GRB 170112A
GCN Circular 20436
Subject
GRB 170112A: Swift detection of a short burst
Date
2017-01-12T02:17:42Z (8 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
B. Mingo (U Leicester), D. N. Burrows (PSU), C. Gronwall (PSU),
J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC),
F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU)
report on behalf of the Swift Team:
At 02:02:00 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 170112A (trigger=732188). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 15.231, -17.190 which is
RA(J2000) = 01h 00m 56s
Dec(J2000) = -17d 11' 24"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a single-peaked
structure with a duration of about 0.1 sec. The peak count rate
was ~4000 counts/sec (15-350 keV), at ~0.1 sec after the trigger.
The XRT began observing the field at 02:03:02.4 UT, 62.3 seconds after
the BAT trigger. No source was detected in 368 s of promptly downlinked
data. We are waiting for the full dataset to detect and localise the
XRT counterpart.
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 66 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of
the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
BAT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.02.
Burst Advocate for this burst is B. Mingo (bm188 AT le.ac.uk).
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 20438
Subject
GRB 170112A: REM optical/NIR observations
Date
2017-01-12T12:23:09Z (8 years ago)
From
Paolo D'Avanzo at INAF-OAB <paolo.davanzo@brera.inaf.it>
P. D'Avanzo, D. Fugazza, S. Covino, A. Melandri (INAF/OAB) report on behalf of the REM team:
We observed the field of the short GRB 170112A (Mingo et al., GCN 20436) with the 60-cm robotic
telescope REM located at the La Silla Observatory (Chile). The observations started at 02:02:55 UT,
55 seconds after the burst, and were carried out simultaneously in the g, r, i, z and H bands.
A preliminary photometry of the first co-added images indicates that no obvious afterglow candidate
is detected within the Swift/BAT error circle (Mingo et al. GCN 20436) down to the following 3sigma
limiting magnitudes:
r > 18.8 at T-T0 = 763s
H > 18.0 at T-T0 = 730s
Magnitudes are in the AB system and have been calibrated with respect to the 2MASS (H-band)
and APASS (r-band) catalogues.
GCN Circular 20439
Subject
GRB 170112A: MASTER-OAFA (Argentina) early optical observations
Date
2017-01-12T13:50:39Z (8 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar
(OAFA) , National University of San Juan, Argentina
H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina,
A.V.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk,
O. Ershova
Irkutsk State University
V.Yurkov, Yu.Sergienko
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
MASTER robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in OAFA was pointed to the GRB170112A 18 sec after notice time
and 25 sec after trigger time at 2017-01-12 02:02:31 UT. On our first (10s
exposure) set we haven`t found optical transient within SWIFT
BAT error-box (Mingo et al., GCN 20436).
The 5-sigma upper limit has been about 16.04mag
The message may be cited.
The observations made on zenit distance = 54 degrees, galaxy latitude b =
-79 degree.
The moon (100 % bright part) is 30 degrees above the horizon. The distance
between moon and object is 97
The sun altitude is -23.9 degree.
The object can be observed till 2017-01-12 04:57:47
The message may be cited.
GCN Circular 20440
Subject
GRB 170112A: Swift-XRT observations
Date
2017-01-12T14:12:03Z (8 years ago)
From
Beatriz Mingo at U of Leicester,XRT <bm188@le.ac.uk>
A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB),
D.N. Burrows (PSU), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), S.L.
Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester) reports on behalf of the Swift-XRT team:
We have analysed 5.7 ks of Photon Counting (PC) mode XRT data for the
Swift/BAT-detected burst GRB 170112A, collected between T0+73 s and
T0+13.3 ks.
No X-ray sources have been detected consistent with being within 296
arcsec of the Swift/BAT position. The 3-sigma upper limit in the field
ranges from ~0.002 to ~0.003 ct s^-1, corresponding to a 0.3-10 keV
observed flux of 7.8e-14 to 1.1e-13 erg cm^-2 s^-1 (assuming a typical
GRB spectrum).
Six uncatalogued sources were detected too far from the GRB position to
be likely afterglow candidates.
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/00732188.
This circular is an official product of the Swift-XRT team.
GCN Circular 20443
Subject
GRB 170112A: Swift-BAT refined analysis
Date
2017-01-12T23:33:12Z (8 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), N. Gehrels (GSFC),
H. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC),
J. P. Norris (BSU), 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-240 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 170112A (trigger #732188)
(Mingo, et al., GCN Circ. 20436). The BAT ground-calculated position is
RA, Dec = 15.232, -17.233 deg which is
RA(J2000) = 01h 00m 55.7s
Dec(J2000) = -17d 13' 57.9"
with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a single-peaked structure that starts
and peaks at ~T0, and ends at ~T+0.06 s. T90 (15-350 keV) is 0.06 +- 0.02 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.00 to T+0.06 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.17 +- 0.34. The fluence in the 15-150 keV band is 1.3 +- 0.4 x 10^-8 erg/cm2.
The 1-sec peak photon flux measured from T-0.47 sec in the 15-150 keV band
is 0.3 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
Using a 16-ms binned light curve, the lag analysis finds a lag of 19 (-17, +36) ms for
the 100-350 keV to 25-50 keV, -7 (-12, +14) ms for the 50-100 keV to 15-25 keV
band, and 0 (-7, +7) ms for the 50-100 keV to 25-50 keV. These values are
consistent with those of a short GRB. Moreover, no extended emission are found.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/732188/BA/
GCN Circular 20444
Subject
GRB 170112A: RATIR Optical and NIR Observations
Date
2017-01-12T23:48:48Z (8 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),
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 short GRB 170112A (Mingo, et al., GCN 20436)
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 2017/01 12.15 to 2017/01 12.21 UTC (1.58 to
2.95 hours after the BAT trigger), obtaining a total of 0.76 hours
exposure in the r and i bands and 0.32 hours exposure in the Z and Y bands.
Comparison to the DSS reveals no obvious new source brighter than about
magnitude 19. However our data are deeper and we cannot yet exclude a
fainter
counterpart.
Further observations to check for variability are planned.
We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.
GCN Circular 20451
Subject
GRB 170112A: Swift/UVOT Upper Limits
Date
2017-01-13T16:17:42Z (8 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and B. Mingo (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170112A
279 s after the BAT trigger (Mingo et al., GCN Circ. 20436).
No optical afterglow consistent with the BAT position
(Lien et al., GCN Circ. 20443) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 856 1006 147 >20.5
u_FC 279 529 246 >19.9
white 856 6361 344 >21.0
v 5136 6771 393 >19.2
b 5956 6156 197 >20.0
u 279 7338 593 >20.4
w1 5546 7180 393 >19.9
m2 5341 6975 393 >20.2
w2 6366 6566 197 >20.0
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 20472
Subject
GRB 170112A : AbAO optical observations
Date
2017-01-16T19:35:42Z (8 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Pozanenko (IKI), R. Inasaridze (AbAO), A. Volnova
(IKI), V. Ayvazian (AbAO), O.Kvaratskhelia (AbAO), G. Inasaridze
(AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up
collaboration:
We observed the field of short GRB 170112A (Mingo et al., GCN 20436)
with AS-32 (0.7m) telescope of Abastumani Observatory on Jan., 12 (UT)
15:35:30. We obtained several unfiltered images of the field. Within BAT
error circle (Mingo et al., GCN 2043) we found the source which is
absent in USNO-B1.0 at coordinates (J2000) 01:00:49.80 -17:10:17.5 with
uncertainty of 0.9 arcsec in both coordinates.
Finding chart can be found at
http://grb.rssi.ru/GRB170112A/GRB170112A_AAO_170112.png
The source is barely visible in DSS2 (R). Preliminary photometry of
the source is following
Date UT start t-T0 Filter Exp. OT Err UpLim (3 sigma)
(mid, days) (s)
2017-01-12 15:35:30 0.61446 CR 47*60 17.50 0.25 17.7
Photometry is based on nearby USNO-B1.0 stars
USNO-B.1_id R2
0727-0016063 14.46
0728-0016765 15.73
0728-0016759 12.78
0728-0016802 14.33
The source above does not match any source of XRT observation (D'Ai et
al., GCN 20440), see also http://www.swift.ac.uk/ToO_GRBs/00732188/