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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"

995 results found.

  1. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  2. GRB 100925A / MAXI J1659-152: SARA-S Observations
  3. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  4. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  5. GRB 100925A/MAXI J1659-152 - NOT optical observations
  6. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  7. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  8. GRB 100823A: MAXI/GSC detection
  9. GRB 100713A: optical upper limit
  10. XRF 100701A : MAXI/GSC detection of a probable XRF
  11. XRF 100616a : MAXI/GSC detection of a probable XRF
  12. GRB 100510A: Fermi GBM detection/observation
  13. GRB 100510A: MAXI/GSC detection
  14. GRB100508A: Further Swift/UVOT Observations
  15. GRB100508A: Swift/UVOT Detection of the Afterglow
  16. GRB 100415A: MAXI/GSC detection of a probable GRB
  17. Short X-ray Transient detected by MAXI/GSC
  18. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  19. Short X-ray Transient detected by MAXI/GSC
  20. Short X-ray Transient, RIMOTS optical upper limits
  21. Short X-ray Transient Detection by MAXI/GSC
  22. IPN Triangulation of GRB091120
  23. Konus-Wind observation of GRB 091120
  24. GRB 091120: MAXI GSC detection
  25. GRB 090926B: MAXI GSC detection
  26. GRB 090831A: Suzaku WAM observation of the prompt emission
  27. GRB 090831A: IPN Triangulation
  28. GRB 090831: MAXI GSC detection
  29. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  30. IPN Triangulation and Konus-Wind observaions of GRB090727B
  31. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  32. GRB 081130B: Fermi GBM detection
  33. GRB 080723A: optical upper limit
  34. GRB 080702A: optical upper limit
  35. GRB 080325: optical upper limit
  36. GRB 080319B: optical upper limit
  37. GRB 080319D: optical upper limit
  38. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  39. GRB 080205: optical observation
  40. GRB071118: Swift XRT refined analysis
  41. GRB 071112C: optical observation
  42. GRB 070612B: optical observations
  43. GRB 070520A: Swift UVOT Upper Limits
  44. GRB 070311: Optical observation.
  45. GRB 070125: optical observation
  46. GRB 070125: optical observations
  47. GRB061202: FRAM early follow-up limit
  48. GRB 061027, Swift refined analysis of a possible burst
  49. GRB060929: Optical limit
  50. GRB 060927 optical limit
  51. GRB060906 , optical observation
  52. GRB 060906: Swift-UVOT observations
  53. GRB 060906: Swift detection of a probable burst
  54. GRB060904b, optical observations
  55. GRB 060814: Suzaku/WAM observation of the prompt emission
  56. GRB060526, optical observations
  57. GRB060526, optical observations
  58. GRB 060502B: optical observations
  59. GRB060403: Optical Limit
  60. GRB060218, optical observations
  61. GRB 060218: Swift-BAT detection of a possible burst
  62. GRB060206, optical observations
  63. GRB060124 optical observations
  64. GRB 060111: TAROT optical observation
  65. Konus-Wind observation of GRB 051221A
  66. GRB051111: Rc optical observations
  67. GRB050805A: Rc optical observations
  68. GRB 050401: Rc observation
  69. GRB 050416b: Tentative Swift XRT Position
  70. GRB050319, optical observations
  71. GRB 041218: optical observations
  72. GRB041218: optical observations
  73. GRB 041006 R observations in Loiano
  74. GRB040825A: optical observations
  75. GRB040825B: optical observations
  76. GRB040624, optical observations
  77. IPN Summary of SGR1806-20 Activity in 2004
  78. GRB040422, optical observations at Loiano
  79. GRB030418: R optical observations
  80. GRB030329: R and B observations
  81. GRB030328: R optical observation
  82. GRB030329 optical observations
  83. GRB030324, optical observations
  84. GRB030226, addendum to GCN 1892
  85. GRB030226: optical observation
  86. GRB030217: optical observations
  87. GRB020819: optical observations
  88. GRB020812: optical observations
  89. GRB020317: optical observations
  90. GRB 010222 BV optical observations
  91. GRB000620 Optical observations
  92. GRB000616 optical observations
  93. GRB000301C, optical R-band observations
  94. GRB000301C
  95. ASM/IPN error box for GRB 990308 (BATSE #7457)

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