batgrbproduct Analysis for Trigger=148522
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): Tue Jan 8 14:28:01 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger148522/SDC
======================================================================
Trigger: 00148522 Segment: 000
BAT Trigger Time: 144613681.728 [s; MET]
Trigger Stop: 144613682.24 [s; MET]
UTC: 2005-08-01T18:28:02.075720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 204.139119695272 Dec: -21.9501095764615 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.25
Image Trigger?: NO
Rate S/N Ratio: 19.672315572906 [ if not an image trigger ]
Image S/N Ratio: 10.25
Flight Position: [ source = BAT ]
RA: 204.139119695272 Dec: -21.9501095764615 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 204.14480142208 Dec: -21.9342134724728 [deg; J2000]
{ 13h 36m 34.8s , -21d 56' 03.2" }
+/- 1.57749244718064 [arcmin] (estimated 90% radius based on SNR)
+/- 0.655656173616861 [arcmin] (formal 1-sigma fit error)
SNR: 15.8601747352632
RA = 13h 36m 34.8s (204.144801 deg.)
Dec = -21d 56' 3" (-21.934213 deg.)
Angular difference between Flight and Ground position is 1.004818 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 19.4000000059605 +/- 6.1077082574253
Measured from: 0.188000023365021
to: 19.5880000293255 [s; relative to TRIGTIME]
T50: 6.91200000047684 +/- 5.20609182613997
Measured from: 0.880000025033951
to: 7.79200002551079 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0520000159740448
to: 1.05200001597404 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0520000159740448
to: 25.688000023365 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.217926 0.234469 0.090510 0.051554
0.024179 0.024265 0.021908 0.020755 [error]
Peak 0.045985 0.065555 0.055795 0.008969
0.005457 0.005693 0.005131 0.004260 [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 6.83e-08 9.31e-08 9.38e-08 1.71e-07 3.10e-07 4.23e-07 erg/cm2
Error 1.21e-08 1.15e-08 2.14e-08 7.83e-08 4.79e-08 1.01e-07 erg/cm2
Peak flux Power-law 4.38e-01 4.78e-01 3.71e-01 4.72e-01 1.46e+00 1.76e+00 ph/cm2/s
Error 7.41e-02 4.90e-02 4.17e-02 1.12e-01 1.38e-01 1.66e-01 ph/cm2/s
Fluence Cutoff-PL 6.82e-08 9.32e-08 9.38e-08 1.70e-07 3.10e-07 3.97e-07 erg/cm2
Error 1.21e-08 1.15e-08 2.14e-08 7.77e-08 4.79e-08 1.36e-07 erg/cm2
Peak flux Cutoff-PL 4.23e-01 4.86e-01 3.78e-01 3.80e-01 1.45e+00 1.67e+00 ph/cm2/s
Error 8.75e-02 5.57e-02 4.80e-02 1.93e-01 1.40e-01 2.44e-01 ph/cm2/s
Fluence Band 6.68e-08 9.43e-08 9.29e-08 1.61e-07 3.08e-07 4.13e-07 erg/cm2
Error 1.22e-08 1.37e-08 2.29e-08 1.11e-07 3.87e-08 1.33e-07 erg/cm2
Peak flux Band 4.30e-01 4.86e-01 3.70e-01 4.60e-01 1.46e+00 1.74e+00 ph/cm2/s
Error 7.67e-02 4.66e-02 4.03e-02 1.19e-01 1.40e-01 1.74e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.990 0.251 - - 1.31e-03 2.13e-04 58.854 57
CPL 2.021 0.000 21.2 0.0 1.25e-03 2.44e-03 58.828 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.366 0.162 - - 1.21e-02 1.12e-03 61.491 57
CPL 1.178 0.506 229.2 5000.0 1.50e-02 1.01e-02 61.202 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: 1.088000 sec.
T50 in the 50-300 keV band: 0.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 25.636 0.052 25.688
T90 19.400 0.188 19.588
T50 6.912 0.880 7.792
Peak 1.000 0.052 1.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
204.1448 -21.9342 0.0121 19.7 -176.2 0.4637 15.9 TRIG_00148522
------------------------------------------
Foreground time interval of the image:
0.052 9.973 (delta_t = 9.921 [sec])
Background time interval of the image:
-299.728 0.052 (delta_t = 299.780 [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 0.052 sec. to 25.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99035 ( -0.243324 0.259008 )
Norm@50keV : 1.312967E-03 ( -2.167338E-04 2.096394E-04) )
------------------------------------------------------------
Chi-Squared = 58.85387 using 59 PHA bins.
Reduced chi-squared = 1.032524 for 57 degrees of freedom
Null hypothesis probability = 0.407
Photon flux (15-150 keV) in 25.64 sec: 0.196076 ( -0.023924 0.023929 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10288e-07 ( -4.71032e-08 4.86852e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 25.688 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02050 ( )
Epeak [keV] : 21.2287 ( )
Norm@50keV : 1.248038E-03 ( -1.180529E-03 3.694588E-03) )
------------------------------------------------------------
Chi-Squared = 58.82843 using 59 PHA bins.
Reduced chi-squared = 1.050508 for 56 degrees of freedom
Null hypothesis probability = 0.372
Photon flux (15-150 keV) in 25.64 sec: 0.196006 ( -0.023917 0.02392 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10257e-07 ( -4.71032e-08 4.86801e-08 ) ergs/cm2
Band function
Time interval is from 0.052 sec. to 25.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45385 ( -8.54615 4.79134 )
beta : -2.01101 ( -7.98899 0.263877 )
Epeak [keV] : 25.2968 ( -25.1968 110.847 )
Norm@50keV : 3.328615E-03 ( -3.328615E-03 3364.42 )
------------------------------------------------------------
Chi-Squared = 58.85179 using 59 PHA bins.
Reduced chi-squared = 1.070032 for 55 degrees of freedom
Null hypothesis probability = 0.336
Photon flux (15-150 keV) in 25.64 sec: 0.195925 ( -0.023775 21.379 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07652e-07 ( -2.81194e-08 4.92288e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36561 ( -0.162698 0.162296 )
Norm@50keV : 1.211083E-02 ( -1.118526E-03 1.114786E-03) )
------------------------------------------------------------
Chi-Squared = 61.49062 using 59 PHA bins.
Reduced chi-squared = 1.078783 for 57 degrees of freedom
Null hypothesis probability = 0.318
Photon flux (15-150 keV) in 1.000 sec: 1.46377 ( -0.13751 0.13771 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17887e-07 ( -1.2079e-08 1.216e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17787 ( -0.672754 0.339157 )
Epeak [keV] : 229.173 ( -229.163 9770.83 )
Norm@50keV : 1.498440E-02 ( -3.890286E-03 1.628594E-02) )
------------------------------------------------------------
Chi-Squared = 61.20158 using 59 PHA bins.
Reduced chi-squared = 1.092885 for 56 degrees of freedom
Null hypothesis probability = 0.295
Photon flux (15-150 keV) in 1.000 sec: 1.45358 ( -0.14083 0.13968 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16667e-07 ( -1.2786e-08 1.2642e-08 ) ergs/cm2
Band function
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.923763 ( -9.07624 4.03756 )
beta : -1.38459 ( -8.61541 0.174883 )
Epeak [keV] : 68.2738 ( -68.1738 9814.61 )
Norm@50keV : 2.473768E-02 ( -31.2000 744.260 )
------------------------------------------------------------
Chi-Squared = 61.27223 using 59 PHA bins.
Reduced chi-squared = 1.114040 for 55 degrees of freedom
Null hypothesis probability = 0.261
Photon flux (15-150 keV) in 1.000 sec: 1.46104 ( -0.1445 0.13634 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16463e-07 ( -1.2906e-08 1.2867e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 14:42:20 EST 2008