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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

23690 results found.

  1. GRB 240916A: GOTO identification of two new optical sources within the GBM localisation region
  2. EP EP240913a: Global MASTER-Net observations report
  3. LIGO/Virgo/KAGRA S240915b: Coverage and upper limits from MAXI/GSC observations
  4. LIGO/Virgo/KAGRA S240915b: Identification of a GW compact binary merger candidate
  5. EP240913a/GRB 240913C: KAIT optical upper limit
  6. GRB 240913C: Fermi GBM detection
  7. GRB 240910A: SVOM/VT optical observations
  8. EP240913a: NOT optical upper limits
  9. EP240913a: ESO-NTT optical observations
  10. GRB 240914A: ESO-NTT optical observations
  11. GRB 240905E: further NOT optical observations
  12. EP240913a: A GRB Event
  13. EP240913a: EP-WXT detection of a fast X-ray transient
  14. GRB 240911A: LCO optical observations
  15. GRB 240912A: Swift/UVOT Detection
  16. GRB 240911A: GOTO optical limits on Swift/XRT candidates
  17. Fermi trigger No 747920561: Global MASTER-Net observations report
  18. GRB 240911A: Swift-XRT observations
  19. Fermi GRB 240913A: Global MASTER-Net observations report
  20. GRB 240912A: J-band observations with WINTER
  21. GRB 240912A: Swift-XRT refined Analysis
  22. Swift GRB 240912A: Global MASTER-Net observations report
  23. GRB 240912A: NOT optical spectroscopy
  24. GRB 240912A: Redshift from OSIRIS+/GTC
  25. GRB 240910A: Redshift from OSIRIS+/GTC
  26. GRB 240912A: Swift detection of a burst with an optical counterpart
  27. GRB 240910A: Fermi GBM Observation
  28. GRB 240910A: Swift-XRT detection of GOTO24fvl/AT2024vfp
  29. GRB 240910A: GOTO candidate optical counterpart
  30. EP240908a: Optical afterglow confirmation
  31. IPN triangulation of GRB 240905B (short)
  32. GRB 240905E: SVOM/VT optical observations
  33. LIGO/Virgo/KAGRA S240910ci: NED Galaxies in the Localization Volume
  34. GRB 240910A: GRBAlpha detection
  35. LIGO/Virgo/KAGRA S240910ci: Coverage and upper limits from MAXI/GSC observations
  36. LIGO/Virgo/KAGRA S240910ci: Identification of a GW compact binary merger candidate
  37. EP240908a: Mondy and AbAO follow-up observations
  38. Fermi GRB 240910A: Global MASTER-Net observations report
  39. EP240908a: optical afterglow candidate
  40. EP EP240908a: Global MASTER-Net observations report
  41. Fermi trigger No 747553301: Global MASTER-Net observations report
  42. EP240908a: TRT optical upper limit
  43. GRB 240905B: GOTO optical upper limits
  44. EP240908a: EP detection of a fast X-ray transient
  45. Fermi GRB 240908A: Global MASTER-Net observations report
  46. LIGO/Virgo/KAGRA S240908bs: Identification of a GW compact binary merger candidate
  47. LIGO/Virgo/KAGRA S240907cg: Identification of a GW compact binary merger candidate
  48. GRB 240905B: Swift-XRT observations
  49. GRB 240905E: NUTTelA-TAO / BSTI Optical Limits
  50. GRB 240905E: J-band observations with WINTER
  51. GRB 240905E: OHP/MISTRAL T193 optical upper limit
  52. Fermi GRB 240905D: Global MASTER-Net observations report
  53. Fermi GRB 240905A: Global MASTER-Net observations report
  54. GRB 240905E: NOT optical upper limits
  55. GRB 240905E: REM optical/NIR upper limits
  56. GRB 240902B: AstroSat CZTI detection of a long burst
  57. GRB 240905E: Swift-XRT refined Analysis
  58. GRB 240825A: Montarrenti Observatory optical follow-up observations
  59. Swift GRB 240905E: Global MASTER-Net observations report
  60. GRB 240905E: Swift detection of a burst
  61. Fermi GRB 240905B: Global MASTER-Net observations report
  62. Swift GRB 240904A: Global MASTER-Net observations report
  63. Fermi trigger No 747163821: Global MASTER-Net observations report
  64. GRB 240904A: Swift detection of a burst
  65. GRB 240828A: GECAM detection
  66. GRB 240825A: MeerLICHT afterglow detection
  67. Fermi trigger No 746923430: Global MASTER-Net observations report
  68. GRB 240828A: SAO RAS AS-500(2) optical observations
  69. GRB 240821A: VLT spectroscopic observations
  70. Fermi trigger No 746882332: Global MASTER-Net observations report
  71. GRB 240829B: GRBAlpha detection
  72. GRB240828B: REM optical/NIR upper limits
  73. Fermi trigger No 746816563: Global MASTER-Net observations report
  74. GRB 240828B: GRANDMA Optical Upper Limit
  75. LIGO/Virgo/KAGRA S240830gn: Coverage and upper limits from MAXI/GSC observations
  76. GRB 240829A: Swift-BAT refined analysis
  77. GRB 240825A: Swift-BAT refined analysis
  78. GRB 240828B: J-band upper limit from WINTER
  79. Fermi trigger No 746684112: Global MASTER-Net observations report
  80. GRB 240828B: GMG Optical Upper Limit
  81. GRB 240828A: KAIT continued optical observations
  82. GRB 240828B: KAIT optical upper limit
  83. Fermi trigger No 746587425: Global MASTER-Net observations report
  84. GRB 240629A: First GRB Detected by BurstCube
  85. GRB 240828A: KAIT Optical Afterglow Candidate
  86. GRB 240825A: SVOM/VT optical detection
  87. GRB 240828A: Swift-XRT afterglow detection
  88. GRB 240825A: iTelescope optical observations
  89. GRB 240829A: Swift detection of a burst
  90. Swift GRB240829.16: Global MASTER-Net observations report
  91. LAT GRB240828.62: Global MASTER-Net observations report
  92. GRB 240828A: AstroSat CZTI detection of a long burst
  93. Fermi GRB 240828A: Global MASTER-Net observations report
  94. Fermi trigger No 746438824: Global MASTER-Net observations report
  95. SVOM GRB 240821A: optical afterglow discovery
  96. GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
  97. GRB 240824A: GIT optical upper limit
  98. GRB 240825A: TNG optical photometry and spectroscopy
  99. GRB 240825A: NUTTelA-TAO / BSTI Optical Limits
  100. GRB 240825A: GMG Continued Optical Observation on the Second Night

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