//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7194 SUBJECT: GRB 080120: a long GRB detected by INTEGRAL DATE: 08/01/20 18:51:53 GMT FROM: Sandro Mereghetti at IASF/CNR S.Mereghetti, A.Paizis (IASF-Milano), D.Gotz (CEA-Saclay), A.Manousakis, V.Beckmann, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report: A GRB lasting about 20 s has been detected by IBAS in IBIS/ISGRI data at 17:28:30 UT of January 20. The coordinates (J2000) are: RA = 225.2547 Dec= -10.8854 with an uncertainty of 2 arcmin (90% c.l.). A preliminary analysis gives a peak flux in the 20-200 keV range of about 3 ph/cmq/s (1-s integration time) and a fluence over the same energy range of 1.5e-6 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7195 SUBJECT: GRB080120: Swift XRT position DATE: 08/01/20 23:24:55 GMT FROM: Boris Sbarufatti at INAF-IASF-Pa B. Sbarufatti and V. Mangano (INAF-IASF PA) on behalf of the Swift XRT team Swift XRT started a ToO observation of the INTEGRAL burst GRB080120 at 19:47 UT. The analysis of the initial 1.5 ks of data of the first orbit shows a single bright uncatologued X-ray source in the field at RA (J2000): 15h 01m 03.13s Dec (J2000): -10d 52' 31.8" with an uncertainty of 3.8 arcsec (radius, 90% confidence). This is 46 arcsec away from the GRB position given in Mereghetti et al., GCN Circ. 7194. The source has a count rate of (2.1+-0.1)E-1 counts/s and, assuming a Crab spectrum, a flux of 1E-10 erg/cm2/s. More data are being collected that will be used to determine whether the source is fading and to perform a spectral analysis. This Circular is an official product of the Swift XRT Team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7196 SUBJECT: GRB 080120 : Planned XMM-Newton observation DATE: 08/01/20 23:52:53 GMT FROM: Norbert Schartel at XMM-Newton/ESA XMM-Newton will observe GRB 080120 at location (RA=15h 01m 1.13s, DEC=-10 d 53' 7.4", J2000), starting at 23:00:00 UT, on Jan 20, 2008, for an exposure of about 20000 seconds. ================================================================================================ This message and any attachments are intended for the use of the addressee or addressees only. The unauthorised disclosure, use, dissemination or copying (either in whole or in part) of its content is prohibited. If you received this message in error, please delete it from your system and notify the sender. E-mails can be altered and their integrity cannot be guaranteed. ESA shall not be liable for any e-mail if modified. ================================================================================================= //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7197 SUBJECT: GRB 080120: GROND detection DATE: 08/01/21 08:13:12 GMT FROM: Jochen Greiner at MPI T. Kruehler, J. Greiner, S. McBreen, S. Loew, A. Kuepcue-Yoldas, A. Yoldas (all MPE Garching) report for the GROND team: We started observing GRB 080120 observed by INTEGRAL (Mereghetti et al. 2008, GCN #7194) simultaneously in grizJHK with GROND, mounted at the 2.2m MPI/ESO telescope at La Silla (Chile), at 7:02 UT, about 13.5 hrs after the GRB. At this time, the GRB location was becoming visible at 20 degrees above horizon. We find an optical/NIR source inside the 3.8 arcsec Swift/XRT error circle of the X-ray afterglow (Sbarufatti et al. 2008, GCN #7195). The object is seen in all bands except K, implying a redshift smaller than 3.5. The coordinates are (+-1 arcsec): RA (2000.0) = 15h 01m 03.2s Decl (2000.0) = -10d 52' 30" We estimate rough magnitudes of g'=21.1, r'=20.5, i'=20.0, z'=19.8, J=19.6, H=19.4, K>18.9, calibrated against USNO and 2MASS stars. Given the high airmass and humidity, these estimates may have large errors. No statement about variability can be made at this point. Observations are continuing. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7198 SUBJECT: UVOT detection of GRB080120 DATE: 08/01/21 11:50:51 GMT FROM: Patricia Schady at MSSL/Swift P. Schady (MSSL-UCL) and B. Sbarufatti (INAF-IASF PA) report on behalf of the Swift UVOT team: Swift UVOT started a ToO observation of the INTEGRAL burst GRB080120 at 2008-01-20T19:50 UT, ~2.4hrs after the INTEGRAL trigger (Mereghetti et al., GCN 7194). Observations were taken in the white and v-band only. A new source is detected within the XRT error circle (Sbarufatti & Mangano, GCN7195), in co-added images in both these filters at RA: 15:01:03.276 DEC: -10:52:29.79 with an uncertainty of 0.6 arcsec (90% confidence). This is consistent with the position reported by Kruehler et al. (GCN 7197). The source is seen to decay in the white band and has the following magnitudes and 3-sigma upper limits (in the UVOT photometric system,Breeveld et al., GCN Circ. 6614) Filter Tstart Exp Magnitude (s) (s) white 9257 401 21.45 +/- 0.39 white 14524 679 > 22.08 v 8490 746 20.45 +/- 0.41 v 13232 126 20.53 +/- 0.33 The values quoted above are not corrected for the expected non-negligible Galactic extinction corresponding to a reddening of E(B-V) = 0.10 mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7199 SUBJECT: GRB 080120: Swift-XRT refined analysis DATE: 08/01/21 14:14:40 GMT FROM: Boris Sbarufatti at INAF-IASF-Pa B. Sbarufatti, V. Mangano (INAF-IASF PA) report on behalf of the Swift-XRT team: We have analyzed the 3.9 ks of data of the ToO observation of GRB 080120, started on Jan 20 at 19:47 UT. The refined position of the X-ray source is Ra (J2000): 15h 01m 03.14s Dec (J2000): -10d 52' 30.7" with an uncertainty of 3.7 arcsec (radius, 90% confidence). This is 1.1 arcsec away from the first XRT position given in Sbarufatti & Mangano (GCN Circ. 7195), 47.2 arcsec from the initial INTEGRAL position of Mereghetti et al. (GCN Circ. 7194), and 2.2 arcsec from the optical counterparts reported by Kruehler et al. (GCN Circ, 7197) and by Schady & Sbarufatti (GCN Circ. 7198). The light curve shows an initial flare between 8 and 9 ks from the trigger, followed by a very steep decay (slope 2.9 +/- 0.4). At this decay rate the source will be at a level of 3E-4 counts/s today at 17:30 UT. The average spectrum can be modeled by an absorbed powerlaw with photon index 2.5 +/- 0.3 with a column density of (1.5 +/- 0.6)E21 cm^-2, sligthly in excess with respect to the Galactic value (7.7E20 cm^-2). The observed (unabsorbed) 0.3-10 keV flux is 4.7E-12 (8.2E-12) ergs cm^-2 s^-1. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7200 SUBJECT: VLA radio upper limit on GRB 080120 DATE: 08/01/21 19:57:53 GMT FROM: Poonam Chandra at U Virginia/NRAO Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration: "We used the Very Large Array to observe the field of view toward GRB 080120 (GCN 7194) at a frequency of 8.46 GHz on 2008 January 8th at 21.72 UT. The GRB is undetected and the 2-sigma upper limit on the peak radio flux at the SWIFT-XRT position (GCN 7199) is 100 uJy (rms 50 uJy). The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7201 SUBJECT: XRF 080109 / SN 2008D: GMRT radio observation at 1280 MHz DATE: 08/01/22 08:26:48 GMT FROM: Sabyasachi Pal at GMRT Sabyasachi Pal (NCRA/TIFR), A. Kamble (University of Amsterdam) and Dipankar Bhattacharya report on behalf of a larger collaboration The position of XRF 080109 / SN 2008D was observed by Giant Meterwave Radio Telescope (GMRT) as ToO at 1280 MHz. The observation took place from UT 20.68 to 21.00 January, 2008. It was started after 11.11 days of the beginning of the burst (GCN 7172). The preliminary analysis suggest that the upper limit of the flux density at the position of XRF 080109 (GCN 7190, GCN 7178) is 160 microJy with 235 micro Jy three sigma noise level. One sigma rms noise of the image is 45 microJy. We thank the staffs of the GMRT who have made this ToO observation possible and have given the data to us. GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 7202 SUBJECT: GRB 080120: GROND confirmation of the optical afterglow DATE: 08/01/22 09:10:16 GMT FROM: Thomas Kruehler at MPE/MPI T. Kruehler, J. Greiner, S. McBreen, S. Loew, A. Kuepcue-Yoldas, C. Clemens, A. Yoldas (all MPE Garching) report on behalf of the GROND team: We observed the field of the INTEGRAL burst GRB 080120 (Mereghetti et al. 2008, GCN #7194) with the 2.2 m MPI/ESO telescope equipped with the multi-channel imager GROND. Observations started at 07:04 UTC on the 22nd of January at an airmass of 2.5 and seeing around 1.0". The optical/NIR source (Kruehler et al. 2008, GCN #7197, P. Schady et al. 2008, GCN #7198) inside the XRT-error circle (Sbarufatti et al. 2008, GCN #7195) is still detected, and clearly fading. Fitting a power-law to the two epochs yields a slope around 1.5. A finding chart will be posted at: www.mpe.mpg.de/~jcg/grb080120.html