batgrbproduct Analysis for Trigger=152652
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 18:48:39 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger152652/GCN5_download_cron
======================================================================
Trigger: 00152652 Segment: 000
BAT Trigger Time: 147067728 [s; MET]
Trigger Stop: 147067792 [s; MET]
UTC: 2005-08-30T04:08:48.298580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.042193013951 Dec: -45.2302998706547 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33539
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33539
Flight Position: [ source = BAT ]
RA: 252.042193013951 Dec: -45.2302998706547 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.087603176429 Dec: -45.1877647706378 [deg; J2000]
{ 16h 48m 21.0s , -45d 11' 16.0" }
+/- 3.69153541937453 [arcmin] (estimated 90% radius based on SNR)
+/- 2.71663670139018 [arcmin] (formal 1-sigma fit error)
SNR: 4.70784991226785
RA = 16h 48m 21.0s (252.087603 deg.)
Dec = -45d 11' 16" (-45.187765 deg.)
Angular difference between Flight and Ground position is 3.193417 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.267058 0.222223 0.006901 -0.021287
0.044593 0.041318 0.035225 0.030998 [error]
Peak 0.267058 0.222223 0.006901 -0.021287
0.044593 0.041318 0.035225 0.030998 [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 8.02e-08 7.57e-08 4.97e-08 5.06e-08 2.26e-07 2.56e-07 erg/cm2
Error 1.99e-08 1.99e-08 2.48e-08 4.69e-08 6.27e-08 8.90e-08 erg/cm2
Peak flux Power-law 4.19e-02 2.21e-02 7.26e-03 3.07e-03 7.30e-02 7.44e-02 ph/cm2/s
Error 1.06e-02 5.62e-03 3.51e-03 3.23e-03 1.61e-02 1.65e-02 ph/cm2/s
Fluence Cutoff-PL 7.48e-08 9.74e-08 3.40e-08 1.89e-09 2.08e-07 2.08e-07 erg/cm2
Error 2.27e-08 2.78e-08 3.32e-08 1.30e-08 5.39e-08 5.48e-08 erg/cm2
Peak flux Cutoff-PL 3.82e-02 2.84e-02 5.38e-03 1.64e-04 7.22e-02 7.22e-02 ph/cm2/s
Error 1.21e-02 7.82e-03 4.99e-03 9.38e-04 1.56e-02 1.57e-02 ph/cm2/s
Fluence Band 7.85e-08 9.60e-08 3.59e-08 2.43e-09 2.10e-07 2.11e-07 erg/cm2
Error 2.11e-08 1.89e-08 1.40e-08 2.02e-08 5.00e-08 5.10e-08 erg/cm2
Peak flux Band 3.67e-02 2.95e-02 4.39e-03 6.11e-05 7.07e-02 7.07e-02 ph/cm2/s
Error 1.26e-02 7.67e-03 3.77e-03 2.50e-04 1.50e-02 1.50e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.607 0.458 - - 3.48e-04 1.31e-04 70.148 57
CPL 0.222 2.384 26.2 17.8 1.18e-02 4.62e-01 65.562 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.607 0.458 - - 3.48e-04 1.31e-04 70.148 57
CPL 0.222 2.384 26.2 17.8 1.18e-02 4.62e-01 65.562 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.0876 -45.1878 0.0409 17.1 -121.5 0.3796 4.7 TRIG_00152652
------------------------------------------
Foreground time interval of the image:
0.000 19.134 (delta_t = 19.134 [sec])
20.000 64.000 (delta_t = 44.000 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 19.134300
20.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.60734 ( -0.415795 0.500907 )
Norm@50keV : 3.475043E-04 ( -1.288473E-04 1.327177E-04) )
------------------------------------------------------------
Chi-Squared = 70.14813 using 59 PHA bins.
Reduced chi-squared = 1.230669 for 57 degrees of freedom
Null hypothesis probability = 0.113
Photon flux (15-150 keV) in 63.13 sec: 7.300043E-02 ( -0.0160455 0.0160778 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26264e-07 ( -6.0346e-08 6.50978e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 19.134300
20.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.222027 ( -2.99741 1.77121 )
Epeak [keV] : 26.2084 ( -26.1984 9.45137 )
Norm@50keV : 1.177612E-02 ( -1.177612E-02 0.911237 )
------------------------------------------------------------
Chi-Squared = 65.56168 using 59 PHA bins.
Reduced chi-squared = 1.170744 for 56 degrees of freedom
Null hypothesis probability = 0.179
Photon flux (15-150 keV) in 63.13 sec: 7.219937E-02 ( -0.0156145 0.0156767 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08085e-07 ( -5.0706e-08 5.71434e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 19.134300
20.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.744447 ( -7.02628 1.85994 )
beta : -9.34459 ( -0.655408 19.3445 )
Epeak [keV] : 22.8249 ( -15.4953 11.5944 )
Norm@50keV : 5.852227E-03 ( -2.184815E-03 0.515614 )
------------------------------------------------------------
Chi-Squared = 65.75161 using 59 PHA bins.
Reduced chi-squared = 1.195484 for 55 degrees of freedom
Null hypothesis probability = 0.152
Photon flux (15-150 keV) in 63.13 sec: 7.071128E-02 ( -0.0149164 0.0150497 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09786e-07 ( -5.20261e-08 4.79725e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 20.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.60734 ( -0.415795 0.500907 )
Norm@50keV : 3.475043E-04 ( -1.288473E-04 1.327177E-04) )
------------------------------------------------------------
Chi-Squared = 70.14813 using 59 PHA bins.
Reduced chi-squared = 1.230669 for 57 degrees of freedom
Null hypothesis probability = 0.113
Photon flux (15-150 keV) in 63.13 sec: 7.300043E-02 ( -0.0160455 0.0160778 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26264e-07 ( -6.0346e-08 6.50978e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.222027 ( -2.99741 1.77121 )
Epeak [keV] : 26.2084 ( -26.1984 9.45137 )
Norm@50keV : 1.177612E-02 ( -1.177612E-02 0.911237 )
------------------------------------------------------------
Chi-Squared = 65.56168 using 59 PHA bins.
Reduced chi-squared = 1.170744 for 56 degrees of freedom
Null hypothesis probability = 0.179
Photon flux (15-150 keV) in 63.13 sec: 7.219937E-02 ( -0.0156145 0.0156767 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08085e-07 ( -5.0706e-08 5.71434e-08 ) ergs/cm2
Band function
Time interval is from 20.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.744447 ( -7.41638 1.85994 )
beta : -9.34459 ( -0.655408 19.3445 )
Epeak [keV] : 22.8249 ( -22.7249 11.5944 )
Norm@50keV : 5.852227E-03 ( -2.184815E-03 0.515614 )
------------------------------------------------------------
Chi-Squared = 65.75161 using 59 PHA bins.
Reduced chi-squared = 1.195484 for 55 degrees of freedom
Null hypothesis probability = 0.152
Photon flux (15-150 keV) in 63.13 sec: 7.071128E-02 ( -0.0149164 0.0150497 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09786e-07 ( -5.20261e-08 4.79725e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 19:00:24 EST 2008