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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"

44618 results found.

  1. GRB080319A: P60 Optical Afterglow Observations
  2. GRB 080319B: UVOT Position
  3. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  4. GRB 080319A: Swift detection of a burst
  5. Swift Trigger 306745 is not a GRB
  6. Swift Trigger 306616 is not a GRB
  7. GRB080310, LBT and MDM photometry
  8. GRB080315: Bok Optical Observations
  9. Swift/UVOT observations of GRB 080315
  10. Swift trigger 306323: Swift-BAT/XRT refined analysis
  11. SAX J1818.6-1703: Swift detection (trigger 306379)
  12. GRB 080315: Optical observations
  13. GRB 080315: TAROT Calern observatory optical observations
  14. GRB 080315: Swift detection of a possible burst
  15. GRB080310 : Lulin Optical observations
  16. GRB080310, unusual slow decay in the optical
  17. GRB 080310: GAO 150cm telescope Optical Observation
  18. GRB080310 : Optical observations by LOAO and Lulin
  19. GRB 080310: ROTSE-III Observations of Optical Counterpart
  20. GRB080310: Optical observation by MITSuME telescope
  21. GRB080310, optical observations with the LBT
  22. GRB 080307: GAO 150cm telescope Optical Observation
  23. GRB 080229A: GAO 150cm telescope Optical Observation
  24. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  25. GRB 080307: NIR upper limit
  26. GRB 080229: NIR upper limit
  27. GRB 080310: early RAPTOR multicolor observations
  28. GRB 080310, Swift-BAT refined analysis
  29. GRB080210: optical observations
  30. GRB080307: optical upper limit
  31. GRB 080310: Swift-XRT refined analysis
  32. GRB 080310: Swift/UVOT Refined Analysis
  33. GRB 080310: Redshift from Keck/DEIMOS Spectra
  34. GRB 080310 - SDSS Pre-Burst Observations
  35. GRB080310 : Lulin optical observation
  36. GRB 080310: Enhanced Swift-XRT position
  37. GRB 080310: RRM optical photometry with the VLT
  38. GRB080310, detection of break in optical
  39. GRB 080310: VLT/UVES spectroscopy
  40. GRB080310, optical observations with LBT
  41. GRB 080310: Magellan redshift revision
  42. GRB 080310: Lick/Kast Spectroscopy
  43. GRB080310: Super-LOTIS suggestion of brightening
  44. GRB 080310, SMARTS optical/IR afterglow observations
  45. GRB 080310: REM observations
  46. GRB 080310: Magellan redshift
  47. GRB 080310 afterglow candidate (correction to UT time)
  48. GRB 080310: Swift detection of a burst with optical afterglow
  49. GRB 080310 afterglow candidate
  50. GRB080229, optical upper limit (Correction)
  51. GRB080307, optical upper limit
  52. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  53. GRB080229, optical upper limit
  54. GRB 080307: Swift-XRT Team refined analysis
  55. GRB 080307: Swift/UVOT Upper Limits
  56. GRB 080307: Early RAPTOR Limits
  57. GRB 080307, Swift-BAT refined analysis
  58. GRB080307 - SDSS Pre-Burst Observations
  59. GRB 080307: TNT optical observation
  60. GRB080307: Optical upper limits
  61. GRB 080307: Gemini-N i-band observations - candidate afterglow
  62. GRB 080307: BOAO imaging - retraction and new limit
  63. GRB 080307: retraction of UVOT candidate
  64. GRB 080307: Enhanced Swift-XRT position
  65. GRB 080307, Preliminary Swift-BAT refined analysis
  66. GRB 080307 : BOAO optical afterglow observation
  67. GRB 080307: Optical observation with DMC/KANATA
  68. GRB 080307: Swift detection of a burst
  69. VLA possible radio detection of GRB 080229
  70. GRB 080303: Swift/UVOT follow-up of afterglow detection
  71. GRB 080303, Swift-BAT refined analysis
  72. GRB 080303: Rapid PROMPT Detections
  73. GRB080303: Swift XRT refined analysis
  74. GRB 080303: Enhanced Swift-XRT position
  75. Swift UVOT observations of GRB080229B
  76. GRB080229B: Swift XRT afterglow observation
  77. GRB 080303A: Faulkes Telescope South optical afterglow observations
  78. GRB 080303
  79. GRB 080303: Swift detection of a burst with optical afterglow
  80. GRB 080303: REM NIR afterglow candidate
  81. GRB 080303A: ROTSE-III Optical Limits
  82. GRB 080229: I-band observations from OSN
  83. GRB 080229: VLT NIR observations
  84. GRB080229: Swift XRT refined analysis
  85. GRB 080229: TNG NIR observations
  86. GRB 080229: Deep Gemini/GMOS optical observations
  87. GRB 080229: Enhanced Swift-XRT position
  88. GRB 080229: REM NIR observations
  89. GRB080229: Possible optical afterglow
  90. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  91. UVOT analysis for GRB080229
  92. GRB 080229, Swift-BAT refined analysis
  93. GRB 080229: Faulkes Telescope South optical limit
  94. GRB 080229A: ROTSE-III Optical Limits
  95. GRB 080229: Swift detection of a bright burst
  96. Early optical shallow decay in GRB 071112C
  97. GRB080207: optical observations
  98. GRB080205: optical observations
  99. GRB080211: optical observations
  100. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz

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