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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"

27323 results found.

  1. "GRB 990123: New BV Observations"
  2. GRB 990123 Optical Follow-Up
  3. GRB 990123: BATSE Observations
  4. GRB990123 Optical Observations
  5. GRB 990123: New Optical Observations, Decay Measure
  6. GRB 990123 Optical Follow-Up
  7. GRB 990123: Possible Gravitationally Lensed Burst?
  8. GRB990123, optical observation
  9. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  10. GRB990123, Optical observation
  11. GRB 990123: Optical Decay Slope
  12. GRB 990123 r-band photometry
  13. GRB 990123 Optical Follow-up
  14. GRB990123, early optical counterpart detection
  15. GRB990123 Optical Observation
  16. Possible identification of SN1999E with GRB980910
  17. Optical Observations of GRB 981220
  18. GRB 981226: radio variable
  19. GRB981220
  20. GRB981220, Correction to GCN 179
  21. GRB 981220 Optical observations
  22. GRB 981226 Optical Observations
  23. GRB 981220 and GRB 981226, optical observations
  24. GRB981226 Optical Observations
  25. GRB981226 BeppoSAX follow up
  26. GRB 981226
  27. GRB 981226 optical observations
  28. GRB981220 B, R and I band observations
  29. Optical Observations of GRB981226
  30. GRB 981220:Optical Observations
  31. GRB 981226 optical observations
  32. GRB 981220
  33. GRB 981220, radio observations
  34. GRB981220 I-band Observations
  35. GRB 981220
  36. GRB 980326/Host Galaxy
  37. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  38. BeppoSAX NFI Observation of GRB980425
  39. GRB980329 R,I flux calibration and R,I,K upper limits
  40. GRB980425 Optical Follow-up
  41. GRB 980923 BATSE Observations
  42. SGR1900+14, BeppoSAX-GRBM observations
  43. GRB970508 optical observations
  44. GRB971214, association with a Galactic star?
  45. GRB980519, Optical Observations
  46. GRB980703 - BeppoSAX/GRBM detection
  47. GRB980703 optical photometry
  48. GRB 980703: BATSE Observations
  49. GRB980703 optical observations
  50. GRB980703: Radio transient
  51. GRB 980703: Spectrum of the proposed optical counterpart
  52. GRB980703 Transient Optical Follow-Up
  53. GRB980703: LOTIS observation at early times
  54. GRB980613 Optical Observations
  55. GRB980703 (I band observations)
  56. BeppoSAX NFI observations of GRB 980703
  57. GRB980519 observation report
  58. GRB980703 optical followup
  59. Radio observations of SGRs
  60. SGR1900+14 field optical observations
  61. GRB980613, optical observations
  62. GRB 980613: Optical transient and its host galaxy
  63. SGR1627-41, RXTE/ASM observations
  64. GRB 980613: Detection of the probable host galaxy
  65. Reduced error box of SGR 1627-41
  66. GRB 980613: BATSE Observations
  67. GRB 980613 Optical Observations
  68. GRB 980613 optical observations
  69. Discovery of a new SGR source, SGR1627-41
  70. GRB980613 Optical Observations
  71. GRB980613 observations from Palomar
  72. GRB 980613 optical/IR obs.
  73. GRB980613 Near Infra-Red Observations
  74. GRB971214 Secondary Standards
  75. GRB980519 Secondary Standards
  76. BATSE on-board GRB trigger change
  77. GRB 980519 Optical Observations
  78. GRB 980519
  79. GRB980519 optical observations
  80. GRB 980519 Optical Observations
  81. GRB980519 BATSE Observations
  82. GRB980519 Optical Observations
  83. GRB980519 Optical Observations
  84. GRB 980519 Optical Observations
  85. GRB980515, BeppoSAX IAUC to be submitted
  86. BSAX Observations of GRB980425 field
  87. IPN web site of GRBs
  88. GRB980425 BATSE observations
  89. SAX J0840.7+2248 Optical Observations
  90. GRB980425: optical obs.
  91. GRB980425: Radio Observations
  92. report on BSAX observations of GRB980425
  93. GRB 980329 ROSAT observation
  94. GRB980326 X-ray Observations
  95. GRB980326, optical observations
  96. GRB980326, optical observations
  97. GRB980329, Fading IR counterpart to radio source
  98. GRB980329 Keck K-band observations
  99. GRB980329 sub-millimeter observations
  100. GRB980329 optical observations

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