//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 18564 SUBJECT: GRB 151107A: Swift detection of a possible burst DATE: 15/11/07 17:39:22 GMT FROM: David Palmer at LANL A. Y. Lien (GSFC/UMBC), S. B. Cenko (GSFC), N. Gehrels (NASA/GSFC) and K. L. Page (U Leicester) report on behalf of the Swift Team: At 17:19:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 151107A (trigger=662757). Swift could not slew to the burst due to an observing constraint. The BAT on-board calculated location is RA, Dec 217.139, -59.680 which is RA(J2000) = 14h 28m 33s Dec(J2000) = -59d 40' 46" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual for an image trigger, the immediately-available BAT lightcurve shows no obvious activity. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 15:26 UT on 2015 December 12. There will thus be no XRT or UVOT data for this trigger before this time. We note that this location is within a degree of the Galactic plane, so this may be a Galactic transient. Further determination of the nature of the source will require the full downlinked dataset. Burst Advocate for this burst is A. Y. Lien (amy.y.lien 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: 18565 SUBJECT: GRB 151107A: MASTER-NET optical observations DATE: 15/11/07 19:56:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 E. Gorbovskoy, V. Lipunov, N.Tyurina, V.Kornilov, P.Balanutsa, A.Kuznetsov, D.Kuvshinov, D. Vlasenko, E.Popova Lomonosov Moscow State University, Sternberg Astronomical Institute K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk 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 V.Krushinski, I.Zalozhnih 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-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru), located in SAAO, received Swift GRB 151107A at the sunset, when the Sun altitude was -3.4 degrees, GRB altitude was 18.4 degrees. MASTER-SAAO was pointed to the GRB151107A 1750 sec after notice time and 2141 sec after trigger time at 2015-11-07 17:55:20 UT (Sun Altitude: -10.34, Alert altitude: 14.75). On our images (180s exposure) we haven`t found optical transient within SWIFT error-box (ra=14 28 33 dec=-59 40 46 r=0.05). The 5-sigma upper limit has been about 17.2mag. There is a bright star near the BAT coordinates. GRB is setting. The best single image was started at 2015-11-07 18:49:45 (exp 180) m_lim = 18.3 mag. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 18568 SUBJECT: GRB 151107A, Swift-BAT refined analysis DATE: 15/11/08 17:04:20 GMT FROM: Amy Lien at GSFC S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 151107A (trigger #662757) ( Lien et al., GCN Circ. 18564). The BAT ground-calculated position is RA, Dec = 217.139, -59.680 deg which is RA(J2000) = 14h 28m 33.4s Dec(J2000) = -59d -40' -46.9" with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows no obvious structure. The event starts before the beginning of captured data at T-239 sec and extends out past the end of collected event data at T+910 sec when the source location left the FoV when the spacecraft slewed to a new target. This burst occurred during the period of recovering the thermal control system (Barthelmy et al., GCN Circ. 18562). The CZT bias voltage has been reduced to -150v (instead of the normal -200v) and as such the energy scale is not fully calibrated. Therefore, an accurate spectral analysis is unavailable. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/662757/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 18571 SUBJECT: GRB 151107A: Further investigation of the source nature DATE: 15/11/09 22:06:51 GMT FROM: Amy Lien at GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), and D. M. Palmer (LANL) report on behalf of the Swift-BAT team: We perform further investigation regarding the uncertainty of the source nature of GRB151107A (Lien et al., GCN Circ. 18564) due to its proximity to the Galactic plane (within 1 deg) and the featureless light curve. Using analysis from the BAT transient monitor (Krimm et al., 2013), there is no significant emission in the 15-50 keV band at ~ 4000 s before and ~ 6000 s after the event data (signal-to-noise ratio < 1.8 sigma). The source was out of the field of view for the immediate time outside the event data range due to pre-planned telescope slews. A search in the daily mosaic images at the burst location shows a 4-sigma detection on Nov. 7 (12.5 mCrab) and 1.6 sigma on Nov. 8 (which corresponds to a 1-sigma upper limit of ~ 5 mCrab). This flux level and time profile are consistent with a GRB, and appear dimmer and shorter than a usual accreting binary source during outburst. However, we cannot rule out other possible Galactic transients, such as thermonuclear bursts or flaring stars. In addition, we note that within 20.3 arcsec of the revised BAT position is the bright M2/M3 type star designated HD 126577. It is possible that the BAT detections correspond to a flaring episode from HD 126577, although this star is not known for such episodes.