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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"

27391 results found.

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

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