Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

22854 results found.

  1. GRB 080426: Swift-XRT refined analysis
  2. GRB080426: Swift/UVOT upper limits
  3. GRB 080426: Enhanced Swift-XRT position
  4. GRB 080426: Swift detection of a possibly short burst
  5. Possible GRB 080315: XRT non-detection of afterglow
  6. GRB 080320 : Faulkes Telescope North Observations
  7. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  8. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  9. GRB 080420?: Swift detection of a possible short burst
  10. GRB080310, BVRcIc field calibration
  11. Swift XRT and UVOT observations of GRB080414
  12. GRB 080319B: Jet Break, Energetics, Supernova
  13. GRB 080413B: Faulkes Telescope South optical afterglow observations
  14. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  15. GRB 080414: RTT150 optical observations
  16. VLA radio observations of GRB 080413B
  17. VLA radio observations of GRB 080413A
  18. GRB080413B
  19. GRB 080413a, SMARTS optical/IR afterglow observations
  20. GRB080413A: Swift/UVOT observations
  21. GRB 080413A: Swift-XRT refined analysis
  22. GRB080413B: REM NIR & Optical Observation
  23. GRB 080413B: GROND detection of afterglow in all bands
  24. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  25. GRB 080413A: REM detection of the NIR Afterglow
  26. GRB 080413: Enhanced Swift-XRT position
  27. GRB 080413: TAROT Calern observatory optical observations
  28. GRB 080413: Swift detection of a burst with an optical afterglow
  29. GRB 080411: Swift/UVOT refined analysis
  30. GRB 080411: Swift-XRT Refined Analysis
  31. GRB 080411: Enhanced Swift-XRT position
  32. GRB 080411: GROND detection of optical afterglow candidate
  33. GRB 080411: Swift detection of a bright burst
  34. GRB 080409: Swift-BAT refined analysis
  35. GRB 080408: GROND detection of optical/NIR afterglow candidate
  36. GRB 080330 optical observations
  37. Swift/UVOT observations of GRB080409
  38. GRB 080409: Swift XRT refined analysis
  39. UVOT/Swift Observations of GRB080408
  40. GRB 080409: Enhanced Swift-XRT position
  41. GRB 080409: REM optical/NIR observations
  42. GRB 080409: Swift detection of a burst
  43. GRB 080408: GRB Localization by SuperAGILE
  44. GRB 080319A: Early RAPTOR optical limits
  45. GRB 080319B: HST observations
  46. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  47. GRB 080405: Swift-BAT refined analysis
  48. GRB 080405: Swift-XRT position
  49. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  50. GRB 080325: optical upper limit
  51. GRB 080328: GAO 150cm telescope Optical Observation
  52. GRB080330: Improved Swift XRT Position
  53. GRB080328, RIMOTS optical upper limit
  54. GRB 080330: REM optical observations
  55. GRB 080330 Swift-UVOT refined analysis
  56. GRB080330: TNT optical observations
  57. GRB 080330, Swift-BAT refined analysis
  58. GRB080330: LOAO R-band Detection
  59. GRB 080330: GROND Observations
  60. GRB 080330A: PAIRITEL Infrared Detections
  61. GRB 080330: error in reported XRT position
  62. GRB080330 - SDSS Pre-Burst Observations
  63. GRB 080330: Liverpool Telescope Optical observations
  64. GRB 080330: Swift detection of a burst with an optical counterpart
  65. GRB 080330: TAROT Calern observatory optical detection
  66. GRB 080328: BTA optical imaging and spectroscopy
  67. GRB 080328: Swift XRT refined analysis
  68. Swift/UVOT observations of GRB080328
  69. GRB080325 - I and z-band Imaging
  70. GRB080319B, BVRcIc field calibration
  71. GRB 080328: Enhanced Swift-XRT position
  72. GRB 080328: Swift detection of a burst with an optical counterpart
  73. GRB 080325: Subaru detection of NIR afterglow candidate
  74. GRB 080325: MITSuME Akeno optical upper limits
  75. GRB 080325: GROND Observations
  76. GRB 080325: Swift/UVOT Upper Limits
  77. GRB 080325: Early observations from OSN
  78. GRB 080325: NIR afterglow candidate
  79. GRB 080319D: GROND Detection of the Optical Counterpart
  80. GRB 080325: Enhanced Swift-XRT position
  81. GRB 080325: Swift detection of a burst
  82. GRB 080319B: Spitzer Mid-infrared Observations
  83. Radio Detection of GRB 080319B
  84. GRB 080320, Swift-BAT refined analysis
  85. GRB 080319D: GROND Observations
  86. GRB 080319B: optical upper limit
  87. GRB 080319D: optical upper limit
  88. GRB 080319C: UVOT Observations
  89. GRB 080319B: UVOT Observations
  90. GRB 080319A: UVOT Observations
  91. GRB 080320: Swift XRT refined analysis
  92. GRB 080319B - CARMA mm Observations
  93. GRB 080320: Early Super-LOTIS Observations
  94. GRB 080320: J detection with FLAMINGOS
  95. GRB 080319D: Swift XRT refined analysis
  96. GRB 080320: optical limit
  97. GRB 080320: Gemini-N optical afterglow
  98. GRB 080319B: Allen Telescope Array Observations
  99. GRB 080319C, Swift-BAT refined analysis
  100. GRB 080320: Enhanced Swift-XRT position

Advanced

Download all Circulars as a .tar.gz archive:
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