Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26363 results found.

  1. GRB070509: Swift-XRT Refined Analysis
  2. GRB 070509, Swift-BAT refined analysis
  3. GRB 070508: Suzaku/WAM observation of the prompt emission
  4. GRB 070509: REM observations
  5. GRB070508: Swift/UVOT Observations
  6. GRB 070508, Swift-BAT refined analysis
  7. GRB 070508: REM observations
  8. GRB 070508: TAROT La Silla observatory optical observations
  9. GRB 070508: Swift detection of an intense burst with an optical counterpart
  10. GRB070506: Swift/UVOT Observations
  11. GRB070506: Swift XRT refined analysis
  12. GRB 070506, Swift-BAT Refined Analysis
  13. GRB 070506: Swift detection of a burst with optical afterglow
  14. GRB070429B: VLT observations
  15. GRB070429B: position correction
  16. GRB 070309: Swift-XRT afterglow confirmation
  17. VLA observation of GRB 070429B
  18. Swift/UVOT observations of GRB070429B
  19. GRB 070429B, Swift-BAT refined analysis
  20. Swift/UVOT observations of GRB070429A
  21. GRB 070429A, Swift-BAT refined analysis
  22. GRB 070429A: optical and NIR observations
  23. GRB 070429B: Swift XRT refined analysis
  24. GRB 070429B: ROTSE-III Optical Limits
  25. GRB 070429: ROTSE-III Optical Limits
  26. GRB 070429: Swift detection of a burst
  27. GRB 070427, Swift-BAT Refined Analysis
  28. LT monitoring of GRB070412
  29. GRB 070411: Late-time Keck imaging
  30. GRB070419B: Suzaku WAM observation of the prompt emission
  31. GRB 070420, SMARTS optical/IR afterglow observations
  32. GRB 070411, deep LBT photometry
  33. Konus-Wind observation of GRB 070420
  34. GRB 070411: break in the optical light curve
  35. GRB 070420 Swift-BAT Refined Analysis
  36. GRB 070420: optical rebrightening observed at Mt. John
  37. GRB070420: Swift UVOT continuing observations
  38. GRB 070420: Faulkes Telescope South Observations
  39. GRB 070420: TAROT La Silla observatory optical observations
  40. GRB 070420: NIR and optical afterglow confirmed
  41. GRB 070420: Swift detection of a burst with optical afterglow
  42. GRB 070419A: MITSuME Okayama Observations
  43. GRB 070419A: Early Super-LOTIS Observations
  44. GRB 070419B, Swift-BAT refined analysis
  45. GRB 070419A Swift-BAT Refined Analysis
  46. GRB 070419A, Optical observations
  47. GRB070419 - SDSS Pre-Burst Observations
  48. GRB 070419A: SARA observations
  49. GRB 070419A: NAYUTA Optical Observation
  50. GRB 070419B optical afterglow candidate
  51. GRB 070419A: Optical and IR observations with KANATA
  52. GRB 070419B: optical afterglow candidate
  53. GRB070419A, optical observation
  54. Infrared detection of GRB070419A with UKIRT
  55. GRB 070419A: Kiso Optical observation
  56. GRB 070419: P60 Confirmation of Optical Afterglow
  57. GRB 070419B: Swift detection of a burst
  58. GRB 070419A: ROTSE-III Optical Limits
  59. GRB 070419: Swift detection of a burst
  60. GRB 070418: Optical and IR observations with KANATA
  61. Trigger 276045: Swift detection of a possible burst
  62. GRB 070406: Swift XRT refined analysis
  63. GRB070412: UKIRT-WFCAM JHK upper limits
  64. GRB070412: Swift UVOT observations
  65. GRB 070411: Swift/UVOT observations
  66. GRB 070412, Swift-BAT refined analysis
  67. GRB 070412 Liverpool Telescope optical limit
  68. GRB 070412: Optical observations at Crni Vrh
  69. GRB 070412: further NOT observations
  70. GRB 070412: Gemini/GMOS afterglow candidate
  71. GRB 070412: IAC80 optical afterglow candidate
  72. GRB 070412: NOT observations
  73. GRB 070411, Swift-BAT refined analysis
  74. GRB 070412: Swift detection of a burst
  75. GRB 070411: IAC80 optical observations
  76. GRB 070411 : Liverpool Telescope Observations
  77. GRB 070411: Swift detection of a burst with optical afterglow
  78. GRB 070406: Swift XRT team further analysis
  79. Suzaku ToO observation of SGR 1806-20
  80. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  81. GRB 070406, Swift-BAT refined analysis
  82. GRB 070406: Correction to the optical candidate in GCN6253
  83. GRB 070406: Gemini South Imaging and XRT analysis
  84. GRB070406: Swift UVOT observations
  85. GRB 070406: further analysis of NOT images.
  86. Short GRB 070406 - Possible Bright Host Galaxy
  87. GRB 070406: NOT observations
  88. GRB 070406: Optical candidate
  89. GRB 070406: SARA upper limit
  90. GRB 070406: Xinglong TNT optical Upper Limit
  91. GRB 070402: Suzaku WAM observation of the prompt emission
  92. GRB 070328: Suzaku WAM observation of the prompt emission
  93. UVOT observations of GRB070330
  94. GRB 070330, Swift-BAT refined analysis
  95. GRB 070330: TAROT La Silla observatory optical observations
  96. GRB 070330 - Watcher Observations
  97. GRB 070330: Swift detection of a burst
  98. GRB 070328: Swift/UVOT Upper Limits
  99. long burst from SGR 1806-20 detected on March 26
  100. GRB 070328: 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