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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"

27289 results found.

  1. Konus-Wind detection of the bursts from SGR1806-20 region
  2. IPN detection of renewed activity from SGR1806-20
  3. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  4. HETE detection of burst from SGR1806-20
  5. GRB 021206, Radio afterglow candidate
  6. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  7. GRB030501 localized by INTEGRAL
  8. GRB030329 observed as a sudden ionospheric disturbance (SID)
  9. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  10. OT GRB 030329: early spectrum
  11. GRB 030329 VLBA Observations
  12. GRB 030329: Sub-millimeter detection
  13. GRB 030329: Radio observations at GMRT
  14. GRB030329a: detection by Konus-Wind
  15. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  16. RXTE detection of GRB 030329 afterglow
  17. Possible GRB030323 localized by INTEGRAL
  18. GRB030323: Detection on 2003/03/24
  19. VLT/FORS2 spectra of GRB 030323
  20. GRB030323, ROTSE-III detection of possible optical counterpart
  21. Possible GRB 030320 localized by INTEGRAL
  22. GRB030226: Analysis of Chandra data
  23. Chandra detection of the X-ray afterglow of GRB 030226
  24. GRB 030228, optical observations
  25. GRB030227 localized by INTEGRAL
  26. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  27. GRB 030217: Optical Observations at 4, 5, and 6 Days
  28. GRB030115, WSRT radio observations - correction to GCN 1864
  29. GRB 030131: marginal optical detection
  30. GRB030115, WSRT radio observations
  31. A long GRB detected by INTEGRAL
  32. GRB 030115: Radio detection of IR candidate
  33. GRB 030115: IR observations with IRSF/SIRIUS
  34. GRB030115: R-band counterpart of IR candidate
  35. GRB030115: TAROT optical observations
  36. GRB 030115, optical candidate
  37. GRB 021112: Evidence for Another Dark Optical Afterglow
  38. GRB021219: a long GRB localized by INTEGRAL
  39. IPN detection of continued activity from SGR1806-20
  40. GRB 021211, optical observations
  41. GRB021211: Measurement of Early Time Afterglow
  42. IPN detection of renewed activity from SGR1806-20
  43. IPN detection of continued SGR1900+14 activity
  44. GRB021125 : A long GRB localized by INTEGRAL
  45. IPN detection of possible reactivation of SGR1900+14
  46. GRB 021113: Evidence for a Dark Optical Afterglow
  47. Detection of activity from SGR 1900+14 with the RXTE/PCA
  48. GRB 020813; likely host galaxy.
  49. GRB 021008, optical observations
  50. GRB 021004: optical spectroscopy on Oct 11
  51. GRB021004: optical observation
  52. GRB 021004: WC wind?
  53. GRB 021004: Optical observations, AUDE network
  54. GRB 021004: optical spectroscopy
  55. IRAM Millimeter detection of GRB 021004
  56. GRB 021004 radio search
  57. XRF 020903: optical observation at Kyoto
  58. GRB020322 : HST/STIS observations
  59. IPN detection of a burst from SGR1900+14
  60. XRF 020903, optical observations
  61. Confirming no variability for GRB02081
  62. GRB020813: Early Time Magnitude
  63. GRB 020813, radio detection
  64. GRB020812: optical observations
  65. GRB 020813 multiband optical observations
  66. HST Imaging of the Host of GRB 011121
  67. GRB 020410: Discovery of Probable OT by HST
  68. GRB 020625, optical observations
  69. GRB/XRF 020427, detection of an underlying system with the VLT
  70. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  71. AXP 1E2259+586: quasi-simultaneous optical observation
  72. AXP 1E2259+586 optical observations
  73. GRB 020531, simultaneous optical observations
  74. GRB020531: Detection of Candidate Host Galaxy
  75. GRB020531: Upper Limit for Detection of Two TAROT Sources
  76. IPN detection of possible bursts from SGR1806-20
  77. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  78. HST detection of the likely host galaxy of GRB 020124
  79. The end of BSAX GRB activities
  80. GRB 020124: Optical observations
  81. GRB020410: BeppoSAX NFI observations refined analysis
  82. Mars Odyssey joins the IPN
  83. GRB020405: predicted break
  84. GRB 020409, No Optical Detection to R = 22
  85. GRB 020331 Kyoto observation on March 31
  86. GRB 020409
  87. GRB 020409, No Optical Detection to R = 20
  88. X-ray afterglow of GRB020321
  89. ASM GRB candidate 020406 refined error box
  90. GRB020331: Optical Observations of Afterglow Candidate
  91. GRB020406(?), optical observations
  92. GRB 020405, U-band observations
  93. GRB011212: Optical Observations
  94. GRB 020322: Optical Observations
  95. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  96. GRB 020322 optical observation
  97. GRB020322, optical observations
  98. GRB020321: BeppoSAX/NFI Observations
  99. GRB020321: a faint BeppoSAX detection
  100. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB

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