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"

24603 results found.

  1. Fermi GRB190418.92 Global MASTER-Net observations report
  2. GRB 190406B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 576241792)
  3. IPN Triangulation of GRB 190415A
  4. Fermi GRB190417.46 Global MASTER-Net observations report
  5. LIGO/Virgo S190412m: TAROT-GRANDMA observation report.
  6. Fermi Trigger 576994194 / GRB 190415173 / : BALROG localization
  7. Fermi GRB190415.17 Global MASTER-Net observations report
  8. LIGO/Virgo S190412m: Palomar Gattini-IR Wide-field Infrared Follow-up
  9. LIGO/Virgo S190412m: Fermi-LAT search for a high-energy gamma-ray counterpart
  10. LIGO/Virgo S190412m: Swift/BAT data search
  11. LIGO/Virgo S190412m: J-GEM optical/NIR follow-up observations
  12. LIGO/Virgo S190412m: Fermi-GBM Observations
  13. LIGO/Virgo S190412m: MAXI/GSC Observations
  14. LIGO-Virgo S190412m: AGILE GRID observations
  15. LIGO/Virgo S190412m: Insight-HXMT/HE observation
  16. LIGO/Virgo S190412m/G329483: ANTARES neutrino search
  17. LIGO-Virgo S190412m: Search for neutrino counterparts with IceCube
  18. LIGO/Virgo S190412m: HAWC follow-up
  19. INTEGRAL prompt observation of S190412m
  20. LIGO-Virgo S190412m: AGILE preliminary analysis
  21. LIGO/Virgo S190412m: MASTER early alert observation
  22. LIGO/Virgo S190412m: Identification of a GW binary merger candidate
  23. LIGO/Virgo S190408an: GROND Observations of MASTER OT J154209.55-431742.2
  24. IceCube-190331A: Swift-XRT Follow-up Observations
  25. LIGO/Virgo S190408an: MAXI/GSC Observations
  26. GRB 190404C: MITSuME Akeno and Okayama optical upper limits
  27. LIGO/Virgo S190408an: CALET Observations
  28. LIGO/Virgo S190408an: HMT optical observations
  29. LIGO/Virgo S190408an: MASTER 3 OT's more detection
  30. Konus-Wind observation of GRB 190404B
  31. LIGO/Virgo ST190408an: Fermi-LAT search for a high-energy gamma-ray counterpart
  32. GRB 190409A: Swift detection of a possible burst
  33. LIGO-Virgo S190408an: further AGILE GRID observations after T0
  34. LIGO/Virgo S190408an: SAGUARO follow-up observations
  35. LIGO/Virgo S190408an: MASTER OT is 27 day old ATLAS SN candidate and unrelated
  36. LIGO/Virgo S190408an: Insight-HXMT/HE observation
  37. LIGO/Virgo S190408an: Swift/BAT data search
  38. LIGO-Virgo S190408an: AGILE GRID observations
  39. LIGO/Virgo S190408an: MASTER Global Robotic Net optical observations
  40. LIGO/Virgo S190408an: Identification of a GW binary merger candidate
  41. Search for neutrino counterparts to GW candidate S190408an with IceCube
  42. LIGO-Virgo S190408an: HAWC follow-up
  43. INTEGRAL observation of S190408an
  44. LIGO/Virgo S190408an: Fermi GBM Observation
  45. LIGO-Virgo S190408an: AGILE MCAL observations
  46. Fermi TriggNum 576054086 (GRB 1904204.29) / MASTER OT J071404.52+550304.2: CrAO optical observations
  47. Fermi Trigger 576356086 / GRB 190407788 / : BALROG localization
  48. Hard Fermi GRB190404.29/TriggNum576054086: MASTER optical counterpart discovery near PGC020455
  49. Fermi Trigger 576346051 / GRB 190407672 / GRB 190407A: BALROG localization
  50. GRB 190404B: CALET Gamma-Ray Burst Monitor detection
  51. GRB 190404C: Swift-XRT observations
  52. Swift GRB 190331B: Further Swift-XRT observations
  53. GRB 190330A: MITSuME Akeno and Okayama optical upper limits
  54. LIGO/Virgo: Announcing the start of Observing Run 3 (O3) and the beginning of the public gravitational-wave alert era
  55. Konus-Wind observation of GRB 190329A
  56. GRB 190331B: Swift observations of a ground-detected burst
  57. Fermi-LAT Gamma-ray Observations of IceCube-190331A
  58. Search for additional neutrino events from the direction of IceCube-190331A with IceCube
  59. IceCube-190331A: MASTER optical follow-up observations
  60. GRB 190331A: Fermi GBM detection
  61. GRB 190331A, Swift-BAT refined analysis
  62. IPN Triangulation of GRB 190329A (long/bright)
  63. IceCube-190331A - IceCube observation of a high-energy neutrino candidate event
  64. GRB 190331A: Swift detection of a burst
  65. Fermi Trigger 575656777 / GRB 190330694 / GRB 190330A: BALROG localization
  66. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  67. GRB 190326A: MITSuME Okayama optical upper limits
  68. Konus-Wind observation of GRB 190324A
  69. GRB 190326B: Fermi GBM detection
  70. Fermi Trigger 575278303 / GRB 190326314 / GRB190326B: BALROG localization
  71. GRB 190326A: Swift detection of a short burst
  72. Fermi Trigger 575251142 / GRB 190325999 / GRB 190325A: BALROG localization
  73. GRB 190324A: Swift-BAT refined analysis
  74. GRB190324A: MASTER OT observations
  75. GRB 190324A: Fermi GBM observation
  76. Further Chandra observations of GW170817 ~581-583 days since merger
  77. GRB 190324A: VLT/X-shooter redshift
  78. SWIFT GRB190324.95 Global MASTER-Net observations report
  79. Fermi Trigger 575160247 / GRB 190324947: BALROG localization
  80. GRB 190324A: Swift detection of a burst
  81. Fermi Trigger 575108474 / GRB 190324348: BALROG localization
  82. SWIFT GRB190323.85 Global MASTER-Net observations report
  83. Fermi Trigger 575067924 / GRB 190323879: BALROG localization
  84. Swift detection of LS I +61 303
  85. Fermi Trigger 575018216 / GRB 190323303: BALROG localization
  86. Fermi Trigger 574850558 / GRB 190321363: BALROG localization
  87. GRB 190320A: Swift-BAT refined analysis
  88. GRB190320A: MASTER GRB counterpart decay
  89. GRB 190320A: Fermi GBM observation
  90. SWIFT GRB190320.05 Global MASTER-Net observations report
  91. GRB 190320A: Swift-XRT observations
  92. GRB 190320A: Swift detection of a burst
  93. Fermi Trigger 574678842 / GRB 190319375: BALROG localization
  94. Fermi Trigger 574676902 / GRB 190319353: BALROG localization
  95. Fermi Trigger 574345067 / GRB 190315512: BALROG localization
  96. GRB190311A: MITSuME Akeno optical observation
  97. Fermi trigger 574140965 / GRB190313.15: MASTER Global Robotic Net optical observation
  98. GRB 190311A: Swift-BAT refined analysis
  99. GRB190305A: MASTER Global Robotic Net optical observation
  100. GRB190311A: OAO observations

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