//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5150 SUBJECT: GRB 060522: Swift detection of a burst with possible optical afterglow DATE: 06/05/22 02:47:17 GMT FROM: Derek Fox at PSU D. B. Fox (PSU), J. R. Cummings (NASA/ORAU), N. Gehrels (NASA/GSFC), S. T. Holland (GSFC/USRA), S. D. Hunsberger (PSU), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC), D. C. Morris (PSU), D. M. Palmer (LANL) and M. Stamatikos (NASA/GSFC/ORAU) report on behalf of the Swift Team: At 02:11:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060522 (trigger=211117). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 322.951, +2.876 {21h 31m 48s, +02d 52' 33"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Since this was a 64-sec BAT image trigger, there is not enough information in the light curve at this time to describe the time profile of the burst. The peak count rate was ~500 counts/sec (15-350 keV), at ~5 sec after the trigger. The XRT began taking data at 02:13:40 UT, 142 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image, however analysis of initial downlinked data shows the presence of an uncatalogued point source at the following coordinates: RA (J2000) = 21:31:44.9, Dec(J2000) = +02:53:08.5, with an error radius of 4.0 arcseconds (90% containment). This source is 61 arcseconds from the BAT position. The UVOT began a 100 s white exposure at 02:13:47. A point source is detected in the XRT error circle with a white magnitude of 19.7. This source is not present in the DSS. The coordinates of this source are 21:31:44.8, +02:53:10 (J2000) with an uncertainty of +/- 0.6 arcsec (90% containment). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5151 SUBJECT: GRB 060522: TNG optical observations DATE: 06/05/22 05:22:51 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo (INAF/OAB), S. Piranomonte (INAF/OARm), A. Magazzu`, G. Mainella (INAF/TNG), report on behalf of a larger collaboration: We observed the field of GRB 060522 (Fox et al. GCN 5150) with the 3.6m TNG telescope located in Canary Islands. One R-band image was obtained with TNG+DOLoRes, starting on May 22.1556 UT (about 1.5 hours after the burst) for a total exposure time of 10 minutes. We see a bright object at the following position: R.A.= 21:31:44.8, Dec +02:53:10.35 +/- 0.20 arcsec (J2000) with a magnitude of R = 20.6 +/- 0.1 (vs USNO@ESO catalog) We note that the position of this object is consistent with the UVOT afterglow candidate reported by Fox et al. (GCN 5150). We thank the observing staff at TNG. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5152 SUBJECT: GRB 060522: REM NIR observations DATE: 06/05/22 10:20:41 GMT FROM: Stefano Covino at Brera Astronomical Observatory S. Vergani, P. D'Avanzo, S.Covino, E. Molinari, G. Chincarini, F.M. Zerbi, V. Testa, G. Tosti, F. Vitali, P. Conconi, L.A. Antonelli, G. Cutispoto, G. Malaspina, L. Nicastro, E. Palazzi, E. Meurs, and P. Goldoni report on behalf of the REM/ROSS team: We imaged the field of GRB 060522 (Fox et al., GCN 5150) with the robotic 60-cm REM telescope located at La Silla (Chile) under mediocre weather conditions. A first set of observations was performed automatically in the near infrared (J, H, K, z bands) starting on May 22.2306 UT (about 3.3 hours after the burst). Then, we took a set of 20x100s H band images starting on May 22.2785 UT (about 4.5 hours the burst). Preliminary analysis of both the datasets does not show any new source down to H = 16.5 and H=17.0 (3-sigma upper limits) respectively, at the position of the candidate optical afterglow reported by Fox et al. (GCN 5150) and D'Avanzo et al. (GCN 5151). This message is citeable. [GCN OPS NOTE(24may06): Per author's request, Antonelli was added to the author list.] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5153 SUBJECT: GRB 060522: Swift-BAT Refined Analysis DATE: 06/05/22 13:25:26 GMT FROM: Hans Krimm at NASA-GSFC H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), on behalf of the Swift-BAT team: Using the data set from T-239.0 to T+730.1 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060522 (trigger #211117) (Fox, et al., GCN 5150). The BAT ground-calculated position is (RA,Dec) = 322.953, 2.889 deg {21h 31m 48.8s, 2d 53' 18.9"} (J2000) +- 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%. The mask-weighted light curve shows two broad peaks, the first with a FRED-like profile from T+0 to T+20 sec and the second with a square profile from T+25 to T+80 sec. Nearly all emission is below 100 keV. T90 (15-350 keV) is 69 +- 5 sec (estimated error including systematics). The time-averaged spectrum from T+0.2 to T+76.9 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.59 +- 0.15. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+4.41 sec in the 15-150 keV band is 0.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5154 SUBJECT: GRB 060522: Swift/XRT Team refined analysis DATE: 06/05/22 17:43:27 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT J. A. Kennea, D. C. Morris and D. Fox (PSU) report on behalf of the Swift/XRT Team: We have analysed the first 4 orbits of Swift/XRT data of GRB 060522 (Fox et al., GCN 5150) which equates to 4496+126 seconds of data. We find a refined XRT position for this burst of: RA(J2000) = 21:31:44.91 Dec(J2000) = +2:53:08.14 with an error of 3.7 arcseconds radius (90% containment). This position is 58 arcseconds from the refined BAT position quoted by Krimm et al. (GCN 5153), 0.4 arcseconds from the original XRT position from Fox et al., and 2.8 arcseconds from the optical counterpart reported by UVOT and confirmed by TNG (D'Avanzo et al., GCN 5151). The afterglow shows several states: from T+150 to T+190 the lightcurve was bright (~6 XRT c/s) and relatively flat, at T+190 the lightcurve breaks and rapidly decays with a power-law slope of -4.0. The lightcurve breaks again at T+233s and flattens to a slope of -1.77. Centered at T+540 there is a small flare in the lightcurve. From T+1000s to T+5500s there is no data in the lightcurve, however the lightcurve appears to have flattened in this time. Data from T+5000 onwards shows the lightcurve is decaying with a slope of -1.3. The average spectrum of the burst is well fit by an absorbed power-law model. The parameters of this fit are N_H = (4.6 +/- 2.5) x 10^20 cm^-2, and a power-law photon index of 1.97 +/- 0.21 (errors 90% confidence). The expected galactic absorption from this position in the sky is 4.83 x 10^20 cm^-2, so there is no evidence of excess absorption in this burst afterglow. The prediction for the brightness of the burst 24 hours after the BAT trigger is approximately 2x10^-3 XRT Counts/s which is equivalent to a flux of ~7x10^-14 erg/s/cm^2 (0.2-10 keV). This circular is an official product of the Swift/XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5155 SUBJECT: GRB060522: z = 5.11 Keck-LRIS Redshift DATE: 06/05/22 22:17:46 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko (Caltech), E. Berger (Carnegie), S. G. Djorgovski, A. A. Mahabal (Caltech), and D. B. Fox (Penn State) report on behalf of a larger collaboration: We have observed the location of the afterglow of GRB060522 (Fox et al., GCN 5150; D'Avanzo et al., GCN 5151) with the Low-Resolution Imaging Spectrometer mounted on the 10-m Keck I telescope. We obtained an 1800 s spectrum shortly before morning twilight at a mean epoch of May 22.65 UT (~ 12.5 hr after the burst). We find a prominent absorption feature centered around ~ 7425 A, with a strong depression in flux blue-ward of this break. Identifying this as the Lyman-alpha break and fitting a DLA profile to the spectrum, we find z = 5.11 +/- 0.01 and log(nH) = 20.5 +/- 0.5. At this redshift and using a 15-150 keV fluence of 1.1e-6 (Krimm et al., GCN 5153), we find the prompt emission isotropic energy release from GRB060522 is 5.1e52 ergs. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5158 SUBJECT: GRB 060522: Swift/UVOT Observations of the Optical Afterglow DATE: 06/05/23 16:26:10 GMT FROM: Stephen Holland at USRA/NASA/GSFC/SSC GRB 060522: Swift/UVOT Observations of the Optical Afterglow S. T. Holland (NASA/GSFC & USRA) reports on behalf of the Swift/UVOT team: The Swift UVOT began observing GRB 060522 (trigger #211117, Fox et al., GCN Circular 5150) 129 seconds after the BAT trigger. We detect the UVOT optical transient reported in the above Circular in the White filter. The J2000 coordinates of the afterglow are RA = 21:31:44.85 Dec = +02:31:44.9 with an uncertainty of +/- 0.6 arcseconds (90% containment). Magnitudes and 3-sigma upper limits are reported below. Midpoint Coadded Filter Time Exposure Mag Err (sec) (sec) White 198 100 19.65 0.21 White 749 9 >18.4 3-sigma upper limit White 927 98 >20.3 3-sigma upper limit White 6266 197 >20.9 3-sigma upper limit White 74,157 4766 >22.1 3-sigma upper limit V 452 400 >20.1 3-sigma upper limit V 792 20 >17.6 3-sigma upper limit V 1100 231 >19.5 3-sigma upper limit V 18,351 1967 >20.8 3-sigma upper limit B 3447 206 >20.7 3-sigma upper limit U 18,315 1451 >21.0 3-sigma upper limit UVW1 17,925 2904 >22.0 3-sigma upper limit UVM2 17,533 1944 >21.9 3-sigma upper limit UVW2 23,194 2001 >21.7 3-sigma upper limit These data are consistent with the burst having a redshift of z = 5.11 (Cenko et al., 2006, GCN Circular 5155). No correction has been made for the Galactic reddening of E(B-V) = 0.05 mag (Schlegel et al. 1998) along the line of sight to GRB 060522. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5159 SUBJECT: GRB 060522: Swift/UVOT Observations: Correction DATE: 06/05/23 18:16:22 GMT FROM: Stephen Holland at USRA/NASA/GSFC/SSC GRB 060522: Swift/UVOT Observations: Correction S. T. Holland (NASA/GSFC & USRA) reports on behalf of the Swift/UVOT team: There is an error in the coordinates of the optical afterglow of GRB 060522 reported in Holland (2006, GCN Circular 5058). The correct J2000 coordinates are RA = 21:31:44.85 Dec = +02:53:10.8 with an uncertainty of +/- 0.6 arcseconds (90% confidence). We apologize for the error and any inconvenience that it may have caused. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5232 SUBJECT: GRB 060522: PROMPT Optical Limits DATE: 06/06/06 18:37:05 GMT FROM: Chelsea Louise MacLeod at UNC-Chapel Hill/PROMPT A. Smith, S. Parris, C. MacLeod, J. Harvey, M. Nysewander, D. Reichart, report on behalf of the UNC team of the FUN GRB Collaboration: Skynet observed the localization of the high-redshift GRB 060522 (Fox et al., GCN 5150, Cenko et al., GCN 5155) with three of the 16" PROMPT telescopes at CTIO and with 14.5" TTT in Colorado beginning 3.1 hours after the burst: Filter Start (UT) Stop (UT) Exposures Total (hr) Telescope r' 05:17:02 09:39:04 74 x 80s 1.6 PROMPT-4 U 05:17:04 09:39:20 74 x 80s 1.6 PROMPT-3 z' 05:18:08 10:28:57 145 x 80s 3.2 PROMPT-5 + 1 x 40s i' 05:42:49 10:28:20 72 x 80s 1.6 PROMPT-4 g' 05:42:49 10:28:38 72 x 80s 1.6 PROMPT-3 V 07:29:06 09:37:22 22 x 160s 1.0 TTT Red* 07:24:57 10:25:26 36 x 160s 1.6 TTT * Approximates R band We were unable to see the afterglow down to a 3-sigma limiting magnitude of r' > 21.2 and z' > 20.9 at 4.2 hours and i' > 21.5 and z' > 21.3 at 4.9 hours after the burst. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5352 SUBJECT: GRB 060522: VLA observation DATE: 06/07/19 22:50:36 GMT FROM: Poonam Chandra at U Virginia/NRAO P. Chandra (UVA/NRAO), P. B. Cameron (Caltech), A. M. Soderberg (Caltech) and D. A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We observed the field centered on the BAT position of the Swift burst GRB 060522 (GCN#5150) using the VLA at a frequency of 8.46 GHz and starting at 8.56 UT on July 18, about 57 days after the burst. There is no detection of the GRB with 3-sigma upper limit of 57 microJy. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."