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"

31637 results found.

  1. GRB 070518, Swift-BAT refined analysis
  2. GRB 070518: OT confirmed form Xinglong TNT observation
  3. GRB070517: Swift-XRT Refined Analysis
  4. GRB 070517, Swift-BAT refined analysis
  5. GRB 070509: objects inside XRT error circle
  6. GRB070419A: optical observations
  7. GRB 070419A, Deep LBT photometry
  8. GRB 070509: Swift/UVOT Upper Limits
  9. Konus-Wind and Konus-A observation of GRB 070508
  10. Swift-BAT trigger 278987 is not a GRB
  11. GRB070509: Swift-XRT Refined Analysis
  12. RHESSI Spectrum of GRB070508
  13. GRB 070508: OA fading and tentative redshift
  14. GRB 070509, Swift-BAT refined analysis
  15. GRB 070508: Suzaku/WAM observation of the prompt emission
  16. GRB 070509: REM observations
  17. GRB 070509: ROTSE-III Optical Limits
  18. GRB070508: Swift/UVOT Observations
  19. GRB 070508, SMARTS optical afterglow observation
  20. GRB 070508, Swift-BAT refined analysis
  21. GRB 070508: Multicolor optical observations and possible redshift limit
  22. GRB 070508: Swift-XRT refined analysis
  23. GRB 070508: Optical observation limiting magnitude
  24. GRB 070508: Optical afterglow detection
  25. GRB 070508: REM observations
  26. GRB070412: MAGIC telescope GeV observation
  27. Swift-BAT trigger 278809 is not a GRB
  28. GRB 070506: VLT redshift
  29. GRB070506: Swift/UVOT Observations
  30. GRB070506: Swift XRT refined analysis
  31. GRB 070506, Swift-BAT Refined Analysis
  32. GRB 070412, deep LBT imaging
  33. GRB 070429A: Swift XRT further analysis
  34. GRB070429B: VLT observations
  35. GRB 070429A: optical observations
  36. GRB070429B: position correction
  37. GRB 070309: Swift-XRT afterglow confirmation
  38. GRB070429B: possible host galaxy detection
  39. VLA observation of GRB 070429B
  40. Swift/UVOT observations of GRB070429B
  41. GRB 070429B, Swift-BAT refined analysis
  42. Swift/UVOT observations of GRB070429A
  43. GRB 070429A: Swift XRT refined analysis
  44. GRB 070429A, Swift-BAT refined analysis
  45. GRB 070429B: Swift XRT refined analysis
  46. GRB 070429B: ROTSE-III Optical Limits
  47. GRB 070429: ROTSE-III Optical Limits
  48. GRB 070427, Swift-BAT Refined Analysis
  49. LT monitoring of GRB070412
  50. GRB 070411, further deep LBT photometry
  51. GRB 070411: Late-time Keck imaging
  52. GRB070419B: Suzaku WAM observation of the prompt emission
  53. GRB 070420, SMARTS optical/IR afterglow observations
  54. GRB 070411, deep LBT photometry
  55. Konus-Wind observation of GRB 070420
  56. GRB 070411: break in the optical light curve
  57. GRB 070420 Swift-BAT Refined Analysis
  58. GRB070419A: Kuiper Optical detection
  59. GRB070419a: Swift UVOT observations
  60. GRB 070419A: MARGE Observations
  61. GRB 070420: optical rebrightening observed at Mt. John
  62. GRB 070420: Swift XRT refined analysis
  63. GRB070420: Swift UVOT continuing observations
  64. GRB 070411: BART early limit
  65. GRB 070420: Faulkes Telescope South Observations
  66. GBR 070419A: Swift/XRT refined analysis
  67. GRB 070420: NIR and optical afterglow confirmed
  68. GRB 070419A: MITSuME Okayama Observations
  69. GRB 070419A: Early Super-LOTIS Observations
  70. GRB 070419B, Swift-BAT refined analysis
  71. GRB 070419A Swift-BAT Refined Analysis
  72. GRB070419B: Confirmation of Optical Transient
  73. GRB 070419A: RAPTOR Detection of Early Emission
  74. GRB 070419B: Swift XRT refined analysis
  75. GRB 070419: Keck/LRIS Absorption Redshift
  76. GRB 070419A, Optical observations
  77. GRB 070411: Deep VLT detection
  78. GRB 070419A: SARA observations
  79. GRB 070419A: NAYUTA Optical Observation
  80. GRB 070419A: Faulkes Telescope North Optical Observations
  81. GRB 070419B optical afterglow candidate
  82. GRB 070419A: Optical and IR observations with KANATA
  83. GRB 070419B: optical afterglow candidate
  84. GRB070419A, optical observation
  85. Infrared detection of GRB070419A with UKIRT
  86. GRB070330: Correction to UVOT position
  87. GRB 070419: P60 Confirmation of Optical Afterglow
  88. GRB 070419 optical afterglow candidate
  89. GRB 070419A: ROTSE-III Optical Limits
  90. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  91. GRB 070418: Optical and IR observations with KANATA
  92. GRB 070406: Swift XRT refined analysis
  93. GRB 070318, SMARTS optical/IR afterglow observations
  94. GRB 070411: TLS data shows plateau, flares
  95. GRB070412: Swift UVOT observations
  96. GRB 070411: Swift/UVOT observations
  97. GRB 070412, Swift-BAT refined analysis
  98. GRB 070412 Liverpool Telescope optical limit
  99. GRB 070411: Optical photometry at Crni Vrh
  100. GRB 070412: Swift-XRT refined analysis

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