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

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