batgrbproduct Analysis for Trigger=208183
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): Mon Dec 31 21:43:52 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger208183/GCN5_download_cron
======================================================================
Trigger: 00208183 Segment: 000
BAT Trigger Time: 168240776.608 [s; MET]
Trigger Stop: 168240776.992 [s; MET]
UTC: 2006-05-02T05:32:55.440100 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 135.900344538918 Dec: -18.1089959986378 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.85
Image Trigger?: NO
Rate S/N Ratio: 8.06225774829855 [ if not an image trigger ]
Image S/N Ratio: 6.85
Flight Position: [ source = BAT ]
RA: 135.900344538918 Dec: -18.1089959986378 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 136.028056993898 Dec: -18.0270673873226 [deg; J2000]
{ 09h 04m 06.7s , -18d 01' 37.4" }
+/- 6.37171765969446 [arcmin] (estimated 90% radius based on SNR)
+/- 4.23995083329064 [arcmin] (formal 1-sigma fit error)
SNR: 2.15864133791382
RA = 9h 4m 6.7s (136.028057 deg.)
Dec = -18d 1' 37" (-18.027067 deg.)
Angular difference between Flight and Ground position is 8.788280 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000105 0.000223 0.005705 0.003115
0.003052 0.003038 0.002559 0.002323 [error]
Peak 0.000105 0.000223 0.005705 0.003115
0.003052 0.003038 0.002559 0.002323 [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 3.10e-10 8.44e-10 1.83e-09 1.04e-08 4.95e-09 1.35e-08 erg/cm2
Error 6.37e-10 1.07e-09 1.85e-09 2.97e-08 5.01e-09 2.99e-08 erg/cm2
Peak flux Power-law 2.54e-02 3.82e-02 4.11e-02 8.35e-02 1.31e-01 1.89e-01 ph/cm2/s
Error 5.39e-02 4.92e-02 4.15e-02 1.81e-01 1.50e-01 1.90e-01 ph/cm2/s
Fluence Cutoff-PL 9.00e-11 8.68e-10 3.27e-09 3.02e-09 6.32e-09 7.41e-09 erg/cm2
Error 4.39e-10 1.13e-09 2.68e-09 1.33e-08 5.06e-09 1.45e-08 erg/cm2
Peak flux Cutoff-PL 7.08e-03 3.65e-02 7.31e-02 3.68e-02 1.45e-01 1.53e-01 ph/cm2/s
Error 3.69e-02 4.98e-02 6.71e-02 9.63e-02 1.37e-01 1.17e-01 ph/cm2/s
Fluence Band 2.91e-11 6.26e-10 3.63e-09 2.75e-09 6.54e-09 7.16e-09 erg/cm2
Error 2.28e-10 7.53e-10 3.23e-09 2.41e-09 4.95e-09 1.15e-08 erg/cm2
Peak flux Band 2.43e-03 2.65e-02 8.16e-02 3.52e-02 1.40e-01 1.42e-01 ph/cm2/s
Error 1.62e-02 4.40e-02 8.33e-02 6.56e-02 1.27e-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 0.881 6.500 - - 1.14e-03 1.25e-03 59.247 57
CPL 0.872 6.500 9999.1 5000.0 1.15e-03 1.26e-03 59.242 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.881 6.500 - - 1.14e-03 1.25e-03 59.247 57
CPL 0.872 6.500 9999.1 5000.0 1.15e-03 1.26e-03 59.242 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 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
136.0281 -18.0271 0.0890 22.0 23.3 0.0123 2.2 TRIG_00208183
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-239.640 -8.640 (delta_t = 231.000 [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 -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.880537 ( -3.88054 9.11946 )
Norm@50keV : 1.136623E-03 ( -1.136623E-03 1.370124E-03) )
------------------------------------------------------------
Chi-Squared = 59.24745 using 59 PHA bins.
Reduced chi-squared = 1.039429 for 57 degrees of freedom
Null hypothesis probability = 0.394
Photon flux (15-150 keV) in 0.3840 sec: 0.130868 ( -0.130868 0.16869 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.94573e-09 ( -4.94573e-09 5.06484e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.872424 ( -3.87242 9.12758 )
Epeak [keV] : 9999.13 ( -9999.12 0.865234 )
Norm@50keV : 1.147943E-03 ( -1.147943E-03 1.372126E-03) )
------------------------------------------------------------
Chi-Squared = 59.24195 using 59 PHA bins.
Reduced chi-squared = 1.057892 for 56 degrees of freedom
Null hypothesis probability = 0.358
Photon flux (15-150 keV) in 0.3840 sec: 0.144799 ( -0.144799 0.129483 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31972e-09 ( -5.06319e-09 5.05617e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.37693 ( -15.0000 0.00000 )
beta : -9.34151 ( -9.536743E-06 20.0000 )
Epeak [keV] : 98.6814 ( -34.9252 58.5055 )
Norm@50keV : 3.624986E-02 ( -5.746454E-02 0.735733 )
------------------------------------------------------------
Chi-Squared = 57.20312 using 59 PHA bins.
Reduced chi-squared = 1.040057 for 55 degrees of freedom
Null hypothesis probability = 0.393
Photon flux (15-150 keV) in 0.3840 sec: 0.139954 ( -0.139954 0.113966 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53975e-09 ( -4.94546e-09 4.94546e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.880537 ( -3.88054 9.11946 )
Norm@50keV : 1.136623E-03 ( -1.136623E-03 1.370124E-03) )
------------------------------------------------------------
Chi-Squared = 59.24745 using 59 PHA bins.
Reduced chi-squared = 1.039429 for 57 degrees of freedom
Null hypothesis probability = 0.394
Photon flux (15-150 keV) in 0.3840 sec: 0.130868 ( -0.130868 0.16869 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.94573e-09 ( -4.94573e-09 5.06484e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.872424 ( -3.87242 9.12758 )
Epeak [keV] : 9999.13 ( -9999.12 0.865234 )
Norm@50keV : 1.147943E-03 ( -1.147943E-03 1.372126E-03) )
------------------------------------------------------------
Chi-Squared = 59.24195 using 59 PHA bins.
Reduced chi-squared = 1.057892 for 56 degrees of freedom
Null hypothesis probability = 0.358
Photon flux (15-150 keV) in 0.3840 sec: 0.144799 ( -0.144799 0.129483 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31972e-09 ( -5.06319e-09 5.05617e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.37693 ( -15.0000 0.00000 )
beta : -9.34151 ( -9.536743E-06 20.0000 )
Epeak [keV] : 98.6814 ( -34.9252 58.5055 )
Norm@50keV : 3.624986E-02 ( -5.746454E-02 0.735733 )
------------------------------------------------------------
Chi-Squared = 57.20312 using 59 PHA bins.
Reduced chi-squared = 1.040057 for 55 degrees of freedom
Null hypothesis probability = 0.393
Photon flux (15-150 keV) in 0.3840 sec: 0.139954 ( -0.139954 0.113966 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.53975e-09 ( -4.94546e-09 4.94546e-09 ) ergs/cm2
Plot creation:
Mon Dec 31 21:57:42 EST 2007