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"

45422 results found.

  1. GRB 120119A: optical observations
  2. GRB 120118B: TNG NIR observations
  3. GRB 120118B: Swift-XRT refined Analysis
  4. GRB 120118B : Lulin Optical limit
  5. GRB 120119A: MMT redshift confirmation
  6. GRB 120119A: Lick 3m Spectroscopy
  7. GRB 120119A: Gemini-S redshift
  8. GRB 120119A: PROMPT optical observation of early afterglow
  9. GRB 120119A: GROND Detection of the Optical/NIR Afterglow
  10. GRB 120118B: Swift/UVOT Upper Limits
  11. GRB 120119A: Liverpool Telescope afterglow detection
  12. GRB 120119A: PAIRITEL NIR Detection
  13. GRB 120119A: Swift detection of a burst with an optical counterpart
  14. GRB 120118B: NOT observations
  15. GRB 120118B: Enhanced Swift-XRT position
  16. GRB 120118B: Faulkes Telescope South observations
  17. XRF 120118A: early optical limit by "Pi of the Sky"
  18. GRB 120118B: Swift-XRT position
  19. GRB 120118B: MASTER optical observations
  20. GRB 120118B: Swift detection of a burst
  21. XRF 120118A: Optical candidate
  22. XRF 120118A: further INTEGRAL analysis
  23. XRF 120118A: an X-Ray Flash detected by INTEGRAL
  24. GRB 120116A: Swift/UVOT Upper Limits
  25. GRB 120116A: Swift-XRT refined Analysis
  26. GRB 120116A: Enhanced Swift-XRT position
  27. AXP 4U 1042+61: Mondy optical observations
  28. GRB 120116A: Mondy optical observations
  29. GRB 120116A: Gemini optical/IR candidate
  30. GRB 120116A: EVLA observations
  31. GRB 120116A: WHT optical observations
  32. GRB 120116A: Optical observations at Crni Vrh
  33. GRB 120116A: Swift-BAT refined analysis
  34. GRB 120116A: NOT observations
  35. GRB 120116A: IAC80 I-band observations
  36. GRB 120116A: Bassano Bresciano Observatory optical observations
  37. GRB 120116A: MASTER Early optical limit
  38. GRB 120116A: Swift detection of a burst
  39. GRB 120114A found in ground analysis of BAT data
  40. GRB 111228A: optical observations
  41. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  42. GRB 120106A: optical upper limit
  43. Swift detection of an SGR burst from AXP 4U 0142+61
  44. GRB 120107A: Suzaku WAM observation of the prompt emission
  45. GRB 110915B, the review of the sky area in plate archives
  46. GRB 120107A: Fermi GBM observation
  47. GRB 120106A: MITSuME Okayama Optical Observation (update)
  48. Konus-Wind observation of GRB 120107A
  49. IPN Triangulation of GRB 120107A
  50. GBM trigger 347620337 (GRB 120107A?) : High-energy photon emission in Fermi/LAT data
  51. GRB 120106A: Swift/UVOT Upper Limits
  52. GRB 120106A: Bassano Bresciano Observatory optical observations
  53. GRB 120106A: MITSuME Okayama Ks-band upper limit
  54. GRB 120106A: MASTER Early OT marginally detection
  55. GRB 120106A: Swift-XRT refined Analysis
  56. INTEGRAL Weak trigger #6433: GRT Optical Observation
  57. GRB 120106A: Swift-BAT refined analysis
  58. GRB 120106A: MITSuME Okayama Optical upper limits
  59. GRB 120106A: Enhanced Swift-XRT position
  60. GRB 120106A: TAROT Calern observatory optical observations
  61. GRB 120106A: MASTER-Tunka optical observations
  62. GRB 120106A: Swift detection of a burst
  63. GRB111228A :LOAO R-band Observations
  64. GRB 111225A, the review of the sky area in plate archives
  65. GRB 111222A, the review of the sky area in plate archives
  66. GRB 111222A: Fermi GBM observations
  67. GRB 111222A: Second Swift observation
  68. GRB111209A: ATCA detection at 5.5, 9, and 18GHz
  69. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  70. GRB 111211A: Detection of the SN with the 10.4m GTC
  71. GRB 120102A: Fermi GBM observation
  72. Konus-Wind observation of GRB 120102A
  73. GRB 120102A: Swift-BAT refined analysis
  74. GRB 111228A: optical observations in CrAO
  75. GRB 120102A: Swift-XRT refined Analysis
  76. GRB 120102A: Swift/UVOT Detection
  77. GRB 120102A: Enhanced Swift-XRT position
  78. GRB 120102A: Swift detection of a burst with an optical counterpart
  79. GRB 111225A: optical observations in CrAO
  80. GRB 111228A, optical observations
  81. GRB 111228A: LOAO Optical Observation
  82. Konus-Wind observation of GRB 111228A
  83. GRB 111228A: MASTER-Net optical photometry
  84. GRB 111228A: correction for GCN 12787
  85. GRB 111228A: Optical and NIR observations with Kanata telescope
  86. GRB 110915A, the review of the sky area in plate archives
  87. GRB 111228A: SMARTS optical/IR afterglow observations
  88. GRB 111229A: Swift/UVOT Detection
  89. GRB 111229A: Faulkes Telescope South observations
  90. GRB 111229A: Swift-XRT refined Analysis
  91. GRB 111229A: Enhanced Swift-XRT position
  92. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  93. GRB111228A: Further GMG observations
  94. GRB 111229A: Gemini-South Redshift
  95. GRB 111229A: Swift-BAT refined analysis
  96. GRB 111229A: GROND afterglow candidate
  97. GRB 111229A: Swift detection of a burst
  98. GRB 111228A: Liverpool Telescope Observations
  99. GRB 111225A: Lightbuckets Optical Observations
  100. GRB 111228A: P60 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