Analysis for Ground-detected GRB: Trigger=295492
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This is a special analysis for ground-detected GRB. The event data duration is likely to be shorter than the burst duration. In such cases, the burst durations are found using the quad-rate data, and spectral analyses are only available for event data range.
- 3) Some mask-weighted light curve plots might be missing because the time range is not completely covered by the event data range.
Special note: This burst was outside the BAT calibrated field of view (the FLUX mask region)
in the whole event data range (see figure below),
hence spectral analysis is not available.
FLUX-mask-weighted light curve (pcodethresh=0.05; aperture=CALDB:FLUX)
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BAT GROUND-DETECTED GRB DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Thu Dec 17 18:33:17 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger295492
======================================================================
Trigger: 00295492 Segment: 000
BAT Trigger Time: 215232227.2
UTC: 2007-10-28T02:43:44.878 [includes UTCF correction]
Where From?: Ground analysis (best_duration.txt)
NOTE: BAT trigger time for ground-detected burst is the T100 start time.
Analysis Position: [ source = GCN ]
RA: 354.191 354.191 Dec: -31.623 -31.623 [deg; J2000]
Refined Position: [ source = BAT pre-slew image ]
RA: 354.191 Dec: -31.623 [deg; J2000]
{ 23h 36m 45.8s , -31d -37' -22.8" }
+/- 3.3551428089 [arcmin] (estimated 90% radius based on SNR)
SNR: 5.39708761917
Angular difference between the GCN position (ra=354.191 354.191, dec=-31.623 -31.623 deg) and this refined position is 0.002 arcmin
Partial Coding Fraction: 0.03710938 [ including projection effects ]
Duration
T90: 51.2000000178814 +/- 1.6
Measured from: 1.6
to: 52.8 [s; relative to TRIGTIME]
T50: 28.8000000119209 +/- 1.6
Measured from: 12.8
to: 41.6 [s; relative to TRIGTIME]
=== Table of the duration information ==
Value tstart tstop
T100 54.400 0.000 54.400
T90 51.200 1.600 52.800
T50 28.800 12.800 41.600
Peak 1.000 1.900 2.900
Click here for the BAT GCN circular template
Special notes of this burst
Image
15.0-350.0 keV image (Event data with DETECTION mask)
#RAcent DECcent POSerr Theta Phi Peak_Cts SNR Name
354.191 -31.623 0.000 56.852 167.676 3.129 5.397 TRIG_00295492
Image time interval: 45.800 to 55.800 [sec]
Lightcurves
Notes:
- 1) The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
- 2) 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 (for the best duration plot, slew times are marked by green arrows).
- 3) For lightcurves in unit of count rate, time of each bin is in the middle of the bin.
Best duration plot
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)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Mask shadow pattern (with DETECTION mask)
IMX = -1.49591876002, IMY = -0.326829786671
TIME vs. PHA plot around the beginning of event data (event_start to event_start+0.64s) with DETECTION mask
TIME vs. DetID plot around the beginning of event data (event_start to event_start+0.64s) with DETECTION mask
100 us light curve (15-350 keV; (event_start to event_start+0.64s)
Spacecraft aspect plot
Bright source in the event data image
Event data image of 15-350 keV band
Time interval of the image:
2.984000 7.840600
45.800000 55.528000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
299.5720 35.2485 5.6 37.2 -60.9 0.5189 2.1 3.0 Cyg X-1
308.0675 41.0294 11.9 32.2 -48.1 -0.1833 -1.0 5.0 Cyg X-3
325.9660 38.4386 17.3 19.3 -35.3 -0.1006 -0.7 11.9 Cyg X-2
Webpage updated on:
Thu Dec 17 19:39:44 EST 2015