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"

26360 results found.

  1. GRB 051113: Swift-BAT refined analysis
  2. GRB051103: Radio Observations
  3. GRB/SGR 050925: XMM-Newton ToO observation
  4. GRB051111: Swift/UVOT Observations
  5. GRB051111: XRT preliminary analysis
  6. GRB 051111: Swift-BAT refined analysis
  7. GRB 051109A Optical Observations
  8. GRB 051111A : Lulin BVRI multi band afterglow observation
  9. GRB051111a: SARA Observations
  10. GRB 051111a: IR photometry
  11. GRB 051109B. Radio Observations
  12. GRB 051109A
  13. GRB051109A - radio observations
  14. GRB 051109B: Swift-BAT refined analysis
  15. GRB 051109A: Swift-UVOT Observations
  16. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  17. GRB051109B: no UVOT source detected
  18. GRB051109B: XRT refined analysis
  19. GRB 051109B : Lulin Optical Observations
  20. GRB 051109A : Lulin BVRI Optical afterglow observation
  21. GRB051109A: further steepening in the X-ray light curve
  22. GRB051109A: XRT refined analysis
  23. GRB 051109B: Super-LOTIS Observations
  24. GRB051105B: REM Optical observation
  25. GRB 051109B: Swift detection of a burst
  26. GRB 051109: Rc and Ic observations
  27. GRB 051109: Swift-BAT refined analysis
  28. GRB 051109a: IR Photometry and Astrometry
  29. GRB051109: Swift detection of a burst
  30. GRB 051109a: IR Detections
  31. GRB051105B: Swift/XRT upper limit
  32. GRB051105B: Swift/UVOT upper limit
  33. GRB051103: MASTER: OT limit and host galaxy candidates
  34. GRB051028: Swift-XRT refined analysis
  35. GRB 051105a, observation from Naini Tal and OSN
  36. GRB 051105a: MDM Observations
  37. GRB 051105A: TNG optical observations
  38. GRB051105A: Swift/UVOT Observations
  39. GRB 051105A, radio observations
  40. GRB051103:_MASTER_optical_observations
  41. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  42. GRB 051105A, optical observations
  43. XRT observations of GRB 051105A
  44. GRB 051105b: ART optical limits
  45. GRB 051105B (INTEGRAL 2701): Optical observation
  46. GRB 051105: Swift detection of a short burst
  47. Recent GRB UBVRcIc field photometry
  48. GRB051028 SARA Observation
  49. GRB051028: optical observations
  50. GRB051028: Swift/UVOT upper limits
  51. GRB051028: Swift XRT Position
  52. GRB051028:MASTER observations
  53. GRB051021B: Swift/UVOT Upper limits
  54. GRB 051021, Optical Observations
  55. GRB 051022: XRT Refined Spectral and Temporal Analysis
  56. GRB051012: Swift-XRT analysis
  57. GRB051021B: Swift XRT refined analysis
  58. GRB 051022, mm counterpart
  59. GRB 051022: Swift/UVOT Upper Limits
  60. GRB051022: Radio Counterpart
  61. GRB051022: IR observations
  62. GRB051021A: Swift XRT refined analysis
  63. GRB051022: Optical Observations
  64. GRB051021b: Magellan IR Imaging
  65. GRB 051021, SMARTS optical/IR observations
  66. GRB051022: Swift XRT Position
  67. GRB 051021: P200 Ks Observations
  68. GRB 051022 (=H3950): SXC Flight Localization is Valid
  69. GRB051021: Swift/UVOT Upper Limits
  70. GRB 051021B: Refined analysis of the Swift-BAT burst
  71. GRB 051022: SSO40 Optical Observations
  72. GRB051022,optical observation
  73. GRB 051021,optical observation
  74. GRB 051021B: Swift detection of a burst
  75. GRB 051021 : optical afterglow observation at Lulin
  76. GRB 051021: Optical observations and candidate afterglow
  77. GRB051021.63
  78. GRB051021.6: MASTER optical observation
  79. GRB051021: A GRB Localized by HETE
  80. Swift-BAT triggered on a posible CR Shower or possible GRB
  81. GRB 051016b: Optical limit
  82. Afterglow candidate of GRB 051016B observed at Lulin
  83. GRB 051016A: Swift/UVOT upper limits
  84. GRB 051016B: refined analysis of the Swift/XRT data
  85. GRB 051016B: Swift/UVOT detection
  86. GRB 051016B,optical observation
  87. GRB 051016B : Optical follow-up at Lulin
  88. GRB 051016B: Refined analysis of the Swift-BAT burst
  89. GRB 051016B: Swift detection of a soft burst
  90. GRB 051016: Swift-BAT refined analysis
  91. GRB051016 XMM-Newton observation
  92. GRB051016: Swift XRT refined analysis.
  93. GRB 051016: PROMPT Observations
  94. GRB051016: Swift detection of a burst
  95. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  96. GRB 051012: Swift-BAT detection of burst yesterday
  97. Swift-BAT Trigger 159578 is a possible burst
  98. GRB 051006: Swift/UVOT Upper Limits
  99. GRB051008: optical candidate
  100. GRB 051008 - a low redshift low-luminosity burst?

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