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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"

31738 results found.

  1. GRB080315: Bok Optical Observations
  2. Swift/UVOT observations of GRB 080315
  3. Swift trigger 306323: Swift-BAT/XRT refined analysis
  4. GRB 080315: Optical observations
  5. GRB080310 : Lulin Optical observations
  6. GRB080310, unusual slow decay in the optical
  7. GRB 080310: GAO 150cm telescope Optical Observation
  8. GRB080310 : Optical observations by LOAO and Lulin
  9. GRB 080310: ROTSE-III Observations of Optical Counterpart
  10. GRB080310: Optical observation by MITSuME telescope
  11. GRB080310, optical observations with the LBT
  12. GRB 080307: GAO 150cm telescope Optical Observation
  13. GRB 080229A: GAO 150cm telescope Optical Observation
  14. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  15. GRB 080307: NIR upper limit
  16. GRB 080229: NIR upper limit
  17. GRB 080310: early RAPTOR multicolor observations
  18. GRB 080310, Swift-BAT refined analysis
  19. GRB080210: optical observations
  20. GRB080307: optical upper limit
  21. GRB 080310: Swift-XRT refined analysis
  22. GRB 080310: Swift/UVOT Refined Analysis
  23. GRB 080310: Redshift from Keck/DEIMOS Spectra
  24. GRB080310 : Lulin optical observation
  25. GRB 080310: RRM optical photometry with the VLT
  26. GRB080310, detection of break in optical
  27. GRB 080310: VLT/UVES spectroscopy
  28. GRB080310, optical observations with LBT
  29. GRB 080310: Magellan redshift revision
  30. GRB 080310: Lick/Kast Spectroscopy
  31. GRB080310: Super-LOTIS suggestion of brightening
  32. GRB 080310, SMARTS optical/IR afterglow observations
  33. GRB 080310: REM observations
  34. GRB080307, optical upper limit
  35. GRB080229, optical upper limit
  36. GRB 080307: Swift-XRT Team refined analysis
  37. GRB 080307: Swift/UVOT Upper Limits
  38. GRB 080307: Early RAPTOR Limits
  39. GRB 080307, Swift-BAT refined analysis
  40. GRB 080307: TNT optical observation
  41. GRB080307: Optical upper limits
  42. GRB 080307: Gemini-N i-band observations - candidate afterglow
  43. GRB 080307: BOAO imaging - retraction and new limit
  44. GRB 080307: retraction of UVOT candidate
  45. GRB 080307, Preliminary Swift-BAT refined analysis
  46. VLA possible radio detection of GRB 080229
  47. GRB 080303: Swift/UVOT follow-up of afterglow detection
  48. GRB 080303, Swift-BAT refined analysis
  49. GRB 080303: Rapid PROMPT Detections
  50. GRB080303: Swift XRT refined analysis
  51. Swift UVOT observations of GRB080229B
  52. GRB080229B: Swift XRT afterglow observation
  53. GRB 080303A: Faulkes Telescope South optical afterglow observations
  54. GRB 080303A: ROTSE-III Optical Limits
  55. GRB 080229: I-band observations from OSN
  56. GRB 080229: VLT NIR observations
  57. GRB080229: Swift XRT refined analysis
  58. GRB 080229: TNG NIR observations
  59. GRB 080229: Deep Gemini/GMOS optical observations
  60. GRB 080229: REM NIR observations
  61. GRB080229: Possible optical afterglow
  62. UVOT analysis for GRB080229
  63. GRB 080229, Swift-BAT refined analysis
  64. GRB 080229: Faulkes Telescope South optical limit
  65. GRB 080229A: ROTSE-III Optical Limits
  66. Early optical shallow decay in GRB 071112C
  67. GRB080207: optical observations
  68. GRB080205: optical observations
  69. GRB080211: optical observations
  70. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  71. GRB 071010B : Early optical brightening detected by TAOS
  72. Swift-XRT improved positions, and new redshift limits.
  73. ESO optical and NIR observations of GRB 080218B
  74. GRB 080204: Suzaku WAM observation of the prompt emission
  75. GRB 080218B, Swift-BAT refined analysis
  76. GRB 080218B: Swift-XRT refined analysis
  77. Swift/UVOT observations of GRB080218B
  78. GRB 080218B: REM NIR early upper limits
  79. GRB 080212: Mount Abu NIR observations
  80. GRB 080218B: GROND upper limits
  81. GRB 080218b, SMARTS optical/IR limits
  82. GRB 080218A, Swift-BAT refined analysis
  83. GRB080218B: Watcher prompt limit
  84. GRB 080211: Suzaku WAM observation of the prompt emission
  85. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  86. GRB 080212: VLT optical rapid decay
  87. GRB 080212: REM refined analysis
  88. Konus-Wind observation of GRB 080211
  89. VLA radio upper limit on GRB 080212
  90. Swift/UVOT refined analysis of GRB080212
  91. GRB 080212, Swift-BAT refined analysis
  92. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  93. GRB 080212: Gemini-South optical observations
  94. GRB 080212: GROND detects afterglow
  95. GRB 080212: REM NIR afterglow?
  96. GRB 080212: optical observations
  97. GRB 080212: Swift-XRT Team refined analysis
  98. GRB 080210: Keck photometry
  99. VLA non-detection of GRB 080210
  100. GRB 080207: VLT NIR early upper limits

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