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[vsnet-grb-info 42473] EP260416a: 1.5m OSN and 2.2m CAHA optical monitoring
by GCN Circulars 20 Apr '26

20 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44351 SUBJECT: EP260416a: 1.5m OSN and 2.2m CAHA optical monitoring DATE: 26/04/20 04:03:59 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct(a)iaa.es> S. Guziy, F. J. Aceituno, A. J. Castro-Tirado, M.D. Caballero-García, M. Gritsevich, I. Pérez-García, R. Sánchez-Ramírez, S.-Y. Wu (IAA-CSIC) and A. Fernández-Martin and M. M. Sánchez-Andújar (CAHA), on behalf of a larger collaboration,report: We observed EP260416a (Hu et al., GCN 44307) with both the 1.5m telescope at Observatorio de Sierra Nevada (OSN) and the 2.2m telescope at Calar Alto Observatory (CAHA), in Southern Spain. A series of 300 s BVRI exposures were obtained at the 1.5m OSN starting on Apr 17, 21:04 UT, complemented by one 100s i-band image at the 2.2m CAHA, on Apr 18, 01:04 UT., i.e. 39.6 h and 43.6 h respectively, after the initial trigger. The optical counterpart (Ducoin et al., GCN 44310; Li et al., GCN 44315; Hua et al., GCN 44318; Lee et al., GCN 44319; Zheng et al., GCN 44321; Martin-Carrillo et al., GCN 44328; Li et al., GCN 44334, He et al. GCN 44336, An et al. GCN 44339, Jelinek et al. GCN 44341) is well detected in our images. We measure B = 21.08 +/- 0.14 and R = 20.99 +/- 0.07 on Apr 17, 21:15 UT and I = 19.82 +/-0.18 on Apr 18, 01:04 UT (none corrected for Galactic extinction). The night after, a second epoch BVRI observation was conducted at the 1.5m OSN, for which measure R = 21.59 +/- 0.10 on Apr 18, 20:14 UT. Our measurement is consistent with the continued fading of the afterglow. Further optical monitoring is being carried out. View this GCN Circular online at https://gcn.nasa.gov/circulars/44351. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42472] The EP-WXT trigger 01709260303 is likely a flaring star
by GCN Circulars 20 Apr '26

20 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44350 SUBJECT: The EP-WXT trigger 01709260303 is likely a flaring star DATE: 26/04/20 02:32:00 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Y.-H. I. Yin (HKU), Z.-C. Zou (NJU), H.Q. Cheng and H. Sun (NAO, CAS) on behalf of the Einstein Probe (EP) team: The EP-WXT trigger 01709260303 at the time of 2026-04-19T07:22:35, is likely a stellar flare associated with Gaia DR3 4524306802880186496. The estimated flux of the flare is around 8e-11 erg/s/cm^2 in 0.5-4.0 keV, corresponding to an X-ray luminosity of around 2.1e31 erg/s. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/44350. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42471] GRB 260417A: SVOM/GRM observation
by GCN Circulars 19 Apr '26

19 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44349 SUBJECT: GRB 260417A: SVOM/GRM observation DATE: 26/04/19 16:33:14 GMT FROM: zhangjinpeng(a)ihep.ac.cn SVOM/GRM team: Jin-Peng Zhang, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Sebastien Guillot (IRAP) Report on behalf of the SVOM team: SVOM/GRM detected GRB 260417A at 2026-04-17T00:10:11.500 (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN #44317), AstroSat CZTI (S. Salunke et al., GCN #44330) and possibly by EP (K. R. Ni et al., GCN #44337). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst mainly consists of a pulse with a T90 of 38 +15/-10 s in the 15-5000 keV band. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb260417A.png In addition, the position of this burst, according to Fermi/GBM localization (RA = 252.0, Dec = -19.8, error(stat) = 3.4, Fermi GBM Team, GCN #44317), is located at about 90.3 degrees from the SVOM optical axis, which is outside the ECLAIRs field of view. With this localization, the time-averaged spectrum from T0-20 to T0+20 s is fitted by a power law function. The power law index is -1.77 +0.09/-0.09. The event fluence (10-1000 keV) in this time interval is (9.1 +1.0/-1.1)E-06 erg/cm^2. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM/GRM point of contact for this burst is: Jin-Peng Zhang (IHEP) (zhangjinpeng(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/44349. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42470] EP260321A/AT2026gzf: Optical observation from 1.3m DFOT
by GCN Circulars 19 Apr '26

19 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44348 SUBJECT: EP260321A/AT2026gzf: Optical observation from 1.3m DFOT DATE: 26/04/19 09:06:27 GMT FROM: ANSHIKA GUPTA at ARIES <anshika05180(a)gmail.com> Anshika Gupta, Pankaj Pawar, Divyanshu Janghel, Dhruv Jain, Debalina Kar, and Kuntal Misra (ARIES) report: We observed the field of EP260321A/AT2026gzf detected by EP-WXT (Huang, GCN 44068) with the 1.3m Devasthal Fast Optical Telescope (DFOT), located at the Devasthal Observatory of the Aryabhatta Research Institute of Observational Sciences (ARIES), India. Observations began on 2026-04-16 at 14:22:58 UT, i.e., ~26.07 days after the EP-WXT trigger. We have taken multiple frames with an exposure time of 300s in the R filter. We stacked the images after the alignment. We detect an optical afterglow in our stacked image. We obtain the following preliminary magnitude in the stacked image: Date Start_UT T_start-T0 (days) Filter Exp time (s) Magnitude ================================================================= 2026-04-16 14:22:58 ~26.07 R 300s*4 17.14 +- 0.01 The optical detection of the burst is consistent with Lipunov et al., GCN 44069; Lee et al., GCN 44070; Aryan et al., GCN 44081; Tanvir et al., GCN 44082; Moran et al., GCN 44083; Ahumada et al., GCN 44084; Liu et al., GCN 44087; Sankar et al. GCN 44089; de Ugarte Postigo et al., GCN 44091; Xu et al., GCN 44092; Pankov et al. GCN 44103; Corcoran et al., GCN 44105; Rastinejad et al., GCN 44107; Gao et al., GCN 44110; He et al., GCN 44117; Zhang et al., GCN 44171; Li et al., GCN 44284; Volnova et al., GCN 44295. The magnitude is not corrected for the Galactic extinction in the direction of the burst. Photometric calibration is performed using the standard stars from the USNO-B1.0 catalog. View this GCN Circular online at https://gcn.nasa.gov/circulars/44348. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42469] GRB 260419B: Fermi GBM Final Real-time Localization
by GCN Circulars 19 Apr '26

19 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44347 SUBJECT: GRB 260419B: Fermi GBM Final Real-time Localization DATE: 26/04/19 08:00:23 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 07:49:50 UT on 19 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260419B (trigger 798277795.43596 / 260419326). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 137.1, Dec = -33.8 (J2000 degrees, equivalent to J2000 09h 08m, -33d 47'), with a statistical uncertainty of 9.6 degrees. The angle from the Fermi LAT boresight is 62.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419326/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419326/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419326/… View this GCN Circular online at https://gcn.nasa.gov/circulars/44347. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42468] GRB 260419A: Fermi GBM Final Real-time Localization
by GCN Circulars 19 Apr '26

19 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44346 SUBJECT: GRB 260419A: Fermi GBM Final Real-time Localization DATE: 26/04/19 07:20:17 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 07:09:40 UT on 19 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260419A (trigger 798275385.308626 / 260419298). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 317.4, Dec = -34.4 (J2000 degrees, equivalent to J2000 21h 09m, -34d 23'), with a statistical uncertainty of 2.3 degrees. The angle from the Fermi LAT boresight is 77.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419298/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419298/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419298/… View this GCN Circular online at https://gcn.nasa.gov/circulars/44346. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42467] Fermi trigger No 798275385: Global MASTER-Net observations report
by GCN Circulars 19 Apr '26

19 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44345 SUBJECT: Fermi trigger No 798275385: Global MASTER-Net observations report DATE: 26/04/19 07:16:07 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB260419.30 (trigger No 798275385,20h 50m 14.40s , -47d 41m 24.0s, R=4.3) errorbox 42 sec after notice time and 75 sec after trigger time at 2026-04-19 07:10:56 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 52 deg. The sun altitude is -48.6 deg. The galactic latitude b = -40 deg., longitude l = 352 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3259527 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 86 | 2026-04-19 07:10:56 | MASTER-OAFA | (20h 49m 30.10s , -47d 58m 25.7s) | C | 20 | 19.4 | 112 | 2026-04-19 07:11:22 | MASTER-OAFA | (20h 49m 30.11s , -47d 58m 24.7s) | C | 20 | 19.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/44345. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42466] EP260417a: GROWTH-India Telescope optical upper limit
by GCN Circulars 18 Apr '26

18 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44344 SUBJECT: EP260417a: GROWTH-India Telescope optical upper limit DATE: 26/04/18 23:25:30 GMT FROM: V. Swain at IIT Bombay <vishwajeet.s(a)iitb.ac.in> A. Khade (IITB), A. Kumar (IITB), V. Vijaykumar (IITB), T. Mohan (IITB), V. Swain (IITB), D. Eappachen (IIA), S. Patil (IITB), A.P. Saikia (IITB), V. Bhalerao (IITB), G.C. Anupama (IIA), S. Barway (IIA) and R. Norbu (IAO) report on behalf of the GIT team: We observed the field of EP260417a detected by Einstein Probe (Wang et al., GCN 44325), with 0.7m GROWTH-India Telescope (GIT). We started the observation at 2026-04-18 21:01:23 (UTC), i.e., 1.86 days after the trigger, and obtained multiple exposures in the r' filter. No optical counterpart is detected at the position reported by He et al. (GCN 44326) in our stacked image. The photometric upper limit is as follows: | MJD (mid) | Filter | tmid-t0 (hours) | Exposure Time (sec) | Upper limit (AB) | | ------------ | ------ | -------------- | ------------------- | ---------------- | | 61148.885 | r' | 44.85 | 4x360 | 20.64 | The measurement is calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction. Our upper limit is consistent with the reported optical measurements by He et al. (GCN 44326) and Lipunov et al. (GCN 44338). 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/. View this GCN Circular online at https://gcn.nasa.gov/circulars/44344. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42465] Fermi GRB 260417B: Global MASTER-Net observations report
by GCN Circulars 18 Apr '26

18 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44343 SUBJECT: Fermi GRB 260417B: Global MASTER-Net observations report DATE: 26/04/18 23:15:27 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 260417B ( Fermi GBM team, GCN 44331) errorbox 66043 sec after notice time and 66079 sec after trigger time at 2026-04-18 10:05:14 UT, with upper limit up to 18.4 mag. Observations started at twilight. The observations began at zenith distance = 31 deg. The sun altitude is -11.6 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 260417B errorbox 1 days 23747 sec after notice time and 1 days 23783 sec after trigger time at 2026-04-18 22:20:18 UT, with upper limit up to 18.7 mag. The observations began at zenith distance = 48 deg. The sun altitude is -68.6 deg. The galactic latitude b = 1 deg., longitude l = 1 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3256668 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 23203 | 2026-04-17 22:10:08 | MASTER- | (17h 10m 25.00s , -22d 17m 31.5s) | C | 60 | 14.7 | 23280 | 2026-04-17 22:11:25 | MASTER- | (17h 25m 38.80s , -19d 39m 45.5s) | C | 60 | 13.2 | 23367 | 2026-04-17 22:12:52 | MASTER- | (17h 28m 29.57s , -18d 22m 14.8s) | C | 60 | 14.2 | 23445 | 2026-04-17 22:14:10 | MASTER- | (17h 09m 03.19s , -23d 33m 52.4s) | C | 60 | 14.9 | 24134 | 2026-04-17 22:25:39 | MASTER- | (17h 08m 12.30s , -24d 53m 35.2s) | C | 60 | 16.3 | 24217 | 2026-04-17 22:27:02 | MASTER- | (16h 56m 13.19s , -26d 09m 52.5s) | C | 60 | 15.3 | 66109 | 2026-04-18 10:05:14 | MASTER-OAFA | (17h 05m 41.45s , -21d 18m 08.8s) | C | 60 | 18.4 | 66184 | 2026-04-18 10:06:29 | MASTER-OAFA | (17h 14m 24.55s , -21d 19m 32.1s) | C | 60 | 18.0 | 66259 | 2026-04-18 10:07:44 | MASTER-OAFA | (17h 05m 42.90s , -21d 20m 07.9s) | C | 60 | 18.3 | 66335 | 2026-04-18 10:09:00 | MASTER-OAFA | (17h 14m 23.15s , -21d 20m 27.1s) | C | 60 | 18.0 | 66410 | 2026-04-18 10:10:14 | MASTER-OAFA | (17h 05m 44.83s , -21d 18m 07.3s) | C | 60 | 18.1 | 66561 | 2026-04-18 10:12:46 | MASTER-OAFA | (16h 54m 04.36s , -25d 06m 35.0s) | C | 60 | 17.9 | 110213 | 2026-04-18 22:20:18 | MASTER-SAAO | (17h 03m 25.97s , -21d 49m 48.4s) | C | 60 | 18.6 | 110399 | 2026-04-18 22:23:24 | MASTER-SAAO | (17h 17m 53.69s , -21d 35m 09.4s) | C | 60 | 18.1 | 110399 | 2026-04-18 22:23:24 | MASTER-SAAO | (17h 19m 53.70s , -21d 51m 16.9s) | C | 60 | 18.3 | 110492 | 2026-04-18 22:24:57 | MASTER-SAAO | (16h 59m 36.82s , -27d 32m 32.8s) | C | 60 | 17.5 | 110492 | 2026-04-18 22:24:57 | MASTER-SAAO | (16h 57m 30.65s , -27d 16m 26.2s) | C | 60 | 17.7 | 110586 | 2026-04-18 22:26:30 | MASTER-SAAO | (16h 59m 00.63s , -23d 27m 32.8s) | C | 60 | 18.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp. http : // www.pereplet.ru/lipunov/625.html View this GCN Circular online at https://gcn.nasa.gov/circulars/44343. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 42464] EP260417b: GROWTH-India Telescope optical upper limit
by GCN Circulars 18 Apr '26

18 Apr '26

TITLE: GCN CIRCULAR NUMBER: 44342 SUBJECT: EP260417b: GROWTH-India Telescope optical upper limit DATE: 26/04/18 22:00:13 GMT FROM: V. Swain at IIT Bombay <vishwajeet.s(a)iitb.ac.in> V. Vijaykumar (IITB), T. Mohan (IITB), V. Swain (IITB), D. Eappachen (IIA), S. Patil (IITB), A.P. Saikia (IITB), V. Bhalerao (IITB), G.C. Anupama (IIA), S. Barway (IIA) and R. Norbu (IAO) report on behalf of the GIT team: We observed the field of EP260417b detected by Einstein Probe (Ni et al., GCN 44323), with 0.7m GROWTH-India Telescope (GIT). We started the observation at 2026-04-18 19:04:51 (UTC), i.e., 1.74 days after the trigger, and obtained a single exposure in the r' filter. We did not detect any transient in our image within the uncertainty region of source position reported by EP. The photometric upper limit is as follows: | MJD (mid) | Filter | tmid-t0 (hours) | Exposure Time (sec) | Upper limit (AB) | | ------------ | ------ | -------------- | ------------------- | ---------------- | | 61149.797 | r' | 41.78 | 420 | 19.3 | The measurement is 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/. View this GCN Circular online at https://gcn.nasa.gov/circulars/44342. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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