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"

14950 results found.

  1. GRB 20230818A: GIT optical upper limit
  2. Konus-Wind detection of GRB 230818A
  3. GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
  4. GRB 230820A: AstroSat CZTI detection
  5. GRB 230818A: AstroSat CZTI detection
  6. GRB 230818A: Swift/UVOT Detection
  7. GRB 230818A: GOTO optical afterglow detection
  8. GRB 230818A: Swift detection of a burst
  9. GRB 230818A: Fermi GBM Final Real-time Localization
  10. Swift GRB230818.98: Global MASTER-Net OT detection
  11. GRB 230816A: SVOM/C-GFT optical detection
  12. GRB 230817A: AstroSat CZTI detection
  13. GRB 230812B: NOEMA detection
  14. GRB 230815A: VLT/HAWK-I near-infrared afterglow detection
  15. GRB 230817A: Fermi GBM Final Real-time Localization
  16. GRB 230812B: optical photometry from Konkoly
  17. GRB230816A: Possible host and GIT detection of optical counterpart
  18. IPN triangulation of GRB 230815B
  19. GRB 230816A: Nanshan/HMT optical afterglow detection
  20. GRB 230815A: SOAR/Goodman follow-up imaging
  21. GRB 230816A: Swift detection of a burst
  22. GRB 230815B: GECAM-B and GECAM-C detection of a burst
  23. GRB 230815B: AstroSat CZTI detection
  24. GRB230815A: BOOTES-6/DPRT optical upper limit
  25. GRB 230815A: Fermi GBM detection
  26. GRB 230815A: Swift detection of a burst
  27. GRB 230812B: AMI-LA radio detection of afterglow candidate
  28. GRB 230812B: Optical observaions from Rozhen Observatory
  29. GRB 230814A: Fermi GBM Final Real-time Localization
  30. GRB 230812B: OASDG optical observations
  31. Konus-Wind detection of GRB 230812B
  32. GRB230812B: AGILE/MCAL detection
  33. GRB 230812B: Swift-XRT afterglow detection
  34. GRB 230812: Swift/UVOT Detection
  35. GOTO confirmation and possible host galaxy of GRB230812B optical afterglow
  36. GRB 230812B: Zwicky Transient Facility Identifies Optical Afterglow Candidate of a Fermi GRB (Trigger 713559497)
  37. GRB 230812B: Fermi-LAT detection
  38. GRB 230812B: Fermi GBM detection of an extremely bright GRB
  39. GRB 230812B: Fermi GBM Final Real-time Localization
  40. GRB 230812A: Fermi GBM Final Real-time Localization
  41. GRB 230808A: Fermi GBM Detection
  42. LIGO/Virgo/KAGRA S230810af: Retraction of GW compact binary merger candidate
  43. GRB 230805B: AstroSat CZTI detection
  44. GRB 230808A: Swift/BAT-GUANO detection of a burst
  45. GRB 230808B: Fermi GBM Final Real-time Localization
  46. GRB 230808A: Fermi GBM Final Real-time Localization
  47. GRB 230807A: Fermi GBM Final Real-time Localization
  48. Konus-Wind detection of GRB 230803A
  49. GRB 230806A: Fermi GBM Final Localization
  50. GRB 230805B: BOOTES-6/DPRT optical upper limit and 1.5m OSN detection
  51. GRB 230805B: Swift detection of a burst
  52. GRB 230805A: Fermi GBM Final Real-time Localization
  53. GRB 230802B: AstroSat CZTI detection
  54. GRB 230804A: Fermi GBM Final Real-time Localization
  55. IPN triangulation of GRB 230803A
  56. GRB 230803A: AstroSat CZTI detection
  57. LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits
  58. GRB 230803A: Fermi GBM Final Real-time Localization
  59. GRB 230802B: Fermi GBM Final Localization
  60. GRB 230802A: BOOTES-5/JGT optical upper limit
  61. LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations
  62. GRB 230802A: Swift detection of a burst
  63. LIGO/Virgo/KAGRA S230731an: AstroSat CZTI non-detection and upper limits
  64. GRB 230731A: Fermi GBM Final Real-time Localization
  65. GRB 230723A: Detection of candidate millimeter-band radiation by SPT-3G
  66. GRB 230728A: Swift-BAT refined analysis
  67. GRB 230723B: MITSuME Ishigaki optical observation
  68. GRB 230728A: BOOTES-1 optical upper limit
  69. GRB 230727A: AstroSat CZTI detection
  70. GRB 230728A: Swift detection of a burst
  71. GRB 230727A: Swift/BAT-GUANO detection of a burst
  72. IceCube-230727A - IceCube observation of a high-energy neutrino candidate track-like event
  73. GRB 230727A: Fermi GBM Final Real-time Localization
  74. GRB 230723B: Further CAHA observations and host galaxy detection
  75. Konus-Wind detection of GRB 230723A
  76. GRB 230723B: MITSuME Akeno optical afterglow candidate detection
  77. IceCube-230724A - IceCube observation of a high-energy neutrino candidate track-like event
  78. IceCube-230725A - IceCube observation of a high-energy neutrino candidate track-like event
  79. IPN triangulation of GRB 230723A (short)
  80. GRB 230725B: Fermi GBM Final Real-time Localization
  81. GRB 230725A: Fermi GBM Final Real-time Localization
  82. GRB 230724A: Fermi GBM Final Real-time Localization
  83. GRB 230723A: AGILE/MCAL detection
  84. GRB 230723B: Swift detection of a burst
  85. GRB 230723A: Fermi GBM Final Real-time Localization
  86. GRB 230718A: Final Localization Correction
  87. GRB 230718A: Fermi GBM Final Real-time Localization
  88. IPN triangulation of GRB 230712A (short)
  89. GRB 230717A: Fermi GBM Final Real-time Localization
  90. LIGO/Virgo/KAGRA S230715bw: Retraction of GW compact binary merger candidate
  91. GRB 230715A: Fermi GBM Final Real-time Localization
  92. IceCube-230707A : MAXI upper limit and NICER follow-up observation of Swift J1753.5-0127
  93. GRB 230713A: Fermi GBM Final Real-time Localization
  94. GRB 230709B: CALET Gamma-Ray Burst Monitor detection
  95. GRB 230703A: CALET Gamma-Ray Burst Monitor detection
  96. GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  97. GRB 230712B: Fermi GBM Final Localization
  98. GRB 230712A: Fermi GBM Final Real-time Localization
  99. GRB 230709C: GRBAlpha detection
  100. GRB 230709B: GRBAlpha detection

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