MET]
Trigger Stop: 150299624 [s; MET]
UTC: 2005-10-06T13:52:40.232060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 116.964241614475 Dec: -67.7152528042818 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33329
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33329
Flight Position: [ source = BAT ]
RA: 116.964241614475 Dec: -67.7152528042818 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 116.983108668679 Dec: -67.9029553354419 [deg; J2000]
{ 07h 47m 55.9s , -67d 54' 10.6" }
+/- 5.35356973038254 [arcmin] (estimated 90% radius based on SNR)
+/- 2.70090901666852 [arcmin] (formal 1-sigma fit error)
SNR: 2.76821071955508
RA = 7h 47m 55.9s (116.983109 deg.)
Dec = -67d 54' 11" (-67.902955 deg.)
Angular difference between Flight and Ground position is 11.270265 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.060801 0.047828 -0.036480 -0.020705
0.025160 0.025339 0.021701 0.018869 [error]
Peak 0.060801 0.047828 -0.036480 -0.020705
0.025160 0.025339 0.021701 0.018869 [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 1.29e-08 1.01e-08 5.34e-09 4.09e-09 3.03e-08 3.19e-08 erg/cm2
Error 9.96e-09 1.09e-08 8.64e-09 1.65e-08 3.12e-08 3.97e-08 erg/cm2
Peak flux Power-law 1.35e-02 5.93e-03 1.56e-03 5.09e-04 2.12e-02 2.15e-02 ph/cm2/s
Error 1.03e-02 5.85e-03 2.47e-03 1.81e-03 1.64e-02 1.69e-02 ph/cm2/s
Fluence Cutoff-PL 1.71e-08 1.65e-08 1.11e-09 7.49e-13 3.50e-08 3.44e-08 erg/cm2
Error 1.08e-08 1.41e-08 4.90e-09 8.43e-10 2.19e-08 2.10e-08 erg/cm2
Peak flux Cutoff-PL 1.73e-02 9.91e-03 3.69e-04 1.26e-07 2.76e-02 2.75e-02 ph/cm2/s
Error 1.10e-02 6.74e-03 1.51e-03 1.32e-04 1.60e-02 1.60e-02 ph/cm2/s
Fluence Band 1.36e-08 1.73e-08 4.43e-09 1.14e-10 3.61e-08 2.86e-08 erg/cm2
Error 9.48e-09 1.21e-08 2.07e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.59e-02 1.04e-02 2.65e-04 8.16e-07 2.80e-02 2.73e-02 ph/cm2/s
Error 9.88e-03 2.78e-04 8.19e-07 1.58e-02 1.61e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.910 4.075 - - 8.26e-05 1.03e-04 63.717 57
CPL -2.497 0.000 23.9 9.5 8.11e-01 5.99e+00 60.387 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.910 4.075 - - 8.26e-05 1.03e-04 63.717 57
CPL -2.497 0.000 23.9 9.5 8.11e-01 5.99e+00 60.387 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
116.9831 -67.9030 0.0694 8.8 178.8 0.1487 2.8 TRIG_00158539
------------------------------------------
Foreground time interval of the image:
0.000 24.880 (delta_t = 24.880 [sec])
26.000 33.063 (delta_t = 7.063 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 24.880200
26.000000 33.062800
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.91007 ( -5.91007 2.23972 )
Norm@50keV : 8.258962E-05 ( -8.258961E-05 1.238055E-04) )
------------------------------------------------------------
Chi-Squared = 63.71716 using 59 PHA bins.
Reduced chi-squared = 1.117845 for 57 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 31.94 sec: 2.124966E-02 ( -0.0163288 0.0164628 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.028e-08 ( -3.028e-08 3.22188e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 24.880200
26.000000 33.062800
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49733 ( )
Epeak [keV] : 23.9340 ( -8.18072 10.7244 )
Norm@50keV : 0.811107 ( -1.51885 10.4663 )
------------------------------------------------------------
Chi-Squared = 60.38651 using 59 PHA bins.
Reduced chi-squared = 1.078331 for 56 degrees of freedom
Null hypothesis probability = 0.320
Photon flux (15-150 keV) in 31.94 sec: 2.760716E-02 ( -0.0159494 0.0159782 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49989e-08 ( -2.08533e-08 2.29786e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 24.880200
26.000000 33.062800
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51826 ( -5.89890 3.584480E-02) )
beta : -9.34693 ( -0.628329 19.3717 )
Epeak [keV] : 10.7950 ( -5.81596 9976.50 )
Norm@50keV : 8.498339E-04 ( -46.1666 334.652 )
------------------------------------------------------------
Chi-Squared = 62.38157 using 59 PHA bins.
Reduced chi-squared = 1.134210 for 55 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 31.94 sec: 2.797854E-02 ( -0.0159074 0.0157527 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61213e-08 ( -2.07383e-08 2.0631e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 26.000 sec. to 33.063 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.91007 ( -5.91007 2.23972 )
Norm@50keV : 8.258962E-05 ( -8.258961E-05 1.238055E-04) )
------------------------------------------------------------
Chi-Squared = 63.71716 using 59 PHA bins.
Reduced chi-squared = 1.117845 for 57 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 31.94 sec: 2.124966E-02 ( -0.0163288 0.0164628 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.028e-08 ( -3.028e-08 3.22188e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.000 sec. to 33.063 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49733 ( )
Epeak [keV] : 23.9340 ( -8.18072 10.7244 )
Norm@50keV : 0.811107 ( -1.51885 10.4663 )
------------------------------------------------------------
Chi-Squared = 60.38651 using 59 PHA bins.
Reduced chi-squared = 1.078331 for 56 degrees of freedom
Null hypothesis probability = 0.320
Photon flux (15-150 keV) in 31.94 sec: 2.760716E-02 ( -0.0159494 0.0159782 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49989e-08 ( -2.08533e-08 2.29786e-08 ) ergs/cm2
Band function
Time interval is from 26.000 sec. to 33.063 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51826 ( -5.89890 3.584480E-02) )
beta : -9.34693 ( -0.628329 19.3717 )
Epeak [keV] : 10.7950 ( -5.80427 9976.50 )
Norm@50keV : 8.498339E-04 ( -46.1666 334.652 )
------------------------------------------------------------
Chi-Squared = 62.38157 using 59 PHA bins.
Reduced chi-squared = 1.134210 for 55 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 31.94 sec: 2.797854E-02 ( -0.0159074 0.0157527 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.61213e-08 ( -2.07383e-08 2.0631e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 15:16:20 EST 2008