Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

27956 results found.

  1. GRB 130216B: Swift/XRT observations
  2. GRB 130216A: Further Swift-BAT refined analysis
  3. GRB 130216B: MASTER-Net early observation
  4. GRB 130216A: MASTER-Net early observations
  5. GRB 130216A: Fermi GBM observation
  6. GRB 130216B: Fermi GBM observation
  7. GRB 130216A: possible early detection at 15 GHz
  8. GRB 130216B BAT refined analysis
  9. GRB 130216A: Swift-BAT refined analysis
  10. GRB 130216A: TAROT La Silla observatory optical observations
  11. GRB 130216B: Burst found in ground analysis of BAT data
  12. GRB 130216A: OSN I-band observations
  13. GRB 130216A: Swift detection of a burst
  14. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  15. GRB 130215A: Fermi GBM detection
  16. GRB 130215A: RAPTOR Measurements
  17. GRB 130215A: Swift-BAT refined analysis
  18. GRB 130215A: TAROT La Silla observatory optical observations
  19. GRB 130215A: CARMA 3mm detection
  20. GRB 130215A: P60 Observations
  21. GRB 130215A: ROTSE-III data analysis
  22. Skynet Observations of GRB130215
  23. GRB 130215: ROTSE-III Detection of Optical Counterpart
  24. GRB 130215A: Swift detection of a burst
  25. Swift GRB130206A: late XRT observations.
  26. GRB 130131B: CTIO 0.9-m optical upper-limits
  27. GRB 121128A: optical observations
  28. GRB 121123A: optical observations
  29. GRB 130211A: Swift/UVOT Upper Limits
  30. GRB 130211A: Swift-XRT refined Analysis
  31. GRB 130211A: Swift-BAT refined analysis
  32. GRB 130211A: GROND detection of the afterglow
  33. GRB 130211A: Swift detection of a burst
  34. GRB 130122A: PTF P48 optical upper limits
  35. GRB 130206A: GROND Observations
  36. GRB 130206A: Fermi LAT Observations
  37. GRB 130206A: Fermi GBM observation
  38. GRB 130206A: XRT and UVOT follow-up observations.
  39. GRB 130131B: optical upper limit in Mondy observatory
  40. GRB 130206A, Swift-BAT refined analysis
  41. GRB 130206A: Zadko observatory - Gingin optical observations
  42. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  43. GRB 130206A: Swift-XRT observations
  44. GRB 130131A: optical observation in Mondy observatory
  45. GRB 130206A: Swift detection of a burst
  46. GRB 130131A: Swift/UVOT Upper Limits
  47. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  48. GRB 130131B: Swift-XRT refined Analysis
  49. GRB 130131A - UKIRT confirmation of afterglow
  50. GRB 130131B: VLT/X-shooter acquisition camera limits
  51. GRB 130131B: GROND Upper limits
  52. GRB 130131A: CARMA 3mm Observations
  53. GRB 130131A: VLA 5.8 Ghz Detection
  54. GRB 130131B: IAC80 I-band observations
  55. GRB 130131B: Swift/UVOT Upper Limits
  56. GRB 130131A: Swift-XRT refined Analysis
  57. GRB 130131B: Enhanced Swift-XRT position
  58. GRB 130131B: Swift-BAT refined analysis
  59. GRB 130131A: Swift-BAT refined analysis
  60. GRB 130131B: TAROT Calern observatory optical observations
  61. GRB 130131B: Zadko observatory - Gingin optical observations
  62. GRB 130131A: Enhanced Swift-XRT position
  63. GRB 130131B: Swift detection of a burst
  64. GRB 130131A - Faulkes Telescope North Observations
  65. GRB 130131A: Swift detection of a burst
  66. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  67. GRB 130127A: Fermi GBM detection
  68. Swift Trigger 547142: MAXI/GSC upper limit
  69. Swift Trigger 547142: a probable Galactic source
  70. GRB 130122A: CARMA 3mm Observations
  71. GRB 130122A: Swift/UVOT Detection
  72. GRB 130122A: RATIR Detection
  73. GRB 130122A: Swift-BAT refined analysis
  74. GRB 130122A: Swift-XRT refined Analysis
  75. GRB 130122A: Enhanced Swift-XRT position
  76. GRB 130122A: MASTER-Net early marginal detection of the OT
  77. GRB 130122A: T100 observations
  78. GRB 130122A: Swift detection of a burst with an optical counterpart
  79. Short GRB 121226A: TNG observation of the host galaxy
  80. GRB 121225B: Suzaku WAM observation of the prompt emission
  81. GRB 130102A: Swift/UVOT Upper Limits
  82. GRB 130102A: P60 Observations
  83. GRB 130102A: Swift-BAT refined analysis
  84. GRB 130102A: MASTER-Net optical observations
  85. GRB 130102A: Swift-XRT refined Analysis
  86. GRB 130102B: MAXI/GSC detection
  87. GRB 130102A: Enhanced Swift-XRT position
  88. GRB 130102A: IAC80 I-band observations
  89. GRB 130102A: Swift detection of a burst
  90. Swift Trigger 544381 is a noise event
  91. GRB 121229A: Swift-XRT refined Analysis
  92. GRB 121229A, Swift-BAT refined analysis
  93. GRB 121229A: Swift/UVOT Upper Limits
  94. GRB 121229A: Enhanced Swift-XRT position
  95. Swift Trigger 544381 is unlikely to be a GRB
  96. GRB 121229A: MAXI/GSC detection
  97. GRB 121229A: GROND detection of the afterglow
  98. GRB 121229A: Swift detection of a burst
  99. GRB 121226A: Swift/UVOT Upper Limits
  100. GRB 121226A: Swift-XRT refined Analysis

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