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.

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"

20968 results found.

  1. AXP 4U 1042+61: Mondy optical observations
  2. GRB 120116A: Mondy optical observations
  3. GRB 120116A: EVLA observations
  4. GRB 120116A: WHT optical observations
  5. GRB 120116A: Optical observations at Crni Vrh
  6. GRB 120116A: NOT observations
  7. GRB 120116A: IAC80 I-band observations
  8. GRB 120116A: Bassano Bresciano Observatory optical observations
  9. GRB 111228A: optical observations
  10. IPN Triangulation of GRB 120107A
  11. GRB 120106A: Swift/UVOT Upper Limits
  12. GRB 120106A: Bassano Bresciano Observatory optical observations
  13. GRB 120106A: MITSuME Okayama Ks-band upper limit
  14. GRB 120106A: TAROT Calern observatory optical observations
  15. GRB 120106A: MASTER-Tunka optical observations
  16. GRB111228A :LOAO R-band Observations
  17. GRB 111222A: Fermi GBM observations
  18. GRB 111222A: Second Swift observation
  19. GRB111209A: ATCA detection at 5.5, 9, and 18GHz
  20. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  21. GRB 111228A: optical observations in CrAO
  22. GRB 120102A: Swift/UVOT Detection
  23. GRB 111225A: optical observations in CrAO
  24. GRB 111228A, optical observations
  25. GRB 111228A: Optical and NIR observations with Kanata telescope
  26. GRB 111228A: SMARTS optical/IR afterglow observations
  27. GRB 111229A: Swift/UVOT Detection
  28. GRB 111229A: Faulkes Telescope South observations
  29. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  30. GRB111228A: Further GMG observations
  31. GRB 111229A: GROND afterglow candidate
  32. GRB 111228A: Liverpool Telescope Observations
  33. GRB 111225A: Lightbuckets Optical Observations
  34. GRB 111228A: P60 Observations
  35. GRB 111228A: T100 observations
  36. GRB 111228A: GMG optical observation
  37. GRB 111228A: NOT redshift
  38. FERMI GRB111228.45: MASTER observations
  39. GRB 111228A: Gemini South Redshift
  40. GRB 111228A: PAIRITEL NIR Detection
  41. GRB 111228A: MMT Redshift
  42. GRB 111228A: TAROT La Silla observatory observations
  43. GRB 111228A: GROND observations
  44. GRB 111228A: MASTER OT observations
  45. GRB 111228A: GRAS017 optical observations
  46. GRB 111228A: IAC80 BVI-band observations
  47. GRB 111228A: Swift/UVOT Detection
  48. GRB 111228A: Skynet/Dolomiti Optical Observations
  49. GRB 111228A: NOT optical observation
  50. GRB 111228A: optical observations
  51. GRB 111228A: TAROT Calern observatory. OT decay stopped
  52. GRB 111228A, optical observations
  53. GRB 111228A: TAROT Calern observatory. OT seems still bright
  54. GRB 111225A, optical observations
  55. GRB 111228A: Xinglong TNT confirms the optical afterglow
  56. GRB 111205A: optical observations
  57. GRB 111225A: Swift/UVOT Observations
  58. GRB 111225A: PAIRITEL NIR Upper Limits
  59. GRB 111225A: 1.23m CAHA optical observations
  60. GRBv111225A: Xinglong TNT optical afterglow
  61. GRB 111225A: Super-LOTIS early detection
  62. GRB 111225A: TAROT Calern observatory optical observations
  63. GRB111222A: GMG optical observation
  64. GRB 111222A: Xinglong TNT observation
  65. GRB 111222A: Swift/UVOT Observations
  66. GRB 111222A: Swift-XRT observations
  67. GRB 111215A: EVLA observations
  68. GRB 110820A: optical observations in Maidanak observatory
  69. GRB 111215B: Swift/UVOT Upper Limits
  70. GRB 111215B: Swift-XRT observations
  71. GRB 111215A: WHT, LT and NOT imaging
  72. GRB 111215A: TNG K-band observations
  73. GRB 111215A: Swift/UVOT Upper Limits
  74. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  75. GRB 111215A: OSN I-band observations
  76. GRB 111215A: MASTER-Net optical prompt and follow up observations
  77. GRB 111215A, Optical Observations
  78. GRB 111215A: GMG optical upper limit
  79. GRB 111215A : Xinglong TNT upper limit
  80. GRB 111212A: GROND observations
  81. GRB 111211A: VLT/X-shooter redshift
  82. GRB 111211A: NOT afterglow confirmation
  83. GRB 111211A: Swift/XRT target of opportunity observation
  84. GRB 111212A: Swift/UVOT Upper Limits
  85. GRB 111212A: Swift-XRT observations
  86. GRB 111211A: GROND afterglow candidate
  87. GRB 111210A: Xinglong TNT upper limit
  88. GRB 111209A - ATCA 34GHz upper limit
  89. GRB 111210A: GROND observations
  90. GRB 111210A: Gemini-North candidate counterpart
  91. GRB 111209A: Rebrightening seen by GROND
  92. GRB111210A: MITSuME Okayama J-band upper-limit
  93. GRB 111210A: Swift/UVOT Upper Limits
  94. GRB 111209A: VLT/X-shooter redshift
  95. GRB 111209A: GROND Afterglow observations
  96. GRB 111209A: PROMPT optical observations of early afterglow
  97. GRB 111208A: Lightbuckets Optical Observations
  98. GRB 111209A: Swift UVOT refined analysis
  99. GRB 111209A: Swift Burst of Interest
  100. GRB 111205A: GROND observations

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