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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"

37955 results found.

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

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