Skip to main content
New! BOOM Notices and Schema v7.0.0. 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.

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"

27475 results found.

  1. GRB 080607: Swift-XRT refined analysis
  2. Swift/UVOT Observations of GRB080607
  3. GRB 080605: optical observations
  4. GRB 080607 KAIT observations
  5. VLA detection of INTEGRAL burst GRB 080603A
  6. GRB 080607: Enhanced Swift-XRT position
  7. GRB 080605: GROND 2nd epoch observations
  8. GRB 080607 - PAIRITEL NIR detection
  9. GRB 080607: Swift detection of a burst with optical afterglow
  10. GRB 080607: ROTSE-III Detection of Optical Counterpart
  11. GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
  12. GRB 080605: Swift-UVOT refined analysis
  13. Possible VLA radio detection on INTEGRAL burst GRB 080603A
  14. GRB 080604: VLA radio upper limit
  15. GRB 080603B: VLA radio upper limit
  16. GRB 080605: Swift-XRT refined analysis
  17. GRB080605: observation by BOOTES
  18. GRB 080605: Enhanced Swift-XRT position
  19. GRB 080605: GROND detection of the optical afterglow candidate
  20. GRB080605: optical observations
  21. GRB 080605: VLT redshift
  22. GRB 080605: Liverpool Telescope optical afterglow candidate
  23. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  24. GRB 080605: TLS RRM Afterglow
  25. GRB 080605: Swift detection of a burst with an optical afterglow
  26. GRB 080603B: PAIRITEL infrared detection
  27. GRB 080603A: PAIRITEL infrared detection
  28. GRB 080603B: TLS Afterglow Observation
  29. GRB 080603A: TLS Afterglow Observation
  30. Swift/UVOT observations of GRB080604
  31. GRB080604: HET redshift retraction
  32. GRB 080604: Gemini-North spectroscopy
  33. GRB 080604: Swift-XRT refined analysis
  34. GRB 080603B: Hobby-Eberly Telescope redshift confirmation
  35. GRB 080603B : Liverpool Telescope Observations
  36. GRB 080603B: Swift-XRT refined analysis
  37. GRB 080603A: Swift-XRT detection of the afterglow
  38. GRB 080603B: Swift/UVOT detection of the afterglow
  39. GRB 080604: Enhanced Swift-XRT position
  40. GRB 080604: Hobby-Eberly Telescope spectroscopy
  41. GRB 080603A: Swift/UVOT detection of the afterglow
  42. GRB080603B: RTT150 optical observations, break in light curves
  43. GRB 080604: Early Super-LOTIS Observations
  44. GRB080604: confirmation of optical afterglow
  45. GRB 080604: Swift detection of a burst with an optical afterglow
  46. GRB080603B: NOT redshift
  47. GRB 080603B: BOOTES2/TELMA optical observations
  48. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  49. GRB 080603B: Swift detection of a burst with optical afterglow
  50. GRB080603: Super-LOTIS detection of Optical Counterpart
  51. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  52. GRB 080603: Gemini-North redshift
  53. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  54. GRB 080602: Swift-XRT refined analysis
  55. GRB 080602: NOT R-band upper limit
  56. GRB 080602: Enhanced Swift-XRT position
  57. GRB 080602: Swift detection of a burst
  58. Swift analysis of BAT Slew Survey event (Trigger=009)
  59. GRB 080523: afterglow confirmation and redshift constraints
  60. Reactivation of SGR 1627-41
  61. GRB 080524: Swift XRT and UVOT analysis
  62. GRB 080503: 2nd Epoch Chandra X-ray Observations
  63. GRB 080524: Swift-BAT detection of a burst in ground analysis
  64. GRB 080523: Swift-XRT refined analysis
  65. GRB 080520: VLT host detection
  66. GRB 080523: VLT optical observations
  67. Swift/UVOT observations of GRB 080523
  68. GRB 080523: Enhanced Swift-XRT position
  69. GRB 080523: Swift detection of a burst
  70. GRB 080515: KPNO 4m NIR afterglow detection
  71. GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
  72. GRB 80516: Swift/UVOT Observations
  73. GRB 080515: Swift-XRT position and analysis
  74. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  75. GRB 080514B: UVOT Observations
  76. GRB080520: Swift/UVOT observations
  77. GRB 080520: VLT redshift
  78. GRB 080520, GROND observations
  79. GRB 080520: Enhanced Swift-XRT position
  80. GRB 080520: Swift XRT Refined Analysis
  81. GRB 080520: Swift detection of a burst with optical afterglow
  82. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  83. GRB 080503: Further HST imaging
  84. GRB 080516, GROND further analysis
  85. GRB 080517: Swift-XRT refined analysis
  86. GRB 080514B: Further NIR observations
  87. GRB 080517: Enhanced Swift-XRT position
  88. GRB080517: Liverpool Telescope Optical Observations
  89. GRB 080517: Swift detection of a burst
  90. GRB 080516, GROND 2nd epoch observations
  91. GRB 080516, GROND observations
  92. GRB080430: optical observations
  93. GRB 080516, SMARTS optical/IR observations
  94. GRB 080516: Swift-XRT Team refined analysis
  95. GRB 080516: Enhanced Swift-XRT position
  96. GRB 080514B: NOT observations
  97. GRB 080516: Swift detection of a burst
  98. Errartum: VLA upper limit on GRB 080507
  99. VLA upper limit on GRB 080705
  100. GRB 080514B : redshift estimation

Advanced

Download all Circulars as a .tar.gz archive:
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