//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16596 SUBJECT: GRB 140716A found in ground analysis of Swift-BAT data DATE: 14/07/16 18:14:06 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings reports on behalf of the Swift science team: At2014-07-16T10:27:57.3 Swift-BAT rate-triggered on the first episode of GRB 140716. A sub-threshold peak in the image was found for trigger # 604792 at RA, Dec 108.146,-60.130. At 2014-07-16T10:29:26.4, BAT triggered on a second episode. A sub-threshold peak in the image for trigger # 604793 was found at RA, Dec 108.175,-60.153. A combined image shows a bright peak at RA, Dec 108.133 -60.150, which is RA (J2000) 07h 12m 31.9s Dec (J2000) -60d 08' 59" with an estimated 90% confidence radius of 1.5 arcmin. This is consistent with the Fermi GBM position for trigger 427199280 reported at http://gcn.gsfc.nasa.gov/fermi_grbs.html The burst had three main episodes, the first 2 seconds long, the second 4 seconds long at T+90, and the third 6 seconds long at T+100. A Swift TOO request has been submitted. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16598 SUBJECT: GRB 140716A BAT refined analysis DATE: 14/07/16 22:05:17 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings, S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU/NASA/GSFC), J. Tueller (GSFC), T. N. Ukwatta (GWU) on behalf of the Swift-BAT team: We report further analysis of the ground-detected GRB 140716A (Cummings, GCN # 16596) using 20 seconds of photon-event data that cover the first and third peaks, and BAT survey data covering the entire burst. The best BAT position remains RA, Dec 108.133 -60.150, which is RA (J2000) 07h 12m 31.9s Dec (J2000) -60d 08' 59" with an estimated 90% confidence radius of 1.5 arcmin. The source was 3% coded in BAT. The burst had three peaks with similar maximum flux, the first 2 seconds long, the second 4 seconds long at T+90, and the third about 8 seconds long at T+100. The emission was undetectable between the first and second peaks, while there was a slight overlap between peaks 2 and 3. The total T90 was about 104 +- 2 seconds. At T+112 seconds, Swift executed a preplanned slew, putting the source completely out of the BAT coded field of view, but we can say that there was no bright emission above about 50 keV after this time. The average spectrum from 15 to 150 keV is best fit by a simple power law function with a photon index of 1.61 +- 0.33. The total fluence was (5.9 +- 1.2) x 10^-6 ergs/cm^2. The peak 1-second flux was 5.2 +- 1.5 photons/sec/cm^2 from T+0.2 to T+1.2 seconds. All the quoted errors are at the 90% confidence level. A Swift TOO request has been approved and is being executed with the target number 20390. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16599 SUBJECT: GRB 140716A: A Fermi GBM Detection DATE: 14/07/17 00:54:25 GMT FROM: Peter Jenke at MSFC P. Jenke (UAH) and H.-F. Yu (MPE) report on behalf of the Fermi GBM Team: "At 10:27:57.66 UT on July 16 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140716A (trigger 427199280/140716436), which was also detected by Swift (J. R. Cummings et al. 2014, GCN 16596). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the Swift/BAT location. The angle of the burst direction to the Fermi LAT boresight is 137 degrees. The GBM light curve consists of one FRED-like short peak near T0 and a longer double peak at ~T0+100s with a duration (T90) of about 106 s (50-300 keV). The time-averaged spectrum from T0+89s to T0+108s is well fit by a Band function with Epeak = 92 +/- 13 keV, Alpha = -0.8 +/- 0.2 and Beta = -2.07 +/- 0.07. The event fluence (10-1000 keV) in this time interval is (1.03 +/- 0.04)E-05 ergs/cm^2. The 1.0-sec peak photon flux measured starting from T0+100s in the 10-1000 keV band is 11.3 +/- 0.6 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: 16600 SUBJECT: GRB 140716A: Swift-XRT detection of an afterglow candidate DATE: 14/07/17 06:26:30 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: We have analysed 3.4 ks of XRT data for the Swift/BAT ground-detected burst: GRB 140716A (Cummings, GCN Circ 16596; Cummings et al., GCN Circ. 16598), from 34.1 to 56.8 ks after the first of the ground-detected BAT triggers. This burst was also detected by Fermi-GBM (Jenke & Yu, GCN Circ. 16599). The data are entirely in Photon Counting (PC) mode. We detect an uncatalogued X-ray source with a mean count rate of 0.024 (+/- 0.003) count s^-1, at a position of RA, Dec = 108.1731, -60.1757, which is equivalent to: RA (J2000): 07h 12m 41.53s Dec (J2000): -60d 10' 32.7" with an uncertainty of 4.7" (radius, 90% confidence). This is 1.95' from the BAT position, a little outside the 1.5' 90% BAT error circle. We cannot determine at the present time whether the source is fading. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16601 SUBJECT: GRB 140716A: GROND afterglow candidate DATE: 14/07/17 12:21:55 GMT FROM: Sebastian Schmidl at TLS Tautenburg F. Knust, J. Bolmer (both MPE Garching), S. Schmidl (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 140716A (Swift trigger 604792; Cummings et al., GCN 16596) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 10:16 UT on July 17, 2014, 23.8 hrs after the GRB trigger. They were performed at an average seeing of 1.8" and at an average airmass of 2.3. We find a faint source inside the XRT error circle given in Page et al. (GCN 16600) at coordinates RA (J2000.0) = 07:12:41.20 DEC (J2000.0) = -60:10:35.3 with an uncertainty of 0.5" in each coordinate. Based on a total exposures of 264 seconds in g'r'i'z' and 240 seconds in JHK, at a mid-time of 23.9 hrs after the burst, we measure the following preliminary magnitudes (all in AB): g' = 21.5 +/- 0.1, r' = 21.0 +/- 0.1, i' = 20.9 +/- 0.1, z' = 20.6 +/- 0.1, J > 20.1, H > 19.6 and K > 18.7. At present we cannot decide if the source is fading. Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.13 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16604 SUBJECT: GRB 140716A: Swift/UVOT Upper Limits DATE: 14/07/17 20:23:33 GMT FROM: Lea Hagen at PSU L. M. Z. Hagen (PSU) and K. L. Page (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140716A 34072 s after the BAT trigger (Cummings, GCN Circ. 16596). No optical afterglow consistent with the XRT candidate (Page, GCN Circ. 16600) or GROND candidate (Knust et al., GCN Circ. 16601) 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 initial exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag u (fc) 34072 34367 291 >19.17 u 40452 56904 1860 >20.20 v 40559 57641 1125 >19.52 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.131 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16605 SUBJECT: Konus-Wind observation of GRB 140716A DATE: 14/07/18 20:25:13 GMT FROM: Dmitry Svinkin at Ioffe Institute S. Golenetskii, R. Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report: A long duration GRB 140716A (Swift-BAT: Cummings, GCN 16596; GCN 16598; Fermi-GBM: Jenke and Yu, GCN 16599) triggered Konus-Wind at T0=37676.966 s UT (10:27:56.966). The burst light curve shows three emission episodes, the first at ~T0, the second double pulse episode at ~T0+90 s, and the third weak at ~T0+167 s. The total duration of the burst is ~170 s. The emission is seen up to ~1 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140716_T37676/ As observed by Konus-Wind, the burst had a fluence of 9.4(-1.6,+2.2)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.354 s, of 2.8(-0.8,+1.1)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+114.944 s) is best fit in the 20 keV - 2 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.09 (-0.38,+0.51) and Ep = 157 (-41,+84) keV (chi2 = 60/58 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.2 (chi2 = 60/57 dof) The spectrum near the maximum count rate (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 2 MeV range by a power law with exponential cutoff model with alpha = -1.09 (-0.41,+0.68) and Ep = 196 (-72,+174) keV (chi2 = 58/58 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16614 SUBJECT: GRB 140716A: GROND confirmation of the afterglow DATE: 14/07/20 14:54:05 GMT FROM: Sebastian Schmidl at TLS Tautenburg J. Bolmer, F. Knust (both MPE Garching), S. Schmidl (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team: We re-observed the field of GRB 140716A (Swift trigger 604792; Cummings et al., GCN 16596) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile). Observations started on July 20, 2014, at 09:47 UT, 3.97 days after the GRB trigger. They were performed at an average seeing of 1.8" and at an average airmass of 2.3. Based on a total exposure of 1782 seconds in g'r'i'z', we measure for the optical afterglow candidate reported by Knust et al. (GCN #16601) the following preliminary magnitudes (all AB): g' = 22.9 +/- 0.2 mag, r' = 22.0 +/- 0.1 mag, i' = 21.7 +/- 0.2 mag and z' = 21.2 +/- 0.2 mag. Compared to the first-epoch observations the source has faded in all bands, confirming that this is the optical afterglow of GRB 140716A. Given magnitudes are calibrated against GROND zeropoints and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.13 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16616 SUBJECT: GRB 140716A: Confirmation of the Swift-XRT afterglow DATE: 14/07/21 13:54:29 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: Following the detection of an X-ray afterglow candidate for GRB 140716A (Page, GCN Circ. 16600), Swift obtained a second epoch of observations starting 357 ks after the BAT detection. The X-ray source has now faded to a level of (1.4 +0.8/-0.6) x 10^-3 count s^-1, and the light curve can be modelled with a power-law decay with a decay index of alpha=1.16 (+0.39, -0.27). We therefore confirm that this is the X-ray afterglow of GRB 140716A. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020390. This circular is an official product of the Swift-XRT team.