Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

45436 results found.

  1. GRB 980703 H-band Observations
  2. GRB980703 (optical R observations)
  3. GRB980706
  4. GRB980703: radio source/optical transient
  5. BeppoSAX NFI observations of GRB 980703
  6. GRB 980703: ASM Position & Intensity
  7. GRB980703
  8. GRB980519 observation report
  9. GRB980703 optical followup
  10. SGR1627-41
  11. Radio observations of SGRs
  12. SGR1900+14 field optical observations
  13. GRB 980613 Near-IR observations
  14. GRB980613, optical observations
  15. GRB 980613: Optical transient and its host galaxy
  16. SGR1627-41, RXTE/ASM observations
  17. SGR1627-41, Refined IPN annulus location
  18. GRB 980613: Detection of the probable host galaxy
  19. Reduced error box of SGR 1627-41
  20. GRB 980613: BATSE Observations
  21. SGR1627-41, BeppoSAX-GRBM detections
  22. SGR 1627-41
  23. GRB 980613 Optical Observations
  24. GRB 980613 optical observations
  25. Discovery of a new SGR source, SGR1627-41
  26. GRB980613 Optical Observations
  27. GRB980613 observations from Palomar
  28. GRB980613 BeppoSAX-NFI follow up
  29. GRB 980613 new optical/IR observations
  30. GRB 980613 optical/IR obs.
  31. GRB980613 Near Infra-Red Observations
  32. GRB980611
  33. GRB980613, BeppoSAX WFC positions
  34. GRB971214 Secondary Standards
  35. SGR 1900+14
  36. GRB980519 Secondary Standards
  37. SGR1900+14
  38. SGR1900+14
  39. BATSE on-board GRB trigger change
  40. GRB 980519 Optical Observations
  41. GRB980519 optical observations
  42. GRB980519 I-band observations
  43. GRB 980519
  44. GRB980519 optical observations
  45. GRB 980519 Optical Observations
  46. GRB980519 BATSE Observations
  47. GRB970519, optical follow-up at Schmidt Calern
  48. GRB980519 optical observations
  49. GRB980519 Optical Observations
  50. GRB980519 Optical Observations
  51. GRB980519 IPN POSITION
  52. GRB980519 Optical Observations
  53. GRB 980519 Optical Observations
  54. GRB980519 optical observations
  55. GRB980515, BeppoSAX IAUC to be submitted
  56. BATSE on-board GRB trigger change
  57. GRB980519, BeppoSAX-WFC updated position
  58. GRB980519, BeppoSAX-WFC position
  59. GRB980515: SAX-WFC updated position
  60. BeppoSAX GRB ALERT: updated position of grb980515
  61. GRB 980425 Radio Light Curve
  62. GRB 980425 Brightness Temperature
  63. BSAX Observations of GRB980425 field
  64. IPN web site of GRBs
  65. GRB980425 BATSE observations
  66. SAX J0840.7+2248 Optical Observations
  67. GRB 980425 optical observations
  68. GRB980425: optical obs.
  69. GRB980425: Radio Observations
  70. GRB 980425 optical observations
  71. report on BSAX observations of GRB980425
  72. GRB 980425 optical observations
  73. GRB 980329 ROSAT observation
  74. GRB980326 X-ray Observations
  75. GRB980326, optical observations
  76. GRB980326, optical observations
  77. GRB980329, Fading IR counterpart to radio source
  78. GRByymmdd, Announcement of automation
  79. GRB980326 IPN annulus
  80. GRB980329
  81. GRB980329 Keck K-band observations
  82. GRB980329 sub-millimeter observations
  83. GRB980329 IPN annulus
  84. GRB980329 optical observations
  85. GRB980329 near-IR observations
  86. GRB980329 near-IR observations
  87. GRB980329 optical observations
  88. GRB980329 infrared observations
  89. GRB980329 optical observations
  90. GRB980326 optical observations
  91. GRB980329 optical observations
  92. GRB980329 VLA observations
  93. GRB980329 near IR observations
  94. GRB980329 optical observations
  95. GRB980329 optical observations
  96. GRB980329 optical observations
  97. GRB980326 optical observations
  98. GRB980326 optical observations
  99. GRB980326 optical observations
  100. GRB980326 optical 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