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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"

32689 results found.

  1. GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit
  2. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  3. GRB 240821A : a likely short GRB detected by SVOM/ECLAIRs
  4. GRB 240819A: Swift-XRT observations
  5. GRB 240819A: JinShan optical upper limits on one Swift/XRT source
  6. EP240820a: TRT optical upper limit
  7. GRB 240819A: KAIT optical upper limit
  8. EP240816a: PRIME upper limits
  9. GRB 240819A : an X-ray transient detected by SVOM/ECLAIRs
  10. GRB 240819A: TRT optical upper limits on the Swift/XRT and EP/FXT sources
  11. GRB 240819A: Swift ToO observations
  12. GRB 240814A: SVOM/GRM observation
  13. EP240816b: Liverpool Telescope optical follow-up observations
  14. GRB 240814C: SVOM/GRM observation
  15. IceCube-240721A: AT2023qqp and AT2024pge likely unrelated
  16. GRB GRB 240809A: Osservatorio Astronomico "Nastro Verde" optical observations: detection of an optical counterpart
  17. GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
  18. EP240816b: KAIT optical upper limit
  19. GRB 240814B: GRBAlpha detection
  20. EP EP240816b: Global MASTER-Net observations report
  21. EP240816b: TRT optical upper limit
  22. Fermi GRB 240814A: Global MASTER-Net observations report
  23. Fermi GRB 240814C: Global MASTER-Net observations report
  24. Fermi GRB 240814B: Global MASTER-Net observations report
  25. GRB 240812B: SVOM/GRM observation
  26. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  27. LIGO/Virgo/KAGRA S240813d: Updated Sky localization
  28. Konus-Wind detection of GRB 240811A
  29. Konus-Wind detection of GRB 240810A
  30. LIGO/Virgo/KAGRA S240813d: Identification of a GW compact binary merger candidate
  31. LIGO/Virgo/KAGRA S240813c: Updated Sky localization
  32. LIGO/Virgo/KAGRA S240813c: Identification of a GW compact binary merger candidate
  33. GRB 240809A: Correction to the VLA source position in GCN 37158
  34. GRB 240810A: SVOM/GRM observation
  35. GRB 240809A: ATA radio non-detection
  36. GRB 240809A : RAPAS follow-up observations
  37. GRB 240809A: VLA detection
  38. GRB 240809A: ALMA detection
  39. IPN triangulation of GRB 240810A (short)
  40. GRB 240811A: Swift-BAT refined analysis
  41. GRB 240809A: Swift-BAT refined analysis
  42. EP240807a: PRIME H-band upper limits
  43. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  44. GRB 240811A: Bassano Bresciano Observatory upper limit
  45. GRB 240811A: Swift/UVOT Upper Limits
  46. EP240801a: Assy-Turgen optical observations
  47. Fermi GRB 240810A: Global MASTER-Net observations report
  48. GRB 240811A: LCOGT Optical Upper Limit
  49. GRB 240811A: Upper limits with Mephisto
  50. Konus-Wind detection of GRB 240809A
  51. Swift GRB 240811A: Global MASTER-Net observations report
  52. GRB240809A: Liverpool Telescope optical follow-up observations
  53. GRB 240809A: REM detection of the optical afterglow
  54. GRB 240809A: Bassano Bresciano Observatory optical observations
  55. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  56. GRB 240809A: Conclusive redshift from VLT
  57. Fermi-LAT gamma-ray observations of IceCube-240808A
  58. GRB 240809A: KAIT optical observations
  59. GRB 240808A: AstroSat CZTI detection
  60. GRB 240809A: GIT afterglow observations
  61. GRB 240809A: Swift/UVOT Detection
  62. GRB 240809A: Tentative redshift from NOT
  63. IPN triangulation of GRB 240807A / EP 240807a
  64. LIGO/Virgo/KAGRA S240807h: Updated Sky localization and EM Bright Classification
  65. X-ray Transient EP240807a: PRIME near-infrared upper limits
  66. Swift GRB 240809A: Global MASTER-Net observations report
  67. GRB 240809A: JinShan optical observations
  68. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  69. GRB 240809A: SVOM/GRM observation
  70. GRB 240807A: SVOM/GRM observation
  71. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  72. EP240807a: STEP/T80S optical limits
  73. GRB 240807B: AstroSat CZTI detection of a short burst
  74. EP EP240807a: Global MASTER-Net observations report
  75. EP EP240806a: Global MASTER-Net observations report
  76. GRB 240801A: GRBAlpha detection
  77. GRB 240710B: VZLUSAT-2 detection
  78. GRB 240805A: ATCA Radio Upper Limits
  79. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  80. S240807h: Identification of a GW compact binary merger candidate
  81. EP240802a/GRB240802A: KAIT optical upper limit
  82. GRB 240720B: VZLUSAT-2 detection
  83. GRB 240710A: VZLUSAT-2 detection
  84. EP240806A: Liverpool Telescope optical follow-up observations
  85. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  86. GRB 240805B: GIT optical upper limit
  87. EP240806a: KAIT optical observations
  88. GRB 240805B: Swift-BAT refined analysis
  89. GRB 240805A: Swift-BAT refined analysis
  90. EP240804a (GRB 240804B): NOT optical observations
  91. EP240806a: LCOGT optical counterpart detection
  92. Konus-Wind detection of GRB 240802A (EP240802a)
  93. Improved IPN triangulation of GRB 240802A / EP 240802a
  94. Konus-Wind detection of GRB 240805A
  95. GRB 240805B Bassano Bresciano Observatory upper limit
  96. GRB240805A: Fermi GBM Observation
  97. GRB 240805B: JinShan optical afterglow detection
  98. GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
  99. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  100. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)

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