batgrbproduct Analysis for Trigger=238546
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 12:21:03 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger238546/GCN5_download_cron
======================================================================
Trigger: 00238546 Segment: 000
BAT Trigger Time: 185083696 [s; MET]
Trigger Stop: 185083760 [s; MET]
UTC: 2006-11-13T04:08:14.432580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.721090010689 Dec: 10.640670567438 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.42
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.42
Flight Position: [ source = BAT ]
RA: 288.721090010689 Dec: 10.640670567438 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.56339636238 Dec: 10.6551896204275 [deg; J2000]
{ 19h 14m 15.2s , +10d 39' 18.7" }
+/- 5.05321280354234 [arcmin] (estimated 90% radius based on SNR)
+/- 4.23377074122426 [arcmin] (formal 1-sigma fit error)
SNR: 3.00622737977886
RA = 19h 14m 15.2s (288.563396 deg.)
Dec = 10d 39' 19" (10.655190 deg.)
Angular difference between Flight and Ground position is 9.339417 arcmin
Partial Coding Fraction: 0.7265625 [ 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 0.035780 0.031163 0.012655 -0.006045
0.010476 0.010431 0.008949 0.007576 [error]
Peak 0.035780 0.031163 0.012655 -0.006045
0.010476 0.010431 0.008949 0.007576 [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 1.26e-08 1.27e-08 8.96e-09 1.01e-08 3.82e-08 4.46e-08 erg/cm2
Error 5.09e-09 5.60e-09 7.58e-09 1.81e-08 1.81e-08 2.90e-08 erg/cm2
Peak flux Power-law 1.33e-01 7.46e-02 2.64e-02 1.22e-02 2.41e-01 2.46e-01 ph/cm2/s
Error 5.49e-02 3.16e-02 2.16e-02 2.02e-02 8.33e-02 8.73e-02 ph/cm2/s
Fluence Cutoff-PL 1.25e-08 1.31e-08 8.82e-09 6.35e-09 3.77e-08 4.06e-08 erg/cm2
Error 5.40e-09 6.74e-09 7.62e-09 1.79e-08 1.82e-08 2.77e-08 erg/cm2
Peak flux Cutoff-PL 1.31e-01 7.70e-02 2.62e-02 8.38e-03 2.40e-01 2.44e-01 ph/cm2/s
Error 7.27e-02 3.80e-02 2.26e-02 2.00e-02 8.31e-02 8.63e-02 ph/cm2/s
Fluence Band 1.24e-08 1.31e-08 8.82e-09 6.35e-09 3.76e-08 4.00e-08 erg/cm2
Error 5.36e-09 6.71e-09 7.44e-09 1.79e-08 1.82e-08 2.78e-08 erg/cm2
Peak flux Band 1.31e-01 7.73e-02 2.62e-02 8.41e-03 2.40e-01 2.43e-01 ph/cm2/s
Error 5.90e-02 3.80e-02 2.50e-02 2.00e-02 8.31e-02 8.77e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.501 0.903 - - 1.22e-03 9.95e-04 61.033 57
CPL 1.893 0.000 7.4 4999.9 2.74e-03 1.48e-01 61.059 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.501 0.903 - - 1.22e-03 9.95e-04 61.033 57
CPL 1.893 1.586 7.4 0.0 2.74e-03 9.96e-04 61.059 0
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
288.5634 +10.6552 0.0636 26.1 -131.8 0.0592 3.0 TRIG_00238546
------------------------------------------
Foreground time interval of the image:
56.000 59.120 (delta_t = 3.120 [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 56.000 sec. to 59.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50057 ( -0.706697 1.09842 )
Norm@50keV : 1.223952E-03 ( -1.223952E-03 7.657068E-04) )
------------------------------------------------------------
Chi-Squared = 61.03333 using 59 PHA bins.
Reduced chi-squared = 1.070760 for 57 degrees of freedom
Null hypothesis probability = 0.333
Photon flux (15-150 keV) in 3.120 sec: 0.240522 ( -0.083269 0.083408 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.81978e-08 ( -1.71058e-08 1.91699e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 56.000 sec. to 59.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89292 ( )
Epeak [keV] : 7.40054 ( -1.27624 9998.55 )
Norm@50keV : 2.735560E-03 ( -2.480375E-03 0.292981 )
------------------------------------------------------------
Chi-Squared = 61.05915 using 59 PHA bins.
Reduced chi-squared = 1.090342 for 56 degrees of freedom
Null hypothesis probability = 0.299
Photon flux (15-150 keV) in 3.120 sec: 0.239926 ( -0.082796 0.083412 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76799e-08 ( -1.68809e-08 1.96179e-08 ) ergs/cm2
Band function
Time interval is from 56.000 sec. to 59.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76751 ( -4.40009 10.5999 )
beta : -9.18319 ( -1.09855 0.706900 )
Epeak [keV] : 12.9164 ( -12.8164 9987.08 )
Norm@50keV : 3.339586E-03 ( -0.166353 0.104064 )
------------------------------------------------------------
Chi-Squared = 61.09677 using 59 PHA bins.
Reduced chi-squared = 1.110850 for 55 degrees of freedom
Null hypothesis probability = 0.266
Photon flux (15-150 keV) in 3.120 sec: 0.239934 ( -0.082865 0.083382 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75935e-08 ( -1.68869e-08 1.95774e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 56.000 sec. to 59.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50057 ( -0.706697 1.09842 )
Norm@50keV : 1.223952E-03 ( -1.223952E-03 7.657068E-04) )
------------------------------------------------------------
Chi-Squared = 61.03333 using 59 PHA bins.
Reduced chi-squared = 1.070760 for 57 degrees of freedom
Null hypothesis probability = 0.333
Photon flux (15-150 keV) in 3.120 sec: 0.240522 ( -0.083269 0.083408 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.81978e-08 ( -1.71058e-08 1.91699e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 56.000 sec. to 59.120 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89292 ( -3.03802 0.133948 )
Epeak [keV] : 7.40054 ( )
Norm@50keV : 2.735560E-03 ( -1.246545E-03 7.453363E-04) )
------------------------------------------------------------
Chi-Squared = 61.05915 using 59 PHA bins.
but latest trial 2.02285 gives Chi-Squared = 1.13729
Reduced chi-squared = 1.090342 for 56 degrees of freedom
Null hypothesis probability = 0.299
Photon flux (15-150 keV) in 3.120 sec: 0.239926 ( -0.082796 0.083412 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76799e-08 ( -1.68809e-08 1.96179e-08 ) ergs/cm2
Band function
Time interval is from 56.000 sec. to 59.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76751 ( -4.40009 10.5999 )
beta : -9.18319 ( -1.09855 0.706900 )
Epeak [keV] : 12.9164 ( -12.8164 9987.08 )
Norm@50keV : 3.339586E-03 ( -0.166353 0.104064 )
------------------------------------------------------------
Chi-Squared = 61.09677 using 59 PHA bins.
Reduced chi-squared = 1.110850 for 55 degrees of freedom
Null hypothesis probability = 0.266
Photon flux (15-150 keV) in 3.120 sec: 0.239934 ( -0.082865 0.083382 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75935e-08 ( -1.68869e-08 1.95774e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 12:24:30 EST 2008