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"

32506 results found.

  1. GRB 071011: Early Super-LOTIS Observations
  2. GRB 071011: NAYUTA Optical Observation
  3. GRB 071010A: Continued Keck Imaging
  4. GRB 071010B: Bright OT confirmed with TLS
  5. Optical Observation: GRB 071010
  6. Optical observations: GRB 071010A
  7. Konus-Wind observation of GRB 071010B
  8. GRB071010B: Swift/XRT detection
  9. GRB 071010B, Swift-BAT refined analysis
  10. GRB 071010A: bright NIR afterglow
  11. GRB 071006, Swift-BAT refined analysis
  12. GRB071008: optical observations
  13. GRB 071010B possible optical transient
  14. GRB 071010A: Keck/LRIS Photometry
  15. GRB 071010: Swift-XRT observation
  16. GRB 071008, Swift-BAT refined analysis
  17. GRB 071010, Swift-BAT refined analysis
  18. Konus-Wind observation of GRB 071006
  19. GRB071008: Swift-XRT observation
  20. GRB 071010 REM NIR observations
  21. GRB 071010: Keck/LRIS Spectroscopy
  22. GRB 071010: Rapid PROMPT Detections
  23. GRB 071010: Keck Observations of the Afterglow
  24. GRB071008: IAC80 observation
  25. GRB 071003: XRT refined analysis
  26. GRB070920A: MAGIC telescope GeV observation
  27. Radio detection of GRB 071003 with the VLA
  28. GRB 070810B: further XRT analysis
  29. GRB 071003: VLT spectroscopy
  30. GRB 071003: Keck spectroscopy
  31. Konus-Wind observation of GRB 071003
  32. GRB071003: Faulkes Telescope North observations
  33. GRB 071003: Possible rebrightening
  34. GRB 071003 : Lulin R-band observations
  35. GRB 071003: Swift XRT position
  36. GRB 071003: OA power-law decay indices from KAIT
  37. GRB 071003: Keck HIRES spectroscopy
  38. GRB 071003, Swift-BAT refined analysis
  39. GRB 071003: MARGE Observations
  40. GRB 071003 Optical observations
  41. GRB 071003: P60 Confirmation of Optical Afterglow
  42. GRB 071003: KAIT optical afterglow observations
  43. GRB 070714B: host galaxy spectroscopic redshift
  44. GRB 071001: Swift-XRT Team refined analysis
  45. GRB 071001, Swift-BAT refined analysis
  46. Faulkes Telescope South observations of GRB 071001
  47. VLA observation of GRB 070923
  48. Disregard the Swift-XRT Notices today
  49. GRB 070911, SMARTS optical/IR afterglow observations
  50. GRB070925: Swift-XRT Afterglow confirmation
  51. GRB 070925: Gemini South Imaging
  52. GRB070925: Swift-XRT Position
  53. Update on Swift Status
  54. GRB 070920B: ROTSE-III Early Optical Limits
  55. Recent SGR1806-20 Activity
  56. GRB 070923, Swift-BAT refined analysis
  57. GRB 070920B: XRT observations
  58. GRB 070923: Galaxies within BAT localization
  59. GRB 070917: Suzaku/WAM observation of the prompt emission
  60. INTEGRAL ToO observations of SGR1806-20
  61. GRB 070920b, SMARTS optical observation
  62. GRB 070917: Confirmation of the X-ray afterglow
  63. GRB 070920b: LCO optical observations
  64. GRB 070920B, Swift-BAT refined analysis
  65. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  66. GRB 070920, Swift-BAT refined analysis
  67. SGR1806-20: Swift-BAT detection of enhanced activity
  68. GRB070917: Confirmation of optical afterglow
  69. GRB920925C: search for host galaxy
  70. GRB070917: optical observations
  71. GRB 070917: P60 Observations
  72. Konus-Wind observation of GRB 070917
  73. Swift Status and XRT Calibration Uncertainties
  74. GRB 070917: Swift-XRT observations
  75. GRB 070917: KAIT optical limits
  76. GRB 070917: MITSuME Akeno Ic upper limit
  77. GRB 070917: R band observations
  78. GRB 070917, Swift-BAT refined analysis
  79. GRB 070911: Suzaku WAM observation of the prompt emission
  80. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  81. GRB 070809: The Swift evidence for the SHB nature of this burst
  82. GRB 070913: Swift-BAT refined analysis
  83. GRB 070913: Corrected BAT position
  84. GRB 070913: SMARTS optical/IR observations
  85. GRB 070911: PAIRITEL IR Observations
  86. GRB 070911: Swift XRT refined analysis
  87. GRB 070911, Swift-BAT refined analysis
  88. IPN search for a GRB associated with TAROT transient on August 31
  89. Intense burst from SGR 1806-20 detected on September 7
  90. GRB 070809: Confirmation of optical transient
  91. Observations of possible TAROT GRB transient near IC 4779
  92. GRB 070810b: Image Subtraction of Multiple Keck Observations
  93. Las Campanas observations of possible TAROT GRB transient near IC
  94. Konus-Wind observation of GRB 070824
  95. Konus-Wind observation of very bright GRB 070821
  96. GRB 070731: Swift/UVOT Upper Limit
  97. GRB 070805: UVOT afterglow candidate retraction
  98. GRB070810b: optical candidate
  99. GRB 070810A: ROTSE-III Refined Analysis
  100. GRB 061110A: redshift confirmed

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