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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"

36155 results found.

  1. GRB 030329: optical spectropolarimetry at VLT
  2. IPN triangulation of GRB030422C (annulus)
  3. IPN triangulation of GRB030422B (annulus)
  4. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  5. GRB030329: optical polarization
  6. IPN triangulation of GRB030422 (two large error boxes)
  7. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  8. IPN triangulation of GRB030421 (annulus)
  9. MASTER:optical observations GRB030418
  10. MASTER:optical observations probable GRB030414
  11. GRB030329: 444 AAVSO Measurements
  12. IPN triangulation of GRB030419 (annulus)
  13. MASTER:optical observations GRB030416
  14. ROTSE-III prompt optical detections of GRB 030418
  15. GRB030418: Upper limits from recent and historical observations.
  16. GRB030418: Kiso near infrared observations
  17. GRB 030418: Optical afterglow
  18. GRB 030418: Finder for afterglow candidate
  19. GRB 030418: Optical afterglow candidate
  20. GRB 030329 OT position
  21. OT GRB 030329: early UBVRcIc spectral evolution
  22. GRB030329, UBVRI polarimetry, R-polarization
  23. GRB 030329: SARA Optical Observations
  24. OT GRB 030329: early spectrum
  25. GRB030329: VR Photometry at TNG
  26. GRB030324: Candidate Optical Afterglow (Erratum)
  27. GRB030324: Candidate Optical Afterglow
  28. IPN triangulation of GRB030414 (small error box)
  29. GRB 030413: Optical Observations
  30. GRB 030329 Rc observations
  31. IPN triangulation of GRB030413 (small error box)
  32. IPN triangulation of GRB030410 (annulus)
  33. Superluminal motion in GRB 030329 (Correction)
  34. Superluminal motion in GRB 030329
  35. GRB 030329 and SN 2003dh
  36. GRB030329, optical position
  37. GRB 030329 VLBA Observations
  38. IPN triangulation of GRB030406 (small error box)
  39. IPN triangulation of GRB050403 (small error box)
  40. IPN triangulation of GRB030403 (annulus)
  41. GRB 030329: BVRI photometry at Asiago
  42. GRB 030329, light curve flattens
  43. GRB 030329: VLT V-band photometry
  44. If the SN/GRB connection confirmed
  45. GRB 030329: Supernova Confirmed
  46. GRB030329: RTT150 optical observations
  47. GRB030329: Near Infrared Observations at Gunma
  48. GRB030329: HET spectroscopic monitoring
  49. Kiso observation of the GRB030329 at April 6
  50. GRB 030329, color evolution
  51. GRB030328, UBVRcIc field photometry
  52. GRB 030329 Optical observations
  53. GRB 030329, color evolution
  54. GRB 030329: possible color change
  55. GRB030329: RTT150 optical observations
  56. GRB 030329: Supernova Spectrum Emerging
  57. GRB030329: Kiso B and R band observations
  58. GRB030329: RTT150 optical observation
  59. GRB030329: More AAVSO VR obs
  60. GRB030328: R upper limit after 6 hours by MASTER
  61. GRB 030329: BV photographic observations
  62. GRB 030329: SARA Optical Observations
  63. GRB 030329: SARA Optical Observations
  64. GRB030329, fading resumes
  65. GRB 030329, BVRI photometry
  66. SDSS 0.5m PT observations of GRB030329 (correction)
  67. SDSS 0.5m PT observations of GRB030329
  68. GRB 030329, Optical observations
  69. GRB 030329, nearby galaxies
  70. GRB030329, cessation of fading
  71. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  72. GRB 030329: Sub-millimeter detection
  73. GRB 030329: SARA Optical Observations
  74. GRB 030329: SARA Optical Observations
  75. OT GRB light curves and SN predictions
  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. GRB 030329 , SPM optical observations
  84. GRB 030329: Radio observations at GMRT
  85. Further AAVSO V,B,R observations of GRB030329
  86. GRB 030329: Additional Mt. Laguna Optical Observations
  87. GRB 030329: SARA Optical Observations
  88. GRB 030329: Observations with ANDICAM
  89. GRB030329: further optical photometry and evidence for a light curve discontinuity
  90. GRB 030329: Correction to GCN 2056
  91. GRB 030329: fitting parameters and re-brightening
  92. GRB 030329: KAIT optical photometry
  93. GRB030329 Further RBO Optical Observations
  94. triangulation of GRB 030331 (single error box)
  95. GRB030329 - OT rebrightens
  96. GRB 030329: SARA Optical Observations
  97. AAVSO V & R observations of GRB030329
  98. IPN triangulation of GRB030331 (annulus)
  99. GRB 030329: optical observations
  100. IPN triangulation of GRB030329b (large error box)

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