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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"

28100 results found.

  1. GRB041211: RAPTOR observations
  2. GRB041211: Ashra Prototype optical observation
  3. GRB041211, BVRcIc field calibration
  4. GRB041211,optical observation
  5. GRB 041211: Infrared Observations
  6. GRB 041211: KAIT observations
  7. GRB 041211: Optical follow-up in East Asian region
  8. Triangulation of short GRB 041116 (large error box)
  9. GRB 040924: Afterglow Color
  10. GRB 041006: GETS Optical Afterglow Observation
  11. Summary of the recent bursts from SGR 1806-20
  12. GRB 041006: Optical Observations
  13. GRB041006, late-time optical photometry
  14. GRB041006: RTT150 Optical Observations
  15. HST Observations: XRF 040701 and 040812
  16. Bright bursts from SGR1806-20
  17. GRB 041016: BOOTES-2 simultaneous observation
  18. GRB041006: RTT150 Optical Observations
  19. GRB041016,optical observation
  20. GRB 041016: Optical limits
  21. GRB 041016:Optical limit during first minute
  22. GRB 041015: Optical Observations at Rikubetsu
  23. GRB 041016: Optical limit
  24. GRB 041015 R band observations
  25. GRB040924, BVRcIc field calibration
  26. GRB041015,optical observation
  27. GRB041006: Fading X-ray Afterglow Observed with Chandra
  28. GRB 041015 - A long GRB detected by INTEGRAL
  29. GRB041006: VLT observations of the afterglow and host galaxy
  30. GRB041006: Optical observations and Potential host galaxy
  31. GRB041006, BVRcIc field calibration
  32. GRB 040924: VLT spectroscopy
  33. GRB 041006: SARA afterglow observations
  34. GRB041006, optical observation in CrAO
  35. Search for SN light in XRF 040912 with MEGACAM
  36. GRB 041006: BR observations with VATT
  37. GRB 041006: Redshift confirmed
  38. GRB 041006: Radio Observations
  39. GRB 041006 : optical follow-up observation at Lulin Observatory
  40. GRB041006: Optical photometry and spectroscopy at TNG
  41. GRB 041006: presice astrometry
  42. GRB041006, optical I observation
  43. GRB041006 (=HETE3570): optical observations
  44. ROTSE-IIIa Observations of GRB 041006
  45. GRB041006: MASTER optical observations
  46. GRB041006,optical observation
  47. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  48. GRB041006: Fading of optical afterglow candidate
  49. GRB 041006: Optical afterglow candidate
  50. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  51. XRF 020903: Observations of the Host Galaxy
  52. radio observations, GRB 040924
  53. GRB040929,optical observation
  54. GRB040924,optical observation
  55. GRB040924,optical observation
  56. GRB 040924: detection of possible host galaxy by Subaru
  57. GRB040924: KAIT observations
  58. GRB040924 : Optical candidate observations at Lulin observatory
  59. GRB040924 : Optical candidate observations at Lulin observatory
  60. GRB 040924: Subaru NIR observation
  61. XRF 040912: Radio Observations
  62. XRF 040916: Radio Observations
  63. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  64. XRF040916: continuing decay of OT
  65. TAROT Observations of GRB 040916 (HETE #3558)
  66. GRB040912(=H3557): Candidate Optical Afterglow
  67. XRF040916, optical observations
  68. XRF 040912, identification of CXO sources
  69. XRF040912, BVRcIc field calibration
  70. XRF040916, BVRcIc field calibration
  71. GRB040916: Archival optical observations
  72. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  73. GRB040916: Optical observations
  74. GRB040912 (= H3557): Chandra Observations Scheduled
  75. GRB 040912: Optical Observations
  76. GRB/XRF040912,optical observations
  77. GRB 040912, BVRI observations
  78. Optical observations of field of GRB040912
  79. HETE 3557: Optical observations
  80. GRB040903 - A XRF?
  81. GRB040827: analysis of the XMM-Newton observation
  82. GRB040903, REM near-IR observation
  83. Very bright burst detected from SGR 1806-20
  84. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  85. Possible GRB 040903 - further analysis
  86. GRB 040827 - Radio Observations
  87. XMM-Newton Images of GRB 040827
  88. GRB 040827: optical and NIR observations at the VLT
  89. GRB 040827: UKIRT - 2nd epoch K-band imaging
  90. GRB 040827: 2nd epoch of Magellan K-band imaging
  91. GRB 040827: K imaging - no evidence of variability
  92. GRB 040827: Detection of NIR afterglow
  93. GRB040827 XMM-Newton observation
  94. GRB040825A: optical limit before GRB
  95. GRB 040825B: Optical observations
  96. GRB 040827 : Planned XMM-Newton observation
  97. GRB040825B, BVRcIc field photometry
  98. GRB040825A, BVRcIc field photometry
  99. GCN GRB OBSERBATION REPORT
  100. GRB 040825A,optical observations

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