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"

23618 results found.

  1. GRB 060526: Magellan Redshift
  2. GRB 060526: TNG optical observations
  3. GRB060526 - SDSS Pre-burst Observations
  4. GRB 060526: Continued emission for the Swift burst
  5. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  6. GRB 060413 : WIDGET simultaneous optical observations
  7. GRB060512: Late-Time P200 Observations
  8. GRB060522: z = 5.11 Keck-LRIS Redshift
  9. GRB 060522: Swift/XRT Team refined analysis
  10. GRB 060522: Swift-BAT Refined Analysis
  11. GRB 060522: TNG optical observations
  12. GRB 060522: Swift detection of a burst with possible optical afterglow
  13. GRB 060512: reanalysis of optical spectra
  14. GRB 060516: Refined analysis of the Swift-BAT burst
  15. GRB 060512: TNG optical spectroscopy
  16. GRB 060516: Swift detection of a burst
  17. GRB 060505 BAT refined analysis
  18. GRB 060515 BAT refined analysis
  19. GRB 060512: TAROT optical observation
  20. GRB060515: Swift/UVOT initial observation
  21. GRB 060515: TAROT optical observation
  22. GRB 060515: Swift detection of a burst
  23. Swift/UVOT observations of GRB060512.
  24. GRB 060512: Subaru NIR observation
  25. GRB060512: Swift XRT Team refined analysis
  26. GRB 060512: Detection of NIR afterglow
  27. GRB 060512: Swift-BAT Refined Analysis
  28. GRB 060505 - OT candidate + galaxy spectrum
  29. GRB 060512: optical decay
  30. GRB060512 - SDSS Pre-Burst Observations
  31. GRB060512 Name Correction: LT Afterglow detection
  32. GRB060512: Liverpool Telescope Afterglow detection
  33. GRB 060512: Swift detection of a burst with an optical afterglow
  34. GRB 060505: X-ray afterglow - Correction -
  35. GRB 060505: X-ray afterglow
  36. Konus-Wind observation of GRB 060510A
  37. GRB060418: optical observations
  38. GRB060510B: Swift XRT refined analysis
  39. GRB 060510A: Refined analysis of the Swift-BAT burst
  40. GRB 060510B: Swift-BAT Refined Analysis
  41. GRB060510A: XRT refined analysis
  42. GRB060510 - SDSS Pre-Burst Observations
  43. GRB060510B : Faulkes North Telescope detection
  44. GRB 060510B: Super-LOTIS Observations
  45. GRB 060510B: Swift detection of a burst
  46. GRB 060510: Swift detection of a burst with optical transient
  47. GRB 060507: Final Refined analysis of the Swift-BAT burst
  48. GRB 060507: Swift-BAT Refined Analysis
  49. GRB 060505: PROMPT Observations
  50. GRB 060507: Swift/UVOT Upper Limits
  51. GRB 060507: Swift XRT Team Refined Analysis
  52. GRB060507: Swift XRT position
  53. GRB 060507: Swift detection of a burst
  54. GRB 060429: Suzaku WAM observation
  55. GRB060505: Swift/UVOT Observations
  56. GRB 060505: Swift XRT Team Refined Analysis
  57. GRB060425: new MASTER survey method
  58. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  59. GRB 060505: Swift XRT afterglow canditate position
  60. GRB 060505: Swift-BAT detection of a weak burst
  61. GRB 060428B: spectroscopy
  62. GRB060502A, optical observation
  63. GRB 060502B: Swift/UVOT upper limits
  64. GRB 060502A: Swift/UVOT source detection
  65. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  66. GRB 060502B: Refined analysis of the Swift-BAT short burst
  67. GRB 060427B Milagro GeV/TeV Observations
  68. GRB 060502A: TTT Observations
  69. GRB 060502B: Swift detection of a short burst
  70. GRB 060502: Swift-BAT refined analysis
  71. GRB 060502: APO Spectroscopic Observations
  72. GRB060502: Super-LOTIS Observations
  73. GRB 060502: Swift detection of a burst with an optical counterpart
  74. GRB 060501: Refined analysis of the Swift-BAT burst
  75. GRB 060501: Swift detection of a burst
  76. IPN triangulation of GRB060429 (short/hard)
  77. Konus-Wind observation of GRB 060427B
  78. GRB060428B - SDSS Pre-Burst Observations
  79. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  80. GRB 060428A: PROMPT Observations
  81. GRB 060427B: MASTER optical observations
  82. GRB 060427B: IPN localization of a short hard burst
  83. GRB 060428B: Refined analysis of the Swift-BAT burst
  84. GRB 060428B: KAIT observations
  85. GRB060428A: Swift/UVOT observations.
  86. GRB 060428A: Refined analysis of the Swift-BAT burst
  87. GRB060428A: Swift XRT Team refined analysis
  88. GRB 060428B: Swift detection of a burst
  89. GRB 060428: Swift detection of a burst
  90. GRB 060427: NOT observations
  91. GRB 060427: Swift/UVOT upper limits.
  92. GRB 060427: Swift detection of a burst
  93. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  94. GRB 060424: Swift detection of a burst
  95. GRB 060421: TTT Observations
  96. Swift-BAT detection of Mrk 421
  97. GRB060421: Swift/UVOT observations
  98. GRB 060421: Swift-BAT Refined Analysis
  99. GRB060418: optical observations
  100. Konus-Wind observation of GRB 060418

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