We observed the field of the Swift GRB 100728B (Morris et al. GCN 11009) with 0.45-m telescope Ïf ISON-NM observatory on July 28 (Elenin at al., GCN 11012). The afterglow ( Perley et al. GCN 11007; Morris et al. GCN 11009; Ivarsen et al. GCN 11011) is detectable on each of four images taken between July 28 (UT) 10:45:49 - 11:01:14. A photometry of unfiltered images against SDSS field stars...Full Text

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RA (J2000)= 0.28116, DEC (J2000)=44.05611, which is equivalent to: RA (J2000) = 02:56:13.467 Dec (J2000) = +00:16:52.18 The coordinates in the degree format in circular 11026 were accidentally taken from a different GRB. ...Full Text

We observed the field of GRB 100728B (Morris et al., GCN 11009) with the NOT equipped with StanCam, under poor seeing conditions. Observations were carried out in the R filter for 40 minutes, with mean time 18.36 hours after the GRB trigger. The seeing was 1.3". At the position of the optical afterglow (Perley et al., GCN 11007; Morris et al., GCN 11009) we do not detect any clear source, down...Full Text

The Swift/UVOT began observerving the field of GRB 100728B 101s after the BAT trigger (Morris et al., GCN 11009). We detect the optical afterglow in the white, v, b and u filters only. The refined UVOT position is RA (J2000)= 163.48809, DEC (J2000)=-45.47265, which is equivalent to: RA (J2000) = 02:56:13.467 Dec (J2000) = +00:16:52.18 with an estimated uncertainty of 0.52 arcsec...Full Text

We began observations of the afterglow of GRB 100728B (Morris et al., GCN 11009; Perley et al., GCN 11007) with the Nickel 40-inch telescope at Lick Observatory starting at 10:38:32 UT, 397 sec after the Swift trigger. A series of frames in R-band (as well as one V-band and one U-band exposure) was acquired. The resulting light curve shows a gradual, unbroken power-law decay with a decay...Full Text

The Katzman Automatic Imaging Telescope (KAIT) began observations of GRB 100728B (Morris et al., GCN 11009) at 30 sec after the trigger time (10 sec after the GCN notice), and continued to track the afterglow in a combination of V, I, and unfiltered exposures until shut down by morning twilight. The afterglow remains detected throughout this period. An series of 2-second frames taken between...Full Text

Using the data set from T-240 to T+350 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100728B (trigger #430172) (Morris, et al., GCN 11009). The BAT ground-calculated position is RA, Dec = 44.051, 0.296 deg which is RA(J2000) = 02h 56m 12.2s Dec(J2000) = +00d 17' 45.9" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding...Full Text

We have analysed 6.8 ks of XRT data for GRB 100728B (Morris et al. GCN 11009), from 81 s to 17.4 ks after the BAT trigger. The data comprise 86 s in Windowed Timing (WT) mode (the first 9 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 11017). The light curve can be modelled with...Full Text

Using 820 s of XRT Photon Counting mode data and 2 UVOT images, 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 = 44.05620, 0.28120 which is equivalent to: RA (J2000): 02 56 13.48 Dec (J2000): +00 16 52.5 with an uncertainty of 2.0 arcsec (radius, 90% confidence). This position may be improved...Full Text

"At 10:31:54.97 UT on 28 July 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100728B (trigger 302005916 / 100728439), which was also detected by the Swift-BAT (Morris et al. 2008, GCN 11009) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 57.1 degrees. The GBM light curve shows a single pulse with a duration (T90)...Full Text

We observed the field of GRB 100728B (Swift trigger 430172; Morris et al., GCN 11009) simultaneously in JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile). Observations started at 10:34 UT, 2 minutes after the GRB trigger. They were performed during astronomical twilight at an average airmass of 1.2. We detect a single point...Full Text

We observed the field of the Swift GRB 100728B (Page et al. GCN 11009) with 0.45-m astrograph f/2.8 Ïf ISON-NM observatory (32d 54' 11.64'', 105d 31' 42. 34'' ) starting July 28 (UT) 10:56:08, i.e. 24 minutes after burst onset. A few unfiltered 300s exposures were taken before down. In a first exposures we clearly detect the afterglow at the position (J2000) RA= 02 56 13.48 Dec= +00 16 51...Full Text

The observations reported in GCN 11008 (Swift trigger #430172) should refer to GRB 100728B rather than GRB 100728A. We observed the optical transient at the following position: RA = 02:56:13.51 Dec = +00:16:52.16 We apologize for any inconvenience this may have caused. ...Full Text

The burst observed in our previous circular was in fact 100728B (Swift trigger #430172), and not 100728A (#430151, Cannizzo et al., GCN 11004). We apologize for any confusion this may have caused. ...Full Text

At 10:31:55 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100728B (trigger=430172). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 44.053, +0.280 which is RA(J2000) = 02h 56m 13s Dec(J2000) = +00d 16' 46" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed...Full Text