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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"
  1. GRB 080604: Xinglong R band observation
  2. GRB 080603A: Xinglong R band observation
  3. GRB 080603B: TLS Afterglow Observation
  4. GRB 080603A: TLS Afterglow Observation
  5. GRB 080604: MITSuME Okayama observation
  6. Swift/UVOT observations of GRB080604
  7. GRB080604: HET redshift retraction
  8. GRB 080604: Gemini-North spectroscopy
  9. GRB 080604, Swift-BAT refined analysis
  10. GRB 080604: Swift-XRT refined analysis
  11. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  12. GRB 080603B : Xinglong EST observations
  13. GRB 080603B : Liverpool Telescope Observations
  14. Konus-Wind observation of GRB 080603B
  15. GRB 080603B: Swift-XRT refined analysis
  16. GRB 080603A: Swift-XRT detection of the afterglow
  17. GRB 080430: optical observations
  18. GRB 080603B: Swift/UVOT detection of the afterglow
  19. GRB 080604: Enhanced Swift-XRT position
  20. GRB 080603B, Swift-BAT refined analysis
  21. GRB 080604: Hobby-Eberly Telescope spectroscopy
  22. GRB 080603A: Swift/UVOT detection of the afterglow
  23. GRB080603B: RTT150 optical observations, break in light curves
  24. GRB 080604: Early Super-LOTIS Observations
  25. GRB080604: confirmation of optical afterglow
  26. GRB 080604: Swift detection of a burst with an optical afterglow
  27. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  28. GRB 080516: TAROT La Silla observatory optical observations
  29. GRB080603B: NOT redshift
  30. GRB 080603B: BOOTES2/TELMA optical observations
  31. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  32. GRB 080603B: Swift detection of a burst with optical afterglow
  33. GRB080603: Super-LOTIS detection of Optical Counterpart
  34. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  35. GRB 080603: Gemini-North redshift
  36. GRB 080603: A long GRB detected by INTEGRAL
  37. GRB 080603 OA candidate
  38. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  39. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  40. GRB 080602, Swift-BAT refined analysis
  41. GRB 080602: Swift-XRT refined analysis
  42. Konus-Wind observation of GRB 080602
  43. GRB 080602: NOT R-band upper limit
  44. GRB 080602: Enhanced Swift-XRT position
  45. GRB 080602: Swift detection of a burst
  46. Swift analysis of BAT Slew Survey event (Trigger=009)
  47. GRB 080523: afterglow confirmation and redshift constraints
  48. Konus-Wind observation of reactivation of SGR 1627-41
  49. Reactivation of SGR 1627-41
  50. GRB 080524: Swift XRT and UVOT analysis
  51. GRB 080503: 2nd Epoch Chandra X-ray Observations
  52. GRB 080524: Swift-BAT detection of a burst in ground analysis
  53. GRB 080523: Swift-XRT refined analysis
  54. GRB 080523, Swift-BAT refined analysis
  55. GRB 080520: VLT host detection
  56. GRB 080523: VLT optical observations
  57. Swift/UVOT observations of GRB 080523
  58. GRB 080523: Enhanced Swift-XRT position
  59. GRB 080523: Swift detection of a burst
  60. GRB 080515: NIR magnitude correction
  61. GRB 080515: KPNO 4m NIR afterglow detection
  62. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  63. GRB 80516: Swift/UVOT Observations
  64. GRB 080515: Swift-XRT position and analysis
  65. GRB 080520, Swift-BAT refined analysis
  66. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  67. GRB 080514B: UVOT Observations
  68. GRB080520: Swift/UVOT observations
  69. GRB 080520: VLT redshift
  70. GRB 080520, GROND observations
  71. GRB 080520: Enhanced Swift-XRT position
  72. GRB 080520: Swift XRT Refined Analysis
  73. GRB 080520: Swift detection of a burst with optical afterglow
  74. GRB 080514B: Suzaku WAM observation of the prompt emission
  75. Konus-Wind observation of GRB 080514B
  76. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  77. GRB 080503: Further HST imaging
  78. GRB 080517, Swift-BAT refined analysis
  79. GRB 080516, GROND further analysis
  80. GRB 080517: Swift-XRT refined analysis
  81. GRB 080514B: Further NIR observations
  82. GRB 080517: Enhanced Swift-XRT position
  83. GRB080517: Liverpool Telescope Optical Observations
  84. GRB 080517: Swift detection of a burst
  85. GRB 080516, GROND 2nd epoch observations
  86. GRB 080516, GROND observations
  87. GRB080430: optical observations
  88. GRB 080516, SMARTS optical/IR observations
  89. GRB 080516: Swift-XRT Team refined analysis
  90. GRB 080516, Swift-BAT refined analysis
  91. GRB 080516: Enhanced Swift-XRT position
  92. GRB 080514B: NOT observations
  93. GRB 080516: Swift detection of a burst
  94. Errartum: VLA upper limit on GRB 080507
  95. VLA upper limit on GRB 080705
  96. GRB 080514B : redshift estimation
  97. Konus-Wind observation of GRB 080513
  98. IPN triangulation of bright GRB 080513
  99. Swift-BAT refined analysis for Trigger 311603: Galactic source
  100. GRB 080515, Swift-BAT refined analysis

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