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"

23687 results found.

  1. GRB 091130: Swift detection of a possible burst
  2. Konus-Wind observation of GRB 091127
  3. GRB 091127: TAROT La Silla observatory optical observations
  4. GRB 091127: optical observations
  5. GRB 091127: LABOCA/APEX submm observations
  6. GRB 091127: TAROT La Silla observatory optical decay
  7. GRB 091127: CAHA 1.23m I-band observations
  8. GRB 091127: Swift-BAT refined analysis
  9. GRB 091127 : GROND observations
  10. GRB 091127: Liverpool Telescope afterglow candidate
  11. GRB 091127: Swift detection of a burst
  12. IPN Triangulation of GRB091120
  13. Konus-Wind observation of GRB 091120
  14. GRB 091117A: Suzaku WAM observation of the prompt emission
  15. GRB 091117: TNG optical observations
  16. GRB 091117A: Swift/UVOT followup observations
  17. GRB 091117: 2nd epoch of Magellan optical observations
  18. GRB 091117: Swift-XRT observations
  19. GRB 091117 BAT refined analysis
  20. GRB091117: Gemini South Observations
  21. GRB 091117: Swift XRT refined analysis
  22. Konus-Wind observations of GRB 091117A
  23. GRB 091117: Magellan optical observations
  24. GRB 091112: Suzaku WAM observation of the prompt emission
  25. GRB 091102A: Suzaku WAM observation of the prompt emission
  26. GRB 091109B: Suzaku WAM observation of the prompt emission
  27. GRB091111: Swift XRT refined analysis
  28. Konus-Wind and Konus-RF observations of GRB 091031
  29. GRB 091112: Swift-BAT refined analysis
  30. GRB 091112: Fermi GBM observation
  31. GRB 091031: Fermi LAT detection of a faint burst
  32. GRB 091112: Swift detection of a possible burst
  33. GRB 091111: BOOTES-3 contemporaneous imaging
  34. GRB 091111: BOOTES-3 observations
  35. GRB 091111: a faint long GRB detected with INTEGRAL
  36. GRB 091109b: Magellan Observations
  37. GRB 091109B: Swift-BAT refined analysis
  38. GRB 091109B: Optical limits from Watcher
  39. GRB 091109B: Swift detection of a short burst
  40. GRB 091109: BOOTES-3 observations
  41. GRB 091109: Faulkes Telescope South observations
  42. GRB 091109: Swift-BAT refined analysis
  43. GRB 091109: Swift detection of a burst with optical afterglow
  44. GRB 091029: Observations from Stardome Observatory
  45. GRB 091104: Swift-BAT refined analysis
  46. GRB091026 : IRSF NIR upper limit
  47. GRB 091104: Swift detection of a burst
  48. GRB 091102: LABOCA/APEX submm observations
  49. GRB 091102: GROND Upper Limits
  50. GRB 091102: BOOTES-3 observations
  51. GRB 091102: Swift-BAT refined analysis
  52. GRB 091102: Swift detection of a burst
  53. GRB 091031: Fermi GBM detection
  54. GRB 091024: Fermi LAT upper limits
  55. GRB 091018: Skynet/PROMPT Observations of Possible Host Galaxy
  56. GRB 090920: Skynet/DSO Detection
  57. GRB 091029: Skynet/PROMPT Continued Observations of Fading
  58. GRB 091029: BOOTES-3 observations
  59. GRB 091029: Swift-BAT refined analysis
  60. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  61. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  62. GRB 091029: Swift detection of a burst with an optical counterpart
  63. GRB 091026: Suzaku WAM observation of the prompt emission
  64. GRB 091024: Keck/LRIS Spectroscopy
  65. GRB 091024: YNAO-GMG observations
  66. GRB 091026: GROND Upper Limits
  67. GRB 091020: Late TLS detection
  68. GRB 091026: Swift-BAT refined analysis
  69. Radio afterglow detection from GRB 091020
  70. Konus-Wind and Konus-RF observations of GRB 091024
  71. GRB 091026: Swift detection of a Gamma Ray Burst
  72. GRB 091024: TLS Upper Limit
  73. GRB 091020: Early TLS Multicolor detections, red afterglow
  74. GRB 091024: Swift-BAT refined analysis
  75. GRB 091024: Swift-XRT team refined analysis
  76. GRB 091024: GRAS004 optical observations
  77. GRB 091024: Faulkes Telescope North Afterglow Candidate
  78. GRB 091024: Swift detection of a burst
  79. GRB 091018: Skynet/PROMPT Continued Observations of Fading
  80. Konus-Wind observations of GRB 091010
  81. GRB 091020, Swift-BAT refined analysis
  82. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  83. GRB 091020: Swift detection of a burst with an optical afterglow
  84. GRB 091018: miniTAO/ANIR Observations
  85. GRB 091018: Skynet/PROMPT Observations of Fading
  86. Konus-RF observation of GRB 091018
  87. GRB 091018: BOOTES-3 observations
  88. GRB091018: Swift/UVOT observations
  89. GRB 091018: Swift-BAT refined analysis
  90. GRB 091015: Skynet/PROMPT Observations
  91. GRB 091018: Swift detection of a burst with optical afterglow
  92. GRB 091015: RTT150 optical observations
  93. GRB 091010: optical afterglow candidate rejection
  94. GRB 090815: a faint long GRB localized by INTEGRAL
  95. GRB 091010: Suzaku WAM observation of the prompt emission
  96. GRB 091010: AGILE-MCAL measurement and GRID upper limit
  97. GRB 091010: Fermi GBM observation
  98. GRB 091010: Faulkes Telescope North observations
  99. GRB 090531A: Skynet/PROMPT Observations
  100. GRB 090530A: Skynet/DSO Detections

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