////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19057
SUBJECT: GRB 160223A: Swift detection of a burst
DATE: 16/02/23 02:11:02 GMT
FROM: David Palmer at LANL <palmer@lanl.gov>
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.)
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19058
SUBJECT: GRB 160223A: GROND optical/NIR afterglow
DATE: 16/02/23 07:18:53 GMT
FROM: Thomas Kruehler at MPE Garching <kruehler@mpe.mpg.de>
J. Bolmer (MPE Garching), D. A. Kann (TLS Tautenburg), T. Kruehler,
and J. Greiner (both 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 OPS NOTE(23feb16): Per author's request, DAK was added to the author list.]
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19059
SUBJECT: GRB 160223B: A long GRB detected by INTEGRAL
DATE: 16/02/23 10:54:09 GMT
FROM: Diego Gotz at CEA <diego.gotz@cea.fr>
D.Gotz (CEA, Saclay), S.Mereghetti (IASF-Milano), C.Ferrigno, E.Bozzo, S. Fotopoulou(ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 30 s has been detected by IBAS in the IBIS/ISGRI data at 09:58:58 UT of February 23, 2016.
The refined coordinates (J2000) are:
R.A.= 94.9937 deg
DEC.= +33.4075 deg
with an uncertainty of 2.2 arcmin (90% c.l.).
The burst had a peak flux of 1.2 counts/cm2/s (20-200 keV, 1-s integration
time) and a fluence in the same energy range of about 1.6e-6 erg/cmsq.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19060
SUBJECT: GRB 160223B: Swift ToO observations
DATE: 16/02/23 12:55:22 GMT
FROM: Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the INTEGRAL GRB 160223B.
Automated analysis of the XRT data will be presented online at
http://www.swift.ac.uk/ToO_GRBs/00020601
Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. These are
not necessarily related to the INTEGRAL event. Any X-ray source
considered to be a probable afterglow candidate will be reported via a
GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19061
SUBJECT: GRB 160223B: Fermi GBM observation
DATE: 16/02/23 15:27:58 GMT
FROM: Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin, H.-F. Yu, and K. Toelge (all MPE)
report on behalf of the Fermi GBM Team:
"At 09:59:01.51 UT on 23 February 2016, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 160223B (trigger 477914345 / 160223416),
which was also detected by INTEGRAL (Götz et al. 2016, GCN 19059)
The GBM on-ground location is consistent with the INTEGRAL position.
The angle from the Fermi LAT boresight at the GBM trigger time is 49 degrees.
The GBM light curve shows a structured pulse
with a duration (T90) of about 17 s (50-300 keV).
The time-averaged spectrum from T0-2.560 s to T0+16.896 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.90 (+0.08/-0.07) and
the cutoff energy, parameterized as Epeak, is 560 (+110 /-80) keV
The event fluence (10-1000 keV) in this time interval is
(5.9 +/- 0.3)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+0.256 s in the 10-1000 keV band
is 3.1 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19062
SUBJECT: GRB 160223B: LCOGT-FTN optical observations
DATE: 16/02/23 20:02:48 GMT
FROM: Simone Dichiara at Ferrara U/Italy <dichiara@fe.infn.it>
S. Dichiara, C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU),
A. Gomboc (U. Nova Gorica), C.G. Mundell (U. Bath), on behalf
of a larger collaboration report:
The 2-m LCOGT Faulkes Telescope North began observing
INTEGRAL and Fermi GRB 160223B (Gotz et al. GCN 19059,
von Kienlin et al., GCN 19061) on Feb 23 at 10:06:58 UT
(7.8 minutes after the burst trigger) with r filter.
We do not detect any optical afterglow candidate within the
INTEGRAL error circle (Gotz et al. GCN 19059) down to the
following magnitudes:
Mid Time Exposure Filter Magnitude
(min) (s)
-------------------------------------------------------
12.27 5x120 r' > 20.5
-------------------------------------------------------
Values have been calibrated against nearby USNOB-1 stars
(R2)
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19063
SUBJECT: GRB 160223B: Swift-XRT observations
DATE: 16/02/23 21:18:36 GMT
FROM: Andy Beardmore at U Leicester <ab271@leicester.ac.uk>
T.G.R. Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), S.L.
Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'Ai
(INAF-IASFPA) and P.A. Evans (U. Leicester) report on behalf of the
Swift-XRT team:
Swift-XRT has performed follow-up observations of the INTEGRAL-detected
burst GRB 160223B (Gotz et al. GCN Circ. 19059), collecting 2.3 ks of
Photon Counting (PC) mode data between T0+10.6 ks and T0+16.4 ks.
No X-ray sources have been detected inside or close to the INTEGRAL
error region. The 3-sigma upper limit in the field ranges from ~0.004
to ~0.005 ct s^-1, corresponding to a 0.3-10 keV observed flux of
1.8e-13 to 1.9e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
http://www.swift.ac.uk/ToO_GRBs/00020601.
This circular is an official product of the Swift-XRT team.
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19064
SUBJECT: GRB 160223A: Fermi GBM observation
DATE: 16/02/23 21:35:50 GMT
FROM: Peter Veres at UAH <veresp@gmail.com>
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."
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19065
SUBJECT: GRB 160223B: Khureltogot optical observations
DATE: 16/02/24 01:31:17 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), S. Schmalz (ISON), A. Volnova (IKI), N. Tungalag
(Research Center of Astronomy and Geophysics MAS), I. Molotov (KIAM),
A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of INTEGRAL and Fermi GRB 160223B GRB 160223B (Gotz et
al. GCN 19059; von Kienlin et al., GCN 19061) with ORI-40 telescope of
Khureltogot observatory starting on Feb., 23 (UT) 12:34:31. Within 2.2
arcmin error circle of the GRB 160223B localization (Gotz et al., GCN
19059) we marginally detect two possible sources not presented in USNO-B1.0
catalog. Coordinates of the sources are
Source (1): (J2000) 6:20:05.53 +33:24:58.7
Source (2): (J2000) 6:20:03.89 +33:23:14.2
with uncertainties of 1 arcsec in both coordinates.
At this time we cannot confirm the sources are real or variable due to low
S/N and absence of a full dataset.
Preliminary photometry of the sources is following
Date UT start t-T0 Filter Exp. OT Err UL(3sigma) Source#
(mid, days) (s)
2016-02-23 12:34:31 0.14969 none 7200 18.7 0.35 18.9 (1)
2016-02-23 12:34:31 0.14969 none 7200 18.7 0.30 18.9 (2)
Photometry is based on nearby USNO-B1.0 stars, R2 magnitudes:
USNO-B1_id R2
1234-0146334 14.41
1234-0146221 14.55
1233-0156534 14.77
1234-0146470 13.48
1234-0146172 13.37
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19066
SUBJECT: GRB 160223A: Swift-BAT refined analysis
DATE: 16/02/24 07:39:55 GMT
FROM: Tilan Ukwatta at LANL <tilan.ukwatta@gmail.com>
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/
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19069
SUBJECT: GRB 160223B: MASTER-Amur early observations
DATE: 16/02/24 08:47:56 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
A.Gabovich, V.Yurkov, Yu.Sergienko, D.Varda
Blagoveschensk Educational State University, Blagoveschensk
N.Tyurina, V. Lipunov, E. Gorbovskoy, V.Kornilov,
P.Balanutsa, A.Kuznetsov, D.Kuvshinov
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University
D.Buckley, S. Potter, M.Kotze
South African Astronomical Observatory
K.Ivanov, N.M.Budnev, O.Gres, V.A.Poleshchuk
Irkutsk State University
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian
The Instituto de Astrofisica de Canarias
MASTER-Amur robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Blagoveschensk was pointed to the GRB160223B 32 sec after
trigger time at 2016-02-23 09:59:30 UT. On
our first set (10 sec, unfiltered) we not found optical transients
within INTEGRAL error-box (ra=06 19 54 dec=+33 24 21 r=2'.2 ) brighter
then 15.8.
The message may be cited.
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19072
SUBJECT: GRB 160223A: AbAO optical observations
DATE: 16/02/24 20:22:47 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
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.
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19074
SUBJECT: GRB 160223A: Swift-XRT afterglow detection
DATE: 16/02/25 13:19:17 GMT
FROM: Andy Beardmore at U Leicester <ab271@leicester.ac.uk>
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.
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19079
SUBJECT: GRB 160223A: RATIR Optical and NIR Observations
DATE: 16/02/25 17:46:00 GMT
FROM: Nat Butler at Az State U <natbutler@asu.edu>
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),
José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM),
Carlos Román-Zúñiga (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 Astronómico
Nacional on Sierra San Pedro Mártir 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 = 18.13 +/- 0.01
i = 17.43 +/- 0.01
Z = 17.37 +/- 0.01
Y = 17.20 +/- 0.01
J = 17.08 +/- 0.01
H = 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 Astronómico Nacional in San Pedro
Mártir.
////////////////////////////////////////////////////////////////////////
TITLE: GCN CIRCULAR
NUMBER: 19085
SUBJECT: GRB 160223B: CALET Gamma-Ray Burst Monitor detection
DATE: 16/02/26 03:05:55 GMT
FROM: Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
S. Ozawa (Wasoeda U), A. Yoshida, T. Sakamoto, I. Takahashi, Y. Kawakubo,
K. Senuma, M. Moriyama, Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR),
M. L. Cherry (LSU), S. Ricciarini (U of Florence) P. S. Marrocchesi (U of Siena)
and the CALET collaboration:
The long-duration GRB160223B (Gotz et al., GCN Circ. 19059; von Kienlin et al., GCN Circ. 19061)
triggered the CALET Gamma-Ray Burst Monitor (CGBM) at 09:58:59.5 on 23 February 2016.
The burst signal was detected by SGM instrument.
The light curve of the SGM shows at least three peaks. The emission starts at T0,
peaks at T0+1 sec and ends at T0+25 sec. The T90 duration measured by the SGM data
is 11 +- 1 sec (40-1000 keV).
The CGBM data used in this analysis are provided by the Waseda CALET Operation Center
located at the Waseda University.