batgrbproduct Analysis for Trigger=155764
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): Wed Jan 9 12:20:25 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger155764/GCN5_download_cron
======================================================================
Trigger: 00155764 Segment: 000
BAT Trigger Time: 148765332.448 [s; MET]
Trigger Stop: 148765332.832 [s; MET]
UTC: 2005-09-18T19:42:12.711840 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 75.0981843685191 Dec: -13.3207855860069 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33415
Image Trigger?: NO
Rate S/N Ratio: 6.40312423743285 [ if not an image trigger ]
Image S/N Ratio: 33415
Flight Position: [ source = BAT ]
RA: 75.0981843685191 Dec: -13.3207855860069 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 75.3078497196333 Dec: -13.1472065898821 [deg; J2000]
{ 05h 01m 13.9s , -13d 08' 49.9" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 6.92412728533498 [arcmin] (formal 1-sigma fit error)
SNR: -1.25887624110308
RA = 5h 1m 13.9s (75.307850 deg.)
Dec = -13d 8' 50" (-13.147207 deg.)
Angular difference between Flight and Ground position is 16.075672 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
T50: 0.38400000333786 +/-
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.38400000333786 second)
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.38400000333786 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.000975 0.004007 -0.000370 -0.000706
0.002823 0.002908 0.002382 0.002136 [error]
Peak -0.000975 0.004007 -0.000370 -0.000706
0.002823 0.002908 0.002382 0.002136 [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 4.00e-10 4.91e-10 4.35e-10 6.75e-10 1.56e-09 1.96e-09 erg/cm2
Error 7.60e-10 8.27e-10 1.21e-09 3.97e-08 3.30e-09 4.01e-08 erg/cm2
Peak flux Power-law 3.41e-02 2.32e-02 1.03e-02 6.42e-03 7.06e-02 7.39e-02 ph/cm2/s
Error 6.57e-02 3.92e-02 2.74e-02 2.46e-01 1.20e-01 2.35e-01 ph/cm2/s
Fluence Cutoff-PL 4.70e-10 1.14e-09 3.96e-10 6.38e-12 1.99e-09 1.97e-09 erg/cm2
Error 7.51e-10 1.43e-09 1.26e-09 3.59e-08 2.62e-09 2.63e-09 erg/cm2
Peak flux Cutoff-PL 3.85e-02 5.33e-02 1.05e-02 9.21e-05 1.01e-01 9.98e-02 ph/cm2/s
Error 6.32e-02 6.64e-02 3.02e-02 2.18e-01 1.26e-01 1.26e-01 ph/cm2/s
Fluence Band 4.06e-10 1.24e-09 4.51e-10 8.48e-12 2.12e-09 8.63e-10 erg/cm2
Error 4.84e-10 1.53e-09 7.58e-10 4.62e-08 3.06e-09 3.48e-08 erg/cm2
Peak flux Band 3.39e-02 4.74e-02 1.38e-02 4.06e-04 9.56e-02 9.50e-02 ph/cm2/s
Error 4.89e-02 6.18e-02 3.14e-02 1.09e-01 1.24e-01 1.36e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.172 6.500 - - 4.33e-04 8.83e-04 66.049 57
CPL -2.500 0.000 37.1 5000.0 4.10e-01 5.00e+23 65.296 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.172 6.500 - - 4.33e-04 8.83e-04 66.049 57
CPL -2.500 0.000 37.1 5000.0 4.10e-01 5.00e+23 65.296 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 0.384 0.000 0.384
T90 0.384 0.000 0.384
T50 0.384 0.000 0.384
Peak 0.384 0.000 0.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
75.3078 -13.1472 0.1527 16.1 150.8 -0.0066 -1.3 TRIG_00155764
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-119.480 -116.515 (delta_t = 2.965 [sec])
-60.480 -31.557 (delta_t = 28.923 [sec])
-30.480 -4.480 (delta_t = 26.000 [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 -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17165 ( -5.17165 7.82835 )
Norm@50keV : 4.327528E-04 ( -4.327528E-04 1.334228E-03) )
------------------------------------------------------------
Chi-Squared = 66.04933 using 59 PHA bins.
Reduced chi-squared = 1.158760 for 57 degrees of freedom
Null hypothesis probability = 0.193
Photon flux (15-150 keV) in 0.3840 sec: 7.061865E-02 ( -0.0706187 0.168682 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56369e-09 ( -1.56369e-09 5.03432e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49983 ( )
Epeak [keV] : 37.1311 ( -36.7927 9963.20 )
Norm@50keV : 0.410175 ( -0.843199 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 65.29557 using 59 PHA bins.
Reduced chi-squared = 1.165992 for 56 degrees of freedom
Null hypothesis probability = 0.185
Photon flux (15-150 keV) in 0.3840 sec: 0.101300 ( -0.1013 0.150346 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9919e-09 ( -1.9919e-09 3.24433e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.590291 ( -14.9747 2.530718E-02) )
beta : -9.35146 ( -0.632767 19.3672 )
Epeak [keV] : 35.9603 ( -35.8600 9964.04 )
Norm@50keV : 2.722384E-02 ( -15.7909 2.701951E+07) )
------------------------------------------------------------
Chi-Squared = 65.59351 using 59 PHA bins.
Reduced chi-squared = 1.192609 for 55 degrees of freedom
Null hypothesis probability = 0.155
Photon flux (15-150 keV) in 0.3840 sec: 9.561935E-02 ( -0.0956194 0.15324 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1178e-09 ( -2.1178e-09 3.99456e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17165 ( -5.17165 7.82835 )
Norm@50keV : 4.327528E-04 ( -4.327528E-04 1.334228E-03) )
------------------------------------------------------------
Chi-Squared = 66.04933 using 59 PHA bins.
Reduced chi-squared = 1.158760 for 57 degrees of freedom
Null hypothesis probability = 0.193
Photon flux (15-150 keV) in 0.3840 sec: 7.061865E-02 ( -0.0706187 0.168682 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56369e-09 ( -1.56369e-09 5.03432e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49983 ( )
Epeak [keV] : 37.1311 ( -36.7927 9963.20 )
Norm@50keV : 0.410175 ( -0.843199 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 65.29557 using 59 PHA bins.
Reduced chi-squared = 1.165992 for 56 degrees of freedom
Null hypothesis probability = 0.185
Photon flux (15-150 keV) in 0.3840 sec: 0.101300 ( -0.1013 0.150346 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9919e-09 ( -1.9919e-09 3.24433e-09 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 0.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.590291 ( -14.9747 2.530718E-02) )
beta : -9.35146 ( -0.632767 19.3672 )
Epeak [keV] : 35.9603 ( -35.8600 9964.04 )
Norm@50keV : 2.722384E-02 ( -15.7909 2.701951E+07) )
------------------------------------------------------------
Chi-Squared = 65.59351 using 59 PHA bins.
Reduced chi-squared = 1.192609 for 55 degrees of freedom
Null hypothesis probability = 0.155
Photon flux (15-150 keV) in 0.3840 sec: 9.561935E-02 ( -0.0956194 0.15324 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1178e-09 ( -2.1178e-09 3.99456e-09 ) ergs/cm2
Plot creation:
Wed Jan 9 12:29:59 EST 2008