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"

28117 results found.

  1. GRB 051221B: TAROT optical limits
  2. GRB 051221B: Refined analysis of the Swift-BAT burst
  3. GRB 051221B: BOOTES optical observations.
  4. Swift-BAT detection of a possible burst
  5. GRB 051221: Swift XRT refined analysis
  6. GRB 051221: Swift/UVOT upper limits
  7. GRB 051221: No variability in Gemini data
  8. GRB 051221: Improved astrometry of the IR counterpart
  9. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  10. GRB 051221: Swift detection of a bright short burst
  11. Swift detection of an RS CVn flare star
  12. GRB051211A: possible optical candidate
  13. GRB 051215: near-infrared observations
  14. GRB051215 - SDSS pre-burst observations
  15. GRB 051215: Swift detection of a possible burst
  16. GRB051105: optical observations
  17. GRB 051213: Swift-BAT refined analysis
  18. GRB051211B: XRT refined analysis
  19. GRB 051211B, optical observation
  20. GRB 051211A: Swift/UVOT upper limits
  21. GRB 051211B: Swift/UVOT upper limits
  22. GRB 051211A,optical observation
  23. GRB051211B: Liverpool Telescope observation
  24. GRB051211b: P60 Observations
  25. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  26. GRB 051210: Swift/UVOT upper limits
  27. GRB 051210: Magellan Imaging
  28. GRB 051211: TAROT optical limits
  29. GRB 051211B: a possible optical detection by TAROT
  30. GRB 051211:IAC80 optical observations
  31. GRB 051210: SALT detection limit
  32. GRB 051210: Swift XRT refined analysis
  33. GRB 051210: FRAM early limit
  34. GRB 051210: Swift-BAT refined analysis of a short burst
  35. GRB051210: Swift UVOT Observation
  36. GRB 051210: Swift detection of a burst
  37. An extraordinary long burst on December 3 from SGR1806-20
  38. Possible resuming of the SGR 1806-20 activity
  39. GRB051117B: Swift XRT refined analysis
  40. GRB051117b: No Swift/UVOT Detection
  41. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  42. GRB 051117A: Swift/UVOT Detection of an Afterglow
  43. GRB051111: Suzaku WAM observation of the prompt emission
  44. GRB051008: Suzaku WAM observation of the prompt emission
  45. GRB 051117B: R and I observations of possible host galaxy
  46. GRB 051117A: Refined analysis of the Swift-BAT burst
  47. GRB 051117B: Refined analysis of the Swift-BAT burst
  48. GRB 051117B,optical observation
  49. GRB 051117B: Lulin R and I band observation
  50. GRB051114: results of the Swift-XRT observation
  51. GRB 051109B : Nainital upper limits
  52. GRB 051114: Radio Observations
  53. GRB 051114: Swift-BAT refined analysis
  54. GRB050925: analysis of the XMM-Newton observation
  55. GRB 051114: Swift-BAT detection of a short burst
  56. GRB 051111: Further spectroscopic analysis
  57. GRB 051111: Radio afterglow
  58. GRB 051113: Swift-BAT refined analysis
  59. GRB051103: Radio Observations
  60. GRB/SGR 050925: XMM-Newton ToO observation
  61. GRB051111: Swift/UVOT Observations
  62. GRB051111: XRT preliminary analysis
  63. GRB 051111: Swift-BAT refined analysis
  64. GRB 051109A Optical Observations
  65. GRB 051111A : Lulin BVRI multi band afterglow observation
  66. GRB051111a: SARA Observations
  67. GRB 051111a: IR photometry
  68. GRB 051109B. Radio Observations
  69. GRB 051109A
  70. GRB051109A - radio observations
  71. GRB 051109B: Swift-BAT refined analysis
  72. GRB 051109A: Swift-UVOT Observations
  73. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  74. GRB051109B: no UVOT source detected
  75. GRB051109B: XRT refined analysis
  76. GRB 051109B : Lulin Optical Observations
  77. GRB 051109A : Lulin BVRI Optical afterglow observation
  78. GRB051109A: further steepening in the X-ray light curve
  79. GRB051109A: XRT refined analysis
  80. GRB 051109B: Super-LOTIS Observations
  81. GRB051105B: REM Optical observation
  82. GRB 051109B: Swift detection of a burst
  83. GRB 051109: Rc and Ic observations
  84. GRB 051109: Swift-BAT refined analysis
  85. GRB 051109a: IR Photometry and Astrometry
  86. GRB051109: Swift detection of a burst
  87. GRB 051109a: IR Detections
  88. GRB051105B: Swift/XRT upper limit
  89. GRB051105B: Swift/UVOT upper limit
  90. GRB051103: MASTER: OT limit and host galaxy candidates
  91. GRB051028: Swift-XRT refined analysis
  92. GRB 051105a, observation from Naini Tal and OSN
  93. GRB 051105a: MDM Observations
  94. GRB 051105A: TNG optical observations
  95. GRB051105A: Swift/UVOT Observations
  96. GRB 051105A, radio observations
  97. GRB051103:_MASTER_optical_observations
  98. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  99. GRB 051105A, optical observations
  100. XRT observations of GRB 051105A

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