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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"

11064 results found.

  1. GRB 060929: BOOTES-IR & OSN observations
  2. Liverpool Telescope observations of GRB 060929
  3. GRB060908: optical observations
  4. GRB 060927 optical limit
  5. GRB 060927 : Kiso optical observation
  6. GRB 060927: Swift detection of a burst
  7. GRB060923C: AROMA optical obsevation
  8. GRB 060923, Swift-BAT refined analysis
  9. Swift detection of IGR J17497-2821 (trigger 230504)
  10. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  11. GRB 060919: Swift detection of a burst
  12. Konus-Wind observation of GRB 060912
  13. GRB060912: Swift/UVOT Observations
  14. GRB 060912B: a long GRB detected with INTEGRAL
  15. GRB 060912: Swift XRT Team Refined Analysis
  16. GRB 060912: Swift detection of a burst with an optical afterglow
  17. GRB 060908, Swift/XRT refined analysis
  18. GRB 060908: Swift/UVOT Observations
  19. GRB 060904A : Optical limit
  20. GRB 060908: REM optical prompt observation
  21. GRB 060908: PROMPT Detection of a Bright Counterpart
  22. GRB 060908: Swift detection of a burst with a bright optical counterpart
  23. GRB 060906: optical observation
  24. GRB 060906: observations with FRAM
  25. GRB 060906: Swift detection of a probable burst
  26. GRB 060904B: RTT150 optical observations
  27. Konus-Wind observation of GRB 060904A
  28. Konus-Wind observation of GRB 060901
  29. GRB 060901: further INTEGRAL results
  30. GRB 060901: Watcher observations
  31. GRB 060901: a long GRB detected by INTEGRAL
  32. Two bright bursts from SGR 1806-20 detected with IBAS
  33. GRB 060605: VLA Observation
  34. GRB 060707: VLA observation
  35. GRB 060826(?): Swift detection of a possible burst
  36. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  37. GRB 060813: A long, bright GRB detected with Suzaku WAM
  38. Konus-Wind observation of GRB 060814
  39. GRB 060814: source inside revised XRT error box
  40. GRB 060814: Possible IR counterpart
  41. GRB 060814: Swift XRT refined analysis
  42. GRB 060814 - SDSS Pre-Burst Observations
  43. Konus-Wind observation of GRB 060813
  44. Image of the dust-scattering halo around SGR 1806-20
  45. Second VLA limit on new radio point source in SGR 1806-20
  46. A dust-scattering halo detected around SGR 1806-20
  47. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  48. GRB060807: Optical limiting magnitudes
  49. VLA Upper Limit on Outburst of SGR 1806-20
  50. GRB060806 is similar to previous activity of SGR1806-20
  51. GRB060806 = SGR1806-20
  52. GRB 060805B: RHESSI Spectral Fit
  53. GRB060807: optical upper limit in white light
  54. IPN triangulation of GRB060806 (long, exceptionally bright)
  55. IPN triangulation of GRB060805B
  56. GRB 060805: KAIT observations
  57. GRB060801: optical upper limit in R
  58. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  59. GRB 060729: Refined analysis of the Swift-BAT burst
  60. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  61. GRB 060719: optical limit by Pi-of-the-Sky
  62. GRB 060719: LCO optical observations
  63. GRB 060714: Refined analysis of the Swift-BAT burst
  64. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  65. GRB 060605: SkyNet Optical Limits
  66. GRB 060707: BOOTES-IR optical observation
  67. GRB 060707: Swift detection of a burst
  68. Konus-Wind observation of GRB 060614
  69. GRB060614: SSO 1m observations
  70. GRB060614: Watcher observation
  71. GRB 060610: KAIT observations
  72. GRB 060607: Swift detection of a burst with bright optical counterpart
  73. GRB 060522: PROMPT Optical Limits
  74. GRB 060605: RTT150 optical observations
  75. GRB 060605: Swift detection of a burst with optical counterpart
  76. GRB060604: Swift/UVOT detections
  77. GRB 060604A: ROTSE-III Optical Limits
  78. GRB 060604: Swift detection of a burst with possible optical counterpart
  79. GRB 060526: Tautenburg Second Epoch Observations
  80. GRB 060602B: Swift detection of a burst
  81. GRB 060526: RTT150 optical observations
  82. GRB060526: optical observations
  83. GRB 060526: Swift/XRT Team refined analysis
  84. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  85. XMM-Newton observation of GRB060510b
  86. GRB 060522: Swift/XRT Team refined analysis
  87. GRB 060522: Swift-BAT Refined Analysis
  88. GRB 060516: Refined analysis of the Swift-BAT burst
  89. GRB 060515: ROTSE-III Optical Limits
  90. GRB 060512: Detection of NIR afterglow
  91. GRB060512 Name Correction: LT Afterglow detection
  92. GRB060512: Liverpool Telescope Afterglow detection
  93. GRB 060512: Swift detection of a burst with an optical afterglow
  94. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  95. Konus-Wind observation of GRB 060510A
  96. GRB 060428a, SMARTS optical/IR afterglow detection
  97. GRB 060429: Suzaku WAM observation
  98. GRB060505: Swift/UVOT Observations
  99. GRB 060505: Swift XRT afterglow canditate position
  100. GRB 060502B: optical observations

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