batgrbproduct Analysis for Trigger=348781
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 v2.44
Process Start Time (local time): Thu Apr 9 17:15:51 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger348781/GCN5_download_cron
======================================================================
Trigger: 00348781 Segment: 000
BAT Trigger Time: 260939778.944 [s; MET]
Trigger Stop: 260939779.968 [s; MET]
UTC: 2009-04-09T03:16:14.300500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.828543063383 Dec: 20.6637347679332 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.61
Image Trigger?: NO
Rate S/N Ratio: 23.7907545067406 [ if not an image trigger ]
Image S/N Ratio: 6.61
Flight Position: [ source = BAT ]
RA: 268.828543063383 Dec: 20.6637347679332 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.825212822548 Dec: 20.6734856931553 [deg; J2000]
{ 17h 55m 18.1s , +20d 40' 24.5" }
+/- 3.52900060990272 [arcmin] (estimated 90% radius based on SNR)
+/- 2.34705283567075 [arcmin] (formal 1-sigma fit error)
SNR: 5.02063628889317
Angular difference between Flight and Ground position is 0.614200 arcmin
Partial Coding Fraction: 0.3476562 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.012984 0.013713 0.047411 0.095888
0.015178 0.017633 0.018763 0.023596 [error]
Peak -0.012984 0.013713 0.047411 0.095888
0.015178 0.017633 0.018763 0.023596 [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 4.65e-10 3.73e-09 2.66e-08 1.05e-06 9.77e-08 4.23e-07 erg/cm2
Error 2.02e-09 6.97e-09 2.37e-08 9.94e-07 7.38e-08 0.00e+00 erg/cm2
Peak flux Power-law 1.38e-02 5.84e-02 2.09e-01 2.63e+00 6.04e-01 2.91e+00 ph/cm2/s
Error 6.22e-02 1.15e-01 1.92e-01 2.36e+00 5.19e-01 2.29e+00 ph/cm2/s
Fluence Cutoff-PL 4.81e-10 3.82e-09 2.70e-08 1.04e-06 9.84e-08 2.15e-07 erg/cm2
Error 2.01e-09 6.97e-09 2.37e-08 1.12e-06 7.40e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.41e-02 5.95e-02 2.12e-01 2.60e+00 6.10e-01 2.89e+00 ph/cm2/s
Error 6.20e-02 1.15e-01 1.82e-01 2.67e+00 5.19e-01 2.58e+00 ph/cm2/s
Fluence Band 5.27e-11 1.51e-09 1.94e-08 9.51e-07 9.89e-08 1.92e-07 erg/cm2
Error 1.58e-09 2.69e-08 9.71e-07 6.07e-08 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.42e-02 5.97e-02 2.12e-01 2.60e+00 1.85e-01 2.85e+00 ph/cm2/s
Error 6.20e-02 1.15e-01 1.86e-01 3.17e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.833 1.388 - - 3.01e-03 4.10e-03 87.012 57
CPL -1.230 6.500 976.1 0.0 3.26e-03 4.17e-03 87.128 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.833 1.388 - - 3.01e-03 4.10e-03 87.012 57
CPL -1.230 6.500 976.1 0.0 3.26e-03 4.17e-03 87.128 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.8252 +20.6735 0.0383 47.3 -11.4 0.1955 5.0 TRIG_00348781
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.944 -27.394 (delta_t = 33.550 [sec])
-16.944 -10.944 (delta_t = 6.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.833410 ( -1.34553 1.43002 )
Norm@50keV : 3.005029E-03 ( -3.005029E-03 5.197328E-03) )
------------------------------------------------------------
Chi-Squared = 87.01216 using 59 PHA bins.
Reduced chi-squared = 1.526529 for 57 degrees of freedom
Null hypothesis probability = 6.398E-03
Photon flux (15-150 keV) in 1.024 sec: 0.604045 ( -0.604045 0.434635 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.77458e-08 ( -9.77458e-08 4.99078e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.22975 ( -1.77025 11.2297 )
Epeak [keV] : 976.090 ( )
Norm@50keV : 3.262809E-03 ( -2.875694E-03 5.456175E-03) )
------------------------------------------------------------
Chi-Squared = 87.12769 using 59 PHA bins.
Reduced chi-squared = 1.555852 for 56 degrees of freedom
Null hypothesis probability = 4.865E-03
Photon flux (15-150 keV) in 1.024 sec: 0.609549 ( -0.609549 0.429081 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84376e-08 ( -9.84376e-08 4.95386e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.438590 ( -9.56141 5.43859 )
beta : 0.708329 ( -1.30654 1.47218 )
Epeak [keV] : 12.9577 ( -12.8577 9987.04 )
Norm@50keV : 6.041701E-03 ( -6.041700E-03 1735.93 )
------------------------------------------------------------
Chi-Squared = 87.02178 using 59 PHA bins.
Reduced chi-squared = 1.582214 for 55 degrees of freedom
Null hypothesis probability = 3.837E-03
Photon flux (15-150 keV) in 1.024 sec: 0.184898 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.89496e-08 ( -7.28487e-08 4.85524e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.833410 ( -1.34553 1.43002 )
Norm@50keV : 3.005029E-03 ( -3.005029E-03 5.197328E-03) )
------------------------------------------------------------
Chi-Squared = 87.01216 using 59 PHA bins.
Reduced chi-squared = 1.526529 for 57 degrees of freedom
Null hypothesis probability = 6.398E-03
Photon flux (15-150 keV) in 1.024 sec: 0.604045 ( -0.604045 0.434635 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.77458e-08 ( -9.77458e-08 4.99078e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.22975 ( -1.77025 11.2297 )
Epeak [keV] : 976.090 ( )
Norm@50keV : 3.262809E-03 ( -2.875694E-03 5.456175E-03) )
------------------------------------------------------------
Chi-Squared = 87.12769 using 59 PHA bins.
Reduced chi-squared = 1.555852 for 56 degrees of freedom
Null hypothesis probability = 4.865E-03
Photon flux (15-150 keV) in 1.024 sec: 0.609549 ( -0.609549 0.429081 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84376e-08 ( -9.84376e-08 4.95386e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.438590 ( -9.56141 5.43859 )
beta : 0.708329 ( -1.30654 1.47218 )
Epeak [keV] : 12.9577 ( -12.8577 9987.04 )
Norm@50keV : 6.041701E-03 ( -6.041700E-03 1735.93 )
------------------------------------------------------------
Chi-Squared = 87.02178 using 59 PHA bins.
Reduced chi-squared = 1.582214 for 55 degrees of freedom
Null hypothesis probability = 3.837E-03
Photon flux (15-150 keV) in 1.024 sec: 0.184898 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.89496e-08 ( -7.28487e-08 4.85524e-08 ) ergs/cm2
Plot creation:
Thu Apr 9 17:35:44 EDT 2009