batgrbproduct Analysis for Trigger=250033
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 2 15:44:54 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger250033/GCN5_download_cron
======================================================================
Trigger: 00250033 Segment: 000
BAT Trigger Time: 187721792 [s; MET]
Trigger Stop: 187721856 [s; MET]
UTC: 2006-12-13T16:56:30.368500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.837751266839 Dec: 11.0110992320629 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.56
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.56
Flight Position: [ source = BAT ]
RA: 288.837751266839 Dec: 11.0110992320629 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.776607393175 Dec: 10.9531494989448 [deg; J2000]
{ 19h 15m 06.4s , +10d 57' 11.3" }
+/- 2.72531983600815 [arcmin] (estimated 90% radius based on SNR)
+/- 1.58601541235332 [arcmin] (formal 1-sigma fit error)
SNR: 7.26262152616577
RA = 19h 15m 6.4s (288.776607 deg.)
Dec = 10d 57' 11" (10.953149 deg.)
Angular difference between Flight and Ground position is 5.005980 arcmin
Partial Coding Fraction: 0.703125 [ 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 0.379927 0.330012 0.105113 0.039868
0.063517 0.067512 0.068623 0.075890 [error]
Peak 0.379927 0.330012 0.105113 0.039868
0.063517 0.067512 0.068623 0.075890 [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 1.25e-07 1.36e-07 1.06e-07 1.34e-07 4.17e-07 5.01e-07 erg/cm2
Error 3.45e-08 3.69e-08 5.90e-08 1.39e-07 1.33e-07 2.30e-07 erg/cm2
Peak flux Power-law 8.77e-02 5.31e-02 2.06e-02 1.07e-02 1.67e-01 1.72e-01 ph/cm2/s
Error 2.48e-02 1.38e-02 1.11e-02 1.10e-02 3.74e-02 3.98e-02 ph/cm2/s
Fluence Cutoff-PL 1.25e-07 1.37e-07 1.06e-07 1.33e-07 4.18e-07 4.59e-07 erg/cm2
Error 3.46e-08 3.71e-08 5.91e-08 1.37e-07 1.33e-07 2.53e-07 erg/cm2
Peak flux Cutoff-PL 8.76e-02 5.31e-02 2.06e-02 1.06e-02 1.67e-01 1.72e-01 ph/cm2/s
Error 2.48e-02 1.38e-02 1.11e-02 1.09e-02 3.74e-02 3.98e-02 ph/cm2/s
Fluence Band 1.24e-07 1.36e-07 1.05e-07 1.33e-07 4.17e-07 4.81e-07 erg/cm2
Error 3.62e-08 3.68e-08 6.00e-08 1.37e-07 1.33e-07 2.40e-07 erg/cm2
Peak flux Band 8.35e-02 5.36e-02 2.18e-02 1.18e-02 1.66e-01 1.75e-01 ph/cm2/s
Error 2.19e-02 1.23e-02 7.57e-03 4.90e-03 3.71e-02 3.86e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.366 0.556 - - 9.20e-04 3.73e-04 75.471 57
CPL 1.866 0.000 9.7 0.0 1.90e-03 6.46e-04 75.684 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.366 0.556 - - 9.20e-04 3.73e-04 75.471 57
CPL 1.866 0.000 9.7 0.0 1.90e-03 6.46e-04 75.684 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
288.7766 +10.9531 0.0265 33.8 -23.1 1.0738 7.3 TRIG_00250033
------------------------------------------
Foreground time interval of the image:
0.000 46.850 (delta_t = 46.850 [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 46.850 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36647 ( -0.496355 0.615800 )
Norm@50keV : 9.201399E-04 ( -3.764236E-04 3.703783E-04) )
------------------------------------------------------------
Chi-Squared = 75.47128 using 59 PHA bins.
Reduced chi-squared = 1.324057 for 57 degrees of freedom
Null hypothesis probability = 5.123E-02
Photon flux (15-150 keV) in 46.85 sec: 0.166969 ( -0.037319 0.037414 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17431e-07 ( -1.25878e-07 1.40375e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 46.850 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86647 ( )
Epeak [keV] : 9.66525 ( )
Norm@50keV : 1.896086E-03 ( -8.487766E-04 4.429679E-04) )
------------------------------------------------------------
Chi-Squared = 75.68446 using 59 PHA bins.
Reduced chi-squared = 1.351508 for 56 degrees of freedom
Null hypothesis probability = 4.097E-02
Photon flux (15-150 keV) in 46.85 sec: 0.166904 ( -0.037306 0.037401 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1759e-07 ( -1.26092e-07 1.40103e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 46.850 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49896 ( -0.592674 14.4073 )
beta : -2.41197 ( -0.615671 0.496304 )
Epeak [keV] : 14.8588 ( -14.7588 9985.14 )
Norm@50keV : 4.025180E-03 ( -5.109335E-02 5.036342E-02) )
------------------------------------------------------------
Chi-Squared = 75.69357 using 59 PHA bins.
Reduced chi-squared = 1.376247 for 55 degrees of freedom
Null hypothesis probability = 3.358E-02
Photon flux (15-150 keV) in 46.85 sec: 0.166220 ( -0.036038 0.038115 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1662e-07 ( -1.26003e-07 1.40197e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 46.850 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.36647 ( -0.496355 0.615800 )
Norm@50keV : 9.201399E-04 ( -3.764236E-04 3.703783E-04) )
------------------------------------------------------------
Chi-Squared = 75.47128 using 59 PHA bins.
Reduced chi-squared = 1.324057 for 57 degrees of freedom
Null hypothesis probability = 5.123E-02
Photon flux (15-150 keV) in 46.85 sec: 0.166969 ( -0.037319 0.037414 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.17431e-07 ( -1.25878e-07 1.40375e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 46.850 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86647 ( )
Epeak [keV] : 9.66525 ( )
Norm@50keV : 1.896086E-03 ( -8.470818E-04 4.443913E-04) )
------------------------------------------------------------
Chi-Squared = 75.68446 using 59 PHA bins.
Reduced chi-squared = 1.351508 for 56 degrees of freedom
Null hypothesis probability = 4.097E-02
Photon flux (15-150 keV) in 46.85 sec: 0.166904 ( -0.037306 0.037401 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1759e-07 ( -1.26092e-07 1.40103e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 46.850 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49896 ( -0.592674 14.4073 )
beta : -2.41197 ( -0.615671 0.496304 )
Epeak [keV] : 14.8588 ( -14.7588 9985.14 )
Norm@50keV : 4.025180E-03 ( -5.109335E-02 5.036342E-02) )
------------------------------------------------------------
Chi-Squared = 75.69357 using 59 PHA bins.
Reduced chi-squared = 1.376247 for 55 degrees of freedom
Null hypothesis probability = 3.358E-02
Photon flux (15-150 keV) in 46.85 sec: 0.166220 ( -0.036038 0.038115 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1662e-07 ( -1.26003e-07 1.40197e-07 ) ergs/cm2
Plot creation:
Wed Jan 2 15:53:06 EST 2008