//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15688 SUBJECT: GRB 140105A: Fermi GBM detection DATE: 14/01/05 21:39:05 GMT FROM: Shaolin Xiong at UAH Shaolin Xiong (UAH) and Valerie Connaughton (UAH) report on behalf of the Fermi GBM Team: "At 01:33:01.01 UT on 05 January 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140105A (trigger 410578384 / 140105065). The on-ground calculated location, using the GBM trigger data, is RA = 208.22, DEC = 50.17 (J2000 degrees, equivalent to 13 h 53 m, 50 d 10 '), with an uncertainty of 6 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 72 degrees. The optical afterglow candidates reported by iPTF (Singer et al. GCN 15686) lie within the 1-sigma (statistical and systematic) uncertainty region surrounding the GBM localization. The GBM light curve consists of weak pulses with a duration (T90) of about 0.8 s (50-300 keV). The time-averaged spectrum from T0-0.064 s to T0+0.64 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.98 +/- 0.11 and the cutoff energy, parameterized as Epeak, is 1200 +/- 500 keV. The event fluence (10-1000 keV) in this time interval is (8.7 +/- 0.6)E-7 erg/cm^2. The 64 ms peak photon flux measured starting from T0 in the 10-1000 keV band is 8.2 +/- 1.2 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: 15692 SUBJECT: GRB 140105A/Fermi410578384: MASTER-Net early optical observations DATE: 14/01/06 14:46:32 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, D.Denisenko, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB140105.06 60 sec after notice time and 21 sec after trigger time at 2014-01-05 01:32:39.028 UT. On our first (10s exposure) set we haven`t found optical transient within our FOW error-box (ra=13 43 08 dec=+52 55 47) . The 5-sigma upper limit has been about 16.8 mag. We have one possible OT candidate iPTF14ae (Singer, Kasliwal and Cenko, GCN 15686) inside our FOV. But we do not see any OT at this place brighter than 16.8 unfiltered magnitude. We have Very Wide Field camera images at this direction (FOV=2x400 square degrees). We have a part of the Error Box at synchronous images (Shaolin Xiong and Valerie Connaughton, GCN 15688). The reduction is being continued. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15694 SUBJECT: GRB 140105A: Swift XRT observations DATE: 14/01/06 22:05:49 GMT FROM: Dirk Grupe at PSU/Swift-XRT Dirk Grupe (Swift MOC, PSU) reports on behalf of the Swift team: We report on the Swift XRT observations of the field of the Fermi GBM detected GRB 140105A (Xiong & Connaughton GCN Circ. 15688). We followed three of the four afterglow candidates reported by Singer et al. (GCN circular 15686). We did not find an X-ray source in any of these observations. Below is a summary of the XRT observations: iPTF14ai: target ID 20338, T-exp=3939s, Tstart = 2014-01-05 19:46 3sigma ul = 1.5e-3 counts/s iPTF14ae: target ID 20339, T-exp=3962s T-start = 2014-01-05 23:01 3sigma ul = 1.53-3 counts/s Note that the bright source in the XRT image is the Seyfert 1 galaxy SBS 1343+537. iPFT14x: target ID 20340, T-exp=3077s T-start = 2014-01-06 08:56 3sigma ul = 2.8e-3 counts/s Note that Swift was not able to observe the field of the forth source, iPTF14ac, because the star tracker did not lock onto the target and caused Swift to go into a safehold. This report is an official product of the Swift team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15696 SUBJECT: GRB 140105A: continued iPTF observations and rejection of optical candidates DATE: 14/01/07 06:03:23 GMT FROM: Leo Singer at CIT/PTF L. P. Singer (Caltech), M. M. Kasliwal (Carnegie Observatories/Princeton), S. B. Cenko (NASA/GSFC), E. Bellm (Caltech), and Y. Cao (Caltech) report on behalf of the intermediate Palomar Transient Factory (iPTF) collaboration: We have continued to observe four optical transients (Singer et al., GCN 15686) in the Fermi GBM error circle for GRB 140105A (Xiong & Connaughton, GCN 15688) with the Palomar 48-inch Oschin telescope (P48), the robotic Palomar 60-inch (P60), and the Palomar 200-inch (P200) equipped with the Double Beam Spectrograph (DBSP). At 33 hours after the burst, with the P48 we obtain the following host-subtracted magnitudes in the Mould R filter: iPTF14x, R = 20.0 iPTF14ac, R = 20.3 iPTF14ae, R = 20.5 With the P60, at 34 hours after the burst, we obtain the following magnitude in the SDSS system: iPTF14ai, r = 20.4 We obtained spectra of all four with the P200. iPTF14x resembles a Type II supernova. Our spectra for iPTF14ac, iPTF14ae, and iPTF14ai show a mostly featureless continuum. The lack of significant optical fading in any of the four candidates strongly argues against association with the GRB. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15697 SUBJECT: GRB 140105A: HCT Observations DATE: 14/01/07 12:28:25 GMT FROM: G.C. Anupama at IIA,Bangalore V. Bhalerao (IUCAA), Vaidehi S. Paliya (IIA), G. C. Anupama (IIA), and C. S. Stalin (IIA) report: We undertook followup observations of the four optical transients (Singer et al., GCN 15686) in the Fermi GBM error circle for GRB 140105A (Xiong & Connaughton, GCN 15688) with the 2-m Himalayan Chandra Telescope (HCT). We obtained two 300s exposures of each field, under non-photometric conditions. 20 hours after the burst, we obtain the following unsubtracted magnitudes in the R band: iPTF14ae = 20.1 +- 0.1 iPTF11ai = 19.8 +- 0.2 iPTF11x = 19.1 +- 0.3 iPTF11ac is contaminated by a nearby star, and we can only place a limit that R > 18.4 mag. We concur with Singer et al. (GCN 15696) that the lack of fading rules out these candidates as counterparts to GRB 140105A. We thank the iPTF team for alerting us about this event. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 15712 SUBJECT: GRB 140105A: MASTER-Net early optical observations and time correction DATE: 14/01/09 17:35:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, D.Denisenko, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov Lomonosov Moscow State University, Sternberg Astronomical Institute A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER VWF robotic very wide field cameras (FOV=2x384 square degrees, D=72mm, f/1.2, 1 pix = 22 arcsec, http://observ.pereplet.ru) installed on MASTER-II robotic telescope syncronously covered ~15% part of 3 sigma FERMI-GBM error box (Xiong et al., GCN 15688). No credible transients have been found on our images. The 3 sigma unfiltered upper limit is 10.6. MASTER-II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB140105A 21 sec after notice time and 45 sec after trigger time at 2014-01-05 01:33:46 UT. After pointing by FERMI alert we cover 90% of 1-sigma and 70% of 3-sigma FERMI-GBM error box. We didn't find new object in error box on single and coadd images. The 3 sigma upper limit on single 5 seconds exposure image is 10.6 and 12.0 on coadd of 24 images with total exposure 120 seconds. The positions of all iPTF optical afterglow candidates (Singer et al., GCN 15686) are covered by out cameras since 48 sec. after the trigger but there are no flares up to 10.6 mag. on their place. The movie is available here http://master.sai.msu.ru/static/GRB/GRB140105A/GRB140105A.gif The map of error box and our FOV is available at http://master.sai.msu.ru/static/GRB/GRB140105A/GRB140105A_map.png The pointing time informations in our previous telegram Gorbovskoy et al. GCN 15692 are not correct. We apologize for this inaccuracy. The message may be cited.