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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"

32757 results found.

  1. GRB 240809A: Correction to the VLA source position in GCN 37158
  2. GRB 240810A: SVOM/GRM observation
  3. GRB 240809A: ATA radio non-detection
  4. GRB 240809A : RAPAS follow-up observations
  5. GRB 240809A: VLA detection
  6. GRB 240809A: ALMA detection
  7. IPN triangulation of GRB 240810A (short)
  8. GRB 240811A: Swift-BAT refined analysis
  9. GRB 240809A: Swift-BAT refined analysis
  10. EP240807a: PRIME H-band upper limits
  11. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  12. GRB 240811A: Bassano Bresciano Observatory upper limit
  13. GRB 240811A: Swift/UVOT Upper Limits
  14. EP240801a: Assy-Turgen optical observations
  15. Fermi GRB 240810A: Global MASTER-Net observations report
  16. GRB 240811A: LCOGT Optical Upper Limit
  17. GRB 240811A: Upper limits with Mephisto
  18. Konus-Wind detection of GRB 240809A
  19. Swift GRB 240811A: Global MASTER-Net observations report
  20. GRB240809A: Liverpool Telescope optical follow-up observations
  21. GRB 240809A: REM detection of the optical afterglow
  22. GRB 240809A: Bassano Bresciano Observatory optical observations
  23. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  24. GRB 240809A: Conclusive redshift from VLT
  25. Fermi-LAT gamma-ray observations of IceCube-240808A
  26. GRB 240809A: KAIT optical observations
  27. GRB 240808A: AstroSat CZTI detection
  28. GRB 240809A: GIT afterglow observations
  29. GRB 240809A: Swift/UVOT Detection
  30. GRB 240809A: Tentative redshift from NOT
  31. IPN triangulation of GRB 240807A / EP 240807a
  32. LIGO/Virgo/KAGRA S240807h: Updated Sky localization and EM Bright Classification
  33. X-ray Transient EP240807a: PRIME near-infrared upper limits
  34. Swift GRB 240809A: Global MASTER-Net observations report
  35. GRB 240809A: JinShan optical observations
  36. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  37. GRB 240809A: SVOM/GRM observation
  38. GRB 240807A: SVOM/GRM observation
  39. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  40. EP240807a: STEP/T80S optical limits
  41. GRB 240807B: AstroSat CZTI detection of a short burst
  42. EP EP240807a: Global MASTER-Net observations report
  43. EP EP240806a: Global MASTER-Net observations report
  44. GRB 240801A: GRBAlpha detection
  45. GRB 240710B: VZLUSAT-2 detection
  46. GRB 240805A: ATCA Radio Upper Limits
  47. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  48. S240807h: Identification of a GW compact binary merger candidate
  49. EP240802a/GRB240802A: KAIT optical upper limit
  50. GRB 240720B: VZLUSAT-2 detection
  51. GRB 240710A: VZLUSAT-2 detection
  52. EP240806A: Liverpool Telescope optical follow-up observations
  53. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  54. GRB 240805B: GIT optical upper limit
  55. EP240806a: KAIT optical observations
  56. GRB 240805B: Swift-BAT refined analysis
  57. GRB 240805A: Swift-BAT refined analysis
  58. EP240804a (GRB 240804B): NOT optical observations
  59. EP240806a: LCOGT optical counterpart detection
  60. Konus-Wind detection of GRB 240802A (EP240802a)
  61. Improved IPN triangulation of GRB 240802A / EP 240802a
  62. Konus-Wind detection of GRB 240805A
  63. GRB 240805B Bassano Bresciano Observatory upper limit
  64. GRB240805A: Fermi GBM Observation
  65. GRB 240805B: JinShan optical afterglow detection
  66. GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
  67. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  68. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  69. EP240806a: EP-FXT detection of the X-ray emission
  70. GRB 240624B: VZLUSAT-2 detection
  71. GRB 240619C: VZLUSAT-2 detection
  72. EP 240806A: LCO optical observations
  73. GRB 240805B: Optical detection with 1.6m Mephisto
  74. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  75. GRB 240805B: Swift/UVOT Upper Limits
  76. GRB 240805A: Swift/UVOT Upper Limits
  77. GRB 240805B: BTA optical afterglow candidate
  78. GRB 240805A: SVOM/GRM observation
  79. GRB 240805B: LCOGT Optical Upper Limits
  80. Swift GRB 240805B: Global MASTER-Net observations report
  81. GRB 240805B: JinShan optical upper limits
  82. EP240801a: BTA BVRI photometry
  83. Fermi GRB 240805A: Global MASTER-Net observations report
  84. Swift GRB 240805A: Global MASTER-Net observations report
  85. GRB 240805A: Fermi-LAT detection
  86. GRB 240805A: INTEGRAL spectral analysis
  87. EP240801a: Continued optical observations at ZTSh (CraO)
  88. EP240804a: VLT/X-shooter spectroscopic redshift
  89. EP240804a: LCOGT optical counterpart detection
  90. GRB 240805A: A long GRB detected by INTEGRAL
  91. EP240804a: NOT optical counterpart detection
  92. EP240802a: correction of EP-WXT trigger time in GCN 37019
  93. Fermi GRB 240804A: Global MASTER-Net observations report
  94. EP240802a: Montarrenti Observatory optical upper limit
  95. IPN triangulation of GRB 240802A / EP 240802a
  96. EP240801a: Osservatorio Astronomico Nastro Verde upper limit
  97. EP240802A: Bassano Bresciano Observatory upper limit
  98. GRB 240802A: SVOM/GRM observation
  99. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  100. EP240801a: further SAO RAS optical observations

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