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. GRB 171010A: Fermi-LAT detection
  2. LIGO/Virgo G298048/GW170817: updated localization from parameter estimation
  3. GRB 171007A: Swift-BAT refined analysis
  4. GRB 171007A: Fermi GBM observation
  5. GRB 171004A: Swift-BAT refined analysis
  6. GRB 170710A: LCO Observations
  7. GRB 171004A: Swift detection of a burst
  8. LIGO/Virgo G299232: MAGIC Cherenkov Telescopes observations
  9. LIGO/Virgo G299232: LOFAR follow-up
  10. GRB 171003A: LT early optical observations
  11. GRB 171003A: Swift detection of a burst or a Galactic Transient
  12. GRB 171001A: Swift-BAT refined analysis
  13. GRB 171001A: IRSF Observation
  14. GRB 171001A: Swift detection of a burst
  15. 3.6m Devasthal Optical Telescope observations of GRB 170428A
  16. LIGO/Virgo G299232/GW170825: serendipitous XMM-Newton slew observations
  17. LIGO/Virgo G298936/GW170823: serendipitous XMM-Newton slew observations
  18. LIGO/Virgo G297595/GW170814: updated localization from parameter estimation
  19. LIGO/VIRGO G298048: Further MeerKAT observations of SSS17a
  20. GRB 170728B: Kottamia R-band observation
  21. LIGO/Virgo G298048: MWA Observations of Error Region
  22. Konus-Wind observation of GRB 170921B
  23. IceCube-170922A: HAWC follow-up
  24. Search for counterpart to IceCube-170922A with ANTARES
  25. GRB 170906A: Insight-HXMT detection
  26. GRB 170921C: Insight-HXMT detection
  27. IPN Triangulation of GRB 170921B
  28. INTEGRAL SPI-ACS observation of AMON IceCube-170922A
  29. IceCube-170922A - IceCube observation of a high-energy neutrino candidate event
  30. LIGO/Virgo G298048: SRT observations of SSS17a in NGC 4993
  31. GRB 170921A: Swift-BAT refined analysis
  32. GRB 170921A: LCO 2m telescope observations
  33. GRB 170921A: MITSuME Okayama upper limits
  34. GRB 170921B: Fermi GBM detection
  35. LIGO/Virgo G298048: TOROS photometry of SSS17a
  36. LIGO/Virgo G298048: Desert Fireball Network simultaneous optical observations of the SSS17a/DLT17ck.
  37. LIGO/Virgo G298048: Danish Telescope Observations of SSS17a/DLT17ck
  38. LIGO/Virgo G298048: ATLAS pre-discovery limits 601 to 16 days before first detection of SSS17a/DLT17ck
  39. LIGO/Virgo G297595: LSGT observation of nearby galaxies
  40. LIGO/Virgo G298048: AST3-2 observations of SSS17a/DLT17ck from Antarctica
  41. GRB 170912B: Swift-BAT refined analysis
  42. LIGO/Virgo G297595: DLT40 follow-up observation
  43. GRB 170912A: Swift-BAT refined analysis
  44. LIGO/Virgo G299232: Khureltogot observations
  45. GRB 170912B: Fermi GBM observations
  46. LIGO/Virgo G298936: Konus-Wind observations
  47. LIGO/Virgo G299232: Konus-Wind observations
  48. GRB 170911A: Fermi GBM observation
  49. LIGO/Virgo G299232: Pierre Auger Observatory follow-up
  50. LIGO/Virgo G298389: Pierre Auger Observatory neutrino follow-up
  51. LIGO/Virgo G297595: Las Cumbres Observatory Optical Follow-Up
  52. Konus-Wind observation of GRB 170906A
  53. Konus-Wind observation of GRB 170906C
  54. GRB 170830B CALET Gamma-Ray Burst Monitor detection
  55. IBAS Alert nr. 7913 is not a real GRB
  56. Konus-Wind observation of GRB 170904A
  57. LIGO/Virgo G298048: VLA radio non-detection
  58. LIGO/Virgo G298048: VLBA upper limits at 8.7GHz for the GW counterpart SSS17a/DLT17ck on August 20-21 UT
  59. LIGO/Virgo G298048: ATCA observations of of SSS17a in NGC 4993
  60. GRB 170906B: Swift-BAT refined analysis
  61. GRB 170906B: Fermi GBM detection
  62. GRB 170906A: Fermi GBM detection
  63. GRB 170906A: Swift-BAT refined analysis
  64. GRB 170906A: Swift-XRT refined Analysis
  65. GRB 170906C: Swift-BAT refined analysis
  66. GRB 170906A: MASTER-OAFA (Argentina) early automatic OT detection
  67. GRB 170906A: Fermi-LAT detection
  68. GRB 170906C: Swift detection of a burst
  69. IPN Triangulation of GRB 170904A (long/very bright)
  70. GRB 170903A: Fermi GBM observation
  71. LIGO/Virgo G298389: Fermi GBM Flux Upper Limits
  72. LIGO/Virgo G299232: LOFAR follow-up
  73. Swift Trigger on continued activity of MAXI J1535-571
  74. GRB 170903A: MITSuME Okayama upper limits
  75. GRB 170903A: Swift-BAT refined analysis
  76. GRB 170903A: Swift detection of a burst
  77. LIGO/Virgo G297595: DECam observations of BBH merger region of interest
  78. GRB 170902A: Swift detection of a burst or possible Galactic transient
  79. LIGO/Virgo G298048: Continued X-ray monitoring and X-ray detection of GW170817 [erratum]]
  80. LIGO/Virgo G298048: AGILE-GRID analysis of data contemporary to X-ray emission from SSS17a in NGC4993
  81. GRB 170831A: Fermi GBM detection
  82. GRB 170830A: Fermi GBM observation
  83. Konus-Wind observation of GRB 170827B
  84. Konus-Wind observation of GRB 170826A
  85. LIGO/Virgo G299232: GRAWITA Asiago optical observations
  86. LIGO/Virgo G299232: continued WHT observations of the field of SwiftJ014008.5+343403.6
  87. LIGO/Virgo G299232 ANTARES search (2)
  88. LIGO/Virgo G298048: GMRT Follow-up of SSS17a at 1.4 GHz
  89. Konus-Wind observation of GRB 170826B
  90. LIGO/Virgo G299232: GRAWITA Campo Imperatore optical observations
  91. LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
  92. GRB 170830A: iTelescope optical observations
  93. LIGO/Virgo G299232: SVOM/2.16-m Optical Telescope Observations of Swift UVOT Transient
  94. LIGO/Virgo G299232: HAWC follow-up
  95. LIGO/Virgo G299232: Further Swift/UVOT Observations of Optical Transient SwiftJ014008.5+343403.6
  96. LIGO/Virgo G299232: WHT non-detection u-band optical transient
  97. IPN Triangulation of GRB 170826B
  98. LIGO/Virgo G299232: PIRATE observations of MASTER OT J033744.97+723159.0
  99. LIGO/Virgo G298936: Updated localization from parameter estimation on LIGO and Virgo data
  100. LIGO/Virgo G298048: Konus-Wind 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