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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

25807 results found.

  1. GRB 080613B, Swift-BAT refined analysis
  2. GRB 080613B: Swift-XRT refined analysis
  3. GRB 080514B: Spectroscopic constraints and probable host galaxy
  4. GRB 080613B: Swift detection of a burst
  5. GRB 080613: Faulkes Telescope North optical candidate
  6. GRB 080613 : a long GRB detected with INTEGRAL
  7. GRB 080603A: Late-time Keck imaging and spectroscopy
  8. GRB 080603b: optical observation
  9. GRB 080603A: final Swift-XRT observations.
  10. GRB 080607: AGILE-MCAL observation of the prompt emission
  11. GRB 080603B - TLS 2nd Epoch: Another Break
  12. GRB 080605: TLS 3rd Epoch - Source Confusion
  13. GRB080605: optical observation with the MITSuME-OAO telescope
  14. GRB080607: RTT150 optical observations
  15. GRB 080603A: optical observations
  16. GRB 080607: Swift-XRT refined analysis
  17. Swift/UVOT Observations of GRB080607
  18. VLA detection of INTEGRAL burst GRB 080603A
  19. GRB 080607: Enhanced Swift-XRT position
  20. GRB 080607, Swift-BAT refined analysis
  21. GRB 080605: GROND 2nd epoch observations
  22. GRB 080607: Keck/LRIS spectroscopy and redshift
  23. GRB 080607: Swift detection of a burst with optical afterglow
  24. GRB 080607: ROTSE-III Detection of Optical Counterpart
  25. GRB 080605: Swift-UVOT refined analysis
  26. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  27. GRB 080604: VLA radio upper limit
  28. GRB 080605, Swift-BAT refined analysis
  29. GRB 080603B: VLA radio upper limit
  30. GRB 080605, Swift-BAT refined analysis
  31. GRB 080605: Swift-XRT refined analysis
  32. GRB 080605: MASTER VWF 46 s AT observation
  33. GRB 080605: Enhanced Swift-XRT position
  34. GRB 080605: GROND detection of the optical afterglow candidate
  35. GRB 080605: Liverpool Telescope optical afterglow candidate
  36. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  37. GRB 080605: Swift detection of a burst with an optical afterglow
  38. GRB 080603B: TLS Afterglow Observation
  39. GRB 080603A: TLS Afterglow Observation
  40. GRB 080604: MITSuME Okayama observation
  41. GRB 080604, Swift-BAT refined analysis
  42. GRB 080604: Swift-XRT refined analysis
  43. GRB 080603B : Liverpool Telescope Observations
  44. Konus-Wind observation of GRB 080603B
  45. GRB 080603B: Swift-XRT refined analysis
  46. GRB 080603A: Swift-XRT detection of the afterglow
  47. GRB 080430: optical observations
  48. GRB 080603B: Swift/UVOT detection of the afterglow
  49. GRB 080604: Enhanced Swift-XRT position
  50. GRB 080603B, Swift-BAT refined analysis
  51. GRB080603B: RTT150 optical observations, break in light curves
  52. GRB 080604: Swift detection of a burst with an optical afterglow
  53. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  54. GRB 080516: TAROT La Silla observatory optical observations
  55. GRB080603B: NOT redshift
  56. GRB 080603B: BOOTES2/TELMA optical observations
  57. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  58. GRB 080603B: Swift detection of a burst with optical afterglow
  59. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  60. GRB 080603: A long GRB detected by INTEGRAL
  61. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  62. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  63. GRB 080602, Swift-BAT refined analysis
  64. GRB 080602: Swift-XRT refined analysis
  65. Konus-Wind observation of GRB 080602
  66. GRB 080602: NOT R-band upper limit
  67. GRB 080602: Enhanced Swift-XRT position
  68. GRB 080602: Swift detection of a burst
  69. Swift analysis of BAT Slew Survey event (Trigger=009)
  70. GRB 080523: afterglow confirmation and redshift constraints
  71. Konus-Wind observation of reactivation of SGR 1627-41
  72. GRB 080524: Swift XRT and UVOT analysis
  73. GRB 080503: 2nd Epoch Chandra X-ray Observations
  74. GRB 080524: Swift-BAT detection of a burst in ground analysis
  75. GRB 080523: Swift-XRT refined analysis
  76. GRB 080523, Swift-BAT refined analysis
  77. GRB 080523: VLT optical observations
  78. GRB 080523: Enhanced Swift-XRT position
  79. GRB 080523: Swift detection of a burst
  80. GRB 080515: KPNO 4m NIR afterglow detection
  81. GRB 80516: Swift/UVOT Observations
  82. GRB 080515: Swift-XRT position and analysis
  83. GRB 080520, Swift-BAT refined analysis
  84. GRB 080514B: UVOT Observations
  85. GRB080520: Swift/UVOT observations
  86. GRB 080520, GROND observations
  87. GRB 080520: Enhanced Swift-XRT position
  88. GRB 080520: Swift XRT Refined Analysis
  89. GRB 080520: Swift detection of a burst with optical afterglow
  90. GRB 080514B: Suzaku WAM observation of the prompt emission
  91. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  92. GRB 080517, Swift-BAT refined analysis
  93. GRB 080517: Swift-XRT refined analysis
  94. GRB 080514B: Further NIR observations
  95. GRB 080517: Enhanced Swift-XRT position
  96. GRB080517: Liverpool Telescope Optical Observations
  97. GRB 080517: Swift detection of a burst
  98. GRB 080516, GROND 2nd epoch observations
  99. GRB 080516, GROND observations
  100. GRB 080516, SMARTS optical/IR observations

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