//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13191 SUBJECT: GRB 120403A: Swift detection of a burst DATE: 12/04/03 01:25:54 GMT FROM: Scott Barthelmy at NASA/GSFC A. P. Beardmore (U Leicester), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), V. D'Elia (ASDC), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-OAB/PSU) and C. A. Swenson (PSU) report on behalf of the Swift Team: At 01:05:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120403A (trigger=519211). Swift did not slew because of the Sun observering constraint. The BAT on-board calculated location is RA, Dec 42.459, +40.466 which is RA(J2000) = 02h 49m 50s Dec(J2000) = +40d 27' 57" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single spike with a duration of about 2 sec. The peak count rate was ~2200 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 18:44 UT on 2012 June 25. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is A. P. Beardmore (apb AT star.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: 13195 SUBJECT: GRB 120403A, Swift-BAT refined analysis DATE: 12/04/03 15:30:30 GMT FROM: Takanori Sakamoto at NASA/GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 120403A (trigger #519211) (Beardmore, et al., GCN Circ. 13191). The BAT ground-calculated position is RA, Dec = 42.458, 40.489 deg which is RA(J2000) = 02h 49m 49.8s Dec(J2000) = +40d 29' 21.8" with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%. The mask-weighted light curve shows a single peak, starting at T+0 s, peaking at T+0.1 s and ending at T+1.8 s. T90 (15-350 keV) is 1.25 +- 0.19 sec (estimated error including systematics). The time-averaged spectrum from T+0.0 to T+1.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.64 +- 0.30. The fluence in the 15-150 keV band is 1.0 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 1.1 +- 0.2 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/519211/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13197 SUBJECT: GRB 120403A: MASTER follow up observations DATE: 12/04/03 16:40:05 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, A.Kuznetsov, A.Sankovich Moscow Lomonosov 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.Krushinski, I.Zalozhnich, A. Popov, A. Bourdanov, A. Punanova Ural Federal University 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 Blagoveschensk was pointed to the GRB120403A 35321 sec s after notice time and 36026 sec after GRB time at 2012-04-03 11:05:49.415 UT. On our first (180s exposure) set we haven`t found optical transient within SWIFT error-box (Beardmore et al., GCN Circ 13191). The 5-sigma upper limit has been about 16.0 mag The message may be cited. The long delay was due to the Eath rotation. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 13204 SUBJECT: GRB 120403A: Swift/BAT spectral lag analysis DATE: 12/04/03 23:35:34 GMT FROM: Takanori Sakamoto at NASA/GSFC J. Norris (BSU), T. Sakamoto (GSFC/UMBC), S.D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC) for the BAT Team: We report the spectral lag analysis for GRB 120403A (Beardmore, et al., GCN Circ. 13191) based on the BAT data. Using 64-ms binned light curves, the spectral lag for the 15-25 keV to 50-100 keV bands is 63 +380/-180 msec. Because of a relatively large error in the lag measurement due to a weak nature of the burst, we can not conclusively say that this burst is in the short burst category.