Skip to main content
New! CHIME and DSA-110 FRB Notices, IceCube Notices and Schema v6.1.1. 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"
  1. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  2. GRB 080714: Swift-XRT refined analysis
  3. GRB 080714: Enhanced Swift-XRT position
  4. GRB 080714: Swift-BAT refined analysis
  5. GRB 080714: Swift detection of a burst
  6. GRB 080702A: optical upper limit
  7. GRB 080603A: CrAO optical observations
  8. GRB 080603B: optical observations in MAO
  9. GRB 080603B: optical observations in CrAO
  10. GRB 080710: Optical observation with MITSuME Okayama
  11. GRB 080710: TLS observations, steepening afterglow decay
  12. GRB 080702B: Swift XRT confirmation of the afterglow
  13. GRB 080710: Lick IR detection
  14. GRB 080710, Swift-BAT refined analysis
  15. GRB 0800707: optical observations
  16. GRB 080710: Rapid PROMPT Observations
  17. GRB 080710: Swift-XRT refined analysis
  18. GRB080710: Swift/UVOT observations
  19. GRB 080710: Enhanced Swift-XRT position
  20. GRB 080710: Faulkes Telescope North observations
  21. GRB 080710: Gemini spectroscopy and probable redshift
  22. UVOT white band observations of GRB080710
  23. GRB 080710: REM afterglow confirmation & brightening
  24. GRB 080710: KAIT OA candidate
  25. GRB 080710: Swift XRT position
  26. GRB 080710: Swift detection of a burst
  27. GRB 080707: possible break in the X-rays
  28. New Swift-XRT GRB products available online.
  29. GRB 080707: GROND Confirmation of the Optical Afterglow
  30. UVOT observations of GRB080707
  31. GRB 080707, Swift-BAT refined analysis
  32. GRB 080707: Swift XRT refined analysis
  33. GRB 080707: Enhanced Swift-XRT position
  34. GRB 080707: VLT redshift
  35. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  36. GRB 080707: Swift detection of a burst
  37. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  38. Trigger 316063: Swift detection of a transient
  39. GRB 080703: GROND Upper Limits
  40. GRB 080702B: GROND Upper Limits
  41. GRB 080703: Swift-XRT refined analysis
  42. GRB 080703: UVOT Follow-Up Observation
  43. GRB 080703: VLT observations of the afterglow
  44. GRB 080703: Enhanced Swift-XRT position
  45. GRB 080703, Swift-BAT refined analysis
  46. GRB 080702B Swift-BAT refined analysis
  47. GRB 080703: Swift detection of a burst with optical afterglow
  48. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  49. No radio detection from the short GRB 080702A
  50. GRB 080702b: LCO optical observations
  51. Swift/UVOT observation of GRB080702A
  52. GRB 080702B: Swift XRT and UVOT observations
  53. GRB 080625: Suzaku WAM observation of the prompt emission
  54. GRB 080702A: MITSuME Akeno optical upper limits
  55. GRB 080701A: Early RAPTOR optical limits
  56. Swift Trigger 315630: Swift/UVOT Upper Limits
  57. GRB 080702A, Swift-BAT refined analysis
  58. GRB 080702A: Swift-XRT Team refined analysis
  59. GRB 080702B : Burst detected in BAT during Swift slew
  60. GRB 080702A: Enhanced Swift-XRT position
  61. Swift Trigger 315630: TLS R-band observation
  62. Swift Trigger 315630: Probably not a GRB
  63. GRB 080702: Swift detection of a short burst
  64. GRB 080701: Swift-XRT refined analysis
  65. GRB 080701A, VATT optical upper limit
  66. TLS I-Band Observation of GRB 080701A
  67. GRB 080701A: Swift/UVOT Upper Limits
  68. GRB 080701A: Early Super-LOTIS Observations
  69. GRB 080701: Enhanced Swift-XRT position
  70. GRB 080701A, Swift-BAT refined analysis
  71. Trigger 315630: Swift detection of a possible burst
  72. GRB 080701: Swift-XRT Prompt Analysis
  73. GRB 080701: Swift detection of a burst
  74. GRB 080623: Suzaku WAM observation of the prompt emission
  75. GRB 080625: Swift/UVOT Follow-Up Observations
  76. GRB 080625: Further observations from OSN
  77. GRB 080625:Swift-XRT detection of the afterglow
  78. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  79. GRB 080625: Observations at OSN
  80. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  81. GRB 080623: GROND upper limits
  82. GRB080623: Swift UVOT followup observations
  83. GRB 080623: Swift-XRT refined analysis
  84. GRB 080623, Swift-BAT refined analysis
  85. GRB 080623: Enhanced Swift-XRT position
  86. GRB 080623: TAROT La Silla observatory optical observations
  87. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  88. GRB 080623: Swift XRT prompt analysis
  89. GRB 080623: Swift detection of a burst
  90. Swift trigger 314975 is not a GRB
  91. Swift-BAT trigger 314975 possible burst
  92. GRB080607: optical observation
  93. GRB 080603b: optical observation
  94. GRB 070809: Putative host galaxy and redshift
  95. VLA upper limit on INTEGRAL burst GRB 080613A
  96. GRB 0800603A: optical observation
  97. GRB080613B: MITSuME upper limits
  98. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  99. Konus-Wind observation of GRB 080613B
  100. GRB 080603A: optical observations on June 04

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