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"

36947 results found.

  1. Swift trigger 306323: Swift-BAT/XRT refined analysis
  2. SAX J1818.6-1703: Swift detection (trigger 306379)
  3. GRB 080315: Optical observations
  4. GRB 080315: TAROT Calern observatory optical observations
  5. GRB 080315: Swift detection of a possible burst
  6. GRB080310 : Lulin Optical observations
  7. GRB080310, unusual slow decay in the optical
  8. GRB 080310: GAO 150cm telescope Optical Observation
  9. GRB 080310: ROTSE-III Observations of Optical Counterpart
  10. GRB080310: Optical observation by MITSuME telescope
  11. GRB080310, optical observations with the LBT
  12. GRB 080307: GAO 150cm telescope Optical Observation
  13. GRB 080229A: GAO 150cm telescope Optical Observation
  14. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  15. GRB 080307: NIR upper limit
  16. GRB 080229: NIR upper limit
  17. GRB 080310: early RAPTOR multicolor observations
  18. GRB 080310, Swift-BAT refined analysis
  19. GRB080210: optical observations
  20. GRB080307: optical upper limit
  21. GRB 080310: Swift-XRT refined analysis
  22. GRB 080310: Swift/UVOT Refined Analysis
  23. GRB 080310: Redshift from Keck/DEIMOS Spectra
  24. GRB 080310 - SDSS Pre-Burst Observations
  25. GRB 080310: Enhanced Swift-XRT position
  26. GRB 080310: RRM optical photometry with the VLT
  27. GRB080310, detection of break in optical
  28. GRB 080310: VLT/UVES spectroscopy
  29. GRB080310, optical observations with LBT
  30. GRB 080310: Magellan redshift revision
  31. GRB 080310: Lick/Kast Spectroscopy
  32. GRB080310: Super-LOTIS suggestion of brightening
  33. GRB 080310, SMARTS optical/IR afterglow observations
  34. GRB 080310: REM observations
  35. GRB 080310: Magellan redshift
  36. GRB 080310 afterglow candidate (correction to UT time)
  37. GRB 080310: Swift detection of a burst with optical afterglow
  38. GRB 080310 afterglow candidate
  39. GRB080229, optical upper limit (Correction)
  40. GRB080307, optical upper limit
  41. GRB080229, optical upper limit
  42. GRB 080307: Swift-XRT Team refined analysis
  43. GRB 080307: Swift/UVOT Upper Limits
  44. GRB 080307: Early RAPTOR Limits
  45. GRB 080307, Swift-BAT refined analysis
  46. GRB080307 - SDSS Pre-Burst Observations
  47. GRB 080307: TNT optical observation
  48. GRB080307: Optical upper limits
  49. GRB 080307: Gemini-N i-band observations - candidate afterglow
  50. GRB 080307: BOAO imaging - retraction and new limit
  51. GRB 080307: retraction of UVOT candidate
  52. GRB 080307: Enhanced Swift-XRT position
  53. GRB 080307, Preliminary Swift-BAT refined analysis
  54. GRB 080307 : BOAO optical afterglow observation
  55. GRB 080307: Optical observation with DMC/KANATA
  56. GRB 080307: Swift detection of a burst
  57. VLA possible radio detection of GRB 080229
  58. GRB 080303: Swift/UVOT follow-up of afterglow detection
  59. GRB 080303, Swift-BAT refined analysis
  60. GRB 080303: Rapid PROMPT Detections
  61. GRB080303: Swift XRT refined analysis
  62. GRB 080303: Enhanced Swift-XRT position
  63. Swift UVOT observations of GRB080229B
  64. GRB080229B: Swift XRT afterglow observation
  65. GRB 080303A: Faulkes Telescope South optical afterglow observations
  66. GRB 080303
  67. GRB 080303: Swift detection of a burst with optical afterglow
  68. GRB 080303: REM NIR afterglow candidate
  69. GRB 080303A: ROTSE-III Optical Limits
  70. GRB 080229: I-band observations from OSN
  71. GRB 080229: VLT NIR observations
  72. GRB080229: Swift XRT refined analysis
  73. GRB 080229: TNG NIR observations
  74. GRB 080229: Deep Gemini/GMOS optical observations
  75. GRB 080229: Enhanced Swift-XRT position
  76. GRB 080229: REM NIR observations
  77. GRB080229: Possible optical afterglow
  78. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  79. UVOT analysis for GRB080229
  80. GRB 080229, Swift-BAT refined analysis
  81. GRB 080229: Faulkes Telescope South optical limit
  82. GRB 080229A: ROTSE-III Optical Limits
  83. GRB 080229: Swift detection of a bright burst
  84. Early optical shallow decay in GRB 071112C
  85. GRB080207: optical observations
  86. GRB080205: optical observations
  87. GRB080211: optical observations
  88. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  89. GRB 071010B : Early optical brightening detected by TAOS
  90. Swift-XRT improved positions, and new redshift limits.
  91. ESO optical and NIR observations of GRB 080218B
  92. GRB 080204: Suzaku WAM observation of the prompt emission
  93. GRB 080218B, Swift-BAT refined analysis
  94. GRB 080218B: Swift-XRT refined analysis
  95. Swift/UVOT observations of GRB080218B
  96. GRB 080218B: REM NIR early upper limits
  97. GRB 080212: Mount Abu NIR observations
  98. GRB 080218B: Enhanced Swift-XRT position
  99. GRB 080218B: GROND upper limits
  100. GRB 080218b, SMARTS optical/IR limits

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