batgrbproduct Analysis for Trigger=214805
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): Tue Jan 1 17:12:49 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger214805/GCN5_download_cron
======================================================================
Trigger: 00214805 Segment: 000
BAT Trigger Time: 171981829.76 [s; MET]
Trigger Stop: 171981830.784 [s; MET]
UTC: 2006-06-14T12:43:48.504600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 320.86249529876 Dec: -53.034119723373 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.45
Image Trigger?: NO
Rate S/N Ratio: 68.3885955404847 [ if not an image trigger ]
Image S/N Ratio: 18.45
Flight Position: [ source = BAT ]
RA: 320.86249529876 Dec: -53.034119723373 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 320.874594927068 Dec: -53.0271668708953 [deg; J2000]
{ 21h 23m 29.9s , -53d 01' 37.8" }
+/- 0.899904932105104 [arcmin] (estimated 90% radius based on SNR)
+/- 0.380333989680234 [arcmin] (formal 1-sigma fit error)
SNR: 35.3632167356284
RA = 21h 23m 29.9s (320.874595 deg.)
Dec = -53d 1' 38" (-53.027167 deg.)
Angular difference between Flight and Ground position is 0.603859 arcmin
Partial Coding Fraction: 0.15625 [ including projection effects ]
Duration
T90: 106.008000016212 +/- 3.31042292001389
Measured from: 0.324000000953674
to: 106.332000017166 [s; relative to TRIGTIME]
T50: 43.0399999916553 +/- 0.751201712375737
Measured from: 21.0400000214577
to: 64.080000013113 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -1.32400000095367
to: -0.324000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.49599999189377
to: 176.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 15.166577 13.927469 7.524527 1.549363
0.121642 0.123188 0.105910 0.080498 [error]
Peak 0.321347 0.483306 0.356867 0.102820
0.022020 0.024934 0.023136 0.016398 [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 5.42e-06 6.78e-06 6.19e-06 9.84e-06 2.17e-05 2.82e-05 erg/cm2
Error 2.22e-07 1.52e-07 1.34e-07 5.18e-07 3.93e-07 5.63e-07 erg/cm2
Peak flux Power-law 4.12e+00 3.85e+00 2.51e+00 2.52e+00 1.15e+01 1.30e+01 ph/cm2/s
Error 4.49e-01 2.55e-01 1.92e-01 3.98e-01 7.38e-01 7.84e-01 ph/cm2/s
Fluence Cutoff-PL 5.40e-06 6.78e-06 6.19e-06 9.78e-06 2.17e-05 2.82e-05 erg/cm2
Error 2.21e-07 1.52e-07 1.34e-07 5.15e-07 3.93e-07 5.61e-07 erg/cm2
Peak flux Cutoff-PL 4.04e+00 3.89e+00 2.53e+00 2.27e+00 1.15e+01 1.27e+01 ph/cm2/s
Error 5.32e-01 2.88e-01 2.21e-01 7.54e-01 7.73e-01 1.09e+00 ph/cm2/s
Fluence Band 5.36e-06 6.76e-06 6.18e-06 9.84e-06 2.17e-05 2.82e-05 erg/cm2
Error 1.56e-07 1.21e-07 1.20e-07 4.60e-07 3.85e-07 5.53e-07 erg/cm2
Peak flux Band 3.96e+00 3.94e+00 2.51e+00 2.39e+00 1.14e+01 1.28e+01 ph/cm2/s
Error 5.52e-01 3.21e-01 2.05e-01 4.11e-01 7.80e-01 9.49e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.132 0.038 - - 1.31e-02 2.29e-04 40.815 57
CPL 1.995 0.000 2.2 8.2 1.48e-02 6.14e-04 46.425 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.622 0.108 - - 8.90e-02 5.49e-03 48.726 57
CPL 1.520 0.321 245.1 5000.0 1.00e-01 3.89e-02 48.577 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: 99.200000 sec.
T50 in the 50-300 keV band: 41.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 177.968 -1.496 176.472
T90 106.008 0.324 106.332
T50 43.040 21.040 64.080
Peak 1.000 -1.324 -0.324
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
320.8746 -53.0272 0.0055 44.1 34.2 6.7878 35.4 TRIG_00214805
------------------------------------------
Foreground time interval of the image:
-1.496 12.641 (delta_t = 14.137 [sec])
Background time interval of the image:
-239.760 -1.496 (delta_t = 238.264 [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 -1.496 sec. to 176.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13221 ( -3.836489E-02 3.857851E-02) )
Norm@50keV : 1.310326E-02 ( -2.290346E-04 2.290262E-04) )
------------------------------------------------------------
Chi-Squared = 40.81511 using 59 PHA bins.
Reduced chi-squared = 0.7160546 for 57 degrees of freedom
Null hypothesis probability = 0.948
Photon flux (15-150 keV) in 178.0 sec: 2.09487 ( -0.05504 0.0557 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17423e-05 ( -3.92668e-07 3.9427e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.496 sec. to 176.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99542 ( )
Epeak [keV] : 2.16801 ( -0.297955 16.1546 )
Norm@50keV : 1.475942E-02 ( -6.060209E-04 6.221151E-04) )
------------------------------------------------------------
Chi-Squared = 46.42521 using 59 PHA bins.
Reduced chi-squared = 0.8290215 for 56 degrees of freedom
Null hypothesis probability = 0.815
Photon flux (15-150 keV) in 178.0 sec: 2.09258 ( -0.05498 0.05563 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17404e-05 ( -3.93202e-07 3.93558e-07 ) ergs/cm2
Band function
Time interval is from -1.496 sec. to 176.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.64417 ( -6.950378E-03 14.9930 )
beta : -2.11915 ( -3.851461E-02 3.839588E-02) )
Epeak [keV] : 9.52582 ( -9.42582 9990.47 )
Norm@50keV : 4.038334E-02 ( -3.112924E-02 3.112292E-02) )
------------------------------------------------------------
Chi-Squared = 41.12929 using 59 PHA bins.
Reduced chi-squared = 0.7478053 for 55 degrees of freedom
Null hypothesis probability = 0.918
Photon flux (15-150 keV) in 178.0 sec: 2.09495 ( -0.03666 902.075 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17197e-05 ( -3.90176e-07 3.79496e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -1.324 sec. to -0.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62159 ( -0.107257 0.108399 )
Norm@50keV : 8.897675E-02 ( -5.494624E-03 5.479239E-03) )
------------------------------------------------------------
Chi-Squared = 48.72588 using 59 PHA bins.
Reduced chi-squared = 0.8548400 for 57 degrees of freedom
Null hypothesis probability = 0.774
Photon flux (15-150 keV) in 1.000 sec: 11.5118 ( -0.7369 0.7384 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.30028e-07 ( -5.4048e-08 5.4224e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.324 sec. to -0.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51956 ( -0.436604 0.206085 )
Epeak [keV] : 245.058 ( -245.048 9754.94 )
Norm@50keV : 9.995263E-02 ( -1.614019E-02 6.156636E-02) )
------------------------------------------------------------
Chi-Squared = 48.57732 using 59 PHA bins.
Reduced chi-squared = 0.8674521 for 56 degrees of freedom
Null hypothesis probability = 0.749
Photon flux (15-150 keV) in 1.000 sec: 11.4644 ( -0.7621 0.7838 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27025e-07 ( -5.6777e-08 5.5977e-08 ) ergs/cm2
Band function
Time interval is from -1.324 sec. to -0.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22100 ( -8.77900 2.49035 )
beta : -1.68770 ( -8.31230 0.164917 )
Epeak [keV] : 75.6630 ( -75.5630 9924.34 )
Norm@50keV : 0.151914 ( -4.788280E-02 490.539 )
------------------------------------------------------------
Chi-Squared = 48.37679 using 59 PHA bins.
Reduced chi-squared = 0.8795779 for 55 degrees of freedom
Null hypothesis probability = 0.724
Photon flux (15-150 keV) in 1.000 sec: 11.4107 ( -0.7746 0.7862 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.26091e-07 ( -5.6688e-08 5.4385e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 17:29:23 EST 2008