Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

28251 results found.

  1. GRB 180613A: Enhanced Swift-XRT position
  2. GRB 180613A: Possible host galaxy at XRT position, or star
  3. GRB 180613A: Swift detection of a burst
  4. GRB 180611A: Fermi GBM observation
  5. GRB 180605A: Fermi GBM observation
  6. GW170817/GRB170817A: LBT optical detection
  7. GRB 180602B: Fermi GBM detection
  8. GRB 180602A: Swift/UVOT Upper Limits
  9. GRB 180602A: MITSuME Akeno optical upper limits
  10. GRB 180602A: Swift-XRT refined Analysis
  11. GRB 180602A: Swift-BAT refined analysis
  12. GRB 180602A: MITSuME Okayama optical upper limits
  13. GRB 180602A: Enhanced Swift-XRT position
  14. GRB 180602A: Swift detection of a burst
  15. IPN Triangulation of GRB 180529A (short/hard)
  16. Swift Trigger 834937 is not a GRB
  17. IPN Triangulation of GRB 180526A (long)
  18. IPN Triangulation of GRB 180523A
  19. GRB180523B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 548793993)
  20. GRB 180514A: CrAO/ZTSH optical observations and afterglow candidate
  21. GRB 180514A: Swift/UVOT Upper Limits
  22. GRB 180514A: Detection limits from 2.5m NOT
  23. GRB 180510A: MITSuME Ishigakijima optical upper limits
  24. GRB 180514A: 1.5m OSN optical observations
  25. GRB 180514A: GOTO Optical Observations
  26. GRB 180514A: Swift-BAT refined analysis
  27. GRB 180514A: Swift-XRT refined Analysis
  28. GRB 180514A: Enhanced Swift-XRT position
  29. GRB 180512A: VLT/HAWK-I NIR Observations
  30. GRB 180514A: Swift detection of a burst
  31. Konus-Wind observation of GRB 180510A
  32. GRB 180512A: Swift-XRT refined Analysis
  33. GRB 180512A: Swift-BAT refined analysis
  34. GRB 180512A: RATIR Optical Observations
  35. GRB 180512A: LBT optical detection
  36. GRB 180512A: Swift/UVOT Upper Limits
  37. GRB 180512A: Enhanced Swift-XRT position
  38. GRB 180512A: GROND upper limits
  39. GRB 180512A: NOT upper limits
  40. GRB 180512A: OASDG optical observations
  41. GRB 180512A: Upper limits from OSN
  42. GRB 180512A: Swift detection of a burst
  43. GRB 180510A: Swift/UVOT followup observations
  44. GRB 180510B: Swift-XRT refined Analysis
  45. GRB 180510A: Swift-XRT refined Analysis
  46. Swift trigger 831888: misidentification of 4U 1416-62
  47. GRB 180510B: Swift-BAT refined analysis
  48. GRB 180510B: VLT/X-shooter observations
  49. GRB 180510B: GROND detection in all bands
  50. GRB 180510B: TAROT La Silla observatory optical observations
  51. Swift Trigger 831888: a possible GRB or Galactic transient
  52. GRB 180510B: Enhanced Swift-XRT position
  53. GRB 180418A: 15 GHz upper limits from AMI
  54. GRB 180510B: Swift detection of a burst with an optical counterpart
  55. GRB 180510A: Swift detection of a burst
  56. Chandra observations of GW170817 reveal a fading afterglow
  57. Chandra observations of GW170817 260 days since merger: first statistically significant evidence for an X-ray decay
  58. GRB 180504A: Swift/UVOT Upper Limits
  59. GRB 180504A: Swift-BAT refined analysis
  60. GRB 180505A: Fermi GBM detection
  61. GRB 180504A: ePESSTO NTT NIR observations
  62. Correction to Swift-XRT light curve fit for GRB 180504A in GCN 22685
  63. GRB 180504A: Swift-XRT refined Analysis
  64. GRB 180504A: NOT afterglow candidate
  65. GRB 180504A: Swift detection of a burst
  66. IPN Triangulation of GRB 180427A
  67. GRB 180427A: Fermi GBM detection
  68. GRB 180425A: Swift-XRT refined Analysis
  69. GRB 180425A: Swift-BAT refined analysis
  70. GRB 180425A: Swift/UVOT Upper Limits
  71. GRB 180425A: Enhanced Swift-XRT position
  72. GRB 180425A: Swift detection of a burst
  73. GRB 180418A: TAROT La Silla observatory early optical observations
  74. GRB 180418A: MITSuME Ishigakijima Optical Observation
  75. GRB 180418A : SQUEAN observations
  76. GRB 180418A: Further GROND observations
  77. GRB 180418A: Swift/UVOT Detection
  78. GRB 180418A: Continued RATIR Optical Observations
  79. GRB 180418A: Imaging of the optical afterglow with the 1.3 m DFOT and 3.6 m DOT in ARIES, India
  80. GRB 180418A GROND observations
  81. GRB 180418A: Gemini-North imaging and spectroscopy
  82. GRB 180418A: Swift-BAT refined analysis
  83. GRB 180418A: Swift-XRT refined Analysis
  84. GRB 180418A: RATIR Optical Observations
  85. LIGO/Virgo G299232: LOFAR follow-up
  86. GRB 180418A: Enhanced Swift-XRT position
  87. GRB 180418A: Swift-XRT observations
  88. GRB 180416A: Fermi GBM detection
  89. GRB 180409A: Swift-XRT afterglow detection
  90. GRB 180411A: Swift/UVOT Upper Limit
  91. GRB 180411A: Tautenburg observations
  92. GRB 180410A: Fermi GBM observation
  93. GRB 180411A: Fermi GBM detection
  94. GRB 180411A: Swift-BAT refined analysis
  95. GRB 180411A: Swift-XRT refined Analysis
  96. GRB 180410A: RATIR Optical Observations
  97. GRB 180411A: Swift detection of a burst
  98. GRB 180410A: Swift-XRT refined Analysis
  99. GRB 180410A: Swift-BAT refined analysis
  100. GRB 180410A: Swift/UVOT Upper Limits

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