- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 23 Feb 16 01:48:02 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 675361, Seg_Num: 0
GRB_RA: 147.584d {+09h 50m 20s} (J2000),
147.798d {+09h 51m 12s} (current),
146.918d {+09h 47m 40s} (1950)
GRB_DEC: +9.373d {+09d 22' 21"} (J2000),
+9.297d {+09d 17' 48"} (current),
+9.607d {+09d 36' 24"} (1950)
GRB_DATE: 17441 TJD; 54 DOY; 16/02/23
GRB_TIME: 6265.27 SOD {01:44:25.27} UT
TRIGGER_INDEX: 313
GRB_PHI: 108.68 [deg]
GRB_THETA: 23.49 [deg]
DELTA_TIME: 44.00 [sec]
TRIGGER_DUR: [sec], copy from BAT_POS unavailable
SOLN_STATUS: 0x0
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 0.00 [sigma]
LC_URL: sw00675361000msb.lc
SUN_POSTN: 335.77d {+22h 23m 05s} -10.09d {-10d 05' 13"}
SUN_DIST: 172.10 [deg] Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN: 158.52d {+10h 34m 05s} +7.72d {+07d 43' 06"}
MOON_DIST: 10.72 [deg]
MOON_ILLUM: 100 [%]
GAL_COORDS: 226.69, 43.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 146.56, -3.50 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS: WARNING: No BAT_Position TDRSS message was received for this trigger_number!
COMMENTS:
COMMENTS: This does not match any source in the ground catalog.
- red DSS finding chart
ps-file
- GCN Circular #19057
C. B. Markwardt (NASA/GSFC), J. A. Kennea (PSU),
F. E. Marshall (NASA/GSFC) and D. M. Palmer (LANL) report on behalf of
the Swift Team:
At 01:44:25 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 160223A (trigger=675361). Swift could not slew
immediately to the burst due to a Moon observing constraint.
The BAT on-board calculated location is
RA, Dec 147.584, +9.373 which is
RA(J2000) = 09h 50m 20s
Dec(J2000) = +09d 22' 21"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a complex
structure near T+0 s about 30 seconds long, followed by an
additional brighter structure peaking at around T+100 for
a total duration of ~120 seconds. The peak count rate
was ~2200 counts/sec (15-350 keV), at ~110 sec after the trigger.
Due to the proximity to the Moon this GRB will not be observable by
XRT or UVOT until 22:27UT on Feb 23rd, 2016.
Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt AT nasa.gov).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
- GCN Circular #19058
J. Bolmer, T. Kruehler, and J. Greiner (all MPE Garching) report
on behalf of the GROND team:
We observed the field of GRB 160223A (Swift trigger 675361; Markwardt et
al., GCN #19057) simultaneously in g'r'i'z'JHK with GROND (Greiner
et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at the
ESO La Silla Observatory (Chile).
Observations started at 03:30:41 UT on 2016-02-23, 106 min after the GRB
trigger. They were performed at an average seeing of 1".2 and at an
average airmass of 1.3.
We find a bright, uncatalogued point source within the Swift-BAT error
circle at
RA (J2000.0) = 09:50:23.34
Dec. (J2000.0) = +09:22:09.0
with an uncertainty of 0".5 in each coordinate.
Based on the first 4.4 min of total exposure in g'r'i'z' and 4.0 min
in JHK at a mid-time of 03:34:13 UT, we derive the following preliminary
magnitudes (all in AB system):
g = 17.8 +- 0.1 mag
r = 16.9 +- 0.1 mag
i = 16.5 +- 0.1 mag
z = 16.2 +- 0.1 mag
J = 16.1 +- 0.1 mag
H = 15.9 +- 0.1 mag
K = 15.8 +- 0.1 mag
The object fades by 0.4 mag until 04:55 UT on 2016-02-23, so we
propose this source to be the optical/NIR afterglow of GRB 160223A.
Given magnitudes are calibrated against SDSS as well as 2MASS
field stars and are not corrected for the expected Galactic foreground
extinction corresponding to a reddening of E_(B-V) = 0.03 mag in the
direction of the burst (Schlafly & Finkbeiner 2011).
- GCN Circular #19064
P Veres (UAH), K Toelge (MPE), C Meegan (UAH) and C M Hui (MSFC)
report on behalf of the Fermi GBM Team:
"At 01:44:22.39 UT on 23 February 2016, the Fermi Gamma-Ray Burst
Monitor triggered
and located GRB 160223A (trigger 477884666 / 160223072) which was also
detected by the Swift/BAT
(Markwardt et al., GCN 19057). The GBM on-ground location is consistent
with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 75
degrees.
The GBM light curve shows two separate peaks
with a duration (T90) of about 117 s (50-300 keV).
The time-averaged spectrum from T0-6 s to T0+124 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.96 +/- 0.06 and
the cutoff energy, parameterized as Epeak, is 308 +/- 30 keV.
The event fluence (10-1000 keV) in this time interval is
(1.46 +/- 0.06)E-5 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+2.7 s in the 10-1000 keV band
is 5.4 +/- 0.2 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak= 282 +/- 45 keV, alpha = -0.94 +/- 0.08 and beta = -2.20 +/-
0.23.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
- GCN Circular #19066
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+581 sec from the recent
telemetry downlink, we report further analysis of BAT GRB
160223A (trigger #675361) (Markwardt, et al., GCN Circ.
19057). The BAT ground-calculated position is
RA, Dec = 147.603, 9.369 deg which is
RA(J2000) = 09h 50m 24.8s
Dec(J2000) = +09d 22' 09.3"
with an uncertainty of 1.0 arcmin, (radius, sys+stat,
90% containment). The partial coding was 53%.
BAT light curve shows two episodes. The first episode
starts ~T-10 sec, peaks at ~T+0 sec and ends around ~T+20 sec.
The second multi-peaked episode starts around T+70 sec and
ends around ~T+120 sec. T90 (15-350 keV) is
127 +- 8 sec (estimated error including systematics).
The time-averaged spectrum from T-6.00 to T+143.13 sec
is best fit by a simple power-law model. The power law
index of the time-averaged spectrum is 1.34 +- 0.07.
The fluence in the 15-150 keV band is
5.0 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux
measured from T+109.95 sec in the 15-150 keV band is
3.1 +- 0.2 ph/cm2/sec. All the quoted errors are at
the 90% confidence level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/675361/BA/
- GCN Circular #19072
E. Mazaeva (IKI), R. Inasaridze (AbAO), V. Ayvazian (AbAO), A. Volnova
(IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger
GRB follow-up collaboration:
We observed the field of Swift and Fermi GRB 160223A (Markwardt et
al., GCN 19057; Veres et al., GCN 19064) with AS-32 (0.7m) telescope of
Abastumani Observatory starting on Feb. 23 (UT) 23:51:22. We obtained
several unfiltered images of the field. We do not detect afterglow
candidate (Bolmer et al., GCN 19058) down to 20.4m. A preliminary
photometry of the field is following
Date UT start t-T0 Filter Exp. UL (3 sigma)
(mid, days) (s)
2016-02-23 23:51:22 0.96907 none 21*120 20.4
photometry is based on nearby stars of SDSS DR9 catalog, Lupton
transformation into R.
- GCN Circular #19074
L.M. McCauley (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester),
K.L. Page (U. Leicester), C. Pagani (U. Leicester), V. D'Elia (ASDC),
A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), B. Sbarufatti
(INAF-OAB/PSU) and P.A. Evans (U. Leicester) report on behalf of the
Swift-XRT team:
Swift-XRT has performed follow-up observations of the
Swift/BAT-detected burst GRB 160223A (Markwardt et al. GCN Circ.
19066), collecting 8.3 ks of Photon Counting (PC) mode data between
T0+109.9 ks and T0+197.1 ks.
An uncatalogued X-ray source has been detected inside the Swift/BAT
error region, at a location consistent with the GROND afterglow
candidate (GCN Circ. 19058). The position of this source is RA,
Dec=147.5977, +9.3696 which is equivalent to:
RA (J2000): 09:50:23.46
Dec(J2000): +09:22:10.4
with an uncertainty of 6.6 arcsec (radius, 90% confidence). This
location is 2.3 arcsec from the reported GROND position. The observed
count rate is (1.69 +/- 0.75)e-3 ct s^-1, which corresponds to an
observed 0.3-10 keV flux of (3.7 +/- 1.7)e-14 erg cm^-2 s^-1. We
cannot determine at the present time whether the source is fading.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00675361.
This circular is an official product of the Swift-XRT team.
- GCN Circular #19079
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William
H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier
Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI),
Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC),
Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM),
Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC),
John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:
We first observed the field of GRB 160223A (Markwardt, et al., GCN 19057)
with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org)
on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico
Nacional on Sierra San Pedro M=E1rtir from 2016/02 23.15 to 2016/02 23.49
UTC
(3.65 to 11.79 hours after the BAT trigger), obtaining a total of 5.04
hours exposure in the r and i bands and 2.26 hours exposure in the Z, Y,
J,
and H bands. We observed a second time from 2016/02 24.12 to 2016/02 24.49
UTC (26.78 to 35.78 hours after the BAT trigger), obtaining a total of 5.02
hours exposure in the r and i bands and 2.12 hours exposure in the Z, Y, J,
and H bands.
We detect the afterglow (Bolmer, et al., GCN 19058) cleanly in the first
epoch. In comparison with the SDSS DR9 and 2MASS catalogs, we obtain the
following magnitudes:
r =3D 18.13 +/- 0.01
i =3D 17.43 +/- 0.01
Z =3D 17.37 +/- 0.01
Y =3D 17.20 +/- 0.01
J =3D 17.08 +/- 0.01
H =3D 16.81 +/- 0.01
The source is clearly fading during the first epoch. In the second epoch=
,
we do not detect the source. We obtain the following (3-sigma) upper
limits:
r > 22.38
i > 22.05
Z > 21.49
Y > 21.44
J > 21.35
H > 21.26
These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro
M=E1rtir.
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