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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"

43678 results found.

  1. GRB 151228B: Enhanced Swift-XRT position
  2. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  3. LIGO/Virgo G211117: Fermi GBM Observations
  4. GRB 151228B: Swift detection of a burst with an optical detection
  5. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  6. LIGO/Virgo G211117: INTEGRAL was inactive at the time of the event
  7. GRB 151228A: Fermi GBM observation
  8. LIGO/Virgo G211117: Pan-STARRS1 observations 2015-12-28
  9. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  10. LIGO/Virgo G211117: Further Swift-XRT sources
  11. LIGO/Virgo G211117: Swift-XRT sources
  12. GRB 151228A: Swift detection of a short burst
  13. LIGO/Virgo G211117: SWASP optical observations
  14. LIGO/Virgo G211117: Identification of a GW CBC Candidate
  15. GRB 151227B: Fermi GBM detection
  16. GRB 151227A: Fermi GBM detection
  17. GRB 151212A iTelescope observation
  18. GRB 151225A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB
  19. Konus-Wind observation of GRB 151222A
  20. Fermi GBM trigger 472694170/151224997 is not a GRB
  21. V404Cyg Swift Trigger 668097: TSHAO optical observations
  22. IPN Triangulation of GRB 151222A (short/hard)
  23. Fermi GBM trigger 151221730 is not a GRB
  24. Trigger 668097: Swift detection of V 404 Cyg
  25. GRB 151222A: Fermi GBM detection
  26. Fermi GBM trigger 151221690 is not a GRB
  27. Fermi GBM trigger 472271765/151220108 is not a GRB
  28. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  29. Fermi GBM trigger 472166503/151218890 is not a GRB
  30. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  31. GRB 151215A: TSHAO optical observations
  32. GRB151215A: Continued P60 Observations
  33. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  34. GRB 151216A: MAXI/GSC detection
  35. GRB 151210B: Fermi GBM observation
  36. GRB151215A: Early optical light curve from pt5m, La Palma
  37. GRB 151210B: CALET Gamma-Ray Burst Monitor detection
  38. GRB 151215A: Swift-XRT refined Analysis
  39. GRB 151215A: Swift-BAT refined analysis
  40. GRB 151215A: MASTER early OT detection and light curve
  41. GRB 151215A: NOT spectroscopy and redshift
  42. GRB 151215A: Enhanced Swift-XRT position
  43. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  44. GRB 151215A: Prompt enhanced Swift-XRT position
  45. GRB151215A: P60 Optical Afterglow Candidate
  46. GRB 151215A: Swift detection of a burst
  47. LIGO/Virgo G184098: LOFAR follow-up
  48. GRB 151212A: GROND Optical Afterglow Candidate
  49. GRB 151212A: Swift-XRT afterglow detection
  50. GRB 151212A: Tiled Swift observations
  51. GRB 151212A: MAXI/GSC detection
  52. GRB 151210A: Swift/UVOT Upper Limits
  53. GRB 151210A: Swift-BAT refined analysis
  54. GRB 151210A: Swift-XRT refined Analysis
  55. GRB 151210A: Enhanced Swift-XRT position
  56. GRB 151210A: GROND Afterglow Confirmation
  57. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  58. GRB 151210A: Swift detection of a burst
  59. GRB 151205C: Optical follow-up observations at Kiso
  60. GRB 151205A: Khureltogot upper limit
  61. Swift detection of 4U 1850-03
  62. GRB 151205B: Deep GROND Upper limits
  63. GRB 130831A: MASTER early OT detection and LC
  64. GRB 151205B: further Swift-XRT observations
  65. GRB 151205C: Swift-XRT observations
  66. GRB 151205B, Swift-BAT refined analysis
  67. GRB 151205A: Swift-XRT refined Analysis
  68. GRB 151205A, Swift-BAT refined analysis
  69. GRB 151205C: Tiled Swift observations
  70. GRB 151205C: MAXI/GSC detection
  71. GRB 151205B: MASTER-NET early optical observations
  72. GRB 151205A: Fermi GBM detection
  73. GRB 151205A: Garching Telescope Upper Limit
  74. GRB151205B: Initial UVOT observations
  75. GRB 151205B: Swift detection of a burst
  76. GRB 151205A: Enhanced Swift-XRT position
  77. GRB 151205A: Swift detection of a burst
  78. GRB 151127A iTelescope observation
  79. LIGO/Virgo G184098: Results of of 2nd epoch of ASKAP follow-up
  80. Fermi GBM trigger 470712580/151202062 is not a GRB
  81. Fermi GBM trigger 470290196/151127174 is not a GRB
  82. GRB 151122A: Further Swift-XRT observations, no afterglow detected.
  83. Fermi GBM trigger 470375959/151128166 is not a GRB
  84. GRB 151127A: Swift/UVOT Upper Limits
  85. GRB 151127A: Swift-XRT refined Analysis
  86. GRB 151127A: Swift-BAT refined analysis
  87. GRB 151127A: Enhanced Swift-XRT position
  88. GRB151127A: Planned XMM-Newton observation
  89. GRB 151127A: GROND K-band upper limit
  90. GRB 151127A: Swift detection of a short burst
  91. GRB 151118A iTelescope observation
  92. GRB 151122A: Swift/UVOT Observations
  93. GRB 151122A: Swift-XRT observations
  94. GRB 151122A: Fermi GBM detection
  95. GRB 151122A: Swift ToO observations
  96. GRB 151122A: Swift detection of a burst
  97. Konus-Wind observation of GRB 151120A
  98. GRB 151027A: Maidanak optical observations
  99. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  100. Swift Trigger 664610 is not astrophysical

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