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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"

19538 results found.

  1. GRB 080319B: UVOT Position
  2. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  3. GRB 080319A: Swift detection of a burst
  4. Swift Trigger 306745 is not a GRB
  5. Swift Trigger 306616 is not a GRB
  6. Swift/UVOT observations of GRB 080315
  7. Swift trigger 306323: Swift-BAT/XRT refined analysis
  8. SAX J1818.6-1703: Swift detection (trigger 306379)
  9. GRB 080315: TAROT Calern observatory optical observations
  10. GRB 080315: Swift detection of a possible burst
  11. GRB 080310: ROTSE-III Observations of Optical Counterpart
  12. GRB 080310, Swift-BAT refined analysis
  13. GRB 080310: Swift-XRT refined analysis
  14. GRB 080310: Swift/UVOT Refined Analysis
  15. GRB 080310 - SDSS Pre-Burst Observations
  16. GRB 080310: Enhanced Swift-XRT position
  17. GRB 080310: VLT/UVES spectroscopy
  18. GRB080310: Super-LOTIS suggestion of brightening
  19. GRB 080310: Swift detection of a burst with optical afterglow
  20. GRB080229, optical upper limit (Correction)
  21. GRB080307, optical upper limit
  22. GRB080229, optical upper limit
  23. GRB 080307: Swift-XRT Team refined analysis
  24. GRB 080307: Swift/UVOT Upper Limits
  25. GRB 080307: Early RAPTOR Limits
  26. GRB 080307, Swift-BAT refined analysis
  27. GRB080307 - SDSS Pre-Burst Observations
  28. GRB 080307: retraction of UVOT candidate
  29. GRB 080307: Enhanced Swift-XRT position
  30. GRB 080307, Preliminary Swift-BAT refined analysis
  31. GRB 080307: Swift detection of a burst
  32. VLA possible radio detection of GRB 080229
  33. GRB 080303: Swift/UVOT follow-up of afterglow detection
  34. GRB 080303, Swift-BAT refined analysis
  35. GRB080303: Swift XRT refined analysis
  36. GRB 080303: Enhanced Swift-XRT position
  37. Swift UVOT observations of GRB080229B
  38. GRB080229B: Swift XRT afterglow observation
  39. GRB 080303A: Faulkes Telescope South optical afterglow observations
  40. GRB 080303: Swift detection of a burst with optical afterglow
  41. GRB 080303A: ROTSE-III Optical Limits
  42. GRB 080229: I-band observations from OSN
  43. GRB080229: Swift XRT refined analysis
  44. GRB 080229: Enhanced Swift-XRT position
  45. UVOT analysis for GRB080229
  46. GRB 080229, Swift-BAT refined analysis
  47. GRB 080229: Faulkes Telescope South optical limit
  48. GRB 080229A: ROTSE-III Optical Limits
  49. GRB 080229: Swift detection of a bright burst
  50. Swift-XRT improved positions, and new redshift limits.
  51. ESO optical and NIR observations of GRB 080218B
  52. GRB 080204: Suzaku WAM observation of the prompt emission
  53. GRB 080218B, Swift-BAT refined analysis
  54. GRB 080218B: Swift-XRT refined analysis
  55. Swift/UVOT observations of GRB080218B
  56. GRB 080218B: Enhanced Swift-XRT position
  57. GRB 080218B: GROND upper limits
  58. GRB 080218A, Swift-BAT refined analysis
  59. GRB080218B: Watcher prompt limit
  60. GRB 080218B: Swift detection of a burst
  61. GRB 080218: Swift detection of a burst
  62. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  63. VLA radio upper limit on GRB 080212
  64. Swift/UVOT refined analysis of GRB080212
  65. GRB 080212, Swift-BAT refined analysis
  66. GRB 080212: GROND detects afterglow
  67. GRB 080212: optical observations
  68. GRB 080212: Enhanced Swift-XRT position
  69. GRB 080212: Swift-XRT Team refined analysis
  70. GRB 080210: Keck photometry
  71. VLA non-detection of GRB 080210
  72. GRB 080212: Swift detection of a burst
  73. GRB 080210: Swift/UVOT Refined Analysis
  74. GRB 080210, Swift-BAT refined analysis
  75. GRB 080210: Super-LOTIS observations
  76. GRB 080210: Swift-XRT Refined Analysis
  77. GRB 080210: Enhanced Swift-XRT position
  78. GRB 080210: GOND detection in all bands and redshift upper limit
  79. GRB080210 - SDSS Pre-Burst Observations
  80. GRB 080210: Swift detection of a burst with optical afterglow
  81. GRB 080210: TAROT La Silla observatory optical detection
  82. GRB 080207: GROND upper limits
  83. GRB 080207, Swift-BAT refined analysis
  84. Swift detection of AX J1749.1-2639
  85. GRB 080207, Swift-BAT refined analysis
  86. Swift Trigger 302777 is not a GRB
  87. GRB080207: Swift/UVOT refined analysis
  88. GRB 080207: TAROT Calern observatory optical observations
  89. GRB 080207: Swift-XRT Refined Analysis
  90. GRB 080207: Enhanced Swift-XRT position
  91. GRB 080207: Swift detection of a burst
  92. GRB 080205 optical upper limit
  93. VLA radio upper limit on GRB 080205
  94. GRB 080205, Swift-BAT refined analysis
  95. IPN localization of very hard GRB 080204
  96. GRB 080205: Swift XRT refined analysis
  97. GRB 080205: OA evolution from KAIT observations
  98. GRB 080205: Swift/UVOT observations
  99. GRB 080205: Enhanced Swift-XRT position
  100. GRB 080205: KAIT OA detection

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