TDRSS lightcurve for Trigger=811686
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sun 25 Feb 18 20:32:09 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 811686, Seg_Num: 0
GRB_RA: 185.609d {+12h 22m 26s} (J2000),
185.836d {+12h 23m 21s} (current),
184.983d {+12h 19m 56s} (1950)
GRB_DEC: +29.293d {+29d 17' 34"} (J2000),
+29.192d {+29d 11' 32"} (current),
+29.570d {+29d 34' 12"} (1950)
GRB_ERROR: 4.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=984 [image_cnts]
TRIGGER_DUR: 64.000 [sec]
TRIGGER_INDEX: 20000 E_range: 15-50 keV
BKG_INTEN: 0 [cnts]
BKG_TIME: 0.00 SOD {00:00:00.00} UT
BKG_DUR: 0 [sec]
GRB_DATE: 18174 TJD; 56 DOY; 18/02/25
GRB_TIME: 73851.46 SOD {20:30:51.46} UT
GRB_PHI: 11.97 [deg]
GRB_THETA: 31.47 [deg]
SOLN_STATUS: 0x1099D
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 6.20 [sigma]
MERIT_PARAMS: +0 +0 +125 +6 +1 -4 +0 +0 +84 +1
SUN_POSTN: 338.90d {+22h 35m 36s} -8.87d {-08d 52' 11"}
SUN_DIST: 147.58 [deg] Sun_angle= 10.2 [hr] (West of Sun)
MOON_POSTN: 101.36d {+06h 45m 26s} +20.19d {+20d 11' 18"}
MOON_DIST: 75.69 [deg]
MOON_ILLUM: 78 [%]
GAL_COORDS: 192.53, 83.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 172.36, 28.87 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This is an image trigger. (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)
COMMENTS: A point_source was found.
COMMENTS: This is a low-flux event whose position matches one of the nearby galaxy sources in the on-board catalog!
COMMENTS: This matches a source in the on-board catalog: Num=12182=NGC4310, delta=0.084 [deg].
COMMENTS: This matches a source in the ground catalog: NGC4310, delta=0.084 [deg].
COMMENTS: Galaxy NGC4310 (of total mag=13.00 and dia=2.60 arcmin) is inside the position error circle.
COMMENTS: There is a 0.09% probability that an NGC galaxy would happen by chance coincidence.
COMMENTS: This is a GRB in nearby galaxy or it is noise.
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sun 25 Feb 18 20:47:45 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 811686, Seg_Num: 0
GRB_RA: 185.609d {+12h 22m 26s} (J2000),
185.836d {+12h 23m 21s} (current),
184.983d {+12h 19m 56s} (1950)
GRB_DEC: +29.293d {+29d 17' 34"} (J2000),
+29.192d {+29d 11' 32"} (current),
+29.570d {+29d 34' 12"} (1950)
GRB_DATE: 18174 TJD; 56 DOY; 18/02/25
GRB_TIME: 73851.46 SOD {20:30:51.46} UT
TRIGGER_INDEX: 20000
GRB_PHI: 11.97 [deg]
GRB_THETA: 31.47 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x99D
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 6.20 [sigma]
LC_URL: sw00811686000msb.lc
GCN template for BAT paragraph
Click here!
At 20:30:51 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 180225 ***A*** (trigger=811686). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 185.609, +29.293 which is
RA(J2000) = 12h 22m 26s
Dec(J2000) = +29d 17' 34"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a [**double-peaked**]
structure with a duration of about TTT sec. The peak count rate
was ~1156 counts/sec (15-350 keV), at ~1 sec after the trigger.
Test version of draft template
Initial TDRSS lightcurve and spacecraft attitude plot
TDRSS lightcurve from T0-30 to T0+50 (zoom in)
TDRSS light curve from T0-1 to T0+2 (More zoom in)
1.6s binned TDRSS light curve
Tilan's background subtracted TDRSS light curves
Extended TDRSS light curve and spacecraft attitude plot(s)
Extended TDRSS lc No.1
Extended TDRSS lc No.2
Extended TDRSS lc No.3
Extended TDRSS lc No.4
TDRSS extended lightcurve from T0-1 to T0+2
T50 and T90 calculation
******************************************
battblocks v1.18
------------------------------------------
Input Data: bat_raw_lc.fits
Output GTI: bb.gti
Events to Skip: 128 Changepoint log(prob) Prior: 6.000000
Internal Tick: 1.000000e-04 s
Lookback time: 0 s
Bkg. Subtract?: yes (for fluence/T50/T90 calculations)
------------------------------------------
Estimated background rate 1: 5332.245 near MET 541283501.760000 s
Estimated background rate 2: 5246.230 near MET 541283606.720000 s
Estimated total fluence: 0.000000 count
Created GTI with 2 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 185.609 29.293 0.083
No match
Link to SIMBAD
Click here for the SIMBAD search!
Frank's UVOT result
Click here!
Frank's UVOT Blinking images
Click here!
Elevation angle of GRB/Sun at the ground telescope locations
GSFC, Greenbelt, Maryland
TimeUT Azimuth Elevation
Sun: 2018 2 25 20 46.216529 29.731793
Obj: 2018 2 25 20 191.587589 -20.862102
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2018 2 25 20 8.120015 49.086889
Obj: 2018 2 25 20 159.112744 -25.791593
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2018 2 25 20 359.097902 47.739455
Obj: 2018 2 25 20 154.125526 -22.260406
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2018 2 25 20 302.954556 41.864064
Obj: 2018 2 25 20 125.922296 -9.611697
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2018 2 25 20 280.007605 0.608601
Obj: 2018 2 25 20 131.368611 7.894129
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2018 2 25 20 265.317062 -22.571247
Obj: 2018 2 25 20 93.391411 54.362840
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2018 2 25 20 86.129349 -11.591952
Obj: 2018 2 25 20 235.844342 -0.566946
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2018 2 25 20 107.252546 42.667380
Obj: 2018 2 25 20 269.502402 -74.084238
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger811686/tdrss_ql/
bat_raw_lc.fits : TDRSS FITS light curve from GCN
gcn_position.txt : GCN BAT position notice
ratelc_tdrss.qdp : QDP file of the TDRSS light curve
tdrss_lc.gif : GIF TDRSS light curve
sc_att.qdp : QDP file of the spacecraft attitude
sc_att.gif : GIF spacecraft attitude
bb.gti : Bayesian block GTI file (battblocks)
dur.gti : Duration GTI file (battblocks)
battblocks.log : Output log of battblocks
Plot creation:
Sun Feb 25 15:48:08 EST 2018