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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"

21046 results found.

  1. Fermi GRB 240814C: Global MASTER-Net observations report
  2. Fermi trigger No 745306088: Global MASTER-Net observations report
  3. Fermi GRB 240814B: Global MASTER-Net observations report
  4. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  5. Fermi trigger No 745220784: Global MASTER-Net observations report
  6. GRB 240809A: ATA radio non-detection
  7. GRB 240809A : RAPAS follow-up observations
  8. GRB 240809A: VLA detection
  9. GRB 240809A: ALMA detection
  10. EP240807a: PRIME H-band upper limits
  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: Upper limits with Mephisto
  16. Fermi trigger No 745057312: Global MASTER-Net observations report
  17. Swift GRB 240811A: Global MASTER-Net observations report
  18. GRB240809A: Liverpool Telescope optical follow-up observations
  19. GRB 240809A: REM detection of the optical afterglow
  20. GRB 240809A: Bassano Bresciano Observatory optical observations
  21. Fermi-LAT gamma-ray observations of IceCube-240808A
  22. GRB 240809A: KAIT optical observations
  23. GRB 240809A: GIT afterglow observations
  24. GRB 240809A: Swift/UVOT Detection
  25. GRB 240809A: Tentative redshift from NOT
  26. X-ray Transient EP240807a: PRIME near-infrared upper limits
  27. Swift GRB 240809A: Global MASTER-Net observations report
  28. GRB 240809A: JinShan optical observations
  29. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  30. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  31. EP240807a: STEP/T80S optical limits
  32. IceCube Alert 240808.27: Global MASTER-Net observations report
  33. EP EP240807a: Global MASTER-Net observations report
  34. EP EP240806a: Global MASTER-Net observations report
  35. GRB 240805A: ATCA Radio Upper Limits
  36. Fermi trigger No 744761058: Global MASTER-Net observations report
  37. EP-WXT trigger 01709018832: KAIT optical observations of the star flare
  38. EP240806A: Liverpool Telescope optical follow-up observations
  39. EP240807a: EP-WXT detection of a fast X-ray transient
  40. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  41. GRB 240805B: GIT optical upper limit
  42. EP240806a: KAIT optical observations
  43. Fermi trigger No 744629911: Global MASTER-Net observations report
  44. EP240804a (GRB 240804B): NOT optical observations
  45. EP240806a: LCOGT optical counterpart detection
  46. GRB 240805B Bassano Bresciano Observatory upper limit
  47. GRB 240805B: JinShan optical afterglow detection
  48. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  49. EP 240806A: LCO optical observations
  50. EP240806a: GSP optical counterpart detection
  51. EP240806a: EP-WXT detection of a fast X-ray transient
  52. GRB 240805B: Optical detection with 1.6m Mephisto
  53. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  54. Fermi trigger No 744544656: Global MASTER-Net observations report
  55. GRB 240805B: Swift/UVOT Upper Limits
  56. GRB 240805A: Swift/UVOT Upper Limits
  57. Swift GRB 240805B: Global MASTER-Net observations report
  58. GRB 240805B: JinShan optical upper limits
  59. Fermi GRB 240805A: Global MASTER-Net observations report
  60. Swift GRB 240805A: Global MASTER-Net observations report
  61. EP240804a: GSP detects optical candidate counterpart
  62. EP240801a: Continued optical observations at ZTSh (CraO)
  63. EP240804a: VLT/X-shooter spectroscopic redshift
  64. EP240804a: LCOGT optical counterpart detection
  65. EP240804a: NOT optical counterpart detection
  66. EP240804a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  67. GRB 240805A: Swift detection of a burst
  68. Fermi GRB 240804A: Global MASTER-Net observations report
  69. EP240802a: Montarrenti Observatory optical upper limit
  70. Fermi trigger No 744459130: Global MASTER-Net observations report
  71. EP240801a: Osservatorio Astronomico Nastro Verde upper limit
  72. EP240802A: Bassano Bresciano Observatory upper limit
  73. GRB 240802A: SVOM/GRM observation
  74. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  75. Fermi trigger No 744278264: Global MASTER-Net observations report
  76. EP240802a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  77. EP240801a: further SAO RAS optical observations
  78. EP240801a: optical observations at CrAO and AbAO
  79. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  80. EP240801a: Leavitt Observatory optical observations
  81. EP240801a: GTC spectroscopy and absorption redshift
  82. EP240801a: SAO RAS optical observations
  83. EP240801a: JinShan optical observations
  84. EP240801a: NOT optical observations
  85. EP240801a: follow-up observation with LCOGT
  86. EP240801a: GSP follow-up observations of the candidate counterpart
  87. Fermi trigger No 744204856: Global MASTER-Net observations report
  88. EP240801a: Kinder follow-up observations of the candidate counterpart
  89. EP240708a: Kinder follow-up observations of the candidate counterpart (duplicate submission of GCN 37002)
  90. EP240801a: KAIT optical counterpart observations
  91. EP240801a: TRT optical counterpart detection
  92. EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  93. Fermi GRB 240801A: Global MASTER-Net observations report
  94. Fermi trigger No 744128417: Global MASTER-Net observations report
  95. Fermi trigger No 744083370: Global MASTER-Net observations report
  96. GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
  97. Fermi GRB 240730B: Global MASTER-Net observations report
  98. Swift GRB 240730A: Global MASTER-Net observations report
  99. GRB 240715A: Swift-XRT afterglow detection
  100. GRB 240730A: Swift/UVOT Upper Limits

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