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. Fermi trigger No 675992935: Global MASTER-Net observations report
  2. GRB 220603A: Swift/BAT-GUANO detection outside the coded FOV
  3. Fermi-GBM will trial new SAA regions from Tuesday June 7th
  4. GRB 220527A: MITSuME Akeno continued optical observation
  5. Konus-Wind detection of GRB 220528A
  6. IPN triangulation of GRB 220528A (short)
  7. GRB 220528A: Fermi GBM Observation
  8. Fermi GRB 220530A: Global MASTER-Net observations report
  9. Konus-Wind observation of GRB 220527A
  10. GRB 220530A: Fermi GBM Final Real-time Localization
  11. GRB 220528B: Swift/BAT-GUANO detection outside the coded FOV
  12. GRB 220528A: Fermi GBM Final Localization
  13. GRB 220527A: REM optical/NIR observations
  14. Fermi trigger No 675411172: Global MASTER-Net observations report
  15. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  16. GRB 220527A: MITSuME Akeno optical observation
  17. LAT GRB220527.39: Global MASTER-Net observations report
  18. GRB 220527A: Swift/UVOT detection
  19. GRB 220527A: Fermi GBM Observation
  20. GRB 220527A: Fermi-LAT detection
  21. GRB 220527A: Fermi GBM Final Localization
  22. GRB 220527A: AGILE detection
  23. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  24. GRB 220525A: Fermi GBM Detection
  25. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  26. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  27. Konus-Wind detection of GRB 220524B
  28. Konus-Wind detection of GRB 220525A
  29. Konus-Wind detection of GRB 220524A
  30. Swift GRB220526.48: Global MASTER-Net observations report
  31. Fermi GRB 220525A: Global MASTER-Net observations report
  32. IPN triangulation of GRB 220525A
  33. IPN triangulation of GRB 220524B
  34. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  35. IPN triangulation of GRB 220524A
  36. IceCube-220524A: Upper limits from a search for additional neutrino events in IceCube
  37. GRB 220525A: BALROG localization (Fermi Trigger 675130259 / GRB 220525008)
  38. GRB 220525A: Fermi GBM Final Real-time Localization
  39. GRB 220521A: ATCA detection
  40. Konus-Wind detection of GRB 220522B
  41. IPN triangulation of GRB 220522B
  42. Konus-Wind detection of GRB 220521B
  43. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  44. IPN triangulation of GRB 220521B
  45. IceCube-220524A - IceCube observation of a high-energy neutrino candidate track-like event
  46. GRB 220521A: MITSuME Akeno optical upper limits
  47. Fermi GRB 220523B: Global MASTER-Net observations report
  48. GRB 220523B: Fermi GBM detection
  49. GRB 220521A: MMT Afterglow Imaging
  50. GRB 220521A: REM optical/NIR upper limits
  51. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  52. VLA observations of GW170817 at ~4.8 years after the merger
  53. Fermi GRB 220523A: Global MASTER-Net observations report
  54. GRB 220523A: Fermi GBM Final Real-time Localization
  55. GRB 220521A: LCO Optical Detection
  56. GRB 220521A: Swift-BAT refined analysis
  57. GRB 220521A: Fermi GBM detection
  58. GRB 220521A: Swift-XRT refined Analysis
  59. Fermi GRB 220522A: Global MASTER-Net observations report
  60. Fermi trigger No 674868783: Global MASTER-Net observations report
  61. GRB 220522A: Fermi GBM Final Real-time Localization
  62. GRB 220521A: NOT spectroscopic redshift
  63. GRB 220521A: Swift detection of a burst
  64. GRB 220521A: Fermi GBM Final Real-time Localization
  65. Swift GRB220521.97: Global MASTER-Net observations report
  66. Konus-Wind detection of GRB 220519A
  67. IPN triangulation of GRB 220519A
  68. GRB 220518A: Swift-BAT refined analysis
  69. Swift GRB220519.84: Global MASTER-Net observations report
  70. GRB 220518A: Swift-XRT refined Analysis
  71. Fermi GRB 220518B: Global MASTER-Net observations report
  72. GRB 220518B: Fermi GBM Final Real-time Localization
  73. Swift GRB 220518A: Global MASTER-Net observations report
  74. GRB 220518A: Swift detection of a burst
  75. GRB 220514A: MITSuME Akeno optical observation
  76. GRB 220514A: GRANDMA Optical Afterglow Observations
  77. Konus-Wind detection of GRB 220506A
  78. Konus-Wind detection of GRB 220514B
  79. Fermi trigger No 674397342: Global MASTER-Net observations report
  80. GRB 220514A: Fermi GBM observation
  81. GRB 220514B: Swift-XRT observations
  82. GRB 220514A: KAIT Optical Afterglow Confirmation
  83. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  84. IceCube-220513A: Upper limits from a search for additional neutrino events in IceCube
  85. IceCube-220513A: No significant detection in HAWC
  86. MAXI GRB220514.98: Global MASTER-Net observations report
  87. Integral GRB220514.52: Global MASTER-Net observations report
  88. Fermi GRB 220514A: Global MASTER-Net observations report
  89. IceCube-220513A: No Candidate Counterparts from the Zwicky Transient Facility
  90. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  91. GRB 220514A: Fermi GBM Final Real-time Localization
  92. IceCube-220513A - IceCube observation of a high-energy neutrino candidate track-like event
  93. IceCube Alert 220513.97: Global MASTER-Net observations report
  94. Fermi GRB 220513A: Global MASTER-Net observations report
  95. GRB 220513A: Fermi GBM Final Real-time Localization
  96. Konus-Wind detection of GRB 220511A
  97. IceCube-220509A: No significant detection in HAWC
  98. GRB 220511A: Fermi GBM observation
  99. GRB 220511A: Swift-XRT observations
  100. Fermi GRB 220512A: 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