batgrbproduct Analysis for Trigger=293795
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 19:24:44 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger293795/GCN5_download_cron
======================================================================
Trigger: 00293795 Segment: 000
BAT Trigger Time: 213741950.272 [s; MET]
Trigger Stop: 213741950.784 [s; MET]
UTC: 2007-10-10T20:45:47.989540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 150.529562485653 Dec: 45.7315763506084 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.16
Image Trigger?: NO
Rate S/N Ratio: 52.9622507074614 [ if not an image trigger ]
Image S/N Ratio: 19.16
Flight Position: [ source = BAT ]
RA: 150.529562485653 Dec: 45.7315763506084 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 150.532344540039 Dec: 45.7346828194254 [deg; J2000]
{ 10h 02m 07.8s , +45d 44' 04.9" }
+/- 0.508204383892184 [arcmin] (estimated 90% radius based on SNR)
+/- 0.139492562709909 [arcmin] (formal 1-sigma fit error)
SNR: 79.9951234149982
RA = 10h 2m 7.8s (150.532345 deg.)
Dec = 45d 44' 5" (45.734683 deg.)
Angular difference between Flight and Ground position is 0.219808 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 35.8759999871254 +/- 2.34576043367063
Measured from: -21.1480000019073
to: 14.727999985218 [s; relative to TRIGTIME]
T50: 5.82800000905991 +/- 0.221882835288521
Measured from: 1.16399997472763
to: 6.99199998378754 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.39599999785423
to: 2.39599999785423 [s; relative to TRIGTIME]
Total Fluence
Measured from: -35.7360000014305
to: 24.1039999723434 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.870251 3.195554 1.699906 0.249612
0.043795 0.044623 0.037933 0.030280 [error]
Peak 0.266130 0.354110 0.215583 0.030175
0.008265 0.009096 0.007666 0.004867 [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 1.01e-06 1.37e-06 1.36e-06 2.46e-06 4.54e-06 6.20e-06 erg/cm2
Error 4.73e-08 3.55e-08 4.21e-08 1.74e-07 1.23e-07 1.96e-07 erg/cm2
Peak flux Power-law 3.07e+00 2.60e+00 1.50e+00 1.30e+00 7.74e+00 8.47e+00 ph/cm2/s
Error 1.92e-01 9.81e-02 6.53e-02 1.16e-01 2.93e-01 2.94e-01 ph/cm2/s
Fluence Cutoff-PL 8.99e-07 1.40e-06 1.40e-06 1.39e-06 4.36e-06 5.07e-06 erg/cm2
Error 6.42e-08 3.86e-08 4.64e-08 3.27e-07 1.28e-07 3.63e-07 erg/cm2
Peak flux Cutoff-PL 2.59e+00 2.74e+00 1.60e+00 6.52e-01 7.36e+00 7.58e+00 ph/cm2/s
Error 2.42e-01 1.13e-01 7.76e-02 1.55e-01 3.16e-01 3.65e-01 ph/cm2/s
Fluence Band 8.80e-07 1.40e-06 1.38e-06 1.83e-06 4.35e-06 5.39e-06 erg/cm2
Error 8.99e-08 4.25e-08 5.64e-08 5.38e-07 1.27e-07 5.51e-07 erg/cm2
Peak flux Band 2.59e+00 2.74e+00 1.60e+00 7.34e-01 7.36e+00 7.67e+00 ph/cm2/s
Error 2.92e-01 1.38e-01 1.03e-01 2.90e-01 3.42e-01 4.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.004 0.048 - - 8.22e-03 1.91e-04 44.036 57
CPL 1.525 0.216 52.2 6.4 1.38e-02 3.19e-03 28.242 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.790 0.062 - - 5.64e-02 1.97e-03 72.465 57
CPL 1.012 0.292 65.5 8.3 1.35e-01 4.44e-02 47.735 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: 33.088000 sec.
T50 in the 50-300 keV band: 4.608000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 59.840 -35.736 24.104
T90 35.876 -21.148 14.728
T50 5.828 1.164 6.992
Peak 1.000 1.396 2.396
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
150.5323 +45.7347 0.0024 29.0 -10.9 8.3295 80.0 TRIG_00293795
------------------------------------------
Foreground time interval of the image:
-35.736 24.104 (delta_t = 59.840 [sec])
Background time interval of the image:
-239.272 -35.736 (delta_t = 203.536 [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 -35.736 sec. to 24.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00353 ( -4.746032E-02 4.768658E-02) )
Norm@50keV : 8.220279E-03 ( -1.915731E-04 1.914185E-04) )
------------------------------------------------------------
Chi-Squared = 44.03638 using 59 PHA bins.
Reduced chi-squared = 0.7725680 for 57 degrees of freedom
Null hypothesis probability = 0.896
Photon flux (15-150 keV) in 59.84 sec: 1.23505 ( -0.0356 0.03589 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53709e-06 ( -1.04187e-07 1.4276e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -35.736 sec. to 24.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52495 ( -0.221860 0.211016 )
Epeak [keV] : 52.1603 ( -6.29242 6.43573 )
Norm@50keV : 1.376450E-02 ( -2.744085E-03 3.640615E-03) )
------------------------------------------------------------
Chi-Squared = 28.24235 using 59 PHA bins.
Reduced chi-squared = 0.5043276 for 56 degrees of freedom
Null hypothesis probability = 0.999
Photon flux (15-150 keV) in 59.84 sec: 1.17394 ( -0.04285 0.04325 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36413e-06 ( -1.28171e-07 1.27734e-07 ) ergs/cm2
Band function
Time interval is from -35.736 sec. to 24.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43206 ( -0.286595 0.491116 )
beta : -2.35008 ( -7.64992 0.224914 )
Epeak [keV] : 49.9094 ( -8.77847 8.07935 )
Norm@50keV : 1.548771E-02 ( -4.280206E-03 1.452398E-02) )
------------------------------------------------------------
Chi-Squared = 27.83685 using 59 PHA bins.
Reduced chi-squared = 0.5061246 for 55 degrees of freedom
Null hypothesis probability = 0.999
Photon flux (15-150 keV) in 59.84 sec: 1.16758 ( -0.04716 0.04633 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.35182e-06 ( -1.27507e-07 1.2704e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.396 sec. to 2.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79018 ( -6.160367E-02 6.200981E-02) )
Norm@50keV : 5.636962E-02 ( -1.969602E-03 1.967147E-03) )
------------------------------------------------------------
Chi-Squared = 72.46490 using 59 PHA bins.
Reduced chi-squared = 1.271314 for 57 degrees of freedom
Null hypothesis probability = 8.134E-02
Photon flux (15-150 keV) in 1.000 sec: 7.73823 ( -0.29249 0.29355 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.19135e-07 ( -1.8413e-08 1.8456e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.396 sec. to 2.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01188 ( -0.301647 0.281896 )
Epeak [keV] : 65.5177 ( -6.29662 10.2435 )
Norm@50keV : 0.134698 ( -3.581799E-02 5.292903E-02) )
------------------------------------------------------------
Chi-Squared = 47.73459 using 59 PHA bins.
Reduced chi-squared = 0.8524033 for 56 degrees of freedom
Null hypothesis probability = 0.776
Photon flux (15-150 keV) in 1.000 sec: 7.36294 ( -0.31574 0.3171 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9618e-07 ( -2.0435e-08 2.0312e-08 ) ergs/cm2
Band function
Time interval is from 1.396 sec. to 2.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.994839 ( -0.298738 0.922787 )
beta : -2.83169 ( -7.16831 0.811193 )
Epeak [keV] : 64.8679 ( -19.1258 10.8570 )
Norm@50keV : 0.137683 ( -3.880552E-02 0.356196 )
------------------------------------------------------------
Chi-Squared = 47.72615 using 59 PHA bins.
Reduced chi-squared = 0.8677482 for 55 degrees of freedom
Null hypothesis probability = 0.746
Photon flux (15-150 keV) in 1.000 sec: 7.35500 ( -0.3603 0.32455 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.95015e-07 ( -2.0403e-08 2.1004e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 19:42:24 EST 2007