//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12173 SUBJECT: GRB 110719A: Swift detection of a burst DATE: 11/07/19 06:22:14 GMT FROM: David Palmer at LANL T. Sakamoto (NASA/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (NASA/UMBC), M. De Pasquale (UCL-MSSL), C. Guidorzi (U Ferrara), O. M. Littlejohns (U Leicester), C. B. Markwardt (NASA/GSFC), S. R. Oates (UCL-MSSL), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), A. Rowlinson (U Leicester), C. J. Saxton (UCL-MSSL) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 06:09:11 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110719A (trigger=457553). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 24.564, +34.572 which is RA(J2000) = 01h 38m 15s Dec(J2000) = +34d 34' 20" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single noisy FRED structure with a duration of about 50 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~T-1 sec after the trigger. The XRT began observing the field at 06:11:03.1 UT, 111.3 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 24.5799, +34.5869 which is equivalent to: RA(J2000) = 01h 38m 19.17s Dec(J2000) = +34d 35' 12.8" with an uncertainty of 5.6 arcseconds (radius, 90% containment). This location is 71 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. UVOT took a finding chart exposure of 150 seconds with the White filter starting 121 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 0.04. Burst Advocate for this burst is T. Sakamoto (Taka.Sakamoto 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: 12175 SUBJECT: GRB 110719A: Swift-BAT refined analysis DATE: 11/07/19 14:59:21 GMT FROM: Scott Barthelmy at NASA/GSFC W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 110719A (trigger #457553) (Sakamoto, et al., GCN Circ. 12173). The BAT ground-calculated position is RA, Dec = 24.570, 34.578 deg, which is RA(J2000) = 01h 38m 16.8s Dec(J2000) = +34d 34' 39.0" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 30%. The mask-weighted light curve shows a FRED-like peak starting at ~T-5 sec, peaking at ~T+1 sec, and returning to background around T+95 sec. T90 (15-350 keV) is 41.0 +- 7.4 sec (estimated error including systematics). The time-averaged spectrum from T-2.0 to T+42.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.63 +- 0.15. The fluence in the 15-150 keV band is 1.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.02 sec in the 15-150 keV band is 1.3 +- 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/457553/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12176 SUBJECT: GRB 110719A: Enhanced Swift-XRT position DATE: 11/07/19 15:43:09 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 1852 s of XRT Photon Counting mode data and 1 UVOT images for GRB 110719A, 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 = 24.58085, +34.58616 which is equivalent to: RA (J2000): 01h 38m 19.40s Dec (J2000): +34d 35' 10.2" with an uncertainty of 2.5 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: 12177 SUBJECT: GRB 110719A: optical upper limit DATE: 11/07/19 15:54:18 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (SAI MSU), L. Elenin (ISON), I. Molotov (ISON), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 110719A (Sakamoto et al. GCN 12173) with 0.45-m telescope Ïf ISON-NM observatory on July 19 starting (UT) 06:54:39. We took 30 unfiltered images. In a stacked image we do not detect any source within enhanced XRT error circle (Goad et al., GCN 12176) up to 19.7m. The photometry is based on the USNO-B1.0 1245-0023215 star (RA=01:38:11.95, Dec=+34:35:52.6) assuming R=13.72. T0+ Filter, Exposure, OT, Upper Limit (mid, d) (s) 0.04370 none 30x60s n/d 19.7 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12178 SUBJECT: GRB 110719A: Swift-XRT refined Analysis DATE: 11/07/19 15:57:30 GMT FROM: Claudio Pagani at U of Leicester C. Pagani (U. Leicester) and T. Sakamoto (NASA/UMBC) report on behalf of the Swift-XRT team: We have analysed 4.5 ks of XRT data for GRB 110719A (Sakamoto et al. GCN Circ. 12173), from 117 s to 12.1 ks after the BAT trigger. The data comprise 258 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 12176). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=0.59 (+0.26, -0.30). At T+219 s the decay steepens to an alpha of 2.6 (+/-0.4) before breaking again at T+1393 s to a final decay with index alpha=0.7 (+0.7, -0.6). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.39 (+0.13, -0.12). The best-fitting absorption column is 9.0 (+3.8, -3.4) x 10^20 cm^-2, in excess of the Galactic value of 4.0 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.58 (+0.26, -0.15) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.6 x 10^-11 (4.9 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 4.0 (+5.9, -0) x 10^20 cm^-2 Galactic foreground: 4.0 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 1.58 (+0.26, -0.15) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00457553. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12180 SUBJECT: Swift/UVOT observations of GRB110719A DATE: 11/07/19 18:18:06 GMT FROM: Massimiliano de Pasquale at MSSL-UCL M. De Pasquale, C.J. Saxton (MSSL-UCL) and T. Sakamoto (NASA/UMBC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 110719A 121 s after the BAT trigger (Sakamoto et al., GCN Circ. 12173). No optical afterglow consistent with the XRT position (Pagani et al., GCN Circ. 12173) is detected in the initial UVOT exposures and in the summed exposures taken in all filters. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 121 271 147 >20.2 u_FC 279 529 246 >19.2 white 121 17904 1080 >21.3 v 4848 10563 1143 >20.2 b 535 17151 1101 >21.1 u 279 16239 1328 >20.5 w1 5258 12124 836 >20.4 m2 5053 11468 1082 >20.8 w2 4643 6280 393 >20.2 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.04 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12181 SUBJECT: GRB 110719A: z-band upper limit DATE: 11/07/19 18:51:56 GMT FROM: Stefano Covino at Brera Astronomical Observatory Andrew J. Levan (Univ. Warwick), Stefano Covino, Andrea Melandri (INAF/ OABr), Daniele Malesani, Antonio de Ugarte Postigo, Johan P.U. Fynbo (DARK/NBI), report on behalf of the X-shooter GRB GTO collaboration: We observed the field of GRB 110719A (Sakamoto et al., GCN 12173) with the ESO VLT equipped with X-shooter. We could only take a short acquisition image, with mean time 2011 July 19.42 UT (3.95 hr after the GRB). No new object is detected within the refined XRT error circle (Goad et al., GCN 12176), down to a limiting magnitude z > 22.5 (AB), calibrated against SDSS stars in the field. We note that the inferred limit on the broad-band spectral slope is beta_OX < 0.64 (computed between the z band and 1 keV). Given the hard X-ray spectral slope beta_X = 0.58 (Pagani et al., GCN 12178), our non detection is consistent with the extrapolation of the X-ray spectrum. Our data do not allow to classify GRB 110719A as dark. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12182 SUBJECT: GRB 110719A: optical limit by "Pi of the Sky" DATE: 11/07/19 20:08:19 GMT FROM: Marcin Sokolowski at Soltan Inst. Nuc Studies,Warsaw M.Sokolowski,T.Batsch,A.Majcher,A.Majczyna,K.Nawrocki,J.Uzycki,G.Wrochna (IPJ, Swierk), M.Cwiok,W.Dominik,L.W.Piotrowski,A.F.Zarnecki (University of Warsaw), K.Malek,L.Mankiewicz,R.Opiela,M.Siudek,V.Repei (CFT PAN), G.Kasprowicz,M.Zaremba (Warsaw University of Technology), from the "Pi of the Sky" collaboration ( http://grb.fuw.edu.pl ). The wide field "Pi of the Sky South" apparatus, installed in the private observatory of Alain Maury in San Pedro de Atacama ( http://grb.fuw.edu.pl/pi/index.html#spda_site.htm ) has observed the position of GRB 110719A 105s after the GRB. No new object has been found within the Swift-XRT error box. t_start - t0 start (UT) end (UT) 3-sigma limit 105sec 06:10:56 06:11:06 UT 11.0 mag The field was observed until 06:29:34 UT, no new object brighter then 11.0 mag was observed. The limit on 20 coadded images is 11.5 mag. We acknowladge great support received from Alain Maury at SPdA Observatory. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12183 SUBJECT: GRB 110719A: GRT Optical Observation DATE: 11/07/19 21:39:46 GMT FROM: Takanori Sakamoto at NASA/GSFC T. Sakamoto (UMBC/GSFC), D. Donato (UMD/GSFC), N. Gehrels (GSFC), T. Okajima (GSFC), Y. Urata (NCU) We observed the field of GRB 110719A detected by Swift (trigger #457553; Sakamoto et al., GCN Circ. 12173) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/). A total 127 images of 5 sec exposures were taken in the R filter starting from July 19 06:11:29 (UT), about 137 seconds after the trigger (92 seconds after the BAT position notice), and stopped on July 19 06:31:01 (UT). We do not detect the optical afterglow both in the individual images and the stacked image inside the XRT error circle (Goad et al., GCN #12176). The estimated five sigma upper limit of the combined image (total exposure of 635 sec) is ~18.2 mag using the USNO-B1 catalog. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 12189 SUBJECT: GRB 110719A / SMA 345 GHz upper limits DATE: 11/07/21 20:55:07 GMT FROM: Ashley Zauderer at CfA A. Zauderer, G. Petitpas and E. Berger (Harvard/CfA) report on behalf of a larger collaboration: "We observed GRB 110719A (GCN #12173) with the SMA at 345 GHz starting on 2011 July 19.6 (7.5 hours after the burst) for a total integration time on source of 4.6 hours. No counterpart is detected within the XRT error circle (GCN #12176) to a 3-sigma upper limit of 2.1 mJy/bm. We acknowledge and thank the SMA observatory staff for their support of these rapid response observations."