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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"

31730 results found.

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

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