batgrbproduct Analysis for Trigger=277086
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): Thu Dec 13 18:57:11 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger277086/GCN5_download_cron
======================================================================
Trigger: 00277086 Segment: 000
BAT Trigger Time: 199191584 [s; MET]
Trigger Stop: 199191712 [s; MET]
UTC: 2007-04-25T10:59:42.086780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.911234300871 Dec: 45.7751897909794 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 10.62
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.62
Flight Position: [ source = BAT ]
RA: 315.911234300871 Dec: 45.7751897909794 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 315.92885667719 Dec: 45.7175053326533 [deg; J2000]
{ 21h 03m 42.9s , +45d 43' 03.0" }
+/- 2.93631574744115 [arcmin] (estimated 90% radius based on SNR)
+/- 1.94130514267438 [arcmin] (formal 1-sigma fit error)
SNR: 6.52873034026392
RA = 21h 3m 42.9s (315.928857 deg.)
Dec = 45d 43' 3" (45.717505 deg.)
Angular difference between Flight and Ground position is 3.538844 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 128 +/-
Measured from: 0
to: 128 [s; relative to TRIGTIME]
T50: 128 +/-
Measured from: 0
to: 128 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 128 second)
Measured from: 0
to: 128 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 128 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.149409 0.061540 0.035629 0.043158
0.026326 0.026562 0.023653 0.021518 [error]
Peak 0.149409 0.061540 0.035629 0.043158
0.026326 0.026562 0.023653 0.021518 [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 2.80e-08 3.50e-08 3.19e-08 5.05e-08 1.12e-07 1.45e-07 erg/cm2
Error 1.12e-08 1.23e-08 2.10e-08 6.97e-08 4.85e-08 9.59e-08 erg/cm2
Peak flux Power-law 2.76e-02 1.92e-02 8.71e-03 5.52e-03 5.82e-02 6.10e-02 ph/cm2/s
Error 1.13e-02 6.52e-03 5.55e-03 7.58e-03 1.84e-02 2.02e-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 1.45e-07 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 Band 2.88e-02 2.00e-02 7.61e-03 3.86e-03 5.84e-02 6.28e-02 ph/cm2/s
Error 1.22e-02 7.13e-03 4.33e-03 3.41e-03 1.82e-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 2.136 0.706 - - 3.63e-04 1.76e-04 73.710 57
CPL 1.528 0.000 29.5 0.0 8.58e-04 0.00e+00 73.989 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.136 0.706 - - 3.63e-04 1.76e-04 73.710 57
CPL 1.528 0.000 29.5 0.0 8.58e-04 0.00e+00 73.989 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 128.000 0.000 128.000
T90 128.000 0.000 128.000
T50 128.000 0.000 128.000
Peak 128.000 0.000 128.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
315.9289 +45.7175 0.0298 0.0 -17.4 0.3119 6.5 TRIG_00277086
------------------------------------------
Foreground time interval of the image:
0.000 33.095 (delta_t = 33.095 [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 33.095 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13638 ( -0.624090 0.787224 )
Norm@50keV : 3.632590E-04 ( -1.811252E-04 1.716416E-04) )
------------------------------------------------------------
Chi-Squared = 73.70975 using 59 PHA bins.
Reduced chi-squared = 1.293153 for 57 degrees of freedom
Null hypothesis probability = 6.746E-02
Photon flux (15-150 keV) in 33.10 sec: 5.819791E-02 ( -0.0184372 0.0184604 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12172e-07 ( -4.57892e-08 5.11183e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52788 ( )
Epeak [keV] : 29.4568 ( )
Norm@50keV : 8.578732E-04 ( )
------------------------------------------------------------
Chi-Squared = 73.98866 using 59 PHA bins.
Reduced chi-squared = 1.321226 for 56 degrees of freedom
Null hypothesis probability = 5.400E-02
Photon flux (15-150 keV) in 33.10 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53251 ( -15.0000 0.00000 )
beta : -2.18145 ( -1.20166 0.664686 )
Epeak [keV] : 17.7760 ( -17.6673 274.119 )
Norm@50keV : 1.087908E-03 ( -383.981 762781. )
------------------------------------------------------------
Chi-Squared = 73.62252 using 59 PHA bins.
Reduced chi-squared = 1.338591 for 55 degrees of freedom
Null hypothesis probability = 4.753E-02
Photon flux (15-150 keV) in 33.10 sec: 5.839454E-02 ( -0.0182351 0.0182106 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13638 ( -0.624090 0.787224 )
Norm@50keV : 3.632590E-04 ( -1.811252E-04 1.716416E-04) )
------------------------------------------------------------
Chi-Squared = 73.70975 using 59 PHA bins.
Reduced chi-squared = 1.293153 for 57 degrees of freedom
Null hypothesis probability = 6.746E-02
Photon flux (15-150 keV) in 33.10 sec: 5.819791E-02 ( -0.0184372 0.0184604 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12172e-07 ( -4.57892e-08 5.11183e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52788 ( )
Epeak [keV] : 29.4568 ( )
Norm@50keV : 8.578732E-04 ( )
------------------------------------------------------------
Chi-Squared = 73.98866 using 59 PHA bins.
Reduced chi-squared = 1.321226 for 56 degrees of freedom
Null hypothesis probability = 5.400E-02
Photon flux (15-150 keV) in 33.10 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.095 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53251 ( -15.0000 0.00000 )
beta : -2.18145 ( -1.20166 0.664686 )
Epeak [keV] : 17.7760 ( -17.6673 274.119 )
Norm@50keV : 1.087908E-03 ( -383.981 762781. )
------------------------------------------------------------
Chi-Squared = 73.62252 using 59 PHA bins.
Reduced chi-squared = 1.338591 for 55 degrees of freedom
Null hypothesis probability = 4.753E-02
Photon flux (15-150 keV) in 33.10 sec: 5.839454E-02 ( -0.0182351 0.0182106 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Dec 13 19:00:51 EST 2007