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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"

28221 results found.

  1. GRB 240627A: NuSTAR Detection of the long GRB
  2. GRB 240615A: SAI CMO J- band observations
  3. GRB 240627A: AstroSat CZTI detection
  4. EP240626a: EP-FXT detection of the X-ray emission
  5. Konus-Wind detection of GRB 240619A
  6. EP240626a: BOOTES-7 optical upper limit
  7. EP240626a: EP-WXT detection of a fast X-ray transient
  8. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  9. GRB 240625B: Fermi GBM Final Real-time Localization
  10. EP240625a: EP-FXT detection of the X-ray emission
  11. GRB 240624B: GRBAlpha detection
  12. GRB 240625A: Fermi GBM Final Real-time Localization
  13. EP240625a: EP-WXT detection of a fast X-ray transient
  14. GRB240615A: Gemini-North observations of the BAT and XRT positions
  15. GRB 240624B: Fermi GBM Final Real-time Localization
  16. GRB240615A: Gemini-North observations of the BAT and XRT positions
  17. GRB 240624A: Fermi GBM Final Real-time Localization
  18. GRB 240619A: detection of a radio counterpart with AMI-LA
  19. GRB 240624A: Swift detection of a burst
  20. LIGO/Virgo/KAGRA S240623dg: Retraction of GW compact binary merger candidate
  21. GRB 240619A: J-band detection with WINTER (duplicate submission of GCN 36739)
  22. GRB 240619A: J-band detection with WINTER
  23. GRB 240529A: JinShan optical observations
  24. EP240618a: GSP optical upper limit
  25. IPN triangulation of GRB 240615A (short)
  26. X-ray transient EP240618a: Fermi/GBM non-detection
  27. GRB 240619A: GRBAlpha detection
  28. EP240618a: Swift/XRT upper limit
  29. EP240617a: tentative Swift/XRT detection of the afterglow
  30. GRB 240619A: Swift-XRT probable afterglow detection
  31. GRB 240619A: Swift ToO observations
  32. GRB 240619A: CALET Gamma-Ray Burst Monitor detection
  33. GRB 240619C: NuSTAR automated detection of the GRB
  34. Fermi GBM Sub-Threshold Detection of GRB 240619C
  35. GRB 240619A: GOTO candidate optical afterglow
  36. GRB 240615A: NOT optical observations
  37. GRB 240619C: AstroSat CZTI detection
  38. GRB 240615A: possible transient detection from Wendelstein observations
  39. EP240618a: OHP/T193 MISTRAL i' and Y band upper limits
  40. EP240618a: BOOTES-6/DPRT optical upper limit
  41. GRB 240619B: Fermi GBM Final Real-time Localization
  42. LIGO/Virgo S240615dg: Swift XRT observations, 39 X-ray sources
  43. GRB240615A: 1.3m DFOT optical upper limit
  44. GRB 240619A: Fermi GBM Final Real-time Localization
  45. EP240617a: BOOTES-6/DPRT optical upper limit
  46. EP240617a is likely a GRB event
  47. EP240617a: EP-WXT detection of a fast X-ray transient
  48. EP240618a: EP-WXT detection of a fast X-ray transient and EP-FXT quick follow-up
  49. GRB 240615A: J-band upper limits from WINTER
  50. GRB 240615A: Swift-XRT observations
  51. GRB 240615A: GECAM detection
  52. Konus-Wind detection of GRB 240615A (short/hard)
  53. GRB 240616A: Fermi GBM Final Real-time Localization
  54. GRB 240615A: Swift ToO observations
  55. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  56. GRB 240615A: Fermi GBM Final Real-time Localization
  57. GRB 240603A: VZLUSAT-2 detection
  58. GRB 240612A: GRBAlpha detection
  59. GRB 240613A: Fermi GBM Final Real-time Localization
  60. GRB 240612B: Fermi GBM Final Real-time Localization
  61. GRB 240612A: Fermi GBM Final Real-time Localization
  62. GRB 240607A: GECAM detection of a bright long burst
  63. Konus-Wind detection of GRB 240607A
  64. GRB 240611A: Fermi GBM Final Real-time Localization
  65. GRB240529A: 3.6m TNG NIR detection 8d after the burst
  66. GRB 240529A: LBT optical detection and late temporal decay
  67. GRB 240529A : MITSuME Akeno optical afterglow detection
  68. Trigger 1236151: Swift detection of EXO 0748-676
  69. GRB 240610A: Fermi GBM Final Real-time Localization
  70. IPN triangulation of GRB 240607A
  71. Konus-Wind detection of GRB 240606B
  72. GRB 240608A: Fermi GBM Final Real-time Localization
  73. GRB 240529A: NOEMA detection
  74. GRB 240607A: AstroSat CZTI detection of bright long burst
  75. GRB 240607A: Fermi GBM detection of a very bright burst
  76. GRB 240529A: radio detection with AMI-LA
  77. GRB 240607A: Fermi GBM Final Real-time Localization
  78. GRB 240606B: GECAM-B detection a long burst
  79. GRB 240606B: Swift-XRT afterglow detection
  80. GRB 240606B: Swift ToO observations
  81. GRB 240606B: Swift/BAT-GUANO arcminute localization of a burst
  82. Konus-Wind detection of GRB 240603A
  83. Swift Trigger 1235109: a possible GRB 240606A
  84. IPN triangulation of GRB 240531A (short)
  85. GRB 240605C: Fermi GBM Final Real-time Localization
  86. IPN triangulation of GRB 240603A
  87. GRB 240605B: Fermi GBM Final Real-time Localization
  88. GRB 240604A: Fermi GBM Final Localization
  89. GRB 240605A: Fermi GBM Final Real-time Localization
  90. GRB 240604A: GECAM detection of a long burst
  91. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  92. GRB 240603A: Fermi GBM Final Localization
  93. GRB 240603C: Fermi GBM Final Real-time Localization
  94. Swift Trigger 1232465: consistent with noise
  95. GRB 240603B: Swift detection of a possible burst
  96. GRB 240529A: MASTER prompt OT detection
  97. GRB 240603A: GECAM detection of a short burst
  98. GRB 240529A: OSN optical detection
  99. The EP-WXT source triggered on June 1st is likely a flaring star
  100. GRB 240602A: Fermi GBM Final Real-time Localization

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