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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"

37554 results found.

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