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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"

37631 results found.

  1. GRB 151210A: GROND Afterglow Confirmation
  2. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  3. GRB 151210A: Swift detection of a burst
  4. GRB 151205C: Optical follow-up observations at Kiso
  5. GRB 151205A: Khureltogot upper limit
  6. GRB 151205B: Deep GROND Upper limits
  7. GRB 130831A: MASTER early OT detection and LC
  8. GRB 151205B: further Swift-XRT observations
  9. GRB 151205C: Swift-XRT observations
  10. GRB 151205B, Swift-BAT refined analysis
  11. GRB 151205A: Swift-XRT refined Analysis
  12. GRB 151205A, Swift-BAT refined analysis
  13. GRB 151205C: Tiled Swift observations
  14. GRB 151205C: MAXI/GSC detection
  15. GRB 151205B: MASTER-NET early optical observations
  16. GRB 151205A: Fermi GBM detection
  17. GRB 151205A: Garching Telescope Upper Limit
  18. GRB 151205B: Swift-XRT observations
  19. GRB 151205A: Swift/UVOT Upper Limits
  20. GRB 151205B: Swift detection of a burst
  21. GRB 151205A: Enhanced Swift-XRT position
  22. GRB 151205A: Swift detection of a burst
  23. GRB 151127A iTelescope observation
  24. Fermi GBM trigger 470712580/151202062 is not a GRB
  25. Fermi GBM trigger 470290196/151127174 is not a GRB
  26. GRB 151122A: Further Swift-XRT observations, no afterglow detected.
  27. Fermi GBM trigger 470375959/151128166 is not a GRB
  28. GRB 151127A: Swift/UVOT Upper Limits
  29. GRB 151127A: Swift-XRT refined Analysis
  30. GRB 151127A: Swift-BAT refined analysis
  31. GRB 151127A: Enhanced Swift-XRT position
  32. GRB151127A: Planned XMM-Newton observation
  33. GRB 151127A: GROND K-band upper limit
  34. GRB 151127A: LCOGT-SSO optical upper limits
  35. GRB 151127A: Swift detection of a short burst
  36. GRB 151118A iTelescope observation
  37. GRB 151122A: Swift/UVOT Observations
  38. GRB 151122A: Swift-XRT observations
  39. GRB 151122A: Fermi GBM detection
  40. GRB 151122A: Swift ToO observations
  41. GRB 151122A: Swift detection of a burst
  42. Konus-Wind observation of GRB 151120A
  43. GRB 151027A: Maidanak optical observations
  44. Swift Trigger 664610 is not astrophysical
  45. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  46. Swift Trigger 664610: is unlikely a GRB
  47. GRB 151118A: MITSuME Akeno optical upper limits
  48. GRB 151120A: Swift-XRT afterglow detection
  49. GRB 151120A: Fermi GBM observation
  50. GRB 151118A: AAO optical upper limit
  51. GRB 151120A: Swift ToO observations
  52. GRB 151120A: GROND optical/NIR afterglow
  53. GRB 151120A: A long GRB detected by INTEGRAL
  54. GRB 151118A, Swift-BAT refined analysis
  55. LIGO/Virgo G194575: Fermi GBM Observations
  56. 610 MHz detection of GRB 151027A with the GMRT
  57. GRB 151118A: Early optical limit from pt5m, La Palma
  58. GRB 151118A: ISON-NM early optical limit
  59. GRB 151118A: Swift-XRT refined Analysis
  60. GRB 151027A: SAO RAS and Mt. Terskol observations
  61. GRB 151118A: Swift/UVOT Upper Limits
  62. GRB 151118A: Enhanced Swift-XRT position
  63. GRB GRB 151118A: MASTER-NET optical observations
  64. GRB 151118A: Optical observations from OSN
  65. GRB 151118A: Swift detection of a burst
  66. GRB151027A; Optical observations
  67. GMRT radio detection of GRB 151027A
  68. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  69. GRB 151114A: Swift-XRT refined Analysis
  70. GRB 151107B: CALET Gamma-Ray Burst Monitor detection
  71. GRB 151114A: Swift-BAT refined analysis
  72. GRB 151112A: GROND photometric redshift and i'-band prediction
  73. GRB 151114A: Swift/UVOT Detection
  74. GRB 151114A: LCOGT-FTS afterglow observations
  75. GRB 151114A: Enhanced Swift-XRT position
  76. GRB 151114A: Swift detection of a burst with an optical counterpart
  77. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  78. GRB 151112A: Swift/UVOT Upper Limits
  79. GRB 151112A: MAXI/GSC detection
  80. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate
  81. GRB 151112A: Swift-XRT refined Analysis
  82. GRB 151112A: Swift-BAT refined analysis
  83. GRB 151112A: Enhanced Swift-XRT position
  84. GRB 151112A: MASTER-NET optical limit
  85. GRB 151112A: initial UVOT observations
  86. GRB 151112A: Swift-XRT observations
  87. GRB 151112A: Swift detection of a burst
  88. GRB 151111A: Swift/UVOT upper limits
  89. Swift-BAT trigger 663164 is not a burst.
  90. GRB 151111A: GROND marginal detection of a afterglow candidate
  91. LIGO/Virgo G194575: VLA follow-up
  92. GRB 151111A: Swift-XRT refined Analysis
  93. GRB 151111A: Fermi GBM observation
  94. GRB 151111A: LCOGT-FTS afterglow observations
  95. GRB 151111A: Swift-BAT refined analysis
  96. GRB 151111A: Enhanced Swift-XRT position
  97. GRB 151111A: Swift detection of a burst
  98. IPN triangulation of GRB151107B
  99. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  100. GRB 151027A: continued Mondy optical observations

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