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"

38579 results found.

  1. GRB980519 Optical Observations
  2. GRB 980519 Optical Observations
  3. GRB980519 optical observations
  4. GRB980515, BeppoSAX IAUC to be submitted
  5. BATSE on-board GRB trigger change
  6. GRB980519, BeppoSAX-WFC updated position
  7. GRB980519, BeppoSAX-WFC position
  8. GRB980515: SAX-WFC updated position
  9. BeppoSAX GRB ALERT: updated position of grb980515
  10. GRB 980425 Radio Light Curve
  11. GRB 980425 Brightness Temperature
  12. BSAX Observations of GRB980425 field
  13. IPN web site of GRBs
  14. GRB980425 BATSE observations
  15. SAX J0840.7+2248 Optical Observations
  16. GRB 980425 optical observations
  17. GRB980425: optical obs.
  18. GRB980425: Radio Observations
  19. GRB 980425 optical observations
  20. report on BSAX observations of GRB980425
  21. GRB 980425 optical observations
  22. GRB980326 X-ray Observations
  23. GRB980326, optical observations
  24. GRB980326, optical observations
  25. GRB980329, Fading IR counterpart to radio source
  26. GRByymmdd, Announcement of automation
  27. GRB980326 IPN annulus
  28. GRB980329
  29. GRB980329 Keck K-band observations
  30. GRB980329 sub-millimeter observations
  31. GRB980329 IPN annulus
  32. GRB980329 optical observations
  33. GRB980329 near-IR observations
  34. GRB980329 near-IR observations
  35. GRB980329 optical observations
  36. GRB980329 infrared observations
  37. GRB980329 optical observations
  38. GRB980326 optical observations
  39. GRB980329 optical observations
  40. GRB980329 VLA observations
  41. GRB980329 near IR observations
  42. GRB980329 optical observations
  43. GRB980329 optical observations
  44. GRB980329 optical observations
  45. GRB980326 optical observations
  46. GRB980326 optical observations
  47. GRB980326 optical observations
  48. GRB980326 optical observations
  49. GRB970508 SAO RAS optical observations
  50. Optical Observations of GRB 970508
  51. GRB 971214: Redshift from Keck Observations
  52. Near-IR follow-up on GRB 971227
  53. GRB971214: Keck R & I-band Observations
  54. Optical Observations of the GRB 971227 field
  55. Optical Observations on GRB 971227
  56. GRB971227: Plaskett R-band observations
  57. GRB 971227: Optical clarifications
  58. GRB971227: Further CAHA R-band images
  59. GRB971227: LOTIS observations
  60. GRB 971227: CAHA R-band images
  61. GRB 971227: Optical observations
  62. GRB971214: Optical Observations and Calibrations
  63. Sub-millimeter Observations of GRB 971214 at the JCMT
  64. GRB 971214: Redshift from Keck Optical Observations
  65. GRB 971214: Redshift from Keck Optical Observations
  66. GRB 971214: Apache Point Observatory Optical Observations
  67. GRB 971214: KPNO Optical Observations
  68. Optical Observations of GRB 971214 at Keck
  69. GRB 971214: Optical Observations
  70. Radio Observations of GRB 971214 at the VLA
  71. GRB 971214: USNOFS Observations Summary
  72. GRB 971024: KPNO Optical Observations Summary
  73. GRB 971024: KPNO Optical Observations
  74. GRB 971024: USNO Observations
  75. IRAS 18119-1342 and the possible new SGR
  76. Possible new SGR from US Naval Observatory
  77. RXTE Observations of SGR 1814-13
  78. GRB 970828: Palomar Observations
  79. 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