batgrbproduct Analysis for Trigger=292887
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): Fri Dec 14 16:48:01 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger292887/GCN5_download_cron
======================================================================
Trigger: 00292887 Segment: 000
BAT Trigger Time: 213031648 [s; MET]
Trigger Stop: 213031712 [s; MET]
UTC: 2007-10-02T15:27:25.735940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.292131087849 Dec: -13.8671288098478 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.2
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 20.2
Flight Position: [ source = BAT ]
RA: 244.292131087849 Dec: -13.8671288098478 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.295592847529 Dec: -13.8601146929981 [deg; J2000]
{ 16h 17m 10.9s , -13d 51' 36.4" }
+/- 1.28912596504426 [arcmin] (estimated 90% radius based on SNR)
+/- 0.44338146460462 [arcmin] (formal 1-sigma fit error)
SNR: 21.1618477682735
RA = 16h 17m 10.9s (244.295593 deg.)
Dec = -13d 51' 36" (-13.860115 deg.)
Angular difference between Flight and Ground position is 0.466666 arcmin
Partial Coding Fraction: 0.7109375 [ 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 1.727040 0.160302 0.024183 -0.003809
0.053277 0.047213 0.039765 0.034723 [error]
Peak 1.727040 0.160302 0.024183 -0.003809
0.053277 0.047213 0.039765 0.034723 [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 5.75e-07 8.26e-08 5.37e-09 3.70e-10 6.63e-07 6.63e-07 erg/cm2
Error 6.88e-08 2.21e-08 3.50e-09 4.32e-10 7.32e-08 7.32e-08 erg/cm2
Peak flux Power-law 3.16e-01 2.66e-02 8.64e-04 2.90e-05 3.44e-01 3.44e-01 ph/cm2/s
Error 3.91e-02 6.77e-03 5.50e-04 3.78e-05 3.95e-02 3.95e-02 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 5.68e-07 8.25e-08 5.30e-09 3.40e-10 6.67e-07 5.21e-07 erg/cm2
Error 6.42e-08 1.68e-08 7.36e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 3.20e-01 2.10e-02 2.49e-04 3.00e-06 3.42e-01 3.41e-01 ph/cm2/s
Error 4.17e-02 5.80e-03 4.38e-04 3.35e-05 4.17e-02 4.09e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.950 0.539 - - 8.79e-05 4.67e-05 48.912 57
CPL 1.757 0.000 1.2 0.0 2.72e-01 0.00e+00 47.705 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.950 0.539 - - 8.79e-05 4.67e-05 48.912 57
CPL 1.757 0.000 1.2 0.0 2.72e-01 0.00e+00 47.705 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
244.2956 -13.8601 0.0090 25.5 -53.3 1.9801 21.2 TRIG_00292887
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.95001 ( -0.531773 0.545636 )
Norm@50keV : 8.788488E-05 ( -3.684956E-05 5.651668E-05) )
------------------------------------------------------------
Chi-Squared = 48.91225 using 59 PHA bins.
Reduced chi-squared = 0.8581097 for 57 degrees of freedom
Null hypothesis probability = 0.768
Photon flux (15-150 keV) in 64.00 sec: 0.343860 ( -0.039481 0.039526 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.62829e-07 ( -7.32275e-08 7.32416e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75700 ( )
Epeak [keV] : 1.18379 ( )
Norm@50keV : 0.271561 ( )
------------------------------------------------------------
Chi-Squared = 47.70482 using 59 PHA bins.
Reduced chi-squared = 0.8518718 for 56 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.13935 ( -0.860647 4.21118 )
beta : -5.94438 ( -0.550690 0.526746 )
Epeak [keV] : 285.273 ( -285.173 9714.73 )
Norm@50keV : 1.200831E-02 ( -5.071331E-03 7.617493E-03) )
------------------------------------------------------------
Chi-Squared = 48.91195 using 59 PHA bins.
Reduced chi-squared = 0.8893081 for 55 degrees of freedom
Null hypothesis probability = 0.705
Photon flux (15-150 keV) in 64.00 sec: 0.341875 ( -0.04108 0.042275 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.66822e-07 ( -7.36339e-08 7.35232e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.95001 ( -0.531773 0.545636 )
Norm@50keV : 8.788488E-05 ( -3.684956E-05 5.651668E-05) )
------------------------------------------------------------
Chi-Squared = 48.91225 using 59 PHA bins.
Reduced chi-squared = 0.8581097 for 57 degrees of freedom
Null hypothesis probability = 0.768
Photon flux (15-150 keV) in 64.00 sec: 0.343860 ( -0.039481 0.039526 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.62829e-07 ( -7.32275e-08 7.32416e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75700 ( )
Epeak [keV] : 1.18379 ( )
Norm@50keV : 0.271561 ( )
------------------------------------------------------------
Chi-Squared = 47.70482 using 59 PHA bins.
Reduced chi-squared = 0.8518718 for 56 degrees of freedom
Null hypothesis probability = 0.777
Photon flux (15-150 keV) in 64.00 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.13935 ( -0.860647 4.21118 )
beta : -5.94438 ( -0.550690 0.526746 )
Epeak [keV] : 285.273 ( -285.173 9714.73 )
Norm@50keV : 1.200831E-02 ( -5.071331E-03 7.617493E-03) )
------------------------------------------------------------
Chi-Squared = 48.91195 using 59 PHA bins.
Reduced chi-squared = 0.8893081 for 55 degrees of freedom
Null hypothesis probability = 0.705
Photon flux (15-150 keV) in 64.00 sec: 0.341875 ( -0.04108 0.042275 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.66822e-07 ( -7.36339e-08 7.35232e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 17:05:38 EST 2007