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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"

21456 results found.

  1. GRB 080319A: Swift-XRT Team Refined Analysis
  2. GRB 080319B, Swift-BAT refined analysis
  3. GRB 080319C: Swift-XRT Team Refined Analysis
  4. GRB 080319B: Swift-XRT Team Refined Analysis
  5. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  6. GRB 080319C: AGILE-MCAL observation of the prompt emission
  7. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  8. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  9. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  10. GRB 080319B: TORTORA synchronous observation
  11. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  12. GRB 080319B: Enhanced Swift-XRT position
  13. GRB 080319A: Enhanced Swift-XRT position
  14. GRB 080319A, Swift-BAT refined analysis
  15. GRB 080319C: Early Super-LOTIS Observations
  16. GRB 080319C: Swift detection of a burst with an optical afterglow
  17. GRB 080319C: KAIT OA candidate
  18. GRB 080319b prompt optical observation by Pi-of-the-Sky
  19. GRB 080319B: Gemini-South Spectroscopy
  20. GRB080319B Liverpool Telescope optical afterglow candidate
  21. GRB 080319B: Super-LOTIS Detection of a Bright OT
  22. GRB 080319B: KAIT OA
  23. GRB080319A: P60 Optical Afterglow Observations
  24. GRB 080319B: UVOT Position
  25. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  26. GRB 080319A: Swift detection of a burst
  27. Swift Trigger 306745 is not a GRB
  28. Swift Trigger 306616 is not a GRB
  29. GRB080315: Bok Optical Observations
  30. Swift/UVOT observations of GRB 080315
  31. Swift trigger 306323: Swift-BAT/XRT refined analysis
  32. SAX J1818.6-1703: Swift detection (trigger 306379)
  33. GRB 080315: TAROT Calern observatory optical observations
  34. GRB 080315: Swift detection of a possible burst
  35. GRB 080310: ROTSE-III Observations of Optical Counterpart
  36. GRB080310: Optical observation by MITSuME telescope
  37. GRB 080229A: GAO 150cm telescope Optical Observation
  38. GRB 080307: NIR upper limit
  39. GRB 080229: NIR upper limit
  40. GRB 080310, Swift-BAT refined analysis
  41. GRB080307: optical upper limit
  42. GRB 080310: Swift-XRT refined analysis
  43. GRB 080310: Swift/UVOT Refined Analysis
  44. GRB 080310 - SDSS Pre-Burst Observations
  45. GRB 080310: Enhanced Swift-XRT position
  46. GRB 080310: VLT/UVES spectroscopy
  47. GRB080310: Super-LOTIS suggestion of brightening
  48. GRB 080310: Swift detection of a burst with optical afterglow
  49. GRB080229, optical upper limit (Correction)
  50. GRB080307, optical upper limit
  51. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  52. GRB080229, optical upper limit
  53. GRB 080307: Swift-XRT Team refined analysis
  54. GRB 080307: Swift/UVOT Upper Limits
  55. GRB 080307: Early RAPTOR Limits
  56. GRB 080307, Swift-BAT refined analysis
  57. GRB080307 - SDSS Pre-Burst Observations
  58. GRB080307: Optical upper limits
  59. GRB 080307: Gemini-N i-band observations - candidate afterglow
  60. GRB 080307: BOAO imaging - retraction and new limit
  61. GRB 080307: retraction of UVOT candidate
  62. GRB 080307: Enhanced Swift-XRT position
  63. GRB 080307, Preliminary Swift-BAT refined analysis
  64. GRB 080307: Swift detection of a burst
  65. VLA possible radio detection of GRB 080229
  66. GRB 080303: Swift/UVOT follow-up of afterglow detection
  67. GRB 080303, Swift-BAT refined analysis
  68. GRB080303: Swift XRT refined analysis
  69. GRB 080303: Enhanced Swift-XRT position
  70. Swift UVOT observations of GRB080229B
  71. GRB080229B: Swift XRT afterglow observation
  72. GRB 080303A: Faulkes Telescope South optical afterglow observations
  73. GRB 080303
  74. GRB 080303: Swift detection of a burst with optical afterglow
  75. GRB 080303: REM NIR afterglow candidate
  76. GRB 080303A: ROTSE-III Optical Limits
  77. GRB 080229: I-band observations from OSN
  78. GRB 080229: VLT NIR observations
  79. GRB080229: Swift XRT refined analysis
  80. GRB 080229: TNG NIR observations
  81. GRB 080229: Deep Gemini/GMOS optical observations
  82. GRB 080229: Enhanced Swift-XRT position
  83. GRB 080229: REM NIR observations
  84. GRB080229: Possible optical afterglow
  85. UVOT analysis for GRB080229
  86. GRB 080229, Swift-BAT refined analysis
  87. GRB 080229: Faulkes Telescope South optical limit
  88. GRB 080229A: ROTSE-III Optical Limits
  89. GRB 080229: Swift detection of a bright burst
  90. GRB080207: optical observations
  91. GRB080211: optical observations
  92. Swift-XRT improved positions, and new redshift limits.
  93. ESO optical and NIR observations of GRB 080218B
  94. GRB 080204: Suzaku WAM observation of the prompt emission
  95. GRB 080218B, Swift-BAT refined analysis
  96. GRB 080218B: Swift-XRT refined analysis
  97. Swift/UVOT observations of GRB080218B
  98. GRB 080218B: REM NIR early upper limits
  99. GRB 080218B: Enhanced Swift-XRT position
  100. GRB 080218B: GROND upper limits

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