In addition to the BVRcIc calibration, we also acquired some early time, short exposure Rc and Ic imagery for the INTEGRAL burst GRB 041219 (Gotz et al., GCN 2866) with the USNOFS 1.0-m telescope. At the position of the NIR afterglow (Blake and Bloom, GCN 2872), we find no optical afterglow in the Ic bandpass at t+13 minutes, to a limit of Ic=19.7. ...Full Text

GRB 041219 (Mereghetti et al., GCN 2866; and Barthelmy et al., GCN 2874) was observed during two dwells, each of duration 90 s, with Scanning Shadow Camera 3 of the RXTE ASM. The observations cover the interval 2004 December 19 1:42:24 to 1:45:30 UTC except for a single 6 s gap in the middle of the interval. Automated real-time analysis of RXTE ASM data yielded a detection of GRB 041219...Full Text

We observed the NIR afterglow (Blake and Bloom, GCN 2870) of GRB 041219, a burst localized by Integral (Gotz et al., GCN 2866) and Swift-BAT (Barthelmy et al., GCN 2874), on the night of December 20th, using C-NIC (formerly NIC-FPS) on the ARC 3.5-meter telescope at Apache Point Observatory. The observation began at 01.05 UT, 47.25 hours after the burst, and consisted of a series of 120...Full Text

The INTEGRAL-Swift Burst of 041219 (GCN 2866, Gotz et al, GCN 2874, Barthelmy et al.) had a time history that is rather rare: a precursor was followed by 200 sec of mostly quiet emission before a huge spiky outburst that lasted an additional 300 sec. This is one of the few events for which there have been simultaneous ground observations. It is the first event with simultaneous IR observations...Full Text

The field of GRB 041219 (Mereghetti, et al., GCN 2866) was observed with the robotic 25 cm TAROT telescope at Calern, France. The observation started 25 seconds after the GCN notice without filter. The field was only 28 degrees above horizon....Full Text

"We reobserved the INTEGRAL GRB 041219 (GCN 2866) at 4.9 GHz with the Westerbork Synthesis Radio Telescope on December 21 from 14.45 to 23.55 UT, i.e. 2.54 - 2.93 days after the burst. Compared to our previous measurement (GCN 2894), the average flux density has increased to 349 +/- 22 microJy. Assuming a power law behaviour, the average temporal index at 4.9 GHz between this and our previous...Full Text

"We observed the INTEGRAL GRB 041219 (GCN 2866) at 4.9 GHz with the Westerbork Synthesis Radio Telescope on December 20 from 15.55 to 23.59 UT, i.e. 1.59 - 1.93 days after the burst. We detect a radio source at the position of the infrared afterglow reported by Bloom et al. (GCN 2893) with an average flux density of 205 +/- 20 microJy, and a probable increase in the flux density during...Full Text

Comparing the IR flash discovery images (GCN 2870) of GRB 041219 (GCN 2866, GCN 2874) to 25 stars in the 2MASS catalogue, we find a refined absolute astrometric position of the IR flash to be (J2000): ...Full Text

" We have observed the position of infrared afterglow candidate reported by Blake et al. (GCN 2870) at Lulin (Taiwan, 1-m telescope) and XingLong (China, 0.8 m telescope) Observatory. The R band observations are summarized as below: ...Full Text

The RAPTOR-S telescope responded robotically to INTEGRAL trigger #2073. Our first image began at 01:44:13.65 UT, 8 seconds after receipt of the Integral notice and while the GRB was still ongoing. Summing our images over the duration of the GRB emission (1:44 UT to 1:52 UT), we marginally detect a possible source very close to our threshold at the location of the candidate given by Blake and...Full Text

We observed INTEGRAL/Swift GRB 041219 localization by Gotz et al. (GCN 2866) with 1.04m telescope at ARIES NainiTal. In a single 900 sec R_c band frame, we did not detect the optical afterglow at the IR afterglow position of the source by Blake & Bloom (GCN 2870). We put an upper limit ~ 21 mag, around 13 hours after the burst....Full Text

"We have imaged the position of the NIR afterglow of GRB 041219 (Blake and Bloom, GCN 2870) with the robotic Palomar 60-inch telescope. We detect the presence of a faint source at this position, with a z-band magnitude of 21.0 +/- 0.3. The mean epoch of our observations is approximately 04:57 UT, December 20....Full Text

"We have continued to image the NIR afterglow of GRB 041219 (Blake and Bloom, GCN 2870) with the Wide Field Infrared Camera (WIRC) on the Palomar 200-inch Hale Telescope. Our latest observations in the K_s band, taken at a mean time of 01:58:00 UT (1.01 days after the burst), put the object at a magnitude of 16.5 (with reference to the 2MASS catalog). This is a significantly shallower decay...Full Text

"We have observed the field covering the error box of GRB 041219 (INTEGRAL trigger 2073; trigger time 01:42:54.79 UT) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 11:17:21 UT on Dec.19 . Observed field of view is 43 arcmin centerd on ...Full Text

"We observed the field of GRB 041219 (GCN 2866) with the Very Large Array on 2004 Dec 20.14 UT (t ~ 1.1 days after the burst). At 8.5 GHz we detect a radio source coincident with the optical afterglow reported by Blake & Bloom (GCN 2870) with a flux density of 0.45 +- 0.05 mJy. Further observations are planned."...Full Text

"We have imaged the field of GRB 041219 with the Wide Field Infrared Camera (WIRC) on the Palomar 200-inch Hale Telescope. We can confirm the presence of a fading source at the position reported by Blake and Bloom (GCN 2870). Our K_s magnitudes (with reference to the 2MASS catalog) are as follows: ...Full Text

At 01:42:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located on-board GRB 041219 (GCN 2866, D.Gotz et al.). The spacecraft did not autonomously slew to the burst since automated slewing is not yet enabled....Full Text

"PAIRITEL continued to image the field of GRB 041219 (GCN 2866) starting from 19 Dec 2004 01h49m18 UT , about 2.8 minutes after the GRB (see GCN 2865). That first epoch of imaging had a total integration time of 533 sec. A second epoch of image began at 02h46m59 UT (502 sec total integration). A comparison with the 2MASS Quicklook and Atlas K-band images reveals a new point source at RA 00h24m27...Full Text

We have acquired BVRcIc all-sky photometry for a 11x11 arcmin field centered on the coordinates for the INTEGRAL burst GRB 041219 (Gotz et al., GCN 2866) with the USNOFS 1.0-m telescope on one marginally photometric night. Stars brighter than V=13.0 are saturated and should be used with care. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb041219.dat...Full Text

"PAIRITEL continued to image the field of GRB 041219 (GCN 2866) starting from 19 Dec 2004 01h49m18 UT , about 2.8 minutes after the GRB (see GCN 2865). That first epoch of imaging had a total integration time of 533 sec. A second epoch of image began at 02h46m59 UT (502 sec total integration). A comparison with the 2MASS Quicklook and Atlas K-band images reveals a new point source at RA 00h24m27...Full Text