batgrbproduct Analysis for Trigger=146731
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 Jan 7 16:48:18 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger146731/GCN5_download_cron
======================================================================
Trigger: 00146731 Segment: 000
BAT Trigger Time: 143474332.448 [s; MET]
Trigger Stop: 143474332.832 [s; MET]
UTC: 2005-07-19T13:58:52.818200 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 213.419620393693 Dec: 9.44402520171992 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33392
Image Trigger?: NO
Rate S/N Ratio: 8.66025403784439 [ if not an image trigger ]
Image S/N Ratio: 33392
Flight Position: [ source = BAT ]
RA: 213.419620393693 Dec: 9.44402520171992 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 213.436547626248 Dec: 9.40020756139016 [deg; J2000]
{ 14h 13m 44.8s , +09d 24' 00.7" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 4.19827387530162 [arcmin] (formal 1-sigma fit error)
SNR: -2.20704378501109
RA = 14h 13m 44.8s (213.436548 deg.)
Dec = 9d 24' 1" (9.400208 deg.)
Angular difference between Flight and Ground position is 2.813506 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 -0.003941 0.000287 0.001136 -0.003399
0.002812 0.002696 0.002371 0.002125 [error]
Peak -0.003941 0.000287 0.001136 -0.003399
0.002812 0.002696 0.002371 0.002125 [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 2.84e-10 6.30e-12 3.49e-14 1.94e-16 2.93e-10 0.00e+00 erg/cm2
Error 5.10e-10 4.12e-10 8.37e-10 3.79e-08 2.55e-09 0.00e+00 erg/cm2
Peak flux Power-law 0.00e+00 3.62e-04 1.00e-06 2.78e-09 2.80e-02 0.00e+00 ph/cm2/s
Error 1.89e-02 1.68e-02 2.00e-01 5.77e-02 2.86e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 7.49e-13 4.56e-23 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 3.08e-10 1.92e+11 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 0.00e+00 3.62e-04 9.97e-07 2.74e-09 2.79e-02 0.00e+00 ph/cm2/s
Error 1.59e-02 1.93e-02 2.73e-01 5.77e-02 3.13e-01 0.00e+00 ph/cm2/s
Fluence Band 2.77e-10 6.64e-12 4.07e-14 2.50e-16 2.84e-10 0.00e+00 erg/cm2
Error 4.70e-10 1.12e-11 6.89e-14 4.23e-16 4.82e-10 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 3.85e-04 1.17e-06 3.55e-09 2.78e-02 0.00e+00 ph/cm2/s
Error 1.94e-02 4.49e-06 7.73e-01 5.81e-02 8.48e-02 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 6.500 - - 0.00e+00 5.63e-04 60.497 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 6.54e-02 60.497 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 6.500 - - 0.00e+00 5.63e-04 60.497 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 6.54e-02 60.497 0
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
213.4365 +9.4002 0.0872 24.9 -22.5 -0.0116 -2.2 TRIG_00146731
------------------------------------------
Foreground time interval of the image:
-0.032 0.352 (delta_t = 0.384 [sec])
Background time interval of the image:
-60.480 -4.480 (delta_t = 56.000 [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: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 1.125795E-03) )
------------------------------------------------------------
Chi-Squared = 60.49740 using 59 PHA bins.
Reduced chi-squared = 1.061358 for 57 degrees of freedom
Null hypothesis probability = 0.351
Photon flux (15-150 keV) in 0.3840 sec: 2.802398E-02 ( -0.028024 0.087447 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93083e-10 ( -2.93083e-10 4.80937e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( 0.00000 0.130785 )
------------------------------------------------------------
Chi-Squared = 60.49740 using 59 PHA bins.
but latest trial 0.255077 gives Chi-Squared = 2.73672
Reduced chi-squared = 1.080311 for 56 degrees of freedom
Null hypothesis probability = 0.317
Photon flux (15-150 keV) in 0.3840 sec: 2.794289E-02 ( -0.0279429 0.0875051 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( 0.00000 2.210732E-02) )
------------------------------------------------------------
Chi-Squared = 60.49740 using 59 PHA bins.
Reduced chi-squared = 1.099953 for 55 degrees of freedom
Null hypothesis probability = 0.284
Photon flux (15-150 keV) in 0.3840 sec: 2.776790E-02 ( -0.0277679 0.0884751 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84367e-10 ( -2.84367e-10 6.78943e-10 ) 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: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 1.125795E-03) )
------------------------------------------------------------
Chi-Squared = 60.49740 using 59 PHA bins.
Reduced chi-squared = 1.061358 for 57 degrees of freedom
Null hypothesis probability = 0.351
Photon flux (15-150 keV) in 0.3840 sec: 2.802398E-02 ( -0.028024 0.087447 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93083e-10 ( -2.93083e-10 4.80937e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 0.352 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( 0.00000 0.130785 )
------------------------------------------------------------
Chi-Squared = 60.49740 using 59 PHA bins.
but latest trial 0.255077 gives Chi-Squared = 2.73672
Reduced chi-squared = 1.080311 for 56 degrees of freedom
Null hypothesis probability = 0.317
Photon flux (15-150 keV) in 0.3840 sec: 2.794289E-02 ( -0.0279429 0.0875051 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( 0.00000 2.210732E-02) )
------------------------------------------------------------
Chi-Squared = 60.49740 using 59 PHA bins.
Reduced chi-squared = 1.099953 for 55 degrees of freedom
Null hypothesis probability = 0.284
Photon flux (15-150 keV) in 0.3840 sec: 2.776790E-02 ( -0.0277679 0.0884751 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84367e-10 ( -2.84367e-10 6.78943e-10 ) ergs/cm2
Plot creation:
Mon Jan 7 16:57:08 EST 2008