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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"

45426 results found.

  1. GRB030329, optical observation
  2. IPN triangulation of GRB030421 (annulus)
  3. MASTER:optical observations GRB030418
  4. MASTER:optical observations probable GRB030414
  5. GRB030329: 444 AAVSO Measurements
  6. IPN triangulation of GRB030419 (annulus)
  7. MASTER:optical observations GRB030416
  8. ROTSE-III prompt optical detections of GRB 030418
  9. GRB030418: Upper limits from recent and historical observations.
  10. GRB030418: Kiso near infrared observations
  11. GRB 030418: Optical afterglow
  12. GRB 030418: Optical afterglow candidate
  13. GRB 030329 OT position
  14. GRB030329: Optical Observations
  15. OT GRB 030329: early UBVRcIc spectral evolution
  16. GRB030329, UBVRI polarimetry, R-polarization
  17. GRB 030329: SARA Optical Observations
  18. OT GRB 030329: early spectrum
  19. GRB030329: VR Photometry at TNG
  20. GRB030324: Candidate Optical Afterglow (Erratum)
  21. GRB030324: Candidate Optical Afterglow
  22. IPN triangulation of GRB030414 (small error box)
  23. GRB 030413: Optical Observations
  24. GRB 030329 Rc observations
  25. IPN triangulation of GRB030413 (small error box)
  26. IPN triangulation of GRB030410 (annulus)
  27. Superluminal motion in GRB 030329 (Correction)
  28. Superluminal motion in GRB 030329
  29. GRB 030329 and SN 2003dh
  30. GRB030329, optical position
  31. GRB 030329 VLBA Observations
  32. CORRECTION TO IPN TRIANGULATION OF GRB050403
  33. IPN triangulation of GRB030406 (small error box)
  34. IPN triangulation of GRB050403 (small error box)
  35. IPN triangulation of GRB030403 (annulus)
  36. GRB 030329: BVRI photometry at Asiago
  37. GRB 030329, light curve flattens
  38. GRB 030329: VLT V-band photometry
  39. GRB 030329: Supernova Confirmed
  40. GRB030329: RTT150 optical observations
  41. GRB030329: Near Infrared Observations at Gunma
  42. GRB030329: HET spectroscopic monitoring
  43. Kiso observation of the GRB030329 at April 6
  44. GRB 030329, color evolution
  45. GRB030328, UBVRcIc field photometry
  46. GRB030329: Optical observcations
  47. GRB030329: BV photographic observations
  48. GRB 030329 Optical observations
  49. GRB 030329, color evolution
  50. GRB 030329: possible color change
  51. GRB030329: RTT150 optical observations
  52. GRB 030329: Supernova Spectrum Emerging
  53. GRB030329: Kiso B and R band observations
  54. GRB030329: RTT150 optical observation
  55. GRB030329: More AAVSO VR obs
  56. GRB030328: R upper limit after 6 hours by MASTER
  57. GRB 030329: BV photographic observations
  58. GRB 030329: SARA Optical Observations
  59. GRB 030329: SARA Optical Observations
  60. GRB030329, fading resumes
  61. GRB 030329, BVRI photometry
  62. GRB030329: Optical observations
  63. SDSS 0.5m PT observations of GRB030329 (correction)
  64. SDSS 0.5m PT observations of GRB030329
  65. GRB 030329, Optical observations
  66. GRB 030329, nearby galaxies
  67. GRB030329, cessation of fading
  68. GRB030329: final R-band light curve by MASTER
  69. GRB030329 - more 15 GHz radio data
  70. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  71. GRB 030329: Sub-millimeter detection
  72. GRB 030329: SARA Optical Observations
  73. GRB 030329: SARA Optical Observations
  74. OT GRB light curves and SN predictions
  75. GRB030329, optical observation
  76. GRB030329, optical observation
  77. GRB030329, new UBVRcIc field photometry
  78. GRB 030329, light curve and SN prediction
  79. GRB030329: optical observations at Tokyo Tech
  80. GRB 030329: optical observations
  81. GRB030329: multiple re-brightening phases
  82. GRB 030329, BRI photometry
  83. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  84. GRB 030329 , SPM optical observations
  85. GRB030329: Optical observations at Teramo
  86. GRB 030329: Radio observations at GMRT
  87. Further AAVSO V,B,R observations of GRB030329
  88. GRB 030329: Additional Mt. Laguna Optical Observations
  89. GRB 030329: SARA Optical Observations
  90. GRB 030329: Observations with ANDICAM
  91. GRB030329: Optical observations
  92. GRB030329: further optical photometry and evidence for a light curve discontinuity
  93. GRB 030329: Correction to GCN 2056
  94. GRB 030329: fitting parameters and re-brightening
  95. GRB 030329: KAIT optical photometry
  96. GRB030329 Further RBO Optical Observations
  97. triangulation of GRB 030331 (single error box)
  98. GRB030329 - OT rebrightens
  99. GRB 030329: SARA Optical Observations
  100. AAVSO V & R observations of GRB030329

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