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

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