batgrbproduct Analysis for Trigger=261299
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): Thu Dec 13 14:31:44 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger261299/GCN5_download_cron
======================================================================
Trigger: 00261299 Segment: 000
BAT Trigger Time: 193639474.688 [s; MET]
Trigger Stop: 193639475.712 [s; MET]
UTC: 2007-02-20T04:44:32.912080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 34.8193073293135 Dec: 68.8182975953661 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.51
Image Trigger?: NO
Rate S/N Ratio: 20.8326666559997 [ if not an image trigger ]
Image S/N Ratio: 10.51
Flight Position: [ source = BAT ]
RA: 34.8193073293135 Dec: 68.8182975953661 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 34.7966461173086 Dec: 68.8031039160298 [deg; J2000]
{ 02h 19m 11.2s , +68d 48' 11.2" }
+/- 0.677610919199762 [arcmin] (estimated 90% radius based on SNR)
+/- 0.173722926959066 [arcmin] (formal 1-sigma fit error)
SNR: 53.0365123687117
RA = 2h 19m 11.2s (34.796646 deg.)
Dec = 68d 48' 11" (68.803104 deg.)
Angular difference between Flight and Ground position is 1.035654 arcmin
Partial Coding Fraction: 0.640625 [ including projection effects ]
Duration
T90: 129.180000007153 +/- 19.1590526768142
Measured from: -1.32400000095367
to: 127.856000006199 [s; relative to TRIGTIME]
T50: 35.0080000162125 +/- 1.49728820392928
Measured from: 8.95600000023842
to: 43.9640000164509 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.8600000143051
to: 12.8600000143051 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.1200000047684
to: 239.788000017405 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.096122 5.678223 4.809678 1.448586
0.089091 0.092216 0.085993 0.081878 [error]
Peak 0.154250 0.243988 0.244915 0.071355
0.009031 0.010372 0.010650 0.008913 [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 1.35e-06 2.55e-06 3.73e-06 1.16e-05 1.06e-05 1.92e-05 erg/cm2
Error 6.80e-08 7.24e-08 9.36e-08 7.20e-07 2.34e-07 7.43e-07 erg/cm2
Peak flux Power-law 1.54e+00 1.86e+00 1.63e+00 2.44e+00 5.88e+00 7.46e+00 ph/cm2/s
Error 1.47e-01 1.06e-01 8.42e-02 2.75e-01 2.86e-01 3.57e-01 ph/cm2/s
Fluence Cutoff-PL 1.29e-06 2.56e-06 3.79e-06 9.72e-06 1.05e-05 1.73e-05 erg/cm2
Error 9.49e-08 7.39e-08 1.14e-07 2.02e-06 2.56e-07 2.03e-06 erg/cm2
Peak flux Cutoff-PL 1.43e+00 1.89e+00 1.69e+00 1.85e+00 5.81e+00 6.86e+00 ph/cm2/s
Error 1.90e-01 1.14e-01 1.09e-01 5.44e-01 2.95e-01 6.79e-01 ph/cm2/s
Fluence Band 1.32e-06 2.56e-06 3.72e-06 9.76e-06 1.05e-05 1.91e-05 erg/cm2
Error 1.03e-07 7.44e-08 8.67e-08 2.57e-07 7.36e-07 0.00e+00 erg/cm2
Peak flux Band 1.42e+00 1.89e+00 1.68e+00 2.03e+00 5.80e+00 7.05e+00 ph/cm2/s
Error 1.95e-01 1.20e-01 1.13e-01 7.30e-01 2.95e-01 6.11e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.453 0.044 - - 4.30e-03 9.49e-05 42.895 57
CPL 1.276 0.183 243.2 4922.9 5.10e-03 8.50e-04 40.817 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.194 0.083 - - 5.01e-02 2.31e-03 43.070 57
CPL 0.914 0.342 223.3 4936.1 6.69e-02 2.38e-02 40.931 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: 160.832000 sec.
T50 in the 50-300 keV band: 33.024000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 256.908 -17.120 239.788
T90 129.180 -1.324 127.856
T50 35.008 8.956 43.964
Peak 1.000 11.860 12.860
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
34.7966 +68.8031 0.0036 38.5 -167.9 4.7506 53.0 TRIG_00261299
------------------------------------------
Foreground time interval of the image:
-17.120 10.313 (delta_t = 27.433 [sec])
Background time interval of the image:
-239.688 -17.120 (delta_t = 222.568 [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 -17.120 sec. to 239.788 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45338 ( -4.450524E-02 4.443252E-02) )
Norm@50keV : 4.299021E-03 ( -9.492924E-05 9.483099E-05) )
------------------------------------------------------------
Chi-Squared = 42.89532 using 59 PHA bins.
Reduced chi-squared = 0.7525494 for 57 degrees of freedom
Null hypothesis probability = 0.917
Photon flux (15-150 keV) in 256.9 sec: 0.530241 ( -0.013937 0.014016 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0562e-05 ( -2.33985e-07 2.34062e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.120 sec. to 239.788 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.27650 ( -0.168283 0.197410 )
Epeak [keV] : 243.228 ( -89.0992 9756.77 )
Norm@50keV : 5.100837E-03 ( -8.278857E-04 8.718525E-04) )
------------------------------------------------------------
Chi-Squared = 40.81709 using 59 PHA bins.
but latest trial 1.47196 gives Chi-Squared = 3.68344
but latest trial 4.332143E-03 gives Chi-Squared = 2.09752
Reduced chi-squared = 0.7288767 for 56 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 256.9 sec: 0.522651 ( -0.01622 0.008202 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04772e-05 ( -2.57208e-07 2.55076e-07 ) ergs/cm2
Band function
Time interval is from -17.120 sec. to 239.788 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08626 ( -8.91374 2.96260 )
beta : -1.45669 ( -8.07906 0.489416 )
Epeak [keV] : 65.1562 ( -127.628 9717.90 )
Norm@50keV : 7.895288E-03 ( -5.479995E-04 8.59664 )
------------------------------------------------------------
Chi-Squared = 42.68131 using 59 PHA bins.
Reduced chi-squared = 0.7760238 for 55 degrees of freedom
Null hypothesis probability = 0.887
Photon flux (15-150 keV) in 256.9 sec: 0.522649 ( -0.016229 0.016362 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04683e-05 ( -2.59109e-07 2.55025e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 11.860 sec. to 12.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19397 ( -8.332169E-02 8.285904E-02) )
Norm@50keV : 5.014394E-02 ( -2.315562E-03 2.313800E-03) )
------------------------------------------------------------
Chi-Squared = 43.06982 using 59 PHA bins.
Reduced chi-squared = 0.7556109 for 57 degrees of freedom
Null hypothesis probability = 0.914
Photon flux (15-150 keV) in 1.000 sec: 5.88090 ( -0.28546 0.28599 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0964e-07 ( -2.5367e-08 2.5418e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.860 sec. to 12.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.914408 ( -0.369436 0.315310 )
Epeak [keV] : 223.264 ( -95.4303 9776.74 )
Norm@50keV : 6.692624E-02 ( -1.765887E-02 3.003105E-02) )
------------------------------------------------------------
Chi-Squared = 40.93084 using 59 PHA bins.
Reduced chi-squared = 0.7309079 for 56 degrees of freedom
Null hypothesis probability = 0.935
Photon flux (15-150 keV) in 1.000 sec: 5.81090 ( -0.29312 0.29648 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04533e-07 ( -2.6706e-08 2.6376e-08 ) ergs/cm2
Band function
Time interval is from 11.860 sec. to 12.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.871138 ( -9.12886 0.657696 )
beta : -1.48857 ( -8.51143 0.336558 )
Epeak [keV] : 195.524 ( -195.424 9804.48 )
Norm@50keV : 7.039363E-02 ( -2.100442E-02 2871.26 )
------------------------------------------------------------
Chi-Squared = 40.82315 using 59 PHA bins.
Reduced chi-squared = 0.7422391 for 55 degrees of freedom
Null hypothesis probability = 0.923
Photon flux (15-150 keV) in 1.000 sec: 5.79841 ( -0.28634 0.30343 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04177e-07 ( -2.6675e-08 2.6378e-08 ) ergs/cm2
Plot creation:
Thu Dec 13 14:51:03 EST 2007