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"

24581 results found.

  1. GRB 170409A: Fermi GBM Observation
  2. GRB 170409A: Fermi-LAT detection
  3. GRB 170405A: SMARTS optical/IR afterglow observations
  4. GRB 170403B CALET Gamma-Ray Burst Monitor detection
  5. GRB 170405A, Swift-BAT refined analysis
  6. GRB 170405A: Swift-XRT refined Analysis
  7. Konus-Wind observation of GRB 170405A
  8. GRB 170405A: LCO FTN observations
  9. GRB 170405A: Watcher optical detection
  10. GRB 170405A: NOT optical observations
  11. GRB 170405A: Fermi-LAT detection
  12. GRB 170405A: Fermi GBM observation
  13. LIGO/Virgo G275697: Update on significance from offline analyses
  14. LIGO/Virgo G275404: Update on significance from offline analyses
  15. LIGO/Virgo G275404: European VLBI Network (EVN) follow-up of the near-IR transient in the AGL J1914+1043 field
  16. GRB 170402A CALET Gamma-Ray Burst Monitor detection
  17. GRB 170330A CALET Gamma-Ray Burst Monitor detection
  18. Konus-Wind observation of GRB 170403A (short/hard)
  19. IPN Triangulation of GRB 170403A (short)
  20. GRB 170403A: Fermi GBM observation
  21. Konus-Wind observation of GRB 170330A
  22. IceCube-170321A: Konus-Wind upper limits
  23. Swift Trigger 745090 is a noise trigger near NGC 5195
  24. Fermi-LAT Gamma-ray Observations of IceCube-170321
  25. Swift triggered on SAX J1806.5-221
  26. GRB 170330A: AstroSat CZTI detection
  27. GRB 170330A: Swift-BAT refined analysis
  28. GRB 170331A: Swift-BAT refined analysis
  29. IceCube-170321A: Swift-XRT observations
  30. GRB 170330A: LCO Cerro Tololo observations
  31. LIGO/Virgo G275697: LOFAR follow-up
  32. Konus-Wind observation of GRB 170329A
  33. IBAS trigger 7789 is not a GRB
  34. Fermi trigger 512347439/GRB 170327A: MASTER-SAAO possible OT detection
  35. GRB 170329A: Fermi GBM detection
  36. GRB 170329A: Fermi-LAT detection
  37. GRB 170325B: POLAR Observation
  38. GRB 170325A: Fermi GBM observation
  39. LIGO/Virgo G277583: Konus-Wind observations
  40. GRB 170325A, Swift-BAT detection of a short GRB
  41. INTEGRAL pointed follow-up of IceCube-170321A
  42. LIGO/Virgo G277583: Fermi GBM Observations
  43. Konus-Wind observation of GRB 170320A
  44. GRB 170320A: POLAR Observation
  45. LIGO/Virgo G277583: INTEGRAL search for an X-ray and gamma-ray counterpart
  46. Fermi GBM Observation of IceCube-170321A
  47. IceCube-170321A - IceCube observation of a high-energy neutrino candidate event
  48. INTEGRAL SPI-ACS observation of AMON IceCube EHE 80305071 129307
  49. IPN Triangulation of GRB 170320A (long/intense)
  50. Search for counterpart to IceCube-170321A with ANTARES
  51. GRB 170318A: KAIT Optical Upper Limit
  52. GRB 170318B: Swift-BAT refined analysis
  53. LIGO/Virgo G277583: CALET Observations
  54. GRB 170318B: Fermi GBM observation
  55. GRB 170318A: Swift-BAT refined analysis
  56. IceCube-170312A: MASTER follow-up observations
  57. LIGO/Virgo G277583: Asiago spectroscopic classification of ATLAS17byo and ATLAS17cgg
  58. GRB 170317A: LCO FTN observations
  59. LIGO/Virgo G277583 : MAXI/GSC observations
  60. GRB 170317A: MITSuME Okayama Optical Observation
  61. GRB 170317A: Swift-BAT refined analysis
  62. LIGO/Virgo G277583: AstroSat CZTI upper limits
  63. GRB 170317A: MITSuME Okayama Ks-band upper-limit
  64. GRB 170317A : Xinglong TNT optical observation
  65. LIGO/Virgo G277583: Swift/BAT data search
  66. LIGO/Virgo G277583: Discovery Channel Telescope Follow-Up of ATLAS17cck
  67. LIGO/Virgo G277583: ATLAS coverage and transients over the first 2 days
  68. LIGO/Virgo G277583: ATLAS17cck is likely a minor planet
  69. LIGO/Virgo G275697: DLT40 follow-up observation
  70. LIGO/Virgo G274296: DLT40 follow-up observation
  71. LIGO/Virgo G275697: Fermi-LAT search for a high-energy gamma-ray counterpart
  72. GRB 170311B: AstroSat CZTI detection
  73. LIGO/Virgo G277583: SVOM/Mini-GWAC observations of the initial skymap
  74. LIGO/Virgo G275404: Medicina radio follow-up of near-infrared
  75. LIGO/Virgo G277583: INTEGRAL was inactive at the time of the event
  76. LIGO/Virgo G277583 ANTARES search
  77. Konus-Wind observation of GRB 170311B
  78. LIGO/Virgo G277583: AGILE GRID observations
  79. LIGO/Virgo G277583: AGILE MCAL observations
  80. LIGO/Virgo G270580: optical observations and classification of PS and MASTER sources
  81. LIGO/Virgo G277583: IceCube neutrino observations
  82. LIGO/Virgo G277583: Identification of a GW Burst Candidate
  83. IPN Triangulation of GRB 170311B (long/very intense)
  84. IceCube-170312A - IceCube update on a high-energy neutrino candidate event
  85. INTEGRAL observation of IceCube HESE 65274589 129281
  86. GRB 170311A: Swift-BAT refined analysis
  87. SN MASTER OT J042250.16-820415.4 is the possible optical counterpart of the gravitational waves event LIGO/Virgo G274296
  88. GRB 170311A: MASTER-OAFA early optical observations
  89. GRB 170309A: POLAR Observation
  90. GRB 170306A: GROND afterglow detection
  91. LIGO/Virgo G275404: Updated localization from LIGO data
  92. GRB 170307A (trigger 741528): Swift-BAT refined analysis
  93. Swift trigger 741567: MASTER red star flare detection
  94. GRB 170307A: Fermi GBM observation
  95. LIGO/Virgo G275404 and AGL J1914+1043: INTEGRAL follow-up
  96. LIGO/Virgo G275697: Updated localization from LIGO data
  97. Swift Trigger 741528: a possible GRB
  98. Konus-Wind observation of GRB 170306B
  99. GRB 170306B: Swift-XRT observations
  100. GRB 170306A, Swift-BAT refined analysis

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