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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"

37579 results found.

  1. GRB030501, optical observation
  2. GRB030501C triangulation (annulus)
  3. GRB030329: RTT150 optical observations and upper limit for a host
  4. GRB 030429: Radio Observations
  5. GRB 030429: redshift from VLT spectroscopy
  6. GRB 030429: IR photometry with IRSF/SIRIUS
  7. GRB030501B triangulation (single error box)
  8. GRB 030329 Optical Observations
  9. GRB 030329, BVRI photometry
  10. GRB 030501: TAROT possible candidate counterpart
  11. IPN triangulation of GRB030501 (IBIS event; annulus)
  12. IPN triangulation of GRB030501B (annulus)
  13. GRB 030429: confirmation of afterglow candidate
  14. GRB030429, possible optical counterpart
  15. GRB030501 localized by INTEGRAL
  16. GRB030425: CrAO optical observation
  17. IPN triangulation of GRB030429 (annulus)
  18. IPN triangulation of GRB030428 (two large error boxes)
  19. GRB 030329 Oprical observations in Rozhen observatory
  20. GRB 030429: ROTSE-III observations
  21. GRB 030324: Radio Observations
  22. GRB030329 observed as a sudden ionospheric disturbance (SID)
  23. IPN triangulation of GRB030426 (annulus)
  24. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  25. IPN triangulation of GRB030425 (single error box)
  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. IPN triangulation of GRB030421 (annulus)
  37. MASTER:optical observations GRB030418
  38. MASTER:optical observations probable GRB030414
  39. GRB030329: 444 AAVSO Measurements
  40. IPN triangulation of GRB030419 (annulus)
  41. MASTER:optical observations GRB030416
  42. ROTSE-III prompt optical detections of GRB 030418
  43. GRB030418: Upper limits from recent and historical observations.
  44. GRB030418: Kiso near infrared observations
  45. GRB 030418: Optical afterglow
  46. GRB 030418: Finder for afterglow candidate
  47. GRB 030418: Optical afterglow candidate
  48. GRB 030329 OT position
  49. OT GRB 030329: early UBVRcIc spectral evolution
  50. GRB030329, UBVRI polarimetry, R-polarization
  51. GRB 030329: SARA Optical Observations
  52. OT GRB 030329: early spectrum
  53. GRB030329: VR Photometry at TNG
  54. GRB030324: Candidate Optical Afterglow (Erratum)
  55. GRB030324: Candidate Optical Afterglow
  56. IPN triangulation of GRB030414 (small error box)
  57. GRB 030413: Optical Observations
  58. GRB 030329 Rc observations
  59. IPN triangulation of GRB030413 (small error box)
  60. IPN triangulation of GRB030410 (annulus)
  61. Superluminal motion in GRB 030329 (Correction)
  62. Superluminal motion in GRB 030329
  63. GRB 030329 and SN 2003dh
  64. GRB030329, optical position
  65. GRB 030329 VLBA Observations
  66. IPN triangulation of GRB030406 (small error box)
  67. IPN triangulation of GRB050403 (small error box)
  68. IPN triangulation of GRB030403 (annulus)
  69. GRB 030329: BVRI photometry at Asiago
  70. GRB 030329, light curve flattens
  71. GRB 030329: VLT V-band photometry
  72. If the SN/GRB connection confirmed
  73. GRB 030329: Supernova Confirmed
  74. GRB030329: RTT150 optical observations
  75. GRB030329: Near Infrared Observations at Gunma
  76. GRB030329: HET spectroscopic monitoring
  77. Kiso observation of the GRB030329 at April 6
  78. GRB 030329, color evolution
  79. GRB030328, UBVRcIc field photometry
  80. GRB 030329 Optical observations
  81. GRB 030329, color evolution
  82. GRB 030329: possible color change
  83. GRB030329: RTT150 optical observations
  84. GRB 030329: Supernova Spectrum Emerging
  85. GRB030329: Kiso B and R band observations
  86. GRB030329: RTT150 optical observation
  87. GRB030329: More AAVSO VR obs
  88. GRB030328: R upper limit after 6 hours by MASTER
  89. GRB 030329: BV photographic observations
  90. GRB 030329: SARA Optical Observations
  91. GRB 030329: SARA Optical Observations
  92. GRB030329, fading resumes
  93. GRB 030329, BVRI photometry
  94. SDSS 0.5m PT observations of GRB030329 (correction)
  95. SDSS 0.5m PT observations of GRB030329
  96. GRB 030329, Optical observations
  97. GRB 030329, nearby galaxies
  98. GRB030329, cessation of fading
  99. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  100. GRB 030329: Sub-millimeter detection

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