GRB230414B

This page lists all entries on GRB230414B in GRBweb

Summary IPN Swift GCN 33612 GCN 33613 GCN 33614 GCN 33616 GCN 33617 GCN 33618 GCN 33620 GCN 33621 GCN 33622 GCN 33623 GCN 33625 GCN 33626 GCN 33628 GCN 33629 GCN 33630 GCN 33631 GCN 33634 GCN 33636 GCN 33637 GCN 33641 GCN 33642 GCN 33645 GCN 33648 GCN 33660

Summary table
Variable Value Source
T0 16:14:21 UTC GCN_circulars,Swift Det
ra 181.0944° Swift
decl 53.1543° Swift
pos_error 2.46e-04° Swift
redshift 3.5680
GBM_located False
mjd 60048.67663194444 GCN_circulars,Swift Det
IPN table
GRB_name GRB230414B
ra 181.0708°
decl 53.1333°
pos_error 5.00e-02°
redshift 3.5680
Swift table
GRB_name GRB230414B
t_trigger 16:14:21 UTC
ra 181.0944°
decl 53.1543°
pos_error 2.46e-04°
GCN 33612 table
GRB_name GRB230414B
GCN_number 33612
Detection_method Swift Det
t_trigger 16:14:21 UTC
ra 181.0710°
decl 53.1270°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33612 SUBJECT: GRB 230414B: Swift detection of a burst DATE: 23/04/14 16:27:28 GMT FROM: Antonino D'Ai at IASF-PA A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (GSFC/UMBC/CRESSTII), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 16:14:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230414B (trigger=1164180). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 181.071, +53.127 which is RA(J2000) = 12h 04m 17s Dec(J2000) = +53d 07' 36" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~400 counts/sec (15-350 keV), at ~5 sec after the trigger. The XRT began observing the field at 16:16:29.8 UT, 128.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 181.09569, 53.15401 which is equivalent to: RA(J2000) = 12h 04m 22.97s Dec(J2000) = +53d 09' 14.4" with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 110 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 https://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 (1.68 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 2.8 (+2.36/-2.05) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 133 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 none of the XRT error circle. 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 0.017. Burst Advocate for this burst is A. D'Ai (antonino.dai AT inaf.it). 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/)
GCN 33613 table
GRB_name GRB230414B
GCN_number 33613
Detection_method Swift-XRT Other
ra 181.0944°
decl 53.1543°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33613 SUBJECT: GRB 230414B: Prompt enhanced Swift-XRT position DATE: 23/04/14 16:50:41 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using promptly downlinked XRT event data for GRB 230414B, we find an enhanced XRT position of the afterglow: RA, Dec: 181.09439, 53.15428 which is equivalent to: RA (J2000) = 12 04 22.65 Dec (J2000) = +53 09 15.4 with an uncertainty of 1.9 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/1164180. Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team.
GCN 33614 table
GRB_name GRB230414B
GCN_number 33614
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33614 SUBJECT: Swift GRB 230414B: Global MASTER-Net observations report DATE: 23/04/14 16:50:47 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 230414B ( A. D'Ai et al., GCN 33612) errorbox 1644 sec after notice time and 1703 sec after trigger time at 2023-04-14 16:42:44 UT, with upper limit up to 16.1 mag. Observations started at twilight. The observations began at zenith distance = 32 deg. The sun altitude is -9.8 deg. The galactic latitude b = 63 deg., longitude l = 138 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2210174 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 1793 | MASTER-Kislovodsk | C | 180 | 16.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 33616 table
GRB_name GRB230414B
GCN_number 33616
Detection_method Optical
ra 181.0946°
decl 53.1546°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33616 SUBJECT: GRB 230414B: Nanshan/HMT optical afterglow detection DATE: 23/04/14 17:26:09 GMT FROM: Dong Xu at NAOC/CAS T.H. Lu (NAOC), Z.P. Zhu (NAOC, HUST), S.Y. Fu, S.Q. Jiang, X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report: We observed the field of GRB 230414B detected by Swift (A. D'Ai et al., GCN 33612) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 16:19:34 UT on 2023-04-14, i.e., 313s after the Swift/BAT trigger, and a series of 20 s, 40 s, 60 s, 90 s exposures have been obtained without any filter. Observations are still ongoing. We detected an uncatalogued and varying optical transient (OT) at coordinates R.A. (J2000) = 12:04:22.70 Dec.(J2000) = +53:09:16.38 with an uncertainty of ~ 0.5 arcsec, and it has m(r) ~19.3 mag in the co-added image from the initial exposures, calibrated with the nearby PanSTAR field in the Sloan r-filter. We thus think that the OT is the optical afterglow of the burst.
GCN 33617 table
GRB_name GRB230414B
GCN_number 33617
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 33617 SUBJECT: GRB 230414B (correction GRB name in the GCN 33615): Mondy optical afterglow candidate DATE: 23/04/14 17:27:27 GMT FROM: Alexei Pozanenko at IKI, Moscow N. Pankov (HSE), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin (IKI) report on behalf of GRB IKI FuN: The correct name of GRB in the GCN 33615 should be 230414B. We apologize for possible inconvenience.
GCN 33618 table
GRB_name GRB230414B
GCN_number 33618
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 33618 SUBJECT: GRB 230414B: GROWTH India Telescope afterglow confirmation DATE: 23/04/14 17:56:54 GMT FROM: Varun Bhalerao at Indian Inst of Tech D. Raman (IITB), A. Suresh (IITB), V. Swain (IITB), H. Kumar (IITB), G. Waratkar(IITB), V. Bhalerao (IITB), G.C. Anupama(IIA), S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team: We observed the field of GRB 230414B detected by Swift ( A. D'Ai et al., GCN 33612) with 0.7m GROWTH-India Telescope (GIT). GIT automatically triggered at 16:17:41 UT, i.e., 3.3 min after the Swift/BAT trigger. We obtained frames in the r' and i' band of 120 sec each. We detected an uncatalogued source at RA 12:04:22.65, Dec: 53:09:15.4 with an uncertainty of 1.9 arcsec. There is no minor planet present at this position. The photometric results follow as: ---------------------------------------------------------------------- JD (mid) | T_mid-T0 (min) | Filter | Magnitude (AB) | ---------------------------------------------------------------------- 2460049.18505852 | 12.13 | r' | 19.45 +/- 0.08 | 2460049.18674811 | 14.56 | r' | 19.47 +/- 0.08 | 2460049.19372952 | 24.62 | r' | 19.91 +/- 0.09 | 2460049.18854398 | 17.15 | i' | 19.08 +/- 0.13 | ---------------------------------------------------------------------- The results are consistent with (T.H. Lu et al., GCN #33616; N. Pankov et al., GCN #33617).We encourage photometric for further confirmation and spectroscopic follow-up for redshift measurement. The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction. The GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.
GCN 33620 table
GRB_name GRB230414B
GCN_number 33620
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33620 SUBJECT: GRB 230414B: 1.3m DFOT Optical observations DATE: 23/04/14 20:31:18 GMT FROM: Ankur Ghosh at ARIES Ankur Ghosh, Dimple, Kuntal Misra, Rahul Gupta, Amit K Ror, Amar Aryan, and Shashi B. Pandey (ARIES) report: We observed the field of GRB 230414B detected by *Swift* (D'Ai et al. 2023, GCN 33612) using the 1.3m Devasthal Fast Optical Telescope (DFOT) located at the Devasthal observatory of Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, India. We have taken multiple frames with an exposure time of 300 seconds in several passbands. We clearly detected the GRB afterglow within the enhanced *Swift*-XRT error circle (Evans et al. 2023, GCN 33613) in each image. The estimated preliminary magnitude is the following: Date_Start_UT T_start-T0 (days) Filter Exp time (sec) magnitude ============================================================== 2023-04-14 17:13:30 ~ 0.041 R 300 20.06 +/- 0.06 The detection of the GRB afterglow is consistent with Lu et al. 2023, GCN 33616, Pankov et al. 2023, GCN 33617, and Raman et al. 2023, GCN 33618. The magnitude is not corrected for the Galactic and host extinction in the direction of the GRB afterglow. Photometric calibration is performed using the standard stars from the USNO-B1.0 catalog.
GCN 33621 table
GRB_name GRB230414B
GCN_number 33621
Detection_method Swift-XRT Det
ra 181.0947°
decl 53.1543°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33621 SUBJECT: GRB 230414B: Enhanced Swift-XRT position DATE: 23/04/14 21:53:00 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 940 s of XRT Photon Counting mode data and 2 UVOT images for GRB 230414B, 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 = 181.09469, +53.15434 which is equivalent to: RA (J2000): 12h 04m 22.73s Dec (J2000): +53d 09' 15.6" with an uncertainty of 2.2 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 33622 table
GRB_name GRB230414B
GCN_number 33622
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33622 SUBJECT: GRB 230414B: SAO RAS optical observations DATE: 23/04/14 22:41:49 GMT FROM: Moskvitin Alexander at SAO RAS A. S. Moskvitin (SAO RAS) and V. P. Goranskij (SAI, Moscow University) report on behalf of a larger collaboration: We observed the field of GRB 230414B detected by Swift (D'Ai et al., GCN 33612) with the SAO RAS 1-m telescope Zeiss-1000 + CCD photometer. We obtained several images in Rc band. The GRB OT (Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618; Ghosh et al., GCN 33620) is clearly detected in the stacked frame with the brightness of R = 19.8 +/- 0.1 (T_mid - T0 = 3.68 hours). This preliminary photometry is based on R2 magnitudes of nearby USNO-B1 stars. The OT magnitude is not corrected for the Galactic extinction.
GCN 33623 table
GRB_name GRB230414B
GCN_number 33623
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33623 SUBJECT: GRB 230414B: slow optical light curve decay DATE: 23/04/14 23:47:27 GMT FROM: Daniele B Malesani at Radboud U D. B. Malesani (Radboud Univ. and DAWN/NBI), A. de Ugarte Postigo (OCA), L. Izzo (DARK/NBI), D. Xu (NAOC), Z.P. Zhu (NAOC, HUST), J. Acevedo Barroso (EPFL), C. Lemon (EPFL), Z. Gray (AOP), F. Neira (EPFL), report on behalf of a larger collaboration: We observed the optical afterglow (Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618; Ghosh et al., GCN 33620; Moskvitin et al., GCN 33622) of GRB 230414B (D'Ai et al., GCN 33612) with the Nordic Optical Telescope (NOT) equipped with the ALFOSC imager. In a single r-band image obtained on 2023 Apr 14.95 UT (6.57 hr after the GRB), we clearly detect the optical afterglow at a magnitude r = 19.42 +- 0.02 (AB), calibrated against nearby stars from the Pan-STARRS catalog. Comparing to earlier magnitudes from the above mentioned GCNs, our measurement indicates a slow decay or plateau phase, as already hinted by the magnitudes reported by Moskvitin et al. (GCN 33622).
GCN 33625 table
GRB_name GRB230414B
GCN_number 33625
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33625 SUBJECT: GRB 230414B: Dabancheng/GHOST optical observations DATE: 23/04/15 05:39:21 GMT FROM: Zipei Zhu at NAOC Z.P. Zhu (NAOC, HUST), S.Y. Fu, S.Q. Jiang, X. Liu, T.H. Lu, D Xu (NAOC), S.W. Luo, M.M. Yang, Z. K. Feng (Gaoyazi Obs.) reoport: We observed the field of GRB 230414B detected by Swift (A. D'Ai et al., GCN 33612) with the GHOST-0.5m telescope located at Dabancheng, Xinjiang, China. Observations started at 18:27:56 UT on 2023-04-14, i.e., 2.23 hr after the Swift/BAT trigger, and 20x120 s images were obtained all in the Sloan r filter. The afterglow reported before (Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618; Ghosh et al., GCN 33620; Moskvitin et al., GCN 33622; Malesani et al., GCN 33623) is clearly detected in the stacked image with a brightness of r = 20.1 +/- 0.1 mag, calibrated with nearby stars from the Pan-STARRS catalog.
GCN 33626 table
GRB_name GRB230414B
GCN_number 33626
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33626 SUBJECT: GRB 230414B: Swift-XRT refined Analysis DATE: 23/04/15 05:39:47 GMT FROM: Phil Evans at U of Leicester M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), M. Capalbi (INAF-IASFPA) and A. D'Ai report on behalf of the Swift-XRT team: We have analysed 6.2 ks of XRT data for GRB 230414B (D'Ai et al. GCN Circ. 33612), from 112 s to 34.3 ks after the BAT trigger. The data comprise 17 s in Windowed Timing (WT) mode (the first 10 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 33613). The late-time light curve (from T0+4.4 ks) is consistent with a constant source of mean count rate 2.2e-01 ct/sec. A power-law fit gives an index of -0.07 (+/-0.15). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.97 (+0.16, -0.10). The best-fitting absorption column is 1.74 (+3.05, -0.07) x 10^20 cm^-2, consistent with the Galactic value of 1.7 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.2 x 10^-11 (3.4 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.74 (+3.05, -0.07) x 10^20 cm^-2 Galactic foreground: 1.7 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 1.97 (+0.16, -0.10) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01164180. This circular is an official product of the Swift-XRT team.
GCN 33628 table
GRB_name GRB230414B
GCN_number 33628
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33628 SUBJECT: GRB 230414B: AbAO optical observations DATE: 23/04/15 11:15:00 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), N. Pankov (HSE, IKI), D. Datashvili (AbAO), V. R. Ayvazian (AbAO), report on behalf of GRB IKI FuN: We observed the field of Swift GRB 230414B (D'Ai et al., GCN 33612) with AS-32 telescope of Abastumani observatory (AbAO) in R-filter starting on Apr. 14 (UT) 16:46:07. We detected the afterglow (Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618; Ghosh et al., GCN 33620; Moskvitin et al., GCN 33622; Malesani et al., GCN 33623; Zhu et al., GCN 33625). Preliminary photometry of the object is following Date UT start t-T0 Filter Exp. OT Err. UL(3sigma) (mid, days) (s) 2023-04-14 16:46:07 0.06094 R 112*60 19.73 0.05 22.3 The photometry is based on nearby USNO-B1.0 stars.
GCN 33629 table
GRB_name GRB230414B
GCN_number 33629
Detection_method Other
redshift 3.5680
Circular_text TITLE: GCN CIRCULAR NUMBER: 33629 SUBJECT: GRB 230414B: Redshift from OSIRIS/GTC DATE: 23/04/15 12:00:39 GMT FROM: J. F. Agui Fernandez at IAA-CSIC J. F. Agui Fernandez (IAA-CSIC), C. C. Thoene (ASU-CAS), A. de Ugarte Postigo (OCA), R. Scarpa, A. Marante and A. L. Cabrera Lavers (GTC, IAC) report: We observed the afterglow of GRB 230414B (D'Ai et al. GCN 33612; Evans et al. GCN 33613; Lipunov GCN 33614; Pankov et al. GCN 33615; Lu et al. GCN 33616; Raman et al. GCN 33618; Ghosh et al. GCN 33620; Goad GCN 33621; Moskvitin et al. GCN 33622; Malesani et al. GCN 33623; Zhu et al. GCN 33625) with OSIRIS at the 10.4m GTC telescope, at the Roque de los Muchachos Observatory (La Palma, Spain). Observations consisted of 4x1200 s spectroscopy with grism R1000B, covering the spectral range between 3700 and 7800 AA. In a preliminary analysis we identify a broad absorption that we interpret as due to Ly-alpha. We also see several transitions coincident with SI, SiII, SiII*, OI, CII, NiII, SiIV, CIV and FeII, all of them at a common redshift of z = 3.568, which we interpret as the redshift of the GRB. This GCN is in honor of the great Alex Kann, the WiseGRBguy. It happened on the day he was buried while some of his colleagues were standing at the grave saying farewell. Even the Universe paid its tribute to him.
GCN 33630 table
GRB_name GRB230414B
GCN_number 33630
Detection_method Optical
ra 181.0943°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33630 SUBJECT: GRB 230414B: Bassano Bresciano Observatory optical observations DATE: 23/04/15 14:51:21 GMT FROM: Ulisse Quadri at Bassano Bresciano Obs U.Quadri, L.Strabla report: We imaged the field of GRB 230414B detected by SWIFT(trigger 1164180) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy. Member of: AAVSO - American Association of Variable Star Observers. UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili. The observations started 236.82 min min after the GRB trigger, at the end of twilight, with our Newton telescope D=250 mm F/D=4.8. We co-added 6 series of 30 exposures of 60 sec each. Start T0+ End T0+ Vlim 236.82 min 323.07 min 20.5 We detected a (fading) afterglow in the error box of the XRTcandidate. A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), et al. at the following position (+/- 2 arcsec): RA (J2000) = 12h 04m 22.64s DEC(J2000) = +53° 09' 16.4" The results of our photometry are: ----------------------------------------- Date UT CR-mag Middle +/- 0.05 ----------------------------------------- 2023 04 14.85273 19.76 2023 04 14.86022 19.74 2023 04 14.86771 19.76 2023 04 14.87519 20.02 2023 04 14.88268 19.96 2023 04 14.89017 20.01 ----------------------------------------- Magnitudes were estimated with the UCAC4 cat. and are not corrected for galactic dust extinction. The images are available at: http://www.osservatoriobassano.org/GRB.asp The message may be cited.
GCN 33631 table
GRB_name GRB230414B
GCN_number 33631
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33631 SUBJECT: GRB 230414B: Lulin 40cm-SLT optical limit DATE: 23/04/15 15:36:17 GMT FROM: Ting-Wan Chen at MPE T.-W. Chen (TUM/MPA), S. Yang (HNAS), C.-S. Lin, C.-C. Ngeow, H.-Y. Hsiao, W.-J. Hou, Y.-C. Pan, H.-C. Lin, and J.-K. Guo (IANCU) report: We observed the field of GRB 230414B (D'Ai et al. GCN 33612; Evans et al. GCN 33613; Lipunov GCN 33614; Pankov et al. GCN 33615; Lu et al. GCN 33616; Raman et al. GCN 33618; Ghosh et al. GCN 33620; Goad GCN 33621; Moskvitin et al. GCN 33622; Malesani et al. GCN 33623; Zhu et al. GCN 33625; Gupta et al. GCN 33627; Belkin et al. GCN 33628; Agui Fernandez et al. GCN 33629; Quadri & Strabla GCN 33630), using the 40cm-SLT at Lulin Observatory, Taiwan to obtain r-band images as part of the Kinder collaboration (Chen et al., AstroNote 2021-92). The first epoch of observations started at 17:01 UT on 14 of April 2023 (MJD = 60048.709), 46 minutes (0.032 days) after the Swift/BAT trigger. The images were combined from 6 frames with a 300-second exposure time for the r band, taken under seeing conditions of an average of 1.85" and at a median airmass of 1.37. We note that the QE of the current testing camera mounted on the SLT is much shallower than the previous one. After template subtraction using the SDSS image, we do not detect a source at the position of the afterglow down to the following preliminary 2.5-sigma limit (in the AB system): r > 19.18 mag. The given limit is derived based on calibrating against SDSS field stars and is not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.01 mag in the direction of the burst (Schlafly & Finkbeiner 2011).
GCN 33634 table
GRB_name GRB230414B
GCN_number 33634
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33634 SUBJECT: GRB 230414B: Montarrenti Observatory late time optical afterglow detection DATE: 23/04/16 13:28:28 GMT FROM: Simone Leonini at Monarrenti Obs Simone Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy), M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, Department of Physics and Astronomy) and B. De Simone (Universita' degli Studi Di Salerno) report: We observed the field of GRB 230414B (Swift trigger 1164180, A. D'Ai et al. GCN 33612; Lipunov GCN 33614; Pankov et al. GCN 33615; Lu et al. GCN 33616; Raman et al. GCN 33618; Ghosh et al. GCN 33620; Moskvitin et al. GCN 33622; Malesani et al. GCN 33623; Zhu et al. GCN 33625; Gupta et al. GCN 33627; Belkin et al. GCN 33628; Agui Fernandez et al. GCN 33629; Quadri & Strabla GCN 33630; Chen et al. GCN 33631) with the automatic 0.53m RC telescope + U47 detector at Montarrenti Observatory (Siena, Italy, IAU code C88). The observations were started in a windy night under mediocre seeing conditions at 2023-04-15 21:18:31 UT (approximately 29 hours after burst) stacking 20x30s unfiltered CCD exposures. The optical afterglow was detected at the following position: RA (J2000) 12h 04m 22.68s +/-0.22 Decl. (J2000) +53° 09' 17.2" +/-0.28 Preliminary photometry is obtained using nearby USNO-B1 stars as follows: 2023 Apr 15.89133 UT (21:23:31 mid-time) CR=21.53 +/-0.18 Measures are not corrected for galactic dust extinction
GCN 33636 table
GRB_name GRB230414B
GCN_number 33636
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 33636 SUBJECT: GRB 230414B: 3.6m DOT Optical observations, slow decay at early epochs DATE: 23/04/16 19:21:38 GMT FROM: Rahul Gupta at ARIES, India Amit K. Ror, Rahul Gupta, S. B. Pandey, A. Aryan, K. Misra (ARIES), A. J. Castro-Tirado (IAA-CSIC), D. Bhattacharya (Ashoka University/IUCAA), and V. Bhalerao (IITB) report on behalf of a larger collaboration: We observed the field of GRB 230414B (D'Ai et al. GCN 33612; and Evans et al. GCN 33613) using the TANSPEC mounted at the axial port of the 3.6m Devasthal Optical Telescope (DOT) of ARIES Nainital. We have taken multiple frames with an exposure time of 300 sec each in r, and i filters on 2023-04-14 and successive nights. We clearly detect the optical afterglow (Pankov et al. GCN 33615; Lu et al. GCN 33616; Raman et al. GCN 33618; Ghosh et al. GCN 33620; Moskvitin et al. GCN 33622; Malesani et al. GCN 33623; Zhu et al. GCN 33625; Belkin et al. GCN 33628; Fernandez et al. GCN 33629; Quadri et al. GCN 33630; and Leonini et al. GCN 33634) in each individual image taken on 2023-04-14. We report the preliminary brightness of the afterglow to be i = 19.95 +/- 0.16 mag ~ 43 minutes after the BAT trigger. By combining our i-band magnitude with the observations of Raman et al. GCN 33618, we determine the preliminary flux decay index of 0.60 +/-0.08. Our observations indicate the slow flux decay behavior of the afterglow at the early epoch, as also noted by Malesani et al. GCN 33623. Late-time observations will further provide insight into jet geometry, circumburst medium, and the total energy of the burst. The magnitude quoted is not corrected for the Galactic and host extinctions in the direction of the burst. Photometric calibration is performed using the standard stars from the PanSTARRS catalog. This circular may be cited. 3.6m Devasthal Optical Telescope (DOT) is the recently commissioned facility in the Northern Himalayan region of India (long:79 41 04E, lat:29 21 40N, alt:2540m) owned and operated by the Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital ( https://www.aries.res.in). Authors of this GCN circular thankfully acknowledge consistent support from the staff members to run and maintain the 3.6m DOT.
GCN 33637 table
GRB_name GRB230414B
GCN_number 33637
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33637 SUBJECT: VIRT optical transient detection DATE: 23/04/16 23:44:45 GMT FROM: Priya Gokuldass at Florida Tech R. Querrard (UVI), K. Smith (UVI), N. Orange (OrangeWave Innovative Science, LLC), D. Morris (UVI), P. Gokuldass (Florida Tech), and K. Noonan (UVI) report: We observed the field of GRB230414B (D'Ai et al. GCN 33612; Evans et al. GCN 33613) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 04-14-2023 starting at 23:35:12 UT (T+7.4hrs). We performed a series of exposures in R filter with a total exposure of 1080 s. The weather conditions were mixed during the hours of observation with an average airmass of ~1.5. We detect the optical transient reported by others (Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618; Ghosh et al., GCN 33620; Moskvitin et al., GCN 33622; Malesani et al., GCN 33623; Zhu et al., GCN 33625, Belkin et al., GCN 33628; Agui Fernandez et al. GCN 33629; Quadri & Strabla GCN 33630; Leonini et al. GCN 33634; and Ror et al. GCN 33636). We confirm a slow decay or rebrightening as suggested in earlier reports (Malesani et al., GCN 33623 and Moskvitin et al., GCN 33622) and report the following magnitude: T_mid ||Exposure ||Filter ||Magnitude ||Airmass T+7.8 hrs   ||1080s ||R ||19.1 +/- 0.2 ||1.5 The magnitude is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. Further analysis is in progress. The VIRT is still in the commissioning phase. We acknowledge financial support from NASA MUREP MIRO award 80NSSC21M0001, NASA EPSCoR award 80NSSC22M0063, and NSF EiR award 1901296. R.Q. and N.B.O. also acknowledge financial support from South Carolina Space Grant award 80NSSC20M0054. This message can be cited.
GCN 33641 table
GRB_name GRB230414B
GCN_number 33641
Detection_method Optical
ra 181.0947°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33641 SUBJECT: GRB 230414B: Osservatorio Astronomico Nastro Verde - Sorrento: optical observations DATE: 23/04/18 16:26:54 GMT FROM: Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 I imaged the field of GRB 230414B detected by SWIFT(trigger 1164180) with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of: AAVSO - American Association of Variable Star Observers. UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili. AstroCampania Associazione The observations started at 20:28 UT of 2023/04/14 with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME I took 12 image of 180 sec each. All images are unfiltered stacked with Tycho Tracker software . Start T0+ End T0+ 20:28:53 UT 21;26:21 UT I detected a (fading) afterglow in the error box of the XRTcandidate. A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), et al. at the following position (+/- 2 arcsec): RA (J2000) = 12h 04m 22.73s DEC(J2000) = +53° 09' 15.3" The results of our photometry are: ----------------------------------------- Date UT CR-mag Middle +/- 0.05 ----------------------------------------- 2460049.354 19.760887 2460049.359 19.691675 2460049.361 19.481389 2460049.363 19.618392 2460049.365 19.760087 2460049.367 19.909645 2460049.37 19.739394 2460049.374 19.071181 2460049.388 19.378857 2460049.394 21.82892 ----------------------------------------- Magnitudes were estimated with the Gaia DR2 cat. and are not corrected for galactic dust extinction. The message may be cited.
GCN 33642 table
GRB_name GRB230414B
GCN_number 33642
Detection_method Swift-UVOT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 33642 SUBJECT: GRB 230414B: Swift/UVOT Detection DATE: 23/04/18 17:05:38 GMT FROM: Sam LaPorte at PSU GRB 230414B: Swift/UVOT Detection S. J. LaPorte (PSU) and A. D'Ai (INAF-IASFPA) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 230414B 133 s after the BAT trigger (D'Ai et al., GCN Circ. 33612). A fading source consistent with the optical position (Pankov et al. GCN Circ. 33615) is detected in the initial UVOT exposures. Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag b 543 735 38 >19.23 m2 1070 1089 19 >17.31 u 287 710 265 >20.09 v 617 1065 58 >18.53 w1 666 859 38 >18.48 w2 766 785 19 >17.72 white_FC 129 1015 481 20.92+-0.22 white 5056 5203 145 >20.64 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.017 in the direction of the burst (Schlegel et al. 1998).
GCN 33645 table
GRB_name GRB230414B
GCN_number 33645
Detection_method Swift-BAT Det
ra 181.0520°
decl 53.1790°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33645 SUBJECT: GRB 230414B Swift-BAT refined analysis DATE: 23/04/18 17:28:11 GMT FROM: Tyler Parsotan at UMBC/GSFC/CRESST II T. Parsotan (GSFC/UMBC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU) (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 230414B (trigger #1164180) (D'Ai et al., GCN 33612). The BAT ground-calculated position is RA, Dec = 181.052, 53.179 deg which is RA(J2000) = 12h 04m 12.5s Dec(J2000) = +53d 10' 44.7" with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 80%. The mask weighted light curve shows a single main fast rise exponential decay type pulse. T90 (15-350 keV) is 25.98 +- 8.86 sec (estimated error including systematics). The time-averaged spectrum from T-1.77 to T+27.14 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.60 +- 0.30. The fluence in the 15-150 keV band is 4.7 +- 1.0 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+9.31 sec in the 15-150 keV band is 0.6 +- 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/1164180/BA/
GCN 33648 table
GRB_name GRB230414B
GCN_number 33648
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33648 SUBJECT: GRB 230414B: Nickel and KAIT telescope optical observations DATE: 23/04/18 17:53:50 GMT FROM: Weikang Zheng at UC Berkeley Sophia Risin, Ivan Altunin, Colin Rushing, WeiKang Zheng and Alex Filippenko (UC Berkeley) report on behalf of the KAIT GRB team: We observed the field of GRB 230414B (D'Ai et al., GCN 33612) with the 1-m Nickel and 0.76-m KAIT telescopes located at Lick observatory, California. Observations started about 0.57 days after the burst. A total of 6 images (600s exposure each) in R band were taken with Nickel telescopes, while KAIT images were taken in clear band, with 60s exposure and coadded. We clearly detected the optical afterglow (Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618; Ghosh et al., GCN 33620; Moskvitin et al., GCN 33622; Malesani et al., GCN 33623; Zhu et al., GCN 33625; Belkin et al., GCN 33628; Fernandez et al., GCN 33629; Quadri et al., GCN 33630; Leonini et al., GCN 33634; Ror et al., GCN 33636; Querrard et al., GCN 33637; Ruocco, GCN 33641; LaPorte et al., GCN 33642) and measure the following magnitude calibrated to the Pan-STARRS1 catalog: t-t0(days) filter mag err 0.57 clear 19.6 0.1 0.64 R 19.7 0.1 0.72 clear 20.0 0.2
GCN 33660 table
GRB_name GRB230414B
GCN_number 33660
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33660 SUBJECT: GRB230414B: VIRT Optical Upper Limit DATE: 23/04/20 18:02:52 GMT FROM: Priya Gokuldass at Florida Tech N. Orange (OrangeWave Innovative Science, LLC), K. Smith (UVI), R. Querrard (UVI), H. Zimmerman (UVI), D. Morris (UVI), P. Gokuldass (Florida Tech), and K. Noonan (UVI) report: We observed the field of GRB230414B (D'Ai et al. GCN 33612; Evans et al. GCN 33613) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 04-16-2023 starting at 01:37:00 UT (T+33.4 hrs). We performed a series of exposures in R filter with a total exposure of 2900 s. The weather conditions were mixed during the hours of observation with an average airmass of ~1.3. We do not detect the source identified by others (Pankov et al., GCN 33615; Lu et al., GCN 33616; Raman et al., GCN 33618; Ghosh et al., GCN 33620; Moskvitin et al., GCN 33622; Malesani et al., GCN 33623; Zhu et al., GCN 33625; Belkin et al., GCN 33628; Fernandez et al., GCN 33629; Quadri et al., GCN 33630; Leonini et al., GCN 33634; Ror et al., GCN 33636; Querrard et al., GCN 33637; Ruocco, GCN 33641; LaPorte et al., GCN 33642; Risin et al., GCN 33648) and report the following 3-sigma upper limit: T_mid ||Exposure ||Filter ||Limit T+35.1 hrs ||2900s ||R ||>20.5 The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase. We acknowledge financial support from NASA MUREP MIRO award 80NSSC21M0001, NASA EPSCoR award 80NSSC22M0063, and NSF EiR award 1901296. R.Q. and N.B.O. also acknowledge financial support from South Carolina Space Grant award 80NSSC20M0054. This message can be cited.