https://gcn.nasa.gov/circulars/31597
GCN - Circulars - 31597 - ZTF22aaajecp: GIT optical follow-up observations
gcn circularsfollow upgitopticalobservations
https://gcn.nasa.gov/circulars/44120?page=5&limit=100&view=index
GCN - Circulars - 44120 - EP260324a: ZTF discovery of the optical counterpart ZTF26aapviim/AT2026hir
gcn circularsof theztfdiscoveryoptical
https://test.gcn.nasa.gov/circulars/29118
GCN - Circulars - 29118 - GRB 201221D: Nanshan/NEXT early optical upper limit
gcn circularsupper limitgrbnanshannext
https://gcn.nasa.gov/circulars/14697?query=130427A
GCN - Circulars - 14697 - GRB 130521A: Skynet/PROMPT observations
gcn circularsgrbskynetpromptobservations
https://test.gcn.nasa.gov/circulars/6836
GCN - Circulars - 6836 - GRB 070714B: host galaxy spectroscopic redshift
gcn circularshost galaxyspectroscopic redshiftgrb
https://gcn.nasa.gov/circulars/44939?page=4&limit=100&query=141029A+-+FIELD+1&view=index
GCN - Circulars - 44939 - GRB 260614B: SVOM/VT optical candidate from VHF data
gcn circularsgrbsvomopticalcandidate
https://gcn.nasa.gov/circulars/39766?query=250316A
GCN - Circulars - 39766 - Fermi trigger No 763933627: Global MASTER-Net observations report
gcn circularsfermitriggerglobalmaster
https://test.gcn.nasa.gov/circulars/2562
GCN - Circulars - 2562 - GRB 040403: optical observations
gcn circularsgrbopticalobservations
https://gcn.nasa.gov/circulars/137?page=444&limit=100&query=081211B+%3F&view=index
GCN - Circulars - 137 - GRB980703: Spectrum of the proposed optical counterpart
gcn circularsof thespectrumproposedoptical
https://gcn.nasa.gov/circulars/30401
GCN - Circulars - 30401 - GRB 210704A: OAJ T80 multi-color detections
gcn circularsgrboajmulticolor
https://gcn.nasa.gov/circulars/9346?page=362
GCN - Circulars - 9346 - GRB 090502: Fermi GBM detection
gcn circularsgrbfermigbmdetection
https://gcn.nasa.gov/circulars/11939?query=110420A
GCN - Circulars - 11939 - GRB 110414A: GROND upper limits
gcn circularsupper limitsgrbgrond
https://gcn.nasa.gov/circulars/new/43124
GCN - Circulars - Edit - 43124
gcn circularsedit
https://gcn.nasa.gov/circulars/27361
GCN - Circulars - 27361 - LIGO/Virgo S200311bg: not observable by AGILE at the event time
gcn circularsat theevent timeligovirgo
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https://test.gcn.nasa.gov/circulars/21219
GCN - Circulars - 21219 - GRB 170607A: MASTER-Tavrida early OT observations
gcn circularsgrbmastertavridaearly
https://gcn.nasa.gov/circulars/events/ep260409a?query=SWIFT+J1818.0-1607
GCN - Circulars - Events - EP260409a
gcn circularsevents
https://gcn.nasa.gov/circulars/events/grb-240825a?query=250215A
GCN - Circulars - Events - GRB 240825A
gcn circularseventsgrb
https://test.gcn.nasa.gov/circulars/29976
GCN - Circulars - 29976 - IceCube-210510A - IceCube observation of a high-energy neutrino candidate...
gcn circularshigh energyicecubeobservationneutrino
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https://gcn.nasa.gov/circulars/43631?limit=100&query=SWIFT+J1818.0-1607&view=index
GCN - Circulars - 43631 - Fermi GRB 260207B: Global MASTER-Net observations report
gcn circularsfermigrbglobalmaster
https://gcn.nasa.gov/circulars/43182?page=2&limit=100&query=SWIFT+J1818.0-1607&view=index
GCN - Circulars - 43182 - v2 - EP251220a: NOT optical observations
gcn circularsopticalobservations
https://gcn.nasa.gov/circulars/new/42861
GCN - Circulars - Edit - 42861
gcn circularsedit
https://gcn.nasa.gov/circulars/40076
GCN - Circulars - 40076 - EP250404a: Osservatorio Astronomico "Nastro Verde" optical observations:...
gcn circularsosservatorioastronomiconastroverde
https://gcn.nasa.gov/circulars/19547
GCN - Circulars - 19547 - GRB 160622A: Swift detection of a possible short GRB or a new SGR
gcn circularsgrbswiftdetectionpossible
https://test.gcn.nasa.gov/circulars/21108
GCN - Circulars - 21108 - GRB 170519A: optical observations
gcn circularsgrbopticalobservations
https://gcn.nasa.gov/circulars/44872?page=4&limit=100&query=141029A+-+FIELD+1&view=index
GCN - Circulars - 44872 - GRB 260604C: SVOM/C-GFT upper limit
gcn circularsupper limitgrbsvomgft
https://gcn.nasa.gov/circulars/38290
GCN - Circulars - 38290 - EP241119a: Optical upper limits with Kinder observations
gcn circularsupper limitsopticalkinderobservations
https://gcn.nasa.gov/circulars/new/13959
GCN - Circulars - Edit - 13959
gcn circularsedit
https://gcn.nasa.gov/circulars/30167
GCN - Circulars - 30167 - Swift GRB 210610A: Global MASTER-Net observations report
gcn circularsswift grbglobalmasterobservations
https://test.gcn.nasa.gov/circulars/30757
GCN - Circulars - 30757 - GRB 210820A: TSHAO optical upper limit
gcn circularsupper limitgrbtshaooptical
https://gcn.nasa.gov/circulars/new/2841
GCN - Circulars - Edit - 2841
gcn circularsedit
https://gcn.nasa.gov/circulars/44506
GCN - Circulars - 44506 - GRB 260509A: LCO optical counterpart detection
gcn circularsgrblcoopticalcounterpart
https://gcn.nasa.gov/circulars/10205
GCN - Circulars - 10205 - GRB 091127: Further NOT optical observations
gcn circularsgrbopticalobservations
https://test.gcn.nasa.gov/circulars/598
GCN - Circulars - 598 - GRB000301c - R photometry and nearby faint source confirmation
gcn circularsphotometrynearbyfaintsource
https://gcn.nasa.gov/circulars/events/grb-170330a?query=170330A
GCN - Circulars - Events - GRB 170330A
gcn circularseventsgrb
https://gcn.nasa.gov/circulars/28296
GCN - Circulars - 28296 - Fermi GRB 200824A: Global MASTER-Net observations report
gcn circularsfermigrbglobalmaster
https://gcn.nasa.gov/circulars/38993
GCN - Circulars - 38993 - LIGO/Virgo/KAGRA S250105bn: 1 counterpart neutrino candidate event from...
gcn circularsligovirgokagracounterpart
https://gcn.nasa.gov/circulars/2080?page=421&limit=100&view=index
GCN - Circulars - 2080 - GRB030329: optical observations at Tokyo Tech
gcn circularstokyo techopticalobservations
https://gcn.nasa.gov/circulars/43767?query=SWIFT+J1818.0-1607
GCN - Circulars - 43767 - GRB 260213A: GECAM-B observation of a short burst
gcn circularsgrbgecamobservationshort
https://gcn.nasa.gov/circulars/new/17822
GCN - Circulars - Edit - 17822
gcn circularsedit
https://test.gcn.nasa.gov/circulars/1312
GCN - Circulars - 1312 - v3 - SN 2002ap - peak brightness date (SN/GRB?)
gcn circularspeakbrightnessdategrb
https://gcn.nasa.gov/circulars/40253?page=4&limit=100&query=141029A+-+FIELD+1&view=index
GCN - Circulars - 40253 - IceCube-250426A - IceCube observation of a high-energy neutrino candidate...
gcn circularshigh energyicecubeobservationneutrino
https://gcn.nasa.gov/circulars/37636
GCN - Circulars - 37636 - Fermi GRB 240930A: Global MASTER-Net observations report
gcn circularsfermigrbglobalmaster
https://gcn.nasa.gov/circulars/new/9321
GCN - Circulars - Edit - 9321
gcn circularsedit
https://test.gcn.nasa.gov/circulars/4159
GCN - Circulars - 4159 - GRB051021a: optical observations
gcn circularsopticalobservations
https://test.gcn.nasa.gov/circulars/12443
GCN - Circulars - 12443 - GRB 111016A: MITSuME Akeno Optical upper limits
gcn circularsupper limitsgrbakenooptical
https://gcn.nasa.gov/circulars/33722
GCN - Circulars - 33722 - GRB 230427A: Swift-BAT refined analysis
gcn circularsgrbswiftbatrefined
https://gcn.nasa.gov/circulars/8441?query=080303
GCN - Circulars - 8441 - GRB 081029: REM observations
gcn circularsgrbremobservations
https://test.gcn.nasa.gov/circulars/7985
GCN - Circulars - 7985 - Trigger 317205: Swift detection of an outburst from XTE J1701-407
gcn circularsof antriggerswiftdetection
https://gcn.nasa.gov/circulars/events/grb-210821a
GCN - Circulars - Events - GRB 210821A
gcn circularseventsgrb
https://gcn.nasa.gov/circulars/12589?query=111204A
GCN - Circulars - 12589 - GRB 111123A: GMG optical observation
gcn circularsgrbgmgopticalobservation
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https://gcn.nasa.gov/circulars/30570
GCN - Circulars - 30570 - GRB 210731A: MeerLICHT optical afterglow detection
gcn circularsgrbopticalafterglowdetection
https://gcn.nasa.gov/circulars/22435
GCN - Circulars - 22435 - GRB 180222A: Enhanced Swift-XRT position
gcn circularsgrbenhancedswiftxrt
https://gcn.nasa.gov/circulars/new/33185
GCN - Circulars - Edit - 33185
gcn circularsedit
https://gcn.nasa.gov/circulars/10654?page=348&limit=100&view=index
GCN - Circulars - 10654 - Trigger 420256: Swift detection of a possible GRB
gcn circularstriggerswiftdetectionpossible
https://gcn.nasa.gov/circulars/4822
GCN - Circulars - 4822 - GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
gcn circularsgrbswiftbatfluence
https://gcn.nasa.gov/circulars/43533?page=2&limit=100&view=index
GCN - Circulars - 43533 - GRB 260127B: Fermi GBM Final Real-time Localization
gcn circularsreal timegrbfermigbm
https://gcn.nasa.gov/circulars/40214
GCN - Circulars - 40214 - GRB 250421A: AstroSat CZTI detection
gcn circularsgrbastrosatdetection
https://test.gcn.nasa.gov/circulars/1713
GCN - Circulars - 1713 - IPN triangulation of GRB021115 (annulus)
gcn circularsipntriangulationannulus
https://gcn.nasa.gov/circulars/new/4076
GCN - Circulars - Edit - 4076
gcn circularsedit
https://gcn.nasa.gov/circulars/40461
GCN - Circulars - 40461 - GRB 250424A: COLIBRÍ detection of the associated supernova
gcn circularsof thegrbdetectionassociated
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https://test.gcn.nasa.gov/circulars/19850
GCN - Circulars - 19850 - IPN Triangulation of GRB 160820A (short/hard)
gcn circularsipntriangulationgrbshort
https://gcn.nasa.gov/circulars/17477
GCN - Circulars - 17477 - GRB 150219A: Swift ToO observations
gcn circularsgrbswiftobservations
https://gcn.nasa.gov/circulars/23264
GCN - Circulars - 23264 - GRB 180924A: Swift-BAT refined analysis
gcn circularsgrbswiftbatrefined
https://test.gcn.nasa.gov/circulars/13585
GCN - Circulars - 13585 - GRB 120804A: Swift-BAT Spectral lag analysis
gcn circularsgrbswiftbatspectral
https://gcn.nasa.gov/circulars/16504
GCN - Circulars - 16504 - GRB 140703A: BOOTES-2 and OSN optical observations
gcn circularsgrbbootesosnoptical
https://test.gcn.nasa.gov/circulars/19215
GCN - Circulars - 19215 - GRB 160321A: Swift-XRT refined Analysis
gcn circularsgrbswiftxrtrefined
https://test.gcn.nasa.gov/circulars/2009
GCN - Circulars - 2009 - GRB 030329: Upper limit from 5.6 hours before trigger
gcn circularsupper limitgrbhourstrigger
https://gcn.nasa.gov/circulars/43212?query=251222A
GCN - Circulars - 43212 - GRB 251222A / EP251222b: LCO detection of the optical counterpart
gcn circularsof thegrblcodetection
https://gcn.nasa.gov/circulars/16137
GCN - Circulars - 16137 - GRB 140419A: KAIT Refined Analysis
gcn circularsgrbkaitrefinedanalysis
https://gcn.nasa.gov/circulars/new/12364
GCN - Circulars - Edit - 12364
gcn circularsedit
https://test.gcn.nasa.gov/circulars/27263
GCN - Circulars - 27263 - GRB 200228B: KAIT Optical Upper Limit
gcn circularsupper limitgrbkaitoptical
https://gcn.nasa.gov/circulars/17012
GCN - Circulars - 17012 - GRB 141031B: MITSuME Ishigakijima upper limits
gcn circularsupper limitsgrbishigakijima
https://gcn.nasa.gov/circulars/423?page=406&limit=100&view=index
GCN - Circulars - 423 - GRB 991014, Optical Observations
gcn circularsgrbopticalobservations
https://gcn.nasa.gov/circulars/30364
GCN - Circulars - 30364 - GRB 210702A: iTelescope optical afterglow observations
gcn circularsgrbopticalafterglowobservations
https://test.gcn.nasa.gov/circulars/30603
GCN - Circulars - 30603 - GRB 210807A: Enhanced Swift-XRT position
gcn circularsgrbenhancedswiftxrt
https://gcn.nasa.gov/circulars/38837?query=250106A
GCN - Circulars - 38837 - GRB 250101A: J band upper limit by SYSU 80cm telescope
gcn circularsj bandupper limitgrbsysu
https://test.gcn.nasa.gov/circulars/20439
GCN - Circulars - 20439 - GRB 170112A: MASTER-OAFA (Argentina) early optical observations
gcn circularsgrbmasteroafaargentina
https://gcn.nasa.gov/circulars/184?page=453&limit=100&view=index
GCN - Circulars - 184 - GRB981226 BeppoSAX follow up
gcn circularsfollow upbepposax
https://gcn.nasa.gov/circulars/39611
GCN - Circulars - 39611 - GRB 250306A: AstroSat CZTI detection
gcn circularsgrbastrosatdetection
https://gcn.nasa.gov/circulars/45072?page=3&limit=100&query=150428C+-+FIELD+1&view=index
GCN - Circulars - 45072 - GRB 260704A: SVOM detection of a possible GRB
gcn circularsgrbsvomdetectionpossible
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https://gcn.nasa.gov/circulars/22771
GCN - Circulars - 22771 - GRB 180613A: Prompt enhanced Swift-XRT position
gcn circularsgrbpromptenhancedswift
https://gcn.nasa.gov/circulars/10377?query=100206A
GCN - Circulars - 10377 - GRB 100206A: Pre-explosion imaging and host candidate
gcn circularsgrbpreexplosionimaging
https://gcn.nasa.gov/circulars/6599?page=373&limit=100&view=index
GCN - Circulars - 6599 - Konus-Wind observation of GRB 070626
gcn circularskonuswindobservationgrb
https://gcn.nasa.gov/circulars/new/42286
GCN - Circulars - Edit - 42286
gcn circularsedit
https://test.gcn.nasa.gov/circulars/87
GCN - Circulars - 87 - GRB 980519 Optical Observations
gcn circularsgrbopticalobservations
https://gcn.nasa.gov/circulars/33486
GCN - Circulars - 33486 - Fermi trigger No 700976129: Global MASTER-Net observations report
gcn circularsfermitriggerglobalmaster
https://gcn.nasa.gov/circulars/41791?page=2&limit=100&view=index
GCN - Circulars - 41791 - Fermi GRB 250910B: Global MASTER-Net observations report
gcn circularsfermigrbglobalmaster
https://gcn.nasa.gov/circulars/44414
GCN - Circulars - 44414 - Fermi-LAT Gamma-ray Observations of IceCube-260425A
gcn circularsfermi latgamma rayobservationsicecube
https://test.gcn.nasa.gov/circulars/7312
GCN - Circulars - 7312 - Swift-XRT and UVOT observations of the IPN burst GRB 080211
gcn circularsof theswiftxrtobservations
https://gcn.nasa.gov/circulars/new/29
GCN - Circulars - Edit - 29
gcn circularsedit
https://gcn.nasa.gov/circulars/new/4939
GCN - Circulars - Edit - 4939
gcn circularsedit
https://gcn.nasa.gov/circulars/new/33099
GCN - Circulars - Edit - 33099
gcn circularsedit
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https://gcn.nasa.gov/circulars/23828
GCN - Circulars - 23828 - GRB 190131A: Insight-HXMT/HE detection
gcn circularsgrbinsighthxmtdetection
https://gcn.nasa.gov/circulars/45068?page=3&limit=100&query=150428C+-+FIELD+1&view=index
GCN - Circulars - 45068 - Fermi trigger No 804738310: Global MASTER-Net observations report
gcn circularsfermitriggerglobalmaster
https://test.gcn.nasa.gov/circulars/27210
GCN - Circulars - 27210 - IPN triangulation of GRB 200221A (short)
gcn circularsipntriangulationgrbshort
https://gcn.nasa.gov/circulars/17373
GCN - Circulars - 17373 - Konus-Wind observation of GRB 150201A
gcn circularskonuswindobservationgrb
https://test.gcn.nasa.gov/circulars/30867
GCN - Circulars - 30867 - Fermi-LAT Gamma-ray Observations of IceCube-210922A
gcn circularsfermi latgamma rayobservationsicecube
https://test.gcn.nasa.gov/circulars/4287
GCN - Circulars - 4287 - GRB051117A : XRT refined analysis
gcn circularsxrtrefinedanalysis
https://test.gcn.nasa.gov/circulars/14803
GCN - Circulars - 14803 - Konus-Wind observation of GRB 130606B
gcn circularskonuswindobservationgrb
https://gcn.nasa.gov/circulars/11551
GCN - Circulars - 11551 - GRB 110107A: Swift/UVOT upper limits
gcn circularsupper limitsgrbswift