batgrbproduct Analysis for Trigger=292826
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 16:11:41 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger292826/SDC
======================================================================
Trigger: 00292826 Segment: 000
BAT Trigger Time: 212949110.336 [s; MET]
Trigger Stop: 212949112.384 [s; MET]
UTC: 2007-10-01T16:31:48.074080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 149.76568444715 Dec: -59.7508699680511 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: NO
Rate S/N Ratio: 12.8062484748657 [ if not an image trigger ]
Image S/N Ratio: 7.13
Flight Position: [ source = BAT ]
RA: 149.76568444715 Dec: -59.7508699680511 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 149.71257944178 Dec: -59.7622557165796 [deg; J2000]
{ 09h 58m 51.0s , -59d 45' 44.1" }
+/- 2.00532593753489 [arcmin] (estimated 90% radius based on SNR)
+/- 0.927745595316571 [arcmin] (formal 1-sigma fit error)
SNR: 11.2570751160056
RA = 9h 58m 51.0s (149.712579 deg.)
Dec = -59d 45' 44" (-59.762256 deg.)
Angular difference between Flight and Ground position is 1.744208 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 57.4880000054836 +/- 3.9323723364523
Measured from: 0.907999992370605
to: 58.3959999978542 [s; relative to TRIGTIME]
T50: 43.636000007391 +/- 2.08556564065188
Measured from: 6.57600000500679
to: 50.2120000123978 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 48.1400000154972
to: 49.1400000154972 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0439999997615814
to: 61.8000000119209 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.461102 0.542246 0.314441 0.094773
0.039780 0.039583 0.034521 0.029700 [error]
Peak 0.038798 0.044499 0.018880 0.005041
0.005379 0.005334 0.004561 0.003739 [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 1.32e-07 2.13e-07 2.59e-07 6.16e-07 7.80e-07 1.22e-06 erg/cm2
Error 1.86e-08 1.85e-08 3.40e-08 1.70e-07 7.87e-08 2.00e-07 erg/cm2
Peak flux Power-law 3.70e-01 2.91e-01 1.54e-01 1.18e-01 8.68e-01 9.32e-01 ph/cm2/s
Error 7.48e-02 4.23e-02 3.57e-02 5.13e-02 1.26e-01 1.38e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-07 2.21e-07 2.61e-07 3.58e-07 7.57e-07 9.70e-07 erg/cm2
Error 2.15e-08 1.80e-08 3.60e-08 2.56e-07 8.92e-08 3.30e-07 erg/cm2
Peak flux Cutoff-PL 3.20e-01 3.48e-01 1.49e-01 2.10e-02 8.35e-01 8.38e-01 ph/cm2/s
Error 8.71e-02 6.16e-02 4.71e-02 3.60e-02 1.28e-01 1.32e-01 ph/cm2/s
Fluence Band 9.84e-07 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.19e-01 3.48e-01 1.49e-01 2.06e-02 8.34e-01 8.37e-01 ph/cm2/s
Error 8.27e-02 4.04e-02 3.26e-02 4.60e-02 1.24e-01 1.23e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.719 0.163 - - 1.36e-03 1.30e-04 43.568 57
CPL 1.304 0.590 78.3 4974.6 2.26e-03 1.80e-03 42.758 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.920 0.255 - - 6.00e-03 1.07e-03 50.263 57
CPL 0.335 1.445 43.5 13.9 4.97e-02 2.42e-01 44.779 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: 54.592000 sec.
T50 in the 50-300 keV band: 42.688000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 61.844 -0.044 61.800
T90 57.488 0.908 58.396
T50 43.636 6.576 50.212
Peak 1.000 48.140 49.140
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
149.7126 -59.7623 0.0172 14.9 63.4 0.6653 11.3 TRIG_00292826
------------------------------------------
Foreground time interval of the image:
-0.044 34.269 (delta_t = 34.313 [sec])
Background time interval of the image:
-194.131 -0.044 (delta_t = 194.087 [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 -0.044 sec. to 61.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71925 ( -0.160835 0.164746 )
Norm@50keV : 1.364316E-03 ( -1.313672E-04 1.294420E-04) )
------------------------------------------------------------
Chi-Squared = 43.56824 using 59 PHA bins.
Reduced chi-squared = 0.7643552 for 57 degrees of freedom
Null hypothesis probability = 0.905
Photon flux (15-150 keV) in 61.84 sec: 0.182433 ( -0.015976 0.015995 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80087e-07 ( -7.82771e-08 7.92047e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 61.800 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30431 ( -0.628630 0.551793 )
Epeak [keV] : 78.2805 ( -27.5643 9921.72 )
Norm@50keV : 2.259630E-03 ( -1.003625E-03 2.589563E-03) )
------------------------------------------------------------
Chi-Squared = 42.75820 using 59 PHA bins.
but latest trial 31.3952 gives Chi-Squared = 3.99365
Reduced chi-squared = 0.7635393 for 56 degrees of freedom
Null hypothesis probability = 0.904
Photon flux (15-150 keV) in 61.84 sec: 0.179596 ( -0.016815 0.016657 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.56878e-07 ( -8.95196e-08 8.89692e-08 ) ergs/cm2
Band function
Time interval is from -0.044 sec. to 61.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27956 ( -0.577473 0.607397 )
beta : -8.75049 ( -1.24951 7.16681 )
Epeak [keV] : 76.3971 ( -23.3377 9923.60 )
Norm@50keV : 2.338632E-03 ( -1.112517E-03 2.528939E-03) )
------------------------------------------------------------
Chi-Squared = 42.78316 using 59 PHA bins.
Reduced chi-squared = 0.7778756 for 55 degrees of freedom
Null hypothesis probability = 0.885
Photon flux (15-150 keV) in 61.84 sec: 0.179593 ( -0.016861 0.016781 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 48.140 sec. to 49.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92015 ( -0.246234 0.264295 )
Norm@50keV : 5.998535E-03 ( -1.085810E-03 1.060436E-03) )
------------------------------------------------------------
Chi-Squared = 50.26295 using 59 PHA bins.
Reduced chi-squared = 0.8818061 for 57 degrees of freedom
Null hypothesis probability = 0.724
Photon flux (15-150 keV) in 1.000 sec: 0.868296 ( -0.126312 0.126325 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.51211e-08 ( -9.5287e-09 9.8816e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 48.140 sec. to 49.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.335040 ( -1.68411 1.20501 )
Epeak [keV] : 43.5268 ( -9.68106 18.1807 )
Norm@50keV : 4.973643E-02 ( -3.951731E-02 0.443874 )
------------------------------------------------------------
Chi-Squared = 44.77890 using 59 PHA bins.
Reduced chi-squared = 0.7996232 for 56 degrees of freedom
Null hypothesis probability = 0.859
Photon flux (15-150 keV) in 1.000 sec: 0.835079 ( -0.128077 0.12833 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.8958e-08 ( -9.4431e-09 1.04674e-08 ) ergs/cm2
Band function
Time interval is from 48.140 sec. to 49.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.352136 ( -1.18863 1.57172 )
beta : -9.34945 ( -0.650553 7.28244 )
Epeak [keV] : 43.5719 ( -9.05610 18.1714 )
Norm@50keV : 4.860378E-02 ( -9.483188E-03 0.479224 )
------------------------------------------------------------
Chi-Squared = 44.77938 using 59 PHA bins.
Reduced chi-squared = 0.8141705 for 55 degrees of freedom
Null hypothesis probability = 0.836
Photon flux (15-150 keV) in 1.000 sec: 0.834439 ( -0.118801 0.128988 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.88828e-08 ( -6.9596e-09 1.04941e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 16:34:42 EST 2007