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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"

31633 results found.

  1. GRB 080603A: Swift/UVOT detection of the afterglow
  2. GRB080603B: RTT150 optical observations, break in light curves
  3. GRB 080604: Early Super-LOTIS Observations
  4. GRB080604: confirmation of optical afterglow
  5. GRB080603B: NOT redshift
  6. GRB 080603B: BOOTES2/TELMA optical observations
  7. GRB080603: Super-LOTIS detection of Optical Counterpart
  8. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  9. GRB 080603: Gemini-North redshift
  10. GRB 080602, Swift-BAT refined analysis
  11. GRB 080602: Swift-XRT refined analysis
  12. Konus-Wind observation of GRB 080602
  13. GRB 080602: NOT R-band upper limit
  14. Swift analysis of BAT Slew Survey event (Trigger=009)
  15. GRB 080523: afterglow confirmation and redshift constraints
  16. Konus-Wind observation of reactivation of SGR 1627-41
  17. Reactivation of SGR 1627-41
  18. GRB 080524: Swift XRT and UVOT analysis
  19. GRB 080503: 2nd Epoch Chandra X-ray Observations
  20. GRB 080523: Swift-XRT refined analysis
  21. GRB 080523, Swift-BAT refined analysis
  22. GRB 080520: VLT host detection
  23. GRB 080523: VLT optical observations
  24. Swift/UVOT observations of GRB 080523
  25. GRB 080515: KPNO 4m NIR afterglow detection
  26. GRB 80516: Swift/UVOT Observations
  27. GRB 080515: Swift-XRT position and analysis
  28. GRB 080520, Swift-BAT refined analysis
  29. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  30. GRB 080514B: UVOT Observations
  31. GRB080520: Swift/UVOT observations
  32. GRB 080520: VLT redshift
  33. GRB 080520, GROND observations
  34. GRB 080520: Swift XRT Refined Analysis
  35. Konus-Wind observation of GRB 080514B
  36. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  37. GRB 080503: Further HST imaging
  38. GRB 080517, Swift-BAT refined analysis
  39. GRB 080516, GROND further analysis
  40. GRB 080517: Swift-XRT refined analysis
  41. GRB 080514B: Further NIR observations
  42. GRB080517: Liverpool Telescope Optical Observations
  43. GRB 080516, GROND 2nd epoch observations
  44. GRB 080516, GROND observations
  45. GRB080430: optical observations
  46. GRB 080516, SMARTS optical/IR observations
  47. GRB 080516: Swift-XRT Team refined analysis
  48. GRB 080516, Swift-BAT refined analysis
  49. GRB 080514B: NOT observations
  50. Errartum: VLA upper limit on GRB 080507
  51. VLA upper limit on GRB 080705
  52. GRB 080514B : redshift estimation
  53. Konus-Wind observation of GRB 080513
  54. Swift-BAT refined analysis for Trigger 311603: Galactic source
  55. GRB 080515, Swift-BAT refined analysis
  56. GRB 080514B: KPNO 4m IR observations
  57. GRB 080514B: slow fading behaviour ?
  58. GRB 080514B: Swift-XRT analysis
  59. GRB 080514B, GROND observations
  60. GRB 080514B: Finding chart
  61. GRB 080514B: Afterglow candidate
  62. GRB 080514B: Watcher observations
  63. GRB 080514B: possible AGILE detection at E>50 MeV
  64. procesure for GRB Circular
  65. Konus-Wind observation of GRB 080507
  66. GRB 080506: NAYUTA Optical Observation
  67. GRB 080507: Suzaku WAM observation of the prompt emission
  68. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  69. GRB 080507: Keck photometry
  70. GRB 080507: E Pur Si Muove!
  71. GRB 080503: Hubble Space Telescope Imaging
  72. GRB080507: Swift/UVOT followup observations
  73. GRB 080507: Optical Afterglow
  74. GRB 080506:Optical observations from HCT
  75. GRB 080507: Swift-XRT position of a possible afterglow
  76. GRB 080506: VLA radio upper limit
  77. GRB 080506: TLS 2nd Epoch - possible light curve break
  78. GRB 080503: Fading in continued Gemini imaging
  79. GRB 080506: Swift XRT refined analysis
  80. GRB080506: Swift/UVOT observations
  81. GRB 080506, Swift-BAT refined analysis
  82. GRB080503, RIMOTS optical upper limit
  83. GRB 080506: Observations from NOT
  84. GRB 080506: optical observation from Ondrejov
  85. GRB 080506: TLS afterglow detection in VRIZ
  86. GRB 080506: Optical observation with KANATA/TRISPEC
  87. GRB 080503: VLA radio upper limit
  88. GRB 080503: Observations from NOT
  89. GRB 080503: Slow-rise optical AG ?
  90. GRB 080430: TLS imaging one day after the GRB
  91. GRB 080503: No further optical rebrightening
  92. GRB 080503: Late-time Optical rebrightening (possible mini-SN)
  93. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  94. GRB 080503: MITSuME Ishigakijima optical upper limits
  95. GRB080503: Swift/UVOT Upper Limits
  96. GRB080503 XRT refined analysis
  97. GRB 080503, Swift-BAT refined analysis
  98. GRB 080430
  99. GRB 080430
  100. GRB 080503: MITSuME Akeno optical upper limits

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