batgrbproduct Analysis for Trigger=206773
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): Mon Dec 31 19:39:34 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger206773/GCN5_download_cron
======================================================================
Trigger: 00206773 Segment: 000
BAT Trigger Time: 167544980.672 [s; MET]
Trigger Stop: 167544981.696 [s; MET]
UTC: 2006-04-24T04:16:19.520420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 7.35525645990139 Dec: 36.8198378270448 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.1
Image Trigger?: NO
Rate S/N Ratio: 21.2132034355964 [ if not an image trigger ]
Image S/N Ratio: 10.1
Flight Position: [ source = BAT ]
RA: 7.35525645990139 Dec: 36.8198378270448 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 7.36096520530771 Dec: 36.7844293646624 [deg; J2000]
{ 00h 29m 26.6s , +36d 47' 03.9" }
+/- 1.69387388328937 [arcmin] (estimated 90% radius based on SNR)
+/- 0.800173498727513 [arcmin] (formal 1-sigma fit error)
SNR: 14.3266753619924
RA = 0h 29m 26.6s (7.360965 deg.)
Dec = 36d 47' 4" (36.784429 deg.)
Angular difference between Flight and Ground position is 2.142138 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 37.5360000133514 +/- 2.97972348753634
Measured from: -17.6159999966621
to: 19.9200000166893 [s; relative to TRIGTIME]
T50: 9.67200002074242 +/- 9.43266240268934
Measured from: -5.24799999594688
to: 4.42400002479553 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.108000010251999
to: 1.108000010252 [s; relative to TRIGTIME]
Total Fluence
Measured from: -18.7800000011921
to: 20.6240000128746 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.353433 0.427468 0.272257 0.043972
0.039366 0.040056 0.034755 0.029429 [error]
Peak 0.060635 0.075074 0.042414 0.006372
0.007222 0.007688 0.006742 0.004691 [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 1.13e-07 1.83e-07 2.25e-07 5.42e-07 6.76e-07 1.06e-06 erg/cm2
Error 1.89e-08 1.94e-08 3.44e-08 1.73e-07 8.12e-08 2.04e-07 erg/cm2
Peak flux Power-law 6.18e-01 5.42e-01 3.26e-01 2.96e-01 1.61e+00 1.78e+00 ph/cm2/s
Error 1.14e-01 6.51e-02 5.49e-02 9.74e-02 1.93e-01 2.13e-01 ph/cm2/s
Fluence Cutoff-PL 1.06e-07 1.95e-07 2.30e-07 2.52e-07 6.50e-07 7.93e-07 erg/cm2
Error 2.22e-08 1.92e-08 3.78e-08 2.27e-07 8.88e-08 3.05e-07 erg/cm2
Peak flux Cutoff-PL 5.57e-01 5.91e-01 3.39e-01 1.26e-01 1.57e+00 1.61e+00 ph/cm2/s
Error 1.37e-01 9.01e-02 4.73e-02 1.49e-01 2.00e-01 2.51e-01 ph/cm2/s
Fluence Band 1.04e-07 1.94e-07 2.29e-07 2.52e-07 6.49e-07 7.85e-07 erg/cm2
Error 2.20e-08 2.53e-08 3.77e-08 2.85e-07 8.88e-08 3.04e-07 erg/cm2
Peak flux Band 5.50e-01 5.97e-01 3.34e-01 1.75e-01 1.57e+00 1.66e+00 ph/cm2/s
Error 1.38e-01 9.25e-02 6.40e-02 8.10e-02 1.49e-01 2.53e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.707 0.188 - - 1.85e-03 2.11e-04 61.367 57
CPL 1.072 0.770 69.5 4974.0 3.99e-03 5.02e-03 59.981 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.733 0.206 - - 1.20e-02 1.57e-03 62.395 57
CPL 0.956 1.038 62.2 4977.1 3.16e-02 6.89e-02 60.422 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: 6.080000 sec.
T50 in the 50-300 keV band: 3.264000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 39.404 -18.780 20.624
T90 37.536 -17.616 19.920
T50 9.672 -5.248 4.424
Peak 1.000 0.108 1.108
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
7.3610 +36.7844 0.0133 29.7 -64.2 1.1240 14.3 TRIG_00206773
------------------------------------------
Foreground time interval of the image:
-18.780 20.624 (delta_t = 39.404 [sec])
Background time interval of the image:
-239.672 -18.780 (delta_t = 220.892 [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 -18.780 sec. to 20.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70658 ( -0.185652 0.190832 )
Norm@50keV : 1.852866E-03 ( -2.126715E-04 2.095683E-04) )
------------------------------------------------------------
Chi-Squared = 61.36689 using 59 PHA bins.
Reduced chi-squared = 1.076612 for 57 degrees of freedom
Null hypothesis probability = 0.322
Photon flux (15-150 keV) in 39.40 sec: 0.246650 ( -0.026221 0.026252 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75564e-07 ( -8.06439e-08 8.16841e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -18.780 sec. to 20.624 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07192 ( -0.774293 0.766372 )
Epeak [keV] : 69.5211 ( -17.4518 9930.48 )
Norm@50keV : 3.986606E-03 ( -3.986606E-03 6.050473E-03) )
------------------------------------------------------------
Chi-Squared = 59.98114 using 59 PHA bins.
but latest trial 43.3013 gives Chi-Squared = 6.48557
Reduced chi-squared = 1.071092 for 56 degrees of freedom
Null hypothesis probability = 0.333
Photon flux (15-150 keV) in 39.40 sec: 0.241580 ( -0.02728 0.027227 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.50041e-07 ( -8.8319e-08 8.92016e-08 ) ergs/cm2
Band function
Time interval is from -18.780 sec. to 20.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18358 ( -0.651708 0.595799 )
beta : -6.99566 ( -3.00434 5.41621 )
Epeak [keV] : 74.2578 ( -16.2691 9925.74 )
Norm@50keV : 3.498083E-03 ( -3.498083E-03 431.327 )
------------------------------------------------------------
Chi-Squared = 59.92628 using 59 PHA bins.
Reduced chi-squared = 1.089569 for 55 degrees of freedom
Null hypothesis probability = 0.302
Photon flux (15-150 keV) in 39.40 sec: 0.241608 ( -0.027364 0.027184 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.49477e-07 ( -8.82048e-08 8.93947e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73261 ( -0.202186 0.210414 )
Norm@50keV : 1.199907E-02 ( -1.580011E-03 1.552396E-03) )
------------------------------------------------------------
Chi-Squared = 62.39532 using 59 PHA bins.
Reduced chi-squared = 1.094655 for 57 degrees of freedom
Null hypothesis probability = 0.290
Photon flux (15-150 keV) in 1.000 sec: 1.61220 ( -0.19275 0.1929 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10803e-07 ( -1.49763e-08 1.5257e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.955765 ( -1.19172 0.884320 )
Epeak [keV] : 62.1563 ( -16.3879 9937.84 )
Norm@50keV : 3.156006E-02 ( -3.156006E-02 0.106253 )
------------------------------------------------------------
Chi-Squared = 60.42242 using 59 PHA bins.
Reduced chi-squared = 1.078972 for 56 degrees of freedom
Null hypothesis probability = 0.319
Photon flux (15-150 keV) in 1.000 sec: 1.57356 ( -0.20073 0.19897 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04796e-07 ( -1.66792e-08 1.7102e-08 ) ergs/cm2
Band function
Time interval is from 0.108 sec. to 1.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.819270 ( -9.18073 2.96262 )
beta : -2.41629 ( -7.58370 0.762610 )
Epeak [keV] : 57.8189 ( -57.7189 832.833 )
Norm@50keV : 3.803870E-02 ( -1.992747E-02 524.788 )
------------------------------------------------------------
Chi-Squared = 60.08562 using 59 PHA bins.
Reduced chi-squared = 1.092466 for 55 degrees of freedom
Null hypothesis probability = 0.297
Photon flux (15-150 keV) in 1.000 sec: 1.57196 ( -0.19975 0.0988 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05449e-07 ( -1.6209e-08 1.6312e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 19:59:58 EST 2007