//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3446 SUBJECT: XRF 050522 detected with INTEGRAL DATE: 05/05/22 06:54:59 GMT FROM: Diego Gotz at IASF-CNR D. Gotz, S. Mereghetti (IASF, Milano), N. Mowlavi, S. Shaw, M. Beck (ISDC, Versoix) and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A 15 s long GRB has been detected by IBAS in IBIS/ISGRI data in the 15-40 keV band at 06:00:21 on May 22 2005. It is not detected above 40 keV, which classifies it as an XRF. Its refined coordinates (J2000) are: RA: 200.1468 [degrees] DEC: +24.7916 [degrees] with an uncertainty of 2.5 arcmin (90% c.l. radius). Its preliminary peak flux (20-200 keV, 1s integration time) is about 0.34 ph (2.2E-08 erg)/cmsq/s. Its fluence (20-200 keV, 80 s integration time) is 1.7 ph (9E-08 erg)/cmsq. A plot of the double peaked light curve will be posted at http://ibas.mi.iasf.cnr.it/IBAS_Results.html Note that this burst is located at high galactic latitude (b=+83 deg) and not affected by Galactic absorption. It is therefore a good target for optical follow-up searches. This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3447 SUBJECT: XRF 050522: KAIT observations DATE: 05/05/22 09:11:14 GMT FROM: Weidong Li at UC Berkeley KAIT/LOSS W. Li, University of California, Berkeley, on behalf of the KAIT GRB team, reports: "The robotic 0.76-m KAIT at Lick Observatory observed XRF 050522 detected with INTEGRAL (Gotz et al., GCN 3446). A series of 23 images were automatically obtained from 06:01:40 UT (79s after the burst) to 07:35:25 UT (5704s after the burst), and were observed with a combination of using V and I filters, and without filters. The images were affected by the proximity of the GRB position to the bright moon. We did not detect a new object in our images when compared to the DSS II images. Our first 15s V-band exposure started at 79s after the burst has a limiting magnitude of about 16.2 when compared to the USNO-B1.0 catalog, while a 20s unfiltered image started at 130s after the burst has a limiting mag of about 18.7. " This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3448 SUBJECT: XRF050522: Near-infrared Observations DATE: 05/05/22 12:20:19 GMT FROM: Derek Fox at CIT Derek B. Fox, Dawn Erb, and Naveen Reddy (Caltech) report: "We have observed the localization region of XRF050522 (Gotz et al., GCN 3446) with the Palomar Hale 5.0-m telescope and Wide-Field Infrared Camera (WIRC), in a 30-minute series of exposures beginning at 08:21 UT (mean epoch 02:36 after the burst). We do not detect any bright new sources by comparison to 2MASS and XDSS images of the region, and therefore estimate a limiting magnitude for the afterglow of Ks > 17.2 mag at this time." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3449 SUBJECT: XRF050522: Optical Observations DATE: 05/05/22 15:17:07 GMT FROM: Aaron Price at AAVSO B. L. Gary (Hereford Arizona Observatory [G95]) and A. Price (AAVSO) report on behalf of the AAVSO International High Energy Network on early optical observations of XRF 050522 (GCN 3446; Gotz et al.): No afterglow candidate is found in the field compared to DSS to a limiting unfiltered magnitude of 18.7. Observation midpoint time was 06:38 UT (38 minutes after burst) on May 22, 2005. Details of the observation are below along with a link to the FITS image. The AAVSO thanks the Curry Foundation for their continued support of the AAVSO International High Energy Network. Observer: Bruce Gary (GBL) Site: Hereford Arizona Observatory (G95) Location: Sierra Vista, AZ; USA LatitudeLongitude: +31.45, -110.24 Elevation: 1420 m Scope: Celestron CGE-1400, 0.35 m SCT ScopeFocalRatio: f/1.86, 661 mm (prime focus) CCDVendor: SBIG ST-8XE CCDDetector: KAF1602E CCDSize: 1530 x 1020 CCDPixelScale: 2.80 "arc/pixel CCDFOV: 72 x 48 'arc Object: GRB050522 ObsDate: 2005.05.22 ObsMidPointTime: 06:38 UT TimePerFrame: 120 sec NumberOfFrames: 16 Filters: Clear Processing: dark/flat/mediancombine Seeing: 3 "arc FHWM LimitingMag: 19.0 (SNR=3) Sky: Clear, calm afterglowmag: <18.7 afterglowerr: compstars: All-sky Report: No new objects present when blinking with DSS image having similar limiting magnitude, for 20 'arc square FOV centered on GCN 3446 center coordinates; all stars brighter than 18.7 were accounted for in DSS. Image made 38 minutes after burst. comments: A FITS image has been uploaded to ftp://ftp.aavso.org/grb/BruceGary_GRB050522_2453512.81830_.fits //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3450 SUBJECT: XRF 050522 : Lulin observations DATE: 05/05/22 16:41:54 GMT FROM: Kuiyun Huang at IANCU XRF 050522 : Lulin observations P.S. Chiang (NCKU), K.Y. Huang, W.H. Ip (NCU), Y. Urata(RIKEN), Y. Qiu (BAO), Y.Q. Lou (THCA) on behalf of EAFON report: " We have imaged the entire error region of XRF 050522 (Gotz et al. GCN 3446) using 1.0-m telescope at Lulin Observatory, Taiwan. The R and VR band observations started at 12.03 UT (~ 6.02 hours after the burst). The limiting magnitude of our R band co-added image is ~ 20.6 compared with USNO-B1.0 stars. No source was detected under the limiting magnitude. This message may be cited." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3451 SUBJECT: XRF050522, BVRcIc field photometry DATE: 05/05/22 19:08:03 GMT FROM: Arne A. Henden at AAVSO A. Henden (USRA/USNO) reports on behalf of the USNO GRB Team: We have acquired BVRcIc all-sky photometry for an 11x11arcmin field centered on the coordinates for the INTEGRAL burst XRF050522 (Gotz, et al. GCN 3446) with the USNOFS 1.0-m telescope on one photometric night but with bright moonlight. Stars brighter than V=12.0 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/xrf050522.dat The astrometry in this file is based on linear plate solutions with respect to UCAC2. The external errors are less than 100mas. The estimated external photometric error is about 0.02mag. The first image was taken 16 minutes after the burst, and show no new sources in the INTEGRAL error box down to a plate limit of Rc=18.5. Since no afterglow has been reported, we do not anticipate any further observations at this time. However, as always, you should check the dates on the .dat file prior to final publication to get the latest photometry. There is a README file on the ftp directory to give you information about the procedures used to calibrate these fields. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3452 SUBJECT: XRF 050522: Swift XRT observation DATE: 05/05/22 19:54:45 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT J. A. Kennea, D. N. Burrows (PSU), M. Perri (ASDC), J. Cummings (GSFC) and N. Gehrels (NASA/GSFC) report on behalf of the Swift XRT team: INTEGRAL detected XRF 050522 at 06:00:21 UT on 22th May 2005 (GCN Circ 3446). The Swift observatory executed an Target of Opportunity observation of the INTEGRAL position and the XRT began taking data at 15:08:29 UT. In a preliminary data analysis we detect a single uncataloged X-ray source in the field, located at: RA(J2000) = 13:20:19.4, Dec(J2000) = +24:46:11 We estimate an uncertainty of 6 arcseconds radius (90% containment). This position is 3.9 arcminutes from the INTEGRAL position reported in GCN 3446, and lies outside of the 2.5 arcmin INTEGRAL error circle. Preliminary analysis suggests that this source does not fade significantly in observations across 2 orbits. We therefore tentatively suggest that this source is not related to XRF 050522. Observations of this field with Swift are continuing. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3456 SUBJECT: RBO Observations of GRB050522 DATE: 05/05/22 22:17:40 GMT FROM: Ron Canterna at U of Wyoming D. Allen, J. Silvey, and R. Canterna report on behalf of the Red Buttes Observatory Team of the FUN GRB Collaboration We observed the position of the GRB050522 (Gotz et al., GCN 3446; Kennea et al., GCN 3452) with the Red Buttes Observatory 24-inch telescope under variable photometric conditions in RI bands on JD2453512. Within a FOV of 8 arcmin of the original INTEGRAL position (GCN 3346) and well within the refined Swift position (GCN 3452) we do not detect the afterglow or no new source down to the following limiting values: UT Time Since Filter Limiting Start GRB (hr) Magnitude 06:54 0:34 R 19.1 07:06 1:06 R 18.9 07:17 1:17 R 19.2 07:22 1:22 R 17.9 07:27 1:27 I 19.2 07:33 1:33 I 18.8 07:38 1:38 I 18.8 08:01 2:01 R 18.9 08:06 2:06 R 19.0 08:12 2:12 R 19.0 08:18 2:18 I 17.7 08:24 2:24 I 17.2 08:30 2:30 I 17.2 10 sigma limiting magnitudes were derived from the USNO-B1.0 catalogue and photometric transformations from Landolt standards. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3457 SUBJECT: XRF 050522: Continued NIR P200 Monitoring DATE: 05/05/23 07:43:10 GMT FROM: S. Bradley Cenko at Caltech Derek B. Fox, S. Bradley Cenko, Kevin Bundy, Chris Conselice (Caltech) and Paul Price (IfA) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: We have again imaged the field of XRF 050522 (Gotz et al, GCN 3446) with the Wide Field Infrared Camera (WIRC) mounted on the 200-inch Palomar Hale Telescope. Observations consisted of 15 images in the Ks band for a total integration time of 30 minutes. The mean epoch of our observations is approximately 3:45 UT 23 May (~ 21.8 hours after the burst). Digital subtraction reveals no significantly variable sources in the Integral error circle. The limiting magnitude of our observations, estimated by comparison with several 2MASS sources in the field, is approximately Ks ~ 18.5. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3459 SUBJECT: GRB050522,optical observation DATE: 05/05/23 10:02:16 GMT FROM: Shouta Maeno at U.of Miyazaki S.maeno,E.sonoda,Y.Tokunaga,M.Yamauchi (University of Miyazaki) "We have observed the field covering the error circle of GRB 050522 (GCN3446 ; INTEGRAL Trigger time is 06:00:21 UT) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 11:15:40 UT on May.22. Observed field of view is 43 arcmin centered on R.A=+13:20:38 Dec=+24:44:13 After co-adding a set of 21 images (11:15:40 - 11:55:21 UT) of 30 sec exposures, we have compared with the USNO A2.0 catalog. Preliminary analysis shows there is no new source brighter than 16.5 mag. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3461 SUBJECT: Swift/UVOT observation of XRF 050522 DATE: 05/05/23 19:25:45 GMT FROM: Alexander Blustin at MSSL-UCL A. Blustin (MSSL), F. Marshall (NASA/GSFC), K. McGowan, S. Rosen, A. Breeveld (MSSL), N. Gehrels (NASA/GSFC) on behalf of the Swift UVOT team INTEGRAL detected XRF 050522 at 06:00:21 UT on 22nd May 2005 (GCN circ 3446). The Swift observatory executed a ToO observation of the INTEGRAL position, and the UVOT began taking data 32879 s after the burst. No new source is detected in the UVOT field of view within the INTEGRAL error circle in the B, U and UVW2 filters down to the following 5-sigma upper limits: Filter Limit Exp (s) T_start T_stop B 19.7 170 33786 34686 U 19.9 425 32879 33779 UVW2 20.2 241 34695 34936 Where T_start and T_stop are in seconds after the burst. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3462 SUBJECT: XRF050522: Radio Observations DATE: 05/05/23 20:59:57 GMT FROM: Patrick B. Cameron at Caltech P. B. Cameron (Caltech) reports on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We observed the field of XRF050522 (GCN#3446) using the Very Large Array at a frequency of 8.46 GHz on May 23.38 UT. We do not detect a radio source within the 2.5 arcmin error circle. We place a 3-sigma upper limit of 153 uJy." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3463 SUBJECT: XRF 050522: Swift XRT refined analysis DATE: 05/05/23 21:37:15 GMT FROM: David Burrows at PSU/Swift M. Capalbi, M. Perri, P. Giommi (ASDC), J. A. Kennea, D. N. Burrows, (PSU), F. Marshall, N. Gehrels (NASA/GSFC) report on behalf of the Swift XRT team: We have analyzed the Swift XRT data from the INTEGRAL XRF 050522 (Gotz et al., GCN 3446). Analysis of 10077 seconds of Photon Counting mode data reveals a weak uncataloged X-ray source within the INTEGRAL error circle. The probability that the source is a fluctuation of the background is about 5.6E-5. The source coordinates are: RA(J2000) = 13 20 35.0 Dec(J2000) = +24 47 18 We estimate an uncertainty of 6 arcseconds radius (90% containment). This source is located 12 arcseconds from the INTEGRAL position reported in GCN 3446. The count rate in the 0.3-10 keV band is 1.6E-03+/-0.5E-03. We cannot yet determine whether this X-ray source is fading. We confirm that the X-ray source outside the INTEGRAL error circle reported previously on the basis of a preliminary analysis (Kennea et al., GCN 3452) is not fading and is no longer considered an afterglow candidate. Further XRT observations are planned. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3464 SUBJECT: XRF050522: NIR observations of XRT candidate DATE: 05/05/23 22:13:56 GMT FROM: Derek Fox at CIT Derek B. Fox (Caltech) reports on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "Inspecting our near-infrared images of the Integral localization region for XRF050522 (Gotz et al., GCN 3446) reveals no Ks-band sources within the XRT localization region of Capalbi et al. (GCN 3463). Our previously reported limit of Ks > 18.5 mag for the afterglow at 2.6 hours after the burst (Fox, Erb & Reddy, GCN 3448; Fox et al., GCN 3457) therefore applies to this candidate. We note that there is a bright star and NOMAD catalog object located 7.75" (~2.6 sigma?) from the XRT candidate position, at RA 13:20:34.565, Dec +24:47:12.61 (J2000)."