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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"

28239 results found.

  1. GRB 020819: Host galaxy at Radio Position
  2. IPN triangulation of GRB030131
  3. GRB 030131 optical observations
  4. GRB 030131 optical observations
  5. A long GRB detected by INTEGRAL
  6. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  7. GRB 030115, simultaneous observations by BOOTES-1
  8. GRB 030115: IR observations with IRSF/SIRIUS
  9. IPN triangulation of GRB030115C (large error box)
  10. GRB030115, afterglow candidate
  11. GRB 021211: R-band observations at late-time
  12. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  13. GRB 030115 : Possible IR counterpart
  14. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  15. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  16. GRB 030115: APO Optical Observations
  17. Information about where HETE will be pointing
  18. VLT spectroscopy of the probable host of GRB 021211
  19. IPN triangulation of GRB030101 (two large error boxes)
  20. GRB 021211: Probable Host and Underlying Supernova
  21. GRB 021112: Evidence for Another Dark Optical Afterglow
  22. GRB 021219: OSN optical observations
  23. GRB021219, optical observations
  24. GRB021219, optical observation by MASTER
  25. VLT spectra of GRB 021211 revisited
  26. GRB021219: a long GRB localized by INTEGRAL
  27. GRB021211: APO optical observations
  28. XRF 020903 : HST observations
  29. GRB 021201: Optical Observations
  30. GRB 021211: CTIO observations
  31. GRB021211, BVRI field photometry
  32. GRB021211: Optical observations in CrAO
  33. GRB 021211, optical observations
  34. GRB021211: Kiso Observations
  35. GRB 021201, optical observations
  36. GRB021211: Optical observations
  37. GRB 021201 (short/hard), NOT observations
  38. SUB-MM SEARCH FOR GRB 021211
  39. Chandra observation of the IPN error box of GRB021201 (short/hard)
  40. GRB 021211, R- and I-band observations
  41. GRB021211 - Upper limits from recent and historical observations
  42. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  43. IPN triangulation of GRB021206 (small error box)
  44. IPN triangulation of GRB021205 (large error box)
  45. GRB021201, BVRcIc field photometry
  46. GRB 021201: BOOTES simultaneous optical observations
  47. IPN triangulation of GRB021201 (short/hard burst, small error box)
  48. GRB021004, late time optical observations
  49. GRB021004 Chandra Observation
  50. IPN detection of continued SGR1900+14 activity
  51. Improved IPN error box for GRB021125
  52. IPN BURST POSITION
  53. IPN triangulation of GRB021125 (INTEGRAL BURST)
  54. GRB021125 : A long GRB localized by INTEGRAL
  55. IPN confirmation of the reactivation of SGR1900+14
  56. GRB021113, SPI ACS observation
  57. GRB 021112: Afterglow or Variable Star?
  58. GRB021113: optical observations at Bisei
  59. GRB 021113: Evidence for a Dark Optical Afterglow
  60. GRB021112, BVRI field photometry
  61. GRB 021112: Variable Source in R-band search
  62. GRB021112: Optical Observations
  63. IPN triangulation of GRB021113 (=H2449; annulus)
  64. GRB 021113: Optical observations
  65. GRB 021112: RAPTOR Observations
  66. GRB021113 (=H2449): A Long GRB Localized by HETE
  67. GRB021112 (=H2448): A Long GRB Localized by HETE
  68. GRB 021016: Optical Observations
  69. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  70. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  71. SGR1900+14 activity, November 2-4, 2002
  72. GRB021104: optical observations
  73. Detection of activity from SGR 1900+14 with the RXTE/PCA
  74. IPN triangulation of GRB021027 (single large error box)
  75. IPN triangulation of GRB021027 (two large error boxes)
  76. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  77. GRB 021004: optical observations
  78. IPN triangulation of GRB021023 (small error boc)
  79. GRB 020813; likely host galaxy.
  80. IPN triangulation of GRB021020 (smaller error box)
  81. IPN triangulation of GRB021020
  82. GRB 021008, optical observations
  83. IPN triangulation of GRB021016 (small error box)
  84. IPN triangulation of GRB021014 (large error box)
  85. IPN triangulation of GRB021013 (single error box)
  86. GRB 021004: optical spectroscopy on Oct 11
  87. IPN triangulation of GRB021013 (two small error boxes)
  88. GRB021004: High-resolution optical spectroscopy
  89. XRF 020903: flattening of the optical light curve.
  90. GRB021004, UBVRcIc field photometry update
  91. IPN triangulation of GRB021008 (single error box)
  92. GRB 021004 submm observations
  93. IPN triangulation of GRB021008 (two small error boxes)
  94. GRB021004 Chandra HETG Observations
  95. GRB 021004: Optical/NIR Observations
  96. GRB 021004: Additional V-band Polarimetric Observations
  97. GRB021004: optical observation
  98. GRB 021004: Host Galaxy Star Formation Rate
  99. GRB 021004 submm observations
  100. GRB 021004: WC wind?

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