We observed GRB 100302A afterglow position (Goad et al. GCN 10460, Huang et al. GCN 10461 and Cucchiarar & Fox GCN 10465) in i-band (12x300s) using 1.0 telescope at Mt. Lemmon (Arizona, US) operated by the Korea Astronomy Space Science Institute. No significant detection of afterglow in our i-band combined image at 11.0709 hours after the burst. The 3-sigma limiting magnitude is 20.8, which calibrated...Full Text

We acquired unfiltered CCD images of GRB 100302A XRT error box (J.R.Cummings, GCN 10458) with Ondrejov 65cm telescope + CCD. AS the CCD is equipped with IR-block filter its sensitivity in I band is very close to 0. Observation started March 3 00:40 UT (4h47m after the BAT trigger). During observation which run till 03:00 UT 45 of 3 minutes exposures were obtained. On the combined image we do not...Full Text

The Swift/UVOT began settled observations of the field of GRB 100302A 132 s after the BAT trigger (Cummings et al., GCN 10458). No optical afterglow consistent with the XRT position (Cummings et al., GCN 10458) is detected in the initial UVOT exposures. We do not see any source within the XRT error circle that might correspond to the R and I-band source reported by Huang et al. (GCN 10461) from...Full Text

We have analysed the first 3 orbits of Swift-XRT data obtained from GRB 100302A (trigger 414592; Cummings, et al., GCN 10458) from 125 s to 28.8 ks after the BAT trigger. The best position of the X-ray afterglow is the UVOT enhanced XRT position given in Goad et al. (GCN 10460). The 0.3-10 keV light curve shows a multiple peak structure, with three main spikes at about T+200, T+250 and T+400s...Full Text

Further analysis of the Gemini-North GMOS spectrum of the afterglow (Huang et al., GCN 10461) of GRB 100302A (Cummings et al., GCN 10458) described in GCN 10465 (Cucchiara et al.) reveals that the afterglow shows a sharp increase in continuum flux redward of 7100 Angs, with only a weak continuum detected between 5500 and 7000 Angs, consistent with absorption by H I at z~4.8. There are several...Full Text

"On March 3.40 UT we observed the field of GRB 100302A (Cummings et al., GCN 10458) with the Gemini-N telescope and the GMOS spectrograph. In our 300s i'-band acquisition image we clearly identify a source inside the XRT refined error circle (Goad et al. 10460). Using 3 USNO-B1 stars we calibrated our photometry and obtained i' = 22.01 +- 0.05 mag This value is significantly below the detection...Full Text

We observed the field of GRB 100302A (Cummings et al., GCN 10458) from Crni Vrh Observatory with a 60 cm robotic telescope, R filter and CCD. Twenty consecutive exposures of 60 second duration were taken in moonlight conditions. First exposure started at 2010-03-02 19:56:20 UT, 194 seconds after the burst (105 seconds after the SWIFT trigger). No optical candidate was detected within the uncertainty...Full Text

E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zemnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnih, T.Kopytova, A. Popov Ural State University, Kourovka K...Full Text

Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100302A (trigger #414592) (Cummings, et al., GCN 10458). The BAT ground-calculated position is RA, Dec = 195.504, 74.568 deg which is RA(J2000) = 13h 02m 01.0s Dec(J2000) = +74d 34' 04.0" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial...Full Text

Using 478 s of XRT Photon Counting mode data and 1 UVOT images for GRB 100302A, 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 = 195.51524, +74.58959 which is equivalent to: RA (J2000): 13h 02m 3.66s Dec (J2000): +74d 35' 22.5" with an uncertainty of 1.9 arcsec (radius, 90% confidence). This position...Full Text

Skynet observed the Swift/BAT localization of GRB 100302A (Cummings et al., GCN 10458) with the 16" telescope at the Dolomiti Astronomical Observatory in Italy beginning 2.7 minutes after the trigger (1.3 minutes after notification) in Red, which we have calibrated to R. We do not detect the afterglow (Cummings et al., GCN 10458). Stacking only images that increase the limiting magnitude...Full Text

At 19:53:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100302A trigger=414592). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 195.344, +74.581 which is RA(J2000) = 13h 01m 23s Dec(J2000) = +74d 34' 51" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed...Full Text