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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"

11757 results found.

  1. GRB 060923, Swift-BAT refined analysis
  2. Swift detection of IGR J17497-2821 (trigger 230504)
  3. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  4. GRB 060919: Swift detection of a burst
  5. Konus-Wind observation of GRB 060912
  6. GRB060912: Swift/UVOT Observations
  7. GRB 060912B: a long GRB detected with INTEGRAL
  8. GRB 060912: Swift XRT Team Refined Analysis
  9. GRB 060912: Swift detection of a burst with an optical afterglow
  10. GRB 060908, Swift/XRT refined analysis
  11. GRB 060908: Swift/UVOT Observations
  12. GRB 060904A : Optical limit
  13. GRB 060908: REM optical prompt observation
  14. GRB 060908: PROMPT Detection of a Bright Counterpart
  15. GRB 060908: Swift detection of a burst with a bright optical counterpart
  16. GRB 060906: optical observation
  17. GRB 060906: observations with FRAM
  18. GRB 060906: Swift detection of a probable burst
  19. GRB 060904B: RTT150 optical observations
  20. Konus-Wind observation of GRB 060904A
  21. Konus-Wind observation of GRB 060901
  22. GRB 060901: further INTEGRAL results
  23. GRB 060901: Watcher observations
  24. GRB 060901: a long GRB detected by INTEGRAL
  25. Two bright bursts from SGR 1806-20 detected with IBAS
  26. GRB 060605: VLA Observation
  27. GRB 060707: VLA observation
  28. GRB 060826(?): Swift detection of a possible burst
  29. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  30. GRB 060813: A long, bright GRB detected with Suzaku WAM
  31. Konus-Wind observation of GRB 060814
  32. GRB 060814: source inside revised XRT error box
  33. GRB 060814: Possible IR counterpart
  34. GRB 060814: Swift XRT refined analysis
  35. GRB 060814 - SDSS Pre-Burst Observations
  36. Konus-Wind observation of GRB 060813
  37. Image of the dust-scattering halo around SGR 1806-20
  38. Second VLA limit on new radio point source in SGR 1806-20
  39. A dust-scattering halo detected around SGR 1806-20
  40. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  41. GRB060807: Optical limiting magnitudes
  42. VLA Upper Limit on Outburst of SGR 1806-20
  43. GRB060806 is similar to previous activity of SGR1806-20
  44. GRB060806 = SGR1806-20
  45. GRB 060805B: RHESSI Spectral Fit
  46. GRB060807: optical upper limit in white light
  47. IPN triangulation of GRB060806 (long, exceptionally bright)
  48. IPN triangulation of GRB060805B
  49. GRB 060805: KAIT observations
  50. GRB060801: optical upper limit in R
  51. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  52. GRB 060729: Refined analysis of the Swift-BAT burst
  53. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  54. GRB 060719: optical limit by Pi-of-the-Sky
  55. GRB 060719: LCO optical observations
  56. GRB 060714: Refined analysis of the Swift-BAT burst
  57. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  58. GRB 060605: SkyNet Optical Limits
  59. GRB 060707: BOOTES-IR optical observation
  60. GRB 060707: Swift detection of a burst
  61. Konus-Wind observation of GRB 060614
  62. GRB060614: SSO 1m observations
  63. GRB060614: Watcher observation
  64. GRB 060610: KAIT observations
  65. GRB 060607: Swift detection of a burst with bright optical counterpart
  66. GRB 060522: PROMPT Optical Limits
  67. GRB 060605: RTT150 optical observations
  68. GRB 060605: Swift detection of a burst with optical counterpart
  69. GRB060604: Swift/UVOT detections
  70. GRB 060604A: ROTSE-III Optical Limits
  71. GRB 060604: Swift detection of a burst with possible optical counterpart
  72. GRB 060526: Tautenburg Second Epoch Observations
  73. GRB 060602B: Swift detection of a burst
  74. GRB 060526: RTT150 optical observations
  75. GRB060526: optical observations
  76. GRB 060526: Swift/XRT Team refined analysis
  77. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  78. XMM-Newton observation of GRB060510b
  79. GRB 060522: Swift/XRT Team refined analysis
  80. GRB 060522: Swift-BAT Refined Analysis
  81. GRB 060516: Refined analysis of the Swift-BAT burst
  82. GRB 060515: ROTSE-III Optical Limits
  83. GRB 060512: Detection of NIR afterglow
  84. GRB060512 Name Correction: LT Afterglow detection
  85. GRB060512: Liverpool Telescope Afterglow detection
  86. GRB 060512: Swift detection of a burst with an optical afterglow
  87. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  88. Konus-Wind observation of GRB 060510A
  89. GRB 060428a, SMARTS optical/IR afterglow detection
  90. GRB 060429: Suzaku WAM observation
  91. GRB060505: Swift/UVOT Observations
  92. GRB 060505: Swift XRT afterglow canditate position
  93. GRB 060502B: optical observations
  94. GRB 060502B: AROMA refined photometric calibration
  95. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  96. GRB 060502B: AROMA optical observations
  97. GRB 060502B: Refined analysis of the Swift-BAT short burst
  98. GRB 060502B: Xinglong optical observation
  99. GRB 060502B: Swift detection of a short burst
  100. GRB060502: Super-LOTIS Observations

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