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"

37675 results found.

  1. GRB980519 optical observations
  2. GRB 980519 Optical Observations
  3. GRB980519 BATSE Observations
  4. GRB970519, optical follow-up at Schmidt Calern
  5. GRB980519 optical observations
  6. GRB980519 Optical Observations
  7. GRB980519 Optical Observations
  8. GRB980519 IPN POSITION
  9. GRB980519 Optical Observations
  10. GRB 980519 Optical Observations
  11. GRB980519 optical observations
  12. GRB980515, BeppoSAX IAUC to be submitted
  13. BATSE on-board GRB trigger change
  14. BeppoSAX GRB ALERT: updated position of grb980515
  15. GRB 980425 Radio Light Curve
  16. GRB 980425 Brightness Temperature
  17. GRB980425 BATSE observations
  18. SAX J0840.7+2248 Optical Observations
  19. GRB 980425 optical observations
  20. GRB980425: optical obs.
  21. GRB980425: Radio Observations
  22. GRB 980425 optical observations
  23. GRB 980425 optical observations
  24. GRB 980329 ROSAT observation
  25. GRB980326 X-ray Observations
  26. GRB980326, optical observations
  27. GRB980326, optical observations
  28. GRB980329, Fading IR counterpart to radio source
  29. GRByymmdd, Announcement of automation
  30. GRB980326 IPN annulus
  31. GRB980329 sub-millimeter observations
  32. GRB980329 IPN annulus
  33. GRB980329 near-IR observations
  34. GRB980326 optical observations
  35. GRB980329 optical observations
  36. GRB980329 VLA observations
  37. GRB980329 near IR observations
  38. GRB980329 optical observations
  39. GRB980329 optical observations
  40. GRB980326 optical observations
  41. GRB980326 optical observations
  42. GRB970508 SAO RAS optical observations
  43. Optical Observations of GRB 970508
  44. GRB 971214: Redshift from Keck Observations
  45. Near-IR follow-up on GRB 971227
  46. GRB971214: Keck R & I-band Observations
  47. GRB 971227: Optical Observations
  48. Optical Observations of the GRB 971227 field
  49. Optical Observations on GRB 971227
  50. GRB971227: Plaskett R-band observations
  51. GRB 971227: Optical clarifications
  52. Optical Observations for GRB 971227
  53. GRB971227: Further CAHA R-band images
  54. GRB971227: LOTIS observations
  55. GRB 971227: CAHA R-band images
  56. GRB 971227: Optical observations
  57. Sub-millimeter Observations of GRB 971214 at the JCMT
  58. GRB 971214: EUVE Observations
  59. GRB 971214: Redshift from Keck Optical Observations
  60. GRB 971214: Redshift from Keck Optical Observations
  61. GRB 971214: Apache Point Observatory Optical Observations
  62. GRB 971214: KPNO Optical Observations
  63. Optical Observations of GRB 971214 at Keck
  64. GRB 971214: Optical Observations
  65. Radio Observations of GRB 971214 at the VLA
  66. GRB 971214: USNOFS Observations Summary
  67. GRB 971024: KPNO Optical Observations Summary
  68. GRB 971024: Refined analysis by USNOFS Observations
  69. GRB 971024: KPNO Optical Observations
  70. GRB 971024: USNO Observations
  71. GRB 970925: BATSE Localization
  72. IRAS 18119-1342 and the possible new SGR
  73. Possible new SGR from US Naval Observatory
  74. GRB 970828: Palomar Observations
  75. GRB 970228: Keck/LRIS 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