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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"

32509 results found.

  1. GRB 070809: Putative host galaxy and redshift
  2. VLA upper limit on INTEGRAL burst GRB 080613A
  3. GRB 0800603A: optical observation
  4. GRB080613B: MITSuME upper limits
  5. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  6. Konus-Wind observation of GRB 080613B
  7. GRB 080603A: optical observations on June 04
  8. GRB 080613A: Swift-XRT detection of the afterglow
  9. GRB080613A: Swift/UVOT Upper Limits
  10. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  11. GRB 080613B: GROND Upper Limits
  12. GRB 080613B - NOT optical and IR nondetections
  13. GRB080613B: Swift/UVOT Upper Limits
  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 080613: Faulkes Telescope North optical candidate
  18. GRB 080603A: Late-time Keck imaging and spectroscopy
  19. GRB 080603b: optical observation
  20. Swift observations of BAT Slew Survey event (Trigger=010)
  21. GRB 080603A: final Swift-XRT observations.
  22. GRB 080607: AGILE-MCAL observation of the prompt emission
  23. GRB 080603B - TLS 2nd Epoch: Another Break
  24. GRB 080605: TLS 3rd Epoch - Source Confusion
  25. GRB080605: optical observation with the MITSuME-OAO telescope
  26. Konus-Wind observation of GRB 080607
  27. GRB080607: RTT150 optical observations
  28. GRB 080603A: optical observations
  29. GRB 080607: Swift-XRT refined analysis
  30. Swift/UVOT Observations of GRB080607
  31. GRB 080605: optical observations
  32. GRB 080607 KAIT observations
  33. VLA detection of INTEGRAL burst GRB 080603A
  34. Konus-Wind observation of GRB 080605
  35. GRB 080607, Swift-BAT refined analysis
  36. GRB 080605: GROND 2nd epoch observations
  37. GRB 080607 - PAIRITEL NIR detection
  38. GRB 080607: Keck/LRIS spectroscopy and redshift
  39. GRB 080607: Super-LOTIS early observations
  40. GRB 080607: ROTSE-III Detection of Optical Counterpart
  41. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  42. GRB 080605: Swift-UVOT refined analysis
  43. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  44. GRB 080604: VLA radio upper limit
  45. GRB 080605, Swift-BAT refined analysis
  46. GRB 080603B: VLA radio upper limit
  47. GRB 080605, Swift-BAT refined analysis
  48. GRB 080605: Swift-XRT refined analysis
  49. GRB080605: observation by BOOTES
  50. GRB 080605: MASTER VWF 46 s AT observation
  51. GRB 080605: GROND detection of the optical afterglow candidate
  52. GRB080605: optical observations
  53. GRB 080605: VLT redshift
  54. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  55. GRB 080605: TLS RRM Afterglow
  56. GRB 080603B: PAIRITEL infrared detection
  57. GRB 080603A: PAIRITEL infrared detection
  58. GRB 080604: Xinglong R band observation
  59. GRB 080603A: Xinglong R band observation
  60. GRB 080603B: TLS Afterglow Observation
  61. GRB 080603A: TLS Afterglow Observation
  62. Swift/UVOT observations of GRB080604
  63. GRB080604: HET redshift retraction
  64. GRB 080604: Gemini-North spectroscopy
  65. GRB 080604, Swift-BAT refined analysis
  66. GRB 080604: Swift-XRT refined analysis
  67. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  68. GRB 080603B : Xinglong EST observations
  69. GRB 080603B : Liverpool Telescope Observations
  70. Konus-Wind observation of GRB 080603B
  71. GRB 080603B: Swift-XRT refined analysis
  72. GRB 080603A: Swift-XRT detection of the afterglow
  73. GRB 080430: optical observations
  74. GRB 080603B: Swift/UVOT detection of the afterglow
  75. GRB 080603B, Swift-BAT refined analysis
  76. GRB 080604: Hobby-Eberly Telescope spectroscopy
  77. GRB 080603A: Swift/UVOT detection of the afterglow
  78. GRB080603B: RTT150 optical observations, break in light curves
  79. GRB 080604: Early Super-LOTIS Observations
  80. GRB080604: confirmation of optical afterglow
  81. GRB080603B: NOT redshift
  82. GRB 080603B: BOOTES2/TELMA optical observations
  83. GRB080603: Super-LOTIS detection of Optical Counterpart
  84. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  85. GRB 080603: Gemini-North redshift
  86. GRB 080602, Swift-BAT refined analysis
  87. GRB 080602: Swift-XRT refined analysis
  88. Konus-Wind observation of GRB 080602
  89. GRB 080602: NOT R-band upper limit
  90. Swift analysis of BAT Slew Survey event (Trigger=009)
  91. GRB 080523: afterglow confirmation and redshift constraints
  92. Konus-Wind observation of reactivation of SGR 1627-41
  93. Reactivation of SGR 1627-41
  94. GRB 080524: Swift XRT and UVOT analysis
  95. GRB 080503: 2nd Epoch Chandra X-ray Observations
  96. GRB 080523: Swift-XRT refined analysis
  97. GRB 080523, Swift-BAT refined analysis
  98. GRB 080520: VLT host detection
  99. GRB 080523: VLT optical observations
  100. Swift/UVOT observations of GRB 080523

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