a gamma ray burst lasting about 40 s has been detected by IBAS in the IBIS/ISGRI data at 02:41:40 UT of May 12. Due to the 7.3 sigma statistical significance of the detection, only an Alert Packet of WEAK type was distributed in real time (Packet n. 6550). With an off-line analysis with the standard OSA software we obtained the following GRB coordinates (J2000): RA: 325.558 [degrees] DEC...Full Text

As part of a campaign to detect faint nearby GRBs, BAT has lowered its threshold to events near to known sources and nearby Galaxies. At 16:53:59 UT, the Swift Burst Alert Telescope (BAT) triggered at this lower threshold in the vicinity of the known source IGR J17091-3624. Swift slewed immediately to the location. The BAT on-board calculated location is RA, Dec 257.313, -36.282 which is ...Full Text

We observed the field of GRB 120514A (Mangano et al., GCN 13289) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile). Observation started at 03:39 UT, 2.4 h after the trigger and ended at 11:10 UT. We detect two sources just outside of the enhanced 1.8" XRT error circle at RA,DEC 18:52:00.1, -04...Full Text

The Swift/UVOT began settled observations of the field of GRB 120514A 110 s after the BAT trigger (Mangano et al., GCN 13289). No optical afterglow consistent with the enhanced XRT position (Evans et al., GCN 13292) 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...Full Text

"We obtained K-band observations of GRB 120514A (Mangano et al. GCN 13289) with the United Kingdom Infrared Telescope (UKIRT) on Mauna Kea, with a midpoint approximately 12 hours after the initial burst detection. Comparison of a preliminary reduction of these images with archival images taken as part of the UKIRT Galactic Plane Survey (GPS; Lucas et al. 2008 MNRAS 391 136) does not reveal any new...Full Text

The long GRB 120510A localized by MAXI/GSC (Serita et al., GCN 13282) was detected by Konus-Wind in the waiting mode. The burst light curve shows several pulses with a total duration of ~130 s. As observed by Konus-Wind, the burst had a fluence of (3.82 +/- 0.26)x10^-6 erg/cm2 (in the 20 - 1200 keV energy range). Fitting the K-W 3-channel time-integrated spectrum (from T0(MAXI)+5 s to T0(MAXI)+135...Full Text

We have analysed 6.5 ks of XRT data for GRB 120514A (Mangano et al. GCN 13289), from 90 s to 28.8 ks after the BAT trigger. The data comprise 132 s in Windowed Timing (WT) mode (the first 10 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 13292). The late-time light curve (from...Full Text

We have observed the field of GRB 120514A (Mangano et al. GCN 13289) using LABOCA/APEX at Chajnantor (Chile) in the 870 micrometer band. The weather conditions were good, with precipitable water vapour at the time of the observation of ~0.5mm. Observations began on May 14 at 4:55 UT (3.7 hr after the burst) and were performed using the photometric mode, centred at the enhanced X-ray position...Full Text

Using 932 s of XRT Photon Counting mode data and 2 UVOT images for GRB 120514A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 283.00078, -4.26359 which is equivalent to: RA (J2000): 18h 52m 0.19s Dec (J2000): -04d 15' 48.9" with an uncertainty of 1.8 arcsec (radius, 90% confidence). This position...Full Text

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We imaged the field of GRB 120514A detected by SWIFT (trigger 522197) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 534s after the GRB trigger. The elevation of the field increased from 37 degrees above horizon and weather conditions were good. We co-added a series of exposures. We do not detect any OT in the XRT error box with a limiting...Full Text

At 01:12:49 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120514A (trigger=522197). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 282.991, -4.252 which is RA(J2000) = 18h 51m 58s Dec(J2000) = -04d 15' 06" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed...Full Text

Starting on the evening of 11/05/2012 we observed the field of GRB 120422A (Troja et al., GCN 13243) 19.448 days after the burst, using a 50 cm Cassegrain telescope located at the Mountain Station of the Konkoly Observatory equipped with an Andor iXon + 888 EMCCD camera through R and I filters. On the coadded R images (exp.time 600 sec) we could not detect the OT associated SN (Giorgos Leloudas...Full Text

"The event which triggered the Fermi Gamma-ray Burst Monitor at 17:46:57 UT on 10 May 2012 (120510741/358364818) is not a GRB. This event was classified as being of uncertain origin by the GBM Flight Software owing to an inability to localize it on-board. Inspection of the data suggests that this event is of solar origin, correlating in time with a C-class solar flare seen in the GOES data. ...Full Text

"Following the possible detection (Gorbovskoy et al. GCN 13285) of an optical transient (10th mag) within the Fermi Trigger 358364818 error box, we have observed the field with the 0.6m BOOTES-4/MET robotic telescope at the Lijiang Astronomical Observatory, China. r'-band images (120 s each) were obtained starting at 19:26 UT on May 11. No source is detected at the reported MASTER-II position down...Full Text

A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory 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 V.Krushinski, I.Zalozhnich, A. Popov, A. Bourdanov, A. Punanova Ural Federal University Hugo Levato...Full Text

The Swift XRT and UVOT instruments observed the centre of the error circle for the MAXI-detected GRB 120510A (Serita et al., GCN 13282) from 21.4 to 33.0 ks after the trigger. The XRT data comprise 2.0 ks of Photon Counting (PC) mode data. A faint source is detected RA, Dec = 44.04666, +72.88692 which is equivalent to: RA (J2000): 02h 56m 11.20s Dec (J2000): +72d 53' 12.9" with...Full Text

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...Full Text

During a scan transit centered at UT 2012-05-10T08:47:44, MAXI/GSC detected a short X-ray transient lasting about 27 seconds within the 42 seconds triangular transit response of MAXI/GSC. Judging from its hardness ratio, this transient is probably a gamma-ray burst. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (+44.285 deg, +72.850deg)...Full Text

We have obtained spectroscopy of the optical counterpart of GRB 120422A (Troja et al. GCN 13243, Cucchiara et al. GCN 13245) and its host galaxy, at a redshift of 0.283 (Tanvir et al. GCN 13251, Schulze et al. GCN 13257) in two epochs, 3.6 and 14.6 days after the burst. Both spectra were obtained with a resolution of ~500 and cover the range between 4800 and 10000 AA. The first epoch is...Full Text