//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20436 SUBJECT: GRB 170112A: Swift detection of a short burst DATE: 17/01/12 02:17:42 GMT FROM: David Palmer at LANL B. Mingo (U Leicester), D. N. Burrows (PSU), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 02:02:00 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170112A (trigger=732188). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 15.231, -17.190 which is RA(J2000) = 01h 00m 56s Dec(J2000) = -17d 11' 24" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 0.1 sec. The peak count rate was ~4000 counts/sec (15-350 keV), at ~0.1 sec after the trigger. The XRT began observing the field at 02:03:02.4 UT, 62.3 seconds after the BAT trigger. No source was detected in 368 s of promptly downlinked data. We are waiting for the full dataset to detect and localise the XRT counterpart. UVOT took a finding chart exposure of 150 seconds with the White filter starting 66 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 25% of the BAT 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 BAT 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 0.02. Burst Advocate for this burst is B. Mingo (bm188 AT le.ac.uk). 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: 20438 SUBJECT: GRB 170112A: REM optical/NIR observations DATE: 17/01/12 12:23:09 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo, D. Fugazza, S. Covino, A. Melandri (INAF/OAB) report on behalf of the REM team: We observed the field of the short GRB 170112A (Mingo et al., GCN 20436) with the 60-cm robotic telescope REM located at the La Silla Observatory (Chile). The observations started at 02:02:55 UT, 55 seconds after the burst, and were carried out simultaneously in the g, r, i, z and H bands. A preliminary photometry of the first co-added images indicates that no obvious afterglow candidate is detected within the Swift/BAT error circle (Mingo et al. GCN 20436) down to the following 3sigma limiting magnitudes: r > 18.8 at T-T0 = 763s H > 18.0 at T-T0 = 730s Magnitudes are in the AB system and have been calibrated with respect to the 2MASS (H-band) and APASS (r-band) catalogues. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20439 SUBJECT: GRB 170112A: MASTER-OAFA (Argentina) early optical observations DATE: 17/01/12 13:50:39 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) , National University of San Juan, Argentina H. Levato, C. Saffe Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE), San Juan, Argentina V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, A.V.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, O. Ershova Irkutsk State University V.Yurkov, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias MASTER robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in OAFA was pointed to the GRB170112A 18 sec after notice time and 25 sec after trigger time at 2017-01-12 02:02:31 UT. On our first (10s exposure) set we haven`t found optical transient within SWIFT BAT error-box (Mingo et al., GCN 20436). The 5-sigma upper limit has been about 16.04mag The message may be cited. The observations made on zenit distance = 54 degrees, galaxy latitude b = -79 degree. The moon (100 % bright part) is 30 degrees above the horizon. The distance between moon and object is 97 The sun altitude is -23.9 degree. The object can be observed till 2017-01-12 04:57:47 The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20440 SUBJECT: GRB 170112A: Swift-XRT observations DATE: 17/01/12 14:12:03 GMT FROM: Beatriz Mingo at U of Leicester,XRT A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: We have analysed 5.7 ks of Photon Counting (PC) mode XRT data for the Swift/BAT-detected burst GRB 170112A, collected between T0+73 s and T0+13.3 ks. No X-ray sources have been detected consistent with being within 296 arcsec of the Swift/BAT position. The 3-sigma upper limit in the field ranges from ~0.002 to ~0.003 ct s^-1, corresponding to a 0.3-10 keV observed flux of 7.8e-14 to 1.1e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum). Six uncatalogued sources were detected too far from the GRB position to be likely afterglow candidates. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00732188. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20443 SUBJECT: GRB 170112A: Swift-BAT refined analysis DATE: 17/01/12 23:33:12 GMT FROM: Amy Lien at GSFC A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), N. Gehrels (GSFC), H. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC), J. P. Norris (BSU), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 170112A (trigger #732188) (Mingo, et al., GCN Circ. 20436). The BAT ground-calculated position is RA, Dec = 15.232, -17.233 deg which is RA(J2000) = 01h 00m 55.7s Dec(J2000) = -17d 13' 57.9" with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a single-peaked structure that starts and peaks at ~T0, and ends at ~T+0.06 s. T90 (15-350 keV) is 0.06 +- 0.02 sec (estimated error including systematics). The time-averaged spectrum from T-0.00 to T+0.06 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.17 +- 0.34. The fluence in the 15-150 keV band is 1.3 +- 0.4 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.47 sec in the 15-150 keV band is 0.3 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. Using a 16-ms binned light curve, the lag analysis finds a lag of 19 (-17, +36) ms for the 100-350 keV to 25-50 keV, -7 (-12, +14) ms for the 50-100 keV to 15-25 keV band, and 0 (-7, +7) ms for the 50-100 keV to 25-50 keV. These values are consistent with those of a short GRB. Moreover, no extended emission are found. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/732188/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20444 SUBJECT: GRB 170112A: RATIR Optical and NIR Observations DATE: 17/01/12 23:48:48 GMT FROM: Eleonora Troja at GSFC Eleonora Troja (GSFC), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of the short GRB 170112A (Mingo, et al., GCN 20436) 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 2017/01 12.15 to 2017/01 12.21 UTC (1.58 to 2.95 hours after the BAT trigger), obtaining a total of 0.76 hours exposure in the r and i bands and 0.32 hours exposure in the Z and Y bands. Comparison to the DSS reveals no obvious new source brighter than about magnitude 19. However our data are deeper and we cannot yet exclude a fainter counterpart. Further observations to check for variability are planned. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20451 SUBJECT: GRB 170112A: Swift/UVOT Upper Limits DATE: 17/01/13 16:17:42 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and B. Mingo (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 170112A 279 s after the BAT trigger (Mingo et al., GCN Circ. 20436). No optical afterglow consistent with the BAT position (Lien et al., GCN Circ. 20443) 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 856 1006 147 >20.5 u_FC 279 529 246 >19.9 white 856 6361 344 >21.0 v 5136 6771 393 >19.2 b 5956 6156 197 >20.0 u 279 7338 593 >20.4 w1 5546 7180 393 >19.9 m2 5341 6975 393 >20.2 w2 6366 6566 197 >20.0 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20472 SUBJECT: GRB 170112A : AbAO optical observations DATE: 17/01/16 19:35:42 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Pozanenko (IKI), R. Inasaridze (AbAO), A. Volnova (IKI), V. Ayvazian (AbAO), O.Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up collaboration: We observed the field of short GRB 170112A (Mingo et al., GCN 20436) with AS-32 (0.7m) telescope of Abastumani Observatory on Jan., 12 (UT) 15:35:30. We obtained several unfiltered images of the field. Within BAT error circle (Mingo et al., GCN 2043) we found the source which is absent in USNO-B1.0 at coordinates (J2000) 01:00:49.80 -17:10:17.5 with uncertainty of 0.9 arcsec in both coordinates. Finding chart can be found at http://grb.rssi.ru/GRB170112A/GRB170112A_AAO_170112.png The source is barely visible in DSS2 (R). Preliminary photometry of the source is following Date UT start t-T0 Filter Exp. OT Err UpLim (3 sigma) (mid, days) (s) 2017-01-12 15:35:30 0.61446 CR 47*60 17.50 0.25 17.7 Photometry is based on nearby USNO-B1.0 stars USNO-B.1_id R2 0727-0016063 14.46 0728-0016765 15.73 0728-0016759 12.78 0728-0016802 14.33 The source above does not match any source of XRT observation (D'Ai et al., GCN 20440), see also http://www.swift.ac.uk/ToO_GRBs/00732188/