Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

26363 results found.

  1. Insight-HXMT's continued observation plan for SGR J1935+2154
  2. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  3. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  4. GRB 200509A: Swift-BAT refined analysis
  5. GRB 200510A: BALROG localization (Fermi Trigger 610800081 / GRB 200510445)
  6. GRB 200509A: GROWTH-India r band upper limits
  7. GRB 200509A: Swift/UVOT Detection
  8. GRB 200509A: LCO Optical Afterglow Detection
  9. GRB 200509A: Swift-XRT refined Analysis
  10. GRB 200509A: Enhanced Swift-XRT position
  11. GRB 200509A: Zadko observatory - Gingin optical upper limits
  12. GRB 200509A: Swift detection of a burst with a possible optical counterpart
  13. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  14. Swift Detection of a burst from SGR Swift J1818.0-1607
  15. Swift GRB200506.73: Global MASTER-Net observations report
  16. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  17. GRB 200502A: AstroSat CZTI detection
  18. GRB 200503B: BALROG localization (Fermi Trigger 610219118 / GRB 200503721)
  19. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  20. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  21. GRB 200424A: Swift-XRT afterglow detection
  22. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  23. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  24. GRB 200501A: Fermi GBM Final Real-time Localization
  25. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  26. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  27. A Forest of Bursts from SGR 1935+2154
  28. SGR 1935+2154 the Insight-HXMT observation plan
  29. IceCube-200425A: No significant detection in HAWC
  30. IceCube-200425A: Upper limits from a search for additional neutrino events in IceCube
  31. Fermi-LAT Gamma-ray Observations of IceCube-200425A
  32. IceCube-200425A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  33. GRB 200425A: Swift-BAT refined analysis
  34. GRB 200424A: Swift/UVOT Upper Limits
  35. GRB 200425A: LCO Optical Upper Limits
  36. GRB 200425A: Swift/UVOT Upper Limits
  37. GRB 200424A: AstroSat CZTI detection
  38. GRB 200425A: Swift-XRT refined Analysis
  39. GRB 200424A: Swift-XRT observations
  40. GRB 200425A: Enhanced Swift-XRT position
  41. GRB 200425A: Swift detection of a burst
  42. GRB 200424A: LCO Optical Upper Limit
  43. IPN Triangulation of a bright burst from SGR 1935+2154
  44. IceCube-200421A: Upper limits from a search for additional neutrino events in IceCube
  45. GRB 200415A: ASIM observation
  46. GRB 200410A: Liverpool Telescope First Hour Observations
  47. Fermi-LAT Gamma-ray Observations of IceCube-200421A
  48. IceCube-200421A: No Neutrino Counterpart in ANTARES data
  49. IceCube-200421A: No significant detection in HAWC
  50. IceCube-200421A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  51. GRB 200412B: continued Mondy and Terskol optical observations
  52. GRB 200412B: continued Terskol optical observations
  53. GRB 200412B: continued AbAO, Mondy, TSHAO, Terskol optical observations
  54. GRB 200410A: Optical upper limit
  55. GRB 200416A: Swift/UVOT Detection
  56. GRB 200416A: Swift-BAT refined analysis
  57. GRB 200412B: Swift XRT confirmation of afterglow and UVOT upper limits
  58. GRB 200415A: MASTER imspection and possible localisation
  59. GRB200412B: GROWTH India detection of afterglow
  60. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  61. GRB 200416A: Swift-XRT refined Analysis
  62. GRB 200412B: continued Tautenburg observations
  63. GRB 200416A: Fermi GBM observation
  64. GRB 200416A: Swift detection of a burst with an optical afterglow
  65. GRB 200415A: Fermi GBM observation
  66. IPN triangulation of GRB 200415A (possible Magnetar Giant Flare in Sculptor Galaxy?)
  67. GRB 200412B: Mondy optical observations
  68. GRB 200412B: continued Tautenburg observations
  69. GRB 200415A: BALROG localization (Fermi Trigger 608633290 / GRB 200415367)
  70. GRB 200410A: Swift-BAT refined analysis
  71. GRB 200412B: Tautenburg observations
  72. GRB 200412B: contunued AbAO optical observations
  73. GRB 200412B: SAO RAS observations of OT
  74. IceCube-200410A: No significant detection in HAWC
  75. GRB 200412B: Tautenburg observations
  76. GRB 200412B: AbAO optical observations
  77. GRB 200412B: Insight-HXMT/HE detection
  78. IceCube-200410A : Upper limits from Insight-HXMT/HE observations
  79. GRB 200412B: Swift-XRT afterglow detection
  80. Fermi GRB 200412A: Global MASTER-Net observations report
  81. GRB 200412B: Fermi GBM detection
  82. IceCube-200410A: Upper limits from a search for additional neutrino events in IceCube
  83. GRB 200412A: Fermi GBM detection
  84. GRB 200412B: BALROG localization (Fermi Trigger 608375325 / GRB 200412381)
  85. GRB 200412A: BALROG localization (Fermi Trigger 608367436 / GRB 200412290)
  86. GRB 200411A: Swift-BAT refined analysis
  87. Fermi-LAT Gamma-ray Observations of IceCube-200410A
  88. GRB 200411A: Swift-XRT refined Analysis
  89. GRB 200411A: Swift/UVOT Upper Limits
  90. GRB 200411A: Enhanced Swift-XRT position
  91. IceCube-200410A: Possible associated excess in INTEGRAL SPI-ACS prompt observation
  92. GRB 200411A: Swift detection of a short burst
  93. GRB 200410A: Swift/UVOT Detection
  94. LIGO/Virgo S200225q: Swift XRT observations, 1 X-ray sources
  95. LIGO/Virgo S200224ca: Swift XRT observations, 8 X-ray sources
  96. GRB 200410A: Swift-XRT refined Analysis
  97. GRB 200410A: Enhanced Swift-XRT position
  98. GRB 200409A: Swift-BAT refined analysis
  99. GRB 200410A: Swift detection of a burst with a possible optical counterpart
  100. GRB 200405B: ATCA follow-up and ASKAP limits on pre-burst radio emission

Advanced

Download all Circulars as a .tar.gz archive:
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