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"

35447 results found.

  1. GRB 080319C: Swift detection of a burst with an optical afterglow
  2. GRB 080319C: KAIT OA candidate
  3. GRB 080319A: REM observations
  4. GRB 080319b prompt optical observation by Pi-of-the-Sky
  5. GRB 080319B: Change in power law decay index
  6. GRB 080319B: Gemini-South Spectroscopy
  7. GRB 080319A: optical observations at the NOT
  8. GRB0 080319B : LOAO optical observation
  9. GRB 080319b: Early IR Imaging from PAIRITEL
  10. GRB080319B Liverpool Telescope optical afterglow candidate
  11. GRB 080319B: Super-LOTIS Detection of a Bright OT
  12. GRB 080319B: REM observations
  13. GRB 080319B: KAIT OA
  14. GRB 080319B: UVOT Position
  15. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  16. GRB 080319A: Swift detection of a burst
  17. Swift Trigger 306745 is not a GRB
  18. Swift Trigger 306616 is not a GRB
  19. GRB080310, LBT and MDM photometry
  20. GRB080315: Bok Optical Observations
  21. Swift/UVOT observations of GRB 080315
  22. Swift trigger 306323: Swift-BAT/XRT refined analysis
  23. GRB 080315: Optical observations
  24. GRB 080315: TAROT Calern observatory optical observations
  25. GRB 080315: Swift detection of a possible burst
  26. GRB080310 : Lulin Optical observations
  27. GRB080310, unusual slow decay in the optical
  28. GRB 080310: GAO 150cm telescope Optical Observation
  29. GRB 080310: ROTSE-III Observations of Optical Counterpart
  30. GRB080310: Optical observation by MITSuME telescope
  31. GRB080310, optical observations with the LBT
  32. GRB 080307: GAO 150cm telescope Optical Observation
  33. GRB 080229A: GAO 150cm telescope Optical Observation
  34. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  35. GRB 080307: NIR upper limit
  36. GRB 080229: NIR upper limit
  37. GRB 080310: early RAPTOR multicolor observations
  38. GRB 080310, Swift-BAT refined analysis
  39. GRB080210: optical observations
  40. GRB080307: optical upper limit
  41. GRB 080310: Swift-XRT refined analysis
  42. GRB 080310: Swift/UVOT Refined Analysis
  43. GRB 080310: Redshift from Keck/DEIMOS Spectra
  44. GRB 080310 - SDSS Pre-Burst Observations
  45. GRB 080310: Enhanced Swift-XRT position
  46. GRB 080310: RRM optical photometry with the VLT
  47. GRB080310, detection of break in optical
  48. GRB 080310: VLT/UVES spectroscopy
  49. GRB080310, optical observations with LBT
  50. GRB 080310: Magellan redshift revision
  51. GRB 080310: Lick/Kast Spectroscopy
  52. GRB080310: Super-LOTIS suggestion of brightening
  53. GRB 080310, SMARTS optical/IR afterglow observations
  54. GRB 080310: REM observations
  55. GRB 080310: Magellan redshift
  56. GRB 080310 afterglow candidate (correction to UT time)
  57. GRB 080310: Swift detection of a burst with optical afterglow
  58. GRB 080310 afterglow candidate
  59. GRB 080307: Swift-XRT Team refined analysis
  60. GRB 080307: Swift/UVOT Upper Limits
  61. GRB 080307: Early RAPTOR Limits
  62. GRB 080307, Swift-BAT refined analysis
  63. GRB080307 - SDSS Pre-Burst Observations
  64. GRB 080307: TNT optical observation
  65. GRB080307: Optical upper limits
  66. GRB 080307: Gemini-N i-band observations - candidate afterglow
  67. GRB 080307: BOAO imaging - retraction and new limit
  68. GRB 080307: retraction of UVOT candidate
  69. GRB 080307: Enhanced Swift-XRT position
  70. GRB 080307, Preliminary Swift-BAT refined analysis
  71. GRB 080307 : BOAO optical afterglow observation
  72. GRB 080307: Optical observation with DMC/KANATA
  73. GRB 080307: Swift detection of a burst
  74. VLA possible radio detection of GRB 080229
  75. GRB 080303: Swift/UVOT follow-up of afterglow detection
  76. GRB 080303, Swift-BAT refined analysis
  77. GRB 080303: Rapid PROMPT Detections
  78. GRB080303: Swift XRT refined analysis
  79. GRB 080303: Enhanced Swift-XRT position
  80. GRB080229B: Swift XRT afterglow observation
  81. GRB 080303A: Faulkes Telescope South optical afterglow observations
  82. GRB 080303
  83. GRB 080303: Swift detection of a burst with optical afterglow
  84. GRB 080303: REM NIR afterglow candidate
  85. GRB 080303A: ROTSE-III Optical Limits
  86. GRB 080229: I-band observations from OSN
  87. GRB 080229: VLT NIR observations
  88. GRB080229: Swift XRT refined analysis
  89. GRB 080229: TNG NIR observations
  90. GRB 080229: Deep Gemini/GMOS optical observations
  91. GRB 080229: Enhanced Swift-XRT position
  92. GRB 080229: REM NIR observations
  93. GRB080229: Possible optical afterglow
  94. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  95. UVOT analysis for GRB080229
  96. GRB 080229, Swift-BAT refined analysis
  97. GRB 080229: Faulkes Telescope South optical limit
  98. GRB 080229A: ROTSE-III Optical Limits
  99. GRB 080229: Swift detection of a bright burst
  100. Early optical shallow decay in GRB 071112C

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