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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

35946 results found.

  1. GRB 040827 - Refined position
  2. GRB 040827 : peak flux
  3. GRB 040827 - A long GRB detected by INTEGRAL
  4. GRB040825B, BVRcIc field photometry
  5. GRB040825A, BVRcIc field photometry
  6. GCN GRB OBSERBATION REPORT
  7. GRB 040825A,optical observations
  8. Increase of SGR 1806-20 activity
  9. GRB 040825A: Optical observations.
  10. GRB040825B: Correction to GCN 2657
  11. GRB 040825: Optical observations
  12. GRB 040812: Second epoch CXO Observations
  13. GRB040823,optical observation
  14. Triangulation of GRB 040816 (Konus-Wind - Helicon-Coronas-F)
  15. XRF 040812: optical observation at VLT
  16. GRB 040812: Optical counterparts of CXO sources
  17. XRF040812: possible afterglow
  18. CXO observation of GRB 040812
  19. IPN/HETE localizations of GRB040810 (=H3489)
  20. GRB 040812: Keck and LCO optical observations
  21. GRB 040812: Keck and LCO observations
  22. GRB 040812: radio observations
  23. GRB040812, optical/IR observations
  24. Konus-Wind observation of GRB040810 (=H3489)
  25. GRB 040812: a long GRB detected by INTEGRAL
  26. GRB 040810: Optical observations of a limited region
  27. IPN/HETE triangulation of GRB040802 (=H3485)
  28. GRB 040730, infrared observations
  29. GRB 040730: Optical observations
  30. GRB 040730: a long GRB detected with INTEGRAL
  31. Ongoing activity of SGR 1806-20
  32. GRB040624: optical monitoring at TNG
  33. Cancellation of IBAS/INTEGRAL GRB alerts
  34. IBAS Alert 1836: NOT a real GRB
  35. GRB040709 J,H-band observations
  36. GRB 040624: optical observations
  37. GRB 040624: optical observations at TNG and VLT
  38. MASTER: GRB 040624 optical observation after 0,48d
  39. GRB 040624: R-band observations
  40. GRB 040624, optical observations
  41. GRB 040624 - A long GRB detected with INTEGRAL
  42. GRB 030329: Rebrightening of hyperluminal ejecta.
  43. IPN Summary of SGR1806-20 Activity in 2004
  44. GRB040511: Retraction of redshift identification
  45. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  46. GRB 040606: Optical observations
  47. MASTER: HETE Alert 3274 optical observation
  48. Activivty of SGR 1806-20
  49. IPN triangulation of an intense intermediate burst from SGR1806-20
  50. GRB 040511, very fast decay?
  51. GRB 030324: Detection and Color of Host Galaxy
  52. GRB 040511: NIR observations with REM
  53. GRB040511: Redshift identifcation
  54. GRB 040511: Optical limit
  55. IBAS GRB Alerts n.1785 to 1791
  56. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  57. GRB 040511: Second Epoch Optical Observations
  58. IBAS GRB Alerts 1781-4
  59. GRB 040511: Optical observations
  60. GRB 040511: Optical Observations
  61. GRB040511: Optical Observations
  62. GRB040511: Optical Observations
  63. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  64. IBAS GRB Alert number 1774: NOT a real GRB
  65. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  66. IBAS Alerts 1771 and 1772: NOT a real GRB
  67. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  68. IPN triangulation of GRB040425 (=H3183)
  69. GRB040422: optical observations at CrAO
  70. GRB 040423 (=H3175): A Long GRB Localized by HETE
  71. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  72. GRB040422, BVRcIc field calibration
  73. GRB 040422,optical observation
  74. GRB 040422: a long GRB detected with INTEGRAL
  75. GRB 040403, deep optical observations
  76. INTEGRAL-SPI/ACS GRB data: timing correction
  77. IBAS GRB alerts 1739, 1740, 1741
  78. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  79. GRB 040403: Optical Observations
  80. GRB 040403 Optical Observations
  81. GRB 040403: Optical observations
  82. GRB 040403: optical observations
  83. GRB 040403: Optical Observations
  84. GRB 040403: a long GRB detected with INTEGRAL
  85. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  86. IBAS GRB Alert 1694
  87. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  88. GRB 040323, a dark GRB ?
  89. short hard GRB 040322
  90. GRB 040323: a long GRB detected with INTEGRAL
  91. IBAS GRB alerts 1679, 1680, 1681
  92. GRB040223: Deep NIR NTT data re-analysis
  93. GRB 040223: XMM-Newton results
  94. GRB040223, improved XMM position
  95. IBAS Alert 1678: not a GRB
  96. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  97. GRB 031203, possible supernova
  98. GRB 040228 Optical observations
  99. IPN triangulation of GRB040228 (H3066, H3067)
  100. GRB040228 : KISO optical follow-up observation

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