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"

36310 results found.

  1. GRB980703: Spectrum of the proposed optical counterpart
  2. GRB980703 Transient Optical Follow-Up
  3. GRB980703: LOTIS observation at early times
  4. GRB980613 Optical Observations
  5. GRB 980703
  6. GRB 980703 H-band Observations
  7. GRB980703 (optical R observations)
  8. GRB980706
  9. GRB980703: radio source/optical transient
  10. BeppoSAX NFI observations of GRB 980703
  11. GRB 980703: ASM Position & Intensity
  12. GRB980703
  13. GRB980703 optical followup
  14. GRB 980613 Near-IR observations
  15. GRB980613, optical observations
  16. GRB 980613: Optical transient and its host galaxy
  17. GRB 980613: Detection of the probable host galaxy
  18. GRB 980613: BATSE Observations
  19. GRB 980613 Optical Observations
  20. GRB 980613 optical observations
  21. GRB980613 Optical Observations
  22. GRB980613 observations from Palomar
  23. GRB980613 BeppoSAX-NFI follow up
  24. GRB 980613 new optical/IR observations
  25. GRB 980613 optical/IR obs.
  26. GRB980613 Near Infra-Red Observations
  27. GRB980611
  28. GRB980613, BeppoSAX WFC positions
  29. GRB971214 Secondary Standards
  30. GRB980519 Secondary Standards
  31. BATSE on-board GRB trigger change
  32. GRB 980519 Optical Observations
  33. GRB980519 optical observations
  34. GRB 980519
  35. GRB980519 optical observations
  36. GRB 980519 Optical Observations
  37. GRB980519 BATSE Observations
  38. GRB970519, optical follow-up at Schmidt Calern
  39. GRB980519 optical observations
  40. GRB980519 Optical Observations
  41. GRB980519 Optical Observations
  42. GRB980519 IPN POSITION
  43. GRB980519 Optical Observations
  44. GRB 980519 Optical Observations
  45. GRB980519 optical observations
  46. GRB980515, BeppoSAX IAUC to be submitted
  47. BATSE on-board GRB trigger change
  48. BeppoSAX GRB ALERT: updated position of grb980515
  49. GRB 980425 Radio Light Curve
  50. GRB 980425 Brightness Temperature
  51. IPN web site of GRBs
  52. GRB980425 BATSE observations
  53. SAX J0840.7+2248 Optical Observations
  54. GRB 980425 optical observations
  55. GRB980425: optical obs.
  56. GRB980425: Radio Observations
  57. GRB 980425 optical observations
  58. GRB 980425 optical observations
  59. GRB 980329 ROSAT observation
  60. GRB980326 X-ray Observations
  61. GRB980326, optical observations
  62. GRB980326, optical observations
  63. GRB980329, Fading IR counterpart to radio source
  64. GRByymmdd, Announcement of automation
  65. GRB980326 IPN annulus
  66. GRB980329 sub-millimeter observations
  67. GRB980329 IPN annulus
  68. GRB980329 near-IR observations
  69. GRB980326 optical observations
  70. GRB980329 optical observations
  71. GRB980329 VLA observations
  72. GRB980329 near IR observations
  73. GRB980329 optical observations
  74. GRB980329 optical observations
  75. GRB980326 optical observations
  76. GRB980326 optical observations
  77. GRB970508 SAO RAS optical observations
  78. Optical Observations of GRB 970508
  79. GRB 971214: Redshift from Keck Observations
  80. Near-IR follow-up on GRB 971227
  81. GRB971214: Keck R & I-band Observations
  82. GRB 971227: Optical Observations
  83. Optical Observations of the GRB 971227 field
  84. Optical Observations on GRB 971227
  85. GRB971227: Plaskett R-band observations
  86. GRB 971227: Optical clarifications
  87. Optical Observations for GRB 971227
  88. GRB971227: Further CAHA R-band images
  89. GRB971227: LOTIS observations
  90. GRB 971227: CAHA R-band images
  91. GRB 971227: Optical observations
  92. Sub-millimeter Observations of GRB 971214 at the JCMT
  93. GRB 971214: EUVE Observations
  94. GRB 971214: Redshift from Keck Optical Observations
  95. GRB 971214: Redshift from Keck Optical Observations
  96. GRB 971214: Apache Point Observatory Optical Observations
  97. GRB 971214: KPNO Optical Observations
  98. Optical Observations of GRB 971214 at Keck
  99. GRB 971214: Optical Observations
  100. Radio Observations of GRB 971214 at the VLA

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