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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"

37167 results found.

  1. TAROT Observations of GRB 040916 (HETE #3558)
  2. XRF040916, optical observations
  3. XRF040916: Optical Transient Candidate by Subaru
  4. GRB040916 optical limits 17 min after GRB
  5. XRF 040912 (=H3557): Spectral and Temporal Properties
  6. XRF040916, Ic observations
  7. XRF040912, BVRcIc field calibration
  8. XRF040916, BVRcIc field calibration
  9. GRB040916: Archival optical observations
  10. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  11. GRB040916: Optical observations
  12. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  13. GRB040912 (= H3557): Chandra Observations Scheduled
  14. GRB 040912: Optical Observations
  15. GRB/XRF040912,optical observations
  16. GRB 040912, BVRI observations
  17. Optical observations of GRB/XRF 040912 = HETE 3557
  18. An intense burst from SGR1806-20
  19. IBAS GRB Alerts 1978-1980
  20. Optical observations of field of GRB040912
  21. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  22. GRB 040827: XMM-Newton data
  23. GRB040903 - A XRF?
  24. GRB040827: analysis of the XMM-Newton observation
  25. GRB040903, REM near-IR observation
  26. GRB 040903 - INTEGRAL data analysis
  27. IBAS Alert 1974. Not a real GRB
  28. Very bright burst detected from SGR 1806-20
  29. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  30. Possible GRB 040903 - further analysis
  31. Possible GRB 040903 detected with INTEGRAL
  32. GRB 040827 - Radio Observations
  33. XMM-Newton Images of GRB 040827
  34. GRB 040827: optical and NIR observations at the VLT
  35. GRB 040827: UKIRT - 2nd epoch K-band imaging
  36. GRB 040827: 2nd epoch of Magellan K-band imaging
  37. GRB 040827: K imaging - no evidence of variability
  38. GRB 040827: Detection of NIR afterglow
  39. GRB 040827: Possible detection of optical afterglow
  40. GRB 040827: RTT150 optical observations
  41. GRB040825A: optical limit before GRB
  42. MASTER: GRB040827 possible OT
  43. GRB 040825B: Optical observations
  44. GRB040827 optical observations
  45. GRB 040827 : Planned XMM-Newton observation
  46. GRB 040827 - Refined position
  47. GRB 040827 : peak flux
  48. GRB 040827 - A long GRB detected by INTEGRAL
  49. GRB040825B, BVRcIc field photometry
  50. GRB040825A, BVRcIc field photometry
  51. GCN GRB OBSERBATION REPORT
  52. GRB 040825A,optical observations
  53. Increase of SGR 1806-20 activity
  54. GRB 040825A: Optical observations.
  55. MASTER: GRB040825b optical observation
  56. GRB040825B: Correction to GCN 2657
  57. GRB 040825: Optical observations
  58. XRF040812: possible afterglow second Chandra observation
  59. GRB 040812: Second epoch CXO Observations
  60. GRB040823,optical observation
  61. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  62. XRF 040812: optical observation at VLT
  63. GRB 040812: Optical counterparts of CXO sources
  64. XRF040812: possible afterglow
  65. CXO observation of GRB 040812
  66. IPN/HETE localizations of GRB040810 (=H3489)
  67. GRB 040812: Keck and LCO optical observations
  68. GRB 040812: Keck and LCO observations
  69. GRB 040812: radio observations
  70. GRB040812, optical/IR observations
  71. Konus-Wind observation of GRB040810 (=H3489)
  72. GRB 040812: a long GRB detected by INTEGRAL
  73. GRB 040810: Optical observations of a limited region
  74. IPN/HETE triangulation of GRB040802 (=H3485)
  75. GRB 040730, infrared observations
  76. GRB 040730: Optical observations
  77. GRB 040730: a long GRB detected with INTEGRAL
  78. Ongoing activity of SGR 1806-20
  79. GRB040624: optical monitoring at TNG
  80. XRF 040701 - optical observations of the decaying Chandra source
  81. XRF040701: Second-Epoch Chandra Observations
  82. Cancellation of IBAS/INTEGRAL GRB alerts
  83. XRF040701: First-Epoch Chandra Observations
  84. IBAS Alert 1836: NOT a real GRB
  85. GRB040709 J,H-band observations
  86. XRF 040701, optical observations
  87. GRB 040624: optical observations
  88. Optical Observations of GRB040624
  89. GRB 040624: optical observations at TNG and VLT
  90. MASTER: GRB 040624 optical observation after 0,48d
  91. GRB 040624: R-band observations
  92. GRB 040624, optical observations
  93. GRB 040624 - A long GRB detected with INTEGRAL
  94. GRB 030329: Rebrightening of hyperluminal ejecta.
  95. IPN Summary of SGR1806-20 Activity in 2004
  96. GRB040511: Retraction of redshift identification
  97. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  98. GRB 040606: Optical observations
  99. MASTER: HETE Alert 3274 optical observation
  100. Activivty of SGR 1806-20

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