//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6022 SUBJECT: IPN localization of GRB070124 (short duration, hard spectrum) DATE: 07/01/24 21:25:16 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Mars Odyssey and Konus GRB teams, W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS-Odyssey GRB team, V. Pal'shin, E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, K.Yamaoka, M.Ohno, Y.Fukazawa, T.Takahashi, M.Tashiro, Y. Terada, T.Murakami, and K.Makishima on behalf of the Suzaku WAM team, and I. Mitrofanov, A. Kozyrev, M. Litvak, A. Sanin, V. Tret'yakov and A. Parshukov, on behalf of the HEND-Odyssey GRB team, report: Mars Odyssey (GRS), Konus-Wind, and the Suzaku WAM observed this burst at 31311 s. It had a T90 of 0.8 s, a 20 keV - 3 MeV fluence of ~5 x 10^-6 erg cm^-2, and a hard spectrum with an Epeak ~ 1 MeV. Therefore we believe that this event falls into the short duration class. We have triangulated it to an 87 sq. arcmin. preliminary 3 sigma error box whose coordinates are: RA Dec Center: 221.385 +54.568 Corners: 220.834 +54.187 221.818 +54.825 221.945 +54.947 220.956 +54.310 A Swift ToO observation of this error box has been scheduled. Detailed spectral parameters are being derived and will be reported later. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6023 SUBJECT: Konus-Wind observation of short hard GRB 070124 DATE: 07/01/25 15:00:33 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report: The short hard GRB 070124 localized by the IPN (Hurley et al., GCN 6022), triggered Konus-Wind at T0=31311.621 s UT (08:41:51.621). As observed by Konus-Wind it had a duration of ~0.9 s, a fluence of 5.20(-4.09, +0.71)x10^-6 erg/cm2, and the 16-ms peak flux measured from T0+0.720 s 1.12(-0.94, +0.37)x10^-5 erg/cm2/s (both in the 20 keV - 3 MeV energy range). There is a hint of a weak tail seen up to several tens of seconds after the trigger. The time-integrated spectrum of the burst (from T0 to T0+8.448 s) is well fitted (in the 20 keV - 3 MeV range) by a power law with exponential cutoff model: dN/dE ~ E^(-alpha)*exp(-E*(2-alpha)/Ep) with alpha = 0.93(-0.32, +0.24) and Ep = 994 (-429, +1237) keV (chi2 = 59/68 dof). All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB070124_T31311/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6038 SUBJECT: GRB070124: Swift-XRT Observation DATE: 07/01/26 18:07:16 GMT FROM: Loredana Vetere at PSU L. Vetere, J. Racusin (PSU) report on behalf of the Swift-XRT team: The Swift-XRT began observing the field containing the IPN burst GRB070124 (Hurley et al., GCN 6022) at 2007-01-25 15:36:39.8881 UT almost 31 hr after the trigger. From the analysis of a 7.4 ks photon counting image, 6 sources are found with the following positions and count rates: cts/s Ra Dec 1 1.78E-03+/-6.1E-04 14 44 50.7 +54 34 11.8 2 1.95E-03+/-6.7E-04 14 46 15.2 +54 37 01.8 3 1.34E-03+/-5.8E-04 14 46 18.2 +54 34 23.0 4 1.34E-03+/-5.8E-04 14 44 53.9 +54 26 31.9 5 1.39E-03+/-6.0E-04 14 46 18.6 +54 38 06.5 6 1.66E-03+/-6.8E-04 14 46 07.7 +54 25 51.0 Only source number 4 is actually inside the IPN error box and it is 0.042 arcmin from a USNO-B1.0 Catalog's source. The other five can all be identified with close galaxies. In particular source 5 is UGC9522 an edge-on Sab galaxy with z=0.03866 that is 1.5 arcmin distant from the nearest edge of the IPN error box. At present we cannot tell whether these sources are fading or not. Further observations are planned. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6043 SUBJECT: GRB 070124: Suzaku WAM observation of the prompt emissions DATE: 07/01/27 13:38:03 GMT FROM: Kazutaka Yamaoka at Aoyama Gakuin U K. Yamaoka, S. Sugita (Aoyama Gakuin U.), M. Ohno, T. Takahashi, T. Asano, T. Uehara, Y. Fukazawa (Hiroshima U.), Y. Urata, M. Tashiro, K. Abe, K. Onda, Y. Sato, M. Suzuki (Saitama U.), T. Enoto, R. Miyawaki, K. Makishima (Univ. of Tokyo), M. Suzuki, T. Tamagawa, Y. Terada (RIKEN), K. Nakazawa, M. Kokubun, T. Takahashi (ISAS/JAXA), S. Hong (Nihon U.), E. Sonoda, M. Yamauchi (Miyazaki U.), on behalf of the Suzaku WAM team report: The IPN-localized short GRB 070124 (Hurley et al., GCN 6022) triggered the Suzaku Wide-band All-sky Monitor (WAM), which covers the energy range of 50 keV - 5 MeV, at 08:41:51.035 UT(=T0). The light curve shows two separate pulses with a total duration of about 0.8 seconds. The fluence in 100 - 2000 keV was 3.1(-1.3, +0.4) x 10^-6 erg/cm2, while the 1-s peak flux measured from T0 was 3.4(-0.8, +0.3) photons/cm2/s in the same energy range. The time-averaged spectrum from T0 sec to T0+2 sec is well fitted by a cutoff power law model. dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) alpha -0.19 (-0.81 +0.64), and Epeak 686 (-117, +197) keV. All the quoted errors are at statistical 90% confidence level, while systematic errors are not included. The WAM light curve of this event is available at http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/grb_table.html. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 6069 SUBJECT: GRB070124: Swift-XRT Follow-up Observation DATE: 07/02/02 00:13:08 GMT FROM: Loredana Vetere at PSU L. Vetere, J. Racusin, C. Pagani, D.N. Burrows (PSU) report on behalf of the Swift-XRT team: The entire IPN error box for GRB 070124 (Hurley et al., GCN 6022) has been observed by XRT in three different pointings (target id. 20046, 20048, 20049 for the central, upper and lower part, respectively) with different exposure times: target id Tstart Tend expo 20046 2007-01-25 15:36:39.9 2007-01-31 22:55:58.2 22.5ks 20048 2007-01-31 00:26:23.5 2007-01-31 23:03:57.7 6.1ks 20049 2007-01-31 00:34:25.5 2007-01-31 23:12:56.4 6.5ks Only four sources are detected inside the IPN error box with the following positions (uncertainty of 5 arcsec, radius, 90% containment, including systematic uncertainty) and count rates: Ra(J2000) Dec(J2000) count/s target id 14 45 03.4 +54 27 56.4 (1.2 +/- 0.3)E-03 20046 14 46 09.9 +54 38 58.2 (6.9 +/- 2.6)E-04 20046 14 44 53.2 +54 26 30.5 (1.8 +/- 0.4)E-03 20046 14 44 53.9 +54 26 37.2 (1.8 +/- 0.8)E-03 20048 None of these sources shows a fading behaviour, we thus conclude that XRT did not detect the X-ray afterglow of GRB 070124. This circular is an official product of the Swift-XRT team.