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"

28055 results found.

  1. GRB 051111: Swift-BAT refined analysis
  2. GRB 051109A Optical Observations
  3. GRB 051111A : Lulin BVRI multi band afterglow observation
  4. GRB051111a: SARA Observations
  5. GRB 051111a: IR photometry
  6. GRB 051109B. Radio Observations
  7. GRB 051109A
  8. GRB051109A - radio observations
  9. GRB 051109B: Swift-BAT refined analysis
  10. GRB 051109A: Swift-UVOT Observations
  11. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  12. GRB051109B: no UVOT source detected
  13. GRB051109B: XRT refined analysis
  14. GRB 051109B : Lulin Optical Observations
  15. GRB 051109A : Lulin BVRI Optical afterglow observation
  16. GRB051109A: further steepening in the X-ray light curve
  17. GRB051109A: XRT refined analysis
  18. GRB 051109B: Super-LOTIS Observations
  19. GRB051105B: REM Optical observation
  20. GRB 051109B: Swift detection of a burst
  21. GRB 051109: Rc and Ic observations
  22. GRB 051109: Swift-BAT refined analysis
  23. GRB 051109a: IR Photometry and Astrometry
  24. GRB051109: Swift detection of a burst
  25. GRB 051109a: IR Detections
  26. GRB051105B: Swift/XRT upper limit
  27. GRB051105B: Swift/UVOT upper limit
  28. GRB051103: MASTER: OT limit and host galaxy candidates
  29. GRB051028: Swift-XRT refined analysis
  30. GRB 051105a, observation from Naini Tal and OSN
  31. GRB 051105a: MDM Observations
  32. GRB 051105A: TNG optical observations
  33. GRB051105A: Swift/UVOT Observations
  34. GRB 051105A, radio observations
  35. GRB051103:_MASTER_optical_observations
  36. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  37. GRB 051105A, optical observations
  38. XRT observations of GRB 051105A
  39. GRB 051105b: ART optical limits
  40. GRB 051105B (INTEGRAL 2701): Optical observation
  41. GRB 051105: Swift detection of a short burst
  42. Recent GRB UBVRcIc field photometry
  43. GRB051028 SARA Observation
  44. GRB051028: optical observations
  45. GRB051028: Swift/UVOT upper limits
  46. GRB051028: Swift XRT Position
  47. GRB051028:MASTER observations
  48. GRB051021B: Swift/UVOT Upper limits
  49. GRB 051021, Optical Observations
  50. GRB 051022: XRT Refined Spectral and Temporal Analysis
  51. GRB051012: Swift-XRT analysis
  52. GRB051021B: Swift XRT refined analysis
  53. GRB 051022, mm counterpart
  54. GRB 051022: Swift/UVOT Upper Limits
  55. GRB051022: Radio Counterpart
  56. GRB051022: IR observations
  57. GRB051021A: Swift XRT refined analysis
  58. GRB051022: Optical Observations
  59. GRB051021b: Magellan IR Imaging
  60. GRB 051021, SMARTS optical/IR observations
  61. GRB051022: Swift XRT Position
  62. GRB 051021: P200 Ks Observations
  63. GRB 051022 (=H3950): SXC Flight Localization is Valid
  64. GRB051021: Swift/UVOT Upper Limits
  65. GRB 051021B: Refined analysis of the Swift-BAT burst
  66. GRB 051022: SSO40 Optical Observations
  67. GRB051022,optical observation
  68. GRB 051021,optical observation
  69. GRB 051021B: Swift detection of a burst
  70. GRB 051021 : optical afterglow observation at Lulin
  71. GRB 051021: Optical observations and candidate afterglow
  72. GRB051021.63
  73. GRB051021.6: MASTER optical observation
  74. GRB051021: A GRB Localized by HETE
  75. Swift-BAT triggered on a posible CR Shower or possible GRB
  76. GRB 051016b: Optical limit
  77. Afterglow candidate of GRB 051016B observed at Lulin
  78. GRB 051016A: Swift/UVOT upper limits
  79. GRB 051016B: refined analysis of the Swift/XRT data
  80. GRB 051016B: Swift/UVOT detection
  81. GRB 051016B,optical observation
  82. GRB 051016B : Optical follow-up at Lulin
  83. GRB 051016B: Refined analysis of the Swift-BAT burst
  84. GRB 051016B: Swift detection of a soft burst
  85. GRB 051016: Swift-BAT refined analysis
  86. GRB051016 XMM-Newton observation
  87. GRB051016: Swift XRT refined analysis.
  88. GRB 051016: PROMPT Observations
  89. GRB051016: Swift detection of a burst
  90. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  91. GRB 051012: Swift-BAT detection of burst yesterday
  92. Swift-BAT Trigger 159578 is a possible burst
  93. GRB 051006: Swift/UVOT Upper Limits
  94. GRB051008: optical candidate
  95. GRB 051008 - a low redshift low-luminosity burst?
  96. GRB051011: bright nebulae near error box
  97. GRB051011: MASTER optical observation
  98. GRB051008: Final refined analysis of the Swift-BAT burst
  99. GRB051008: Radio Observation
  100. GRB 051008, optical 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