Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

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"

35948 results found.

  1. GRB060923C : Faulkes Telescope South optical limits
  2. GRB060923C: Faulkes Telescope North optical observations
  3. GRB 060923C: optical observation
  4. GRB 060923C: Swift detection of a burst
  5. GRB 060923B: Swift detection of a burst
  6. GRB 060923, Swift-BAT refined analysis
  7. GRB 060923: Early Super-LOTIS Observations
  8. GRB 060923: UKIRT nIR observations - candidate afterglow
  9. GRB060923 - SDSS Pre-Burst Observations
  10. GRB 060923: KAIT observations
  11. GRB 060923: Swift detection of a burst
  12. Swift detection of IGR J17497-2821 (trigger 230504)
  13. GRB 060919 : Faulkes South Telescope Observations
  14. GRB 060919, Swift-BAT refined analysis
  15. GRB060919: XRT refined analysis
  16. GRB 060919: TAROT optical observations
  17. GRB 060919: Swift detection of a burst
  18. GRB 060912A: VLA Observation
  19. GRB 060912A: Probable Host Galaxy
  20. IBAS Alert n.3470: not a GRB
  21. GRB060825: MAGIC telescope GeV observation
  22. Konus-Wind observation of GRB 060912
  23. IBAS Alert No.3468: not a GRB
  24. GRB 060912: Redshift of nearby 2MASS galaxy
  25. GRB060912: optical observations
  26. GRB 060912B: Watcher observations
  27. GRB060912: OPTIMA-Burst optical observations
  28. GRB 060912B: a long GRB detected with INTEGRAL
  29. GRB 060912: Swift XRT Team Refined Analysis
  30. GRB 060912, Swift-BAT refined analysis
  31. GRB 060912: Correction to GCN 5559
  32. GRB 060912: Xinglong TNT optical observations
  33. GRB 060912: Swift detection of a burst with an optical afterglow
  34. VLA observations of GRB 060908
  35. GRB 060908: redshift
  36. GRB 060908, Swift/XRT refined analysis
  37. GRB 060908: Swift/UVOT Observations
  38. GRB 060908: Danish/DFOSC optical observations
  39. GRB 060908, Swift-BAT refined analysis
  40. GRB 060908 - SDSS Pre-burst Observations
  41. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  42. GRB 060904B: Kiso Optical observation
  43. GRB 060904A : Optical limit
  44. GRB 060908: REM optical prompt observation
  45. GRB 060908: PROMPT Detection of a Bright Counterpart
  46. GRB 060908: Swift detection of a burst with a bright optical counterpart
  47. GRB 060904A: Suzaku/WAM observation of the prompt emission
  48. GRB 060906: optical observation
  49. GRB 060906: Early RAPTOR optical limits
  50. GRB 060906, Swift-BAT refined spectral analysis
  51. GRB 060906: Swift/XRT Refined Analysis
  52. GRB 060906: Swift-UVOT observations
  53. VLT redshift of GRB 060906
  54. GRB 060906, Swift-BAT refined analysis
  55. GRB 060906: FRAM observations - flash determination (airplane)
  56. GRB 060906: KAIT observations
  57. GRB 060906: Confirmation of P60 Optical Afterglow
  58. GRB 060906: observations with FRAM
  59. GRB 060906 (?): P60 Optical Afterglow Candidate
  60. GRB 060906: Swift detection of a probable burst
  61. GRB 060904A Milagro GeV/TeV Observations
  62. GRB060904b, optical observations
  63. GRB 060904b: SMARTS optical/IR afterglow observations
  64. GRB 060904B: RTT150 optical observations
  65. GRB060904A: Swift/UVOT optical observations
  66. GRB 060904A: Subaru NIR observation
  67. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  68. GRB 060904B: Swift-BAT refined analysis
  69. Konus-Wind observation of GRB 060904A
  70. GRB 060904B: Swift-XRT refined analysis
  71. GRB 060904A: Refined analysis of the Swift-BAT burst
  72. GRB 060904A: Swift-XRT refined analysis
  73. GRB 060904A: Suzaku-XIS and -HXD observation plan
  74. GRB 060904B: VLT redshift
  75. GRB 060904A: P60 Observations
  76. GRB 060904B: Optical observations at Crni Vrh
  77. GRB060904B: Watcher observations
  78. GRB 060904B BOOTES-IR and 1.5m OSN observations
  79. GRB 060904B: TAROT optical counterpart observations
  80. GRB060904B - SDSS Pre-Burst Observations
  81. GRB 060904: TAROT optical observations
  82. GRB 060904B: Swift detection of a burst with optical counterpart
  83. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  84. GRB060904 - SDSS Pre-Burst Observations
  85. GRB 060904: Swift detection of a bright burst
  86. GRB 060901: pseudo-z from spectral parameters of the prompt
  87. Konus-Wind observation of GRB 060901
  88. GRB 060901: SMARTS optical/IR observations update
  89. GRB 060901: Swift/XRT Refined Analysis
  90. GRB 060901: SMARTS optical/IR observations
  91. GRB 060901: Swift/XRT Position
  92. GRB 060901: further INTEGRAL results
  93. GRB 060901: Watcher observations
  94. GRB 060901: a long GRB detected by INTEGRAL
  95. GRB 060605, observations using an Integral Field Unit
  96. GRB 060604: VLA Observation
  97. GRB 060814: Suzaku/WAM observation of the prompt emission
  98. GRB 060605: VLA Observation
  99. GRB 060707: VLA observation
  100. GRB 060825: VLA observations

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov