Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

28101 results found.

  1. GRB 220715B: Fermi GBM detection
  2. GRB 220715B: Swift-XRT refined Analysis
  3. GRB 220715B: Swift/UVOT Upper Limits
  4. GRB 220715B: Enhanced Swift-XRT position
  5. GRB 220715B: Swift detection of a burst
  6. GRB 220714B: Swift-BAT refined analysis
  7. GRB 220714B: Fermi GBM observation
  8. GRB 220714B: LCO Optical Observations
  9. GRB 220714B: Swift-XRT refined Analysis
  10. GRB 220714B: UVOT afterglow discovery
  11. GRB 220714B: Enhanced Swift-XRT position
  12. GRB 220714B: Swift detection of a burst
  13. GRB 220710A: Swift/UVOT Upper Limits
  14. GRB 220711C: Fermi GBM Observation
  15. GRB 220711B: 10.4 m GTC(+EMIR) observations
  16. GRB 220711B: 10.4 m GTC(+EMIR) observations
  17. GRB 220711C: Swift/BAT-GUANO detection outside the coded FOV
  18. GRB 220711B, GROND observations
  19. GRB 220711B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  20. GRB 220711B: GIT optical upper limits
  21. Fermi trigger No 679248723: Global MASTER-Net observations report
  22. Fermi GRB 220711B: Global MASTER-Net observations report
  23. GRB 220712B: NOT optical afterglow confirmation
  24. GRB 220710A: Swift/BAT-GUANO arcminute localization
  25. GRB 220711B: Swift-BAT refined analysis
  26. IPN triangulation of GRB 220711C (short)
  27. GRB 220711B: Swift-XRT refined Analysis
  28. GRB 220711B: Swift/UVOT Upper Limits
  29. GRB 220711B: Enhanced Swift-XRT position
  30. GRB 220711B: Fermi GBM Detection
  31. GRB 220711B: NOT optical observations
  32. GRB 220711B: LCO Optical Upper Limits
  33. GRB 220711B: Swift detection of a burst
  34. GRB 220707A: AstroSat CZTI detection
  35. GRB 220708B: GIT optical upper limits
  36. GRB 220708A: Swift-BAT refined analysis
  37. GRB 220708B: T193-OHP optical upper limit
  38. Konus-Wind detection of GRB 220708B
  39. GRB 220708B: Nanshan/NEXT optical upper limits
  40. GRB 220708A: Swift/UVOT Upper Limits
  41. GRB 220706A : NICER detection of re-brightening 1 day after the Swift trigger
  42. GRB 220708A: Swift-XRT refined Analysis
  43. GRB 220706A: Swift/UVOT Upper Limits
  44. GRB 220708B: Swift-XRT afterglow detection
  45. GRB 220706A: Swift-BAT refined analysis
  46. GRB 220708A: Enhanced Swift-XRT position
  47. GRB 220708B: Swift/BAT-GUANO arcminute localization
  48. GRB 220708A: Swift-XRT observations
  49. GRB 220706A: LCO Optical Upper Limits
  50. GRB 220706A: Swift-XRT refined Analysis
  51. GRB 220706A, GROND observations
  52. GRB 220706A: Optical observations from NOT
  53. GRB 220702B: AstroSat CZTI detection
  54. GRB 220706A: Nanshan/NEXT optical upper limits
  55. MAXI GRB220706.73: Global MASTER-Net observations report
  56. GRB 220706A: Enhanced Swift-XRT position
  57. GRB 220706A: Zadko observatory - Gingin optical observations
  58. GRB 220706A: Swift detection of a burst
  59. GRB 220701A: Swift-BAT refined analysis
  60. GRB220408A: VIRT Optical Upper Limit
  61. GRB220412A: VIRT Optical Upper Limit
  62. GRB220701A: VIRT Optical Upper Limit
  63. GRB 220701A: MITSuME Akeno optical upper limits
  64. Alert from the HAWC Burst Monitor HAWC-220702A
  65. GRB 220701A: COATLI Optical Upper Limit
  66. GRB 220701A: AbAO optical upper limit
  67. GRB 220701A: Keck/LRIS Optical Upper Limit
  68. GRB 220701A: Swift-XRT refined Analysis
  69. GRB 220701A: LCO Optical Upper Limits
  70. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  71. GRB 220701A: Swift/UVOT Upper Limits
  72. GRB 220701A: Lowell Discovery Telescope Optical Observations
  73. GRB 220701A: Enhanced Swift-XRT position
  74. GRB 220701A: Swift detection of a burst
  75. Fermi-LAT Gamma-ray Observations of IceCube-220629A
  76. GRB 220627A, GROND observations
  77. GRB 220624A: AGILE/GRID refined analysis
  78. GRB 220627A: Swift/UVOT Upper Limits
  79. Fermi-LAT Gamma-ray Observations of IceCube-220627A
  80. IceCube-220629A: No significant detection in HAWC
  81. IceCube-220627A: No significant detection in HAWC
  82. GRB 220627A: Swift-XRT afterglow detection
  83. Konus-Wind detection of GRB 220627A
  84. Trigger 1113743: Swift detection of MAXI J0655-013
  85. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  86. GRB 220627A: VLT MUSE redshift
  87. Swift XRT observations of WISEA J145820.77+412101.9 / IceCube 220624A
  88. GRB 220627A: MeerLICHT candidate optical afterglow
  89. GRB 220627A: Fermi GBM Detection of a possible Lensed or Ultra-long GRB
  90. GRB 220627A: Swift/BAT-GUANO detection outside the coded FOV
  91. Fermi-LAT Gamma-ray Observations of IceCube-220624A and and detection of a new gamma-ray source, Fermi J1458.0+4119
  92. GRB 220627A: Fermi-LAT detection
  93. GRB 220627A: MeerLICHT detection of two afterglow candidates
  94. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  95. IceCube-220624A: Upper limits from a search for additional neutrino events in IceCube
  96. IceCube-220624A: No significant detection in HAWC
  97. GRB 220623A: GIT optical upper limits.
  98. GRB 220623A: T193-OHP optical upper limit
  99. GRB 220624A: Fermi GBM Detection
  100. Fermi GRB 220623B: Global MASTER-Net observations report

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