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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"

32682 results found.

  1. GRB 021211: Radio Observations
  2. GRB021211: Optical observations
  3. GRB 021201 (short/hard), NOT observations
  4. SUB-MM SEARCH FOR GRB 021211
  5. Chandra observation of the IPN error box of GRB021201 (short/hard)
  6. GRB 021211, R- and I-band observations
  7. GRB021211 - Upper limits from recent and historical observations
  8. GRB021211, OT at 108 s
  9. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  10. HETE 2493: Optical observations
  11. GRB 021125: Radio Observations
  12. IPN triangulation of GRB021206 (small error box)
  13. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  14. GRB021201, BVRcIc field photometry
  15. GRB 021201, Radio Observations
  16. GRB 021201: Optical Observations
  17. GRB 021201: BOOTES simultaneous optical observations
  18. GRB021004, late time optical observations
  19. GRB021004 Chandra Observation
  20. GRB021125 refined position
  21. IPN triangulation of GRB021125B (two large error boxes)
  22. IPN triangulation of GRB021119 (large error box)
  23. Improved IPN error box for GRB021125
  24. IPN BURST POSITION
  25. IPN confirmation of the reactivation of SGR1900+14
  26. GRB021113, SPI ACS observation
  27. GRB 021112: Afterglow or Variable Star?
  28. GRB021113: optical observations at Bisei
  29. GRB 021113: Evidence for a Dark Optical Afterglow
  30. GRB 021112: Variable Source in R-band search
  31. GRB021112: Optical Observations
  32. IPN triangulation of GRB021109 (portion of annulus)
  33. IPN triangulation of GRB021113 (=H2449; annulus)
  34. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  35. GRB 021113: Optical Observations
  36. GRB 021113: Optical Observations
  37. GRB021113 (=H2449): A Long GRB Localized by HETE
  38. GRB 021112: Optical Observations
  39. GRB 021112: R-band search
  40. IPN triangulation of GRB021108 (large error box)
  41. GRB021112 (=H2448): A Long GRB Localized by HETE
  42. GRB 021016: Optical Observations
  43. GRB021004: Near infrared spectroscopy
  44. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  45. Spectropolarimetry of GRB021004
  46. GRB021104: optical observations
  47. GRB021104: Candidate present in DSS
  48. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  49. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  50. IPN triangulation of GRB021025 (portion of annulus)
  51. IPN triangulation of GRB021027 (single large error box)
  52. GRB021004, late-time optical observations
  53. IPN triangulation of GRB021027 (two large error boxes)
  54. GRB 021023: Infrared Imaging
  55. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  56. IPN triangulation of SGR1900+14, October 22 2002
  57. GRB 021004: optical observations
  58. GRB021004: Optical Observations
  59. GRB 020813; likely host galaxy.
  60. IPN triangulation of GRB021020 (smaller error box)
  61. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  62. GRB 021008, radio observations
  63. GRB 021016, optical observations
  64. GRB 021004: VRI observations at TNG: possible break
  65. GRB021016, optical observations
  66. GRB 021008, optical observations
  67. GRB021016(=H2397): A Long GRB Localized by HETE
  68. IPN triangulation of GRB021016 (area corrected)
  69. IPN triangulation of GRB021016 (small error box)
  70. GRB021004: Optical Observations
  71. IPN triangulation of GRB021013 (single error box)
  72. GRB 021004: optical spectroscopy on Oct 11
  73. IPN triangulation of GRB021013 (two small error boxes)
  74. GRB021004: High-resolution optical spectroscopy
  75. XRF 020903: flattening of the optical light curve.
  76. GRB021004, UBVRcIc field photometry update
  77. IPN triangulation of GRB021008 (single error box)
  78. GRB021004: Optical Observations
  79. GRB 021004 submm observations
  80. IPN triangulation of GRB021008 (two small error boxes)
  81. GRB 021004: Optical/NIR Observations
  82. GRB 021004: Additional V-band Polarimetric Observations
  83. GRB021004: optical observation
  84. GRB 021004: Host Galaxy Star Formation Rate
  85. GRB 021004 submm observations
  86. GRB 021004: WC wind?
  87. GRB021004: NIR and Optical observations
  88. GRB 021004: Optical measurement at OHP
  89. GRB 021004: Optical observations, AUDE network
  90. GRB 021004 - VLA Radio Observations
  91. GRB 021004 - Unusual Radio-to-Submm Spectrum
  92. XRF 020903 spectrum
  93. GRB021004: optical observations and predicted break time
  94. GRB021004: BVRc photometry
  95. GRB 021004 redshift
  96. GRB021004: restart of optical decay
  97. GRB 021004: Optical Decay
  98. GRB 021004, spectroscopic observations
  99. GRB021004: not fading anymore?
  100. GRB 021004: Optical Photometry at 2.5 Days

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