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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"

23608 results found.

  1. GRB 021004: Additional V-band Polarimetric Observations
  2. GRB021004: optical observation
  3. GRB 021004: WC wind?
  4. GRB021004: NIR and Optical observations
  5. GRB 021004: Optical measurement at OHP
  6. GRB 021004: Optical observations, AUDE network
  7. GRB 021004: optical spectroscopy
  8. IPN triangulation of GRB021007 (annulus)
  9. XRF 020903 spectrum
  10. GRB 021004: HST/STIS spectroscopic observations
  11. GRB021004: optical observations and predicted break time
  12. GRB021004: BVRc photometry
  13. GRB 021004 redshift
  14. GRB021004: restart of optical decay
  15. GRB 021004 continued IR fading
  16. HETE fluences for GRB021004
  17. GRB021004: not fading anymore?
  18. GRB 021004: Optical Photometry at 2.5 Days
  19. GRB 021004: V-band Polarimetric Observations
  20. GRB 021004: Optical Decay
  21. GRB 021004: Optical observations at RIKEN
  22. GRB 021004: Optical Observations
  23. GRB021004: continued fading
  24. GRB 021004: Optical Photometry at 1.5 Days
  25. GRB021004, Optical Observations
  26. GRB021004, BVRcIc field photometry
  27. GRB 021004: Optical observations
  28. GRB 021004: optical counterpart
  29. GRB021004: Optical Spectroscopy
  30. GRB 021004: steepening of the optical decay slope
  31. GRB021004: Upper limits from recent and historical observations
  32. XRF020903, BVRI field photometry
  33. GRB021004: optical observations at Nyrola
  34. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  35. GRB021004: optical observations at Bisei
  36. GRB 021004: Kyoto observation
  37. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  38. XRF020903: TNG and Asiago photometry
  39. GRB 020903: Optical observations at RIKEN
  40. XRF 020903: Correction to GCN 1560
  41. XRF 020903: VRI observations
  42. IPN triangulation of GRB020926 (single large error box)
  43. GRB 020903: correction to GCN 1557
  44. XRF 020903: R band observations
  45. XRF 020903: Supernova
  46. IPN triangulation of GRB020926 (two large error boxes)
  47. IPN triangulation of GRB020923 (two error boxes)
  48. IPN annulus for GRB020923
  49. IPN triangulation of GRB020914B
  50. IPN triangulation of GRB020911 (2 large error boxes)
  51. Confirmation of IPN error box for GRB020910
  52. IPN triangulation of GRB020910
  53. Single IPN error box for GRB020904
  54. XRF 020903: optical observation at Kyoto
  55. XRF 020903: Optical observations
  56. IPN triangulation of GRB020904
  57. IPN detection of a burst from SGR1900+14
  58. XRF 020903, optical observations
  59. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  60. INTEGRAL GRBs added to GCN
  61. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  62. SGR1900+14 burst localized by HETE
  63. GRB020813: High-resolution optical spectroscopy
  64. GRB020819: optical observations at Bisei
  65. GRB 020812: optical observation at Kyoto University
  66. Second epoch K band imaging of GRB 020819
  67. K band observation of GRB 020819
  68. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  69. IPN triangulation of GRB020819 (HETE 2275)
  70. GRB020813: optical and NIR observations
  71. GRB020813: Fading X-ray Afterglow Observed with Chandra
  72. GRB020813, UBVRI field calibration
  73. GRB 020813: addendum to GCN 1498
  74. GRB020813: optical observations at Bisei
  75. GRB020813: V-band decay slope
  76. Polarimetry of GRB020813: evidence for variability
  77. GRB020813 IRAM millimeter observations
  78. GRB020813(=H2262): Revised Localization with HETE SXC
  79. GRB 020812: optical observation at Bisei
  80. GRB020813: optical observations; possible host galaxy
  81. GRB 020812 : optical afterglow candidate
  82. GRB 020813 : KISO multiband optical observations
  83. GRB020813, optical observations
  84. IPN error box for GRB020813
  85. IPN triangulation of GRB020813
  86. GRB020812: possible afterglow candidate
  87. GRB020812: possible afterglow candidate
  88. Spectropolarimetry of GRB 020813
  89. GRB 020813 Afterglow Observations; Possible break
  90. GRB020813: optical afterglow
  91. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  92. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  93. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  94. Further refinement to IPN error box for GRB020531
  95. GRB020331: Late-time Optical Light Curve (re-submission)
  96. GRB020331: Late-time Optical Light Curve
  97. IPN triangulation of GRB020714
  98. IPN triangulation of GRB020715 (=GRB150702)
  99. IPN triangulation of GRB020714
  100. IPN triangulation of GRB150702

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