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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"

27392 results found.

  1. GRB021004, late time optical observations
  2. GRB021004 Chandra Observation
  3. IPN detection of continued SGR1900+14 activity
  4. Improved IPN error box for GRB021125
  5. IPN BURST POSITION
  6. IPN triangulation of GRB021125 (INTEGRAL BURST)
  7. GRB021125 : A long GRB localized by INTEGRAL
  8. IPN confirmation of the reactivation of SGR1900+14
  9. GRB021113, SPI ACS observation
  10. GRB 021112: Afterglow or Variable Star?
  11. GRB021113: optical observations at Bisei
  12. GRB 021113: Evidence for a Dark Optical Afterglow
  13. GRB021112, BVRI field photometry
  14. GRB 021112: Variable Source in R-band search
  15. GRB021112: Optical Observations
  16. IPN triangulation of GRB021113 (=H2449; annulus)
  17. GRB 021113: Optical observations
  18. GRB 021112: RAPTOR Observations
  19. GRB021113 (=H2449): A Long GRB Localized by HETE
  20. GRB021112 (=H2448): A Long GRB Localized by HETE
  21. GRB 021016: Optical Observations
  22. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  23. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  24. SGR1900+14 activity, November 2-4, 2002
  25. GRB021104: optical observations
  26. Detection of activity from SGR 1900+14 with the RXTE/PCA
  27. IPN triangulation of GRB021027 (single large error box)
  28. IPN triangulation of GRB021027 (two large error boxes)
  29. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  30. GRB 021004: optical observations
  31. IPN triangulation of GRB021023 (small error boc)
  32. GRB 020813; likely host galaxy.
  33. IPN triangulation of GRB021020 (smaller error box)
  34. IPN triangulation of GRB021020
  35. GRB 021008, optical observations
  36. IPN triangulation of GRB021016 (small error box)
  37. IPN triangulation of GRB021014 (large error box)
  38. IPN triangulation of GRB021013 (single error box)
  39. GRB 021004: optical spectroscopy on Oct 11
  40. IPN triangulation of GRB021013 (two small error boxes)
  41. GRB021004: High-resolution optical spectroscopy
  42. XRF 020903: flattening of the optical light curve.
  43. GRB021004, UBVRcIc field photometry update
  44. IPN triangulation of GRB021008 (single error box)
  45. GRB 021004 submm observations
  46. IPN triangulation of GRB021008 (two small error boxes)
  47. GRB021004 Chandra HETG Observations
  48. GRB 021004: Optical/NIR Observations
  49. GRB 021004: Additional V-band Polarimetric Observations
  50. GRB021004: optical observation
  51. GRB 021004: Host Galaxy Star Formation Rate
  52. GRB 021004 submm observations
  53. GRB 021004: WC wind?
  54. GRB021004: NIR and Optical observations
  55. GRB 021004: Optical observations, AUDE network
  56. GRB 021004 - VLA Radio Observations
  57. GRB 021004 - Unusual Radio-to-Submm Spectrum
  58. GRB 021004: optical spectroscopy
  59. IPN triangulation of GRB021007 (annulus)
  60. GRB021004: optical observations and predicted break time
  61. GRB021004: BVRc photometry
  62. GRB021004 radio observation
  63. HETE fluences for GRB021004
  64. GRB 021004: Optical Photometry at 2.5 Days
  65. GRB 021004: polarimetric observations
  66. GRB 021004: V-band Polarimetric Observations
  67. GRB021004: Update Bisei photometric data
  68. IRAM Millimeter detection of GRB 021004
  69. GRB 021004 radio observation
  70. GRB 021004: Optical Photometry at 1.5 Days
  71. GRB021004, BVRcIc field photometry
  72. GRB021004: Optical Spectroscopy
  73. GRB 021004 radio search
  74. XRF020903, BVRI field photometry
  75. XRF020903: TNG and Asiago photometry
  76. GRB 020903: Optical observations at RIKEN
  77. XRF 020903: Correction to GCN 1560
  78. XRF 020903: VRI observations
  79. XRF 020903: R band observations
  80. XRF 020903: Archival Optical Images
  81. Radio Observations of XRF 020903: The Missing Link
  82. XRF 020903: Supernova
  83. IPN triangulation of GRB020923 (two error boxes)
  84. IPN triangulation of GRB020914B
  85. IPN triangulation of GRB020911 (2 large error boxes)
  86. GRB 020305: HST/STIS observations
  87. Confirmation of IPN error box for GRB020910
  88. IPN triangulation of GRB020910
  89. IPN GCN Circulars now to be issued without restriction
  90. Single IPN error box for GRB020904
  91. XRF 020903: optical observation at Kyoto
  92. GRB020322 : HST/STIS observations
  93. XRF 020903: Optical observations
  94. IPN triangulation of GRB020904
  95. INTEGRAL GRBs added to GCN
  96. SGR1900+14 burst localized by HETE
  97. GRB020813: High-resolution optical spectroscopy
  98. GRB020812: negative optical observations
  99. GRB 020812: optical observation at Kyoto University
  100. Second epoch K band imaging of GRB 020819

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