//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16433 SUBJECT: GRB 140622A: Swift detection of a short burst DATE: 14/06/22 09:50:47 GMT FROM: Scott Barthelmy at NASA/GSFC V. D'Elia (ASDC), S. D. Barthelmy (GSFC), L. Izzo (URoma/ICRA) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 09:36:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140622A (trigger=602278). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 317.152, -14.430 which is RA(J2000) = 21h 08m 37s Dec(J2000) = -14d 25' 48" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of about 0.1 sec. The peak count rate was ~2200 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 09:37:37.9 UT, 93.4 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 317.1730, -14.4193 which is equivalent to: RA(J2000) = 21h 08m 41.53s Dec(J2000) = -14d 25' 09.5" with an uncertainty of 2.6 arcseconds (radius, 90% containment). This location is 82 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. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 5.47 x 10^20 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 96 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 0.07. Burst Advocate for this burst is V. D'Elia (delia AT asdc.asi.it). 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: 16434 SUBJECT: GRB 140622A: Enhanced Swift-XRT position DATE: 14/06/22 16:52:45 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 451 s of XRT Photon Counting mode data and 1 UVOT images for GRB 140622A, 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 = 317.17317, -14.41931 which is equivalent to: RA (J2000): 21h 08m 41.56s Dec (J2000): -14d 25' 09.5" with an uncertainty of 2.6 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16435 SUBJECT: GRB 140622A: GROND Upper limits DATE: 14/06/22 18:07:36 GMT FROM: Corentin Delvaux at MPE M. Tanga, C. Delvaux and J. Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 140622A (Swift trigger 602278; D'Elia et al., GCN #16433) simultaneously in g'r'i'z'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 09:40 UT on June 22, 2014, 0.07 hours after the GRB trigger. They were performed at an average seeing of 1.3 and at an average airmass of 1.23. We do not detect a source within the Swift-XRT error circle reported by D'Elia et al. (GCN #16433) down to the following 3-sigma AB magnitudes: g' > 24.3 mag, r' > 24.3 mag, i' > 24.1 mag, z' > 24.1 mag, J > 21.3 mag, H > 20.9 mag, and K > 19.4 mag. We report the detection of a faint object at the border of the 2.6" Swift-XRT error circle at coordinates RA(J2000) = 21:08:41.73 Dec(J2000) = -14:25:06.5 This object is detected in g', r', i', z' and J and there is no evidence of fading. Its estimated AB magnitudes are g' = 23.4 +/- 0.2 mag, r' = 23.4 +/- 0.2 mag, i' = 22.5 +/- 0.1 mag, z' = 22.2 +/- 0.1 mag, and J = 20.9 +/- 0.3 mag. At this time, we cannot assert that this object is the host galaxy of GRB 140622A. The given limits and magnitudes are derived based on calibrating the images against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.07 mag in the direction of the burst (Schlegel et al. 1998). [GCN OPS NOTE(22jun14): Per author's request, the Subject line was corrected from "140422A" to 140622A".] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16436 SUBJECT: GRB 140622A: RATIR Optical and NIR Observations DATE: 14/06/22 19:55:21 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 short-duration GRB 140622A (D'Elia, et al., GCN 16433) 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 2014/06 22.40 to 2014/06 22.47 UTC (1.2 minutes to 1.70 hours after the BAT trigger), obtaining a total of 1.20 hours exposure in the r and i bands and 0.51 hours exposure in the Z and Y bands. For a source within the Swift-XRT error circle (Osborne, et al., GCN 16434), in comparison with 2MASS, we obtain the following upper limits (3-sigma): r > 23.64 i > 23.49 Z > 19.41 Y > 18.73 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: 16437 SUBJECT: GRB 140622A: VLT/X-shooter redshift DATE: 14/06/22 20:54:43 GMT FROM: Olga Hartoog at U of Amsterdam O.E. Hartoog (API/UvA), D. Malesani (DARK/NBI), R. Sanchez-Ramirez (IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), A.J. Levan (U. of Warwick), J.P.U. Fynbo (DARK/NBI), P.M. Vreeswijk (Weizmann), L. Kaper (API/UvA) report on behalf of the X-shooter GRB collaboration: We observed the field of short GRB140622A (D'Elia et al., GCN 16433) with the VLT X-shooter spectrograph covering a spectral range 3200A to 18000A, with a total exposure time of 2x600s. Observations started at UT 10:10:32, ~34 minutes after the trigger. The slit was positioned on the object at RA(J2000) = 21:08:41.73, Dec(J2000) = -14:25:06.5 identified by Tanga et al. (GCN 16435), at the border of the 2.6" XRT error circle. We detect emission lines from this source at a redshift of z~0.959: H-alpha, H-beta, [OII], [OIII]. It is likely that this is the host galaxy of GRB140622A. A very faint trace is detected redwards of ~7000A. This wavelength coincides with a Balmer jump at the host redshift. We thank the staff at Paranal for their support in obtaining these observations. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16438 SUBJECT: GRB 140622A: An unusual short event, Swift-BAT refined analysis DATE: 14/06/22 21:32:14 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift 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. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+302 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140622A (trigger #602278) (D'Elia, et al., GCN Circ. 16433). The BAT ground-calculated position is RA, Dec = 317.153, -14.412 deg which is RA(J2000) = 21h 08m 36.7s Dec(J2000) = -14d 24' 44.6" with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 57%. The mask-weighted light curve shows a single FRED peak. T90 (15-350 keV) is 0.13 +- 0.04 sec (estimated error including systematics). The time-averaged spectrum from T-0.02 to T+0.13 sec is best fit (chisqr = 0.63) by a black body spectrum with kT = 11.6 ± 1.8 keV. A simple power-law model is a relatively poor fit (chisqr 1.13), with a photon index of 3.08 ± 0.29. A power-law with an exponential cutoff at 44 ± 8 keV nominally fits the data almost as well (chisqr = 0.64) as the black body fit, but the power-law index below the cutoff energy and the normalization are poorly defined. The fluence in the 15-150 keV band using the black body spectrum is (2.7 ± 0.5) x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.45 sec in the 15-150 keV band is 0.6 ± 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. From the BAT spectrum, this event does not appear to be a short hard burst. The quickly fading X-ray lightcurve, however (to be reported in a later circular), does appear consistent with a SHB, and does not appear to be similar to the lightcurves of SGRs or other Galactic sources. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/602278/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16439 SUBJECT: GRB 140622A: Swift-XRT refined Analysis DATE: 14/06/22 21:51:03 GMT FROM: Phil Evans at U of Leicester D.N. Burrows (PSU), J.A. Kennea (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), V. Mangano (PSU) and V. D'Elia report on behalf of the Swift-XRT team: We have analysed 7.3 ks of XRT data for GRB 140622A (D'Elia et al. GCN Circ. 16433), from 103 s to 30.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 16434). The light curve can be modelled with a power-law decay with a decay index of alpha=7.1 (+/-0.9). If the light curve continues to decay with a power-law decay index of 7.1, the count rate at T+24 hours will be 5.3 x 10^-21 count s^-1 The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00602278. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16441 SUBJECT: GRB 140622A: KAIT Optical Upper Limit DATE: 14/06/23 02:35:34 GMT FROM: Weikang Zheng at UC Berkeley WeiKang Zheng, Alexei V. Filippenko, Adam Morgan (UC Berkeley), and S. B. Cenko (NASA/Goddard Space Flight Center) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 140622A (D'Elia et al., GCN 16433) starting at 09:39:22 UT, 198 s after the burst. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per image. We do not detect any new source in our images within the enhanced XRT error circle (Osborne et al., GCN 16434). The typical limiting magnitude of our single clear image is about 19.0 calibrated to USNO B1.0. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16446 SUBJECT: GRB 140622A: Swift/UVOT Upper Limits DATE: 14/06/23 19:35:49 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC) and V. D'Elia (ASDC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140622A 97 s after the BAT trigger (D'Elia et al. GCN Circ. 16433). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 16434) 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 97 246 147 >21.2 u_FC 309 559 246 >20.0 white 97 1358 373 >21.2 v 639 1407 97 >19.6 b 564 1334 78 >20.1 u 309 1309 304 >20.2 w1 688 1285 58 >19.6 m2 663 1260 78 >20.6 w2 614 1383 97 >20.2 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.07 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16448 SUBJECT: GRB 140622A: iTelescope.Net T11 Optical Observation DATE: 14/06/24 11:00:15 GMT FROM: Takanori Sakamoto at AGU D. Kawamura, T. Sakamoto, A. Yoshida (AGU) We observed the field of GRB 140622A detected by Swift (trigger #602278; D'Elia et al., GCN Circ. 16433) with the iTelescope.Net (http://www.itelescope.net) T11 (0.51 m Planewave) telescope located at the New Mexico Skies Observatory (NM, USA). 60 images of 60 sec exposures were taken in the R filter starting from June 22 09:50:33 (UT) about 14.5 minutes after the trigger and stopped on June 22 11:01:25 (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. 16434). The estimated five sigma upper limit of the combined image (total exposure of 3600 sec) is ~18.5 using the USNO-B1 catalog. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16468 SUBJECT: GRB 140622A: TAROT La Silla observatory optical observations DATE: 14/06/28 16:14:27 GMT FROM: Alain Klotz at IRAP-CNRS-OMP 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 140622 detected by SWIFT (trigger 602278) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile. The observations started 23.2s after the GRB trigger (12.7s after the notice). The elevation of the field decreased from 61 degrees above horizon and weather conditions were excellents. Images were not accessible during one week due to a disk access problem. 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+23.2s to t0+83.2s : R > 17.5 The second image is 30.0s exposure in tracking mode: t0+96.6s to t0+126.6s : R > 18.0 We co-added a series of exposures: t0+96.6s to t0+389.1s : R > 18.4 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.