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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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

23217 results found.

  1. Possible identification of SN1999E with GRB980910
  2. Optical Observations of GRB 981220
  3. GRB 981226: radio variable
  4. GRB981220
  5. GRB 981220 Optical observations
  6. GRB 981226 Optical Observations
  7. GRB981226 Optical Observations
  8. GRB981226 BeppoSAX follow up
  9. GRB 981226
  10. GRB 981226 optical observations
  11. Optical Observations of GRB981226
  12. GRB 981220:Optical Observations
  13. GRB 981226 optical observations
  14. GRB 981220
  15. GRB 981220, radio observations
  16. GRB 981220
  17. GRB 981220, optical observations
  18. GRB 980326/Host Galaxy
  19. GRB981220 IPN error box
  20. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  21. BeppoSAX NFI Observation of GRB980425
  22. GRB980329 R,I flux calibration and R,I,K upper limits
  23. GRB980425 Optical Follow-up
  24. GRB 980923 BATSE Observations
  25. GRB980703 Very Long Baseline Interferometry
  26. GRB970508 optical observations
  27. GRB980519, Optical Observations
  28. GRB980703 - BeppoSAX/GRBM detection
  29. GRB 980703 (NFI observations)
  30. GRB980703 optical photometry
  31. GRB 980703: BATSE Observations
  32. GRB980703 optical observations
  33. GRB980703: Radio transient
  34. GRB 980703: Spectrum of the proposed optical counterpart
  35. RXTE Observation of GRB 980706
  36. GRB980703 Transient Optical Follow-Up
  37. GRB980703: LOTIS observation at early times
  38. GRB980613 Optical Observations
  39. GRB 980703
  40. GRB980703 (optical R observations)
  41. BeppoSAX NFI observations of GRB 980703
  42. GRB 980703: ASM Position & Intensity
  43. GRB980703 optical followup
  44. Radio observations of SGRs
  45. SGR1900+14 field optical observations
  46. GRB 980613: Optical transient and its host galaxy
  47. SGR1627-41, RXTE/ASM observations
  48. GRB 980613: Detection of the probable host galaxy
  49. GRB 980613: BATSE Observations
  50. GRB 980613 Optical Observations
  51. GRB 980613 optical observations
  52. Discovery of a new SGR source, SGR1627-41
  53. GRB980613 Optical Observations
  54. GRB980613 observations from Palomar
  55. GRB980613 Near Infra-Red Observations
  56. GRB980613, BeppoSAX WFC positions
  57. GRB971214 Secondary Standards
  58. GRB980519 Secondary Standards
  59. SGR1900+14
  60. SGR1900+14
  61. BATSE on-board GRB trigger change
  62. GRB 980519 Optical Observations
  63. GRB 980519
  64. GRB980519 optical observations
  65. GRB 980519 Optical Observations
  66. GRB980519 BATSE Observations
  67. GRB980519 Optical Observations
  68. GRB 980519 Optical Observations
  69. GRB980519 optical observations
  70. GRB980515, BeppoSAX IAUC to be submitted
  71. BATSE on-board GRB trigger change
  72. GRB980519, BeppoSAX-WFC updated position
  73. BeppoSAX GRB ALERT: updated position of grb980515
  74. BSAX Observations of GRB980425 field
  75. IPN web site of GRBs
  76. GRB980425 BATSE observations
  77. SAX J0840.7+2248 Optical Observations
  78. GRB980425: optical obs.
  79. GRB980425: Radio Observations
  80. report on BSAX observations of GRB980425
  81. GRB 980329 ROSAT observation
  82. GRB980326 X-ray Observations
  83. GRB980326, optical observations
  84. GRB980326, optical observations
  85. GRB980329
  86. GRB980329 Keck K-band observations
  87. GRB980329 sub-millimeter observations
  88. GRB980329 IPN annulus
  89. GRB980329 optical observations
  90. GRB980329 near-IR observations
  91. GRB980326 optical observations
  92. GRB980329 optical observations
  93. GRB980329 VLA observations
  94. GRB980329 optical observations
  95. GRB980326 optical observations
  96. GRB980326 optical observations
  97. GRB980326 optical observations
  98. GRB970508 SAO RAS optical observations
  99. Optical Observations of GRB 970508
  100. Near-IR follow-up on GRB 971227

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