1 Changes

Change the BAT light curve to show more structure (Fig. 1). There had been a correction to the XRT light curve (Fig. 2) due the presence of dead pixel column (Guidorzi, et al., GCN Circ. 7115). Information about possible red-shift measurement is added to the introduction section. XRT and UVOT sections are also updated.

2 Introduction

BAT triggered on GRB 071117 at 15:06:46 UT (Trigger 296805) (Ukwatta, et al., GCN 7098). This was a 1.024 sec rate-trigger on a long burst with T90 = 6.6 ± 1.8sec.

Because of an Earth limb constraint, the spacecraft did not slew promptly to the BAT position, and hence there was no immediate XRT position. Narrow field instruments started observations at T+43 minutes, and our best position is the XRT location RA(J2000) = 335.04336deg (22h20m10.41s), Dec(J2000) = -63.44278deg (-63d26 34.0 ) with an error of 3.8 arcsec (90% confidence, including boresight uncertainties), reported by Guidorzi et al., GCN 7115.

There was a possible red-shift measurement of 1.331 reported by Jakobsson et al., GCN 7117.

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We observed the field of GRB 071117 (Ukwatta et al., GCN 7098) with the ESO VLT, starting on 2007 Nov 18.005 UT (9.28 hr after the GRB). We clearly detect the two sources indicated by Bloom (GCN 7105, GCN 7110), including the afterglow s2. Source s1 appears extended in our images, while source s2 is indeed pointlike (seeing 0.85"). A faint nebulosity is apparent surrounding both objects...Full Text

We recalculated the XRT refined position of GRB 071117 (trigger=296805, Ukwatta et al., GCN 7098) by excluding the first orbit data, which were affected by the presence of a dead pixel column. In 8.3 ks of Photon Counting mode data spanning 8.7-28 ks after the trigger the position of the X-ray afterglow is RA,Dec =335.04336,-63.44278 degrees, which corresponds to ...Full Text

The GRB 071117 (Swift-BAT trigger #296805: Ukwatta et al., GCN 7098; Krimm et al., GCN 7102) triggered Konus-Wind at T0=53404.535 s UT (14:50:04.535). This burst also triggered Konus-A at T0=53408.587 s UT (14:50:08.587)....Full Text

The Swift/UVOT observed the field of GRB 071117 (Ukwatta et al., GCN 7098) 48 minutes after the BAT trigger, once the Earth had come out of observing constraint. No new source is found in any of the UVOT observations in either single or co-added exposures at the position of s2 reported by Bloom et al. (GCN 7110) or within the XRT error circle (Guidorzi et al., GCN 7103)....Full Text

"Starting at 2007 Nov 19 00h19m, deep r-band observations of the field of GRB 071117 (Ukwatta et al., GCN 7098) were obtained with Gemini (see Bloom, GCN 7105 for information about the first epoch). Image differencing reveals that source s2 (just outside the formal XRT error circle) is fading, and is the likely optical afterglow of the GRB. To reiterate the position: ...Full Text

We imaged the field of GRB 071117 detected by SWIFT (trigger 296805) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile....Full Text

"Imaging observations of the field of GRB 071117 (Ukwatta et al., GCN 7098) were autonomously queued for Gemini South as part of the program GS-2007B-Q-2 (PI = H.-W. Chen). Starting at 2007 Nov 18 00:24 UT 2007 Nov 18 00h24m UT, we obtained 5 x 180 sec images in r-band. Within the revised XRT error circle (Guidorzi et al. GCN 7103) we find one source (s1) at position: ...Full Text

"We observed the XRT error circle of GRB 071117 (GCN 7102, GCN 7103) with the Swope 40-inch telescope at LCO starting on 2007 Nov. 18.07 UT (10.8 hours after the burst). In a single 300 sec exposure we do not detect any source within the XRT error circle to a limit of i>21 mag." ...Full Text

1 Introduction

BAT triggered on GRB 071117 at 15:06:46 UT (Trigger 296805) (Ukwatta, et al., GCN 7098). This was a 1.024 sec rate-trigger on a long burst with T90 = 6.6 ± 1.8sec.

Because of an Earth limb constraint, the spacecraft did not slew promptly to the BAT position, and hence there was no immediate XRT position. Narrow field instruments started observations at T+43 minutes, and our best position is the XRT location RA(J2000) = 335.04579deg (22h20m10.99s), Dec(J2000) = -63.44278deg (-63d26 34.0 ) with an error of 3.8 arcsec (90% confidence, including boresight uncertainties), reported by Guidorzi et al., GCN 7103.

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Swift XRT observed the GRB 071117 (trigger=296805, Ukwatta et al., GCN 7098) beginning 2.8 ks after the BAT trigger. In 4.4 ks of Photon Counting mode data spanning 2.8-14.7 ks after the trigger the position of the X-ray afterglow is RA,Dec =335.04579,-63.44278 degrees, which corresponds to ...Full Text

Using the data set from T-119 to T+183 sec from recent telemetry downlinks, we report further analysis of BAT GRB 071117 (trigger #296805) (Ukwatta, et al., GCN 7098). The BAT ground-calculated position is RA, Dec = 335.026, -63.442 deg which is ...Full Text

Using prompt downlinked data (482.4 s), we find an X-ray source located at RA, Dec 335.0437, -63.4424 which is ...Full Text

UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 2852 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 18.5 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the...Full Text

At 14:50:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 071117 (trigger=296805). Swift did not slew immediately to the burst due to an Earth constraint. The BAT on-board calculated location is RA, Dec 335.020, -63.441 which is ...Full Text