Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

44399 results found.

  1. SGR1900+14
  2. BATSE on-board GRB trigger change
  3. GRB 980519 Optical Observations
  4. GRB980519 optical observations
  5. GRB980519 I-band observations
  6. GRB 980519
  7. GRB980519 optical observations
  8. GRB 980519 Optical Observations
  9. GRB980519 BATSE Observations
  10. GRB970519, optical follow-up at Schmidt Calern
  11. GRB980519 optical observations
  12. GRB980519 Optical Observations
  13. GRB980519 Optical Observations
  14. GRB980519 IPN POSITION
  15. GRB980519 Optical Observations
  16. GRB 980519 Optical Observations
  17. GRB980519 optical observations
  18. GRB980515, BeppoSAX IAUC to be submitted
  19. BATSE on-board GRB trigger change
  20. GRB980519, BeppoSAX-WFC updated position
  21. GRB980519, BeppoSAX-WFC position
  22. GRB980515: SAX-WFC updated position
  23. BeppoSAX GRB ALERT: updated position of grb980515
  24. GRB 980425 Radio Light Curve
  25. GRB 980425 Brightness Temperature
  26. BSAX Observations of GRB980425 field
  27. IPN web site of GRBs
  28. GRB980425 BATSE observations
  29. SAX J0840.7+2248 Optical Observations
  30. GRB 980425 optical observations
  31. GRB980425: optical obs.
  32. GRB980425: Radio Observations
  33. GRB 980425 optical observations
  34. report on BSAX observations of GRB980425
  35. GRB 980425 optical observations
  36. GRB 980329 ROSAT observation
  37. GRB980326 X-ray Observations
  38. GRB980326, optical observations
  39. GRB980326, optical observations
  40. GRB980329, Fading IR counterpart to radio source
  41. GRByymmdd, Announcement of automation
  42. GRB980326 IPN annulus
  43. GRB980329
  44. GRB980329 Keck K-band observations
  45. GRB980329 sub-millimeter observations
  46. GRB980329 IPN annulus
  47. GRB980329 optical observations
  48. GRB980329 near-IR observations
  49. GRB980329 near-IR observations
  50. GRB980329 optical observations
  51. GRB980329 infrared observations
  52. GRB980329 optical observations
  53. GRB980326 optical observations
  54. GRB980329 optical observations
  55. GRB980329 VLA observations
  56. GRB980329 near IR observations
  57. GRB980329 optical observations
  58. GRB980329 optical observations
  59. GRB980329 optical observations
  60. GRB980326 optical observations
  61. GRB980326 optical observations
  62. GRB980326 optical observations
  63. GRB980326 optical observations
  64. GRB970508 SAO RAS optical observations
  65. Optical Observations of GRB 970508
  66. GRB 971214: Redshift from Keck Observations
  67. Near-IR follow-up on GRB 971227
  68. GRB971214: Keck R & I-band Observations
  69. GRB 971227: Optical Observations
  70. Optical Observations of the GRB 971227 field
  71. Optical Observations on GRB 971227
  72. GRB971227: Plaskett R-band observations
  73. GRB 971227: Optical clarifications
  74. Optical Observations for GRB 971227
  75. GRB971227: Further CAHA R-band images
  76. GRB971227: LOTIS observations
  77. GRB 971227: CAHA R-band images
  78. GRB 971227: Optical observations
  79. GRB971214: Optical Observations and Calibrations
  80. Sub-millimeter Observations of GRB 971214 at the JCMT
  81. GRB 971214: EUVE Observations
  82. GRB 971214: Redshift from Keck Optical Observations
  83. GRB 971214: Redshift from Keck Optical Observations
  84. GRB 971214: Apache Point Observatory Optical Observations
  85. GRB 971214: KPNO Optical Observations
  86. Optical Observations of GRB 971214 at Keck
  87. GRB 971214: Optical Observations
  88. Radio Observations of GRB 971214 at the VLA
  89. GRB 971214: USNOFS Observations Summary
  90. GRB 971024: KPNO Optical Observations Summary
  91. GRB 971024: Refined analysis by USNOFS Observations
  92. GRB 971024: KPNO Optical Observations
  93. GRB 971024: USNO Observations
  94. GRB 970925: BATSE Localization
  95. IRAS 18119-1342 and the possible new SGR
  96. Possible new SGR from US Naval Observatory
  97. RXTE Observations of SGR 1814-13
  98. GRB 970828: Palomar Observations
  99. GRB 970228: Keck/LRIS Optical Observations

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