GRB 141015A
GCN Circular 16909
Subject
GRB 141015A: Swift detection of a burst
Date
2014-10-15T09:26:18Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>
E. Troja (NASA/GSFC/UMCP), S. D. Barthelmy (GSFC),
M. M. Chester (PSU), P. A. Evans (U Leicester),
K. L. Page (U Leicester), D. M. Palmer (LANL),
J. L. Racusin (NASA/GSFC) and R. L. C. Starling (U Leicester) report
on behalf of the Swift Team:
At 09:12:59 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 141015A (trigger=615399). Swift did not slew because of Moon constraint.
The BAT on-board calculated location is
RA, Dec 87.507, +18.316 which is
RA(J2000) = 05h 50m 02s
Dec(J2000) = +18d 18' 57"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a single peak
with a duration of about 10 sec. The peak count rate
was ~800 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT
position until 15:56 UT on 2014 October 15. There will thus be no XRT
or UVOT data for this trigger before this time.
Burst Advocate for this burst is E. Troja (eleonora.troja 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 16910
Subject
GRB 141015A: Swift/XRT localization
Date
2014-10-15T15:39:14Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>
E. Troja (NASA/GSFC/UMCP), S. D. Barthelmy (GSFC),
M. M. Chester (PSU), P. A. Evans (U Leicester), J. A. Kennea (PSU),
K. L. Page (U Leicester), D. M. Palmer (LANL),
J. L. Racusin (NASA/GSFC), M. H. Siegel (PSU) and
R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
At 09:12:59 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 141015A (trigger=615399). The position was reloaded up to Swift
using the "grb" mode of the TOO command (now that the location is out of Moon
constraint). As such, Swift responds by generating the standard set
of real-time TDRSS messages (and hence the GCN Notices).
We are issuing this Circular with the results from XRT and UVOT.
The XRT began observing the field at 15:07:56.6 UT, 21297.3 seconds
after the BAT trigger. Using promptly downlinked data we find an
uncatalogued X-ray source located at RA, Dec 87.51746, 18.32965 which
is equivalent to:
RA(J2000) = 05h 50m 04.19s
Dec(J2000) = +18d 19' 46.7"
with an uncertainty of 4.0 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 consistent with the Galactic value of 5.59
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 21238 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 large, but uncertain
extinction expected.
Burst Advocate for this burst is E. Troja (eleonora.troja 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 16911
Subject
GRB 141015A: ISON-NM early optical observations
Date
2014-10-15T17:27:15Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov
(KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of the Swift GRB 141015A (Troja et al., GCN
16909) with 0.4-m telescope of ISON-NM observatory starting on Oct., 15
(UT) 09:16:55, i.e. ~4 minutes after burst triger. We obtained 14
unfiltered images of 120 s exposure. We do not detect any source within
XRT error circle (Troja et al., GCN 16910):
UT start t-T0 Exp. Filter UL (3sigma)
(mid.,days) (s)
09:16:55 0.0068 5*120 Clear 18.4
09:16:55 0.0131 14*120 Clear 19.0
The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0 RA DEC R2
1083-0107546 087,552978 +18,360067 14,78
1083-0107529 087,547650 +18,355839 15,18
1083-0107484 087,534895 +18,341425 15,00
1083-0107360 087,503081 +18,336089 14,71
GCN Circular 16912
Subject
GRB 141015A: Super-LOTIS early observations
Date
2014-10-15T17:55:40Z (11 years ago)
From
Adria C. Updike at Roger Williams U <aupdike@rwu.edu>
Adria C. Updike (Roger Williams University) and Dieter H. Hartmann (Clemson University) report on behalf of the AZTEC collaboration:
We observed the field of the Swift GRB 141015A (Troja et al., GCN 16909) with the 0.6-m Super-LOTIS telescope at Kitt Peak National Observatory in Arizona under good conditions. Super-LOTIS began taking images 81 seconds after the trigger and continued for 37 minutes, obtaining 10 sec, 20 sec, and 60 sec images in the R band. We do not detect any source within the XRT error circle (Troja et al., GCN 16910):
UT midtime Exp Time Filter Upper Limit
-------------------------------------------------------------------
09:15:01 4 x 10 sec R 16.5
09:16:50 5 x 20 sec R 17.4
09:23:35 10 x 60 sec R 19.0
with photometry based on the USNO B1.0 catalog.
GCN Circular 16913
Subject
GRB 141015A: Enhanced Swift-XRT position
Date
2014-10-15T18:18:50Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1819 s of XRT Photon Counting mode data and 4 UVOT
images for GRB 141015A, 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 = 87.51892, +18.32940 which is equivalent
to:
RA (J2000): 05h 50m 4.54s
Dec (J2000): +18d 19' 45.8"
with an uncertainty of 2.3 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 16914
Subject
GRB 141015A: RATIR Optical Upper Limits
Date
2014-10-15T18:40:51Z (11 years ago)
From
Owen Littlejohns at Az State U <olittlej@asu.edu>
Owen Littlejohns (ASU), 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), 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 141015A (Troja, et al., GCN 16909) 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 2014/10 15.39 to 2014/10 15.53 UTC (0.05
to 3.59 hours after the BAT trigger), obtaining a total of 2.44 hours
exposure in the r and i bands.
For a source within the Swift/XRT error circle (Troja, et al., GCN 16910),
we obtain the following upper limits (3-sigma):
r > 23.07
i > 22.48
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 16915
Subject
GRB 141015A: LCO-McDonald observations
Date
2014-10-15T20:50:22Z (11 years ago)
From
Andrea Melandri at INAF-OAB <andrea.melandri@brera.inaf.it>
J. Japelj (U. Ljubljana) and C. Guidorzi (U. Ferrara) on behalf of a large collaboration report:
We observed the position of GRB 141015A (Troja et al. GCN Circ. 16909) with the 1-m McDonald telescope (Fort Davis, US), a member of the Las Cumbres Observatory network. Observations started on October 15 at 09:51:01 UT, i.e., 38 minutes after the GRB trigger time (GCN Circ. 16909) and were done with the g', r' and i' filters.
We did not find a new source within the enhanced XRT error circle (Evans et al. GCN Circ. 16913) down to the following limits:
Mid time from Total Exp Filter Magnitude
trigger (min) (s)
-----------------------------------------------------------
54.4 600 r' > 19.6
59.2 600 i' > 18.7
-----------------------------------------------------------
Magnitudes are calibrated against nearby USNO-B1 stars.
GCN Circular 16916
Subject
GRB 141015A: Swift-BAT refined analysis
Date
2014-10-15T22:18:29Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), J. Tueller (GSFC),
T. N. Ukwatta (LANL)
(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 141015A (trigger #615399)
(Troja, et al., GCN Circ. 16909). The BAT ground-calculated position is
RA, Dec = 87.535, 18.370 deg, which is
RA(J2000) = 05h 50m 08.5s
Dec(J2000) = +18d 22' 12.5"
with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 98%.
The mask-weighted light curve shows s single FRED-like pulse starting
at ~T_0, peaking at ~T+1 sec, and ending at ~T+12 sec. T90 (15-350 keV)
is 11.0 +- 4.1 sec (estimated error including systematics).
The time-averaged spectrum from T+0.00 to T+13.00 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.90 +- 0.37. The fluence in the 15-150 keV band is 1.6 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+1.00 sec in the 15-150 keV band
is 0.5 +- 0.1 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/615399/BA/
GCN Circular 16917
Subject
GRB 141015A: MITSuME Okayama upper limits
Date
2014-10-16T06:05:45Z (11 years ago)
From
Daisuke Kuroda at OAO/NAOJ <dikuroda@oao.nao.ac.jp>
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ),
S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto)
and N. Kawai(Tokyo Tech)
report on behalf of MITSuME and OISTER collaboration:
We observed the field of GRB 141015A (Troja et al., GCNC 16909)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2014-10-15 13:44:05 UT, (~4.5 h after the burst).
We did not find any new point source within the enhanced XRT circle
(Evans, GCNC 16913) in all the three bands.
Three sigma upper limits of the OT are listed below.
We used GSC2.3 catalog for flux calibration.
#T0+[day] MID-UT T-EXP[sec] g' Rc Ic
-----------------------------------------------------
0.29816 16:22:18 5760.0 >20.1 >19.8 >19.0
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
GCN Circular 16918
Subject
GRB 141015A: Swift/UVOT Upper Limits
Date
2014-10-16T12:56:09Z (11 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP) report on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141015A
21301 s after the BAT trigger (Troja et al., GCN Circ. 16909).
No optical afterglow consistent with the XRT position (Evans et al. GCN
Circ. 16913) 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 21301 21451 147 >20.5
white 21301 23280 1033 >21.5
v 27071 27978 885 >19.8
b 21461 22368 885 >20.8
w1 28890 29661 759 >20.1
m2 27983 28883 886 >20.3
w2 23286 23906 610 >20.1
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.51 in the direction of the
burst (Schlegel et al. 1998).
GCN Circular 16923
Subject
GRB 141015A: MITSuME Akeno upper limits
Date
2014-10-18T09:26:48Z (11 years ago)
From
Taketoshi Yoshii at Tokyo Tech <yoshii.t.ac@m.titech.ac.jp>
Y. Yano, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi,
S. Kurita, Y. Ono, T. Fujiwara, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 141015A (E. Troja et al., GCN Circular #16909) with the
optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm
telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2014-10-15 14:40:07 UT (~5.5 h after the burst).
We did not find any new point source within the enhanced XRT circle
(P. A. Evans et al., GCN Circular #16913) in all the three bands.
The measured magnitudes are listed below.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
------------------------------------------------------------------------------
31113 18:00:29 1440 >20.7 >20.1 >19.3
------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
GCN Circular 16925
Subject
GRB 141015A: Swift-XRT afterglow confirmation and refined Analysis
Date
2014-10-19T08:10:41Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
E. Troja (NASA/GSFC/UMCP) reports on behalf of the Swift-XRT team:
We have analysed 9.0 ks of XRT data for GRB 141015A (Troja et al. GCN
Circ. 16909), from 21.3 ks to 271.2 ks after the BAT trigger. The
data are entirely in Photon Counting (PC) mode. The enhanced XRT
position for this burst was given by Evans et al. (GCN Circ. 16913).
The GRB light curve in the initial observation was at a level of ~0.02
ct/sec in XRT. In subsequent observations the GRB is undetected, with
an upper limit of 0.004 ct/sec, we therefore confirm that this was the
afterglow of GRB 141015A.
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.38 (+0.51, -0.20). The
best-fitting absorption column is consistent with the Galactic value
of 5.6 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 6.0 x 10^-11 (7.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 5.6 (+/-3.8) x 10^21 cm^-2
Galactic foreground: 5.6 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index: 1.38 (+0.51, -0.20)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00615399.
This circular is an official product of the Swift-XRT team.
GCN Circular 16940
Subject
GRB141015A iTelescope observation
Date
2014-10-22T08:37:23Z (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 141015A detected by Swift (trigger #615399;
Troja et al., GCN Circ. 16909) with the iTelescope.Net (http://www.itelescope.net)
T05 (0.25 m Takahashi Epsilon) telescope located at the New Mexico Skies Observatory
(NM, USA).
20 images of 60 sec exposures were taken in the Red filter starting from October 15
09:37:23 (UT) about 26 minutes after the trigger and stopped on October 5 10:04:00 (UT).
We do not detect the optical afterglow both in the individual images and the stacked
image at the enhanced X-ray afterglow position (Evans et al., GCN Circ. 16913).
The estimated five sigma upper limit of the combined image (total exposure of 1200 sec)
is ~17.1 using the USNO-B1 catalog.
GCN Circular 17066
Subject
GRB 141015A: TAROT La Silla observatory optical observations
Date
2014-11-13T00:47:42Z (11 years ago)
From
Alain Klotz at IRAP-CNRS-OMP <Alain.Klotz@free.fr>
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 141015A detected by SWIFT
(trigger 615399) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory,
La Silla observatory, Chile.
The observations started 55s after the GRB trigger
(19s after the notice). The elevation of the field decreased from
42 degrees above horizon but it was dawn
(sun elevation -11 deg).
The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+55s to t0+115s : R > 12.2
Later images were acquired in tracking mode until 521
seconds after the trigger. We detect no optical afterglow
at Rlim = 12.5
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.