The long GRB 100728A (Fermi/GBM trigger #301976252; von Kienlin et al., GCN 11006; Swift/BAT trigger #430151; Cannizzo et al., GCN 11004) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2010-07-28 02:17:32.68 UT (=T0). The observed light curve shows a multi-peaked structure starting at T0-5s, ending at T0+198s, with a duration (T90) of about...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

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

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

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

Skynet observed the Swift/BAT localization of GRB 100728A (Swift trigger #430172) with four of the 16" PROMPT telescopes at CTIO beginning 45 seconds after the trigger in BVRI. We detect the afterglow in all filters. At 50 seconds after the trigger, its magnitude is I = 14.62 +0.08 -0.07 (calibrated to 10 SDSS stars), R = 15.24 +0.07, -0.06 (calibrated to 7 SDSS stars), V = 15.78, +0.08, -0.07 (calibrated...Full Text

The Katzman Automatic Imaging Telescope (KAIT) responded to GRB 100728A and began taking data starting less than one minute after the trigger. A moderately bright optical transient not present in DSS survey imaging is visible in the initial set of exposures at the following position: RA = 02:56:13.48 dec = +00:16:51.8 (J2000) We measure I = 18.7 +/- 0.3 mag at 10:33:51 UT (t = 95 secs after...Full Text

"At 02:17:30.61 UT on 28 July 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100728A (trigger 301976252 / 100728095), which was also detected by the Swift-BAT (Cannizzo et al. 2008, GCN 11004) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 58.6 degrees. The GBM light curve shows a multi-peaked structure with a...Full Text

Using 5085 s of XRT Photon Counting mode data and 8 UVOT images for GRB 100728A, 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 = 88.75839, -15.25531 which is equivalent to: RA (J2000): 05h 55m 2.01s Dec (J2000): -15d 15' 19.1" with an uncertainty of 1.4 arcsec (radius, 90% confidence). This position...Full Text

At 02:18:24 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100728A (trigger=430151). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 88.743, -15.262 which is RA(J2000) = 05h 54m 58s Dec(J2000) = -15d 15' 42" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed...Full Text