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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"

28235 results found.

  1. GRB 151228B: Enhanced Swift-XRT position
  2. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  3. GRB 151228B: Swift detection of a burst with an optical detection
  4. LIGO/Virgo G211117: MASTER Observations and Inspection + OT
  5. LIGO/Virgo G211117: INTEGRAL was inactive at the time of the event
  6. LIGO/Virgo G211117: INAF VST-ESO PARANAL observations
  7. LIGO/Virgo G211117: Further Swift-XRT sources
  8. LIGO/Virgo G211117: Swift-XRT sources
  9. LIGO/Virgo G211117: Identification of a GW CBC Candidate
  10. GRB 151227B: Fermi GBM detection
  11. GRB 151227A: Fermi GBM detection
  12. GRB 151212A iTelescope observation
  13. Konus-Wind observation of GRB 151222A
  14. V404Cyg Swift Trigger 668097: TSHAO optical observations
  15. GRB 151222A: Fermi GBM detection
  16. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  17. GRB 151215A: TSHAO optical observations
  18. GRB151215A: Continued P60 Observations
  19. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  20. GRB 151216A: MAXI/GSC detection
  21. GRB 151210B: Fermi GBM observation
  22. GRB151215A: Early optical light curve from pt5m, La Palma
  23. GRB 151215A: Swift-XRT refined Analysis
  24. GRB 151215A: Swift-BAT refined analysis
  25. GRB151215A: Swift/UVOT detection
  26. GRB 151215A: Enhanced Swift-XRT position
  27. GRB 151215A: GROND Detection of the Optical/NIR Afterglow
  28. GRB 151215A: Swift detection of a burst
  29. LIGO/Virgo G184098: LOFAR follow-up
  30. GRB151212A: Swift/UVOT observations
  31. GRB 151212A: GROND Optical Afterglow Candidate
  32. GRB 151212A: MAXI/GSC detection
  33. GRB 151210A: Swift/UVOT Upper Limits
  34. GRB 151210A: Swift-BAT refined analysis
  35. GRB 151210A: Swift-XRT refined Analysis
  36. GRB 151210A: Enhanced Swift-XRT position
  37. GRB 151210A: GROND Afterglow Confirmation
  38. GRB 151210A: Optical afterglow candidate from LCOGT-Cerro Tololo
  39. GRB 151210A: Swift detection of a burst
  40. GRB 151205C: Optical follow-up observations at Kiso
  41. GRB 151205A: Khureltogot upper limit
  42. GRB 151205B: Deep GROND Upper limits
  43. GRB 130831A: MASTER early OT detection and LC
  44. GRB 151205B: further Swift-XRT observations
  45. GRB 151205C: Swift-XRT observations
  46. GRB 151205B, Swift-BAT refined analysis
  47. GRB 151205A: Swift-XRT refined Analysis
  48. GRB 151205A, Swift-BAT refined analysis
  49. GRB 151205C: MAXI/GSC detection
  50. GRB 151205B: MASTER-NET early optical observations
  51. GRB 151205A: Fermi GBM detection
  52. GRB 151205A: Garching Telescope Upper Limit
  53. GRB 151205B: Swift-XRT observations
  54. GRB 151205A: Swift/UVOT Upper Limits
  55. GRB 151205A: Enhanced Swift-XRT position
  56. GRB 151205A: Swift detection of a burst
  57. GRB 151127A iTelescope observation
  58. LIGO/Virgo G184098: Results of of 2nd epoch of ASKAP follow-up
  59. GRB 151122A: Further Swift-XRT observations, no afterglow detected.
  60. GRB 151127A: Swift/UVOT Upper Limits
  61. GRB 151127A: Swift-XRT refined Analysis
  62. GRB 151127A: Swift-BAT refined analysis
  63. GRB 151127A: Enhanced Swift-XRT position
  64. GRB 151127A: GROND K-band upper limit
  65. GRB 151127A: LCOGT-SSO optical upper limits
  66. GRB 151127A: Swift detection of a short burst
  67. GRB 151118A iTelescope observation
  68. GRB 151122A: Swift/UVOT Observations
  69. GRB 151122A: Swift-XRT observations
  70. GRB 151122A: Fermi GBM detection
  71. GRB 151122A: Swift detection of a burst
  72. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  73. Swift Trigger 664610 is not astrophysical
  74. Swift Trigger 664610: is unlikely a GRB
  75. GRB 151120A: Swift-XRT afterglow detection
  76. GRB 151118A: AAO optical upper limit
  77. LIGO/Virgo G194575: Updated significance from offline GW analysis
  78. GRB 151120A: GROND optical/NIR afterglow
  79. GRB 151118A, Swift-BAT refined analysis
  80. GRB 151118A: Early optical limit from pt5m, La Palma
  81. GRB 151118A: ISON-NM early optical limit
  82. GRB 151118A: Swift-XRT refined Analysis
  83. GRB 151027A: SAO RAS and Mt. Terskol observations
  84. GRB 151118A: Swift/UVOT Upper Limits
  85. GRB 151118A: Enhanced Swift-XRT position
  86. GRB GRB 151118A: MASTER-NET optical observations
  87. GRB 151118A: Optical observations from OSN
  88. GRB 151118A: Swift detection of a burst
  89. GRB151027A; Optical observations
  90. GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
  91. GRB 151114A: Swift-XRT refined Analysis
  92. GRB 151114A: Swift-BAT refined analysis
  93. GRB 151114A: Swift/UVOT Detection
  94. GRB 151114A: LCOGT-FTS afterglow observations
  95. GRB 151114A: Enhanced Swift-XRT position
  96. GRB 151114A: Swift detection of a burst with an optical counterpart
  97. GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate
  98. GRB 151112A: Swift/UVOT Upper Limits
  99. GRB 151112A: MAXI/GSC detection
  100. GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate

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