batgrbproduct Analysis for Trigger=235645
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 09:23:50 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger235645/GCN5_download_cron
======================================================================
Trigger: 00235645 Segment: 000
BAT Trigger Time: 183636904 [s; MET]
Trigger Stop: 183636968 [s; MET]
UTC: 2006-10-27T10:15:02.467300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 270.812052997813 Dec: -82.2277921845646 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.05
Flight Position: [ source = BAT ]
RA: 270.812052997813 Dec: -82.2277921845646 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 270.893613519397 Dec: -82.2380496833285 [deg; J2000]
{ 18h 03m 34.5s , -82d 14' 17.0" }
+/- 3.59542616302774 [arcmin] (estimated 90% radius based on SNR)
+/- 2.94498943302136 [arcmin] (formal 1-sigma fit error)
SNR: 4.88865369719041
RA = 18h 3m 34.5s (270.893614 deg.)
Dec = -82d 14' 17" (-82.238050 deg.)
Angular difference between Flight and Ground position is 0.903421 arcmin
Partial Coding Fraction: 0.6875 [ 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 0.197988 0.238868 0.090793 -0.020517
0.050524 0.049199 0.043022 0.038482 [error]
Peak 0.197988 0.238868 0.090793 -0.020517
0.050524 0.049199 0.043022 0.038482 [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 6.37e-08 8.84e-08 9.06e-08 1.70e-07 2.97e-07 4.11e-07 erg/cm2
Error 2.30e-08 2.39e-08 3.85e-08 1.43e-07 9.31e-08 1.88e-07 erg/cm2
Peak flux Power-law 3.24e-02 2.48e-02 1.27e-02 9.39e-03 7.43e-02 7.94e-02 ph/cm2/s
Error 1.19e-02 6.70e-03 5.24e-03 7.30e-03 2.01e-02 2.15e-02 ph/cm2/s
Fluence Cutoff-PL 5.87e-08 1.11e-07 6.95e-08 9.29e-09 2.48e-07 2.49e-07 erg/cm2
Error 2.48e-08 3.65e-08 6.36e-08 6.06e-08 7.42e-08 1.50e-07 erg/cm2
Peak flux Cutoff-PL 2.92e-02 3.11e-02 1.04e-02 7.63e-04 7.15e-02 7.15e-02 ph/cm2/s
Error 1.28e-02 1.04e-02 9.07e-03 5.37e-03 2.03e-02 2.05e-02 ph/cm2/s
Fluence Band 5.95e-08 1.05e-07 8.08e-08 8.28e-08 2.80e-07 2.81e-07 erg/cm2
Error 3.21e-08 3.06e-08 3.17e-08 1.01e-07 9.38e-08 1.24e-07 erg/cm2
Peak flux Band 2.91e-02 3.13e-02 1.02e-02 7.01e-04 7.13e-02 7.13e-02 ph/cm2/s
Error 9.33e-03 6.12e-03 3.64e-03 7.54e-03 2.15e-02 1.87e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.964 0.459 - - 5.04e-04 1.63e-04 65.456 57
CPL -0.048 2.520 37.9 5000.0 8.90e-03 2.95e-01 62.839 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.964 0.459 - - 5.04e-04 1.63e-04 65.456 57
CPL -0.048 2.520 37.9 5000.0 8.90e-03 2.95e-01 62.839 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
270.8936 -82.2380 0.0391 35.2 -156.6 0.4513 4.9 TRIG_00235645
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96397 ( -0.437136 0.481077 )
Norm@50keV : 5.036644E-04 ( -1.649729E-04 1.611327E-04) )
------------------------------------------------------------
Chi-Squared = 65.45647 using 59 PHA bins.
Reduced chi-squared = 1.148359 for 57 degrees of freedom
Null hypothesis probability = 0.207
Photon flux (15-150 keV) in 64.00 sec: 7.433367E-02 ( -0.0200736 0.0201036 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96812e-07 ( -9.08435e-08 9.5447e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.807266E-02 ( -2.95193 2.08898 )
Epeak [keV] : 37.9401 ( -37.9301 9962.06 )
Norm@50keV : 8.903402E-03 ( -8.903402E-03 0.581342 )
------------------------------------------------------------
Chi-Squared = 62.83867 using 59 PHA bins.
Reduced chi-squared = 1.122119 for 56 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 64.00 sec: 7.148170E-02 ( -0.0204739 0.0201538 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47785e-07 ( -9.40544e-08 5.44192e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.916015 ( -9.08398 3.99937 )
beta : -9.11971 ( -0.880292 19.1197 )
Epeak [keV] : 40.4309 ( -40.3309 9959.57 )
Norm@50keV : 2.209199E-03 ( -17.4665 5.12728 )
------------------------------------------------------------
Chi-Squared = 63.23479 using 59 PHA bins.
Reduced chi-squared = 1.149723 for 55 degrees of freedom
Null hypothesis probability = 0.208
Photon flux (15-150 keV) in 64.00 sec: 7.133082E-02 ( -0.0185843 0.0243332 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80258e-07 ( -9.42918e-08 9.33939e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96397 ( -0.437136 0.481077 )
Norm@50keV : 5.036644E-04 ( -1.649729E-04 1.611327E-04) )
------------------------------------------------------------
Chi-Squared = 65.45647 using 59 PHA bins.
Reduced chi-squared = 1.148359 for 57 degrees of freedom
Null hypothesis probability = 0.207
Photon flux (15-150 keV) in 64.00 sec: 7.433367E-02 ( -0.0200736 0.0201036 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96812e-07 ( -9.08435e-08 9.5447e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.807266E-02 ( -2.95193 2.08898 )
Epeak [keV] : 37.9401 ( -37.9301 9962.06 )
Norm@50keV : 8.903402E-03 ( -8.903402E-03 0.581342 )
------------------------------------------------------------
Chi-Squared = 62.83867 using 59 PHA bins.
Reduced chi-squared = 1.122119 for 56 degrees of freedom
Null hypothesis probability = 0.247
Photon flux (15-150 keV) in 64.00 sec: 7.148170E-02 ( -0.0204739 0.0201538 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47785e-07 ( -9.40544e-08 5.44192e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.916015 ( -9.08398 3.99937 )
beta : -9.11971 ( -0.880292 19.1197 )
Epeak [keV] : 40.4309 ( -40.3309 9959.57 )
Norm@50keV : 2.209199E-03 ( -17.4665 5.12728 )
------------------------------------------------------------
Chi-Squared = 63.23479 using 59 PHA bins.
Reduced chi-squared = 1.149723 for 55 degrees of freedom
Null hypothesis probability = 0.208
Photon flux (15-150 keV) in 64.00 sec: 7.133082E-02 ( -0.0185843 0.0243332 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80258e-07 ( -9.42918e-08 9.33939e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 09:40:25 EST 2008