batgrbproduct Analysis for Trigger=303172
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): Thu Feb 14 02:39:27 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger303172/GCN5_download_cron
======================================================================
Trigger: 00303172 Segment: 000
BAT Trigger Time: 224605311.552 [s; MET]
Trigger Stop: 224605312.576 [s; MET]
UTC: 2008-02-13T14:21:48.980040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.681128352042 Dec: -24.2301125507352 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.61
Image Trigger?: NO
Rate S/N Ratio: 10.3440804327886 [ if not an image trigger ]
Image S/N Ratio: 5.61
Flight Position: [ source = BAT ]
RA: 273.681128352042 Dec: -24.2301125507352 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.634311259116 Dec: -24.2398357306229 [deg; J2000]
{ 18h 14m 32.2s , -24d 14' 23.4" }
+/- 3.18519915022521 [arcmin] (estimated 90% radius based on SNR)
+/- 2.01368576114209 [arcmin] (formal 1-sigma fit error)
SNR: 5.81235084303264
RA = 18h 14m 32.2s (273.634311 deg.)
Dec = -24d 14' 23" (-24.239836 deg.)
Angular difference between Flight and Ground position is 2.627061 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
T50: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02400001883507 second)
Measured from: 1.49011611938477e-08
to: 1.02400003373623 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.009152 0.006499 0.025142 0.017612
0.006752 0.006350 0.005863 0.005572 [error]
Peak 0.009152 0.006499 0.025142 0.017612
0.006752 0.006350 0.005863 0.005572 [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 7.19e-10 3.56e-09 1.42e-08 2.13e-07 4.22e-08 2.54e-07 erg/cm2
Error 1.22e-09 3.54e-09 9.82e-09 4.33e-07 1.46e-08 3.38e-07 erg/cm2
Peak flux Power-law 2.26e-02 5.70e-02 1.15e-01 5.83e-01 3.10e-01 7.78e-01 ph/cm2/s
Error 3.78e-02 5.91e-02 8.07e-02 7.67e-01 2.26e-01 6.87e-01 ph/cm2/s
Fluence Cutoff-PL 6.26e-10 3.44e-09 1.42e-08 2.14e-07 4.22e-08 2.15e-07 erg/cm2
Error 1.23e-09 3.54e-09 9.83e-09 3.76e-07 1.46e-08 3.23e-07 erg/cm2
Peak flux Cutoff-PL 2.25e-02 5.69e-02 1.15e-01 5.81e-01 3.10e-01 7.75e-01 ph/cm2/s
Error 3.77e-02 5.91e-02 8.07e-02 6.36e-01 1.37e-01 5.72e-01 ph/cm2/s
Fluence Band 7.00e-10 3.50e-09 1.42e-08 2.14e-07 4.22e-08 1.64e-07 erg/cm2
Error 1.21e-09 3.53e-09 9.82e-09 3.80e-07 1.46e-08 0.00e+00 erg/cm2
Peak flux Band 2.25e-02 5.69e-02 1.15e-01 5.80e-01 3.10e-01 7.75e-01 ph/cm2/s
Error 3.77e-02 5.91e-02 8.59e-02 1.40e+00 1.37e-01 5.72e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.013 1.928 - - 2.29e-03 1.92e-03 72.468 57
CPL -0.360 6.417 584.8 0.0 2.77e-03 1.93e-03 72.558 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.013 1.928 - - 2.29e-03 1.92e-03 72.468 57
CPL -0.360 6.429 584.8 0.0 2.77e-03 1.93e-03 72.558 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: 0.896000 sec.
T50 in the 50-300 keV band: 0.640000 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
273.6343 -24.2398 0.0334 25.0 -4.3 0.0718 5.8 TRIG_00303172
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-52.451 -7.552 (delta_t = 44.899 [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: -1.335627E-02 ( -2.98664 0.868460 )
Norm@50keV : 2.288868E-03 ( -2.288868E-03 1.544731E-03) )
------------------------------------------------------------
Chi-Squared = 72.46809 using 59 PHA bins.
Reduced chi-squared = 1.271370 for 57 degrees of freedom
Null hypothesis probability = 8.130E-02
Photon flux (15-150 keV) in 1.024 sec: 0.310474 ( -0.310474 0.14128 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.21685e-08 ( -1.46326e-08 1.46302e-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: -0.360185 ( -2.63982 10.1948 )
Epeak [keV] : 584.755 ( )
Norm@50keV : 2.772547E-03 ( -2.338011E-03 1.529587E-03) )
------------------------------------------------------------
Chi-Squared = 72.55823 using 59 PHA bins.
Reduced chi-squared = 1.295683 for 56 degrees of freedom
Null hypothesis probability = 6.757E-02
Photon flux (15-150 keV) in 1.024 sec: 0.310404 ( -0.133692 0.141151 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22067e-08 ( -1.46456e-08 1.46437e-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 : -0.374726 ( -9.62527 5.37473 )
beta : 1.321267E-02 ( -0.868316 9.98679 )
Epeak [keV] : 22.5426 ( -22.4426 9977.46 )
Norm@50keV : 3.260704E-03 ( -3.260704E-03 10355.7 )
------------------------------------------------------------
Chi-Squared = 72.46809 using 59 PHA bins.
Reduced chi-squared = 1.317602 for 55 degrees of freedom
Null hypothesis probability = 5.727E-02
Photon flux (15-150 keV) in 1.024 sec: 0.310411 ( -0.133642 0.141009 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.21832e-08 ( -1.46412e-08 1.46464e-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: -1.335627E-02 ( -2.98664 0.868460 )
Norm@50keV : 2.288868E-03 ( -2.288868E-03 1.544731E-03) )
------------------------------------------------------------
Chi-Squared = 72.46809 using 59 PHA bins.
Reduced chi-squared = 1.271370 for 57 degrees of freedom
Null hypothesis probability = 8.130E-02
Photon flux (15-150 keV) in 1.024 sec: 0.310474 ( -0.310474 0.14128 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.21685e-08 ( -1.46326e-08 1.46302e-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: -0.360185 ( -2.63982 10.2182 )
Epeak [keV] : 584.755 ( )
Norm@50keV : 2.772547E-03 ( -2.338011E-03 1.529587E-03) )
------------------------------------------------------------
Chi-Squared = 72.55823 using 59 PHA bins.
Reduced chi-squared = 1.295683 for 56 degrees of freedom
Null hypothesis probability = 6.757E-02
Photon flux (15-150 keV) in 1.024 sec: 0.310404 ( -0.133692 0.141151 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22067e-08 ( -1.46456e-08 1.46437e-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 : -0.374726 ( -9.62527 5.37473 )
beta : 1.321267E-02 ( -0.868316 9.98679 )
Epeak [keV] : 22.5426 ( -22.4426 9977.46 )
Norm@50keV : 3.260704E-03 ( -3.260704E-03 10355.7 )
------------------------------------------------------------
Chi-Squared = 72.46809 using 59 PHA bins.
Reduced chi-squared = 1.317602 for 55 degrees of freedom
Null hypothesis probability = 5.727E-02
Photon flux (15-150 keV) in 1.024 sec: 0.310411 ( -0.133642 0.141009 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.21832e-08 ( -1.46412e-08 1.46464e-08 ) ergs/cm2
Plot creation:
Thu Feb 14 02:56:44 EST 2008