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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"

32510 results found.

  1. GRB 080310: Magellan redshift revision
  2. GRB 080310: Lick/Kast Spectroscopy
  3. GRB080310: Super-LOTIS suggestion of brightening
  4. GRB 080310, SMARTS optical/IR afterglow observations
  5. GRB 080310: REM observations
  6. GRB080307, optical upper limit
  7. GRB080229, optical upper limit
  8. GRB 080307: Swift-XRT Team refined analysis
  9. GRB 080307: Swift/UVOT Upper Limits
  10. GRB 080307: Early RAPTOR Limits
  11. GRB 080307, Swift-BAT refined analysis
  12. GRB 080307: TNT optical observation
  13. GRB080307: Optical upper limits
  14. GRB 080307: Gemini-N i-band observations - candidate afterglow
  15. GRB 080307: BOAO imaging - retraction and new limit
  16. GRB 080307: retraction of UVOT candidate
  17. GRB 080307, Preliminary Swift-BAT refined analysis
  18. VLA possible radio detection of GRB 080229
  19. GRB 080303: Swift/UVOT follow-up of afterglow detection
  20. GRB 080303, Swift-BAT refined analysis
  21. GRB 080303: Rapid PROMPT Detections
  22. GRB080303: Swift XRT refined analysis
  23. Swift UVOT observations of GRB080229B
  24. GRB080229B: Swift XRT afterglow observation
  25. GRB 080303A: Faulkes Telescope South optical afterglow observations
  26. GRB 080303A: ROTSE-III Optical Limits
  27. GRB 080229: I-band observations from OSN
  28. GRB 080229: VLT NIR observations
  29. GRB080229: Swift XRT refined analysis
  30. GRB 080229: TNG NIR observations
  31. GRB 080229: Deep Gemini/GMOS optical observations
  32. GRB 080229: REM NIR observations
  33. GRB080229: Possible optical afterglow
  34. UVOT analysis for GRB080229
  35. GRB 080229, Swift-BAT refined analysis
  36. GRB 080229: Faulkes Telescope South optical limit
  37. GRB 080229A: ROTSE-III Optical Limits
  38. Early optical shallow decay in GRB 071112C
  39. GRB080207: optical observations
  40. GRB080205: optical observations
  41. GRB080211: optical observations
  42. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  43. GRB 071010B : Early optical brightening detected by TAOS
  44. Swift-XRT improved positions, and new redshift limits.
  45. ESO optical and NIR observations of GRB 080218B
  46. GRB 080204: Suzaku WAM observation of the prompt emission
  47. GRB 080218B, Swift-BAT refined analysis
  48. GRB 080218B: Swift-XRT refined analysis
  49. Swift/UVOT observations of GRB080218B
  50. GRB 080218B: REM NIR early upper limits
  51. GRB 080212: Mount Abu NIR observations
  52. GRB 080218B: GROND upper limits
  53. GRB 080218b, SMARTS optical/IR limits
  54. GRB 080218A, Swift-BAT refined analysis
  55. GRB080218B: Watcher prompt limit
  56. GRB 080211: Suzaku WAM observation of the prompt emission
  57. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  58. GRB 080212: VLT optical rapid decay
  59. GRB 080212: REM refined analysis
  60. Konus-Wind observation of GRB 080211
  61. VLA radio upper limit on GRB 080212
  62. Swift/UVOT refined analysis of GRB080212
  63. GRB 080212, Swift-BAT refined analysis
  64. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  65. GRB 080212: Gemini-South optical observations
  66. GRB 080212: GROND detects afterglow
  67. GRB 080212: REM NIR afterglow?
  68. GRB 080212: optical observations
  69. GRB 080212: Swift-XRT Team refined analysis
  70. GRB 080210: Keck photometry
  71. VLA non-detection of GRB 080210
  72. GRB 080207: VLT NIR early upper limits
  73. GRB 080210: Swift/UVOT Refined Analysis
  74. GRB 080207: optical observations.
  75. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy
  76. GRB 080210, Swift-BAT refined analysis
  77. GRB 080210: Super-LOTIS observations
  78. GRB 080210: Swift-XRT Refined Analysis
  79. GRB 080210: VLT redshift
  80. GRB 080210: Rapid PROMPT Detections
  81. GRB 080210: GOND detection in all bands and redshift upper limit
  82. GRB 080207: GROND upper limits
  83. GRB 080205: GAO 150cm telescope Optical limit
  84. GRB 080207, Swift-BAT refined analysis
  85. GRB 080207: Optical limits from Gemini-South
  86. GRB 080205: RTT150 optical observations
  87. Swift detection of AX J1749.1-2639
  88. GRB 080207: Super-LOTIS observations
  89. GRB 080207, Swift-BAT refined analysis
  90. GRB080207: RTT150 Optical Observations
  91. GRB 080207: REM NIR observations
  92. GRB080207: Swift/UVOT refined analysis
  93. GRB 080207: Swift-XRT Refined Analysis
  94. Konus-Wind observation of GRB 080204
  95. GRB 080205 optical upper limit
  96. GRB 080205: MASTER optical observation
  97. GRB 080205: optical observation
  98. VLA radio upper limit on GRB 080205
  99. INT+WFC R-band observations of GRB 080205
  100. GRB 080205, Swift-BAT refined analysis

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