//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2572 SUBJECT: GRB 040422: a long GRB detected with INTEGRAL DATE: 04/04/22 08:05:12 GMT FROM: Diego Gotz at IASF-CNR S. Mereghetti, D. Gotz (IASF, Milano), J. Borkowski, M. Beck (ISDC) on behalf of the IBAS Localization Team, S. Shaw and R. Walter on behalf of the INTEGRAL Science data Centre (ISDC) and the INTEGRAL Science Working Team report: An 8 s long GRB has been detected with the INTEGRAL Burst Alert System (IBAS) on April 22 at 06:58:02 UT. The GRB has been detected with IBIS/ISGRI in the 15-200 keV band. Its coordinates (J2000) are: R.A. 18h 42m 00s Dec. +01deg 59' 29'' with an uncertainty of 2.5 arcmin. The preliminary peak flux in the 20-200 keV range is about 2.7 photons/cmsq/s (2.5 x 10^-7 erg/cmsq/s) (1 s integration time). This message can be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2573 SUBJECT: GRB040422: optical and NIR observations at the VLT DATE: 04/04/22 16:39:15 GMT FROM: Daniele Malesani at SISSA-ISAS,Trieste,Italy D. Malesani (SISSA, Trieste), D. Fugazza, G. Ghirlanda (INAF, Brera), on behalf of a larger international collaboration involved in the Swift mission, report: We observed the error box of the INTEGRAL GRB040422 (Mereghetti et al., GCN 2572), starting 2 hours after the burst. Observations were performed at ESO-Paranal, with an excellent seeing of ~0.5". Optical photometry (in the R and I filters) were acquired with VLT+FORS2, while NIR K-band imaging was performed with VLT+ISAAC. Four exposures were needed to cover the entire INTEGRAL error box in the infrared. We find no obvious sources after comparison of our images with the 2MASS catalog. The limit for the 2MASS is estimated to be K < 14.5 (Skrutskie 2001, AAS #198, 33, 827). We estimate our limiting magnitude to be K = 18.5 based on the 2MASS calibration. Further observations are planned tonight at ESO, in order to search for variable sources. Our images are available upon request. We thank the ESO staff at Paranal, and in particular Nancy Ageorges and Leonardo Vanzi, for quickly performing the observations. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2574 SUBJECT: GRB 040422,optical observation DATE: 04/04/22 17:37:06 GMT FROM: Eri Sonoda at U of Miyazaki/Japan S.Maeno, E.Sonoda, M.Yamauchi (University of Miyazaki) "We have observed the field covering the error box of GRB 040422 (INTEGRAL trigger 1758; trigger time 07:45:27 UT) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki.The observation was started 14:06:55 UT on Apl.22. Observed field of view is 43 arcmin centerd on R.A=18,41,38 Dec=+02,04,20d. After co-adding a set of 2 images of 30 sec exposures , we have compared with the USNO A2.0 catalog . Preliminary analysis shows there is no new source brighter than 16.94 mag. in the GRB error box reported by INTEGRAL. " //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2575 SUBJECT: GRB040422, BVRcIc field calibration DATE: 04/04/22 21:25:25 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired shallow BVRcIc all-sky photometry for a 11x11 arcmin field centered on the INTEGRAL coordinates (Mereghetti et al. GCN 2572) for GRB040422 with the USNOFS 1.0-m telescope on one marginal night. Stars brighter than V=12.5 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/grb040422.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 0.03mag and will be improved with additional calibration nights if an afterglow is discovered. 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: 2576 SUBJECT: GRB 040422: ROTSE-IIIb Prompt Optical Limits DATE: 04/04/23 04:02:23 GMT FROM: Eli Rykoff at Univ. of Michigan/ROTSE E. Rykoff reports on behalf of the ROTSE collaboration: The ROTSE-IIIb robotic telescope at McDonald Observatory, Texas, responded automatically to INTEGRAL Trigger #1756 (GRB040422) within 8 s of the receipt of the first alert, and 22.1 s after the beginning of the GRB. Our response sequence consists of 10 5 s exposures, 10 20 s exposures and 200 60 s exposures, all unfiltered. As the burst was behind the galactic plane, we expect significant extinction in our optical passband. Applying the formula from Finkbeiner, Schlegel and Davis (1998), we expect 4.4 magnitudes of extinction in the R-band, although they give a caveat that their calculations "should not be trusted" at galactic latitudes of |b|<5. Our first 5-s exposure started at 06:58:27.21 UT. We visually compared our images to the DSS using the revised error circle as reported by Mereghetti et. al (GCN 2572). We find no objects absent from the DSS to a limiting magnitude of R ~ 16.5, although field crowding creates significant source confusion. Coadding our first 10 images, with an effective exposure time of 110 s, also does not reveal any new objects to a limiting magnitude of R ~ 17.5. Furthermore, no objects in the error box varied significantly over the course of our 3.7 hours of observation. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2577 SUBJECT: GRB040422 : I-band follow-up observation at Lulin Observatory DATE: 04/04/23 05:38:11 GMT FROM: Kuiyun Huang at IANCU GRB040422 : I-band follow-up observation at Lulin Observatory M.K.Yang, K.Y.Huang, W.H. Ip (NCU) Y. Urata and T. Tamagawa (RIKEN) report: " We observed the whole field of INTEGRAL error circle of GRB040422 with 1-m telescope at Lulin Observatory at 16.5 UT April 22 ( about 9.6 hr after the burst). There are four images taken at I band images with exposure time 300 sec. There are no new source was found by comparing DSS-II I band image. The limiting magnitude is 19.7 mag ( SN=3, with USNO-A2.0 red magnitude). This message may be cited " //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2578 SUBJECT: GRB040422, optical observations at Loiano DATE: 04/04/23 19:31:51 GMT FROM: Adalberto Piccioni at Astronomy, Bologna U. A.Piccioni, C.Bartolini, A.Guarnieri (Bologna University), P.Ferrero, G.Pizzichini (IASF-CNR, Sezione di Bologna), and I. Bruni (Bologna Observatory) report: We have observed the error box of GRB040422 (INTEGRAL trigger 1758; GCN 2572, Mereghetti et al.) with the 152 cm Loiano Telescope and the BFOSC camera system on April 22, in non perfect sky conditions (seeing ~ 2 arcsec). Two 600s Rc images have been obtained at 23.092 and 23.099 UT respectively (exposition start epochs). By comparison of the coadded images with the DSS2 catalog we do not identify any obvious source. Our limit magnitude, estimated by PSF photometry, results to be approx 20.1. Coadded images, observation log and a short comment can be retrieved by sftp at ermione.bo.astro.it, username: publicGRB, password: GRB_bo, directory: GRB040422. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2580 SUBJECT: GRB040422: optical observations at CrAO DATE: 04/04/25 13:10:40 GMT FROM: Vasilij Rumjantsev at CrAO V.Rumyantsev (CrAO) and A.Pozanenko (IKI) report: We have observed the error box of GRB 040422 (INTEGRAL trigger 1758, GCN2572, Mereghetti et. al) with 2.6 m Shajn telescope (F/3.9) at Crimean Astrophysical Observatory. The observation start (UT) Apr. 22, 23:37 under poor sky conditions (seeing ~2.5 arcsec). Several R-images taken between (UT) Apr. 22, 23:37 - Apr. 23, 01:39 with exposition 120 s of each frame covered 60% of the GRB error box. Comparison with DSS2 reveals no new objects brighter than limits of DSS2. The limiting magnitude of co-added images is ~21R. Combined mosaic image of GRB error box can be found at http://grb.rssi.ru/GRB040422 This message may be cited //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2581 SUBJECT: GRB040422: optical observations at Xinglong Observatory DATE: 04/04/25 17:55:22 GMT FROM: Yulei Qiu at Nat.Astro.Obs.of China Y.Qiu and J.Hu (NAOC) report: We observed the erro box of GRB040422 with the 0.8 m telescope at Xinglong Observatory, National Astronomical Observatories of China, at 18.24 UT April 22. Four unfiltered images were taken with exposure time 300s. Comparing with DSS-II image, we couldn't find any new source in the combined image. The limiting magnitude of the combined image is about 20.0. This message may be cited.