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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').

18344 results found.

  1. GRB 080319C: Swift detection of a burst with an optical afterglow
  2. GRB 080319C: KAIT OA candidate
  3. GRB 080319b prompt optical observation by Pi-of-the-Sky
  4. GRB 080319B: Gemini-South Spectroscopy
  5. GRB080319B Liverpool Telescope optical afterglow candidate
  6. GRB 080319B: Super-LOTIS Detection of a Bright OT
  7. GRB 080319B: KAIT OA
  8. GRB 080319B: UVOT Position
  9. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  10. GRB 080319A: Swift detection of a burst
  11. Swift Trigger 306745 is not a GRB
  12. Swift Trigger 306616 is not a GRB
  13. Swift/UVOT observations of GRB 080315
  14. Swift trigger 306323: Swift-BAT/XRT refined analysis
  15. SAX J1818.6-1703: Swift detection (trigger 306379)
  16. GRB 080315: TAROT Calern observatory optical observations
  17. GRB 080315: Swift detection of a possible burst
  18. GRB 080310: ROTSE-III Observations of Optical Counterpart
  19. GRB 080310, Swift-BAT refined analysis
  20. GRB 080310: Swift-XRT refined analysis
  21. GRB 080310: Swift/UVOT Refined Analysis
  22. GRB 080310 - SDSS Pre-Burst Observations
  23. GRB 080310: Enhanced Swift-XRT position
  24. GRB 080310: VLT/UVES spectroscopy
  25. GRB080310: Super-LOTIS suggestion of brightening
  26. GRB 080310: Swift detection of a burst with optical afterglow
  27. GRB080229, optical upper limit (Correction)
  28. GRB080307, optical upper limit
  29. GRB080229, optical upper limit
  30. GRB 080307: Swift-XRT Team refined analysis
  31. GRB 080307: Swift/UVOT Upper Limits
  32. GRB 080307: Early RAPTOR Limits
  33. GRB 080307, Swift-BAT refined analysis
  34. GRB080307 - SDSS Pre-Burst Observations
  35. GRB 080307: retraction of UVOT candidate
  36. GRB 080307: Enhanced Swift-XRT position
  37. GRB 080307, Preliminary Swift-BAT refined analysis
  38. GRB 080307: Swift detection of a burst
  39. VLA possible radio detection of GRB 080229
  40. GRB 080303: Swift/UVOT follow-up of afterglow detection
  41. GRB 080303, Swift-BAT refined analysis
  42. GRB080303: Swift XRT refined analysis
  43. GRB 080303: Enhanced Swift-XRT position
  44. Swift UVOT observations of GRB080229B
  45. GRB080229B: Swift XRT afterglow observation
  46. GRB 080303A: Faulkes Telescope South optical afterglow observations
  47. GRB 080303: Swift detection of a burst with optical afterglow
  48. GRB 080303A: ROTSE-III Optical Limits
  49. GRB 080229: I-band observations from OSN
  50. GRB080229: Swift XRT refined analysis
  51. GRB 080229: Enhanced Swift-XRT position
  52. UVOT analysis for GRB080229
  53. GRB 080229, Swift-BAT refined analysis
  54. GRB 080229: Faulkes Telescope South optical limit
  55. GRB 080229A: ROTSE-III Optical Limits
  56. GRB 080229: Swift detection of a bright burst
  57. Swift-XRT improved positions, and new redshift limits.
  58. ESO optical and NIR observations of GRB 080218B
  59. GRB 080204: Suzaku WAM observation of the prompt emission
  60. GRB 080218B, Swift-BAT refined analysis
  61. GRB 080218B: Swift-XRT refined analysis
  62. Swift/UVOT observations of GRB080218B
  63. GRB 080218B: Enhanced Swift-XRT position
  64. GRB 080218B: GROND upper limits
  65. GRB 080218A, Swift-BAT refined analysis
  66. GRB080218B: Watcher prompt limit
  67. GRB 080218B: Swift detection of a burst
  68. GRB 080218: Swift detection of a burst
  69. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  70. VLA radio upper limit on GRB 080212
  71. Swift/UVOT refined analysis of GRB080212
  72. GRB 080212, Swift-BAT refined analysis
  73. GRB 080212: GROND detects afterglow
  74. GRB 080212: optical observations
  75. GRB 080212: Enhanced Swift-XRT position
  76. GRB 080212: Swift-XRT Team refined analysis
  77. GRB 080210: Keck photometry
  78. VLA non-detection of GRB 080210
  79. GRB 080212: Swift detection of a burst
  80. GRB 080210: Swift/UVOT Refined Analysis
  81. GRB 080210, Swift-BAT refined analysis
  82. GRB 080210: Super-LOTIS observations
  83. GRB 080210: Swift-XRT Refined Analysis
  84. GRB 080210: Enhanced Swift-XRT position
  85. GRB 080210: GOND detection in all bands and redshift upper limit
  86. GRB080210 - SDSS Pre-Burst Observations
  87. GRB 080210: Swift detection of a burst with optical afterglow
  88. GRB 080210: TAROT La Silla observatory optical detection
  89. GRB 080207: GROND upper limits
  90. GRB 080207, Swift-BAT refined analysis
  91. Swift detection of AX J1749.1-2639
  92. GRB 080207, Swift-BAT refined analysis
  93. Swift Trigger 302777 is not a GRB
  94. GRB080207: Swift/UVOT refined analysis
  95. GRB 080207: TAROT Calern observatory optical observations
  96. GRB 080207: Swift-XRT Refined Analysis
  97. GRB 080207: Enhanced Swift-XRT position
  98. GRB 080207: Swift detection of a burst
  99. GRB 080205 optical upper limit
  100. VLA radio upper limit on GRB 080205

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