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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"

35957 results found.

  1. IPN triangulation of GRB030426 (annulus)
  2. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  3. IPN triangulation of GRB030425 (single error box)
  4. GRB 030329, the review of the sky area in plate archive (1950-1998)
  5. GRB 030329: Spectral Evolution of SN 2003dh
  6. Optical Observations of GRB 030418 with Magellan
  7. GRB 030329: optical spectropolarimetry at VLT
  8. IPN triangulation of GRB030422C (annulus)
  9. IPN triangulation of GRB030422B (annulus)
  10. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  11. GRB030329: optical polarization
  12. IPN triangulation of GRB030422 (two large error boxes)
  13. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  14. IPN triangulation of GRB030421 (annulus)
  15. MASTER:optical observations GRB030418
  16. MASTER:optical observations probable GRB030414
  17. GRB030329: 444 AAVSO Measurements
  18. IPN triangulation of GRB030419 (annulus)
  19. MASTER:optical observations GRB030416
  20. ROTSE-III prompt optical detections of GRB 030418
  21. GRB030418: Upper limits from recent and historical observations.
  22. GRB030418: Kiso near infrared observations
  23. GRB 030418: Optical afterglow
  24. GRB 030418: Finder for afterglow candidate
  25. GRB 030418: Optical afterglow candidate
  26. GRB 030329 OT position
  27. OT GRB 030329: early UBVRcIc spectral evolution
  28. GRB030329, UBVRI polarimetry, R-polarization
  29. GRB 030329: SARA Optical Observations
  30. OT GRB 030329: early spectrum
  31. GRB030329: VR Photometry at TNG
  32. GRB030324: Candidate Optical Afterglow (Erratum)
  33. GRB030324: Candidate Optical Afterglow
  34. IPN triangulation of GRB030414 (small error box)
  35. GRB 030413: Optical Observations
  36. GRB 030329 Rc observations
  37. IPN triangulation of GRB030413 (small error box)
  38. IPN triangulation of GRB030410 (annulus)
  39. Superluminal motion in GRB 030329 (Correction)
  40. Superluminal motion in GRB 030329
  41. GRB 030329 and SN 2003dh
  42. GRB030329, optical position
  43. GRB 030329 VLBA Observations
  44. IPN triangulation of GRB030406 (small error box)
  45. IPN triangulation of GRB050403 (small error box)
  46. IPN triangulation of GRB030403 (annulus)
  47. GRB 030329: BVRI photometry at Asiago
  48. GRB 030329, light curve flattens
  49. GRB 030329: VLT V-band photometry
  50. If the SN/GRB connection confirmed
  51. GRB 030329: Supernova Confirmed
  52. GRB030329: RTT150 optical observations
  53. GRB030329: Near Infrared Observations at Gunma
  54. GRB030329: HET spectroscopic monitoring
  55. Kiso observation of the GRB030329 at April 6
  56. GRB 030329, color evolution
  57. GRB030328, UBVRcIc field photometry
  58. GRB 030329 Optical observations
  59. GRB 030329, color evolution
  60. GRB 030329: possible color change
  61. GRB030329: RTT150 optical observations
  62. GRB 030329: Supernova Spectrum Emerging
  63. GRB030329: Kiso B and R band observations
  64. GRB030329: RTT150 optical observation
  65. GRB030329: More AAVSO VR obs
  66. GRB030328: R upper limit after 6 hours by MASTER
  67. GRB 030329: BV photographic observations
  68. GRB 030329: SARA Optical Observations
  69. GRB 030329: SARA Optical Observations
  70. GRB030329, fading resumes
  71. GRB 030329, BVRI photometry
  72. SDSS 0.5m PT observations of GRB030329 (correction)
  73. SDSS 0.5m PT observations of GRB030329
  74. GRB 030329, Optical observations
  75. GRB 030329, nearby galaxies
  76. GRB030329, cessation of fading
  77. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  78. GRB 030329: Sub-millimeter detection
  79. GRB 030329: SARA Optical Observations
  80. GRB 030329: SARA Optical Observations
  81. OT GRB light curves and SN predictions
  82. GRB030329, optical observation
  83. GRB030329, new UBVRcIc field photometry
  84. GRB 030329, light curve and SN prediction
  85. GRB030329: optical observations at Tokyo Tech
  86. GRB 030329: optical observations
  87. GRB030329: multiple re-brightening phases
  88. GRB 030329, BRI photometry
  89. GRB 030329 , SPM optical observations
  90. GRB 030329: Radio observations at GMRT
  91. Further AAVSO V,B,R observations of GRB030329
  92. GRB 030329: Additional Mt. Laguna Optical Observations
  93. GRB 030329: SARA Optical Observations
  94. GRB 030329: Observations with ANDICAM
  95. GRB030329: further optical photometry and evidence for a light curve discontinuity
  96. GRB 030329: Correction to GCN 2056
  97. GRB 030329: fitting parameters and re-brightening
  98. GRB 030329: KAIT optical photometry
  99. GRB030329 Further RBO Optical Observations
  100. triangulation of GRB 030331 (single error box)

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