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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"

24541 results found.

  1. Konus-Wind observation of GRB 151222A
  2. IPN Triangulation of GRB 151222A (short/hard)
  3. V404Cyg Swift Trigger 668097: MASTER-Tunka optical wake up detection
  4. V404Cyg Swift Trigger 668097:
  5. Trigger 668097: Swift detection of V 404 Cyg
  6. GRB 151222A: Fermi GBM detection
  7. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  8. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  9. GRB 151210B: Fermi GBM observation
  10. GRB151215A: Early optical light curve from pt5m, La Palma
  11. GRB 151215A: MITSuME Akeno optical upper limits
  12. GRB 151215A: Swift-BAT refined analysis
  13. GRB 151215A: MASTER early OT detection and light curve
  14. GRB 151215A: Swift detection of a burst
  15. LIGO/Virgo G184098: LOFAR follow-up
  16. GRB 151212A: GROND Optical Afterglow Candidate
  17. GRB 151212A: Swift-XRT afterglow detection
  18. GRB 151210A: Swift-BAT refined analysis
  19. GRB 151210A: GROND Afterglow Confirmation
  20. GRB 151205C: Optical follow-up observations at Kiso
  21. Swift detection of 4U 1850-03
  22. GRB 130831A: MASTER early OT detection and LC
  23. GRB 151205C: Swift-XRT observations
  24. GRB 151205B, Swift-BAT refined analysis
  25. GRB 151205A, Swift-BAT refined analysis
  26. GRB 151205B: MASTER-NET early optical observations
  27. GRB 151205A: Fermi GBM detection
  28. GRB 151205A: Garching Telescope Upper Limit
  29. GRB 151205B: Swift detection of a burst
  30. GRB 151127A: Swift-BAT refined analysis
  31. GRB 151127A: Swift detection of a short burst
  32. GRB 151122A: Swift-XRT observations
  33. GRB 151122A: Fermi GBM detection
  34. GRB 151122A: Swift detection of a burst
  35. Konus-Wind observation of GRB 151120A
  36. GRB 151027A: Maidanak optical observations
  37. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  38. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  39. Swift Trigger 664610: is unlikely a GRB
  40. GRB 151118A: MITSuME Akeno optical upper limits
  41. GRB 151120A: Fermi GBM observation
  42. LIGO/Virgo G194575: Updated significance from offline GW analysis
  43. GRB 151120A: A long GRB detected by INTEGRAL
  44. GRB 151118A, Swift-BAT refined analysis
  45. LIGO/Virgo G194575: Fermi GBM Observations
  46. GRB 151118A: Early optical limit from pt5m, La Palma
  47. GRB 151118A: Swift-XRT refined Analysis
  48. GRB GRB 151118A: MASTER-NET optical observations
  49. GRB 151118A: Optical observations from OSN
  50. GRB151027A; Optical observations
  51. GRB 151114A: Swift-BAT refined analysis
  52. GRB 151114A: LCOGT-FTS afterglow observations
  53. GRB 151114A: Swift detection of a burst with an optical counterpart
  54. GRB 151112A: Swift-BAT refined analysis
  55. GRB 151112A: Swift detection of a burst
  56. GRB 151111A: Swift-XRT refined Analysis
  57. GRB 151111A: Fermi GBM observation
  58. GRB 151111A: LCOGT-FTS afterglow observations
  59. GRB 151111A: Swift-BAT refined analysis
  60. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  61. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  62. LIGO/Virgo G194575: Liverpool Telescope observations of iPTF-15dld and iPTF-15dni
  63. GRB 151107A: Further investigation of the source nature
  64. GRB 151107B
  65. LIGO/Virgo G194575: Swift observations if iPTF15dld
  66. GRB 151027A: Hankasalmi optical observations
  67. LIGO/Virgo G194575: INAF-TNG/Asiago Telescope follow-up of iPTF15dld
  68. GRB 151107A: MASTER-NET optical observations
  69. GRB 151107A: Swift detection of a possible burst
  70. GRB 151027A: Mondy optical observations
  71. GRB 151029A: FRAM optical afterglow detection
  72. GRB 151031A: MITSuME Akeno optical upper limits
  73. GRB 151031A
  74. GRB 151030A: Fermi GBM observation
  75. GRB 151027B: RATIR Late-Time Upper Limits
  76. GRB 151031A: Swift-BAT refined analysis
  77. GRB 151031A: VLT/X-shooter optical counterpart and redshift
  78. GRB 151031A: Swift detection of a burst
  79. GRB 151027A: Continued P60 Monitoring
  80. LIGO/Virgo G194575: INAF-TNG follow-up of iPTF15dkm and iPTF15dlj
  81. Correction to the Trigger Time for Swift GRB 151029A
  82. GRB 151029A: MITSuME Ishigakijima upper limits
  83. GRB 151029A: LCOGT-FTS afterglow observations
  84. GRB 151029A: Swift-BAT refined analysis
  85. GRB 151027A: MAXI/GSC detection
  86. GRB 151029A: GROND afterglow observations
  87. GRB 151029A: Swift detection of a burst with an optical counterpart
  88. GRB 151027B: LCOGT FTN afterglow observations
  89. GRB 151027A: T100 observations
  90. Konus-Wind observation of GRB 151027A
  91. GRB 151027A : Xinglong TNT optical observation
  92. GRB 151027B: Swift-BAT refined analysis
  93. GRB 151027B: MASTER-NET early OT detection
  94. GRB 151027A: LCOGT-McDonald afterglow observations
  95. GRB 151027B: GROND Optical/NIR Afterglow Detection
  96. GRB 151027A: THO optical observations
  97. GRB 151027B: Swift detection of its 1000-th burst
  98. LIGO/Virgo G194575: iPTF Optical Transient Candidates
  99. GRB 151027A: Swift-BAT refined analysis
  100. GRB 151027A: Early RAPTOR Observations

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