...Full Text

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

The long GRB 100728A (Swift/BAT trigger 430151: Canizzo et.al, GCN 11004) triggered Konus-Wind at T0=8300.008s UT (02:18:20.008) The burst light curve shows a complex structure with a total duration of ~200 s. There is a hint of a weaker emission lasting at least to T0+290 s. The emission is seen up to several MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB100728_T08300/...Full Text

We observed the field of GRB 100728A (Swift trigger 430151; Cannizzo et al., GCN 11004; A. von Kienlin, GCN 11006) simultaneously in g'r'i'z'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 09:26 UT, 7 hours after the GRB trigger and were terminated at 10:32 UT by the GRB 100728B trigger. They were...Full Text

The Swift/UVOT observed the field of GRB 100727A starting 47 s after the BAT trigger (Morris, et al., 2010, GCN 10998). Settled observations started at 65 s. We do not find any new source, relative to the DSS, USNO-B1.0, or 2MASS at the position of the XRT afterglow (Osborne, et al. 2010, GCN 11000). Preliminary 3-sigma upper limits for detecting a source in the finding charts, and in the co-added...Full Text

Using the data set from T-130 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 100728A (trigger #430151) (Cannizzo, et al., GCN 11004). The BAT ground-calculated position is RA, Dec = 88.753, -15.259 deg which is RA(J2000) = 05h 55m 00.7s Dec(J2000) = -15d 15' 33.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding...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

The Swift/UVOT began settled observations of the field of GRB 100728A 86s after the BAT trigger (Cannizzo et al., GCN 11004). We do not detect a new source at the enhanced Swift XRT position (Evans et al. GCN 11005). The preliminary 3-sigma upper limits for the finding chart exposures (FC) and summed images are: Filter T_start T_stop Exp(s) Mag (3-sigma upper limit) ------------------------------------------------------------- white...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 have analysed 10 ks of XRT data for GRB 100728A (Cannizzo et al. GCN 11004), from 66 s to 23.4 ks after the BAT trigger. The data comprise 1.3 ks 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 Beardmore et al. (GCN. Circ 11005). The light curve can be modeled...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