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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"

41688 results found.

  1. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  2. GRB060919: Swift/UVOT optical observations
  3. GRB 060919 : Faulkes South Telescope Observations
  4. GRB 060919, Swift-BAT refined analysis
  5. GRB060919: XRT refined analysis
  6. GRB 060919: TAROT optical observations
  7. GRB 060919: Swift detection of a burst
  8. GRB 060912A: VLA Observation
  9. GRB 060912A: Probable Host Galaxy
  10. IBAS Alert n.3470: not a GRB
  11. GRB060825: MAGIC telescope GeV observation
  12. Konus-Wind observation of GRB 060912
  13. IBAS Alert No.3468: not a GRB
  14. GRB 060912: Redshift of nearby 2MASS galaxy
  15. GRB060912: optical observations
  16. GRB 060912B: Watcher observations
  17. GRB060912: Swift/UVOT Observations
  18. GRB060912: OPTIMA-Burst optical observations
  19. GRB 060912B: a long GRB detected with INTEGRAL
  20. GRB 060912: Swift XRT Team Refined Analysis
  21. GRB 060912, Swift-BAT refined analysis
  22. GRB 060912: Correction to GCN 5559
  23. GRB 060912: Swift detection of a burst with an optical afterglow
  24. GRB060906: Danish/DFOSC optical observations
  25. VLA observations of GRB 060908
  26. GRB 060908: redshift
  27. GRB 060908, Swift/XRT refined analysis
  28. GRB 060908: Swift/UVOT Observations
  29. GRB 060908: Danish/DFOSC optical observations
  30. GRB 060908, Swift-BAT refined analysis
  31. GRB 060908 - SDSS Pre-burst Observations
  32. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  33. GRB 060904B: Kiso Optical observation
  34. GRB 060904A : Optical limit
  35. GRB 060908: REM optical prompt observation
  36. GRB 060908: PROMPT Detection of a Bright Counterpart
  37. GRB 060908: Swift detection of a burst with a bright optical counterpart
  38. GRB 060904A: Suzaku/WAM observation of the prompt emission
  39. GRB060906 , optical observation
  40. GRB 060906: Early RAPTOR optical limits
  41. GRB 060906: Swift/XRT Refined Analysis
  42. GRB 060906: Swift-UVOT observations
  43. VLT redshift of GRB 060906
  44. GRB 060906, Swift-BAT refined analysis
  45. GRB 060906: FRAM observations - flash determination (airplane)
  46. GRB 060906: KAIT observations
  47. GRB 060906: Confirmation of P60 Optical Afterglow
  48. GRB 060906: observations with FRAM
  49. GRB 060906 (?): P60 Optical Afterglow Candidate
  50. GRB 060906: Swift detection of a probable burst
  51. GRB 060904A Milagro GeV/TeV Observations
  52. GRB060904b, optical observations
  53. GRB 060904b: SMARTS optical/IR afterglow observations
  54. GRB 060904B: RTT150 optical observations
  55. GRB 060904A: Subaru NIR observation
  56. GRB 060904B: Swift-BAT refined analysis
  57. GRB060904b: Optical observations with Swift/UVOT
  58. Konus-Wind observation of GRB 060904A
  59. GRB 060904B: Swift-XRT refined analysis
  60. GRB 060904A: Refined analysis of the Swift-BAT burst
  61. GRB 060904A: Swift-XRT refined analysis
  62. GRB 060904A: Suzaku-XIS and -HXD observation plan
  63. GRB 060904A: P60 Observations
  64. GRB 060904B: Optical observations at Crni Vrh
  65. GRB060904B: Watcher observations
  66. GRB 060904B BOOTES-IR and 1.5m OSN observations
  67. GRB 060904B: TAROT optical counterpart observations
  68. GRB060904B - SDSS Pre-Burst Observations
  69. GRB 060904: TAROT optical observations
  70. GRB 060904B: Swift detection of a burst with optical counterpart
  71. GRB060904 - SDSS Pre-Burst Observations
  72. GRB 060904: Swift detection of a bright burst
  73. GRB060901: Optical observations
  74. 060901: Swift UVOT followup observations
  75. Konus-Wind observation of GRB 060901
  76. GRB 060901: SMARTS optical/IR observations update
  77. GRB 060901: Swift/XRT Refined Analysis
  78. GRB 060901: SMARTS optical/IR observations
  79. GRB 060901: Swift/XRT Position
  80. GRB 060901: further INTEGRAL results
  81. GRB 060901: Watcher observations
  82. GRB 060901: a long GRB detected by INTEGRAL
  83. Two bright bursts from SGR 1806-20 detected with IBAS
  84. GRB 060605, observations using an Integral Field Unit
  85. GRB 060604: VLA Observation
  86. GRB 060814: Suzaku/WAM observation of the prompt emission
  87. GRB 060605: VLA Observation
  88. GRB 060707: VLA observation
  89. GRB 060825: VLA observations
  90. GRB060826 - SDSS Pre-Burst Observations
  91. GRB 060826(?): Swift detection of a possible burst
  92. GRB 060825: XRT Team Refined Analysis
  93. GRB 060825: Swift-BAT Refined Analysis
  94. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  95. GRB 060825: TNG optical observations
  96. GRB 060825: TAROT optical observations
  97. GRB 060825: P60 Observations
  98. GRB060825: BOOTES-IR optical observations
  99. GRB 060825: Swift detection of a burst
  100. GRB060801: host galaxy redshift

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