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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"

32598 results found.

  1. GRB021211: APO optical observations
  2. IPN detection of continued activity from SGR1806-20
  3. XRF 020903 : HST observations
  4. GRB 021201: Optical Observations
  5. GRB 021211, optical observations
  6. GRB 021211: CTIO observations
  7. GRB021211: Measurement of Early Time Afterglow
  8. VLT spectrum of GRB 021211
  9. GRB 021211: early break in light curve
  10. GRB021211, BVRI field photometry
  11. GRB021211: Optical observations in CrAO
  12. GRB 021211, IR observations
  13. GRB 021211, optical observations
  14. GRB 021211: Optical Observations
  15. GRB021211: Kiso Observations
  16. GRB 021201, optical observations
  17. GRB 021211: Radio Observations
  18. GRB021211: Optical observations
  19. GRB 021201 (short/hard), NOT observations
  20. SUB-MM SEARCH FOR GRB 021211
  21. Chandra observation of the IPN error box of GRB021201 (short/hard)
  22. GRB 021211, R- and I-band observations
  23. GRB021211 - Upper limits from recent and historical observations
  24. GRB021211, OT at 108 s
  25. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  26. HETE 2493: Optical observations
  27. GRB 021125: Radio Observations
  28. IPN triangulation of GRB021206 (small error box)
  29. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  30. GRB021201, BVRcIc field photometry
  31. GRB 021201, Radio Observations
  32. GRB 021201: Optical Observations
  33. GRB 021201: BOOTES simultaneous optical observations
  34. GRB021004, late time optical observations
  35. GRB021004 Chandra Observation
  36. GRB021125 refined position
  37. IPN triangulation of GRB021125B (two large error boxes)
  38. IPN triangulation of GRB021119 (large error box)
  39. Improved IPN error box for GRB021125
  40. IPN BURST POSITION
  41. IPN confirmation of the reactivation of SGR1900+14
  42. GRB021113, SPI ACS observation
  43. GRB 021112: Afterglow or Variable Star?
  44. GRB021113: optical observations at Bisei
  45. GRB 021113: Evidence for a Dark Optical Afterglow
  46. GRB 021112: Variable Source in R-band search
  47. GRB021112: Optical Observations
  48. IPN triangulation of GRB021109 (portion of annulus)
  49. IPN triangulation of GRB021113 (=H2449; annulus)
  50. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  51. GRB 021113: Optical Observations
  52. GRB 021113: Optical Observations
  53. GRB021113 (=H2449): A Long GRB Localized by HETE
  54. GRB 021112: Optical Observations
  55. GRB 021112: R-band search
  56. IPN triangulation of GRB021108 (large error box)
  57. GRB021112 (=H2448): A Long GRB Localized by HETE
  58. GRB 021016: Optical Observations
  59. GRB021004: Near infrared spectroscopy
  60. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  61. Spectropolarimetry of GRB021004
  62. GRB021104: optical observations
  63. GRB021104: Candidate present in DSS
  64. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  65. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  66. IPN triangulation of GRB021025 (portion of annulus)
  67. IPN triangulation of GRB021027 (single large error box)
  68. GRB021004, late-time optical observations
  69. IPN triangulation of GRB021027 (two large error boxes)
  70. GRB 021023: Infrared Imaging
  71. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  72. IPN triangulation of SGR1900+14, October 22 2002
  73. GRB 021004: optical observations
  74. GRB021004: Optical Observations
  75. GRB 020813; likely host galaxy.
  76. IPN triangulation of GRB021020 (smaller error box)
  77. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  78. GRB 021008, radio observations
  79. GRB 021016, optical observations
  80. GRB 021004: VRI observations at TNG: possible break
  81. GRB021016, optical observations
  82. GRB 021008, optical observations
  83. GRB021016(=H2397): A Long GRB Localized by HETE
  84. IPN triangulation of GRB021016 (area corrected)
  85. IPN triangulation of GRB021016 (small error box)
  86. GRB021004: Optical Observations
  87. IPN triangulation of GRB021013 (single error box)
  88. GRB 021004: optical spectroscopy on Oct 11
  89. IPN triangulation of GRB021013 (two small error boxes)
  90. GRB021004: High-resolution optical spectroscopy
  91. XRF 020903: flattening of the optical light curve.
  92. GRB021004, UBVRcIc field photometry update
  93. IPN triangulation of GRB021008 (single error box)
  94. GRB021004: Optical Observations
  95. GRB 021004 submm observations
  96. IPN triangulation of GRB021008 (two small error boxes)
  97. GRB 021004: Optical/NIR Observations
  98. GRB 021004: Additional V-band Polarimetric Observations
  99. GRB021004: optical observation
  100. GRB 021004: Host Galaxy Star Formation Rate

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