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"

5161 results found.

  1. GRB 240824B: Fermi GBM Final Real-time Localization
  2. GRB 240824A: Retraction of GCN 37255
  3. GRB 240824A: Skynet Optical Afterglow Discovery
  4. Swift GRB240824.04: Global MASTER-Net observations report
  5. Fermi GRB 240821A: Global MASTER-Net observations report
  6. GRB240821A: EIRSAT-1 GMOD Detection
  7. GRB240821B: First GRB Detected by EIRSAT-1 GMOD
  8. Fermi GRB 240821B: Global MASTER-Net observations report
  9. GRB 240821B: Fermi GBM Final Localization
  10. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  11. Fermi trigger No 745873283: Global MASTER-Net observations report
  12. Fermi trigger No 745871958: Global MASTER-Net observations report
  13. IceCube-240721A: AT2023qqp and AT2024pge likely unrelated
  14. GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
  15. Fermi trigger No 745501396: Global MASTER-Net observations report
  16. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  17. GRB 240811A: Swift-XRT refined Analysis
  18. Fermi trigger No 745057312: Global MASTER-Net observations report
  19. GRB 240808A: AstroSat CZTI detection
  20. GRB 240809A: Swift-XRT refined Analysis
  21. GRB 240807B: AstroSat CZTI detection of a short burst
  22. EP EP240807a: Global MASTER-Net observations report
  23. EP EP240806a: Global MASTER-Net observations report
  24. Fermi trigger No 744761058: Global MASTER-Net observations report
  25. Fermi trigger No 744629911: Global MASTER-Net observations report
  26. GRB 240624B: VZLUSAT-2 detection
  27. GRB 240619C: VZLUSAT-2 detection
  28. GRB 240805B: Swift-XRT refined Analysis
  29. GRB 240805A: Swift-XRT refined Analysis
  30. GRB 240805B: Swift detection of a burst
  31. Fermi GRB 240804A: Global MASTER-Net observations report
  32. Fermi GRB 240801A: Global MASTER-Net observations report
  33. GRB 240730A: Swift-XRT refined Analysis
  34. Fermi trigger No 743953682: Global MASTER-Net observations report
  35. GRB 240727A: Swift-XRT refined Analysis
  36. GRB 240726B: AstroSat CZTI detection of a short burst
  37. IceCube-240725A: Upper limits from a search for additional neutrino events in IceCube
  38. Fermi trigger No 743219692: Global MASTER-Net observations report
  39. GRB 240720A: AstroSat CZTI detection
  40. GRB 240720A: Fermi GBM observation
  41. GRB 240720A: Swift detection of a burst
  42. Fermi GRB 240718A: Global MASTER-Net observations report
  43. LAT GRB240718.27: Global MASTER-Net observations report
  44. Konus-Wind detection of GRB 240715A
  45. GRB240715A: GRANDMA Optical Upper Limits
  46. JinShan confirmation of the EP-WXT source triggered on July 14th due to a flaring star
  47. EP240703b: GSP optical upper limit
  48. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  49. GRB 240705A: Fermi GBM Final Real-time Localization
  50. EP240703b: EP-WXT detection of a fast X-ray transient
  51. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  52. GRB 240624B: GRBAlpha detection
  53. GRB240624A: Fermi GBM Observation
  54. Swift GRB 240624A: Global MASTER-Net observations report
  55. Fermi GRB 240624A: Global MASTER-Net observations report
  56. GRB 240624B: Fermi GBM Final Real-time Localization
  57. Fermi trigger No 740949590: Global MASTER-Net observations report
  58. GRB 240624A: Fermi GBM Final Real-time Localization
  59. LIGO/Virgo S240615dg: Swift XRT observations, 39 X-ray sources
  60. Fermi trigger No 740430582: Global MASTER-Net observations report
  61. GRB240615A: 1.3m DFOT optical upper limit
  62. Fermi trigger No 740221779: Global MASTER-Net observations report
  63. GRB 240612A: Fermi GBM Final Real-time Localization
  64. Konus-Wind detection of GRB 240607A
  65. Fermi GRB 240610A: Global MASTER-Net observations report
  66. IPN triangulation of GRB 240607A
  67. Fermi GRB 240607A: Global MASTER-Net observations report
  68. GRB 240606B: Swift-XRT afterglow detection
  69. Fermi GRB 240604A: Global MASTER-Net observations report
  70. GRB 240605C: Fermi GBM Final Real-time Localization
  71. Fermi GRB 240602A: Global MASTER-Net observations report
  72. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  73. GRB 240529A: AKO Optical Afterglow Detection
  74. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  75. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  76. LAT GRB240527.59: Global MASTER-Net observations report
  77. Fermi GRB 240527B: Global MASTER-Net observations report
  78. GRB 240527A: Fermi GBM Final Real-time Localization
  79. Fermi trigger No 738348224: Global MASTER-Net observations report
  80. Fermi trigger No 738330463: Global MASTER-Net observations report
  81. GRB 240523A: Swift-XRT refined Analysis
  82. GRB 240513A: Swift-XRT afterglow detection
  83. Fermi trigger No 737996942: Global MASTER-Net observations report
  84. GRB 240504A: VZLUSAT-2 detection
  85. Fermi trigger No 737788024: Global MASTER-Net observations report
  86. Fermi GRB 240517A: Global MASTER-Net observations report
  87. GRB 240516A ATCA radio observations
  88. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  89. Fermi trigger No 737523389: Global MASTER-Net observations report
  90. GRB 240514B: GOTO candidate optical counterpart
  91. GRB 240513A: Fermi GBM observation
  92. GRB 240513A: Swift-XRT observations
  93. LAT GRB240513.31: Global MASTER-Net observations report
  94. Fermi trigger No 737277727: Global MASTER-Net observations report
  95. Fermi trigger No 737247400: Global MASTER-Net observations report
  96. Fermi trigger No 737196587: Global MASTER-Net observations report
  97. Fermi trigger No 737168073: Global MASTER-Net observations report
  98. GRB 240511A: Swift-XRT refined Analysis
  99. Fermi trigger No 737173236: Global MASTER-Net observations report
  100. Fermi trigger No 737152719: 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