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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"

19093 results found.

  1. HETE 2493: Optical candidate
  2. GRB021201, BVRcIc field photometry
  3. GRB 021201: Optical Observations
  4. GRB 021201: BOOTES simultaneous optical observations
  5. IPN triangulation of GRB021201 (short/hard burst, small error box)
  6. GRB021004, late time optical observations
  7. IPN triangulation of GRB021119 (large error box)
  8. Improved IPN error box for GRB021125
  9. GRB021125 : A long GRB localized by INTEGRAL
  10. GRB 021112: Afterglow or Variable Star?
  11. GRB021113: optical observations at Bisei
  12. GRB021112, BVRI field photometry
  13. GRB 021112: Variable Source in R-band search
  14. GRB021112: Optical Observations
  15. GRB 021113: Optical observations
  16. GRB 021112: RAPTOR Observations
  17. GRB021113 (=H2449): A Long GRB Localized by HETE
  18. GRB021112 (=H2448): A Long GRB Localized by HETE
  19. GRB 021016: Optical Observations
  20. GRB021004: Near infrared spectroscopy
  21. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  22. SGR1900+14 activity, November 2-4, 2002
  23. GRB021104: optical observations
  24. Detection of activity from SGR 1900+14 with the RXTE/PCA
  25. IPN triangulation of GRB021027 (single large error box)
  26. GRB 021004: optical observations
  27. GRB021004: Optical Observations
  28. GRB021016(=H2397): A Long GRB Localized by HETE
  29. IPN triangulation of GRB021014 (large error box)
  30. IPN triangulation of GRB021013 (two small error boxes)
  31. XRF 020903: flattening of the optical light curve.
  32. GRB021004, UBVRcIc field photometry update
  33. IPN triangulation of GRB021008 (single error box)
  34. IPN triangulation of GRB021008 (two small error boxes)
  35. GRB021004 Chandra HETG Observations
  36. GRB 021004: Optical/NIR Observations
  37. GRB 021004: Additional V-band Polarimetric Observations
  38. GRB021004: optical observation
  39. GRB 021004: Host Galaxy Star Formation Rate
  40. GRB 021004: WC wind?
  41. GRB021004: NIR and Optical observations
  42. IPN triangulation of GRB021007 (annulus)
  43. XRF 020903 spectrum
  44. GRB021004: BVRc photometry
  45. GRB 021004 redshift
  46. GRB021004 radio observation
  47. HETE fluences for GRB021004
  48. GRB 021004: Optical Photometry at 2.5 Days
  49. GRB 021004: polarimetric observations
  50. GRB 021004: V-band Polarimetric Observations
  51. GRB021004: Update Bisei photometric data
  52. GRB 021004: Optical Decay
  53. GRB 021004 radio observation
  54. GRB 021004: Optical Photometry at 1.5 Days
  55. GRB021004, BVRcIc field photometry
  56. GRB021004: Optical Spectroscopy
  57. GRB 021004 radio search
  58. XRF020903, BVRI field photometry
  59. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  60. XRF020903: TNG and Asiago photometry
  61. XRF 020903: Correction to GCN 1560
  62. XRF 020903: VRI observations
  63. XRF 020903: R band observations
  64. IPN triangulation of GRB020923 (two error boxes)
  65. IPN triangulation of GRB020914 - clarification and additional information
  66. GRB 020305: HST/STIS observations
  67. XRF 020903: optical observation at Kyoto
  68. GRB020322 : HST/STIS observations
  69. XRF 020903: Optical observations
  70. IPN triangulation of GRB020904
  71. INTEGRAL GRBs added to GCN
  72. SGR1900+14 burst localized by HETE
  73. GRB020812: negative optical observations
  74. GRB 020812: optical observation at Kyoto University
  75. Second epoch K band imaging of GRB 020819
  76. GRB 020813 : HST observations
  77. GRB 020812: early time optical observation at Ouda Station
  78. GRB020813: Magellan BVRI Photometry
  79. GRB 020819: Optical observations
  80. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  81. GRB020813: optical and NIR observations
  82. GRB020813: Fading X-ray Afterglow Observed with Chandra
  83. GRB020813, UBVRI field calibration
  84. Polarimetry of GRB020813: evidence for variability
  85. GRB020812: optical observations
  86. GRB020813: High-Resolution Optical Observations
  87. GRB020812: optical observations
  88. GRB020813, optical observations
  89. GRB020813, astrometric position
  90. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  91. GRB 020812 optical observation
  92. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  93. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  94. HST Imaging of the Host of GRB 011121
  95. GRB020801, optical afterglow candidate
  96. GRB020331: Late-time Optical Light Curve (re-submission)
  97. GRB020331: Late-time Optical Light Curve
  98. IPN triangulation of GRB020714
  99. IPN triangulation of GRB150702
  100. GRB 020410: Discovery of Probable OT by HST

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