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"

6667 results found.

  1. GRB 110709A: Konkoly observations
  2. GRB 110708A: Konkoly observations
  3. GRB 110709B: Swift-XRT refined Analysis
  4. GRB 110709A: Swift-XRT refined Analysis
  5. Konus-Wind observation of GRB 110709B
  6. GRB 110709A: Fermi GBM observation
  7. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  8. GRB 110708A: Liverpool Telescope observations
  9. GRB 110708A: Lick observations
  10. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  11. GRB 110705A: Fermi GBM detection
  12. GRB 110625A: Fermi GBM and LAT observations
  13. GRB 110625A: Konkoly observations
  14. GRB 110625A: Swift-XRT refined Analysis
  15. Swift J185003.2-005627: Swift-XRT/UVOT refined analysis
  16. GRB 110604A: final update on Swift-XRT observations
  17. GRB 110610A: Fermi GBM detection
  18. GRB 110610A: Swift-XRT refined Analysis
  19. Swift detection of the X-ray afterglow of GRB 110604A
  20. GRB 110530A: optical observations in Mondy observatory
  21. GRB 110530A: Swift-XRT refined Analysis
  22. GRB 110529A: Fermi GBM detection
  23. GRB 110521A: Swift-XRT refined analysis
  24. GRB 110520A: Swift-XRT refined Analysis
  25. GRB 110426A: Fermi GBM detection
  26. GRB 110428A: Fermi-GBM observation
  27. GRB 110503A: Jet Break seen from TLS
  28. GRB 110503A: Swift-XRT refined Analysis
  29. GRB 110503A: PAIRITEL NIR Detection
  30. GRB 110503A - TLS Afterglow Observations
  31. GRB 110503A: NOT afterglow photometry
  32. GRB 110426A: Swift/XRT non-detection
  33. GRB 110428A : X-ray afterglow confirmation
  34. GRB 110428A : Swift-XRT observations
  35. GRB 110428A: Fermi-LAT Detection
  36. GRB 110422A: Swift-XRT refined Analysis
  37. GRB 110422A: THO optical observations
  38. GRB 110420B: Fermi GBM observation
  39. GRB 110420B: Spectral lag indicates short hard burst
  40. GRB 110420B: Swift-XRT afterglow candidate
  41. GRB 110420A: Swift-XRT refined Analysis
  42. GRB 110414A: Swift/UVOT Upper limits
  43. GRB 110414A: Swift-XRT refined Analysis
  44. GRB 110411A: PAIRITEL NIR Upper Limits
  45. GRB 110411A: Swift-XRT refined Analysis
  46. GRB 110412A: Fermi GBM observation
  47. GRB 110407A: Swift-XRT refined Analysis
  48. Konus-Wind observation of GRB 110406A
  49. GRB 110328/Swift J164449.3+573451: Chandra observations
  50. GRB 110402A: LOAO Optical Observation
  51. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  52. GRB 110401A: Fermi GBM detection
  53. GRB 110402A: Fermi GBM detection
  54. GRB 110402A afterglow observation
  55. GRB 110402A: Spectral lag indicates short hard burst
  56. GRB 110402A: Swift-XRT refined Analysis
  57. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  58. GRB 110402A: PAIRITEL NIR Upper Limits
  59. GRB 110328/Swift J164449.3+573451: Fermi observations
  60. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  61. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  62. GRB 110328B: Fermi-LAT Detection
  63. GRB 110328B: Fermi GBM detection
  64. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  65. GRB 110319B Swift-XRT afterglow confirmation
  66. GRB 110319B: Swift-XRT afterglow candidate.
  67. GRB 110319A: Swift-XRT refined Analysis
  68. GRB 110318B: Swift-XRT refined Analysis
  69. GRB 110318A: Fermi GBM detection
  70. GRB 110315A: RTT150 optical observations
  71. GRB 110315A: Swift-XRT refined Analysis
  72. GRB 110312A: RTT150 optical observations
  73. GRB 110312A: Swift-XRT refined Analysis
  74. GRB 110305A: Swift-XRT refined Analysis
  75. GRB 110301A: Fermi GBM detection
  76. GRB 110223A: Swift-BAT refined analysis
  77. GRB 110223A: Swift-XRT refined Analysis
  78. GRB 110223B: Swift-XRT refined Analysis
  79. GRB110213B: X-ray afterglow confirmation
  80. Swift XRT and UVOT Observations of OT 110215
  81. GRB 110213A: TNT optical observations
  82. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  83. GRB 110212A: Swift XRT and UVOT observations
  84. Swift GRB110213A: interesting behaviour
  85. GRB 110213A: Fermi GBM observation
  86. GRB 110205A: Konkoly optical observations
  87. GRB 110213B: Swift XRT observation
  88. GRB 110213A: Swift-XRT refined Analysis
  89. GRB 110213A: KAIT observations
  90. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  91. GRB 110210A: Swift-XRT refined Analysis
  92. GRB 110206A: Swift-XRT confirmation of the X-ray afterglow
  93. GRB 110207A: Swift-XRT observations
  94. GRB 110208A: Swift-XRT refined Analysis
  95. GRB 110207A: Fermi GBM observation
  96. GRB 110205A - Continued PAIRITEL NIR Observations
  97. GRB 110206A: UVOT detection of afterglow candidate
  98. GRB 110206A: Swift detection of a probable X-ray afterglow
  99. GRB 110205A: Lightbuckets Optical Observations
  100. GRB 110205A: Swift-XRT refined Analysis

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