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"

3116 results found.

  1. GRB 160303A SMA observation
  2. GRB 160227A: McDonald 0.8m Detection
  3. GRB 160227A: MAXI/GSC detection
  4. GRB 160225A: TSHAO optical upper limit
  5. Konus-Wind observation of GRB 160220B
  6. GRB 160220A: MASTER-Amur observations
  7. LIGO/Virgo G211117: LOFAR follow-up
  8. GRB 160206A: MAXI/GSC detection
  9. GRB 160203A: Enhanced Swift-XRT position
  10. GRB 160203A: GROND Afterglow Candidate
  11. GRB 160203A: Swift detection of a burst
  12. GRB 160123A: Swift-BAT refined analysis
  13. IPN Triangulation of GRB 151231A
  14. LIGO/Virgo G211117: Subaru Hyper Suprime-Cam follow-up observation
  15. GRB 160107A: MAXI/GSC detection
  16. IPN Triangulation of GRB 151225A (short/hard)
  17. LIGO/Virgo G211117: Summary of Pan-STARRS transients
  18. GRB 160104B: MAXI/GSC detection
  19. LIGO/Virgo G211117: LOFAR follow-up
  20. LIGO/Virgo G211117: 44 transients from Pan-STARRS data during 2015-12-28/30
  21. LIGO/Virgo G211117: OAO-WFC NIR follow-up observations
  22. IPN Triangulation of GRB 151227B
  23. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  24. LIGO/Virgo G211117: Optical Observations with Kiso Schmidt telescope and KWFC
  25. LIGO/Virgo G211117: iPTF Optical Transient Candidates
  26. GRB 151228B: Fermi GBM observation
  27. LIGO/Virgo G211117: Optical NIR observation with Kanata telescope
  28. LIGO/Virgo G211117: Optical follow-up with Kanata telescope
  29. GRB 151228B: Swift detection of a burst with an optical detection
  30. GRB 151215A: TSHAO optical observations
  31. Swift detection of 4U 1850-03
  32. GRB 130831A: MASTER early OT detection and LC
  33. GRB 151205B: MASTER-NET early optical observations
  34. GRB 151205A: Swift detection of a burst
  35. GRB 151127A iTelescope observation
  36. GRB GRB 151118A: MASTER-NET optical observations
  37. GRB 151111A: GROND marginal detection of a afterglow candidate
  38. GRB 151111A: LCOGT-FTS afterglow observations
  39. GRB 151027A: Mondy optical observations
  40. GRB 150910A: CrAO optical observations
  41. LIGO/Virgo G194575: transients from Pan-STARRS in the RA=1hr localisation region
  42. GRB 151022A: MASTER-Ural observations
  43. GRB 151006A: Mondy optical upper limit
  44. Swift Trigger 658045 is not a GRB
  45. LIGO/Virgo G184098: Further VST-ESO PARANAL observations
  46. LIGO/Virgo G184098: VST-ESO PARANAL observations
  47. LIGO/Virgo G184098: Swift follow-up observations
  48. GRB 150907A: Swift-XRT afterglow detection
  49. GRB 150907B: Swift-BAT refined analysis
  50. GRB 150907B: Enhanced Swift-XRT position
  51. GRB 150907B: GROND Upper Limits
  52. GRB 150907B: Swift-XRT observations
  53. GRB 150907A: Swift-XRT observations
  54. GRB 150907A: MAXI/GSC detection
  55. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  56. GRB 150902A: MASTER-SAAO optical observations
  57. Konus-Wind observation of GRB 150902A
  58. GRB 150831B: MASTER-IAC early optical observations
  59. IPN Triangulation of GRB 150824A
  60. Konus-Wind observation of GRB 150818A
  61. GRB 150821A: Swift detection of a burst with an optical afterglow
  62. GRB 150819A: Swift-BAT refined analysis
  63. GRB 150819A: Swift detection of a burst
  64. Fermi GBM trigger 150806450 is not a GRB
  65. GRB 150801B: Enhanced Swift-XRT position
  66. Trigger 649113: Swift detection of SGR 1E 1841-045
  67. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  68. GRB 150710B refined analysis
  69. GRB 150710B detected in ground analysis of BAT data
  70. GRB 150626B, Swift-BAT refined analysis
  71. V404 Cyg: MASTER Swift, Integral alert observations
  72. GRB 150622A: MAXI/GSC detection
  73. GRB 150527A: Swift-XRT refined Analysis
  74. GRB 150527A: Fermi GBM observation
  75. GRB 150518A: Mondy optical observations
  76. GRB 150430A: MAXI/GSC detection
  77. GRB 150413A: CrAO optical observations
  78. GRB 150424B: MAXI/GSC detection
  79. GRB 150424A: Swift detection of a short burst
  80. IPN Triangulation of GRB 150330A (long/very intense)
  81. GRB 150323A: AAO optical observations
  82. GRB 150309A: CrAO optic upper limit
  83. GRB 150301A: Fermi GBM observation
  84. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  85. Fermi GBM Observations of Magnetar 4U 0142+61
  86. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  87. Trigger 631747: Swift detection of 4U 0614+09
  88. GRB 150212A: Swift-XRT refined Analysis
  89. GRB 150212A: MASTER optical observations
  90. GRB150212A: P60 Afterglow Candidate
  91. GRB 150210A: MASTER SN detection during LAT error box inspection
  92. GRB 150204A: GROND observations
  93. GRB 150203A iTelescope observation
  94. GRB 150204A: LCOGT-Sutherland and Siding Springs observations
  95. GRB 150202B: Swift XRT/UVOT observations
  96. GRB 150201A: GROND upper limits
  97. Konus-Wind observation of GRB 150127B
  98. GRB 150123A: MASTER inspection
  99. Swift Trigger 628458 likely not astrophysical
  100. Konus-Wind observation of GRB 150118B

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