batgrbproduct Analysis for Trigger=236944
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 10:37:41 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger236944/GCN5_download_cron
======================================================================
Trigger: 00236944 Segment: 000
BAT Trigger Time: 184373024 [s; MET]
Trigger Stop: 184373088 [s; MET]
UTC: 2006-11-04T22:43:42.449640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 325.440479567475 Dec: 43.8248484710723 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.87
Flight Position: [ source = BAT ]
RA: 325.440479567475 Dec: 43.8248484710723 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 325.656971636291 Dec: 43.798627673511 [deg; J2000]
{ 21h 42m 37.7s , +43d 47' 55.1" }
+/- 6.32608103564988 [arcmin] (estimated 90% radius based on SNR)
+/- 4.63983781532809 [arcmin] (formal 1-sigma fit error)
SNR: 2.18092215602089
RA = 21h 42m 37.7s (325.656972 deg.)
Dec = 43d 47' 55" (43.798628 deg.)
Angular difference between Flight and Ground position is 9.504587 arcmin
Partial Coding Fraction: 0.6484375 [ 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 0.133057 0.098594 0.003829 -0.022766
0.035214 0.035544 0.031497 0.027650 [error]
Peak 0.133057 0.098594 0.003829 -0.022766
0.035214 0.035544 0.031497 0.027650 [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 4.81e-08 3.66e-08 1.85e-08 1.35e-08 1.09e-07 1.18e-07 erg/cm2
Error 1.73e-08 1.82e-08 2.01e-08 2.66e-08 5.04e-08 6.38e-08 erg/cm2
Peak flux Power-law 4.84e-02 2.07e-02 5.25e-03 1.63e-03 7.54e-02 7.60e-02 ph/cm2/s
Error 1.78e-02 9.92e-03 5.54e-03 2.97e-03 2.67e-02 2.72e-02 ph/cm2/s
Fluence Cutoff-PL 4.71e-08 4.63e-08 1.41e-08 9.25e-10 1.09e-07 1.08e-07 erg/cm2
Error 1.94e-08 3.62e-08 1.90e-08 1.89e-08 4.56e-08 5.08e-08 erg/cm2
Peak flux Cutoff-PL 4.66e-02 2.62e-02 4.25e-03 1.50e-04 7.72e-02 7.72e-02 ph/cm2/s
Error 1.99e-02 2.01e-02 5.44e-03 2.17e-03 2.59e-02 2.61e-02 ph/cm2/s
Fluence Band 4.50e-08 4.83e-08 8.11e-09 1.15e-10 1.02e-07 1.02e-07 erg/cm2
Error 2.07e-08 2.69e-08 9.71e-09 5.35e-10 4.96e-08 5.35e-08 erg/cm2
Peak flux Band 4.69e-02 2.62e-02 3.99e-03 1.17e-04 7.70e-02 7.70e-02 ph/cm2/s
Error 1.88e-02 9.76e-03 3.77e-03 2.17e-03 2.58e-02 2.59e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.983 0.891 - - 2.77e-04 2.49e-04 52.754 57
CPL 1.025 3.893 17.4 17.8 5.26e-03 1.25e+00 51.441 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.983 0.891 - - 2.77e-04 2.49e-04 52.754 57
CPL 1.025 4.366 17.4 17.8 5.26e-03 1.25e+00 51.441 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
325.6570 +43.7986 0.0882 34.7 174.8 0.1487 2.2 TRIG_00236944
------------------------------------------
Foreground time interval of the image:
0.000 33.063 (delta_t = 33.063 [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
Time interval is from 0.000 sec. to 33.063 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.98345 ( -0.709677 1.07289 )
Norm@50keV : 2.772091E-04 ( -2.772091E-04 2.214905E-04) )
------------------------------------------------------------
Chi-Squared = 52.75362 using 59 PHA bins.
Reduced chi-squared = 0.9255022 for 57 degrees of freedom
Null hypothesis probability = 0.635
Photon flux (15-150 keV) in 33.06 sec: 7.535925E-02 ( -0.026579 0.0268247 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09499e-07 ( -4.67663e-08 5.40534e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.063 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02489 ( -4.02489 3.76125 )
Epeak [keV] : 17.3812 ( -17.3712 18.2334 )
Norm@50keV : 5.261599E-03 ( -5.261599E-03 2.49238 )
------------------------------------------------------------
Chi-Squared = 51.44103 using 59 PHA bins.
Reduced chi-squared = 0.9185899 for 56 degrees of freedom
Null hypothesis probability = 0.648
Photon flux (15-150 keV) in 33.06 sec: 7.720655E-02 ( -0.0259741 0.0258084 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08504e-07 ( -4.26824e-08 4.86091e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.063 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43450 ( -8.56550 1.35202 )
beta : -9.34972 ( -0.650276 19.3497 )
Epeak [keV] : 12.9355 ( -12.8355 22.7901 )
Norm@50keV : 2.828013E-03 ( -2.828013E-03 97279.3 )
------------------------------------------------------------
Chi-Squared = 51.48108 using 59 PHA bins.
Reduced chi-squared = 0.9360195 for 55 degrees of freedom
Null hypothesis probability = 0.610
Photon flux (15-150 keV) in 33.06 sec: 7.700844E-02 ( -0.0258305 0.0257336 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01996e-07 ( -3.89222e-08 6.03153e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.063 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.98345 ( -0.709677 1.07289 )
Norm@50keV : 2.772091E-04 ( -2.772091E-04 2.214905E-04) )
------------------------------------------------------------
Chi-Squared = 52.75362 using 59 PHA bins.
Reduced chi-squared = 0.9255022 for 57 degrees of freedom
Null hypothesis probability = 0.635
Photon flux (15-150 keV) in 33.06 sec: 7.535925E-02 ( -0.026579 0.0268247 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09499e-07 ( -4.67663e-08 5.40534e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.063 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02489 ( -4.02489 4.70799 )
Epeak [keV] : 17.3812 ( -17.3712 18.2334 )
Norm@50keV : 5.261599E-03 ( -5.261599E-03 2.49238 )
------------------------------------------------------------
Chi-Squared = 51.44103 using 59 PHA bins.
Reduced chi-squared = 0.9185899 for 56 degrees of freedom
Null hypothesis probability = 0.648
Photon flux (15-150 keV) in 33.06 sec: 7.720655E-02 ( -0.0259741 0.0258084 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08504e-07 ( -4.26824e-08 4.86091e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.063 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43450 ( -8.56550 1.35202 )
beta : -9.34972 ( -0.650276 19.3497 )
Epeak [keV] : 12.9355 ( -12.8355 22.7901 )
Norm@50keV : 2.828013E-03 ( -2.828013E-03 97279.3 )
------------------------------------------------------------
Chi-Squared = 51.48108 using 59 PHA bins.
Reduced chi-squared = 0.9360195 for 55 degrees of freedom
Null hypothesis probability = 0.610
Photon flux (15-150 keV) in 33.06 sec: 7.700844E-02 ( -0.0258305 0.0257336 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01996e-07 ( -3.89222e-08 6.03153e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 10:45:35 EST 2008