Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26296 results found.

  1. GRB981220 B, R and I band observations
  2. Optical Observations of GRB981226
  3. GRB 981220:Optical Observations
  4. GRB 981226 optical observations
  5. GRB 981220
  6. GRB 981220, radio observations
  7. GRB981220 I-band Observations
  8. GRB 981220
  9. GRB 980326/Host Galaxy
  10. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  11. BeppoSAX NFI Observation of GRB980425
  12. GRB980329 R,I flux calibration and R,I,K upper limits
  13. GRB980425 Optical Follow-up
  14. GRB 980923 BATSE Observations
  15. SGR1900+14, BeppoSAX-GRBM observations
  16. GRB970508 optical observations
  17. GRB971214, association with a Galactic star?
  18. GRB980519, Optical Observations
  19. GRB980703 - BeppoSAX/GRBM detection
  20. GRB980703 optical photometry
  21. GRB 980703: BATSE Observations
  22. GRB980703 optical observations
  23. GRB980703: Radio transient
  24. GRB 980703: Spectrum of the proposed optical counterpart
  25. GRB980703 Transient Optical Follow-Up
  26. GRB980703: LOTIS observation at early times
  27. GRB980613 Optical Observations
  28. GRB980703 (I band observations)
  29. BeppoSAX NFI observations of GRB 980703
  30. GRB980519 observation report
  31. GRB980703 optical followup
  32. Radio observations of SGRs
  33. SGR1900+14 field optical observations
  34. GRB980613, optical observations
  35. GRB 980613: Optical transient and its host galaxy
  36. SGR1627-41, RXTE/ASM observations
  37. GRB 980613: Detection of the probable host galaxy
  38. Reduced error box of SGR 1627-41
  39. GRB 980613: BATSE Observations
  40. GRB 980613 Optical Observations
  41. GRB 980613 optical observations
  42. Discovery of a new SGR source, SGR1627-41
  43. GRB980613 Optical Observations
  44. GRB980613 observations from Palomar
  45. GRB 980613 optical/IR obs.
  46. GRB980613 Near Infra-Red Observations
  47. GRB971214 Secondary Standards
  48. GRB980519 Secondary Standards
  49. BATSE on-board GRB trigger change
  50. GRB 980519 Optical Observations
  51. GRB 980519
  52. GRB980519 optical observations
  53. GRB 980519 Optical Observations
  54. GRB980519 BATSE Observations
  55. GRB980519 Optical Observations
  56. GRB980519 Optical Observations
  57. GRB 980519 Optical Observations
  58. GRB980515, BeppoSAX IAUC to be submitted
  59. BSAX Observations of GRB980425 field
  60. IPN web site of GRBs
  61. GRB980425 BATSE observations
  62. SAX J0840.7+2248 Optical Observations
  63. GRB980425: optical obs.
  64. GRB980425: Radio Observations
  65. report on BSAX observations of GRB980425
  66. GRB 980329 ROSAT observation
  67. GRB980326 X-ray Observations
  68. GRB980326, optical observations
  69. GRB980326, optical observations
  70. GRB980329, Fading IR counterpart to radio source
  71. GRB980329 Keck K-band observations
  72. GRB980329 sub-millimeter observations
  73. GRB980329 optical observations
  74. GRB980329 near-IR observations
  75. GRB980329 near-IR observations
  76. GRB980326 optical observations
  77. GRB980329 optical observations
  78. GRB980329 VLA observations
  79. GRB980329 optical observations
  80. GRB980329 optical observations
  81. GRB980326 optical observations
  82. GRB980326 optical observations
  83. Optical Observations of GRB 970508
  84. Near-IR follow-up on GRB 971227
  85. Optical Observations of the GRB 971227 field
  86. Optical Observations on GRB 971227
  87. GRB971227: Plaskett R-band observations
  88. GRB 971227: Optical clarifications
  89. GRB971227: Further CAHA R-band images
  90. GRB971227: LOTIS observations
  91. GRB971214: Optical Observations and Calibrations
  92. GRB 971214: Optical Observations
  93. Radio Observations of GRB 971214 at the VLA
  94. GRB 971024: Refined analysis by USNOFS Observations
  95. GRB 971024: KPNO Optical Observations
  96. GRB 970828: Palomar 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