//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15748 SUBJECT: GRB 140118A: Swift detection of a burst DATE: 14/01/18 01:40:21 GMT FROM: David Palmer at LANL 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.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15750 SUBJECT: GRB 140118A, Swift-BAT refined analysis DATE: 14/01/18 15:15:04 GMT FROM: Hans Krimm at NASA-GSFC 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/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15751 SUBJECT: GRB 140118A: Fermi GBM observation DATE: 14/01/18 15:47:14 GMT FROM: Shaolin Xiong at UAH 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." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15752 SUBJECT: GRB 140118A: RATIR Optical and NIR Observations DATE: 14/01/18 15:48:58 GMT FROM: Nat Butler at Az State U 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15753 SUBJECT: GRB 140118A/MAXI J1421-613: Skynet PROMPT/R-COP observations DATE: 14/01/18 18:24:52 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet 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.