GRB160225A

This page lists all entries on GRB160225A in GRBweb

Summary IPN Swift GCN 19075 GCN 19076 GCN 19077 GCN 19078 GCN 19080 GCN 19081 GCN 19082 GCN 19083 GCN 19084 GCN 19086 GCN 19087 GCN 19088 GCN 19089 GCN 19091 GCN 19093 GCN 19097 GCN 19102

Summary table
Variable Value Source
T0 14:20:56 UTC GCN_circulars,Swift Det
ra 164.2297° Swift
decl 53.6701° Swift
pos_error 1.81e-04° Swift
T90 157.0 s Swift
T90_start 14:20:56 UTC Swift
fluence 1.60e-06 erg/cm² Swift
T100 157.0 s
GBM_located False
mjd 57443.59787037037 GCN_circulars,Swift Det
IPN table
GRB_name GRB160225A
ra 164.2417°
decl 53.6500°
pos_error 5.00e-02°
Swift table
GRB_name GRB160225A
t_trigger 14:20:56 UTC
ra 164.2297°
decl 53.6701°
pos_error 1.81e-04°
T90 157.0 s
fluence 1.60e-06 erg/cm²
GCN 19075 table
GRB_name GRB160225A
GCN_number 19075
Detection_method Swift Det
t_trigger 14:20:56 UTC
ra 164.2420°
decl 53.6550°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19075 SUBJECT: GRB 160225A: Swift detection of a burst DATE: 16/02/25 14:42:58 GMT FROM: David Palmer at LANL M. H. Siegel (PSU), A. P. Beardmore (U Leicester), P.A. Evans (U Leicester), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), L. M. McCauley (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), T. G. R. Roegiers (PSU), T. Sakamoto (AGU), B. Sbarufatti (INAF-OAB/PSU) and T. N. Ukwatta (LANL) report on behalf of the Swift Team: At 14:20:56 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160225A (trigger=675998). Swift's slew was briefly delayed due to an observing constraint. The BAT on-board calculated location is RA, Dec 164.242, +53.655 which is RA(J2000) = 10h 56m 58s Dec(J2000) = +53d 39' 19" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed multiple spikes over a 50 second interval. The peak count rate was ~1500 counts/sec (15-350 keV) at ~3 sec after the trigger. The XRT began observing the field at 14:34:50.6 UT, 834.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 164.22846, 53.66991 which is equivalent to: RA(J2000) = 10h 56m 54.83s Dec(J2000) = +53d 40' 11.7" with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 60 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (9.69 x 10^19 cm^-2, Willingale et al. 2013), with an excess column of 3.8 (+4.26/-3.38) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 839 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01. Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN 19076 table
GRB_name GRB160225A
GCN_number 19076
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 19076 SUBJECT: GRB 160225A: MASTER-Amur early observations DATE: 16/02/25 14:47:57 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs A.Gabovich, V.Yurkov, Yu.Sergienko, D.Varda Blagoveschensk Educational State University, Blagoveschensk E. Gorbovskoy, N.Tyurina, V. Lipunov, V.Kornilov, P.Balanutsa, A.Kuznetsov, D.Kuvshinov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University D.Buckley, S. Potter, M.Kotze South African Astronomical Observatory K.Ivanov, N.M.Budnev, O.Gres, V.A.Poleshchuk Irkutsk State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian The Instituto de Astrofisica de Canarias MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB160225A 20 sec after notice time and 204 sec after Swift BAT trigger time at 2016-02-25 14:24:20 UT (Siegel et al, 19075). On our first (40s exposure) set we haven't found optical transient within SWIFT error-box (ra=10 56 58 dec=+53 39 17 r=0.050000). The 5-sigma upper limit has been about 17.5 mag The message may be cited.
GCN 19077 table
GRB_name GRB160225A
GCN_number 19077
Detection_method Swift-XRT Det
ra 164.2297°
decl 53.6700°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19077 SUBJECT: GRB 160225A: Enhanced Swift-XRT position DATE: 16/02/25 17:22:20 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 2168 s of XRT Photon Counting mode data and 1 UVOT images for GRB 160225A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 164.22971, +53.66998 which is equivalent to: RA (J2000): 10h 56m 55.13s Dec (J2000): +53d 40' 11.9" with an uncertainty of 1.7 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 19078 table
GRB_name GRB160225A
GCN_number 19078
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19078 SUBJECT: GRB 160225A: TSHAO optical upper limit DATE: 16/02/25 17:37:58 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I. Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the Swift GRB 160225A (Siegel et al., GCN 19075) with Zeiss-1000 (West) 1-m telescope of Tien Shan Astronomical Observatory. We obtained several images in R filter starting on Feb. 25 (UT) 14:46:05. In the first images we do not detect any optical source within enhanced Swift-XRT position (Goad et al., GCN 19077). Preliminary photometry of one of single 90 s image is following Date UT start t-T0 Filter Exp. UL (3sigma) (mid, days) (s) 2016-02-25 14:47:35 0.01903 R 1*90 18.90
GCN 19080 table
GRB_name GRB160225A
GCN_number 19080
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 19080 SUBJECT: GRB 160225A: MITSuME Akeno Optical Observation DATE: 16/02/25 17:53:11 GMT FROM: Taketoshi Yoshii at Tokyo Tech T. Yoshii, Y.Saito, T.Fujiwara, Y. Tachibana, Y.Ono, S.Harita, Y.Muraki, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We searched for the optical counterpart of GRB 160225A (M. H. Siegel et al., GCN Circular #19075) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 2016-01-04 14:24:14 UT (198 sec after the burst) and we detected the optical counterpart in Rc and Ic band. The measured magnitudes were listed as follows. We obtained following limits for the magnitudes. T0+[sec] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------------------------------------------------------- 378 14:27:14 270 > 19.4 18.2 +/- 0.1 17.1 +/- 0.2 ------------------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.
GCN 19081 table
GRB_name GRB160225A
GCN_number 19081
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 19081 SUBJECT: GRB 160225A: MITSuME Okayama Optical Observation DATE: 16/02/25 23:50:50 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of MITSuME and OISTER collaboration: We observed the field of GRB 160225A (Siegel et al., GCNC 19075) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2016-02-25 14:26:51 UT (~5.9 min after the burst). We detected the previously reported afterglow (Yoshii et al., GCNC 19080) in Rc and Ic bands. Photometric results and three sigma upper limit of the OT are listed below. We used SDSS-DR7 catalog for flux calibration. #T0+[day] MID-UT T-EXP[sec] g' Rc Rc_err Ic Ic_err ------------------------------------------------------------------ 0.00777 14:32:08 540.0 >19.4 18.6 0.2 17.8 0.2 ------------------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 19082 table
GRB_name GRB160225A
GCN_number 19082
Detection_method Other
ra 10.0000°
decl 53.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19082 SUBJECT: GRB 160225A: WHT LIRIS observations DATE: 16/02/26 00:01:37 GMT FROM: Klaas Wiersema at U Leicester K. Wiersema, N. Tanvir (U. of Leicester), A. Levan (U. of Warwick) and G. Pugliese (API/UvA) report: We observed the position of GRB 160225A (Siegel et al. GCN 19075) with the 4.2m William Herschel Telescope (WHT). Using the LIRIS instrument we obtained 20x60 sec in Y band, 20x60 sec in J band and 60x20 sec in Ks band. Observations started at 19:57 UT on 25 February 2016 (i.e. 5.62 hours after burst). A point source is clearly detected near the enhanced XRT position (Goad et al. GCN 19077), at position: RA (J2000): 10 56 55.18 Dec (J2000): +53 40 13.7 with an uncertainty of 0.5 arc seconds. The source is seen in all three filters, and has magnitudes J~20.6 mag and Ks~19.2 mag (Vega magnitudes, calibrated using 2MASS objects in the field). We acknowledge excellent support from Raine Karjalainen (ING).
GCN 19083 table
GRB_name GRB160225A
GCN_number 19083
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19083 SUBJECT: GRB 160225A: NOT optical observations DATE: 16/02/26 02:10:23 GMT FROM: Dong Xu at NAOC/CAS D. Xu (NAOC/CAS), D. Malesani (DARK/NBI), N. Tanvir (U. of Leicester), A. Kvammen (NOT) report on behalf of a large collaboration: We observed the field of GRB 160225A (Siegel et al. GCN 19075) using the 2.56m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 23:31:27 UT on 2016-02-25 (i.e., 8.56 hr post-burst) and 9x200s exposures were obtained in the Sloan r- and i-band, respectively. The optical afterglow is detected at the WHT position (Wiersema et al., GCN 19082) and presumably also the MITSuME position (Yoshii et al. GCN 19080). We measured m(r)=23.25 +/- 0.15 at 8.86 hr post-burst and m(i) = 22.55 +/- 0.07 at 9.48 hr post-burst, calibrated with nearby SDSS stars.
GCN 19084 table
GRB_name GRB160225A
GCN_number 19084
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19084 SUBJECT: GRB 160225A: Swift-XRT refined Analysis DATE: 16/02/26 02:36:49 GMT FROM: Phil Evans at U of Leicester J.A. Kennea (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU) and M.H. Siegel report on behalf of the Swift-XRT team: We have analysed 9.4 ks of XRT data for GRB 160225A (Siegel et al. GCN Circ. 19075), from 841 s to 31.8 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 19077). The light curve can be modelled with a power-law decay with a decay index of alpha=0.91 (+/-0.06). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.11 (+/-0.14). The best-fitting absorption column is 5.7 (+3.0, -2.7) x 10^20 cm^-2, in excess of the Galactic value of 9.7 x 10^19 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.0 x 10^-11 (3.6 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 5.7 (+3.0, -2.7) x 10^20 cm^-2 Galactic foreground: 9.7 x 10^19 cm^-2 Excess significance: 2.9 sigma Photon index: 2.11 (+/-0.14) If the light curve continues to decay with a power-law decay index of 0.91, the count rate at T+24 hours will be 0.013 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.9 x 10^-13 (4.5 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00675998. This circular is an official product of the Swift-XRT team.
GCN 19086 table
GRB_name GRB160225A
GCN_number 19086
Detection_method Optical
ra 164.2475°
decl 53.6792°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19086 SUBJECT: GRB 160225A: Xinglong TNT optical observation DATE: 16/02/26 03:35:09 GMT FROM: L.P. Xin at NAOC L. P. Xin, X. F. Wang, J. Y. Wei, X. H. Han, Y. L. Qiu, J. Wang, C. Wu, J. S. Deng report: We observed GRB 160225A (Siegel et al. GCN 19075) with 80cm TNT telescope, located at Xinglong obervatory, China, at 14:24:26 UT, about 3.5 min after the burst. The optical afterglow (Wiersema et al., GCN 19082) near the enhanced XRT errorbox (Goad et al., GCN 19082) was detected in our white and R-band images. The brightness of the optical afterglow is about 17.58 mag at the mid time of 3.67 min afer the burst, calibrated by the USNO B1.0 star (RA=10:56:59.4 DEC=+53:40:45 R2=15.26mag). We thank excellent support of the Xinglong 80cm TNT staff, particularly YunPeng Wang. The message may be cited.
GCN 19087 table
GRB_name GRB160225A
GCN_number 19087
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19087 SUBJECT: GRB 160225A: Swift/UVOT Upper Limits DATE: 16/02/26 05:10:10 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 160225A 839 s after the BAT trigger (Siegel et al., GCN Circ. 19075). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 19077) or the previously reported optical position (Wierema, et al., GCN Circ. 19082) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 839 989 147 >20.7 white 839 2657 342 >21.1 v 1121 2708 194 >19.9 b 1047 2632 194 >20.8 u 1022 2608 156 >19.9 w1 998 3036 311 >20.1 m2 1494 2912 236 >20.2 w2 1446 2683 78 >20.0 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN 19088 table
GRB_name GRB160225A
GCN_number 19088
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 19088 SUBJECT: GRB 160225A: RATIR Optical and NIR Observations DATE: 16/02/26 07:25:27 GMT FROM: Nat Butler at Az State U Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 160225A (Siegel, et al., GCN 19075) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2016/02 26.13 to 2016/02 26.28 UTC (12.72 to 16.34 hours after the BAT trigger), obtaining a total of 2.47 hours exposure in the r and i bands and 1.04 hours exposure in the Z, Y, J, and H bands. We detect the WHT afterglow candidate (Wiersema, et al., GCN 19082), and find it to have faded. In comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following detections and upper limits (3-sigma): r > 24.09 i = 23.03 +/- 0.16 Z = 22.17 +/- 0.19 Y > 22.35 J = 22.06 +/- 0.33 H > 21.74 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The r-band faintness suggests that this may be a moderate to high-z source. Fitting Milky Way, LMC, and SMC Exctinction Laws in Addition to the IGM (see, Littlejohns, et al. 2014), we find a photo-z of 5.54 (+0.35,-5.11; 90% conf.). Hence, a high-z solution is preferred, but a low-z origin is not ruled out. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 19089 table
GRB_name GRB160225A
GCN_number 19089
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 19089 SUBJECT: GRB 160225A: MASTER-Amur observations DATE: 16/02/26 09:27:38 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs N.Tyurina, E. Gorbovskoy, V. Lipunov, V.Kornilov, P.Balanutsa, A.Kuznetsov, D.Kuvshinov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A.Gabovich, V.Yurkov, Yu.Sergienko, D.Varda Blagoveschensk Educational State University, Blagoveschensk D.Buckley, S. Potter, M.Kotze South African Astronomical Observatory K.Ivanov, N.M.Budnev, O.Gres, V.A.Poleshchuk Irkutsk State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian The Instituto de Astrofisica de Canarias MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB160225A 20 sec after notice time and 204 sec after Swift BAT trigger (Siegel et al, 19075) time at 2016-02-25 14:24:20 UT (Gabovich et al, 19076). We did not see any OT brighter 2-sigma. Our unfiltered camera sensitive up to 10 mk. Id t_start-t_trigger t_mean-t_trig Exp.time Limit s s s unfiltered 767291 204 224 40 17.4 767293 256 281 50 17.6 767295 318 348 60 17.0 769139 318 768 600 18.7 769244 318 1187 1200 19.0 Our unfiltered magnitude calibrated to USNOB1 stars as m =0.2B + 0.8R . The message may be cited.
GCN 19091 table
GRB_name GRB160225A
GCN_number 19091
Detection_method Swift-BAT Det
ra 164.2170°
decl 53.6590°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19091 SUBJECT: GRB 160225A: Swift-BAT refined analysis DATE: 16/02/26 15:16:08 GMT FROM: Takanori Sakamoto at AGU D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. H. Siegel (PSU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160225A (trigger #675998) (Siegel, et al., GCN Circ. 19075). The BAT ground-calculated position is RA, Dec = 164.217, 53.659 deg which is RA(J2000) = 10h 56m 52.1s Dec(J2000) = +53d 39' 33.6" with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 35%. The mask-weighted light curve shows a multiple peak structure starting at T0-30 sec and ending at T0+50 sec. Although there is a hint of a emission after T0+100 sec, no data are available after T0+150 sec because the spacecraft slewed away to the GRB. T90 (15-350 keV) is 157 +- 70 sec (estimated error including systematics). The time-averaged spectrum from T-30.38 to T+135.29 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.55 +- 0.23. The fluence in the 15-150 keV band is 1.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+37.13 sec in the 15-150 keV band is 1.0 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/675998/BA/
GCN 19093 table
GRB_name GRB160225A
GCN_number 19093
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 19093 SUBJECT: GRB 160225A: Continued RATIR Optical and NIR Observations DATE: 16/02/26 16:52:29 GMT FROM: Nat Butler at Az State U Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 160225A (Siegel, et al., GCN 19075) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2016/02 26.13 to 2016/02 26.51 UTC (12.72 to 21.97 hours after the BAT trigger), obtaining a total of 6.38 hours exposure in the r and i bands and 2.68 hours exposure in the Z, Y, J, and H bands. With continued exposure (see, Butler, et al., GCN 19088), we now detect the WHT afterglow candidate (Wiersema, et al., GCN 19082) in all bands. In comparison with the SDSS DR9 and 2MASS catalogs, we find: r = 23.84 +/- 0.18 i = 23.13 +/- 0.11 Z = 22.71 +/- 0.18 Y = 22.40 +/- 0.22 J = 22.44 +/- 0.26 H = 22.04 +/- 0.26 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. We have fitted our photometry with a power-law source and redshifted Milky Way, LMC, or SMC extinction laws and IGM extinction (see, Littlejohns, et al. 2014). The detection in r conclusively rules out solutions with z > 5. However, there are a range of solutions up to z ~ 4.5. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 19097 table
GRB_name GRB160225A
GCN_number 19097
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19097 SUBJECT: GRB 160225A: LOAO optical upper limit DATE: 16/02/27 12:16:10 GMT FROM: Soomin Jeong at IAA-CSIC S. Jeong (SKKU/IAA-CSIC), M. Im (SNU), Y. Urata (NCU), I. H. Park (SKKU) on behalf of larger collaboration: We observed the field of GRB 160225A (Siegel, et al., GCN 19075) with the 1m telescope of Mt. Lemmon Optical Astronomy Observatory (LOAO) in Arizona. The series of images are taken in R filter starting on Feb. 26 02:45:36 UT (~12.4 hr post burst). We do not detect any optical afterglow candidate within the XRT enhanced error circle (Goad et al., GCN 19077) down to the following magnitudes calibrated with the nearby USNO-B1.0 stars. The non-detection is consistent with the previous UL report in similar epoch (Butler, et al., GCN 19088). Mid Time Exposure Filter Magnitude (hr) (s) ------------------------------------------------------- 12.83 9x300 R > 21.5 ------------------------------------------------------- USNO-B1.0_id R1 R2 1436-0208445 14.73 15.26 14.995 1436-0208447 13.55 13.74 13.645
GCN 19102 table
GRB_name GRB160225A
GCN_number 19102
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19102 SUBJECT: GRB 160225A: TSHAO optical afterglow detection DATE: 16/02/27 21:44:21 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I. Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the Swift GRB 160225A (Siegel et al., GCN 19075) with Zeiss-1000 (West, East) 1-m telescopes of Tien Shan Astronomical Observatory. We obtained several images in R filter starting on Feb. 25 (UT) 14:45:56. In the first images we do not detect any optical source (Mazaeva et al., GCN 19078). In combine images we detect afterglow (Yoshiiet al., GCN 19080; Kuroda al., GCN 19081; Wiersema al., GCN 19082). Preliminary photometry of combined images is following Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) *2016-02-25 14:45:56 0.07022 R 87*90 20.75 0.16 21.4 2016-02-25 15:30:59 0.09576 R 77*90 21.36 0.20 21.9 2016-02-25 17:58:10 0.18146 R 52*90 n/d n/a 21.7 *) Zeiss-1000 West telescope observations Photometry is based on SDSS-DR9 nearby stars SDSS-DR9_id R(Lupton) J105614.20+533500.1 15.35 J105714.63+533304.9 14.36 J105658.91+533304.1 15.77