GRB 140118A
GCN Circular 15748
Subject
GRB 140118A: Swift detection of a burst
Date
2014-01-18T01:40:21Z (11 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), J. A. Kennea (PSU), V. Mangano (PSU),
C. B. Markwardt (NASA/GSFC), C. Pagani (U Leicester),
K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and
T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 01:32:02 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 140118A (trigger=584136). Swift did not slew to the burst
because the location is sun-constrained. The BAT on-board calculated
location is RA, Dec 331.003, -17.948 which is
RA(J2000) = 22h 04m 01s
Dec(J2000) = -17d 56' 50"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a broad triangle-
shaped peak structure with a duration of about 40 sec. The peak count
rate was ~1200 counts/sec (15-350 keV), at ~3 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 07:34 UT on 2014 April 03. There will thus be no XRT or
UVOT data for this trigger before this time.
Burst Advocate for this burst is H. A. Krimm (hans.krimm 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 15750
Subject
GRB 140118A, Swift-BAT refined analysis
Date
2014-01-18T15:15:04Z (11 years ago)
From
Hans Krimm at NASA-GSFC <hans.a.krimm@nasa.gov>
A. Y. Lien (NASA/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), 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 140118A (trigger #584136)
(Krimm, et al., GCN Circ. 15748). The BAT ground-calculated position is
RA, Dec = 330.999, -17.937 deg which is
RA(J2000) = 22h 03m 59.8s
Dec(J2000) = -17d 56' 14.1"
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 41%. The mask-weighted light curve shows a
double-peaked structure of two triangular shaped peaks. The first
runs from T-70 to T-20 and the second, stronger peak from T-20 to T+30.
T90 (15-350 keV) is 84.15 +- 10.79 sec (estimated error including systematics).
The time-averaged spectrum from T-73.61 to T+30.87 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.87 +- 0.13. The fluence in the 15-150 keV band is 2.6 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+2.98 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/584136/BA/
GCN Circular 15751
Subject
GRB 140118A: Fermi GBM observation
Date
2014-01-18T15:47:14Z (11 years ago)
From
Shaolin Xiong at UAH <sx0002@uah.edu>
Shaolin Xiong (UAH) reports on behalf of the Fermi GBM Team:
"At 01:32:07.85 UT on 18 January 2014, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 140118A (trigger 411701530 / 140118064),
which was also detected by the Swift/BAT (Krimm et al., GCN 15748;
Lien et al., GCN 15750).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 90 degrees.
The GBM light curve consists of two separate pulses
with a duration (T90) of about 92 s (50-300 keV).
The time-averaged spectrum from T0-74 s to T0+23 s is
adequately fit by a simple power law function with index -1.89 +/- 0.05.
The event fluence (10-1000 keV) in this time interval is
(6.0 +/- 0.4)E-6 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-2.05 s in the 10-1000 keV band
is 2.5 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 15752
Subject
GRB 140118A: RATIR Optical and NIR Observations
Date
2014-01-18T15:48:58Z (11 years ago)
Edited On
2024-11-07T19:38:47Z (7 months ago)
From
Nat Butler at Az State U <natbutler@asu.edu>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
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), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús
González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and
Harvey Moseley (GSFC) report:
We observed the field of GRB 140118A (Krimm, et al., GCN 15748) 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 2014/01 18.09 to 2014/01 18.10 UTC (39.6 to
53.4 minute after the BAT trigger), obtaining a total of 7.8 minutes
exposure in the r and i bands and 4.2 minutes exposure in the Z, Y, and J
bands through high airmass.
We detect no new, uncatalogued sources in the refined Swift BAT error box
(Lien et al., GCN 15750). In comparison with 2MASS, we obtain the
following 3-sigma upper limits:
r > 19.93
i > 19.37
Z > 19.06
Y > 18.99
J > 18.32
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.
GCN Circular 15753
Subject
GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations
Date
2014-01-18T18:24:52Z (11 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@physics.unc.edu>
A. Trotter, D. Reichart, A. Verveer, T. Spuck, A. LaCluyze, J. Haislip,
A. Foster, N. Frank, K. Ivarsen, J. Moore, M. Nysewander, R. Beauchemin,
T. Berger, M. Carroll, H. T. Cromartie, R. Egger, M. Hinckle, A.
Ireland, M. Maples, L. Scott, and J. A. Crain report:
Skynet observed the Swift-BAT localization of GRB 140118A/transient
source MAXI J1421-613 (Baumgartner et al., GCN 15749, Swift trigger
584155) with one 24" and four 14" telescopes of the PROMPT array at
Cerro Tololo, Chile, with two 14" telescopes of the PROMPT array at
Siding Springs, Australia, and with the 14-inch R-COP telescope at Perth
Observatory, Australia. Observations began 86s after the trigger,
simultaneously in the BVRI bands. We detect no uncatalogued optical
source in the refined Swift-BAT error circle (Lien et al., GCN 15750).
In stacks of exposures, we obtain the following upper limits:
Mean Time Band Limit
10.8m I >19.6
14.9m R >19.1
11.7m V >19.8
14.9m B >19.1
6.94h I >17.3
7.10h R >16.9
6.02h V >20.4
6.04h B >20.4
Photometry is calibrated to five APASS-DR7 stars in the field, and has
not been corrected for the extremely significant Galactic foreground
extinction corresponding to E(B-V)=10.5 (Schlegel et al. 1998).
No further Skynet observations are scheduled.