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"

24365 results found.

  1. GRB 080413: ROTSE-III Detection of Optical Counterpart
  2. GRB 080411, Swift-BAT refined analysis
  3. GRB 080411: Swift-XRT Refined Analysis
  4. Konus-Wind observation of GRB 080411
  5. GRB 080411: VLT redshift
  6. GRB080330: MAGIC telescope GeV observation
  7. GRB 080411: Swift detection of a bright burst
  8. GRB 080409: Swift-BAT refined analysis
  9. GRB 080330 optical observations
  10. GRB 080408: Analysis of AGILE Gamma-ray data
  11. GRB 080408: GRB Localization by SuperAGILE
  12. GRB 080319A: Early RAPTOR optical limits
  13. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  14. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  15. GRB 080325: optical upper limit
  16. GRB 080330: Prompt PROMPT Observations
  17. GRB 080319B: TORTORA light curve (Correction)
  18. GRB080328, RIMOTS optical upper limit
  19. GRB080330: optical observations
  20. GRB 080330, SMARTS optical/IR afterglow observations
  21. GRB 080328: Suzaku WAM observation of the prompt emission
  22. GRB080330: TNT optical observations
  23. GRB 080330, Swift-BAT refined analysis
  24. Konus-Wind observation of GRB 080328
  25. GRB080330: LOAO R-band Detection
  26. GRB 080330: Liverpool Telescope Optical observations
  27. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  28. GRB 080328, Swift-BAT refined analysis
  29. GRB 080325, Swift-BAT refined analysis
  30. GRB080328: Faulkes Telescope North observations
  31. GRB 080328: Swift detection of a burst with an optical counterpart
  32. GRB080310, late-time photometry with LBT
  33. GRB 080325: MITSuME Akeno optical upper limits
  34. GRB 080325: GROND Observations
  35. GRB080319B: optical observations
  36. GRB 080319C: Gemini-North spectroscopic redshift
  37. GRB 080325: Early observations from OSN
  38. GRB 080319D: GROND Detection of the Optical Counterpart
  39. GRB 080325: Swift detection of a burst
  40. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  41. IBAS Alert n. 5245: NOT a GRB
  42. GRB 080319C: Suzaku WAM observation of the prompt emission
  43. GRB 080320, Swift-BAT refined analysis
  44. GRB 080319B: Optical observation (Brno, CZ)
  45. GRB 080319D: GROND Observations
  46. GRB 080319B: TORTORA light curve
  47. GRB 080319B: optical upper limit
  48. GRB 080319D: optical upper limit
  49. GRB080319B: Time-Independent XRT Spectrum
  50. GRB 080319D, Swift-BAT refined analysis
  51. GRB 080319A: UVOT Observations
  52. GRB 080319B - CARMA mm Observations
  53. GRB 080320: optical limit
  54. Konus-Wind observation of GRB 080319C
  55. GRB 080319C, Swift-BAT refined analysis
  56. Konus-Wind observation of GRB 080319B
  57. GRB 080320: optical limit from IAC80
  58. GRB 080320: Swift detection of a burst
  59. GRB 080320: ROTSE-III Optical Limits
  60. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  61. GRB 080319B: RAPTOR observations of a naked eye burst
  62. GRB 080319A: Swift-XRT Team Refined Analysis
  63. GRB 080319B, Swift-BAT refined analysis
  64. GRB080319B: Prompt PROMPT Detections
  65. GRB 080319C: Swift-XRT Team Refined Analysis
  66. GRB 080319C: AGILE-MCAL observation of the prompt emission
  67. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  68. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  69. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  70. GRB 080319B: TORTORA synchronous observation
  71. GRB 080319A, Swift-BAT refined analysis
  72. GRB 080319B: REM early data
  73. GRB080319B Liverpool Telescope optical afterglow candidate
  74. GRB 080319B: REM observations
  75. Swift trigger 306323: Swift-BAT/XRT refined analysis
  76. GRB 080315: Optical observations
  77. GRB080310 : Optical observations by LOAO and Lulin
  78. GRB 080310: ROTSE-III Observations of Optical Counterpart
  79. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  80. GRB 080310: early RAPTOR multicolor observations
  81. GRB 080310, Swift-BAT refined analysis
  82. GRB 080310: Swift-XRT refined analysis
  83. GRB 080310, SMARTS optical/IR afterglow observations
  84. GRB 080310: REM observations
  85. GRB 080310 afterglow candidate (correction to UT time)
  86. GRB080229, optical upper limit (Correction)
  87. GRB080307, optical upper limit
  88. GRB080229, optical upper limit
  89. GRB 080307, Swift-BAT refined analysis
  90. GRB 080307: Gemini-N i-band observations - candidate afterglow
  91. GRB 080307, Preliminary Swift-BAT refined analysis
  92. GRB 080307: Optical observation with DMC/KANATA
  93. GRB 080303, Swift-BAT refined analysis
  94. GRB 080303: Rapid PROMPT Detections
  95. GRB 080303A: Faulkes Telescope South optical afterglow observations
  96. GRB 080303: Swift detection of a burst with optical afterglow
  97. GRB 080303A: ROTSE-III Optical Limits
  98. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  99. GRB 080229, Swift-BAT refined analysis
  100. GRB 080229: Faulkes Telescope South optical limit

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