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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"

28234 results found.

  1. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  2. GRB 030115, simultaneous observations by BOOTES-1
  3. GRB 030115: IR observations with IRSF/SIRIUS
  4. IPN triangulation of GRB030115C (large error box)
  5. GRB030115, afterglow candidate
  6. GRB 021211: R-band observations at late-time
  7. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  8. GRB 030115 : Possible IR counterpart
  9. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  10. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  11. GRB 030115: APO Optical Observations
  12. Information about where HETE will be pointing
  13. VLT spectroscopy of the probable host of GRB 021211
  14. IPN triangulation of GRB030101 (two large error boxes)
  15. GRB 021211: Probable Host and Underlying Supernova
  16. GRB 021112: Evidence for Another Dark Optical Afterglow
  17. GRB 021219: OSN optical observations
  18. GRB021219, optical observations
  19. GRB021219, optical observation by MASTER
  20. VLT spectra of GRB 021211 revisited
  21. GRB021219: a long GRB localized by INTEGRAL
  22. GRB021211: APO optical observations
  23. XRF 020903 : HST observations
  24. GRB 021201: Optical Observations
  25. GRB 021211: CTIO observations
  26. GRB021211, BVRI field photometry
  27. GRB021211: Optical observations in CrAO
  28. GRB 021211, optical observations
  29. GRB021211: Kiso Observations
  30. GRB 021201, optical 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 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  38. IPN triangulation of GRB021206 (small error box)
  39. IPN triangulation of GRB021205 (large error box)
  40. GRB021201, BVRcIc field photometry
  41. GRB 021201: BOOTES simultaneous optical observations
  42. IPN triangulation of GRB021201 (short/hard burst, small error box)
  43. GRB021004, late time optical observations
  44. GRB021004 Chandra Observation
  45. IPN detection of continued SGR1900+14 activity
  46. Improved IPN error box for GRB021125
  47. IPN BURST POSITION
  48. IPN triangulation of GRB021125 (INTEGRAL BURST)
  49. GRB021125 : A long GRB localized by INTEGRAL
  50. IPN confirmation of the reactivation of SGR1900+14
  51. GRB021113, SPI ACS observation
  52. GRB 021112: Afterglow or Variable Star?
  53. GRB021113: optical observations at Bisei
  54. GRB 021113: Evidence for a Dark Optical Afterglow
  55. GRB021112, BVRI field photometry
  56. GRB 021112: Variable Source in R-band search
  57. GRB021112: Optical Observations
  58. IPN triangulation of GRB021113 (=H2449; annulus)
  59. GRB 021113: Optical observations
  60. GRB 021112: RAPTOR Observations
  61. GRB021113 (=H2449): A Long GRB Localized by HETE
  62. GRB021112 (=H2448): A Long GRB Localized by HETE
  63. GRB 021016: Optical Observations
  64. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  65. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  66. SGR1900+14 activity, November 2-4, 2002
  67. GRB021104: optical observations
  68. Detection of activity from SGR 1900+14 with the RXTE/PCA
  69. IPN triangulation of GRB021027 (single large error box)
  70. IPN triangulation of GRB021027 (two large error boxes)
  71. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  72. GRB 021004: optical observations
  73. IPN triangulation of GRB021023 (small error boc)
  74. GRB 020813; likely host galaxy.
  75. IPN triangulation of GRB021020 (smaller error box)
  76. IPN triangulation of GRB021020
  77. GRB 021008, optical observations
  78. IPN triangulation of GRB021016 (small error box)
  79. IPN triangulation of GRB021014 (large error box)
  80. IPN triangulation of GRB021013 (single error box)
  81. GRB 021004: optical spectroscopy on Oct 11
  82. IPN triangulation of GRB021013 (two small error boxes)
  83. GRB021004: High-resolution optical spectroscopy
  84. XRF 020903: flattening of the optical light curve.
  85. GRB021004, UBVRcIc field photometry update
  86. IPN triangulation of GRB021008 (single error box)
  87. GRB 021004 submm observations
  88. IPN triangulation of GRB021008 (two small error boxes)
  89. GRB021004 Chandra HETG Observations
  90. GRB 021004: Optical/NIR Observations
  91. GRB 021004: Additional V-band Polarimetric Observations
  92. GRB021004: optical observation
  93. GRB 021004: Host Galaxy Star Formation Rate
  94. GRB 021004 submm observations
  95. GRB 021004: WC wind?
  96. GRB021004: NIR and Optical observations
  97. GRB 021004: Optical observations, AUDE network
  98. GRB 021004 - VLA Radio Observations
  99. GRB 021004 - Unusual Radio-to-Submm Spectrum
  100. GRB 021004: optical spectroscopy

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