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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"

11097 results found.

  1. GRB061102B: Super-LOTIS observations
  2. GRB 061028: Optical R passband observations
  3. GRB 061028: z band imaging
  4. GRB 061027, Swift refined analysis of a possible burst
  5. GRB061025: Swift XRT refined analysis
  6. GRB 061025: Gemini-S observations
  7. GRB061025: Swift XRT position
  8. GRB 061025: ROTSE-III Optical Limits
  9. GRB 061025: a long GRB detected by INTEGRAL
  10. Konus-Wind observation of GRB 061021
  11. GRB 061021: Swift-XRT refined analysis
  12. GRB 061021: Swift detection of a burst
  13. GRB061019: optical observations
  14. GRB 061019: SARA upper limit
  15. GRB 060930: MARGE Optical Limits
  16. GRB 061019, Swift-BAT refined analysis
  17. GRB 061019: Swift-BAT detection of a burst
  18. GRB 061007: RHESSI Spectral Fit
  19. Konus-Wind observation of GRB 061007
  20. Konus-Wind observation of the short hard GRB 061006
  21. Konus-Wind observation of GRB 060928
  22. GRB 060928: RHESSI Spectral Fit
  23. GRB 060930: near-IR afterglow candidate
  24. GRB 061002, Swift-BAT refined analysis
  25. GRB061002: MASTER-VWF-Kislovodsk observations
  26. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  27. GRB 061002: Swift detection of a burst
  28. GRB 060807: Detection of a possible host galaxy
  29. GRB060930: Faulkes Telescope South observation
  30. GRB 060930: ROTSE-III Optical Limits
  31. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  32. GRB 060929: BART observation
  33. GRB 060929: MASTER-VWF-Kislovodsk observations
  34. GRB 060929: BOOTES-IR & OSN observations
  35. Liverpool Telescope observations of GRB 060929
  36. GRB060908: optical observations
  37. GRB 060927 optical limit
  38. GRB 060927 : Kiso optical observation
  39. GRB 060927: Swift detection of a burst
  40. GRB060923C: AROMA optical obsevation
  41. GRB 060923, Swift-BAT refined analysis
  42. Swift detection of IGR J17497-2821 (trigger 230504)
  43. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  44. GRB 060919: Swift detection of a burst
  45. Konus-Wind observation of GRB 060912
  46. GRB060912: Swift/UVOT Observations
  47. GRB 060912B: a long GRB detected with INTEGRAL
  48. GRB 060912: Swift XRT Team Refined Analysis
  49. GRB 060912: Swift detection of a burst with an optical afterglow
  50. GRB 060908, Swift/XRT refined analysis
  51. GRB 060908: Swift/UVOT Observations
  52. GRB 060904A : Optical limit
  53. GRB 060908: REM optical prompt observation
  54. GRB 060908: PROMPT Detection of a Bright Counterpart
  55. GRB 060908: Swift detection of a burst with a bright optical counterpart
  56. GRB 060906: optical observation
  57. GRB 060906: observations with FRAM
  58. GRB 060906: Swift detection of a probable burst
  59. GRB 060904B: RTT150 optical observations
  60. Konus-Wind observation of GRB 060904A
  61. Konus-Wind observation of GRB 060901
  62. GRB 060901: further INTEGRAL results
  63. GRB 060901: Watcher observations
  64. GRB 060901: a long GRB detected by INTEGRAL
  65. Two bright bursts from SGR 1806-20 detected with IBAS
  66. GRB 060605: VLA Observation
  67. GRB 060707: VLA observation
  68. GRB 060826(?): Swift detection of a possible burst
  69. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  70. GRB 060813: A long, bright GRB detected with Suzaku WAM
  71. Konus-Wind observation of GRB 060814
  72. GRB 060814: source inside revised XRT error box
  73. GRB 060814: Possible IR counterpart
  74. GRB 060814: Swift XRT refined analysis
  75. GRB 060814 - SDSS Pre-Burst Observations
  76. Konus-Wind observation of GRB 060813
  77. Image of the dust-scattering halo around SGR 1806-20
  78. Second VLA limit on new radio point source in SGR 1806-20
  79. A dust-scattering halo detected around SGR 1806-20
  80. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  81. GRB060807: Optical limiting magnitudes
  82. VLA Upper Limit on Outburst of SGR 1806-20
  83. GRB060806 is similar to previous activity of SGR1806-20
  84. GRB060806 = SGR1806-20
  85. GRB 060805B: RHESSI Spectral Fit
  86. GRB060807: optical upper limit in white light
  87. IPN triangulation of GRB060806 (long, exceptionally bright)
  88. IPN triangulation of GRB060805B
  89. GRB 060805: KAIT observations
  90. GRB060801: optical upper limit in R
  91. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  92. GRB 060729: Refined analysis of the Swift-BAT burst
  93. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  94. GRB 060719: optical limit by Pi-of-the-Sky
  95. GRB 060719: LCO optical observations
  96. GRB 060714: Refined analysis of the Swift-BAT burst
  97. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  98. GRB 060605: SkyNet Optical Limits
  99. GRB 060707: BOOTES-IR optical observation
  100. GRB 060707: Swift detection of a burst

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