Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

24587 results found.

  1. LIGO/Virgo G298048: Gemini-South Near-Infrared Photometry of the Optical Transient Candidate
  2. LIGO/VIRGO G298048: Swift UVOT detection and XRT upper limits
  3. LIGO/Virgo G298048: Subaru HSC follow-up observations
  4. LIGO/Virgo G298048: VLA Refined Analysis
  5. LIGO/Virgo G298048: MASTER observations of the NGC 4993
  6. LIGO/Virgo G298048: VLA Detection
  7. LIGO/Virgo G298048: Galaxy-Targeted Optical Followup With Las Cumbres Observatory
  8. GRB 170817B: Fermi GBM detection
  9. LIGO/Virgo G298048: DLT40 follow-up observation
  10. LIGO/Virgo G298048: Inspection of archival HST data at the position of the potential optical counterpart
  11. LIGO/Virgo G298048: Nearby Galaxies in the Localization Volume using the updated sky map computed using LALInference
  12. LIGO/Virgo G298048 : Fermi-LAT search for a high-energy gamma-ray counterpart
  13. LIGO/Virgo G298048: DECam optical candidate
  14. LIGO/Virgo G298048: Potential optical counterpart discovered by Swope telescope
  15. LIGO/Virgo G298048 - Update on Fermi/GBM GRB 170817A Analysis
  16. LIGO/Virgo G298048: AGILE GRID observations
  17. LIGO/Virgo G298048: AGILE MCAL observations
  18. LIGO/Virgo G298048: Swift/BAT data search
  19. LIGO/Virgo G297595: Pierre Auger Observatory neutrino follow-up
  20. LIGO/Virgo G298048 ANTARES search
  21. LIGO/Virgo G298048: Nearby Galaxies in the Localization Volume with Face-on Assumption
  22. GRB 170817A: Fermi GBM detection
  23. LIGO/Virgo G298048: Nearby Galaxies in the Localization Volume
  24. LIGO/Virgo G298048: Insight-HXMT observations
  25. IPN Triangulation of GRB 170816A (short/hard)
  26. LIGO/Virgo G298048: Astrosat CZTI upper limits
  27. LIGO/Virgo G298048: Further analysis of a binary neutron star candidate with updated sky localization
  28. LIGO/Virgo G298048: COINCIDENT IceCube neutrino candidate with Fermi GBM trigger 524666471/170817529
  29. LIGO/Virgo G298048: correction to the luminosity distance reported in GCN 21509
  30. LIGO/Virgo G298048: Identification of a binary neutron star candidate coincident with Fermi GBM trigger 524666471/170817529
  31. LIGO/Virgo G298048: FOUND COINCIDENT IceCube neutrino observation
  32. LIGO/Virgo G298048: INTEGRAL detection of a prompt gamma-ray counterpart
  33. LIGO/Virgo G298048: Fermi GBM trigger 170817.529 and LIGO single IFO trigger
  34. LIGO/Virgo G298048: Fermi GBM trigger 524666471/170817529: LIGO/Virgo Identification of a possible gravitational-wave counterpart
  35. GRB 170816A: Fermi GBM detection
  36. LIGO/Virgo G297595: Konus-Wind observations
  37. LIGO/Virgo G297595: INAF VST-ESO PARANAL observations
  38. LIGO/Virgo G297595: Subaru Hyper Suprime-Cam follow-up observations
  39. LIGO/Virgo G296853: Pierre Auger Observatory neutrino follow-up
  40. LIGO/Virgo G297595 : MAXI/GSC observations
  41. LIGO/Virgo G297595: Updated localization from LIGO and Virgo data
  42. GRB 170813A: Fermi GBM observation
  43. LIGO/Virgo G297595: Correction to luminosity distance stated in GCN 21474
  44. LIGO/Virgo G297595: Pan-STARRS coverage and transients over the first 5hrs
  45. LIGO/Virgo G297595: Insight-HXMT observations
  46. LIGO/Virgo G297595: Nearby Galaxies in the Localization Volume
  47. LIGO/Virgo G297595: Fermi GBM Observations
  48. LIGO/Virgo G297595: Swift/BAT data search
  49. LIGO/Virgo G297595: AGILE GRID observations
  50. LIGO/Virgo G297595 : Fermi-LAT search for high-energy gamma-ray counterpart
  51. LIGO/Virgo G297595 ANTARES search
  52. LIGO/Virgo G297595: INTEGRAL search for a prompt gamma-ray counterpart
  53. LIGO/Virgo G297595: AGILE MCAL observations
  54. LIGO/Virgo G297595: SPI-ACS/INTEGRAL data investigations
  55. LIGO/Virgo G297595: IceCube neutrino observations
  56. LIGO/Virgo G297595: Identification of a GW Binary Merger Candidate
  57. GRB 170813A: Swift-BAT refined analysis
  58. GRB 170810A: Swift-BAT refined analysis
  59. LIGO/Virgo G296853: Insight-HXMT observations
  60. LIGO/Virgo G296853 : MAXI/GSC observations
  61. GRB 170810A: Swift-XRT refined Analysis
  62. GRB 170810A: Fermi GBM observation
  63. GRB 170810A: Fermi-LAT detection
  64. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  65. GRB 170810A: MASTER-NET very bright OT detection
  66. LIGO/Virgo G296853: HAWC follow-up
  67. Konus-Wind observation of GRB 170808B
  68. LIGO/Virgo G296853: Super-AGILE observations
  69. GRB 170803B: Insight-HXMT detection
  70. Konus-Wind observation of GRB 170805B
  71. LIGO/Virgo G296853: no INTEGRAL data at the time of the event
  72. LIGO/Virgo G296853: Fermi-LAT search for high-energy gamma-ray counterpart
  73. LIGO/Virgo G296853: Fermi GBM Observations
  74. LIGO/Virgo G296853: AGILE GRID observations
  75. LIGO/Virgo G296853: Swift/BAT data search
  76. LIGO/Virgo G296853: MASTER follow up observations
  77. LIGO/Virgo G296853: AGILE MCAL observations
  78. LIGO/Virgo G296853 ANTARES search
  79. LIGO/Virgo G296853: IceCube neutrino observations
  80. LIGO/Virgo G296853: Identification of a GW Binary Merger Candidate
  81. GRB 170808B: Fermi LAT Detection
  82. GRB 170808B: Fermi GBM observation
  83. IPN Triangulation of GRB 170805B (short/hard)
  84. GRB 170801A: Insight-HXMT detection
  85. Konus-Wind observation of GRB 170724A
  86. GRB 170807A: Swift-BAT refined analysis
  87. GRB 170807A: Swift detection of a burst
  88. GRB 170804A: Swift-BAT refined analysis
  89. GRB 170803A: Swift-BAT refined analysis
  90. GRB 170804A: Swift detection of a burst with optical counterpart
  91. GRB 170803A: Swift-XRT refined Analysis
  92. GRB 170803A: Fermi GBM observation
  93. GRB 170802A: Fermi GBM detection
  94. Swift Trigger 765783 is not an astrophysical event.
  95. GRB 170728B: time correction to MASTER GCN Circular 21391
  96. Swift J181723.1-164300: Swift detection of another pulse of the new Galactic source
  97. Konus-Wind observation of GRB 170728B
  98. GRB 170726A: AstroSat CZTI detection
  99. GRB 170714A: Chandra observations
  100. GRB 170728B: Optical observations at Crni Vrh

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