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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"

32711 results found.

  1. GRB021226
  2. GRB 021211: Probable Host and Underlying Supernova
  3. GRB 021226 registration by Helicon/Coronas-F
  4. GRB 021112: Evidence for Another Dark Optical Afterglow
  5. GRB 021219: OSN optical observations
  6. GRB021219: Radio Observations
  7. GRB021219, optical observations
  8. IPN triangulation of GRB021219 - CORRECTION
  9. IPN triangulation of GRB021219
  10. GRB021219, optical observation by MASTER
  11. GRB021219: Correction to GCN 1766
  12. VLT spectra of GRB 021211 revisited
  13. GRB021219: a long GRB localized by INTEGRAL
  14. GRB021211: APO optical observations
  15. IPN detection of continued activity from SGR1806-20
  16. XRF 020903 : HST observations
  17. GRB 021201: Optical Observations
  18. GRB 021211, optical observations
  19. GRB 021211: CTIO observations
  20. GRB021211: Measurement of Early Time Afterglow
  21. VLT spectrum of GRB 021211
  22. GRB 021211: early break in light curve
  23. GRB021211, BVRI field photometry
  24. GRB021211: Optical observations in CrAO
  25. GRB 021211, IR observations
  26. GRB 021211, optical observations
  27. GRB 021211: Optical Observations
  28. GRB021211: Kiso Observations
  29. GRB 021201, optical observations
  30. GRB 021211: Radio Observations
  31. GRB021211: Optical observations
  32. GRB 021201 (short/hard), NOT observations
  33. SUB-MM SEARCH FOR GRB 021211
  34. Chandra observation of the IPN error box of GRB021201 (short/hard)
  35. GRB 021211, R- and I-band observations
  36. GRB021211 - Upper limits from recent and historical observations
  37. GRB021211, OT at 108 s
  38. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  39. HETE 2493: Optical observations
  40. GRB 021125: Radio Observations
  41. IPN triangulation of GRB021206 (small error box)
  42. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  43. GRB021201, BVRcIc field photometry
  44. GRB 021201, Radio Observations
  45. GRB 021201: Optical Observations
  46. GRB 021201: BOOTES simultaneous optical observations
  47. GRB021004, late time optical observations
  48. GRB021004 Chandra Observation
  49. GRB021125 refined position
  50. IPN triangulation of GRB021125B (two large error boxes)
  51. IPN triangulation of GRB021119 (large error box)
  52. Improved IPN error box for GRB021125
  53. IPN BURST POSITION
  54. IPN confirmation of the reactivation of SGR1900+14
  55. GRB021113, SPI ACS observation
  56. GRB 021112: Afterglow or Variable Star?
  57. GRB021113: optical observations at Bisei
  58. GRB 021113: Evidence for a Dark Optical Afterglow
  59. GRB 021112: Variable Source in R-band search
  60. GRB021112: Optical Observations
  61. IPN triangulation of GRB021109 (portion of annulus)
  62. IPN triangulation of GRB021113 (=H2449; annulus)
  63. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  64. GRB 021113: Optical Observations
  65. GRB 021113: Optical Observations
  66. GRB021113 (=H2449): A Long GRB Localized by HETE
  67. GRB 021112: Optical Observations
  68. GRB 021112: R-band search
  69. IPN triangulation of GRB021108 (large error box)
  70. GRB021112 (=H2448): A Long GRB Localized by HETE
  71. GRB 021016: Optical Observations
  72. GRB021004: Near infrared spectroscopy
  73. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  74. Spectropolarimetry of GRB021004
  75. GRB021104: optical observations
  76. GRB021104: Candidate present in DSS
  77. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  78. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  79. IPN triangulation of GRB021025 (portion of annulus)
  80. IPN triangulation of GRB021027 (single large error box)
  81. GRB021004, late-time optical observations
  82. IPN triangulation of GRB021027 (two large error boxes)
  83. GRB 021023: Infrared Imaging
  84. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  85. IPN triangulation of SGR1900+14, October 22 2002
  86. GRB 021004: optical observations
  87. GRB021004: Optical Observations
  88. GRB 020813; likely host galaxy.
  89. IPN triangulation of GRB021020 (smaller error box)
  90. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  91. GRB 021008, radio observations
  92. GRB 021016, optical observations
  93. GRB 021004: VRI observations at TNG: possible break
  94. GRB021016, optical observations
  95. GRB 021008, optical observations
  96. GRB021016(=H2397): A Long GRB Localized by HETE
  97. IPN triangulation of GRB021016 (area corrected)
  98. IPN triangulation of GRB021016 (small error box)
  99. GRB021004: Optical Observations
  100. IPN triangulation of GRB021013 (single error box)

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