batgrbproduct Analysis for Trigger=295527
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): Fri Dec 14 21:50:16 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger295527/GCN5_download_cron
======================================================================
Trigger: 00295527 Segment: 000
BAT Trigger Time: 215286064 [s; MET]
Trigger Stop: 215286128 [s; MET]
UTC: 2007-10-28T17:41:01.676940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 119.846989722008 Dec: 21.4977976788415 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.74
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.74
Flight Position: [ source = BAT ]
RA: 119.846989722008 Dec: 21.4977976788415 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 119.827085633479 Dec: 21.4732764050131 [deg; J2000]
{ 07h 59m 18.5s , +21d 28' 23.8" }
+/- 2.16580153431775 [arcmin] (estimated 90% radius based on SNR)
+/- 0.85622921495466 [arcmin] (formal 1-sigma fit error)
SNR: 10.0847040010316
RA = 7h 59m 18.5s (119.827086 deg.)
Dec = 21d 28' 24" (21.473276 deg.)
Angular difference between Flight and Ground position is 1.843786 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 27.1159999966621 +/- 5.485736050006
Measured from: 20.1520000100136
to: 47.2680000066757 [s; relative to TRIGTIME]
T50: 15.272000014782 +/- 5.96959225401688
Measured from: 26.6399999856949
to: 41.9120000004768 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 41.7520000040531
to: 42.7520000040531 [s; relative to TRIGTIME]
Total Fluence
Measured from: 19.2400000095367
to: 48.891999989748 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.190296 0.231172 0.101563 0.009371
0.026065 0.026453 0.023791 0.021925 [error]
Peak 0.019255 0.010841 0.005593 0.005927
0.004716 0.004767 0.004251 0.004006 [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 5.88e-08 8.61e-08 9.40e-08 1.92e-07 2.98e-07 4.32e-07 erg/cm2
Error 1.15e-08 1.19e-08 2.23e-08 9.13e-08 5.12e-08 1.15e-07 erg/cm2
Peak flux Power-law 1.65e-01 9.61e-02 3.55e-02 1.73e-02 3.06e-01 3.14e-01 ph/cm2/s
Error 7.06e-02 4.33e-02 3.21e-02 3.38e-02 1.09e-01 1.17e-01 ph/cm2/s
Fluence Cutoff-PL 5.56e-08 9.40e-08 9.08e-08 5.86e-08 2.76e-07 3.05e-07 erg/cm2
Error 1.30e-08 1.73e-08 2.67e-08 1.33e-07 5.93e-08 1.51e-07 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 5.48e-08 9.42e-08 3.39e-07 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 1.31e-08 1.48e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.875 0.262 - - 1.09e-03 1.88e-04 58.499 57
CPL 1.131 1.252 48.6 5000.0 2.94e-03 1.09e-02 57.324 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.438 1.007 - - 1.62e-03 1.37e-03 52.234 57
CPL 1.990 0.000 1.0 0.0 2.87e-03 0.00e+00 52.593 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 29.652 19.240 48.892
T90 27.116 20.152 47.268
T50 15.272 26.640 41.912
Peak 1.000 41.752 42.752
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
119.8271 +21.4733 0.0190 11.4 -4.0 0.4895 10.1 TRIG_00295527
------------------------------------------
Foreground time interval of the image:
19.240 48.892 (delta_t = 29.652 [sec])
Background time interval of the image:
-239.000 19.240 (delta_t = 258.240 [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 19.240 sec. to 48.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87488 ( -0.253095 0.270146 )
Norm@50keV : 1.092338E-03 ( -1.907862E-04 1.848807E-04) )
------------------------------------------------------------
Chi-Squared = 58.49947 using 59 PHA bins.
Reduced chi-squared = 1.026307 for 57 degrees of freedom
Null hypothesis probability = 0.420
Photon flux (15-150 keV) in 29.65 sec: 0.155103 ( -0.021223 0.021225 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97816e-07 ( -5.04296e-08 5.19171e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 19.240 sec. to 48.892 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13057 ( -1.47865 1.02619 )
Epeak [keV] : 48.6472 ( -48.6372 9951.35 )
Norm@50keV : 2.942093E-03 ( -2.942093E-03 1.881237E-02) )
------------------------------------------------------------
Chi-Squared = 57.32362 using 59 PHA bins.
but latest trial 2.15676 gives Chi-Squared = 53.0856
Reduced chi-squared = 1.023636 for 56 degrees of freedom
Null hypothesis probability = 0.426
Photon flux (15-150 keV) in 29.65 sec: 0.151006 ( -0.022239 0.022151 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75585e-07 ( -5.68945e-08 6.17909e-08 ) ergs/cm2
Band function
Time interval is from 19.240 sec. to 48.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32058 ( -8.67942 1.23526 )
beta : -8.98204 ( -1.01796 7.30074 )
Epeak [keV] : 51.1045 ( -51.0045 9948.90 )
Norm@50keV : 2.291220E-03 ( -2.291220E-03 2.212988E-02) )
------------------------------------------------------------
Chi-Squared = 57.36993 using 59 PHA bins.
Reduced chi-squared = 1.043090 for 55 degrees of freedom
Null hypothesis probability = 0.387
Photon flux (15-150 keV) in 29.65 sec: 0.151010 ( -0.022235 0.022167 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 41.752 sec. to 42.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43815 ( -0.805389 1.20779 )
Norm@50keV : 1.617225E-03 ( -1.617225E-03 1.113978E-03) )
------------------------------------------------------------
Chi-Squared = 52.23442 using 59 PHA bins.
Reduced chi-squared = 0.9163933 for 57 degrees of freedom
Null hypothesis probability = 0.654
Photon flux (15-150 keV) in 1.000 sec: 0.306066 ( -0.109311 0.109412 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59205e-08 ( -7.6595e-09 9.1915e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 41.752 sec. to 42.752 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99012 ( )
Epeak [keV] : 1.00597 ( )
Norm@50keV : 2.869683E-03 ( )
------------------------------------------------------------
Chi-Squared = 52.59343 using 59 PHA bins.
but latest trial 0.974361 gives Chi-Squared = 15.5019
Reduced chi-squared = 0.9391684 for 56 degrees of freedom
Null hypothesis probability = 0.605
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 41.752 sec. to 42.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75469 ( -6.05699 8.94301 )
beta : -9.12734 ( -1.21056 0.805988 )
Epeak [keV] : 12.6955 ( -12.5955 9987.30 )
Norm@50keV : 4.387942E-03 ( -0.219862 0.151541 )
------------------------------------------------------------
Chi-Squared = 52.80692 using 59 PHA bins.
Reduced chi-squared = 0.9601259 for 55 degrees of freedom
Null hypothesis probability = 0.559
Photon flux (15-150 keV) in 1.000 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Dec 14 22:10:08 EST 2007