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"

32494 results found.

  1. GRB 080413A: Gemini-South Spectroscopy
  2. GRB 080413B: Gemini-South Spectroscopy
  3. VLA radio observations of GRB 080413A
  4. GRB 080413B: Ep,i-Eiso correlation
  5. GRB080413B
  6. Swift-BAT spectral lag analysis of GRB 080413B
  7. GRB 080413a, SMARTS optical/IR afterglow observations
  8. GRB 080413B: Swift XRT refined analysis
  9. GRB080413A: Swift/UVOT observations
  10. GRB 080413B, Swift-BAT refined analysis
  11. GRB 080413A: Swift-XRT refined analysis
  12. GRB 080413A, Swift-BAT refined analysis
  13. GRB 080413A Bootes observation
  14. GRB 080413A: VLT/UVES redshift
  15. GRB 080413B: VLT redshift
  16. GRB080413B: REM NIR & Optical Observation
  17. GRB 080413B: GROND detection of afterglow in all bands
  18. GRB 080413A: REM detection of the NIR Afterglow
  19. GRB 080413: ROTSE-III Detection of Optical Counterpart
  20. GRB 080411: Swift/UVOT refined analysis
  21. GRB 080411, Swift-BAT refined analysis
  22. GRB 080411: Swift-XRT Refined Analysis
  23. Konus-Wind observation of GRB 080411
  24. GRB 080411: VLT redshift
  25. GRB 080411: GROND detection of optical afterglow candidate
  26. GRB080330: MAGIC telescope GeV observation
  27. GRB 080330: Swift-XRT refined position retraction
  28. GRB 080409: Swift-BAT refined analysis
  29. GRB 080408: GROND detection of optical/NIR afterglow candidate
  30. GRB 080330 optical observations
  31. Swift/UVOT observations of GRB080409
  32. GRB 080409: Swift XRT refined analysis
  33. UVOT/Swift Observations of GRB080408
  34. GRB 080408: Swift-XRT position of a possible afterglow
  35. GRB 080409: REM optical/NIR observations
  36. GRB 080408: Analysis of AGILE Gamma-ray data
  37. GRB 080319A: Early RAPTOR optical limits
  38. GRB 080319B: HST observations
  39. GRB 080330: RAPTOR detection of prompt optical flash
  40. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  41. GRB 080405: Swift-BAT refined analysis
  42. GRB 080405: Swift-XRT position
  43. GRB 080325: optical upper limit
  44. GRB 080328: GAO 150cm telescope Optical Observation
  45. GRB080330: Improved Swift XRT Position
  46. GRB 080330: Prompt PROMPT Observations
  47. GRB080330: optical observations
  48. GRB 080319B: TORTORA light curve (Correction)
  49. GRB080328, RIMOTS optical upper limit
  50. GRB080330: optical observations
  51. GRB080330: Swift XRT refined analysis
  52. GRB 080330: REM optical observations
  53. GRB 080330, SMARTS optical/IR afterglow observations
  54. GRB 080330 Swift-UVOT refined analysis
  55. GRB 080328: Suzaku WAM observation of the prompt emission
  56. GRB080330: TNT optical observations
  57. GRB 080330, Swift-BAT refined analysis
  58. Konus-Wind observation of GRB 080328
  59. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  60. GRB080330: LOAO R-band Detection
  61. GRB 080330: GROND Observations
  62. GRB 080330: NOT redshift
  63. GRB 080330A: PAIRITEL Infrared Detections
  64. GRB 080330: error in reported XRT position
  65. GRB 080330: Liverpool Telescope Optical observations
  66. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  67. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  68. GRB 080328: BTA optical imaging and spectroscopy
  69. GRB 080328, Swift-BAT refined analysis
  70. GRB 080328: Swift XRT refined analysis
  71. GRB 080325, Swift-BAT refined analysis
  72. Swift/UVOT observations of GRB080328
  73. GRB080325 - I and z-band Imaging
  74. GRB080328: Faulkes Telescope North observations
  75. GRB 080325: Subaru detection of NIR afterglow candidate
  76. GRB080310, late-time photometry with LBT
  77. GRB 080325: MITSuME Akeno optical upper limits
  78. GRB080325: XRT Refined Analysis
  79. GRB 080325: GROND Observations
  80. GRB080319B: optical observations
  81. GRB 080325: Swift/UVOT Upper Limits
  82. GRB 080319C: Gemini-North spectroscopic redshift
  83. GRB 080325: Early observations from OSN
  84. GRB 080325: NIR afterglow candidate
  85. GRB 080319D: GROND Detection of the Optical Counterpart
  86. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  87. GRB 080319B: Spitzer Mid-infrared Observations
  88. GRB 080319C: Suzaku WAM observation of the prompt emission
  89. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  90. Radio Detection of GRB 080319B
  91. GRB 080320, Swift-BAT refined analysis
  92. GRB 080319D: GROND Observations
  93. GRB 080319B: TORTORA light curve
  94. GRB 080319B: optical upper limit
  95. GRB 080319D: optical upper limit
  96. GRB080319B: Time-Independent XRT Spectrum
  97. GRB 080319D, Swift-BAT refined analysis
  98. GRB 080319C: UVOT Observations
  99. GRB 080319B: UVOT Observations
  100. GRB 080319A: UVOT 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