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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"

44246 results found.

  1. VLT/UVES redshift of GRB 080319B
  2. GRB 080319C: Early Super-LOTIS Observations
  3. GRB 080319C: Swift detection of a burst with an optical afterglow
  4. GRB 080319C: KAIT OA candidate
  5. GRB 080319A: REM observations
  6. GRB 080319b prompt optical observation by Pi-of-the-Sky
  7. GRB 080319B: Change in power law decay index
  8. GRB 080319B: Gemini-South Spectroscopy
  9. GRB 080319A: optical observations at the NOT
  10. GRB0 080319B : LOAO optical observation
  11. GRB 080319b: Early IR Imaging from PAIRITEL
  12. GRB080319B Liverpool Telescope optical afterglow candidate
  13. GRB 080319B: Super-LOTIS Detection of a Bright OT
  14. GRB 080319B: REM observations
  15. GRB 080319B: KAIT OA
  16. GRB080319A: P60 Optical Afterglow Observations
  17. GRB 080319B: UVOT Position
  18. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  19. GRB 080319A: Swift detection of a burst
  20. Swift Trigger 306745 is not a GRB
  21. Swift Trigger 306616 is not a GRB
  22. GRB080310, LBT and MDM photometry
  23. GRB080315: Bok Optical Observations
  24. Swift/UVOT observations of GRB 080315
  25. Swift trigger 306323: Swift-BAT/XRT refined analysis
  26. SAX J1818.6-1703: Swift detection (trigger 306379)
  27. GRB 080315: Optical observations
  28. GRB 080315: TAROT Calern observatory optical observations
  29. GRB 080315: Swift detection of a possible burst
  30. GRB080310 : Lulin Optical observations
  31. GRB080310, unusual slow decay in the optical
  32. GRB 080310: GAO 150cm telescope Optical Observation
  33. GRB080310 : Optical observations by LOAO and Lulin
  34. GRB 080310: ROTSE-III Observations of Optical Counterpart
  35. GRB080310: Optical observation by MITSuME telescope
  36. GRB080310, optical observations with the LBT
  37. GRB 080307: GAO 150cm telescope Optical Observation
  38. GRB 080229A: GAO 150cm telescope Optical Observation
  39. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  40. GRB 080307: NIR upper limit
  41. GRB 080229: NIR upper limit
  42. GRB 080310: early RAPTOR multicolor observations
  43. GRB 080310, Swift-BAT refined analysis
  44. GRB080210: optical observations
  45. GRB080307: optical upper limit
  46. GRB 080310: Swift-XRT refined analysis
  47. GRB 080310: Swift/UVOT Refined Analysis
  48. GRB 080310: Redshift from Keck/DEIMOS Spectra
  49. GRB 080310 - SDSS Pre-Burst Observations
  50. GRB080310 : Lulin optical observation
  51. GRB 080310: Enhanced Swift-XRT position
  52. GRB 080310: RRM optical photometry with the VLT
  53. GRB080310, detection of break in optical
  54. GRB 080310: VLT/UVES spectroscopy
  55. GRB080310, optical observations with LBT
  56. GRB 080310: Magellan redshift revision
  57. GRB 080310: Lick/Kast Spectroscopy
  58. GRB080310: Super-LOTIS suggestion of brightening
  59. GRB 080310, SMARTS optical/IR afterglow observations
  60. GRB 080310: REM observations
  61. GRB 080310: Magellan redshift
  62. GRB 080310 afterglow candidate (correction to UT time)
  63. GRB 080310: Swift detection of a burst with optical afterglow
  64. GRB 080310 afterglow candidate
  65. GRB080229, optical upper limit (Correction)
  66. GRB080307, optical upper limit
  67. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  68. GRB080229, optical upper limit
  69. GRB 080307: Swift-XRT Team refined analysis
  70. GRB 080307: Swift/UVOT Upper Limits
  71. GRB 080307: Early RAPTOR Limits
  72. GRB 080307, Swift-BAT refined analysis
  73. GRB080307 - SDSS Pre-Burst Observations
  74. GRB 080307: TNT optical observation
  75. GRB080307: Optical upper limits
  76. GRB 080307: Gemini-N i-band observations - candidate afterglow
  77. GRB 080307: BOAO imaging - retraction and new limit
  78. GRB 080307: retraction of UVOT candidate
  79. GRB 080307: Enhanced Swift-XRT position
  80. GRB 080307, Preliminary Swift-BAT refined analysis
  81. GRB 080307 : BOAO optical afterglow observation
  82. GRB 080307: Optical observation with DMC/KANATA
  83. GRB 080307: Swift detection of a burst
  84. VLA possible radio detection of GRB 080229
  85. GRB 080303: Swift/UVOT follow-up of afterglow detection
  86. GRB 080303, Swift-BAT refined analysis
  87. GRB 080303: Rapid PROMPT Detections
  88. GRB080303: Swift XRT refined analysis
  89. GRB 080303: Enhanced Swift-XRT position
  90. Swift UVOT observations of GRB080229B
  91. GRB080229B: Swift XRT afterglow observation
  92. GRB 080303A: Faulkes Telescope South optical afterglow observations
  93. GRB 080303
  94. GRB 080303: Swift detection of a burst with optical afterglow
  95. GRB 080303: REM NIR afterglow candidate
  96. GRB 080303A: ROTSE-III Optical Limits
  97. GRB 080229: I-band observations from OSN
  98. GRB 080229: VLT NIR observations
  99. GRB080229: Swift XRT refined analysis
  100. GRB 080229: TNG NIR observations

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