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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"

26320 results found.

  1. GRB 080623: TAROT La Silla observatory optical observations
  2. GRB 080623: Swift XRT prompt analysis
  3. Swift trigger 314975 is not a GRB
  4. GRB080607: optical observation
  5. GRB 070809: Putative host galaxy and redshift
  6. VLA upper limit on INTEGRAL burst GRB 080613A
  7. GRB080613B: MITSuME upper limits
  8. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  9. GRB 080603A: optical observations on June 04
  10. GRB 080613A: Swift-XRT detection of the afterglow
  11. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  12. GRB 080613B: GROND Upper Limits
  13. GRB 080613B - NOT optical and IR nondetections
  14. GRB 080613B, Swift-BAT refined analysis
  15. GRB 080613B: Swift-XRT refined analysis
  16. GRB 080514B: Spectroscopic constraints and probable host galaxy
  17. GRB 080613B: Swift detection of a burst
  18. GRB 080613: Faulkes Telescope North optical candidate
  19. GRB 080613 : a long GRB detected with INTEGRAL
  20. GRB 080603A: Late-time Keck imaging and spectroscopy
  21. GRB 080603b: optical observation
  22. GRB 080603A: final Swift-XRT observations.
  23. GRB 080607: AGILE-MCAL observation of the prompt emission
  24. GRB 080603B - TLS 2nd Epoch: Another Break
  25. GRB 080605: TLS 3rd Epoch - Source Confusion
  26. GRB080605: optical observation with the MITSuME-OAO telescope
  27. GRB080607: RTT150 optical observations
  28. GRB 080603A: optical observations
  29. GRB 080607: Swift-XRT refined analysis
  30. Swift/UVOT Observations of GRB080607
  31. VLA detection of INTEGRAL burst GRB 080603A
  32. GRB 080607: Enhanced Swift-XRT position
  33. GRB 080607, Swift-BAT refined analysis
  34. GRB 080605: GROND 2nd epoch observations
  35. GRB 080607: Keck/LRIS spectroscopy and redshift
  36. GRB 080607: Swift detection of a burst with optical afterglow
  37. GRB 080607: ROTSE-III Detection of Optical Counterpart
  38. GRB 080605: Swift-UVOT refined analysis
  39. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  40. GRB 080604: VLA radio upper limit
  41. GRB 080605, Swift-BAT refined analysis
  42. GRB 080603B: VLA radio upper limit
  43. GRB 080605, Swift-BAT refined analysis
  44. GRB 080605: Swift-XRT refined analysis
  45. GRB 080605: MASTER VWF 46 s AT observation
  46. GRB 080605: Enhanced Swift-XRT position
  47. GRB 080605: GROND detection of the optical afterglow candidate
  48. GRB 080605: Liverpool Telescope optical afterglow candidate
  49. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  50. GRB 080605: Swift detection of a burst with an optical afterglow
  51. GRB 080603B: TLS Afterglow Observation
  52. GRB 080603A: TLS Afterglow Observation
  53. GRB 080604: MITSuME Okayama observation
  54. GRB 080604, Swift-BAT refined analysis
  55. GRB 080604: Swift-XRT refined analysis
  56. GRB 080603B : Liverpool Telescope Observations
  57. Konus-Wind observation of GRB 080603B
  58. GRB 080603B: Swift-XRT refined analysis
  59. GRB 080603A: Swift-XRT detection of the afterglow
  60. GRB 080430: optical observations
  61. GRB 080603B: Swift/UVOT detection of the afterglow
  62. GRB 080604: Enhanced Swift-XRT position
  63. GRB 080603B, Swift-BAT refined analysis
  64. GRB080603B: RTT150 optical observations, break in light curves
  65. GRB 080604: Swift detection of a burst with an optical afterglow
  66. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  67. GRB 080516: TAROT La Silla observatory optical observations
  68. GRB080603B: NOT redshift
  69. GRB 080603B: BOOTES2/TELMA optical observations
  70. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  71. GRB 080603B: Swift detection of a burst with optical afterglow
  72. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  73. GRB 080603: A long GRB detected by INTEGRAL
  74. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  75. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  76. GRB 080602, Swift-BAT refined analysis
  77. GRB 080602: Swift-XRT refined analysis
  78. Konus-Wind observation of GRB 080602
  79. GRB 080602: NOT R-band upper limit
  80. GRB 080602: Enhanced Swift-XRT position
  81. GRB 080602: Swift detection of a burst
  82. Swift analysis of BAT Slew Survey event (Trigger=009)
  83. GRB 080523: afterglow confirmation and redshift constraints
  84. Konus-Wind observation of reactivation of SGR 1627-41
  85. GRB 080524: Swift XRT and UVOT analysis
  86. GRB 080503: 2nd Epoch Chandra X-ray Observations
  87. GRB 080524: Swift-BAT detection of a burst in ground analysis
  88. GRB 080523: Swift-XRT refined analysis
  89. GRB 080523, Swift-BAT refined analysis
  90. GRB 080523: VLT optical observations
  91. GRB 080523: Enhanced Swift-XRT position
  92. GRB 080523: Swift detection of a burst
  93. GRB 080515: KPNO 4m NIR afterglow detection
  94. GRB 80516: Swift/UVOT Observations
  95. GRB 080515: Swift-XRT position and analysis
  96. GRB 080520, Swift-BAT refined analysis
  97. GRB 080514B: UVOT Observations
  98. GRB080520: Swift/UVOT observations
  99. GRB 080520, GROND observations
  100. GRB 080520: Enhanced Swift-XRT position

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