batgrbproduct Analysis for Trigger=294645
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 20:36:10 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger294645/GCN5_download_cron
======================================================================
Trigger: 00294645 Segment: 000
BAT Trigger Time: 214389464 [s; MET]
Trigger Stop: 214389840 [s; MET]
UTC: 2007-10-18T08:37:41.700440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 164.67599151863 Dec: 53.8304941752699 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.55
Flight Position: [ source = BAT ]
RA: 164.67599151863 Dec: 53.8304941752699 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 164.838558025808 Dec: 53.8133333008632 [deg; J2000]
{ 10h 59m 21.3s , +53d 48' 48.0" }
+/- 3.0484149123979 [arcmin] (estimated 90% radius based on SNR)
+/- 1.79842946043976 [arcmin] (formal 1-sigma fit error)
SNR: 6.18847988438852
RA = 10h 59m 21.3s (164.838558 deg.)
Dec = 53d 48' 48" (53.813333 deg.)
Angular difference between Flight and Ground position is 5.849091 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 250.096000015736 +/- 39.1938346637474
Measured from: 155.527999997139
to: 405.624000012875 [s; relative to TRIGTIME]
T50: 152.791999995708 +/- 70.3085145555887
Measured from: 200.104000002146
to: 352.895999997854 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 124.180000007153
to: 125.180000007153 [s; relative to TRIGTIME]
Total Fluence
Measured from: 113.051999986172
to: 417.715999990702 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.620955 0.547382 0.502317 0.095403
0.079946 0.080496 0.071231 0.062057 [error]
Peak 0.006340 0.002799 0.013717 0.010380
0.004543 0.004566 0.004079 0.003650 [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 1.60e-07 2.72e-07 3.51e-07 9.15e-07 1.03e-06 1.70e-06 erg/cm2
Error 3.57e-08 3.72e-08 7.14e-08 3.98e-07 1.67e-07 4.58e-07 erg/cm2
Peak flux Power-law 1.08e-02 2.85e-02 6.02e-02 3.29e-01 1.62e-01 4.28e-01 ph/cm2/s
Error 2.77e-02 3.74e-02 4.68e-02 5.13e-01 1.33e-01 4.76e-01 ph/cm2/s
Fluence Cutoff-PL 1.60e-07 2.72e-07 3.51e-07 9.07e-07 1.03e-06 1.63e-06 erg/cm2
Error 3.57e-08 3.73e-08 7.15e-08 3.95e-07 1.67e-07 4.76e-07 erg/cm2
Peak flux Cutoff-PL 1.07e-02 2.84e-02 6.03e-02 3.27e-01 1.62e-01 4.27e-01 ph/cm2/s
Error 2.76e-02 3.73e-02 4.69e-02 5.57e-01 1.33e-01 5.17e-01 ph/cm2/s
Fluence Band 1.58e-07 2.73e-07 3.53e-07 9.19e-07 1.04e-06 1.70e-06 erg/cm2
Error 3.68e-08 3.86e-08 5.37e-08 3.57e-07 1.54e-07 4.82e-07 erg/cm2
Peak flux Band 1.07e-02 2.84e-02 6.03e-02 3.27e-01 1.62e-01 4.27e-01 ph/cm2/s
Error 2.76e-02 3.74e-02 5.42e-02 5.23e-01 1.33e-01 5.37e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.630 0.256 - - 3.64e-04 5.41e-05 73.740 57
CPL 1.564 0.934 330.5 0.0 3.93e-04 2.44e-04 73.900 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.082 2.081 - - 1.17e-03 1.15e-03 60.715 57
CPL -0.102 2.078 9996.5 5000.0 1.18e-03 1.16e-03 60.717 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 304.664 113.052 417.716
T90 250.096 155.528 405.624
T50 152.792 200.104 352.896
Peak 1.000 124.180 125.180
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
164.8386 +53.8133 0.0310 20.0 -178.3 1.7059 6.2 TRIG_00294645
------------------------------------------
Foreground time interval of the image:
113.052 417.716 (delta_t = 304.664 [sec])
Background time interval of the image:
-12.099 108.720 (delta_t = 120.819 [sec])
110.000 113.052 (delta_t = 3.052 [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 113.052 sec. to 417.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63022 ( -0.252832 0.259586 )
Norm@50keV : 3.640764E-04 ( -5.472085E-05 5.338236E-05) )
------------------------------------------------------------
Chi-Squared = 73.73995 using 59 PHA bins.
Reduced chi-squared = 1.293683 for 57 degrees of freedom
Null hypothesis probability = 6.715E-02
Photon flux (15-150 keV) in 304.7 sec: 4.723452E-02 ( -0.00644668 0.00645498 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03387e-06 ( -1.65239e-07 1.68249e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 113.052 sec. to 417.716 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56447 ( -0.616177 1.25188 )
Epeak [keV] : 330.540 ( )
Norm@50keV : 3.932521E-04 ( -6.018116E-05 4.285968E-04) )
------------------------------------------------------------
Chi-Squared = 73.89989 using 59 PHA bins.
but latest trial 2.81626 gives Chi-Squared = 2.61783
Reduced chi-squared = 1.319641 for 56 degrees of freedom
Null hypothesis probability = 5.477E-02
Photon flux (15-150 keV) in 304.7 sec: 4.721876E-02 ( -0.00644468 0.00645304 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03411e-06 ( -1.65498e-07 1.68066e-07 ) ergs/cm2
Band function
Time interval is from 113.052 sec. to 417.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18544 ( -11.2146 3.78544 )
beta : -1.64485 ( -0.332694 0.268106 )
Epeak [keV] : 45.4569 ( -24.7935 958.883 )
Norm@50keV : 7.851216E-04 ( -6.711564E-02 70.0629 )
------------------------------------------------------------
Chi-Squared = 73.66309 using 59 PHA bins.
Reduced chi-squared = 1.339329 for 55 degrees of freedom
Null hypothesis probability = 4.721E-02
Photon flux (15-150 keV) in 304.7 sec: 4.723456E-02 ( -0.00654699 0.00640002 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03757e-06 ( -1.52682e-07 1.56308e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 124.180 sec. to 125.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -8.197277E-02 ( -2.91803 1.24375 )
Norm@50keV : 1.166911E-03 ( -1.166911E-03 1.128556E-03) )
------------------------------------------------------------
Chi-Squared = 60.71465 using 59 PHA bins.
Reduced chi-squared = 1.065169 for 57 degrees of freedom
Null hypothesis probability = 0.344
Photon flux (15-150 keV) in 1.000 sec: 0.162376 ( -0.162376 0.10368 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19227e-08 ( -1.02021e-08 1.01923e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 124.180 sec. to 125.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.102186 ( -2.89781 1.25819 )
Epeak [keV] : 9996.45 ( -9996.44 3.54883 )
Norm@50keV : 1.177747E-03 ( -1.177747E-03 1.133917E-03) )
------------------------------------------------------------
Chi-Squared = 60.71671 using 59 PHA bins.
Reduced chi-squared = 1.084227 for 56 degrees of freedom
Null hypothesis probability = 0.310
Photon flux (15-150 keV) in 1.000 sec: 0.162312 ( -0.162312 0.103578 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19438e-08 ( -1.95219e-08 1.01992e-08 ) ergs/cm2
Band function
Time interval is from 124.180 sec. to 125.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.409578 ( -9.59042 5.40958 )
beta : 8.178790E-02 ( -1.24365 9.91821 )
Epeak [keV] : 23.4194 ( -23.3194 9976.58 )
Norm@50keV : 1.629171E-03 ( -1.629172E-03 4857.95 )
------------------------------------------------------------
Chi-Squared = 60.71465 using 59 PHA bins.
Reduced chi-squared = 1.103903 for 55 degrees of freedom
Null hypothesis probability = 0.278
Photon flux (15-150 keV) in 1.000 sec: 0.162329 ( -0.162329 0.103517 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19293e-08 ( -2.19293e-08 1.01909e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 20:54:53 EST 2007