Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36235 results found.

  1. GRB 051213: Swift-BAT detection of a burst
  2. GRB 051211a: RTT150 optical observations
  3. GRB051211B, RBO optical observations
  4. GRB 051211A: Swift/UVOT upper limits
  5. GRB 051211B: Swift/UVOT upper limits - correction
  6. GRB 051211B: Swift/UVOT upper limits
  7. GRB 051211A,optical observation
  8. GRB 051211B: Swift XRT confirmation of the afterglow
  9. GRB051211B: Liverpool Telescope observation
  10. GRB 051211b: RTT150 optical observations
  11. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  12. GRB 051211B: Swift XRT Observations
  13. GRB 051210: Swift/UVOT upper limits
  14. GRB 051210: Magellan Imaging
  15. GRB 051211: TAROT optical limits
  16. GRB 051211B: a possible optical detection by TAROT
  17. GRB 051211B: a long GRB detected by INTEGRAL
  18. GRB 051211: Swift XRT upper limit
  19. GRB 051211:IAC80 optical observations
  20. HETE SXC localization of GRB 051211 (=H3979)
  21. GRB 051210: Optical imaging from Las Campanas
  22. GRB 051210: SALT detection limit
  23. GRB 051210: BAT further refined analysis of the short burst
  24. GRB 051210: Swift XRT refined analysis
  25. GRB 051210: FRAM early limit
  26. GRB 051210: Swift-BAT refined analysis of a short burst
  27. GRB 051210: A short GRB in a cluster?
  28. GRB 051210: Swift detection of a burst
  29. IPN observations of SGR1806-20
  30. An extraordinary long burst on December 3 from SGR1806-20
  31. IBAS Alert 2706 : not a real GRB
  32. GRB051117B: optical observation
  33. GRB051111: optical observaion
  34. Swift-BAT trigger 165579 is not a GRB
  35. GRB 051127: Swift-BAT detection of a possible burst
  36. GRB051117b: No Swift/UVOT Detection
  37. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  38. GRB 051117A: Swift/UVOT Detection of an Afterglow
  39. GRB051111: Suzaku WAM observation of the prompt emission
  40. GRB051008: Suzaku WAM observation of the prompt emission
  41. GRB 051109B: GAO 150cm telescope Optical limit
  42. GRB 051109A : GAO 150cm telescope Rc-band detection
  43. GRB 051021 Optical Observations
  44. GRB 051117B: MARGE Optical Limits
  45. GRB 051117A and B: Radio Observations
  46. GRB 051117B: R and I observations of possible host galaxy
  47. GRB 051117b: NIR observations
  48. GRB 051117A: Refined analysis of the Swift-BAT burst
  49. GRB 051117B: Refined analysis of the Swift-BAT burst
  50. GRB 051117B,optical observation
  51. GRB 051117B: Lulin R and I band observation
  52. GRB 051117B: Optical observations
  53. GRB 051117B: ROTSE-III Optical Limits
  54. GRB 051117B: Swift detection of a burst
  55. GRB 051117: Swift detection of a bright burst
  56. GRB 051028 Optical Observations
  57. GRB 051109B : Nainital upper limits
  58. GRB 051114: Radio Observations
  59. GRB 051114: Swift-BAT refined analysis
  60. GRB051109A optical observations
  61. GRB 051114: Swift-BAT detection of a short burst
  62. GRB 051111: Further spectroscopic analysis
  63. GRB 051111: Radio afterglow
  64. GRB 051113: Swift-BAT refined analysis
  65. GRB 051113: Swift-BAT detection of a burst
  66. GRB 051111: AEOS optical observations
  67. GRB051103: Radio Observations
  68. GRB 051109A Milagro GeV/TeV Observations
  69. GRB/SGR 050925: XMM-Newton ToO observation
  70. GRB051111: Swift/UVOT Observations
  71. GRB 051111A : R-band temporal decay index based on Lulin
  72. GRB 051111: Swift-BAT refined analysis
  73. GRB 051109A Optical Observations
  74. GRB 051111A : Lulin BVRI multi band afterglow observation
  75. GRB051111a: SARA Observations
  76. GRB 051111a: IR photometry
  77. GRB 051111: Keck HIRES redshift
  78. GRB 051111A: KAIT optical observations
  79. GRB 051111a: Afterglow fading in Ic
  80. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  81. GRB 051103 Milagro GeV/TeV Observations
  82. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  83. GRB 051008 Tautenburg Supernova Search
  84. GRB 051109B. Radio Observations
  85. GRB 051109A
  86. GRB051109A - radio observations
  87. GRB 051105a: GETS optical limit
  88. GRB 051109b: GETS observation
  89. GRB 051109A: KAIT optical observations
  90. Early RAPTOR measurements of GRB 051109a - the movie.
  91. Konus-Wind observation of GRB 051109A
  92. GRB 051109B: Swift-BAT refined analysis
  93. GRB 051109B: ROTSE-III Optical Limits
  94. GRB 051109A: Swift-UVOT Observations
  95. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  96. GRB 051109B : Lulin Optical Observations
  97. GRB 051109A : Lulin BVRI Optical afterglow observation
  98. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  99. GRB051109B: XRT position
  100. GRB 051109B: Super-LOTIS 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