Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19596 results found.

  1. GRB 090926B: Swift XRT refined analysis
  2. GRB 090926B: Swift-BAT refined analysis
  3. GRB 090926A: Swift/UVOT detection of an optical afterglow
  4. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  5. GRB090926A: UVOT-enhanced XRT position
  6. GRB 090926B: Swift detection of a burst
  7. GRB 090926: Fermi LAT detection
  8. GRB090904B : IRSF NIR upper limit
  9. Swift returns to normal operations
  10. GRB 090715B: Skynet/PROMPT Detections
  11. GRB 090916: Swift-XRT upper limit
  12. GRB 090807: Skynet/DSO Observations
  13. Swift-BAT temporarily off-line for a few days
  14. Short-Duration GRB 090916: Skynet/PROMPT Observations
  15. GRB 090912: optical observation
  16. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  17. GRB 090916, Swift-BAT refined analysis
  18. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  19. GRB 090916: Swift detection of a short burst
  20. GRB 090915 Swift-BAT detection of a burst in ground analysis
  21. GRB 090827: Confirmation of the X-ray afterglow
  22. GRB 090912: Swift-XRT refined analysis
  23. GRB 090912, Swift-BAT refined analysis
  24. GRB 090912: Swift/UVOT Upper Limits
  25. GRB 090912: Enhanced Swift-XRT position
  26. GRB 090912: Swift detection of a burst
  27. GRB 090814A: Skynet/DSO & GORT Observations
  28. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  29. GRB 090904B: GROND detection of the optical afterglow
  30. GRB 090904A: Swift/UVOT Refined Analysis
  31. GRB 090904B: Swift/UVOT Refined Analysis
  32. GRB 090904B: Fermi GBM detection
  33. GRB 090904A: Swift-XRT refined analysis
  34. GRB 090904B: Swift XRT Refined Analysis
  35. GRB 090904B: MOA-II Optical observation
  36. GRB 090904A: Enhanced Swift XRT position
  37. GRB 090904B: Swift-BAT refined analysis
  38. GRB 090904A: Swift-BAT refined analysis
  39. GRB 090904B: Enhanced Swift-XRT position
  40. GRB090904A: Correction to enhanced XRT position
  41. GRB 090904A: Enhanced Swift-XRT position
  42. GRB090904B: REM observations
  43. GRB 090904B: Swift detection of a burst
  44. GRB 090904A: ROTSE-III Optical Limits
  45. GRB 090904: Swift detection of a burst
  46. GRB 090902B: Swift/UVOT refined analysis
  47. GRB090902B: Swift XRT refined analysis
  48. GRB 090902B: Faulkes Telescope North observations
  49. GRB 090902B: GROND NIR Afterglow Observations
  50. GRB 090902B: Gemini-N absorption redshift
  51. GRB 090902B: Enhanced Swift-XRT position
  52. GRB 090902B: Optical afterglow candidate
  53. GRB090902B: Swift/UVOT observations
  54. GRB 090902B: Swift/XRT Afterglow Candidate
  55. GRB 090902B: Fermi LAT detection
  56. GRB 090831C BAT refined analysis
  57. GRB 090831C: GROND upper limits
  58. Swift Trigger 361477, called GRB090831B, is probably not real.
  59. GRB090831C: Swift/UVOT upper limits
  60. GRB 090831C: Swift XRT Refined Analysis
  61. GRB 090831C: Enhanced Swift-XRT position
  62. GRB 090831C: Swift detection of a burst
  63. GRB 090831B, RIMOTS optical upper limits
  64. GRB 090831B: Swift detection of a possible burst
  65. GRB 090827: Swift XRT and UVOT observations
  66. GRB 090827 Burst discovered in BAT ground analysis
  67. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  68. GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
  69. GRB 090823 Correction to BAT position
  70. GRB 090817: No host galaxy, no supernova
  71. Konus-Wind observations of GRB 090823
  72. GRB 090823 Long burst with IPN triangulation and BAT position
  73. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  74. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  75. GRB 090817: Liverpool Telescope Observations
  76. GRB 090817: Confirmation of the X-ray afterglow
  77. GRB 090815C: Swift refined analysis
  78. GRB 090817: Swift/UVOT Upper Limits
  79. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  80. GRB 090817: Swift-XRT observations
  81. GRB 090813: Suzaku WAM observation of the prompt emission
  82. GRB 090812: Suzaku WAM observation of the prompt emission
  83. GRB 090813: CrAO optical obsevations
  84. GRB 090814B: Confirmation of the X-ray afterglow
  85. GRB 090814B: I-band observations from 1.23m CAHA telescope
  86. GRB 090814B: Swift/UVOT Upper Limits
  87. GRB 090814B: Liverpool Telescope Observations
  88. GRB 090814B: Swift-XRT detection of a possible afterglow.
  89. GRB 090814A: Swift/UVOT Observations
  90. GRB 090814A: Swift-XRT Team Refined Analysis
  91. GRB 090814A, RIMOTS optical upper limits
  92. GRB 090814A: Swift-BAT refined analysis
  93. GRB 090814: Enhanced Swift-XRT position
  94. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  95. GRB 090814: Swift detection of a burst
  96. GRB 090813: Fermi GBM observation
  97. GRB 090813: Swift-XRT refined analysis
  98. GRB 090813, Swift-BAT refined analysis
  99. Konus-Wind observations of GRB090813
  100. GRB090813: Swift/UVOT upper limits

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