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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"
  1. GRB 030429: IR photometry with IRSF/SIRIUS
  2. GRB030501B triangulation (single error box)
  3. GRB 030329 Optical Observations
  4. GRB030328, optical observation
  5. GRB 030329, BVRI photometry
  6. GRB030429: Optical Observations
  7. GRB030501: TAROT candidate afterglow present in archival images
  8. GRB 030501: TAROT possible candidate counterpart
  9. IPN triangulation of GRB030501 (IBIS event; annulus)
  10. IPN triangulation of GRB030501B (annulus)
  11. GRB 030429: confirmation of afterglow candidate
  12. GRB030429, possible optical counterpart
  13. GRB030501 localized by INTEGRAL
  14. GRB030425: CrAO optical observation
  15. IPN triangulation of GRB030429 (annulus)
  16. IPN triangulation of GRB030428 (two large error boxes)
  17. GRB 030329 Oprical observations in Rozhen observatory
  18. GRB 030429: ROTSE-III observations
  19. GRB 030324: Radio Observations
  20. GRB030329 observed as a sudden ionospheric disturbance (SID)
  21. IPN triangulation of GRB030426 (annulus)
  22. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  23. IPN triangulation of GRB030425 (single error box)
  24. GRB030329, SPM optical observations (Correction)
  25. GRB030329, SPM optical observations
  26. GRB 030329, the review of the sky area in plate archive (1950-1998)
  27. GRB 030329: Spectral Evolution of SN 2003dh
  28. Optical Observations of GRB 030418 with Magellan
  29. GRB 030329: optical spectropolarimetry at VLT
  30. IPN triangulation of GRB030422C (annulus)
  31. IPN triangulation of GRB030422B (annulus)
  32. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  33. GRB030329: optical polarization
  34. IPN triangulation of GRB030422 (two large error boxes)
  35. GRB 030329 3.5 and 6 cm radio observations at RTF-32 telescope
  36. GRB030329, optical observation
  37. IPN triangulation of GRB030421 (annulus)
  38. MASTER:optical observations GRB030418
  39. MASTER:optical observations probable GRB030414
  40. GRB030329: 444 AAVSO Measurements
  41. IPN triangulation of GRB030419 (annulus)
  42. MASTER:optical observations GRB030416
  43. ROTSE-III prompt optical detections of GRB 030418
  44. GRB030418: Upper limits from recent and historical observations.
  45. GRB030418: Kiso near infrared observations
  46. GRB 030418: Optical afterglow
  47. GRB 030418: Finder for afterglow candidate
  48. GRB 030418: Optical afterglow candidate
  49. GRB 030329 OT position
  50. GRB030329: Optical Observations
  51. OT GRB 030329: early UBVRcIc spectral evolution
  52. GRB030329, UBVRI polarimetry, R-polarization
  53. GRB 030329: SARA Optical Observations
  54. OT GRB 030329: early spectrum
  55. GRB030329: VR Photometry at TNG
  56. GRB030324: Candidate Optical Afterglow (Erratum)
  57. GRB030324: Candidate Optical Afterglow
  58. IPN triangulation of GRB030414 (small error box)
  59. GRB 030413: Optical Observations
  60. GRB 030329 Rc observations
  61. IPN triangulation of GRB030413 (small error box)
  62. IPN triangulation of GRB030410 (annulus)
  63. Superluminal motion in GRB 030329 (Correction)
  64. Superluminal motion in GRB 030329
  65. GRB 030329 and SN 2003dh
  66. GRB030329, optical position
  67. GRB 030329 VLBA Observations
  68. CORRECTION TO IPN TRIANGULATION OF GRB050403
  69. IPN triangulation of GRB030406 (small error box)
  70. IPN triangulation of GRB050403 (small error box)
  71. IPN triangulation of GRB030403 (annulus)
  72. GRB 030329: BVRI photometry at Asiago
  73. GRB 030329, light curve flattens
  74. GRB 030329: VLT V-band photometry
  75. If the SN/GRB connection confirmed
  76. GRB 030329: Supernova Confirmed
  77. GRB030329: RTT150 optical observations
  78. GRB030329: Near Infrared Observations at Gunma
  79. GRB030329: HET spectroscopic monitoring
  80. Kiso observation of the GRB030329 at April 6
  81. GRB 030329, color evolution
  82. GRB030328, UBVRcIc field photometry
  83. GRB030329: Optical observcations
  84. GRB030329: BV photographic observations
  85. GRB 030329 Optical observations
  86. GRB 030329, color evolution
  87. GRB 030329: possible color change
  88. GRB030329: RTT150 optical observations
  89. GRB 030329: Supernova Spectrum Emerging
  90. GRB030329: Kiso B and R band observations
  91. GRB030329: RTT150 optical observation
  92. GRB030329: More AAVSO VR obs
  93. GRB030328: R upper limit after 6 hours by MASTER
  94. GRB 030329: BV photographic observations
  95. GRB 030329: SARA Optical Observations
  96. GRB 030329: SARA Optical Observations
  97. GRB030329, fading resumes
  98. GRB 030329, BVRI photometry
  99. GRB030329: Optical observations
  100. SDSS 0.5m PT observations of GRB030329 (correction)

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