GRB 140710A
GCN Circular 16563
Subject
GRB 140710A: Swift detection of a burst
Date
2014-07-10T10:32:36Z (11 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
M. H. Siegel (PSU), D. N. Burrows (PSU), M. M. Chester (PSU),
H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester) and
D. M. Palmer (LANL) report on behalf of the Swift Team:
At 10:16:40 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 140710A (trigger=603954). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 41.087, +35.493 which is
RA(J2000) = 02h 44m 21s
Dec(J2000) = +35d 29' 36"
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 5 sec. The peak count rate
was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 10:18:18.4 UT, 98.4 seconds after
the BAT trigger. Using promptly downlinked data we find an uncatalogued
X-ray source with an enhanced position: RA, Dec 41.0678, 35.4994 which
is equivalent to:
RA(J2000) = 02h 44m 16.27s
Dec(J2000) = +35d 29' 57.9"
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This
location is 60 arcseconds from the BAT onboard position, within the BAT
error circle. This position may be improved as more data are received;
the latest position is available at http://www.swift.ac.uk/sper. We
cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density in excess of the Galactic value (7.15 x
10^20 cm^-2, Willingale et al. 2013), with an excess column of 7.8
(+5.32/-4.24) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 102 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 100% of
the XRT 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
XRT 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
0.06.
Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu).
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 16565
Subject
GRB 140710A: GROND Detection of NIR Afterglow Candidate
Date
2014-07-10T12:11:39Z (11 years ago)
From
Jochen Greiner at MPI <jcg@mpe.mpg.de>
M. Tanga, C. Delvaux and J. Greiner (all MPE Garching) report on behalf of
the GROND team:
We observed the field of GRB 140710A (Swift trigger 603954; Siegel et al.,
GCN #16563) simultaneously in JHK with GROND (Greiner et al. 2008, PASP
120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory
(Chile).
Observations started at 10:48 UT on 2014-07-10, 0.5 hrs after the GRB
trigger, but already in morning twilight and thus without the optical
GROND channels. Observations were performed at an average seeing of
1.5" and at an average airmass of 2.6.
We found a single point source within the 2.2" Swift-XRT error circle
reported by Siegel et al. (GCN #16563) at
RA (J2000.0) = 02 h 44 m 16.30 s
DEC (J2000.0) = +35d 29' 08.4
with an uncertainty of 0.5" in each coordinate.
Based on 4 min of total exposure we estimate a preliminary magnitude
of about
J(AB) ~ 20.5 mag
The given magnitude is calibrated against 2MASS field stars and is not
corrected for the expected Galactic foreground extinction corresponding
to a reddening of E_(B-V)=0.06 mag in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 16566
Subject
GRB 140710A: correction to GCN #16565
Date
2014-07-10T13:21:04Z (11 years ago)
From
Corentin Delvaux at MPE <delvaux@mpe.mpg.de>
C. Delvaux (MPE Garching) reports:
The coordinates in GCN #16565 should read:
RA (J2000.0) = 02 h 44 m 16.30 s
DEC (J2000.0) = +35d 29' 57.1
Sorry for any confusion caused by this mistake.
GCN Circular 16567
Subject
GRB 140710A: P60 Confirmation of Afterglow
Date
2014-07-10T14:35:19Z (11 years ago)
From
S. Bradley Cenko at NASA/GSFC <brad.cenko@nasa.gov>
S. B. Cenko (NASA/GSFC) and D. A. Perley (Caltech) report on behalf of a larger collaboration:
We observed the location of GRB140710A (Siegel et al., GCN 16563) with the robotic Palomar 60 inch telescope. Observations were obtained in the r', i', and z' filters beginning 3.1 minutes after the Swift trigger time. We detect a faint source within the XRT error circle in all three filters, roughly consistent with the location of the candidate reported by GROND (Tanga et al., GCNs 16565; Delvaux, GCN 16566). Using several nearby point sources from the APASS catalog for calibration, we measure the following AB magnitudes:
r' = 19.90 at dt = 3.6 min
i' = 19.80 at dt = 5.0 min
Over the course of the first hour following the Swift trigger time, the source fades by >~ 1.0 mag in r', confirming that it is indeed the optical afterglow of GRB140710A.
GCN Circular 16568
Subject
GRB 140710A: RATIR Optical and NIR Observations
Date
2014-07-10T14:37:42Z (11 years ago)
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), Chris Klein (UCB), Ori Fox (UCB),
J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara
(ORAU/GSFC), Eleonora Troja (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), and
Harvey Moseley (GSFC) report:
We observed the field of GRB 140710A (Siegel, et al., GCN 16563) 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 2014/07 10.43 to 2014/07 10.47 UTC (3.6
minutes to 1.12 hours after the BAT 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 (see also, Castro-Tirado, et
al., GCN 16564; Tanga, et al., GCN 16565), in comparison with 2MASS, we
obtain the following detections:
r 21.36 +/- 0.08
i 21.10 +/- 0.07
Z 20.77 +/- 0.14
Y 20.42 +/- 0.16
J 20.31 +/- 0.14
H 19.75 +/- 0.13
These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB. The source appears to fade in all
bands.
We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.
GCN Circular 16569
Subject
GRB 140710A: Enhanced Swift-XRT position
Date
2014-07-10T15:44:28Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)
report on behalf of the Swift-XRT team.
Using 528 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 140710A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 41.06775, +35.49908 which is equivalent
to:
RA (J2000): 02h 44m 16.26s
Dec (J2000): +35d 29' 56.7"
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
GCN Circular 16570
Subject
GRB 140710A: Gemini-N redshift of likely host
Date
2014-07-10T15:44:55Z (11 years ago)
From
Nial Tanvir at U.Leicester <nrt3@star.le.ac.uk>
N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick) and
D. Coulson (Gemini) report:
We observed the position of GRB 140710A (Siegel et al.
GCN 16563; Tanga et al. GCN 16565/6; Cenko et al. GCN 16567;
Butler et al. GCN 16568) with the GMOS-N spectrograph on
Gemini-North. Observations began at 14:06 UT, approximately
3.8 hr post burst.
The spectrum shows a faint continuum and emission lines of
OII (3727), Hbeta (4863) and OIII (4959/5007) at a common
redshift of z=0.558. There is also some evidence for a 4000A
break at the same redshift. Given the fading nature already reported,
and the slight extension of the source in the acquisition images,
it is very likely that this is the redshift of the GRB host galaxy, and
that it is already comparable to the afterglow brightness.
GCN Circular 16572
Subject
GRB 140710A: Swift/UVOT Upper Limits
Date
2014-07-10T20:28:33Z (11 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (IAA-CSIC/UCL-MSSL) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140710A
103 s after the BAT trigger (Siegel et al., GCN Circ. 16563).
No optical afterglow consistent with the optical position
(Delvaux et al., GCN Circ. 16566, Tanga et al., GCN Circ. 16565) or the enhanced XRT position
(Osborne et al., GCN Circ. 16569) 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 103 253 147 >20.1
u_FC 315 565 246 >19.2
white 103 5830 363 >20.7
v 644 16380 1090 >19.8
b 570 12165 806 >20.3
u 315 11556 1376 >20.5
w1 4153 17926 1706 >20.7
m2 3948 17285 1245 >20.8
w2 620 6035 216 >19.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.06 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 16573
Subject
GRB 140710A: Swift-BAT refined analysis
Date
2014-07-10T21:46:28Z (11 years ago)
From
Hans Krimm at NASA-GSFC <hans.krimm@nasa.gov>
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
M. H. Siegel (PSU), M. Stamatikos (OSU), J. Tueller (GSFC),
T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 140710 (trigger #603954)
(Siegel, et al., GCN Circ. 16563). The BAT ground-calculated position is
RA, Dec = 41.088, 35.499 deg which is
RA(J2000) = 02h 44m 21.0s
Dec(J2000) = +35d 29' 54.8"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 58%.
The mask-weighted light curve shows a single peak of duration ~4 seconds,
starting at T0. T90 (15-350 keV) is 3.52 +- 0.91 sec (estimated error including
systematics).
The time-averaged spectrum from T-0.23 to T+3.80 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.00 +- 0.23. The fluence in the 15-150 keV band is 2.3 +- 0.3 x 10^-07
erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV
band is 1.9 +- 0.3 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/603954/BA/
GCN Circular 16574
Subject
GRB 140710A: Swift-XRT refined Analysis
Date
2014-07-10T22:32:04Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
D.N. Burrows (PSU), J.A. Kennea (PSU), V. Mangano (PSU), J.P. Osborne
(U. Leicester), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.
Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti
(INAF-OAB/PSU) and M.H. Siegel report on behalf of the Swift-XRT team:
We have analysed 9.4 ks of XRT data for GRB 140710A (Siegel et al. GCN
Circ. 16563), from 83 s to 23.7 ks after the BAT trigger. The data
comprise 8 s in Windowed Timing (WT) mode (taken while Swift was
slewing), with the remainder in Photon Counting (PC) mode. The enhanced
XRT position for this burst was given by Osborne et al. (GCN Circ.
16569).
The late-time light curve (from T0+3.9 ks) can be modelled with a
power-law decay with a decay index of alpha=0.8 (+/-0.3).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.98 (+0.20, -0.19). The
best-fitting absorption column is 3.2 (+0.9, -0.8) x 10^21 cm^-2, in
excess of the Galactic value of 7.2 x 10^20 cm^-2 (Willingale et al.
2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 3.8 x 10^-11 (5.6 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 3.2 (+0.9, -0.8) x 10^21 cm^-2
Galactic foreground: 7.2 x 10^20 cm^-2
Excess significance: 5.1 sigma
Photon index: 1.98 (+0.20, -0.19)
If the light curve continues to decay with a power-law decay index of
0.8, the count rate at T+24 hours will be 3.2 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x
10^-13 (1.8 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00603954.
This circular is an official product of the Swift-XRT team.
GCN Circular 16582
Subject
GRB 140710A: iTelescope.Net T11 Optical Observation
Date
2014-07-13T20:00:23Z (11 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
D. Kawamura, T. Sakamoto, A. Yoshida (AGU)
We observed the field of GRB 140710A detected by Swift (trigger #603954;
Siegel et al., GCN Circ. 16563) with the iTelescope.Net (http://www.itelescope.net)
T11 (0.51 m Planewave) telescope located at the New Mexico Skies Observatory
(NM, USA).
20 images of 60 sec exposures were taken in the R filter starting from July 10 10:35:00 (UT)
about 18 minutes after the trigger and stopped on July 10 10:58:30 (UT). We do not detect
the optical afterglow both in the individual images and the stacked image at the enhanced X-ray
afterglow position (Osborne et al., GCN Circ. 16569). The estimated five sigma upper limit of
the combined image (total exposure of 1200 sec) is ~19.5 using the USNO-B1 catalog.