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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"

24289 results found.

  1. GRB 990308a and GRB 990308b
  2. GRB990308 (Trig. 7457), optical observations
  3. GRB990308, Possible new SGR~0209+70
  4. GRB981220, IPN localization
  5. GRB 990217, radio observations
  6. BATSE Resumes Normal Operations
  7. GRB990123 observations
  8. GRB990217 Optical observation
  9. GRB990123, Optical observation
  10. GRB 990123: Publicly available reduced HST images
  11. GRB990123, Upcoming HST Service Observations
  12. GRB990123 Optical Observations
  13. GRB990123, Probability of gravitational lensing
  14. GRB 990123: Continued Radio Observations
  15. GRB990123, Preliminary Lens Search Results
  16. GRB 990123: Correction to GCN 230 - C.A. Young added to author list
  17. On the Lensing Interpretation of GRB 990123
  18. Search for Potential Images of GRB 990123
  19. GRB990123, Optical BVRI Observations
  20. GRB 990123: near-infrared observations.
  21. GRB990123, OSSE observations
  22. GRB 990123 : Multiple and Distorted Images of the Host Galaxy?
  23. GRB 990123 Spectroscopic Redshifts
  24. GRB 990123 optical observations
  25. GRB990123 optical observations
  26. GRB990123, Optical observation
  27. GRB 990123: Optical Decay Slope
  28. GRB990123, early optical counterpart detection
  29. GRB990123 Optical Observation
  30. GRB 990123: Bright New Source, Possible Optical Transient
  31. Possible identification of SN1999E with GRB980910
  32. Optical Observations of GRB 981220
  33. GRB981220
  34. GRB981220, Correction to GCN 179
  35. GRB 981220 Optical observations
  36. GRB 981226
  37. GRB 981220
  38. GRB 981220, radio observations
  39. GRB981226 Optical Observation
  40. GRB 981220: BeppoSAX/GRBM results
  41. GRB981220 I-band Observations
  42. GRB981220 Optical Observations
  43. GRB 981220
  44. GRB 980326/Host Galaxy
  45. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  46. GRB 980923 BATSE Observations
  47. GRB970508 optical observations
  48. Optical Observations of the Host Galaxy of GRB 980519
  49. GRB980519, Optical Observations
  50. GRB980703 H-band Observations
  51. GRB980703: LOTIS observation at early times
  52. GRB 980703: ASM Position & Intensity
  53. GRB980519 observation report
  54. GRB980703 optical followup
  55. GRB980613, optical observations
  56. GRB 980613: BATSE Observations
  57. Discovery of a new SGR source, SGR1627-41
  58. GRB 980519 Optical Observations
  59. GRB 980519 Optical Observations
  60. GRB970519, optical follow-up at Schmidt Calern
  61. GRB980519 optical observations
  62. GRB980519 Optical Observations
  63. GRB980515, BeppoSAX IAUC to be submitted
  64. GRB980519, BeppoSAX-WFC updated position
  65. GRB 980425 Radio Light Curve
  66. GRB 980425 Brightness Temperature
  67. GRB 980329 ROSAT observation
  68. GRB980326, optical observations
  69. GRB980326, optical observations
  70. GRByymmdd, Announcement of automation
  71. GRB980329 sub-millimeter observations
  72. GRB980329 optical observations
  73. GRB980329 optical observations
  74. GRB980326 optical observations
  75. GRB980326 optical observations
  76. Optical Observations of GRB 970508
  77. GRB 971214: Redshift from Keck Observations
  78. Near-IR follow-up on GRB 971227
  79. Optical Observations of the GRB 971227 field
  80. Optical Observations on GRB 971227
  81. GRB 971214: Redshift from Keck Optical Observations
  82. GRB 971214: Redshift from Keck Optical Observations
  83. Optical Observations of GRB 971214 at Keck
  84. GRB 971214: USNOFS Observations Summary
  85. GRB 971024: Refined analysis by USNOFS Observations
  86. GRB 971024: USNO Observations
  87. GRB 970925: BATSE Localization
  88. IRAS 18119-1342 and the possible new SGR
  89. GRB 970828: Palomar Observations

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