Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
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"
  1. GRB101224A: EVLA Observations
  2. GRB110112A: EVLA Observations
  3. GRB110128A: MITSuME Okayama optical upper limits
  4. GRB 110125A: Fermi GBM detection
  5. GRB 101112A: Maidanak and CrAO optical observations
  6. GRB110128A: TNG NIR observations
  7. GRB 110128A, Swift-BAT refined analysis
  8. GRB 110128A: TAROT-Calern refined analysis
  9. GRB 110128A: Swift/UVOT observations
  10. GRB 110128A: Swift-XRT refined Analysis
  11. GRB 110120A: Suzaku WAM observation of the prompt emission
  12. GRB 110128A: WHT redshifts of nearby field galaxies
  13. GRB 110128A: VLT/X-shooter redshift
  14. GRB 110128A: Enhanced Swift-XRT position
  15. GRB 110128A: Afterglow detection from NOT
  16. GRB 110128A: TAROT Calern observatory upper limits
  17. GRB 110128A: Swift detection of a burst
  18. IBAS Alerts n. 6130 and 6131 are not due to a GRB
  19. Konus-Wind observation of GRB 110120A
  20. GRB 110123A: Fermi GBM detection
  21. GRB 110106B, radio observations
  22. GRB 110120A: MASTER optical observations
  23. GRB 110120A: Fermi LAT detection
  24. GRB 101224A, the review of the sky area in plate archives
  25. IPN triangulation of GRB 110120A
  26. GRB 101225A: CQUEAN optical observation
  27. GRB 110106A: CrAO optical observations
  28. GRB 110119A: Fermi GBM detection
  29. GRB 110120A: Fermi GBM detection
  30. GRB 110119A: Suzaku WAM observation of the prompt emission
  31. GRB 110112A: optical upper limit
  32. GRB 110120A: MASTER optical observations
  33. GRB110119: Swift/UVOT Detection
  34. GRB 110119A: Swift-XRT refined Analysis
  35. GRB110119A: MITSuME Okayama optical upper limits
  36. GRB 110119A: Swift-BAT refined analysis
  37. GRB 110119A: PAIRITEL NIR Afterglow Detection
  38. GRB 110119A: Enhanced Swift-XRT position
  39. GRB 110119A: Swift detection of a burst with an optical detection
  40. GRB110106A, mm-radio observations
  41. GRB 101219B: tentative redshift and spectroscopic supernova detection
  42. GRB 101219B: GROND detection of a SN signature
  43. Swift-BAT trigger 442771 is a noise fluctuation
  44. GRB 101219B: correction
  45. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  46. New feature in Fermi GBM GRB Ground Position Notices
  47. Swift-BAT Trigger 442539 is not a GRB
  48. Swift Trigger 442539 is probably not a GRB
  49. Short GRB 110112B : early optical limit by "Pi of the Sky"
  50. GRB101225A - timing analysis
  51. GRB 110112B: Fermi GBM observation
  52. The Christmas burst GRB 101225A - optical spectroscopy with GTC
  53. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  54. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  55. GRB 110107A: Swift-XRT afterglow confirmation
  56. GRB 101225A: HST observations - no host detected
  57. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  58. GRB 110112B: A short GRB detected by INTEGRAL
  59. GRB 110112A: Swift-XRT refined Analysis
  60. GRB 110112A: Swift/UVOT upper limits
  61. GRB 110112A: WHT candidate afterglow/host galaxy
  62. GRB 110112A: MASTER optical observations
  63. GRB 110112A: Swift-BAT refined analysis
  64. GRB 110112A: Enhanced Swift-XRT position
  65. GRB 110106B: MASTER optical observations
  66. GRB110112A: TNT optical afterglow candidate
  67. GRB 110112A: Swift detection of a possible short burst
  68. GRB 110106B: early optical and near-IR observations
  69. GRB 110107A: Swift/UVOT upper limits
  70. GRB 101225a
  71. GRB 101219b. Possible radio afterglow detection.
  72. GRB 110106B: MASTER early optical observations
  73. GRB 110107A: Swift-XRT Afterglow Candidate
  74. GRB 110107A: Swift-BAT refined analysis
  75. GRB 110107A detected in ground analysis of BAT slew data
  76. GRB 101213A: Gemini-N galaxy redshift
  77. GRB 110106B: Fermi GBM detection
  78. Short GRB 110106A: MASTER OT observations
  79. GRB 110106B: Swift-XRT refined Analysis
  80. GRB 110106B: Gemini-North / WHT detection of a fading afterglow
  81. GRB 110106A: TNG NIR observations
  82. GRB 110106B Gemini-N galaxy redshift
  83. GRB 110106B: Liverpool Telescope observations
  84. GRB 110106A: ISAS-Kanazawa optical upper limit
  85. GRB 110106A: MITSuME Okayama optical upper limits
  86. GRB 110106B: WHT candidate afterglow
  87. GRB 110106B: Swift-BAT refined analysis
  88. GRB 110106B: Enhanced Swift-XRT position
  89. GRB 110106A: Swift/UVOT Upper Limits
  90. GRB 110106A: TNG redshift of the closeby galaxy
  91. GRB 110106A: Swift-XRT refined Analysis
  92. GRB110106B: Xinglong TNT upper limit
  93. GRB 110106A: Swift-BAT refined analysis
  94. GRB 110106A: Enhanced Swift-XRT position
  95. GRB 110106B: Swift detection of a burst
  96. GRB 110106A: TNG optical observations and candidate counterparts
  97. GRB 110106A: MASTER optical observations
  98. GRB 101225A: Keck redshift
  99. GRB110106A: Xinglong TNT upper limit
  100. GRB 110106A: Swift detection of a burst

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