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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"

23410 results found.

  1. GRB 990123: Possible Gravitationally Lensed Burst?
  2. GRB990123, optical observation
  3. GRB 990123 optical observations
  4. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  5. GRB 990123 radio observations
  6. GRB 990123: Optical Decay Slope
  7. GRB 990123 r-band photometry
  8. GRB 990123 Optical Follow-up
  9. GRB990123, early optical counterpart detection
  10. GRB990123 Optical Observation
  11. Possible identification of SN1999E with GRB980910
  12. Optical Observations of GRB 981220
  13. GRB 981226: radio variable
  14. GRB981220, Optical Observations
  15. GRB 981226 Optical Observations
  16. GRB981226 Optical Observations
  17. GRB981226 BeppoSAX follow up
  18. GRB 981226
  19. GRB 981226 optical observations
  20. GRB981220 B, R and I band observations
  21. Optical Observations of GRB981226
  22. GRB 981220:Optical Observations
  23. GRB 981226 - Infrared Observations
  24. GRB 981226 optical observations
  25. GRB 981220, radio observations
  26. GRB 981220
  27. GRB 980326/Host Galaxy
  28. GRB981220 IPN error box
  29. BeppoSAX NFI Observation of GRB980425
  30. GRB980329 R,I flux calibration and R,I,K upper limits
  31. GRB980425 Optical Follow-up
  32. GRB980425: X-ray revised positions
  33. GRB 980923 BATSE Observations
  34. GRB970508 optical observations
  35. GRB971214, association with a Galactic star?
  36. GRB980519, Optical Observations
  37. GRB980703 - BeppoSAX/GRBM detection
  38. GRB 980703 (NFI observations)
  39. GRB980703 optical photometry
  40. GRB980703 optical observations
  41. GRB980703: Radio transient
  42. RXTE Observation of GRB 980706
  43. GRB980703 Transient Optical Follow-Up
  44. GRB980703: LOTIS observation at early times
  45. GRB980613 Optical Observations
  46. GRB 980703
  47. BeppoSAX NFI observations of GRB 980703
  48. GRB980703 optical followup
  49. Radio observations of SGRs
  50. SGR1900+14 field optical observations
  51. GRB 980613 Near-IR observations
  52. GRB 980613: Optical transient and its host galaxy
  53. SGR1627-41, RXTE/ASM observations
  54. GRB 980613: Detection of the probable host galaxy
  55. GRB 980613 Optical Observations
  56. GRB 980613 optical observations
  57. Discovery of a new SGR source, SGR1627-41
  58. GRB980613 Optical Observations
  59. GRB980613 observations from Palomar
  60. GRB980613 Near Infra-Red Observations
  61. GRB971214 Secondary Standards
  62. GRB980519 Secondary Standards
  63. BATSE on-board GRB trigger change
  64. GRB 980519 Optical Observations
  65. GRB980519 optical observations
  66. GRB 980519
  67. GRB980519 optical observations
  68. GRB 980519 Optical Observations
  69. GRB980519 Optical Observations
  70. GRB 980519 Optical Observations
  71. GRB980515, BeppoSAX IAUC to be submitted
  72. BATSE on-board GRB trigger change
  73. GRB980519, BeppoSAX-WFC updated position
  74. GRB980515: SAX-WFC updated position
  75. GRB 980425 Radio Light Curve
  76. BSAX Observations of GRB980425 field
  77. IPN web site of GRBs
  78. SAX J0840.7+2248 Optical Observations
  79. GRB980425: optical obs.
  80. GRB980425: Radio Observations
  81. report on BSAX observations of GRB980425
  82. GRB 980329 ROSAT observation
  83. GRB980326 X-ray Observations
  84. GRB980326, optical observations
  85. GRB980326, optical observations
  86. GRB980329
  87. GRB980329 Keck K-band observations
  88. GRB980326 optical observations
  89. GRB980329 optical observations
  90. GRB980329 VLA observations
  91. GRB980329 optical observations
  92. GRB980326 optical observations
  93. GRB980326 optical observations
  94. GRB980326 optical observations
  95. Optical Observations of GRB 970508
  96. Near-IR follow-up on GRB 971227
  97. Optical Observations of the GRB 971227 field
  98. Optical Observations on GRB 971227
  99. GRB971227: Plaskett R-band observations
  100. GRB 971227: Optical clarifications

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