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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"

11504 results found.

  1. GRB 061121, Swift-BAT refined analysis
  2. GRB 061121: Faulkes Telescope North Optical Observation
  3. GRB 060111B: Swift UVOT Refined Magnitudes
  4. GRB061110B: Optical observations at Crni Vrh
  5. GRB 061110B: NOT optical observations
  6. GRB 061110: ROTSE-III Optical Limits
  7. GRB061019: second epoch CrAO observations
  8. GRB061102B: Super-LOTIS observations
  9. GRB 061028: Optical R passband observations
  10. GRB 061028: z band imaging
  11. GRB 061027, Swift refined analysis of a possible burst
  12. GRB061025: Swift XRT refined analysis
  13. GRB 061025: Gemini-S observations
  14. GRB061025: Swift XRT position
  15. GRB 061025: ROTSE-III Optical Limits
  16. GRB 061025: a long GRB detected by INTEGRAL
  17. Konus-Wind observation of GRB 061021
  18. GRB 061021: Swift-XRT refined analysis
  19. GRB 061021: Swift detection of a burst
  20. GRB061019: optical observations
  21. GRB 061019: SARA upper limit
  22. GRB 060930: MARGE Optical Limits
  23. GRB 061019, Swift-BAT refined analysis
  24. GRB 061019: Swift-BAT detection of a burst
  25. GRB 061007: RHESSI Spectral Fit
  26. Konus-Wind observation of GRB 061007
  27. Konus-Wind observation of the short hard GRB 061006
  28. Konus-Wind observation of GRB 060928
  29. GRB 060928: RHESSI Spectral Fit
  30. GRB 060930: near-IR afterglow candidate
  31. GRB 061002, Swift-BAT refined analysis
  32. GRB061002: MASTER-VWF-Kislovodsk observations
  33. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  34. GRB 061002: Swift detection of a burst
  35. GRB 060807: Detection of a possible host galaxy
  36. GRB060930: Faulkes Telescope South observation
  37. GRB 060930: ROTSE-III Optical Limits
  38. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  39. GRB 060929: BART observation
  40. GRB 060929: MASTER-VWF-Kislovodsk observations
  41. GRB 060929: BOOTES-IR & OSN observations
  42. Liverpool Telescope observations of GRB 060929
  43. GRB060908: optical observations
  44. GRB 060927 optical limit
  45. GRB 060927 : Kiso optical observation
  46. GRB 060927: Swift detection of a burst
  47. GRB060923C: AROMA optical obsevation
  48. GRB 060923, Swift-BAT refined analysis
  49. Swift detection of IGR J17497-2821 (trigger 230504)
  50. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  51. GRB 060919: Swift detection of a burst
  52. Konus-Wind observation of GRB 060912
  53. GRB060912: Swift/UVOT Observations
  54. GRB 060912B: a long GRB detected with INTEGRAL
  55. GRB 060912: Swift XRT Team Refined Analysis
  56. GRB 060912: Swift detection of a burst with an optical afterglow
  57. GRB 060908, Swift/XRT refined analysis
  58. GRB 060908: Swift/UVOT Observations
  59. GRB 060904A : Optical limit
  60. GRB 060908: REM optical prompt observation
  61. GRB 060908: PROMPT Detection of a Bright Counterpart
  62. GRB 060908: Swift detection of a burst with a bright optical counterpart
  63. GRB 060906: optical observation
  64. GRB 060906: observations with FRAM
  65. GRB 060906: Swift detection of a probable burst
  66. GRB 060904B: RTT150 optical observations
  67. Konus-Wind observation of GRB 060904A
  68. Konus-Wind observation of GRB 060901
  69. GRB 060901: further INTEGRAL results
  70. GRB 060901: Watcher observations
  71. GRB 060901: a long GRB detected by INTEGRAL
  72. Two bright bursts from SGR 1806-20 detected with IBAS
  73. GRB 060605: VLA Observation
  74. GRB 060707: VLA observation
  75. GRB 060826(?): Swift detection of a possible burst
  76. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  77. GRB 060813: A long, bright GRB detected with Suzaku WAM
  78. Konus-Wind observation of GRB 060814
  79. GRB 060814: source inside revised XRT error box
  80. GRB 060814: Possible IR counterpart
  81. GRB 060814: Swift XRT refined analysis
  82. GRB 060814 - SDSS Pre-Burst Observations
  83. Konus-Wind observation of GRB 060813
  84. Image of the dust-scattering halo around SGR 1806-20
  85. Second VLA limit on new radio point source in SGR 1806-20
  86. A dust-scattering halo detected around SGR 1806-20
  87. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  88. GRB060807: Optical limiting magnitudes
  89. VLA Upper Limit on Outburst of SGR 1806-20
  90. GRB060806 is similar to previous activity of SGR1806-20
  91. GRB060806 = SGR1806-20
  92. GRB 060805B: RHESSI Spectral Fit
  93. GRB060807: optical upper limit in white light
  94. IPN triangulation of GRB060806 (long, exceptionally bright)
  95. IPN triangulation of GRB060805B
  96. GRB 060805: KAIT observations
  97. GRB060801: optical upper limit in R
  98. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  99. GRB 060729: Refined analysis of the Swift-BAT burst
  100. GRB 060729: Swift detection of a burst with an UVOT optical counterpart

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