batgrbproduct Analysis for Trigger=239987
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 2 13:14:23 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger239987/GCN5_download_cron
======================================================================
Trigger: 00239987 Segment: 000
BAT Trigger Time: 185878698.56 [s; MET]
Trigger Stop: 185878699.584 [s; MET]
UTC: 2006-11-22T08:58:16.973240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 189.10936752306 Dec: -12.2345009942656 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.61
Image Trigger?: NO
Rate S/N Ratio: 15.4919333848297 [ if not an image trigger ]
Image S/N Ratio: 6.61
Flight Position: [ source = BAT ]
RA: 189.10936752306 Dec: -12.2345009942656 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.002948236211 Dec: -12.2468792992675 [deg; J2000]
{ 12h 36m 00.7s , -12d 14' 48.8" }
+/- 4.25298667727842 [arcmin] (estimated 90% radius based on SNR)
+/- 2.4248152715699 [arcmin] (formal 1-sigma fit error)
SNR: 3.84577668737004
RA = 12h 36m 0.7s (189.002948 deg.)
Dec = -12d 14' 49" (-12.246879 deg.)
Angular difference between Flight and Ground position is 6.284038 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001055 0.004454 0.011450 0.021133
0.005287 0.005619 0.005275 0.005888 [error]
Peak 0.001055 0.004454 0.011450 0.021133
0.005287 0.005619 0.005275 0.005888 [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 2.16e-10 1.40e-09 2.37e-09 3.86e-07 1.29e-08 1.98e-07 erg/cm2
Error 8.49e-10 6.49e-09 3.35e-07 1.97e-08 3.28e-07 0.00e+00 erg/cm2
Peak flux Power-law 6.61e-03 2.26e-02 1.80e-02 8.81e-01 6.97e-02 6.41e-01 ph/cm2/s
Error 2.64e-02 5.29e-02 7.78e-01 1.45e-01 7.26e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 5.74e-12 1.14e-10 2.10e-09 4.26e-07 1.22e-08 2.20e-07 erg/cm2
Error 7.51e-10 2.18e-09 6.47e-09 3.74e-07 1.72e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.06e-04 1.69e-03 1.59e-02 9.61e-01 6.52e-02 6.37e-01 ph/cm2/s
Error 3.64e-02 5.28e-02 8.59e-01 1.44e-01 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 2.18e-10 1.42e-09 2.15e-09 4.27e-07 1.24e-08 1.27e-07 erg/cm2
Error 8.40e-10 6.51e-09 1.03e-06 1.97e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.29e-06 9.01e-05 3.15e-03 1.87e+00 2.43e-02 6.34e-01 ph/cm2/s
Error 2.09e-02 3.40e-02 5.24e-02 1.50e+00 1.36e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.523 0.000 - - 1.03e-03 1.22e-03 49.575 57
CPL -0.505 0.000 9999.4 5000.0 1.07e-03 1.22e-03 49.586 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.523 0.000 - - 1.03e-03 1.22e-03 49.575 57
CPL -0.505 0.000 9999.4 5000.0 1.07e-03 1.22e-03 49.586 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
189.0029 -12.2469 0.0499 18.2 -167.7 0.0452 3.8 TRIG_00239987
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-38.459 -10.560 (delta_t = 27.899 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.522592 ( )
Norm@50keV : 1.033380E-03 ( -9.812553E-05 2.342435E-03) )
------------------------------------------------------------
Chi-Squared = 49.57515 using 59 PHA bins.
Reduced chi-squared = 0.8697394 for 57 degrees of freedom
Null hypothesis probability = 0.747
Photon flux (15-150 keV) in 1.024 sec: 6.971191E-02 ( -0.0697119 0.220016 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29055e-08 ( -1.29055e-08 2.65431e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.505451 ( )
Epeak [keV] : 9999.35 ( -9999.34 0.650391 )
Norm@50keV : 1.070406E-03 ( -1.003014E-04 2.346201E-03) )
------------------------------------------------------------
Chi-Squared = 49.58578 using 59 PHA bins.
Reduced chi-squared = 0.8854604 for 56 degrees of freedom
Null hypothesis probability = 0.715
Photon flux (15-150 keV) in 1.024 sec: 6.518904E-02 ( -0.065189 0.223266 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22444e-08 ( -7.34339e-09 2.71315e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.238056 ( -10.2381 4.76194 )
beta : 0.451644 ( -1.48664 9.54836 )
Epeak [keV] : 19.1167 ( -19.0167 9980.88 )
Norm@50keV : 1.908265E-03 ( -1.908265E-03 69861.2 )
------------------------------------------------------------
Chi-Squared = 49.57703 using 59 PHA bins.
Reduced chi-squared = 0.9014006 for 55 degrees of freedom
Null hypothesis probability = 0.681
Photon flux (15-150 keV) in 1.024 sec: 2.432879E-02 ( -0.0199256 0.252581 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2419e-08 ( -1.2419e-08 2.69007e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.522592 ( )
Norm@50keV : 1.033380E-03 ( -9.812553E-05 2.342435E-03) )
------------------------------------------------------------
Chi-Squared = 49.57515 using 59 PHA bins.
Reduced chi-squared = 0.8697394 for 57 degrees of freedom
Null hypothesis probability = 0.747
Photon flux (15-150 keV) in 1.024 sec: 6.971191E-02 ( -0.0697119 0.220016 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29055e-08 ( -1.29055e-08 2.65431e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.505451 ( )
Epeak [keV] : 9999.35 ( -9999.34 0.650391 )
Norm@50keV : 1.070406E-03 ( -1.003014E-04 2.346201E-03) )
------------------------------------------------------------
Chi-Squared = 49.58578 using 59 PHA bins.
Reduced chi-squared = 0.8854604 for 56 degrees of freedom
Null hypothesis probability = 0.715
Photon flux (15-150 keV) in 1.024 sec: 6.518904E-02 ( -0.065189 0.223266 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22444e-08 ( -7.34339e-09 2.71315e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.238056 ( -10.2381 4.76194 )
beta : 0.451644 ( -1.48664 9.54836 )
Epeak [keV] : 19.1167 ( -19.0167 9980.88 )
Norm@50keV : 1.908265E-03 ( -1.908265E-03 69861.2 )
------------------------------------------------------------
Chi-Squared = 49.57703 using 59 PHA bins.
Reduced chi-squared = 0.9014006 for 55 degrees of freedom
Null hypothesis probability = 0.681
Photon flux (15-150 keV) in 1.024 sec: 2.432879E-02 ( -0.0199256 0.252581 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2419e-08 ( -1.2419e-08 2.69007e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 13:31:00 EST 2008