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"

32769 results found.

  1. GRB 060323 : WIDGET simultaneous optical observations
  2. GRB 060323: Early optical observation at Xinglong
  3. GRB060218, optical observations
  4. GRB 060322: Confirmation of Swift XRT afterglow
  5. GRB 060211A: optical observation
  6. GRB060323: optical limit
  7. GRB060211B: optical observation
  8. SGR 1900+14: CORRECTION to GCN 4923
  9. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  10. GRB060323: NOT optical observations
  11. GRB 060322: Swift XRT afterglow candidate
  12. GRB060323: P60 Observations
  13. GRB 060323: Swift/UVOT Observations
  14. GRB 060323: optical afterglow confirmed
  15. GRB060323: NOT observations
  16. GRB 060323: Optical Observations
  17. GRB 060323: Tautenburg OT candidate retraction
  18. GRB 060323: Refined analysis of the Swift-BAT burst
  19. GRB 060323: optical observations at TNG
  20. GRB 060323: Swift XRT refined analysis
  21. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  22. GRB 060323: Swift/XRT position
  23. GRB 060322: Refined analysis of the Swift-BAT burst
  24. GRB060323, optical observation
  25. GRB060206: optical observation
  26. GRB060218/SN2006aj: optical observations
  27. GRB 060218/SN 2006aj, LNA optical observation
  28. GRB060218: Refined photometric calibration of comparison stars
  29. GRB 060319: WHT K-band candidate afterglow
  30. GRB060319: Swift XRT refined analysis
  31. GRB060319: Swift/UVOT upper limits
  32. GRB 060319: Re-analysis of TNG data
  33. GRB060319: MASTER limit
  34. GRB 060319: Swift-BAT refined analysis
  35. GRB 060319 optical observations at TNG
  36. GRB060319 : Liverpool Telescope optical limit
  37. GRB060319 - SDSS Pre-burst Observations
  38. GRB060319: Swift/XRT position
  39. GRB060313: Radio Observations
  40. GRB 060313: early afterglow NIR upper limits with REM
  41. Konus-Wind observation of GRB 060313
  42. GRB060313: SSO 40inch Observations
  43. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  44. GRB 060313: PROMPT Observations
  45. GRB 060313: Swift/UVOT Observations
  46. GRB060313:Gemini South Observations
  47. GRB 060313: Swift-XRT team refined analysis
  48. GRB060313: optical observations of the afterglow candidate
  49. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  50. GRB 060313, SMARTS optical counterpart?
  51. GRB 060313: Possible optical counterpart
  52. GRB 060313: Swift XRT position
  53. GRB 060313, SMARTS optical/IR observations
  54. GRB060313: optical and near infrared observations with REM
  55. GRB060218: SARA Observations of SN2006aj
  56. GRB 060312: Refined analysis of the Swift-BAT burst
  57. GRB 060312: Swift XRT team refined analysis
  58. GRB060306: APO Ks-band Imaging Observations
  59. GRB 060312: ROTSE-III Optical Limits
  60. GRB 060306: SOAR Ks Observations
  61. GRB 060306: MAGNUM observations
  62. Swift/UVOT observations of GRB060306
  63. GRB 060306: Swift-BAT refined analysis
  64. GRB 060306: Swift-XRT team refined analysis
  65. GRB 060306: PROMPT Observations
  66. GRB 060218: RTT150 optical observations
  67. GRB060218: Ep,i - Eiso correlation
  68. GRB060223b: optical limit
  69. GRB060218/SN 2006aj: optical observation in V
  70. GRB060218/SN 2006aj: optical observation
  71. GRB 060121: HST observations
  72. GRB 060218 : GMRT observation [Correction and Improvement]
  73. GRB 060223b: Swift/UVOT Upper Limits
  74. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  75. GRB 060223B: Swift XRT possible afterglow
  76. GRB 060218/SN 2006aj: ABT observations
  77. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  78. GRB 060218 : Radio upper limits from GMRT
  79. GRB 060218/SN 2006aj: WIRO optical observations
  80. GRB 060218/SN 2006aj: RBO optical observations
  81. GRB 060204B: GETS early limit
  82. GRB 060218: Refined analysis of the radio afterglow
  83. GRB 060223B: ART optical limits
  84. GRB 060223B: Swift-BAT refined analysis
  85. GRB 060223a: Swift/UVOT refined analysis
  86. GRB 060223: Swift XRT Team preliminary analysis
  87. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  88. GRB 060223B: Swift detection of a bright burst
  89. GRB 060223: Swift-BAT refined analysis
  90. Correction to GCN 4816 on GRB060218
  91. GRB 060218/SN 2006aj: optical observations
  92. GRB060218: Optical brightening in V and R
  93. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  94. Spectral properties of GRB060218/SN2006aj
  95. GRB 060219: Swift-BAT refined analysis
  96. GRB 060218: rebrightening
  97. GRB 060218: emergence of the underlying SN spectrum
  98. GRB 060218: Decline in r-band flux
  99. GRB 060218: spectroscopic observations
  100. GRB 060218: Further refined analysis of the Swift-BAT burst

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