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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"

28033 results found.

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

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