batgrbproduct Analysis for Trigger=202442
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): Mon Dec 31 15:00:28 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger202442/SDC
======================================================================
Trigger: 00202442 Segment: 000
BAT Trigger Time: 164761222.208 [s; MET]
Trigger Stop: 164761223.232 [s; MET]
UTC: 2006-03-22T23:00:21.120860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.244501992693 Dec: -36.6974174803287 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.93
Image Trigger?: NO
Rate S/N Ratio: 12.6491106406735 [ if not an image trigger ]
Image S/N Ratio: 6.93
Flight Position: [ source = BAT ]
RA: 274.244501992693 Dec: -36.6974174803287 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.232513884341 Dec: -36.7089853798258 [deg; J2000]
{ 18h 16m 55.8s , -36d 42' 32.3" }
+/- 1.08341347954291 [arcmin] (estimated 90% radius based on SNR)
+/- 0.357192259072513 [arcmin] (formal 1-sigma fit error)
SNR: 27.1276598015886
RA = 18h 16m 55.8s (274.232514 deg.)
Dec = -36d 42' 32" (-36.708985 deg.)
Angular difference between Flight and Ground position is 0.902386 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 221.488000035286 +/- 23.9916372144022
Measured from: -19.6120000183582
to: 201.876000016928 [s; relative to TRIGTIME]
T50: 170.908000022173 +/- 3.60379579008613
Measured from: 15.1839999854565
to: 186.092000007629 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 182.187999993563
to: 183.187999993563 [s; relative to TRIGTIME]
Total Fluence
Measured from: -51.6240000128746
to: 248.203999996185 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.280497 3.388941 2.310496 0.495935
0.122683 0.109637 0.093639 0.079996 [error]
Peak 0.064646 0.096969 0.066935 0.013800
0.007929 0.007574 0.006689 0.004828 [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 7.89e-07 1.38e-06 1.85e-06 5.09e-06 5.39e-06 9.12e-06 erg/cm2
Error 6.14e-08 6.27e-08 9.41e-08 5.82e-07 2.28e-07 6.37e-07 erg/cm2
Peak flux Power-law 7.34e-01 6.95e-01 4.57e-01 4.65e-01 2.08e+00 2.35e+00 ph/cm2/s
Error 1.16e-01 6.77e-02 5.40e-02 1.12e-01 1.96e-01 2.15e-01 ph/cm2/s
Fluence Cutoff-PL 7.15e-07 1.43e-06 1.92e-06 2.77e-06 5.22e-06 6.86e-06 erg/cm2
Error 7.63e-08 7.20e-08 1.06e-07 1.07e-06 2.56e-07 1.09e-06 erg/cm2
Peak flux Cutoff-PL 6.38e-01 7.40e-01 4.86e-01 2.29e-01 2.01e+00 2.09e+00 ph/cm2/s
Error 1.41e-01 8.12e-02 6.36e-02 1.56e-01 2.05e-01 2.59e-01 ph/cm2/s
Fluence Band 6.61e-07 1.48e-06 1.83e-06 4.30e-06 5.22e-06 8.35e-06 erg/cm2
Error 8.57e-08 8.33e-08 9.37e-08 7.05e-07 2.43e-07 7.39e-07 erg/cm2
Peak flux Band 6.38e-01 7.39e-01 4.86e-01 2.29e-01 2.01e+00 2.09e+00 ph/cm2/s
Error 1.41e-01 8.13e-02 6.36e-02 1.55e-01 2.05e-01 2.59e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.577 0.075 - - 1.92e-03 7.73e-05 64.632 57
CPL 1.061 0.323 95.5 53.7 3.38e-03 1.15e-03 57.540 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.605 0.160 - - 1.61e-02 1.52e-03 50.337 57
CPL 0.869 0.712 77.9 93.3 3.76e-02 3.58e-02 46.533 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: 213.824000 sec.
T50 in the 50-300 keV band: 171.200000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 299.828 -51.624 248.204
T90 221.488 -19.612 201.876
T50 170.908 15.184 186.092
Peak 1.000 182.188 183.188
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.2325 -36.7090 0.0071 30.6 -15.2 9.1084 27.1 TRIG_00202442
------------------------------------------
Foreground time interval of the image:
-51.624 248.204 (delta_t = 299.828 [sec])
Background time interval of the image:
-239.208 -51.624 (delta_t = 187.584 [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 -51.624 sec. to 248.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57697 ( -7.520080E-02 7.510996E-02) )
Norm@50keV : 1.916858E-03 ( -7.730792E-05 7.726578E-05) )
------------------------------------------------------------
Chi-Squared = 64.63207 using 59 PHA bins.
Reduced chi-squared = 1.133896 for 57 degrees of freedom
Null hypothesis probability = 0.228
Photon flux (15-150 keV) in 299.8 sec: 0.244598 ( -0.01082 0.010864 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38962e-06 ( -2.27698e-07 2.29227e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -51.624 sec. to 248.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06119 ( -0.291195 0.354859 )
Epeak [keV] : 95.5335 ( -17.4759 89.9431 )
Norm@50keV : 3.376896E-03 ( -1.067179E-03 1.241717E-03) )
------------------------------------------------------------
Chi-Squared = 57.53988 using 59 PHA bins.
Reduced chi-squared = 1.027498 for 56 degrees of freedom
Null hypothesis probability = 0.418
Photon flux (15-150 keV) in 299.8 sec: 0.237281 ( -0.01171 0.011753 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22237e-06 ( -2.58158e-07 2.5441e-07 ) ergs/cm2
Band function
Time interval is from -51.624 sec. to 248.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.735353 ( -0.583385 3.82287 )
beta : -1.76086 ( -8.23914 0.154970 )
Epeak [keV] : 63.2679 ( -35.8977 85.3545 )
Norm@50keV : 5.558970E-03 ( -1.865937E-02 10.4750 )
------------------------------------------------------------
Chi-Squared = 56.42484 using 59 PHA bins.
Reduced chi-squared = 1.025906 for 55 degrees of freedom
Null hypothesis probability = 0.421
Photon flux (15-150 keV) in 299.8 sec: 0.234433 ( -0.012351 0.010582 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.21865e-06 ( -2.49374e-07 2.37532e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 182.188 sec. to 183.188 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60535 ( -0.158585 0.161301 )
Norm@50keV : 1.612898E-02 ( -1.525240E-03 1.516737E-03) )
------------------------------------------------------------
Chi-Squared = 50.33721 using 59 PHA bins.
Reduced chi-squared = 0.8831089 for 57 degrees of freedom
Null hypothesis probability = 0.721
Photon flux (15-150 keV) in 1.000 sec: 2.07610 ( -0.19603 0.19653 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50694e-07 ( -1.5092e-08 1.5303e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 182.188 sec. to 183.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.868574 ( -0.773117 0.651414 )
Epeak [keV] : 77.9358 ( -18.8975 167.789 )
Norm@50keV : 3.758504E-02 ( -1.945887E-02 5.206729E-02) )
------------------------------------------------------------
Chi-Squared = 46.53325 using 59 PHA bins.
Reduced chi-squared = 0.8309509 for 56 degrees of freedom
Null hypothesis probability = 0.812
Photon flux (15-150 keV) in 1.000 sec: 2.00910 ( -0.20498 0.20516 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44627e-07 ( -1.6674e-08 1.6272e-08 ) ergs/cm2
Band function
Time interval is from 182.188 sec. to 183.188 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.868512 ( -0.651526 0.774007 )
beta : -9.11986 ( -0.880136 7.49314 )
Epeak [keV] : 77.8953 ( -18.8710 169.031 )
Norm@50keV : 3.759421E-02 ( -1.946092E-02 5.222082E-02) )
------------------------------------------------------------
Chi-Squared = 46.53330 using 59 PHA bins.
Reduced chi-squared = 0.8460600 for 55 degrees of freedom
Null hypothesis probability = 0.785
Photon flux (15-150 keV) in 1.000 sec: 2.00934 ( -0.20522 0.20493 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44343e-07 ( -1.6511e-08 1.6414e-08 ) ergs/cm2
Plot creation:
Mon Dec 31 15:22:31 EST 2007