GRB120402A

This page lists all entries on GRB120402A in GRBweb

Summary GCN 13190 GCN 13196 GCN 13200 GCN 13202

Summary table
Variable Value Source
T0 22:49:22 UTC GCN_circulars,Swift Det
ra 314.3260° GCN_circulars,Swift Det
decl 19.2580° GCN_circulars,Swift Det
GBM_located False
mjd 56019.950949074075 GCN_circulars,Swift Det
GCN 13190 table
GRB_name GRB120402A
GCN_number 13190
Detection_method Swift Det
t_trigger 22:49:22 UTC
ra 314.3260°
decl 19.2580°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13190 SUBJECT: GRB 120402A: Swift detection of a possible burst or noise DATE: 12/04/02 23:10:20 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), V. D'Elia (ASDC), S. T. Holland (STScI), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), O. M. Littlejohns (U Leicester), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), C. J. Mountford (U Leicester), K. L. Page (U Leicester), T. Sakamoto (NASA/UMBC), R. L. C. Starling (U Leicester) and C. A. Swenson (PSU) report on behalf of the Swift Team: At 22:49:22 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120402A (trigger=519207). Swift slewed immediately to the location. The BAT on-board calculated location is RA, Dec 314.326, +19.258, which is RA(J2000) = 20h 57m 18s Dec(J2000) = +19d 15' 28" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single pulse with a duration of about 5 sec. The peak count rate was ~1300 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 22:51:08.6 UT, 105.8 seconds after the BAT trigger. No source was detected in 451 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 109 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 0.12. Given that the BAT image significance is only 6.6 sigma and that the XRT and UVOT do not detect anything, it is unlikely that this is a real GRB. It is possible that this is a noisy detector in the BAT array. We will have to wait for the full data set to downlink to resolve this uncertainty.
GCN 13196 table
GRB_name GRB120402A
GCN_number 13196
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13196 SUBJECT: GRB 120402A: MASTER follow up observations DATE: 12/04/03 16:29:27 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk 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 Kislovodsk was pointed to the GRB120402B 10651 sec s after notice time and 10700 sec after GRB time at 2012-04-03 01:47:42.444 UT. On our first (180s exposure) set we haven't found optical transient within SWIFT error-box (ra=20 57 19 dec=+19 15 36 ). The 5-sigma upper limit has been about 17.4mag The long delay was due to the weather conditions. The message may be cited.
GCN 13200 table
GRB_name GRB120402A
GCN_number 13200
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13200 SUBJECT: GRB 120402A: optical upper limit DATE: 12/04/03 18:48:49 GMT FROM: Alina Volnova at SAI MSU A. Volnova (SAI MSU), E. Litvinenko (UBAI), I. Molotov (KIAM), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the field of the possible GRB 120402A (Swift trigger=519207; Barthelmy et al., GCN 13190) with ORI-40 telescope of Kitab ISON observatory on Apr. 02 starting (UT) 22:55:14, i.e. ~6 min after burst trigger. We obtained several unfiltered images with exposure of 60 seconds. Within BAT error circle of 3 arcmin, radius (Barthelmy et al., GCN 13190) we do not detect apparently new source in comparison with DSS2-red. The photometry is based on USNO-B1.0 reference star 1092-0548647 (20:57:27.42 +19:17:47.2) assuming R = 14.41. Tstart UT, T0+, Filter, Exposure, OT, UL (3 sigma) (mid, d) (s) 22:55:14 0.01449 none 2800 n/d 19.8
GCN 13202 table
GRB_name GRB120402A
GCN_number 13202
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 13202 SUBJECT: BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A DATE: 12/04/03 20:32:51 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/UMBC), C. B. Markwardt (GSFC), and T. Sakamoto (NASA/UMBC) on behalf of the Swift-BAT team The BAT trigger# 519207 (Barthelmy et al, GCN Circ# 13190) has been identified as due to a flare from Cyg X-1, not a GRB. The maskweighted BAT lightcurve for Cyg X-1 shows a single symmetric pulse in the 15-50 keV band, about 4 seconds long at the same time as the BAT trigger. The BAT triggered on the Cyg X-1 flare. While the on-board processing ignores known bright sources, a portion of the Cyg X-1 flare appeared in a spatially separate side-lobe, which the BAT did trigger on.