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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"

18330 results found.

  1. GRB 080607: AGILE-MCAL observation of the prompt emission
  2. GRB 080603B - TLS 2nd Epoch: Another Break
  3. GRB 080605: TLS 3rd Epoch - Source Confusion
  4. GRB080605: optical observation with the MITSuME-OAO telescope
  5. GRB080607: RTT150 optical observations
  6. GRB 080603A: optical observations
  7. GRB 080607: Swift-XRT refined analysis
  8. VLA detection of INTEGRAL burst GRB 080603A
  9. GRB 080607: Enhanced Swift-XRT position
  10. GRB 080605: GROND 2nd epoch observations
  11. GRB 080607: Keck/LRIS spectroscopy and redshift
  12. GRB 080607: Swift detection of a burst with optical afterglow
  13. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  14. GRB 080604: VLA radio upper limit
  15. GRB 080603B: VLA radio upper limit
  16. GRB 080605: MASTER VWF 46 s AT observation
  17. GRB 080605: Enhanced Swift-XRT position
  18. GRB 080605: GROND detection of the optical afterglow candidate
  19. GRB 080605: Liverpool Telescope optical afterglow candidate
  20. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  21. GRB 080605: Swift detection of a burst with an optical afterglow
  22. GRB 080603B: TLS Afterglow Observation
  23. GRB 080603A: TLS Afterglow Observation
  24. GRB 080604: MITSuME Okayama observation
  25. GRB 080604: Swift-XRT refined analysis
  26. GRB 080603B : Liverpool Telescope Observations
  27. GRB 080603A: Swift-XRT detection of the afterglow
  28. GRB 080604: Enhanced Swift-XRT position
  29. GRB 080604: Swift detection of a burst with an optical afterglow
  30. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  31. GRB 080516: TAROT La Silla observatory optical observations
  32. GRB080603B: NOT redshift
  33. GRB 080603B: BOOTES2/TELMA optical observations
  34. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  35. GRB 080603B: Swift detection of a burst with optical afterglow
  36. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  37. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  38. GRB 080602: Swift-XRT refined analysis
  39. GRB 080602: NOT R-band upper limit
  40. GRB 080602: Enhanced Swift-XRT position
  41. GRB 080602: Swift detection of a burst
  42. Swift analysis of BAT Slew Survey event (Trigger=009)
  43. GRB 080523: afterglow confirmation and redshift constraints
  44. GRB 080524: Swift XRT and UVOT analysis
  45. GRB 080503: 2nd Epoch Chandra X-ray Observations
  46. GRB 080524: Swift-BAT detection of a burst in ground analysis
  47. GRB 080523: VLT optical observations
  48. GRB 080523: Enhanced Swift-XRT position
  49. GRB 080523: Swift detection of a burst
  50. GRB 080515: KPNO 4m NIR afterglow detection
  51. GRB 80516: Swift/UVOT Observations
  52. GRB 080515: Swift-XRT position and analysis
  53. GRB 080514B: UVOT Observations
  54. GRB080520: Swift/UVOT observations
  55. GRB 080520, GROND observations
  56. GRB 080520: Enhanced Swift-XRT position
  57. GRB 080520: Swift XRT Refined Analysis
  58. GRB 080520: Swift detection of a burst with optical afterglow
  59. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  60. GRB 080514B: Further NIR observations
  61. GRB 080517: Enhanced Swift-XRT position
  62. GRB080517: Liverpool Telescope Optical Observations
  63. GRB 080517: Swift detection of a burst
  64. GRB 080516, GROND 2nd epoch observations
  65. GRB 080516, GROND observations
  66. GRB 080516, SMARTS optical/IR observations
  67. GRB 080516: Enhanced Swift-XRT position
  68. GRB 080516: Swift detection of a burst
  69. Errartum: VLA upper limit on GRB 080507
  70. VLA upper limit on GRB 080705
  71. IPN triangulation of bright GRB 080513
  72. GRB 080514B: slow fading behaviour ?
  73. GRB 080514B: Swift-XRT analysis
  74. GRB 080514B, GROND observations
  75. GRB 080515: Swift detection of a burst
  76. GRB 080514B: Watcher observations
  77. GRB 080514B: SuperAGILE/IPN GRB Localization
  78. Swift detection of a possible galactic transient
  79. GRB080514: REM NIR & Optical Observations
  80. GRB 080506: NAYUTA Optical Observation
  81. GRB 080507: Keck photometry
  82. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  83. GRB 080507: Optical Afterglow
  84. GRB 080506:Optical observations from HCT
  85. GRB 080506: VLA radio upper limit
  86. GRB 080506: Swift XRT refined analysis
  87. GRB080506: Swift/UVOT observations
  88. GRB080503, RIMOTS optical upper limit
  89. GRB 080506: Observations from NOT
  90. GRB 080506: Enhanced Swift-XRT position
  91. GRB 080506: Swift detection of a burst with optical afterglow
  92. GRB 080503: VLA radio upper limit
  93. GRB 080503: Observations from NOT
  94. GRB 080430: TLS imaging one day after the GRB
  95. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  96. GRB 080503: MITSuME Ishigakijima optical upper limits
  97. GRB 080430
  98. GRB 080430
  99. GRB 080503: Enhanced Swift-XRT position
  100. GRB 080503: MITSuME Akeno optical upper limits

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