batgrbproduct Analysis for Trigger=282073
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 01:42:55 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger282073/GCN5_download_cron
======================================================================
Trigger: 00282073 Segment: 000
BAT Trigger Time: 203322079.808 [s; MET]
Trigger Stop: 203322080.832 [s; MET]
UTC: 2007-06-12T06:21:17.791640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.71324680189 Dec: -8.71856235251288 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.09
Image Trigger?: NO
Rate S/N Ratio: 21.4009345590327 [ if not an image trigger ]
Image S/N Ratio: 9.09
Flight Position: [ source = BAT ]
RA: 261.71324680189 Dec: -8.71856235251288 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.713544839261 Dec: -8.7463836655291 [deg; J2000]
{ 17h 26m 51.3s , -08d 44' 47.0" }
+/- 1.2661910101587 [arcmin] (estimated 90% radius based on SNR)
+/- 0.439049592832668 [arcmin] (formal 1-sigma fit error)
SNR: 21.7115542765498
RA = 17h 26m 51.3s (261.713545 deg.)
Dec = -8d 44' 47" (-8.746384 deg.)
Angular difference between Flight and Ground position is 1.669372 arcmin
Partial Coding Fraction: 0.1796875 [ including projection effects ]
Duration
T90: 19 +/- 4.47213595499958
Measured from: -10.8079999983311
to: 8.19200000166893 [s; relative to TRIGTIME]
T50: 7 +/- 1
Measured from: -3.80799999833107
to: 3.19200000166893 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.80799999833107
to: 0.19200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.8079999983311
to: 10.1920000016689 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.810224 1.074277 0.805223 0.143649
0.072956 0.067364 0.058633 0.046692 [error]
Peak 0.056756 0.125623 0.103148 0.008632
0.015242 0.015486 0.014287 0.010415 [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 2.69e-07 4.64e-07 6.10e-07 1.63e-06 1.79e-06 3.01e-06 erg/cm2
Error 3.41e-08 3.55e-08 5.59e-08 3.23e-07 1.36e-07 3.65e-07 erg/cm2
Peak flux Power-law 6.48e-01 7.78e-01 6.75e-01 1.00e+00 2.45e+00 3.10e+00 ph/cm2/s
Error 1.81e-01 1.38e-01 1.05e-01 3.12e-01 3.78e-01 4.55e-01 ph/cm2/s
Fluence Cutoff-PL 2.44e-07 4.85e-07 6.37e-07 8.62e-07 1.74e-06 2.25e-06 erg/cm2
Error 4.15e-08 4.19e-08 6.39e-08 5.60e-07 1.45e-07 5.71e-07 erg/cm2
Peak flux Cutoff-PL 4.85e-01 8.53e-01 7.80e-01 3.73e-01 2.37e+00 2.49e+00 ph/cm2/s
Error 2.02e-01 1.68e-01 1.36e-01 3.09e-01 3.79e-01 4.70e-01 ph/cm2/s
Fluence Band 2.42e-07 4.84e-07 6.36e-07 8.64e-07 1.74e-06 2.23e-06 erg/cm2
Error 4.11e-08 4.19e-08 6.38e-08 5.61e-07 1.45e-07 5.31e-07 erg/cm2
Peak flux Band 4.84e-01 8.53e-01 7.81e-01 3.70e-01 2.37e+00 2.50e+00 ph/cm2/s
Error 2.02e-01 1.67e-01 1.36e-01 3.03e-01 3.79e-01 3.69e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.603 0.126 - - 7.64e-03 5.50e-04 37.597 57
CPL 1.099 0.520 93.7 318.9 1.34e-02 8.26e-03 34.480 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.205 0.230 - - 2.09e-02 3.05e-03 63.943 57
CPL -0.073 1.118 89.3 62.8 8.23e-02 1.43e-01 58.473 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: 14.272000 sec.
T50 in the 50-300 keV band: 4.288000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 25.000 -14.808 10.192
T90 19.000 -10.808 8.192
T50 7.000 -3.808 3.192
Peak 1.000 -0.808 0.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.7135 -8.7464 0.0089 35.5 89.8 3.0478 21.7 TRIG_00282073
------------------------------------------
Foreground time interval of the image:
-14.808 10.192 (delta_t = 25.000 [sec])
Background time interval of the image:
-239.808 -60.888 (delta_t = 178.920 [sec])
-60.808 -14.808 (delta_t = 46.000 [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 -14.808 sec. to 10.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60332 ( -0.125162 0.126022 )
Norm@50keV : 7.642512E-03 ( -5.509523E-04 5.496354E-04) )
------------------------------------------------------------
Chi-Squared = 37.59697 using 59 PHA bins.
Reduced chi-squared = 0.6595959 for 57 degrees of freedom
Null hypothesis probability = 0.978
Photon flux (15-150 keV) in 25.00 sec: 0.983109 ( -0.074304 0.074571 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78617e-06 ( -1.3541e-07 1.36183e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.808 sec. to 10.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09950 ( -0.551424 0.488724 )
Epeak [keV] : 93.7022 ( -25.3505 612.491 )
Norm@50keV : 1.342323E-02 ( -5.538028E-03 1.097471E-02) )
------------------------------------------------------------
Chi-Squared = 34.47964 using 59 PHA bins.
Reduced chi-squared = 0.6157078 for 56 degrees of freedom
Null hypothesis probability = 0.990
Photon flux (15-150 keV) in 25.00 sec: 0.958590 ( -0.077961 0.07806 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74012e-06 ( -1.4571e-07 1.44335e-07 ) ergs/cm2
Band function
Time interval is from -14.808 sec. to 10.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10040 ( -0.487962 0.552401 )
beta : -9.08182 ( -0.918179 4.82466 )
Epeak [keV] : 93.7921 ( -25.4545 613.533 )
Norm@50keV : 1.340636E-02 ( -5.529008E-03 1.099427E-02) )
------------------------------------------------------------
Chi-Squared = 34.47969 using 59 PHA bins.
Reduced chi-squared = 0.6269035 for 55 degrees of freedom
Null hypothesis probability = 0.986
Photon flux (15-150 keV) in 25.00 sec: 0.958604 ( -0.077979 0.078056 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73829e-06 ( -1.4532e-07 1.446e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.808 sec. to 0.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.20499 ( -0.234156 0.226576 )
Norm@50keV : 2.088711E-02 ( -3.057042E-03 3.049042E-03) )
------------------------------------------------------------
Chi-Squared = 63.94258 using 59 PHA bins.
Reduced chi-squared = 1.121800 for 57 degrees of freedom
Null hypothesis probability = 0.246
Photon flux (15-150 keV) in 1.000 sec: 2.45339 ( -0.37706 0.37973 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11467e-07 ( -3.1686e-08 3.21e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.808 sec. to 0.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -7.259157E-02 ( -1.26814 0.968293 )
Epeak [keV] : 89.2605 ( -22.9800 102.685 )
Norm@50keV : 8.231859E-02 ( -5.243480E-02 0.233839 )
------------------------------------------------------------
Chi-Squared = 58.47263 using 59 PHA bins.
Reduced chi-squared = 1.044154 for 56 degrees of freedom
Null hypothesis probability = 0.385
Photon flux (15-150 keV) in 1.000 sec: 2.37173 ( -0.37688 0.38205 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02461e-07 ( -3.4583e-08 3.3893e-08 ) ergs/cm2
Band function
Time interval is from -0.808 sec. to 0.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 7.132833E-02 ( -0.966835 0.638209 )
beta : -9.25454 ( -0.852459 0.448589 )
Epeak [keV] : 89.2733 ( -23.0282 63.5483 )
Norm@50keV : 8.224256E-02 ( -24.3796 22.3623 )
------------------------------------------------------------
Chi-Squared = 58.47249 using 59 PHA bins.
Reduced chi-squared = 1.063136 for 55 degrees of freedom
Null hypothesis probability = 0.349
Photon flux (15-150 keV) in 1.000 sec: 2.37055 ( -0.37513 0.38325 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00929e-07 ( -3.102e-08 3.0712e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 02:00:17 EST 2007