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GRB 160816A

GCN Circular 19802

Subject
GRB 160816A: Fermi-LAT detection
Date
2016-08-16T23:15:28Z (9 years ago)
From
Judith Racusin at GSFC <judith.racusin@nasa.gov>
J. L. Racusin (NASA/GSFC), F. Dirirsa (U. Johannesburg), F. Longo (University and INFN, Trieste), 
J. McEnery (NASA/GSFC), and G. Vianello (Stanford) report on behalf of the Fermi-LAT team:

At 17:30:58 on August 16, 2016 Fermi-LAT detected high-energy emission from GRB 160816A, which 
was also detected by Fermi-GBM (trigger 493061460 / 160816730). 

The best LAT on-ground location is found to be:
RA, Dec = 322.45, 37.16 (J2000)
with an error radius of 0.13 deg (90% containment, statistical error only). 

This was 35 deg from the LAT boresight at the time of the trigger and triggered an autonomous repoint 
of the spacecraft. 

The data from the Fermi-LAT show a significant increase in the event rate that is spatially 
and temporally correlated with the trigger with high significance. The highest-energy photon is a 9.5 GeV 
event which is observed ~1100 seconds after the GBM trigger.

A Swift ToO request has been approved for this burst.

The Fermi-LAT point of contact for this burst is Francesco Longo (francesco.longo@trieste.infn.it).

The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater 
than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and 
many scientific institutions across France, Italy, Japan and Sweden.

GCN Circular 19803

Subject
GRB 160816A: Swift ToO observations
Date
2016-08-17T00:35:15Z (9 years ago)
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 Fermi/LAT GRB 160816A. 
Automated analysis of the XRT data will be presented online at
http://www.swift.ac.uk/ToO_GRBs/00020685

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 Fermi/LAT 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.

GCN Circular 19805

Subject
GRB 160816A: MASTER inspection
Date
2016-08-17T05:44:51Z (9 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy,  N.Tyurina, V.Kornilov,
P.Balanutsa, A.Kuznetsov, D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute

R. Rebolo, M. Serra, N. Lodieu, G. Israelian
The Instituto de Astrofisica de Canarias

K.Ivanov, O.Gres, N.M.Budnev, S.Yazev,
Irkutsk State University

D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory

A. Tlatov, V.Senik, D. Dormidontov, A.Parkhomenko
Kislovodsk Solar Station of the Pulkovo Observatory

V.Yurkov, Yu.Sergienko, A.Gabovich
Blagoveschensk Educational State University, Blagoveschensk

Hugo Levato, Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

R.Podesta, C.Mallamaci, C.Lopez, F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

MASTER-IAC robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Teide observatory was pointed to the Fermi LAT
GRB160816A  924 sec after notice time at 2016-08-16 22:57:12 UT 
(NOTICE_DATE:Tue 16  Aug 16 22:42:36 UT)  and 19665 sec after the trigger 
time(the delay in 15min was from the inspection of previous FermiGBM 
alert and late notice time).

  On our first  180s exposures we haven`t found optical transient  within
  LAT error-box (RA, Dec = 322.45, 37.16 (J2000) r=0.13).

There is a disc galaxy (unknown in NED) inside LAT error-box at the 
position 21h 29m 23.16s +37d 05m 54.9s - possible host galaxy for GRB.

The 5-sigma upper limit has been about 19.7 mag
The message may be cited.

GCN Circular 19806

Subject
GRB 160816A: Swift-XRT afterglow detection
Date
2016-08-17T07:10:35Z (9 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU),
S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A. D'Ai (INAF-IASFPA), A. Maselli  (INAF-IASFPA), A.
Melandri (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of
the Swift-XRT team:

Swift-XRT has performed follow-up observations of the
Fermi/LAT-detected burst GRB 160816A (Racusin et al. GCN Circ. 19802),
collecting 1.6 ks of Photon Counting (PC) mode data between T0+25.2 ks
and T0+31.8 ks. 

An uncatalogued X-ray source is detected and is above the RASS limit,
and is therefore likely the GRB afterglow.  The position of this source
is RA, Dec=322.4108, +37.1324 which is equivalent to:

RA (J2000): 21:29:38.59
Dec(J2000): +37:07:56.6

with an uncertainty of 3.8 arcsec (radius, 90% confidence).  This
position is 3.8 arcmin from the Fermi/LAT position.  The light curve is
consistent with a constant source of mean count rate 7.8e-02 ct/sec. A
power-law fit gives an index of 1.5 (+1.8, -1.7).

A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.7 (+0.6, -0.3). The
best-fitting absorption column is  2.97 (+3.55, -0.16) x 10^21 cm^-2,
consistent with the Galactic value of 2.8 x 10^21 cm^-2 (Willingale et
al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux
conversion factor deduced from this spectrum  is 4.5 x 10^-11 (5.8 x
10^-11) erg cm^-2 count^-1. 

A summary of the PC-mode spectrum is thus:
Total column:	     2.97 (+3.55, -0.16) x 10^21 cm^-2
Galactic foreground: 2.8 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.7 (+0.6, -0.3)

The results of the XRT-team automatic analysis of the likely afterglow
are at http://www.swift.ac.uk/ToO_GRBs/00020685/index_1.php.
The results of the full analysis of the XRT observations are available
at http://www.swift.ac.uk/ToO_GRBs/00020685.

This circular is an official product of the Swift-XRT team.

GCN Circular 19808

Subject
GRB 160816A: LCOGT-FTN optical candidate
Date
2016-08-17T08:17:39Z (9 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), C.G. Mundell 
(U. Bath), A. Gomboc (U. Nova Gorica) on behalf of a large collaboration 
report:

The 2-m LCOGT Faulkes Telescope North began observing Fermi-LAT GRB 
160816A (Racusin et al., GCN 19802) on August 17, 07:23:08 UT (13.9 
hours after the burst trigger). Inside the Swift-XRT error circle of the 
X-ray afterglow candidate (Kennea et al., GCN 19806) we find an 
uncatalogued source at the following position:

RA(J2000)=  21:29:38.58
Dec(J2000)= +37:07:58.7

with an uncertainty of 1.0 arcsec and r~21.0 +- 0.2 mag (AB).

GCN Circular 19809

Subject
GRB 160816A: RATIR Optical and NIR Observations
Date
2016-08-17T09:26:10Z (9 years ago)
From
Eleonora Troja at GSFC <eleonora.troja@nasa.gov>
Eleonora Troja (GSFC), Alan M. Watson (UNAM), Nat Butler (ASU),
Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G.
Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC),
Josh Bloom (UCB), Antonino Cucchiara (GSFC), Owen Littlejohns (ASU),
Enrico Ramirez-Ruiz (UCSC), Jos�� A. de Diego (UNAM), Leonid Georgiev
(UNAM), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Neil
Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach
Golkhou (ASU), and Vicki Toy (UMD) report:

We observed the field of the Fermi GRB 160816A (Mailyan, et al.,
GCN 19804; Racusin et al. 19802) with the Reionization and Transients
Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson
Telescope at the Observatorio Astron��mico Nacional on Sierra San Pedro
M��rtir from 2017-08-17 06:15 to 07:44 UTC (12.8 to 14.2 hours after
the GBM trigger), obtaining a total of 0.71 hours exposure in the r
and i bands and 0.30 hours exposure in the Z, Y, J, and H bands.

For a source within the Swift/XRT error circle (Kennea et al., GCN 19806),
in comparison with the USNO-B1 and 2MASS catalogs, we obtain the
following detections:

r = 21.05 +/- 0.05
i = 20.79 +/- 0.04
Z = 20.61 +/- 0.07
Y = 20.32 +/- 0.08
J = 20.16 +/- 0.09
H = 19.95 +/- 0.10

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB. The source position is
RA,Dec(J2000)=21:29:38.549,+37:07:58.79 with an uncertainty of 0.5 arcsec.
Our position is consistent with the candidate reported from Guidorzi,
et al. (GCN 19808).

We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.

Further observations are on-going.

GCN Circular 19810

Subject
Konus-Wind observation of GRB 160816A
Date
2016-08-17T13:32:53Z (9 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik,
M. Ulanov,  A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline
on behalf of the Konus-Wind team, report:

The long-duration, very intense, GRB 160816A
(Fermi LAT detection: Racusin et al., GCN Circ. 19802;
Fermi GBM observation: Mailyan and Meegan, GCN Circ. 19804)
triggered Konus-Wind at T0=63061.653 s UT (17:31:01.653).

The burst light curve shows a multipeaked structure
started at ~T0 with a total duration of ~14 s.
The emission is seen up to 3 MeV.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB160816_T63061/

As observed by Konus-Wind, the burst
had a fluence of 3.16(-0.10,+0.11)x10^-5 erg/cm2,
and a 64-ms peak flux, measured from T0+8.032 s,
of 1.63(-0.16,+0.16)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-averaged spectrum of the burst
(measured from T0 to T0+19.712 s)
is best fit in the 20 keV - 3 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with  alpha = -0.81(-0.06,+0.06)
and Ep = 239(-11,+12) keV (chi2 = 51/68 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -3.0
(chi2 = 49/67 dof)

The spectrum near the maximum count rate
(measured from T0+2.304 to T0+8.448 s)
is best fit in the 20 keV - 3 MeV range
by a power law with exponential cutoff model
with  alpha = -0.89(-0.08,+0.09)
and Ep = 244(-18,+20) keV (chi2 = 66/68 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -3.2
(chi2 = 66/67 dof)

All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.

GCN Circular 19814

Subject
GRB 160816A: IPN annulus
Date
2016-08-17T18:17:28Z (9 years ago)
From
Kevin Hurley at UCBerkeley/SSL <khurley@ssl.berkeley.edu>
K. Hurley, on behalf of the IPN, 

I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin,
on behalf of the HEND-Odyssey GRB team,

W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on
behalf of the GRS-Odyssey GRB team,

S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova, 
D. Svinkin, and T. Cline, on behalf of the Konus-Wind team, and

V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, 
on behalf of the Fermi GBM team, report:

GRB 160816A has been observed by Konus-Wind (GCN 19810), Fermi GBM and LAT
(GCN 19804, GCN 19802), and Mars Odyssey-HEND, so far.  We have triangulated
it to a preliminary annulus centered at RA, Dec (2000)=63.3328, 24.0531 degrees,
with radius 83.8027 +/- 0.1087 degrees (3 sigma).  The center line of the annulus passes 0.0086 degrees
from the Swift XRT source (GCN 19806), supporting the conclusion that this source
is the GRB afterglow.  A map has been posted at ssl.berkeley.edu/ipn3/160816A.

GCN Circular 19815

Subject
GRB 160816A: Swift/UVOT Detection
Date
2016-08-17T19:29:32Z (9 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
Paul Kuin (UCL/MSSL), D. Malesani (DARK/NBI and DTU Space), Frank
Marshall (GSFC) and Lea Hagen (PSU) report on behalf of the Swift/UVOT
team:

The Swift/UVOT began settled observations of the field of the Fermi/LAT-
detected GRB 160816A 25222 s after the LAT trigger (Racusin et al. GCN
Circ. 19802). A source consistent with the XRT position (Kennea et al.
GCN Circ. 19806) and the LCOGT Faulkes Telescope North position (Guidorzi
et al., GCN Circ. 19808) is detected in the initial UVOT exposures at the
same position as reported by RATIR (Troja et al, GCN. Circ. 19809).

Preliminary detections and 3-sigma upper limit using the UVOT photometric
system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early
exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white            27601        43846          879         21.48 +/- 0.22
v                27661        27703           41        >17.9
u                25222        37523         2287         21.37 +/- 0.31

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.25 in the direction of the burst
(Schlegel et al. 1998).

GCN Circular 19818

Subject
GRB 160816A iTelescope observation
Date
2016-08-18T03:00:05Z (9 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
Y. Kitaoka, T. Sakamoto, A. Yoshida (AGU)

We observed the field of GRB 160816A detected by Fermi (Racusin et al.,
GCN Circ. 19802) with the iTelescope.Net (http://www.itelescope.net) T7
(17" Plane Wave) telescope located at the AstroCamp Observatory (Nerpio, Spain).
15 images of 60 sec exposures were taken in the R filter starting from
August 16 22:50:57 (UT) about 5.9 hours after the trigger and stopped on
August 16 23:26:36 (UT).  We do not detect the optical afterglow both in the
individual images and the stacked image at the X-ray afterglow position
(Kennea et al., GCN Circ. 19806).  The estimated five sigma upper limit
of the combined image (total exposure of 900 sec) is ~18.3 using the
USNO-B1 catalog.

GCN Circular 19819

Subject
GRB 160816A: confirmed fading with the LT
Date
2016-08-18T12:23:22Z (9 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), C.G. Mundell 
(U. Bath), A. Gomboc (U. Nova Gorica), N. Tanvir (U. Leicester) on 
behalf of a large collaboration report:

The 2-m Liverpool Telescope observed GRB 160816A from August 17, 23:29 
UT to August 18, 02:44 UT with a total net exposure of 600 s in both 
SDSS-R and SDSS-I filters. The optical afterglow candidate (Guidorzi et 
al. GCN 19808; Troja et al. GCN 19809; Kuin et al. GCN 19815) has faded 
to r=21.8 +- 0.2 mag at 1.3 days post burst, compatibly with an average 
power-law decay index alpha~1.

GCN Circular 19820

Subject
GRB 160816A: RATIR Optical and NIR Afterglow Confirmation
Date
2016-08-18T12:35:04Z (9 years ago)
From
Eleonora Troja at GSFC <eleonora.troja@nasa.gov>
Eleonora Troja (GSFC), 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), Owen Littlejohns
(ASU), Enrico Ramirez-Ruiz (UCSC), Jos�� A. de Diego (UNAM),
Leonid Georgiev (UNAM), Jes��s Gonz��lez (UNAM), Carlos Rom��n-
Z����iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John
Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:

We observed the field of GRB 160816A (Mailyan, et al., GCN 19804;
Racusin, et al., GCN 19802) with the Reionization and Transients
Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson
Telescope at the Observatorio Astron��mico Nacional on Sierra San
Pedro M��rtir from 2016/08 18.17 to 2016/08 18.47 UTC (1.44 to
1.72 days after the GBM trigger), obtaining a total of 2.47 hours
exposure in the r and i bands and 1.03 hours exposure in the Z,
Y, J, and H bands.

For the source reported in Troja, et al. (GCN 19809), in comparison
with the USNO-B1 and 2MASS catalogs, we obtain the following
detections and upper limit (3-sigma):


    r    22.74 +/- 0.15
    i    22.40 +/- 0.12
    Z    22.19 +/- 0.19
    Y    22.18 +/- 0.25
    J    > 22.32
    H    21.20 +/- 0.18

These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.

The source intensity decreased significantly between our two epochs,
corresponding to fading with power-law index alpha~-1.3 referenced to
the burst trigger. This confirms that the candidate reported by
Guidorzi, et al. (GCN 19808) and Troja et al. (GCN 19809) is the GRB
afterglow.

Deep imaging of the GRB location reveals additional optical sources
within the XRT localization (Kennea et al., GCN 19806), however none of
them have faded.

We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.

GCN Circular 19821

Subject
GRB 160816A: MASTER OT early detection on coaded images
Date
2016-08-18T16:25:19Z (9 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
N.Tyurina, E. Gorbovskoy, V. Lipunov, V.Kornilov,
P.Balanutsa, A.Kuznetsov, D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute

R. Rebolo, M. Serra, N. Lodieu, G. Israelian
The Instituto de Astrofisica de Canarias

K.Ivanov, O.Gres, N.M.Budnev, S.Yazev,
Irkutsk State University

D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory

A. Tlatov, V.Senik, D. Dormidontov, A.Parkhomenko
Kislovodsk Solar Station of the Pulkovo Observatory

V.Yurkov, Yu.Sergienko, A.Gabovich
Blagoveschensk Educational State University, Blagoveschensk

Hugo Levato, Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

R.Podesta, C.Mallamaci, C.Lopez, F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in IAC was pointed to the  GRB160816.73 24 sec after notice time 
and 18726 sec after trigger time at 2016-08-16 22:43:04 UT. (We corrected 
start  exposition time which published in  previouse MASTER circular 
(Lipunov et al., GCN 19805). We reducted coadded images and found OT.

We see  OT on coadded images inside SWIFT XRT (Kennea et al., GCN19806) at 
LCOGT position (Guidorzi  et al., GCN 19808, Kuin et al., GCN 19815) on two 
tubes with unfiltered magnitude calibrated by USNO B1 stars ( m = 
0.2B+0.8R ):


m_OT=20.5  (+0.5 -0.2) at mean exposition time  2016-08-16 23:05:53, 
20095 sec (5.58 hours)  after GBM trigger time. T_start =18762sec, 
T_end=21464 
after 
trigger. The total exposition = 1800 sec.

The images is available at
http://observ.pereplet.ru/images/GRB160816AMASTER.jpg

The message may be cited.

GCN Circular 19824

Subject
GRB 160816A: Further RATIR Optical and NIR Observations
Date
2016-08-19T14:22:23Z (9 years ago)
From
Eleonora Troja at GSFC <eleonora.troja@nasa.gov>
Eleonora Troja (GSFC), 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 (UVI), Owen Littlejohns
(ASU), Enrico Ramirez-Ruiz (UCSC), Jos�� A. de Diego (UNAM),
Leonid Georgiev (UNAM), Jes��s Gonz��lez (UNAM), Carlos Rom��n-
Z����iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John
Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:

We observed the field of the Fermi GRB 160816A (Mailyan, et al.,
GCN 19804) with the Reionization and Transients Infrared Camera
(RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at
the Observatorio Astron��mico Nacional on Sierra San Pedro M��rtir
from 2016/08 19.16 to 2016/08 19.50 UTC (2.43 to 2.77 days after
the GBM trigger), obtaining a total of 5.58 hours exposure in the
r and i bands and 4.56 hours exposure in the Z and J bands.

For the source reported in Troja, et al. (GCN 19809), in comparison
with the USNO-B1 and 2MASS catalogs, we obtain the  following
detections:

   r    23.45 +/- 0.15
   i    23.18 +/- 0.12
   Z    22.64 +/- 0.12
   J    22.37 +/- 0.16

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��mico Nacional in San Pedro
M��rtir.

GCN Circular 19825

Subject
GRB 160816A: ISON/UAFO optical observations
Date
2016-08-19T15:34:50Z (9 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI),  E. Chornaya (UAFO, ISON), A. Matkin (UAFO), I. 
Molotov (KIAM), A. Pozanenko (IKI) report on behalf of  larger GRB 
follow-up collaboration:

We observed the field of GRB 160816A  (Racusin et al., GCN 19802; 
Mailyan et al., GCN 19804)   with SANTEL-650 (0.65m)  telescope  of 
UAFO/ISON-Ussuriysk observatory. We obtained several unfiltered images 
starting on  August 17 (UT) 11:47:34.  We detected  optical afterglow 
(Guidorzi et al. GCN 19808; Troja et al. GCN 19809). Preliminary 
photometry of a combined image is following

Date       UT start   t-T0   Filter  Exp.   OT     Err.  UL
                       (mid, days)    (s)

2016-08-17 11:47:34 0.80873  CR      275*20 20.90  0.22  21.5

Photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id    R2
1271-0576219    17.27
1271-0576200    17.52
1271-0576190    18.12
1271-0576101    17.00
1271-0576308    17.05

GCN Circular 19829

Subject
GRB 160816A: TSHAO optical observations
Date
2016-08-21T13:37:01Z (9 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin 
(Fesenkov Astrophysical Institute),  A. Volnova (IKI), A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of 160816A  (Racusin et al., GCN 19802; Mailyan et 
al., GCN 19804)  with Zeiss-1000 (East) 1-m telescope of Tien Shan 
Astronomical Observatory. We obtained several images in R filter 
starting on August 17 and 18.  We detected  optical afterglow (Guidorzi 
et al. GCN 19808; Troja et al. GCN 19809) on Aug. 17 and obtained upper 
limit on Aug. 18. Preliminary photometry of a combined image is following

Date       UT start   t-T0   Filter   Exp.  OT     Err.  UL
                       (mid, days)     (s)

2016-08-17 21:32:28 1.19553  R      105*30 21.70  0.20  21.9
2016-08-18 19:11:47 2.11663  R      148*30 n/d    n/d   22.1


Photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id    R2
1271-0576219    17.27
1271-0576200    17.52
1271-0576190    18.12
1271-0576101    17.00

GCN Circular 19881

Subject
GRB 160816A, the review of the sky area in plate archives
Date
2016-08-29T20:55:56Z (9 years ago)
From
Valentyna Golovnya at Main Astro Obs,Kyiv <golov_v@ukr.net>
V.V. Golovnya, V.M. Andruk (Main Astro Obs., Kyiv) report: We have undertaken the review of the sky area in vicinity of GRB 160816A (Kennea J.A. et al., GCN 19806) on astronegatives, collected in Ukrainian NAS Main astronomical observatory plate archives (1976-1996). All the plates with the possible object appearance are digitized using Epson Expression 10000XL flatbed scanner and have been placed into Golosiiv Plate Archive database DBGPA with open access to them. �������������� The list of plates is given in the table: YYYYMMDD/TimeUT --Plates--�������� Exp.������ Bmag������ Star USNO-A2 19 850822/212139 GUA040C000726�� 18.0������ 16.2������ 1200-18040986 19860712/234442 GUA040C000958�� 16.0������ 16.0������ 1200-18048101 19 860713/000658 GUA040C000959A 16.0������ 16.1������ 1200-18044684 19 860716/233422 GUA040C000967�� 16.0������ 16.6������ 1200-18046182 19 860716/235509 GUA040C000968A 16.0������ 16.6������ 1200-18046182 TimeUT ��� T start of the maximum exposure; Plates - The plates archive identifier of DWA (D/F=40/200,M=103"/mm) GUA040C, of the Ukrainian NAS Main Astro obs, Marsden's number - 83) the plate number (http://gua.db.ukr-vo.org). Exp.�� - Duration of the maximum exposure (minutes). Bmag�� - Limited B mag, derived in the 6 minutes area around ������������ the location GRB 160816A given in P.A. Evans (P. Evans http://www.swift.ac.uk/xrt_positions/00020685/): ������������ RA(J2000)= 21h 29m 38.71s, Dec(J2000)= +37d 07' 58.3" Star USNO-A2 - Comparison star. ��The preview images of 5 areas together with the 6 min.of arc area from Aladin can be found in http://gua.db.ukr-vo.org/img/grb/160816A/index.html. The images with full resolution are available via e-mail on demand.

GCN Circular 19892

Subject
GRB 160816A: Possible radio afterglow detection at 15 GHz with AMI
Date
2016-09-05T20:21:51Z (9 years ago)
From
Kunal Mooley at Oxford U <kunal.mooley@physics.ox.ac.uk>
K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson 
(Curtin), T. Cantwell (Manchester), C. Rumsey, D. Titterington, S. H. 
Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), 
K. Grainge, A. Scaife (Manchester)

We observed the Fermi/LAT GRB 160816A (Racusin et al., GCN 19802) with 
the AMI Large Array at 15 GHz on 2016 Aug 18.02, Aug 19.06, and Sep 
03.02 (UT) as part of the 4pisky program. We detect a possible radio 
afterglow (consistent with the XRT location; Kennea et al., GCN 19806) 
in the second epoch with a peak flux density of 129+/-32 uJy, and 3sigma 
upper limits of 111 uJy and 168 uJy in the first and third epochs 
respectively.

We thank the AMI staff for scheduling these observations. The AMI-GRB 
database is a log of all GRB follow up observations with the AMI, and is 
available at http://4pisky.org/ami-grb/.

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